CN117559472A - Power grid frequency adjustment method, device, equipment and readable storage medium - Google Patents
Power grid frequency adjustment method, device, equipment and readable storage medium Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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Abstract
The application discloses a power grid frequency adjustment method, a device, equipment and a readable storage medium, comprising the following steps: acquiring the original frequency of a power grid; determining a control mode of the power grid according to the original frequency; if the control mode of the power grid is an inertia response mode, calculating to obtain actual frequency modulation power of the power grid according to the original frequency, wherein the actual frequency modulation power is determined according to the secondary change rate of the original frequency, and the secondary change rate of the original frequency is used for representing the change speed of the change rate of the original frequency; and adjusting the frequency of the power grid according to the actual frequency modulation power. According to the method and the device, under the condition that the control mode of the power grid is the inertia response mode, the actual frequency modulation power is calculated according to the secondary change rate of the original frequency of the power grid, and the power grid is subjected to frequency adjustment according to the actual frequency modulation power, namely, the change speed of the change rate of the original frequency of the power grid is considered during the power grid frequency adjustment, so that the power grid frequency can be adjusted more accurately, and the accuracy of the power grid frequency adjustment is improved.
Description
Technical Field
The present disclosure relates to the field of power systems, and more particularly, to a method, apparatus, device, and readable storage medium for grid frequency adjustment.
Background
The construction of new power systems using new energy as main body is being accelerated in China. Gradually reducing fossil energy use, new energy is being developed on a larger scale. In this context, the proportion of synchronous units with rotational kinetic energy reserves will be significantly reduced, and new energy will be connected to the power system in a higher proportion. However, new energy sources such as wind power and photovoltaic which are controlled conventionally cannot provide frequency support such as inertia and primary frequency modulation like a traditional synchronous generator set, and the new energy sources can deteriorate frequency dynamics of a system under power disturbance after replacing the traditional synchronous generator set. This can lead to a power system with continuously weakening of the equivalent inertia and a deterioration of the ability to resist frequency disturbances, leading to potentially severe frequency accidents, and therefore, a need for timely frequency adjustment to improve the stability of the power system when disturbances occur in the frequency of the power system.
However, the current power grid frequency adjustment method is usually adjusted based on the change rate of the power grid frequency, so that the accuracy is low, and the stability of the power grid cannot be further improved.
Disclosure of Invention
The embodiment of the application provides a power grid frequency adjustment method, a device, equipment and a readable storage medium, which can improve the accuracy of power grid frequency adjustment and further improve the stability of a power grid.
In view of this, an embodiment of the present application provides a method for adjusting a power grid frequency, the method including:
acquiring the original frequency of a power grid;
determining a control mode of a power grid according to the original frequency;
if the control mode of the power grid is an inertia response mode, calculating to obtain actual frequency modulation power of the power grid according to the original frequency, wherein the actual frequency modulation power is determined according to the secondary change rate of the original frequency, and the secondary change rate of the original frequency is used for representing the change speed of the change rate of the original frequency;
and carrying out frequency adjustment on the power grid according to the actual frequency modulation power.
Optionally, the calculating to obtain the actual frequency modulation power of the power grid according to the original frequency includes:
calculating the change rate of the original frequency and the frequency change quantity of the original frequency according to the original frequency;
calculating a secondary change rate of the original frequency according to the change rate of the original frequency;
acquiring rated frequency modulation power of the power grid, rated frequency of the power grid, inertia time constant and rated active power of the converter;
and calculating to obtain the actual frequency modulation power of the power grid according to the change rate of the original frequency, the secondary change rate of the original frequency, the frequency change quantity of the original frequency, the rated frequency modulation power of the power grid, the rated frequency of the power grid, the inertia time constant and the rated active power of the converter.
Optionally, the calculating the actual frequency modulation power of the power grid according to the change rate of the original frequency, the secondary change rate of the original frequency, the frequency change amount of the original frequency, the rated frequency modulation power of the power grid, the rated frequency of the power grid, the inertia time constant and the rated active power of the converter includes:
if the product of the secondary change rate of the original frequency and the change rate of the original frequency is larger than zero, calculating to obtain a power adjustment amount according to the change rate of the original frequency, the secondary change rate of the original frequency, the frequency change amount of the original frequency, the inertia time constant and the rated active power of the converter;
if the product of the secondary change rate of the original frequency and the change rate of the original frequency is smaller than zero, calculating to obtain a power adjustment amount according to the change rate of the original frequency, the frequency change amount of the original frequency, the inertia time constant and the rated active power of the converter;
and calculating according to the power adjustment quantity and the rated frequency modulation power of the power grid to obtain the actual frequency modulation power of the power grid.
