CN113991755B - New energy power generation unit self-synchronizing voltage source control method - Google Patents
New energy power generation unit self-synchronizing voltage source control method Download PDFInfo
- Publication number
- CN113991755B CN113991755B CN202111223621.2A CN202111223621A CN113991755B CN 113991755 B CN113991755 B CN 113991755B CN 202111223621 A CN202111223621 A CN 202111223621A CN 113991755 B CN113991755 B CN 113991755B
- Authority
- CN
- China
- Prior art keywords
- grid
- new energy
- self
- voltage
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000010248 power generation Methods 0.000 title claims abstract description 23
- 239000003990 capacitor Substances 0.000 claims description 21
- 238000004364 calculation method Methods 0.000 claims description 14
- 230000009466 transformation Effects 0.000 claims description 13
- 238000005070 sampling Methods 0.000 claims description 7
- 230000001360 synchronised effect Effects 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 238000003786 synthesis reaction Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 238000013016 damping Methods 0.000 claims description 3
- 238000004422 calculation algorithm Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 description 8
- 238000007665 sagging Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000003044 adaptive effect Effects 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- QIVUCLWGARAQIO-OLIXTKCUSA-N (3s)-n-[(3s,5s,6r)-6-methyl-2-oxo-1-(2,2,2-trifluoroethyl)-5-(2,3,6-trifluorophenyl)piperidin-3-yl]-2-oxospiro[1h-pyrrolo[2,3-b]pyridine-3,6'-5,7-dihydrocyclopenta[b]pyridine]-3'-carboxamide Chemical class C1([C@H]2[C@H](N(C(=O)[C@@H](NC(=O)C=3C=C4C[C@]5(CC4=NC=3)C3=CC=CN=C3NC5=O)C2)CC(F)(F)F)C)=C(F)C=CC(F)=C1F QIVUCLWGARAQIO-OLIXTKCUSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
-
- 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
-
- 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
- H02J3/381—Dispersed generators
-
- 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
-
- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention provides a new energy power generation unit self-synchronizing voltage source control method, which comprises the following steps: the new energy power generation unit gives out a frequency and voltage active support control method with self-synchronizing characteristic according to the active power and the reactive power of the system; and then, an impedance adapting algorithm is adopted to adjust the impedance characteristic between the internal potential with the self-synchronous characteristic and the grid-connected point voltage, a current instruction algorithm of the self-synchronous voltage source is provided, and finally, a current closed-loop control algorithm is provided in a three-phase coordinate system, so that the grid-connected current performance of the new energy power generation unit is improved while the voltage is controlled, and the overall performance of the new energy power generation unit is improved.
Description
Technical Field
The invention relates to the field of control of new energy grid-connected inverters, in particular to a method for controlling a self-synchronous voltage source of a new energy power generation unit.
Background
Under the dual-carbon background, the transformation of the energy structure will bring about the great change of the power grid structure, the traditional power grid will gradually show the dual-high characteristics of high power electronization and high-proportion new energy access, and the future power system will show the novel power system characteristics taking new energy as the theme. However, large-scale new energy power generation naturally has randomness, weak support and low disturbance resistance, so that the active support capacity and the frequency adjustment capacity of node voltage are weakened, and the risk of safe and stable operation of a power grid is increased. Meanwhile, a large amount of new energy is connected to enable the interactive coupling between the power electronic equipment and the power grid, between the converters and between the subnetworks to seriously influence the reliable consumption of the new energy and the stable operation of the system. Therefore, the active support technology and the system stable operation control method under the high-proportion penetration of the new energy are studied in depth, and the active support technology and the system stable operation control method have important significance for the new energy power system.
In recent years, expert scholars at home and abroad discuss the control problem of high-proportion access of new energy into a power grid from different angles, and simultaneously, the new grid-connected standard also puts forward higher requirements on the supporting capability of a new energy power generation unit, and technologies such as active/reactive droop control, self-synchronous voltage source control and the like are continuously applied. When the self-synchronous voltage source is in grid-connected operation, certain support is needed to be carried out on the voltage and frequency stability of the power grid, and the waveform quality of large-scale grid connection of new energy is ensured.
