CN110783954B - Method and system for controlling transmission power of island system - Google Patents
Method and system for controlling transmission power of island system Download PDFInfo
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- CN110783954B CN110783954B CN201911053086.3A CN201911053086A CN110783954B CN 110783954 B CN110783954 B CN 110783954B CN 201911053086 A CN201911053086 A CN 201911053086A CN 110783954 B CN110783954 B CN 110783954B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 13
- 230000005404 monopole Effects 0.000 claims abstract description 20
- 230000000630 rising effect Effects 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims 2
- 238000004590 computer program Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The application discloses a method and a system for controlling transmission power of an island system, and belongs to the technical field of power systems. The method of the application comprises the following steps: acquiring an island system current signal and a power signal; determining whether the island system fault is a monopole locking fault or not and determining the direct current voltage adjustable range of the island system converter station; boosting the direct current voltage of the converter station of the island system in the adjustable range, reducing the direct current of the converter station to a preset range, and obtaining the normal pole power value of the converter station; and determining that the normal pole power value of the converter station is reduced and is reduced to the inflow power value of the converter station, stopping boosting the direct-current voltage of the converter station of the island system and stopping reducing the direct-current of the converter station. The application has simple process and easy realization, and can realize the fault ride-through of the new energy unit of the island system economically and efficiently.
Description
Technical Field
The present application relates to the technical field of power systems, and more particularly, to a method and system for controlling transmission power of an island system.
Background
When the new energy generator set works in an island operation mode, the new energy generator set is directly sent out through the flexible direct current transmission system, the converter station needs to adopt a passive control mode, grid-connected voltage and frequency support are provided for the passive system by the converter station, and because the inflow of power cannot be notified, when a monopole locking fault occurs, the power flowing into the converter station and the direct current component and the alternating current component of bridge arm current form a positive correlation.
Disclosure of Invention
In view of the above problems, the present application proposes a method for controlling transmission power of an island system, including:
determining that a new energy true bipolar flexible direct island system fails, and acquiring an island system current signal and a power signal;
determining whether the island system fault is a monopole locking fault according to the current signal and the power signal, and acquiring a direct-current voltage adjustable range of a converter station of the island system according to a preset inverse time limit protection coefficient and overcurrent time of the island system after determining that the island system is the monopole locking fault;
boosting the direct current voltage of the converter station of the island system in the adjustable range, reducing the direct current of the converter station to a preset range, and determining the normal pole power value of the converter station;
and determining that the normal pole power value of the converter station is reduced and is reduced to the inflow power value of the converter station, stopping boosting the direct-current voltage of the converter station of the island system and stopping reducing the direct-current of the converter station.
Alternatively, the adjustable range is 1 to 1.299p.u.
Optionally, the preset range is 1 to 1.768p.u.
Optionally, the method further comprises: and after the direct current of the converter station is reduced to a preset range, enabling the inverse time limit protection of the direct current of the converter station to be inactive.
Optionally, the method further comprises: and after the normal pole power value of the converter station is determined to be reduced and reduced to the inflow power value of the converter station, the direct-current voltage of the converter station of the island system is recovered to the reference voltage of the direct-current voltage of the converter station.
The application also provides a system for controlling the transmission power of the island system, which comprises:
the parameter acquisition module is used for determining that the new energy true bipolar flexible straight island system fails and acquiring an island system current signal and a power signal;
the fault judging module is used for determining whether the island system fault is a monopole locking fault according to the current signal and the power signal, and determining the direct-current voltage adjustable range of the island system converter station according to the preset inverse time limit protection coefficient and the overcurrent time of the island system after determining that the island system is the monopole locking fault;
the adjusting module is used for boosting the direct current voltage of the island system converter station in the adjustable range and reducing the direct current of the converter station to a preset range to obtain a normal pole power value of the converter station;
the judging module is used for determining that the normal pole power value of the converter station is reduced and is reduced to the inflow power value of the converter station, stopping boosting the direct-current voltage of the converter station of the island system and stopping reducing the direct-current of the converter station.
Alternatively, the adjustable range is 1 to 1.299p.u.
Optionally, the preset range is 1 to 1.768p.u.