Optionally, the determining the control mode of the power grid according to the original frequency includes:
calculating according to the original frequency of the power grid to obtain the frequency variation of the original frequency and the variation rate of the original frequency;
if the product of the frequency variation of the original frequency and the variation rate of the original frequency is larger than zero, and the absolute value of the frequency variation of the original frequency is larger than an inertia response critical value, determining that the control mode of the power grid is an inertia response mode;
and if the product of the frequency variation of the original frequency and the variation rate of the original frequency is not satisfied and is larger than zero, and the absolute value of the frequency variation of the original frequency is larger than an inertia response critical value, determining that the control mode of the power grid is a common control mode.
Optionally, after the frequency adjustment of the grid according to the actual frequency modulation power, the method further includes:
acquiring the adjustment frequency of the power grid;
if the adjustment frequency of the power grid meets the exit condition of the inertia response mode, determining an adjustment step length according to the actual frequency modulation power;
adjusting the actual frequency modulation power according to the adjustment step length to obtain target frequency modulation power;
performing frequency adjustment on the power grid according to the target frequency modulation power;
and returning to the step of executing the step of adjusting the actual frequency modulation power according to the adjustment step length to obtain the target frequency modulation power until the target frequency modulation power is equal to the rated frequency modulation power of the power grid.
The embodiment of the application also provides a power grid frequency adjusting device, which comprises:
the acquisition unit is used for acquiring the original frequency of the power grid;
the determining unit is used for determining a control mode of the power grid according to the original frequency;
the computing unit is used for computing the actual frequency modulation power of the power grid according to the original frequency if the control mode of the power grid is an inertia response mode, wherein the actual frequency modulation power is determined according to the secondary change rate of the original frequency, and the secondary change rate of the original frequency is used for representing the change speed of the change rate of the original frequency;
and the frequency modulation unit is used for carrying out frequency adjustment on the power grid according to the actual frequency modulation power.
Optionally, the calculating unit is configured to calculate a rate of change of the original frequency and a frequency change amount of the original frequency according to the original frequency;
calculating a secondary change rate of the original frequency according to the change rate of the original frequency;
acquiring rated frequency modulation power of the power grid, rated frequency of the power grid, inertia time constant and rated active power of the converter;
and calculating to obtain the actual frequency modulation power of the power grid according to the change rate of the original frequency, the secondary change rate of the original frequency, the frequency change quantity of the original frequency, the rated frequency modulation power of the power grid, the rated frequency of the power grid, the inertia time constant and the rated active power of the converter.
Optionally, the computing unit is specifically configured to:
if the product of the secondary change rate of the original frequency and the change rate of the original frequency is larger than zero, calculating to obtain a power adjustment amount according to the change rate of the original frequency, the secondary change rate of the original frequency, the frequency change amount of the original frequency, the inertia time constant and the rated active power of the converter;
if the product of the secondary change rate of the original frequency and the change rate of the original frequency is smaller than zero, calculating to obtain a power adjustment amount according to the change rate of the original frequency, the frequency change amount of the original frequency, the inertia time constant and the rated active power of the converter;
and calculating according to the power adjustment quantity and the rated frequency modulation power of the power grid to obtain the actual frequency modulation power of the power grid.
The embodiment of the application also provides a computer device, which comprises: a memory, a processor, and a bus system;
wherein the memory is used for storing programs;
the processor is used for executing the program in the memory so as to realize any one of the power grid frequency adjustment methods;
the bus system is used for connecting the memory and the processor so as to enable the memory and the processor to communicate.
The embodiments of the present application also provide a computer readable storage medium storing instructions that, when executed on a computer, cause the computer to perform any of the grid frequency adjustment methods described above.
The embodiment of the application provides a power grid frequency adjustment method, which comprises the following steps: acquiring the original frequency of a power grid; determining a control mode of a power grid according to the original frequency; if the control mode of the power grid is an inertia response mode, calculating to obtain actual frequency modulation power of the power grid according to the original frequency, wherein the actual frequency modulation power is determined according to the secondary change rate of the original frequency, and the secondary change rate of the original frequency is used for representing the change speed of the change rate of the original frequency; and carrying out frequency adjustment on the power grid according to the actual frequency modulation power. Therefore, under the condition that the control mode of the power grid is an inertia response mode, the actual frequency modulation power is calculated according to the secondary change rate of the original frequency of the power grid, and the power grid is subjected to frequency adjustment according to the actual frequency modulation power, namely, the change speed of the change rate of the original frequency of the power grid is considered during the power grid frequency adjustment, so that the power grid frequency adjustment can be realized more accurately, the accuracy of the power grid frequency adjustment is improved, and the stability of the power grid is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings may be obtained according to the provided drawings without inventive effort to a person skilled in the art.