In order to solve the problems, expert students at home and abroad propose methods mainly comprising:
the Chinese patent application specification (CN 112350365A) entitled "a method for improving the inertial response effect of a self-synchronous control wind turbine generator" provides an active support technology for adjusting the system frequency by obtaining an internal potential frequency reference value according to damping power, however, the method cannot adjust the impedance characteristic between a power grid and a new energy power generation unit, cannot control the grid-connected current performance, and brings a certain difficulty to the large-scale grid-connected application of new energy.
The technical scheme disclosed in the specification (CN 113346522A) of Chinese patent application entitled self-synchronous voltage source adaptive control method and system based on moment of inertia is provided with a moment of inertia adaptive control function determination adaptive control strategy, so that the moment of inertia characteristics can be improved under different power grid states, and the adjustment quantity of the moment of inertia can be distributed to each self-synchronous voltage source according to the capacity ratio of the self-synchronous voltage source. The method can adaptively change the moment of inertia, but is complex in control method and cannot guarantee the grid-connected current quality.
The Chinese patent application specification (CN 112821460A) entitled self-synchronizing voltage source wind turbine generator set operated by a synchronous generator supporting a power grid provides a dynamic compensation algorithm to optimize wind energy utilization efficiency and inertia response effect, and provides a consistency algorithm for controlling voltage stabilization in an off-grid switching process, wherein a control method is complex and cannot consider current control performance.
In a word, the control capability of the voltage source control and the current performance is difficult to be simultaneously considered in the grid-connected mode of the existing VSG technology, and the improvement of the grid-connected current performance of the self-synchronous voltage source under the condition of a complex power grid is not facilitated.
Disclosure of Invention
The invention aims to overcome the limitations of various technical schemes, and provides a self-synchronous voltage source control method of a new energy power generation unit, aiming at the problems of active support of a self-synchronous voltage source, improvement of grid-connected current performance and the like in a grid-connected mode of VSG technology.
The invention provides a new energy power generation unit self-synchronizing voltage source control method, which comprises the following steps:
the sampling includes collecting the following data: new energy grid-connected inverter filter capacitor voltage u ca ,u cb ,u cc New energy grid-connected inverter bridge arm side inductance current i La ,i Lb ,i Lc Grid-connected point voltage u of new energy grid-connected inverter oa ,u ob ,u oc Grid-connected point current i of new energy grid-connected inverter oa ,i ob ,i oc ；
The coordinate transformation includes coordinate transformation of: filtering capacitor voltage u of new energy grid-connected inverter ca ,u cb ,u cc And grid-connected point current i oa ,i ob ,i oc Respectively carrying out single synchronous rotation coordinate transformation to obtain dq component U of filter capacitor voltage cd ,U cq And dq component I of grid-tie point current od ,I oq ；
step 3, according to the average active power P obtained in the step 2 and an active power instruction P given by the new energy grid-connected inverter 0 Active power instruction P given by new energy grid-connected inverter 0 Rated angular frequency omega at time 0 Obtaining the angular frequency omega of the self-synchronizing voltage source through a power angle control equation, and integrating omega to obtain the vector angle theta of the self-synchronizing voltage source;
step 4, according to the average reactive power Q obtained in the step 2 and a reactive power instruction Q given by the new energy grid-connected inverter 0 Given reactive power instruction Q of new energy grid-connected inverter 0 Rated voltage U at the time 0 Obtaining a terminal voltage amplitude command E of the self-synchronous voltage source through a reactive power control equation * According to the steps ofVector angle θ and terminal voltage amplitude command E of the self-synchronizing voltage source obtained in step 3 * Obtaining a three-phase terminal voltage instruction of the self-synchronous voltage source through an instruction synthesis equation
Step 5, firstly, according to the three-phase terminal voltage instruction obtained in step 4
And grid voltage u of grid-connected point obtained in step 1 oa ,u ob ,u oc Obtaining a current command signal +.>
Based on the current command signal->
Bridge arm side inductor current i in step 1 La ,i Lb ,i Lc The control signal u is obtained by a current control equation a ,u b ,u c According to u a ,u b ,u c Generating a PWM control signal of the switching tube.