Optionally, the adjusting module is configured to reduce the dc current of the converter station to a preset range, and then prevent the dc current of the converter station from acting during inverse time-limiting protection.
Optionally, the judging module is configured to restore the dc voltage of the island system converter station to the reference voltage of the dc voltage of the converter station after determining that the normal pole power value of the converter station drops and drops to the inflow power value of the converter station.
The application has simple process and easy realization, and can realize the fault ride-through of the new energy unit of the island system economically and efficiently.
Drawings
FIG. 1 is a flow chart of a method for controlling transmission power of an island system according to the present application;
fig. 2 is a system configuration diagram for controlling transmission power of an island system according to the present application.
Detailed Description
The exemplary embodiments of the present application will now be described with reference to the accompanying drawings, however, the present application may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present application and fully convey the scope of the application to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the application. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The power flowing in the converter station has a positive correlation with the direct current component and the alternating current component of the bridge arm current.
Wherein i is armp For upper arm current, i armn For the current of the lower bridge arm, I dc Is direct current, i va The power that P converter station is inrush is ac.
The upper and lower bridge arm currents of the converter station can be changed into an equation with the independent variable of power P. Each power corresponds to a bridge arm current one-to-one.
When monopolar locking occurs, the power of normal pole inrush has surplus power of locking pole in addition to normal power, the power becomes P',
P'＝P+VP
and when the P is not in fault, the power is gushed, and VP is surplus power which needs to be transferred after the fault.
However, when the unipolar lock occurs, the power rises to cause the rise of the bridge arm current, and the fan load shedding requires time, and the direct current voltage U is raised based on the allowable range of action protection after the fault occurs and during the fan load shedding completion dc To the DC voltage protection limit U dcrpro Under the condition of (1), the rising of the bridge arm current caused by surplus power can be greatly reduced, and the maximum value of the bridge arm current is lower than the protection value i of bridge arm overcurrent protection armpro 。
Due to the inverse time-limit action protection principle, the magnitude of the bridge arm overcurrent protection value and the direct current voltage protection value is a function inversely proportional to time.
Wherein i is arm And U dc The current and the direct current voltage of the bridge arm of the converter station are used for normal operation of the converter station, and x and y are inverse time limit protection coefficients.
The bridge arm overcurrent protection value generally takes the effective value of the current as a judging reference, and because the bridge arm current contains direct current bias, the bridge arm is taken as an example, and the boundary equation of the bridge arm current is as follows:
with this as a boundary condition we can get the maximum power P that can be tolerated by a normal pole converter station max ：
In the input control mode, the required consumed power is reduced to
P cooper ＝P+VP+P max ＜VP (6)
From the analysis, when single-stage blocking occurs, the normal pole of the converter station converts the power of the fault pole, the power can cause the current of the bridge arm of the converter station to rise, and when the current of the bridge arm of the converter station is larger than the overcurrent protection fixed value, the normal pole of the converter station can be blocked due to the overcurrent of the bridge arm, so that the new energy source is off-grid in a large area.
The application provides a method for controlling transmission power of an island system, as shown in fig. 1, comprising the following steps:
determining that a new energy true bipolar flexible direct island system fails, and acquiring an island system current signal and a power signal;
determining whether the island system fault is a monopole locking fault according to the current signal and the power signal, and determining the direct current voltage adjustable range of the island system converter station to be 1-1.299 p.u. according to the preset inverse time limit protection coefficient and the overcurrent time of the island system after determining that the island system is the monopole locking fault;
boosting the direct current voltage of the converter station of the island system in the adjustable range, reducing the direct current of the converter station to a preset range of 1-1.768 p.u., and after reducing the direct current of the converter station to the preset range, enabling the inverse time-limit protection of the direct current of the converter station to be inactive, and obtaining the normal pole power value of the converter station;
determining that the normal pole power value of the converter station is reduced and is reduced to the inflow power value of the converter station, stopping boosting the direct-current voltage of the converter station of the island system and stopping reducing the direct-current of the converter station, and recovering the direct-current voltage of the converter station of the island system to the reference voltage of the direct-current voltage of the converter station
The present application also provides a system 200 for controlling transmission power of an island system, as shown in fig. 2, including:
the parameter acquisition module 201 determines that a new energy true bipolar flexible straight island system fails and acquires an island system current signal and a power signal;
the fault judging module 202 is used for determining whether the island system fault is a monopole locking fault according to the current signal and the power signal, and acquiring the direct current voltage adjustable range of the island system converter station by 1-1.299 p.u. according to the preset inverse time limit protection coefficient and the overcurrent time of the island system after determining that the island system is the monopole locking fault;
the adjusting module 203 boosts the direct current voltage of the island system converter station in the adjustable range and reduces the direct current of the converter station to a preset range of 1-1.768 p.u., so that the inverse time limit protection of the direct current of the converter station is not operated, and the normal pole power value of the converter station is obtained;
the determining module 204 determines that the normal pole power value of the converter station is reduced and is reduced to the inflow power value of the converter station, stops boosting the dc voltage of the converter station of the island system and stopping reducing the dc current of the converter station, and restores the dc voltage of the converter station of the island system to the reference voltage of the dc voltage of the converter station.