Fig. 1 is a flow chart of a power grid frequency adjustment method according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a power grid frequency adjustment system according to an embodiment of the present application;
FIG. 3 is a schematic flow chart of an EMS control mode according to an embodiment of the present application;
fig. 4 is a schematic diagram illustrating a relationship between a charging coefficient K1 and a remaining power SOC in an EMS control mode according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of a relationship between a discharge coefficient K2 and a remaining power SOC in an EMS control mode according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a power grid frequency adjustment device according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terms "first," "second," "third," "fourth" and the like in the description and in the claims of this application and in the above-described figures, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments described herein may be implemented in other sequences than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The construction of new power systems using new energy as main body is being accelerated in China. Gradually reducing fossil energy use, new energy is being developed on a larger scale. In this context, the proportion of synchronous units with rotational kinetic energy reserves will be significantly reduced, and new energy will be connected to the power system in a higher proportion. However, new energy sources such as wind power and photovoltaic which are controlled conventionally cannot provide frequency support such as inertia and primary frequency modulation like a traditional synchronous generator set, and the new energy sources can deteriorate frequency dynamics of a system under power disturbance after replacing the traditional synchronous generator set. This can lead to a power system with continuously weakening of the equivalent inertia and a deterioration of the ability to resist frequency disturbances, leading to potentially severe frequency accidents, and therefore, a need for timely frequency adjustment to improve the stability of the power system when disturbances occur in the frequency of the power system.
However, the current power grid frequency adjustment method is usually adjusted based on the change rate of the power grid frequency, so that the accuracy is low, and the stability of the power grid cannot be further improved.
Therefore, in view of the above problems, embodiments of the present application provide a method, an apparatus, a device, and a readable storage medium for adjusting a power grid frequency, which can improve accuracy of power grid frequency adjustment, and further improve stability of a power grid.
Referring to fig. 1, the power grid frequency adjustment method provided in the embodiment of the present application may be applied to a power conversion system (Power Conversion System, PCS) controller, and specifically includes the following steps.
S101, acquiring the original frequency of the power grid.
In this embodiment, the original frequency of the power grid may be obtained first. It will be appreciated that as shown in fig. 2, the PCS controller may sample the grid voltage by means of a voltage sensor and then by further calculation may obtain the original frequency of the grid, which may be denoted by f. The rated frequency modulation power P of the power grid can be further obtained EMS That is, the active power set under the controller of the electric energy management system (Energy Management System, EMS) can be positive or negative, the positive value indicates the discharge of the energy storage battery pack, and the negative value indicates the discharge of the energy storage battery packThe value indicates that the energy storage battery is charged. The rated frequency f of the power grid can also be obtained N Inertia time constant T j And rated active power P of a converter, i.e. an energy storage battery N 。
S102, determining a control mode of the power grid according to the original frequency.
In this embodiment, after the original frequency of the power grid is obtained, the control mode of the power grid may be determined according to the original frequency. It can be understood that the PCS controller can determine the state of the power grid according to the original frequency of the power grid, that is, whether the power grid is in a stable state or an unstable state, so as to control the power grid in different control modes, thereby improving the accuracy of the frequency adjustment of the power grid and further improving the stability of the power grid. Specifically, if the power grid is in a stable state, the control mode of the power grid may be a common control mode, that is, an EMS control mode; if the power grid is in a unstable state, the control mode of the power grid can be an inertia response mode.
In one possible implementation manner, the frequency variation of the original frequency and the variation rate of the original frequency can be obtained by calculating according to the original frequency of the power grid; if the product of the frequency variation of the original frequency and the variation rate of the original frequency is larger than zero, and the absolute value of the frequency variation of the original frequency is larger than an inertia response critical value, determining that the control mode of the power grid is an inertia response mode; and if the product of the frequency variation of the original frequency and the variation rate of the original frequency is not satisfied and is larger than zero, and the absolute value of the frequency variation of the original frequency is larger than an inertia response critical value, determining that the control mode of the power grid is a common control mode.
It can be understood that the frequency variation Δf of the original frequency and the change rate of the original frequency can be calculated according to the original frequency f of the power gridWherein Δf=f-f N ，f N Is the rated frequency of the power grid. If it meets->And |Δf|>f dead Wherein f dead When the preset inertia response critical value is the preset inertia response critical value, that is, the product of the frequency variation of the original frequency and the variation rate of the original frequency is larger than zero, and the absolute value of the frequency variation of the original frequency is larger than the inertia response critical value, the state of the power grid can be described as an unstable state, and the control mode of the power grid can be an inertia response mode; if it does not meetAnd |Δf|>f dead Wherein f dead When the preset inertia response critical value is the preset inertia response critical value, that is, the product of the frequency variation of the original frequency and the variation rate of the original frequency is not satisfied and is greater than zero, and the absolute value of the frequency variation of the original frequency is greater than the inertia response critical value, the state of the power grid can be indicated to be in a stable state, and the control mode of the power grid can be a common control mode, namely an EMS control mode.