Preferably, the calculating step of the average active power P and the average reactive power Q in the step 2 includes:
the calculation equation of the average active power P is as follows:
the calculation equation of the average reactive power Q is as follows:
wherein Q is pq Equation figures of merit, ω, for power calculation h Harmonics to be filtered out for a trapThe wave angular frequency, s is Laplacian, τ is the time constant of the first order low pass filter, and h is the harmonic frequency to be filtered.
Preferably, the power angle control equation in step 3 is:
wherein m is a power angle control droop coefficient, J is virtual moment of inertia of the simulated synchronous generator set, and s is Laplacian.
Preferably, the reactive control equation in step 4 is:
E * ＝U 0 +n(Q 0 -Q)
where n is the reactive-voltage sag coefficient.
Preferably, the three-phase terminal voltage command synthesis equation in step 4 is:
preferably, the virtual impedance control equation in step 5 is:
wherein R is v Is virtual resistance, L v Is a virtual inductance.
Preferably, the current control equation in step 5 is:
wherein K is p K is the current loop proportional control coefficient i Proportional coefficient, K of current loop integral controller ri Current loop resonant controller scaling factor, Q i Is the quality factor of the current loop quasi-resonant regulator.
After the invention is adopted, the novel energy grid-connected inverter adopting the self-synchronous voltage source technology has the following advantages:
1. impedance adaptation between the new energy power generation unit and the large power grid can be realized;
2. the grid-connected current performance is improved while the self-synchronous voltage source supporting technology of the new energy power generation unit is realized.
Drawings
FIG. 1 is a new energy grid-connected inverter topology based on a self-synchronizing voltage source of the present invention;
FIG. 2 is a control block diagram of the new energy power generation unit self-synchronizing voltage source of the present invention;
FIG. 3 is a waveform diagram of an active power simulation in an embodiment of the present invention;
FIG. 4 is a waveform diagram of voltage simulation of a grid-connected point in an embodiment of the present invention;
FIG. 5 is a waveform diagram of grid-tie point current simulation in an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. 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.
Fig. 1 is a topology of a new energy grid-connected inverter based on a self-synchronizing voltage source in an embodiment of the invention. The topology of the new energy grid-connected inverter comprises a direct current source U dc DC side filter capacitor C dc Three-phase full-bridge inverter circuit, filter inductor L, filter capacitor C and grid-connected equivalent resistor R g Grid-connected equivalent inductance L g Three-phase network e a 、e b 、e c DC side filter capacitor C dc And is connected with a direct current source U dc And a three-phase full-bridge inverter circuit connected in series with the DC side power supply U dc Between the filter inductor L and the filter capacitor C, the passive damping resistor R is connected in series first c Then is connected in parallel with the filter inductance L and the grid-connected equivalent resistance R g Between the grid-connected equivalent inductances L g Series connected in parallel with equivalent resistor R g And a three-phase network e a 、e b 、e c Between them.
Specifically, the parameters in this embodiment are as follows: DC bus voltage U dc The effective value of the output alternating-current line voltage is 380V/50Hz, the rated capacity is 100kW, the filter inductance L=0.3mH of the new energy grid-connected inverter, the filter capacitance of the new energy grid-connected inverter is C=200 mu F, and the sampling frequency F of the new energy grid-connected inverter is equal to 650V s Is 10kHz, thus T s ＝100μs。
Referring to fig. 1 and 2, an embodiment of the present invention provides a method for controlling a self-synchronizing voltage source of a new energy power generation unit, including the following steps:
the sampling includes collecting the following data: new energy grid-connected inverter filter capacitor voltage u ca ,u cb ,u cc New energy grid-connected inverter bridge arm side inductance current i La ,i Lb ,i Lc Grid-connected point voltage u of new energy grid-connected inverter oa ,u ob ,u oc Grid-connected point current i of new energy grid-connected inverter oa ,i ob ,i oc 。
The coordinate transformation includes coordinate transformation of: filtering capacitor voltage u of new energy grid-connected inverter ca ,u cb ,u cc And grid-connected point current i oa ,i ob ,i oc Respectively carrying out single synchronous rotation coordinate transformation to obtain dq component U of filter capacitor voltage cd ,U cq Dq component I of bridge arm side inductance current Ld ,I Lq And dq component I of grid-tie point current od ,I oq 。
The active power calculation equation is as follows:
the reactive power calculation equation is:
wherein Q is pq Calculating equation figures of merit, ω, for power h The harmonic angular frequency to be filtered for the trap, s is the Laplacian, τ is the time constant of the first order low pass filter, and h is the harmonic frequency to be filtered.