The application has simple process and easy realization, and can realize the fault ride-through of the new energy unit of the island system economically and efficiently.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present application and not for limiting the same, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the application without departing from the spirit and scope of the application, which is intended to be covered by the claims.
Claims (10)
1. A method for controlling island system transmission power, the method comprising:
determining that a new energy true bipolar flexible direct island system fails, and acquiring an island system current signal and a power signal;
determining whether the island system fault is a monopole locking fault according to the current signal and the power signal, and determining the direct-current voltage adjustable range of the island system converter station according to the preset inverse time limit protection coefficient and the overcurrent time of the island system after determining that the island system is the monopole locking fault;
boosting the direct current voltage of the converter station of the island system in the adjustable range, reducing the direct current of the converter station to a preset range, and obtaining the normal pole power value of the converter station;
determining that the normal pole power value of the converter station is reduced and is reduced to the inflow power value of the converter station, stopping boosting the direct current voltage of the converter station of the island system and stopping reducing the direct current of the converter station;
the island system converter station direct current voltage is boosted in the adjustable range, the converter station direct current is reduced to a preset range, and the converter station normal pole power value is obtained, specifically: controlling the power of a normal pole of the converter station to carry out the conversion of the fault pole of the converter station, so as to boost the direct current voltage of the converter station in the adjustable range, and simultaneously reducing the bridge arm current of the converter station, so as to reduce the direct current of the converter station to a preset range;
when determining whether the island system fault is a unipolar blocking fault according to the current signal and the power signal, defining the island system converter station bridge arm current as an equation with independent variable of power P, wherein each power corresponds to the upper and lower bridge arm currents one by one, and the equation of power P is as follows:
when it is determined that an island system has a monopole latch-up fault, the power of the island system becomes P', and the formula is as follows:
P'＝P+VP
when the monopole locking occurs, the power rises to cause the rising of the bridge arm current, and the fan load shedding needs time, and the direct current voltage U is increased based on the allowable range of action protection after the fault occurs and during the period from the completion of the fan load shedding dc To the DC voltage protection limit U dcrpro In the case of (1), the rising of the bridge arm current caused by surplus power is greatly reduced, so that the maximum value of the bridge arm current is lower than the protection value i of bridge arm overcurrent protection armpro ；
When the island system is determined to have a monopole locking fault, the magnitudes of the bridge arm overcurrent protection value and the direct current voltage protection value are inversely proportional to time, and the formulas are as follows:
the boundary equation of the bridge arm current is as follows:
obtaining a boundary equation of the bridge arm current as a boundary condition to obtain the maximum power P born by the normal pole converter station max The formula is as follows:
according to the maximum power P max Determining the power reduction amount consumed by an island system under the control mode of the island system, wherein the power reduction amount is as follows:
Pcooper＝P+VP-Pmax＜VP
wherein, P is the surplus of the power which is surging when the fault happens and VP is the surplus of the transfer needed after the faultPower U dc To boost DC voltage, U dcrpro Protecting limit value, i for direct voltage armpro Protection value i for bridge arm overcurrent protection arm And U dc The current and the direct current voltage of the bridge arm of the converter station are used for normal operation of the converter station, and x and y are inverse time limit protection coefficients.