It should be noted that, as shown in fig. 3, when the control mode of the power grid is the EMS control mode, the PCS controller may receive the active and reactive power instructions set under the EMS controller, that is, the rated fm power P of the power grid EMS . The PCS calculates the power grid frequency F through the sampled three-phase voltage of the power grid, and the power grid frequency is stored into an array F [ N ]]In, i.e. Fj]=f, calculate rate of change of frequencyi is the current count value, i is automatically increased by 1 once per operation, j is a value corresponding to the time window deltat of the calculated frequency change rate, and the frequency change rate is +.>Save to array F1[ N ]]Is a kind of medium. The PCS controller is communicated with the new energy battery pack to obtain a residual electric quantity SOC value of the battery, and the charging and discharging power is limited according to the battery SOC value, so that in order to limit the maximum discharging power at the discharging end of the battery, the maximum charging power can be limited at the charging end of the battery, the charging and discharging power of the battery at the charging end of the battery is ensured to be limited within a safe value, the service life of the battery can be prolonged, and the safety of the battery is ensuredReliable.
Specifically, when b1< = SOC < = B2, the energy storage battery pack may be charged and discharged at the rated frequency modulation power, the charging coefficient k1=1, and the discharging coefficient k2=1, where B1 is the lower limit constant of the rated frequency modulation power charging and discharging SOC, and B2 is the upper limit constant of the rated frequency modulation power charging and discharging SOC; when B2 is smaller than SOC, the charging coefficient k1= [ (1-SOC)/(1-B2) ]ζn, the discharging coefficient k2=1, the charging is limited by a certain power, and the discharging is not affected; when SOC < B1, discharge coefficient k2= (SOC/B1)/(n), charge coefficient k1=1, discharge is limited by a certain power, and charging is not affected. n is a constant, when n=3, the graphs of the charge coefficient and the discharge coefficient are plotted as shown in fig. 4 and 5, respectively, and it can be seen from the graphs that the charge and discharge coefficients are continuously changed, so that the battery charge and discharge control is friendly.
EMS lower power P EMS >=0, i.e. discharge, when P EMS >K2*P Bat_N Setting power under EMS to be larger than power limit value of battery discharge, power setting of PCS is implemented according to limited power of battery, namely P ref ＝K2*P Bat_N (P Bat_N Is the rated power value of the battery); when P EMS <K2*P Bat_N The EMS lower power is not greater than the power limit value of the battery, and the PCS responds to the EMS power instruction, namely P ref ＝P EMS The method comprises the steps of carrying out a first treatment on the surface of the EMS lower power P EMS <0, i.e. charge, when P EMS <-K1*P Bat_N Setting power under EMS to be larger than power limit value of battery charging, power setting of PCS is implemented according to limited power of battery, namely P ref ＝-K1*P Bat_N The method comprises the steps of carrying out a first treatment on the surface of the When P EMS >-K1*P Bat_N The EMS lower power is not greater than the power limit value of the battery, and the PCS responds to the EMS power instruction, namely P ref ＝P EMS 。
And S103, if the control mode of the power grid is an inertia response mode, calculating to obtain the actual frequency modulation power of the power grid according to the original frequency.
In this embodiment, if it is determined that the control mode of the power grid is the inertia response mode, the actual frequency modulation power of the power grid may be obtained by calculation according to the original frequency. The actual frequency modulation power is determined according to the secondary change rate of the original frequency, wherein the secondary change rate of the original frequency is used for representing the change speed of the change rate of the original frequency. It can be understood that when the control mode of the power grid is the inertia response mode, the change rate of the original frequency can be calculated according to the original frequency, then the secondary change rate of the original frequency is calculated according to the change rate of the original frequency, and finally the actual frequency modulation power of the power grid is calculated based on the secondary change rate of the original frequency, so that the power grid can be subjected to frequency adjustment according to the actual frequency modulation power, namely, the change speed of the change rate of the original frequency of the power grid is considered during the frequency adjustment of the power grid, the frequency adjustment of the power grid can be realized more accurately, and the accuracy of the frequency adjustment of the power grid is improved, and the stability of the power grid is further improved.
In one possible implementation, the rate of change of the original frequency and the frequency variation of the original frequency may be calculated from the original frequency; calculating a secondary change rate of the original frequency according to the change rate of the original frequency; acquiring rated frequency modulation power of the power grid, rated frequency of the power grid, inertia time constant and rated active power of the converter; and calculating to obtain the actual frequency modulation power of the power grid according to the change rate of the original frequency, the secondary change rate of the original frequency, the frequency change quantity of the original frequency, the rated frequency modulation power of the power grid, the rated frequency of the power grid, the inertia time constant and the rated active power of the converter.