In the present embodiment, the harmonics mainly filtered out are considered to be 2 nd and 3 rd harmonics, so h=2, 3 is selected, where ω h = 628.3186rad/s,942.4779rad/s. The first-order low-pass filter mainly takes higher harmonic wave filtering into consideration, does not influence dynamic response, and generally takes tau less than or equal to 2e -3 s, the value τ=1.5e in this example -4 s; quality factor Q pq Mainly consider the filtering effect of the trap, in this example, Q is selected pq ＝0.5。
Step 3, according to the average active power P obtained in the step 2 and an active power instruction P given by the new energy grid-connected inverter 0 Active power instruction P given by new energy grid-connected inverter 0 Rated angular frequency omega at time 0 And obtaining the angular frequency omega of the self-synchronizing voltage source through a power angle control equation, and integrating omega to obtain the vector angle theta of the self-synchronizing voltage source.
The power angle control equation is as follows:
wherein m is a power angle control droop coefficient, J is virtual moment of inertia of the simulated synchronous generator set, and s is Laplacian.
The power angle control equation shows the active power sagging curve relation and the virtual inertia of the new energy grid-connected inverter. The virtual inertia marks the change rate of the system frequency, and in order to ensure that the system frequency changes stably, the virtual inertia needs to be larger; however, the virtual inertia is equivalent to adding a first-order inertia link in the system, and a large virtual inertia may cause instability of the system. Thus parameter selection requires compromise processing. To ensure system stability, the inertia time constant is within the range of tau virtual ＝Jω 0 m≤2e -3 s; . The relation of the active power sagging curve in the power angle control equation comprises three coefficients, wherein the power angle control sagging coefficient m represents the slope of the sagging curve, and when the value principle is 100% of active power change, the frequency change is within 0.5 Hz; given active power instruction P 0 And corresponding nominal angular frequency omega 0 The position relation of the sagging curve is expressed, and the active power output by the new energy grid-connected inverter is mainly considered as P 0 When it is output frequency size.
In this embodiment, the power angle control droop coefficient takes on the value of
Taking tau according to the principle of taking value of inertia time constant virtual ＝Jω 0 m＝1.5e -3 s, J=0.2 kg.m 2 To ensure that energy does not flow to the DC side during control operation, an active power instruction is given a value of P 0 =100 kW, at which point the corresponding nominal angular frequency takes on the value ω 0 ＝314.1593rad/s。
Step 4, according to the average reactive power Q obtained in the step 2 and a reactive power instruction Q given by the new energy grid-connected inverter 0 Given reactive power instruction Q of new energy grid-connected inverter 0 Rated voltage U at the time 0 Obtaining a terminal voltage amplitude command E of the self-synchronous voltage source through a reactive power control equation * According to the vector angle theta and the terminal voltage amplitude command E of the self-synchronous voltage source obtained in the step 3 * Obtaining a three-phase terminal voltage instruction of the self-synchronous voltage source through an instruction synthesis equation
The reactive power control equation is:
U * ＝U 0 +n(Q 0 -Q)
wherein U is 0 Giving reactive power instruction Q to new energy grid-connected inverter 0 The rated output capacitor voltage at the time, n, is the reactive-voltage droop coefficient.
The three-phase terminal voltage command synthesis equation is as follows:
when the reactive power of the reactive power-voltage sag coefficient n is 100% in the value principle, the voltage amplitude changes within 2%; given reactive power instruction Q 0 And corresponding rated output capacitance voltage U 0 The position relation of the sagging curve is expressed, and the output reactive power of the new energy grid-connected inverter is mainly considered as Q 0 When it is outputting voltage.