2. The method of claim 1, wherein the adjustable range is 1 to 1.299p.u.
3. The method of claim 1, wherein the predetermined range is 1 to 1.768p.u.
4. The method of claim 1, the method further comprising: and after the direct current of the converter station is reduced to a preset range, enabling the inverse time limit protection of the direct current of the converter station to be inactive.
5. The method of claim 1, the method further comprising: and after the normal pole power value of the converter station is determined to be reduced and reduced to the inflow power value of the converter station, the direct-current voltage of the converter station of the island system is recovered to the reference voltage of the direct-current voltage of the converter station.
6. A system for controlling island system transmission power, the system comprising:
the parameter acquisition module is used for determining that the new energy true bipolar flexible straight island system fails and acquiring an island system current signal and a power signal;
the fault judging module is used for determining whether the island system fault is a monopole locking fault according to the current signal and the power signal, and determining the direct-current voltage adjustable range of the island system converter station according to the preset inverse time limit protection coefficient and the overcurrent time of the island system after determining that the island system is the monopole locking fault;
the adjusting module is used for boosting the direct current voltage of the island system converter station in the adjustable range and reducing the direct current of the converter station to a preset range to obtain a normal pole power value of the converter station;
the judging module is used for determining that the normal pole power value of the converter station is reduced and is reduced to the inflow power value of the converter station, stopping boosting the direct-current voltage of the converter station of the island system and stopping reducing the direct-current of the converter station;
the island system converter station direct current voltage is boosted in the adjustable range, the converter station direct current is reduced to a preset range, and the converter station normal pole power value is obtained, specifically: controlling the power of a normal pole of the converter station to carry out the conversion of the fault pole of the converter station, so as to boost the direct current voltage of the converter station in the adjustable range, and simultaneously reducing the bridge arm current of the converter station, so as to reduce the direct current of the converter station to a preset range;
when determining whether the island system fault is a unipolar blocking fault according to the current signal and the power signal, defining the island system converter station bridge arm current as an equation with independent variable of power P, wherein each power corresponds to the upper and lower bridge arm currents one by one, and the equation of power P is as follows:
when it is determined that an island system has a monopole latch-up fault, the power of the island system becomes P', and the formula is as follows:
P'＝P+VP
when the monopole locking occurs, the power rises to cause the rising of the bridge arm current, and the fan load shedding needs time, and the direct current voltage U is increased based on the allowable range of action protection after the fault occurs and during the period from the completion of the fan load shedding dc To the DC voltage protection limit U dcrpro In the case of (1), the rising of the bridge arm current caused by surplus power is greatly reduced, so that the maximum value of the bridge arm current is lower than the protection value i of bridge arm overcurrent protection armpro ；
When the island system is determined to have a monopole locking fault, the magnitudes of the bridge arm overcurrent protection value and the direct current voltage protection value are inversely proportional to time, and the formulas are as follows:
the boundary equation of the bridge arm current is as follows:
obtaining a boundary equation of the bridge arm current as a boundary condition to obtain the maximum power P born by the normal pole converter station max The formula is as follows:
according to the maximum power P max Determining the power reduction amount consumed by an island system under the control mode of the island system, wherein the power reduction amount is as follows:
p cooper ＝P+VP-P max ＜VP
wherein, P is the power which is surging when not in fault, VP is the surplus power which needs to be transferred after fault, U dc To boost DC voltage, U dcrpro Protecting limit value, i for direct voltage armpro Protection value i for bridge arm overcurrent protection arm And U dc The current and the direct current voltage of the bridge arm of the converter station are used for normal operation of the converter station, and x and y are inverse time limit protection coefficients.
7. The system of claim 6, wherein the adjustable range is 1 to 1.299p.u.
8. The system of claim 6, wherein the predetermined range is 1 to 1.768p.u.
9. The system of claim 6, wherein the regulation module is configured to disable the converter station dc current inverse time-limit protection after reducing the converter station dc current to a predetermined range.
10. The system of claim 6, wherein the determining module is configured to restore the dc voltage of the island system converter station to the reference voltage of the dc voltage of the converter station after determining that the normal pole power value of the converter station has fallen and has fallen to the converter station inflow power value.
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