It will be appreciated that the rate of change of the original frequency can be calculated from the original frequency f of the gridAnd the frequency variation Δf of the original frequency, in particular, the original frequency F may be saved to an array F [ N ]]In, i.e. Fj]=f, then according toWherein i is the current count value, i is automatically increased by 1 each time operation is performed, j is a value corresponding to a time window deltat for calculating the frequency change rate to calculate the change rate of the original frequency +.>The calculation formula of the frequency variation of the original frequency is Δf=f-f N ，f N Is the rated frequency of the power grid. Then according to the rate of change of the original frequency +.>Calculating the secondary change rate of the original frequency +.>The specific formula is->The rated frequency modulation power P of the power grid can be obtained EMS Rated frequency f of electric network N Inertia time constant T j And rated active power P of a converter, i.e. an energy storage battery N Finally, the rate of change of the original frequency can be based on +>Second rate of change of original frequency +.>Frequency variation Δf of original frequency and rated frequency modulation power P of power grid EMS Rated frequency f of electric network N Inertia time constant T j And rated active power P of a converter, i.e. an energy storage battery N The actual frequency modulation power of the power grid is calculated, so that the power grid can be subjected to frequency adjustment according to the actual frequency modulation power, namely, the change speed of the change rate of the original frequency of the power grid is considered during the power grid frequency adjustment, and the power grid frequency can be adjusted more accurately, thereby improving the accuracy of the power grid frequency adjustment and further improving the stability of the power grid.
In one possible implementation manner, if the product of the secondary change rate of the original frequency and the change rate of the original frequency is greater than zero, a power adjustment amount may be calculated according to the change rate of the original frequency, the secondary change rate of the original frequency, the frequency change amount of the original frequency, the inertia time constant and the rated active power of the converter; if the product of the secondary change rate of the original frequency and the change rate of the original frequency is less than zero, calculating to obtain a power adjustment amount according to the change rate of the original frequency, the frequency change amount of the original frequency, the inertia time constant and the rated active power of the converter; and calculating according to the power adjustment quantity and the rated frequency modulation power of the power grid to obtain the actual frequency modulation power of the power grid.
It can be appreciated that the power adjustment amount Δp can be calculated first, and then the rated frequency modulation power P of the power grid can be calculated according to the power adjustment amount Δp EMS To calculate and obtain the actual frequency modulation power P of the power grid ref . If the product of the rate of change of the original frequency and the rate of change of the original frequency is greater than zero, i.eWhen the power grid frequency is in a situation of positive growth or faster negative growth, that is, the power grid frequency is in a serious instability state, the serious instability state of the power grid frequency needs to be restrained as soon as possible, that is, the new energy converter needs to provide larger inertia power to respond to the instability of the power grid frequency, and a formula for calculating the power adjustment quantity delta P can be as follows:
wherein m1, m2 is a constant,for the rate of change of the original frequency, +.>For the second rate of change of the original frequency, Δf is the frequency change of the original frequency, f N For the rated frequency of the power grid, T j For inertia time constant, the rated active power P of the converter, i.e. the energy storage battery N Is the rated active power of the converter. When serious instability occurs to the grid frequency, the inertia response power adjustment quantity delta P is equal to +.>And (1+|Δf|) increases exponentially, the power adjustment amounts ΔP and +|>And deltaf are in positive correlation with each other,for suppressing rapid changes in frequency (1+|Δf|) m2 For suppressing frequency offset.
If the product of the rate of change of the secondary of the original frequency and the rate of change of the original frequency is less than zero, i.eAt this time, the grid frequency is in a general unstable state, and a formula for calculating the power adjustment quantity deltap can be as follows:
wherein m2 is a constant,for the rate of change of the original frequency, +.>For the second rate of change of the original frequency, Δf is the frequency change of the original frequency, f N For the rated frequency of the power grid, T j For inertia time constant, the rated active power P of the converter, i.e. the energy storage battery N Is the rated active power of the converter. The power adjustment amount Δp of the inertia response increases exponentially with (1+|Δf|), and the power adjustment amount Δp is positively correlated with Δf, (1+|Δf|) m2 For suppressing frequency offset.
After the power adjustment quantity delta P is calculated, the power adjustment quantity delta P and the rated frequency modulation power P of the power grid can be used EMS To calculate and obtain the actual frequency modulation power P of the power grid ref The specific formula is as follows:
P ref ＝P EMS +ΔP；
wherein P is ref For the actual frequency modulation power of the power grid, P EMS Rated frequency modulation power P for electric network EMS Δp is the power adjustment amount. Because the change speed of the change rate of the original frequency of the power grid is considered during the power grid frequency adjustment, the adjustment of the power grid frequency can be realized more accurately, thereby improving the accuracy of the power grid frequency adjustment and further improving the stability of the power grid.