In this embodiment, the reactive-voltage sag factor takes on the value of
Given reactive power instruction Q 0 =0, the corresponding rated output capacitance voltage U 0 ＝380V。
Step 5, firstly, according to the three-phase terminal voltage instruction obtained in step 4
And grid voltage u of grid-connected point obtained in step 1 oa ,u ob ,u oc Obtaining a current command signal +.>
Based on the current command signal->
Bridge arm side inductor current i in step 1 La ,i Lb ,i Lc The control signal u is obtained by a current control equation a ,u b ,u c According to u a ,u b ,u c Generating a PWM control signal of the switching tube.
The virtual impedance control equation is:
wherein R is v Is virtual resistance, L v Is a virtual inductance.
The current control equation is:
wherein K is p K is the current loop proportional control coefficient i Proportional coefficient, K of current loop integral controller ri Current loop resonant controller scaling factor, Q i Is the quality factor of the current loop quasi-resonant regulator.
In this embodiment, the virtual resistor takes the value R v =0.01Ω, the virtual inductance takes on the value L v =0.22 mH, the current loop proportional control coefficient takes on the value K p =1, the proportional coefficient of the current loop integral controller takes on the value K i =10. Quasi-resonant regulators mainly consider eliminating DC components in the system, quality factor Q i Mainly considering the gain and stability of the resonant regulator, in this example, Q is chosen i =0.7; direct current of current loop is comprehensively considered to quasi-resonance controller proportionality coefficientComponent suppression capability and system stability, in this example, K is selected ri ＝50。
In order to demonstrate the technical effects of the invention, the inventive examples were simulated.
Fig. 3, 4, and 5 are active power waveforms, grid-connected point voltage waveforms, and grid-connected point current waveforms of the new energy power generation unit in the case of weak grid (short circuit ratio scr=1.5), respectively. As can be seen from fig. 3, the active power P can be quickly and correctly tracked by the new energy power generation unit self-synchronous voltage source control method 0 The system can emit rated active power of 100kW; as can be seen from fig. 4 and fig. 5, the self-synchronous voltage source control method for the new energy power generation unit provided by the invention can ensure that the grid-connected point voltage and the grid-connected point current are stable and three-phase symmetrical, and the system operates stably.
The foregoing is merely illustrative embodiments of the present invention, and the present invention is not limited thereto, and any changes or substitutions that may be easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (4)
1. A new energy power generation unit self-synchronous voltage source control method, wherein the topology of a new energy grid-connected inverter based on a self-synchronous voltage source comprises a direct current source U dc DC side filter capacitor C dc Three-phase full-bridge inverter circuit, filter inductor L, filter capacitor C and grid-connected equivalent resistor R g Grid-connected equivalent inductance L g Three-phase network e a 、e b 、e c DC side filter capacitor C dc And is connected with a direct current source U dc And a three-phase full-bridge inverter circuit connected in series with the DC side power supply U dc Between the filter inductor L and the filter capacitor C, the passive damping resistor R is connected in series first c Then is connected in parallel with the filter inductance L and the grid-connected equivalent resistance R g Between the grid-connected equivalent inductances L g Series connected in parallel with equivalent resistor R g And three-phase electricityNet e a 、e b 、e c Between them;
characterized in that the method comprises the following steps:
step 1, sampling and coordinate transformation;
the sampling includes collecting the following data: new energy grid-connected inverter filter capacitor voltage u ca ,u cb ,u cc New energy grid-connected inverter bridge arm side inductance current i La ,i Lb ,i Lc Grid-connected point voltage u of new energy grid-connected inverter oa ,u ob ,u oc Grid-connected point current i of new energy grid-connected inverter oa ,i ob ,i oc ；
The coordinate transformation includes coordinate transformation of: filtering capacitor voltage u of new energy grid-connected inverter ca ,u cb ,u cc And grid-connected point current i oa ,i ob ,i oc Respectively carrying out single synchronous rotation coordinate transformation to obtain dq component U of filter capacitor voltage cd ,U cq And dq component I of grid-tie point current od ,I oq ；