S104, carrying out frequency adjustment on the power grid according to the actual frequency modulation power.
In this embodiment, after the actual frequency modulation power of the power grid is obtained by calculation, the power grid can be frequency-adjusted according to the actual frequency modulation power, and since the change speed of the change rate of the original frequency of the power grid is considered during the power grid frequency adjustment, the adjustment of the power grid frequency can be more accurately realized, thereby improving the accuracy of the power grid frequency adjustment and further improving the stability of the power grid.
Specifically, when the actual frequency modulation power P ref >0 control the discharge of the energy storage battery pack when P ref >K2*P Bat_N Setting power under EMS to be larger than the power limit value of battery discharge, setting power of PCS controller to be the actual frequency modulation power, executing according to the limit power of battery to be P ref ＝K2*P Bat_N (P Bat_N Is the rated power value of the battery); when P ref <K2*P Bat_N Setting power under EMS not larger than power limit value of battery, power setting of PCS controller is that actual frequency modulation power P ref ＝P EMS +Δp. When the actual frequency modulation power P ref <0 control the discharge of the energy storage battery pack when P ref <-K1*P Bat_N Setting power under EMS to be larger than power limit value of battery charging, setting power of PCS controller to be actual frequency modulation power to be P according to limit power of battery ref ＝-K1*P Bat_N The method comprises the steps of carrying out a first treatment on the surface of the When P ref >-K1*P Bat_N Setting power under EMS not larger than power limit value of battery, power setting of PCS controller is that actual frequency modulation power P ref ＝P EMS +ΔP。
In one possible implementation manner, after the frequency of the power grid is adjusted according to the actual frequency modulation power, the adjusted frequency of the power grid can be obtained; if the adjustment frequency of the power grid meets the exit condition of the inertia response mode, determining an adjustment step length according to the actual frequency modulation power; adjusting the actual frequency modulation power according to the adjustment step length to obtain target frequency modulation power; performing frequency adjustment on the power grid according to the target frequency modulation power; and returning to the step of executing the step of adjusting the actual frequency modulation power according to the adjustment step length to obtain the target frequency modulation power until the target frequency modulation power is equal to the rated frequency modulation power of the power grid.
It can be understood that after the frequency adjustment is performed on the power grid according to the actual frequency modulation power, it can be determined whether the power grid frequency reaches the exit condition of the inertia response mode at this time, that is, whether the fluctuation of the power grid frequency has been reduced to a normal state at this time, and whether the control mode of the power grid needs to be switched from the inertia response mode to the normal control mode, that is, the EMS control mode. Therefore, the adjustment frequency of the power grid after the actual frequency modulation power adjustment can be obtained first, then the change rate of the adjustment frequency and the frequency change quantity of the adjustment frequency are calculated according to the adjustment frequency of the power grid, and if the product of the frequency change quantity of the adjustment frequency and the change rate of the adjustment frequency is smaller than zero and the absolute value of the frequency change quantity of the adjustment frequency is smaller than the inertia response critical value, whether the power grid frequency reaches the exit condition of the inertia response mode at the moment can be determined. Then the PCS controller can perform inertia response to exit the soft switching mode, namely, the adjustment step length P can be determined firstly T Actual FM power P at this time ref ＝P EMS +Δp ', Δp' is the amount of power adjustment when the frequency of the grid satisfies the exit condition of the inertia response mode. When DeltaP'>0, ΔP' to adjust the step size P T Reducing to obtain target frequency modulation power, and gradually adjusting the frequency of the power grid based on the target frequency modulation power until delta P' =0, at which point P ref ＝P EMS When DeltaP'<0, ΔP' to adjust the step size P T Adding to obtain target frequency modulation power, and gradually adjusting frequency of the power grid based on the target frequency modulation power until delta P' =0, at which point P ref ＝P EMS Therefore, soft switching from the inertia response mode to the EMS control mode is realized, the situation that power mutation is likely to be caused by adopting hard switching from the inertia response mode to the EMS control mode to further cause power grid frequency change and finally cause secondary fluctuation hazard of the power grid frequency is avoided, and therefore the accuracy of power grid frequency adjustment is improved, and the stability of the power grid is further improved.
Therefore, it can be seen that the embodiment of the application provides a power grid frequency adjustment method, in the case that the control mode of the power grid is the inertia response mode, the actual frequency modulation power is calculated according to the secondary change rate of the original frequency of the power grid, and the power grid is subjected to frequency adjustment according to the actual frequency modulation power, that is, the change speed of the change rate of the original frequency of the power grid is considered during the power grid frequency adjustment, so that the adjustment of the power grid frequency can be more accurately realized, the accuracy of the power grid frequency adjustment is improved, and the stability of the power grid is further improved.
Referring to fig. 6, an embodiment of the present application further provides a power grid frequency adjustment device, where the device includes:
an obtaining unit 601, configured to obtain an original frequency of a power grid;
a determining unit 602, configured to determine a control mode of the power grid according to the original frequency;
the calculating unit 603 is configured to calculate, if the control mode of the power grid is an inertia response mode, an actual fm power of the power grid according to the original frequency, where the actual fm power is determined according to a secondary rate of change of the original frequency, and the secondary rate of change of the original frequency is used to represent a rate of change of the original frequency;
and the frequency modulation unit 604 is used for carrying out frequency adjustment on the power grid according to the actual frequency modulation power.
Alternatively, the calculating unit 603 is configured to calculate a rate of change of the original frequency and a frequency change amount of the original frequency according to the original frequency;
calculating a secondary change rate of the original frequency according to the change rate of the original frequency;
acquiring rated frequency modulation power of the power grid, rated frequency of the power grid, inertia time constant and rated active power of the converter;
and calculating to obtain the actual frequency modulation power of the power grid according to the change rate of the original frequency, the secondary change rate of the original frequency, the frequency change quantity of the original frequency, the rated frequency modulation power of the power grid, the rated frequency of the power grid, the inertia time constant and the rated active power of the converter.
Optionally, the computing unit 603 is specifically configured to:
if the product of the secondary change rate of the original frequency and the change rate of the original frequency is larger than zero, calculating to obtain a power adjustment amount according to the change rate of the original frequency, the secondary change rate of the original frequency, the frequency change amount of the original frequency, the inertia time constant and the rated active power of the converter;
if the product of the secondary change rate of the original frequency and the change rate of the original frequency is smaller than zero, calculating to obtain a power adjustment amount according to the change rate of the original frequency, the frequency change amount of the original frequency, the inertia time constant and the rated active power of the converter;
and calculating according to the power adjustment quantity and the rated frequency modulation power of the power grid to obtain the actual frequency modulation power of the power grid.
Optionally, the determining unit 602 is specifically configured to:
calculating according to the original frequency of the power grid to obtain the frequency variation of the original frequency and the variation rate of the original frequency;
if the product of the frequency variation of the original frequency and the variation rate of the original frequency is larger than zero, and the absolute value of the frequency variation of the original frequency is larger than an inertia response critical value, determining that the control mode of the power grid is an inertia response mode;
and if the product of the frequency variation of the original frequency and the variation rate of the original frequency is not satisfied and is larger than zero, and the absolute value of the frequency variation of the original frequency is larger than an inertia response critical value, determining that the control mode of the power grid is a common control mode.
Optionally, the apparatus further comprises:
the acquiring unit 601 is further configured to acquire an adjustment frequency of the power grid;
the determining unit 602 is further configured to determine an adjustment step according to the actual fm power if the adjustment frequency of the power grid meets the exit condition of the inertia response mode;
the adjusting unit is used for adjusting the actual frequency modulation power according to the adjusting step length to obtain target frequency modulation power;
the frequency modulation unit 604 is further configured to perform frequency adjustment on the power grid according to the target frequency modulation power;
and the return unit is used for returning to the step of executing the step of adjusting the actual frequency modulation power according to the adjustment step length to obtain the target frequency modulation power until the target frequency modulation power is equal to the rated frequency modulation power of the power grid.
The embodiment of the application also provides a computer device, which comprises: a memory, a processor, and a bus system;
wherein the memory is used for storing programs;
the processor is used for executing the program in the memory so as to realize any one of the power grid frequency adjustment methods;
the bus system is used for connecting the memory and the processor so as to enable the memory and the processor to communicate.
The embodiments of the present application also provide a computer readable storage medium storing instructions that, when executed on a computer, cause the computer to perform any of the grid frequency adjustment methods described above.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method of grid frequency adjustment, the method comprising:
acquiring the original frequency of a power grid;
determining a control mode of a power grid according to the original frequency;
if the control mode of the power grid is an inertia response mode, calculating to obtain actual frequency modulation power of the power grid according to the original frequency, wherein the actual frequency modulation power is determined according to the secondary change rate of the original frequency, and the secondary change rate of the original frequency is used for representing the change speed of the change rate of the original frequency;
and carrying out frequency adjustment on the power grid according to the actual frequency modulation power.
2. The method according to claim 1, wherein said calculating the actual frequency modulated power of the grid from the original frequency comprises:
calculating the change rate of the original frequency and the frequency change quantity of the original frequency according to the original frequency;
calculating a secondary change rate of the original frequency according to the change rate of the original frequency;
acquiring rated frequency modulation power of the power grid, rated frequency of the power grid, inertia time constant and rated active power of the converter;
and calculating to obtain the actual frequency modulation power of the power grid according to the change rate of the original frequency, the secondary change rate of the original frequency, the frequency change quantity of the original frequency, the rated frequency modulation power of the power grid, the rated frequency of the power grid, the inertia time constant and the rated active power of the converter.