Step 2, based on the dq component U of the filter capacitor voltage obtained in step 1 cd ,U cq And dq component I of grid-tie point current od ,I oq Obtaining average active power P and average reactive power Q through an active power calculation equation and a reactive power calculation equation;
step 3, according to the average active power P obtained in the step 2 and an active power instruction P given by the new energy grid-connected inverter 0 Active power instruction P given by new energy grid-connected inverter 0 Rated angular frequency omega at time 0 Obtaining the angular frequency omega of the self-synchronizing voltage source through a power angle control equation, and integrating omega to obtain the vector angle theta of the self-synchronizing voltage source;
step 4, according to the average reactive power Q obtained in the step 2 and a reactive power instruction Q given by the new energy grid-connected inverter 0 Given reactive power instruction Q of new energy grid-connected inverter 0 Rated voltage U at the time 0 Obtaining a terminal voltage amplitude command E of the self-synchronous voltage source through a reactive power control equation * According to the vector angle theta and the terminal voltage amplitude command E of the self-synchronous voltage source obtained in the step 3 * Obtaining a three-phase terminal voltage instruction of the self-synchronous voltage source through an instruction synthesis equation
Step 5, firstly, according to the three-phase terminal voltage instruction obtained in step 4
And grid voltage u of grid-connected point obtained in step 1 oa ,u ob ,u oc Obtaining a current command signal +.>
Based on the current command signal->
Bridge arm side inductor current i in step 1 La ,i Lb ,i Lc The control signal u is obtained by a current control equation a ,u b ,u c According to u a ,u b ,u c Generating a PWM control signal of the switching tube;
the three-phase terminal voltage command synthesis equation in the step 4 is as follows:
the virtual impedance control equation in step 5 is:
wherein R is v Is virtual resistance, L v Is a virtual inductance;
the current control equation in step 5 is:
wherein K is p K is the current loop proportional control coefficient i Proportional coefficient, K of current loop integral controller ri Current loop resonant controller scaling factor, Q i Is the quality factor of the current loop quasi-resonant regulator.
2. The method for controlling a self-synchronizing voltage source of a new energy power generation unit according to claim 1, wherein the calculating step of the average active power P and the average reactive power Q in step 2 includes:
the calculation equation of the average active power P is as follows:
the calculation equation of the average reactive power Q is:
wherein Q is pq Equation figures of merit, ω, for power calculation h The harmonic angular frequency to be filtered for the trap is s is Laplacian, τ is the time constant of the first-order low-pass filter, and h is the harmonic frequency to be filtered.
3. The method for controlling a self-synchronizing voltage source of a new energy power generation unit according to claim 1, wherein the power angle control equation in step 3 is:
wherein m is a power angle control droop coefficient, J is virtual moment of inertia of the simulated synchronous generator set, and s is Laplacian.
4. The method for controlling a self-synchronizing voltage source of a new energy power generation unit according to claim 1, wherein the reactive control equation in step 4 is:
E * ＝U 0 +n(Q 0 -Q)
where n is the reactive-voltage sag coefficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111223621.2A CN113991755B (en) | 2021-10-20 | 2021-10-20 | New energy power generation unit self-synchronizing voltage source control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111223621.2A CN113991755B (en) | 2021-10-20 | 2021-10-20 | New energy power generation unit self-synchronizing voltage source control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113991755A CN113991755A (en) | 2022-01-28 |
| CN113991755B true CN113991755B (en) | 2023-06-13 |
Family
ID=79739711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111223621.2A Active CN113991755B (en) | 2021-10-20 | 2021-10-20 | New energy power generation unit self-synchronizing voltage source control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113991755B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114696320B (en) * | 2022-03-25 | 2024-04-19 | 国网湖北省电力有限公司电力科学研究院 | New energy power generation equipment self-synchronous voltage source control and low voltage ride through control dual-mode switching control method |
| CN114865711B (en) * | 2022-04-01 | 2024-05-03 | 国网湖北省电力有限公司电力科学研究院 | Dual-mode switching control method and system for new energy grid-connected inverter |