3. The method of claim 2, wherein the calculating the actual fm power of the power grid from the rate of change of the original frequency, the rate of change of the secondary of the original frequency, the frequency variance of the original frequency, the rated fm power of the power grid, the rated frequency of the power grid, the inertia time constant, and the rated active power of the current transformer comprises:
if the product of the secondary change rate of the original frequency and the change rate of the original frequency is larger than zero, calculating to obtain a power adjustment amount according to the change rate of the original frequency, the secondary change rate of the original frequency, the frequency change amount of the original frequency, the inertia time constant and the rated active power of the converter;
if the product of the secondary change rate of the original frequency and the change rate of the original frequency is smaller than zero, calculating to obtain a power adjustment amount according to the change rate of the original frequency, the frequency change amount of the original frequency, the inertia time constant and the rated active power of the converter;
and calculating according to the power adjustment quantity and the rated frequency modulation power of the power grid to obtain the actual frequency modulation power of the power grid.
4. The method of claim 1, wherein said determining a control mode of the power grid from said raw frequency comprises:
calculating according to the original frequency of the power grid to obtain the frequency variation of the original frequency and the variation rate of the original frequency;
if the product of the frequency variation of the original frequency and the variation rate of the original frequency is larger than zero, and the absolute value of the frequency variation of the original frequency is larger than an inertia response critical value, determining that the control mode of the power grid is an inertia response mode;
and if the product of the frequency variation of the original frequency and the variation rate of the original frequency is not satisfied and is larger than zero, and the absolute value of the frequency variation of the original frequency is larger than an inertia response critical value, determining that the control mode of the power grid is a common control mode.
5. The method of claim 1, further comprising, after said frequency adjusting said grid based on said actual frequency modulated power:
acquiring the adjustment frequency of the power grid;
if the adjustment frequency of the power grid meets the exit condition of the inertia response mode, determining an adjustment step length according to the actual frequency modulation power;
adjusting the actual frequency modulation power according to the adjustment step length to obtain target frequency modulation power;
performing frequency adjustment on the power grid according to the target frequency modulation power;
and returning to the step of executing the step of adjusting the actual frequency modulation power according to the adjustment step length to obtain the target frequency modulation power until the target frequency modulation power is equal to the rated frequency modulation power of the power grid.
6. A grid frequency adjustment device, the device comprising:
the acquisition unit is used for acquiring the original frequency of the power grid;
the determining unit is used for determining a control mode of the power grid according to the original frequency;
the computing unit is used for computing the actual frequency modulation power of the power grid according to the original frequency if the control mode of the power grid is an inertia response mode, wherein the actual frequency modulation power is determined according to the secondary change rate of the original frequency, and the secondary change rate of the original frequency is used for representing the change speed of the change rate of the original frequency;
and the frequency modulation unit is used for carrying out frequency adjustment on the power grid according to the actual frequency modulation power.
7. The apparatus according to claim 6, wherein the calculation unit is configured to calculate a change rate of the original frequency and a frequency change amount of the original frequency from the original frequency;
calculating a secondary change rate of the original frequency according to the change rate of the original frequency;
acquiring rated frequency modulation power of the power grid, rated frequency of the power grid, inertia time constant and rated active power of the converter;
and calculating to obtain the actual frequency modulation power of the power grid according to the change rate of the original frequency, the secondary change rate of the original frequency, the frequency change quantity of the original frequency, the rated frequency modulation power of the power grid, the rated frequency of the power grid, the inertia time constant and the rated active power of the converter.
8. The apparatus according to claim 7, wherein the computing unit is configured to:
if the product of the secondary change rate of the original frequency and the change rate of the original frequency is larger than zero, calculating to obtain a power adjustment amount according to the change rate of the original frequency, the secondary change rate of the original frequency, the frequency change amount of the original frequency, the inertia time constant and the rated active power of the converter;
if the product of the secondary change rate of the original frequency and the change rate of the original frequency is smaller than zero, calculating to obtain a power adjustment amount according to the change rate of the original frequency, the frequency change amount of the original frequency, the inertia time constant and the rated active power of the converter;
and calculating according to the power adjustment quantity and the rated frequency modulation power of the power grid to obtain the actual frequency modulation power of the power grid.
9. A computer device, comprising: a memory, a processor, and a bus system;
wherein the memory is used for storing programs;
the processor being adapted to execute a program in the memory to implement the method of any one of claims 1 to 5;
the bus system is used for connecting the memory and the processor so as to enable the memory and the processor to communicate.
10. A computer readable storage medium storing instructions which, when run on a computer, cause the computer to perform the method of any one of claims 1 to 5.
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