| CN115021317B (en) * | 2022-06-24 | 2024-03-19 | 合肥工业大学 | New energy source synchronous grid-connected inverter low voltage ride through control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201015911D0 (en) * | 2010-09-22 | 2010-10-27 | Zhong Qingchang | Robust droop controller for inventors to achieve exact proportional load sharing when connected in parallel |
| CN106410849A (en) * | 2016-11-10 | 2017-02-15 | 合肥工业大学 | Virtual synchronous generator-based microgrid inverter balance control method |
| CN106849186A (en) * | 2016-12-22 | 2017-06-13 | 合肥工业大学 | A kind of energy storage inverter master-slave control method based on virtual synchronous generator |
| CA3018726A1 (en) * | 2017-09-26 | 2019-03-26 | The Governors Of The University Of Alberta | Grid-supporting inverters with significantly reduced storage requirements |
-
2021
- 2021-10-20 CN CN202111223621.2A patent/CN113991755B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201015911D0 (en) * | 2010-09-22 | 2010-10-27 | Zhong Qingchang | Robust droop controller for inventors to achieve exact proportional load sharing when connected in parallel |
| CN106410849A (en) * | 2016-11-10 | 2017-02-15 | 合肥工业大学 | Virtual synchronous generator-based microgrid inverter balance control method |
| CN106849186A (en) * | 2016-12-22 | 2017-06-13 | 合肥工业大学 | A kind of energy storage inverter master-slave control method based on virtual synchronous generator |
| CA3018726A1 (en) * | 2017-09-26 | 2019-03-26 | The Governors Of The University Of Alberta | Grid-supporting inverters with significantly reduced storage requirements |
Non-Patent Citations (1)
| Title |
|---|
| 虚拟同步发电机技术综述;吴军凯;张志;朱祖宏;刘畅;唐校;张兆云;;东莞理工学院学报(第05期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113991755A (en) | 2022-01-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108023352B (en) | Power grid high-frequency impedance remodeling device and method for inhibiting distributed generation resonance | |
| CN106410849B (en) | Microgrid inverter balance control method based on virtual synchronous generator | |
| CN106208159B (en) | Bavin storage mixing independent micro-grid dynamic power compensation method based on virtual synchronous generator | |
| CN113991755B (en) | New energy power generation unit self-synchronizing voltage source control method | |
| CN106159999B (en) | Bavin storage mixing independent micro-grid dynamic frequency stable strategy based on virtual synchronous generator | |
| CN103872703B (en) | A kind of control system for solving low voltage crossing and strategy process thereof | |
| CN106602916B (en) | A kind of mixing level three-phase four-bridge arm converter device and control method | |
| CN113964879B (en) | New energy grid-connected inverter self-synchronizing voltage source control method | |
| CN108429281A (en) | A kind of LCL type gird-connected inverter parallel virtual impedance adjustment | |
| CN108306332B (en) | LCL type grid-connected inverter system and current tracking control method | |
| CN110086171A (en) | A kind of gird-connected inverter resonance suppressing method and device enhancing system rejection to disturbance ability | |
| CN113839388A (en) | Current double-loop control method of active power filter based on hybrid load | |
| CN116260348B (en) | MMC-based high-capacity electrolytic hydrogen production hybrid rectifier and control method | |
| CN116014748A (en) | Active support-based low-voltage ride through control method and device for energy storage converter | |
| Xu et al. | High-frequency resonance suppression based on unified MMC high-frequency impedance model | |
| CN107134792B (en) | Non Power Compensation Process when virtual synchronous Generator Network imbalance is fallen | |
| CN115021317B (en) | New energy source synchronous grid-connected inverter low voltage ride through control method | |
| CN112260302A (en) | Energy storage PCS multi-machine parallel resonance active suppression method of virtual RC branch circuit | |
| CN109524992B (en) | Grid-connected converter self-adaptive control method and control system under weak grid | |
| CN114865711B (en) | Dual-mode switching control method and system for new energy grid-connected inverter | |
| CN114285081B (en) | Wide area power system stabilizing method based on self-adaptive virtual resistor | |
| CN113595138B (en) | Load voltage control method of impedance isolation type medium-voltage power supply quality improving system | |
| CN113937789B (en) | Voltage source type double-fed fan feedforward damping control method based on fractional order filtering | |
| CN109861308B (en) | Virtual synchronous generator fault ride-through control method | |
| CN116365584A (en) | Inverter control mode switching method in distribution network system with multiple inverter access |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |