CN112072694A - Method and system for optimizing low voltage ride through control of wind turbine generator - Google Patents
Method and system for optimizing low voltage ride through control of wind turbine generator Download PDFInfo
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- CN112072694A CN112072694A CN202010722706.4A CN202010722706A CN112072694A CN 112072694 A CN112072694 A CN 112072694A CN 202010722706 A CN202010722706 A CN 202010722706A CN 112072694 A CN112072694 A CN 112072694A
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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
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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
- H02J2300/28—The renewable source being wind energy
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The invention discloses a method and a system for optimizing low voltage ride through control of a wind turbine generator, and belongs to the technical field of operation and control of power systems. The method comprises the following steps: calculating transient overvoltage of the wind turbine generator when alternating current and direct current faults occur according to the initial operation condition of the wind turbine generator of the power system; determining the influence of an adjustable factor on the transient overvoltage in the low voltage ride through process of the fan unit, and acquiring a key influence factor; and optimally controlling the low voltage ride through process of the wind turbine generator according to the key influence factors. According to the method, the influence mechanism of the low-voltage ride-through of the wind turbine generator on the transient overvoltage of the system is discussed by analyzing the active and reactive output characteristics of the wind turbine generator during the low-voltage ride-through period and in the recovery process, on the basis, the influences of different low-voltage ride-through performances on the power characteristics of the wind turbine generator and the transient overvoltage level of the system are contrastively analyzed, key influence factors are pointed out, and a low-voltage ride-through control optimization suggestion of the wind turbine generator is given.
Description
Technical Field
The present invention relates to the field of power system operation and control technology, and more particularly, to a method and system for optimizing wind turbine generator low voltage ride through control.
Background
With the continuous operation of an extra-high voltage direct current transmission project and a wind turbine generator, the transient overvoltage problem of a direct current transmitting end system and a wind power plant grid-connected point after the fault disturbance of an alternating current and direct current system becomes more and more prominent, and in the operation of an actual power grid, the transient overvoltage problem of the system becomes a direct influence factor which restricts the transmission capacity of the extra-high voltage direct current project and the on-grid power of the wind power plant, and the safety of a converter station and a near-area alternating current power grid device is seriously threaten. Therefore, the power characteristics of the extra-high voltage direct current and the wind power in the transient process need to be focused.
At present, the problem of the transient overvoltage of the system mainly focuses on the cause of the transient overvoltage caused by the dc fault, the estimation method of the transient overvoltage level, and the risk and countermeasure research of fan chain disconnection caused by the dc fault. However, the influence of the low voltage ride through performance of the wind turbine set on the access point and even the transient overvoltage of the system, especially the relation between different low voltage ride through characteristics of the wind turbine and the transient overvoltage level of the system, has been studied very little. Actual operation experience and a large number of power grid simulation results show that active/reactive characteristics of the wind turbine generator during and after fault ride-through are also direct factors causing transient voltage rise of a grid-connected point and a system, and under the condition that grid-connected wind power is high in power, the influence of the active/reactive characteristics on transient overvoltage of the system even exceeds the transient voltage rise level caused by surplus reactive power of a converter station filter after direct-current fault disturbance. In order to improve the cross-regional consumption capability of clean energy, China successively puts in operation and continuously builds multi-return-air fire bundling and outward-conveying extra-high voltage direct current projects, a large number of wind power supplies are configured in a near region of a transmitting-end converter station, wind power and direct current active/reactive characteristics are mutually superposed after a near region alternating current and direct current system fails, the transient overvoltage level of the system is sharply increased, and the safety of equipment is seriously threatened. In order to furthest improve the transmission capacity of the extra-high voltage direct current engineering and the on-grid power of the wind power plant, the optimization of the low-penetration characteristic of the wind turbine generator is urgently needed.
Disclosure of Invention
In order to solve the above problems, the present invention provides a method for optimizing low voltage ride through control of a wind turbine generator, comprising:
calculating transient overvoltage of the wind turbine generator when alternating current and direct current faults occur according to the initial operation condition of the wind turbine generator of the power system;
determining the influence of an adjustable factor on the transient overvoltage in the low voltage ride through process of the wind turbine generator, and acquiring a key influence factor;
and optimally controlling the low voltage ride through process of the wind turbine generator according to the key influence factors.
Optionally, the initial operating condition includes: direct current power, new energy internet power and a starting mode.
Optionally, adjustable factors including: the active level of the low-penetration zone, the reactive level of the low-penetration zone and the active recovery rate of the recovery zone.
Optionally, in the low voltage ride through process of the fan unit, the influence of the adjustable factor on the transient overvoltage is determined, specifically:
adjusting the active level of a low-penetration region, keeping the reactive level of the low-penetration region and the active recovery rate of a recovery region unchanged, and calculating transient overvoltage of the wind turbine generator under different active levels;
adjusting the reactive power level of the low-penetration region, keeping the active power level of the low-penetration region and the active power recovery rate of the recovery region unchanged, and calculating transient overvoltage of the wind turbine generator under different reactive power levels;
and adjusting the active recovery rate of the recovery area, keeping the reactive power level of the low-penetration area and the active power level of the low-penetration area unchanged, and calculating the transient overvoltage of the wind turbine generator under different active recovery rates.
Optionally, the optimal control of the low voltage ride through process of the wind turbine generator includes:
in the capacity adjustable range of the converter, according to key influence factors, active output and active power recovery rate of the wind turbine generator in the low-ride-through process are increased, and reactive output of the wind turbine generator in the low-ride-through process is reduced.
The invention also provides a system for optimizing the low voltage ride through control of the wind turbine generator, which comprises the following components:
the initial unit is used for calculating transient overvoltage of the wind turbine generator during alternating current and direct current faults according to the initial operation condition of the wind turbine generator of the power system;
the analysis unit is used for determining the influence of the adjustable factors on the transient overvoltage in the low-voltage ride through process of the wind turbine generator and acquiring key influence factors;
and the adjusting unit is used for optimally controlling the low voltage ride through process of the wind turbine generator according to key influence factors.
Optionally, the initial operating condition includes: direct current power, new energy internet power and a starting mode.
Optionally, adjustable factors including: the active level of the low-penetration zone, the reactive level of the low-penetration zone and the active recovery rate of the recovery zone.
Optionally, in the low voltage ride through process of the fan unit, the influence of the adjustable factor on the transient overvoltage is determined, specifically:
adjusting the active level of a low-penetration region, keeping the reactive level of the low-penetration region and the active recovery rate of a recovery region unchanged, and calculating transient overvoltage of the wind turbine generator under different active levels;
adjusting the reactive power level of the low-penetration region, keeping the active power level of the low-penetration region and the active power recovery rate of the recovery region unchanged, and calculating transient overvoltage of the wind turbine generator under different reactive power levels;
and adjusting the active recovery rate of the recovery area, keeping the reactive power level of the low-penetration area and the active power level of the low-penetration area unchanged, and calculating the transient overvoltage of the wind turbine generator under different active recovery rates.
Optionally, the optimal control of the low voltage ride through process of the wind turbine generator includes:
in the capacity adjustable range of the converter, according to key influence factors, active output and active power recovery rate of the wind turbine generator in the low-ride-through process are increased, and reactive output of the wind turbine generator in the low-ride-through process is reduced.
The invention discusses the influence mechanism of the low-voltage ride-through of the wind turbine generator on the transient overvoltage of the system by analyzing the active and reactive output characteristics of the wind turbine generator during the low-voltage ride-through period and the recovery process, contrasts and analyzes the influences of different low-voltage ride-through performances on the power characteristics of the wind turbine generator and the transient overvoltage level of the system on the basis, points out key influence factors, provides a low-voltage ride-through control optimization suggestion of the wind turbine generator, provides a feasibility suggestion of new energy grid-related characteristic optimization for large-scale new energy access to a power grid with serious transient overvoltage problems, and has good reference and guiding significance for the grid operation or the grid-connected operation of the new energy turbine generator.
Drawings
FIG. 1 is a flow chart of a method for optimizing wind turbine generator low voltage ride through control in accordance with the present invention;
FIG. 2 is a wind turbine low voltage ride through process for optimizing wind turbine low voltage ride through control according to a method of the present invention;
FIG. 3 is a schematic diagram of wind fire bundling and delivery according to an embodiment of the method for optimizing wind turbine generator low voltage ride through control;
FIG. 4 is a system architecture diagram for optimizing wind turbine generator low voltage ride through control according to the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention 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 invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those 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 invention provides a method for optimizing low voltage ride through control of a wind turbine generator, as shown in fig. 1, the method comprises the following steps:
calculating transient overvoltage of the wind turbine generator when alternating current and direct current faults occur according to the initial operation condition of the wind turbine generator of the power system;
determining the influence of an adjustable factor on the transient overvoltage in the low voltage ride through process of the wind turbine generator, and acquiring a key influence factor;
and optimally controlling the low voltage ride through process of the wind turbine generator according to the key influence factors.
Initial operating conditions, including: direct current power, new energy internet power and a starting mode.
As shown in fig. 2, the low voltage ride through process of the wind turbine includes a low-pass zone and a recovery zone, and therefore, the adjustable factors include: the active level of the low-penetration zone, the reactive level of the low-penetration zone and the active recovery rate of the recovery zone.
Determining the influence of adjustable factors on transient overvoltage in the low voltage ride through process of the fan unit, specifically:
adjusting the active level of a low-penetration region, keeping the reactive level of the low-penetration region and the active recovery rate of a recovery region unchanged, and calculating transient overvoltage of the wind turbine generator under different active levels;
adjusting the reactive power level of the low-penetration region, keeping the active power level of the low-penetration region and the active power recovery rate of the recovery region unchanged, and calculating transient overvoltage of the wind turbine generator under different reactive power levels;
and adjusting the active recovery rate of the recovery area, keeping the reactive power level of the low-penetration area and the active power level of the low-penetration area unchanged, and calculating the transient overvoltage of the wind turbine generator under different active recovery rates.
The method for optimally controlling the low voltage ride through process of the wind turbine generator comprises the following steps:
in the capacity adjustable range of the converter, according to key influence factors, active output and active power recovery rate of the wind turbine generator in the low-ride-through process are increased, and reactive output of the wind turbine generator in the low-ride-through process is reduced.
The invention is further illustrated by the following examples:
analyzing the influence of the active level of the low-penetration region on the transient overvoltage, and keeping the other two factors unchanged, wherein the reactive power control of the wind turbine during the low-penetration period is based on
Outputting, namely recovering the active power of a recovery area to a level before the fault according to the same rate, controlling different active power levels in a low-penetration period within the capacity range of the converter, and analyzing transient overvoltage during different active outputs;
analyzing the influence of the reactive level of the low-penetration area on the transient overvoltage, wherein other two factors are kept unchanged, the active power of the recovery area is recovered to the level before the fault at the same speed, the active power level of the fan is unchanged during the low-penetration period, the reactive output level of the low-penetration area of the wind turbine generator is changed by changing the proportional coefficient of the reactive current following the voltage drop, and the transient overvoltage during different reactive outputs is analyzed;
analyzing the influence of the active power recovery rate of the recovery area on the transient overvoltage, keeping other two factors unchanged, controlling the active power and reactive power levels of the fan to be unchanged during the low penetration period, recovering the active power of the recovery area to the level before the fault according to different rates, and analyzing the transient overvoltage at different active power recovery rates.
In the capacity range of the converter, active power output during low penetration is increased, reactive power output during low penetration of the fan is reduced, and the active power recovery rate is increased as much as possible.
As shown in fig. 3, the thermal power plant is composed of 2 1050 MW thermal power machines, the installed capacity of the wind power plant is 240MW, and the installed capacity of the wind power plant is composed of 160 1.5MW doubly-fed wind power machines, and the wind power and the fire bundled electric power are sent out through an HVDC-return and 500kV alternating-current line, wherein the length of the HVDC-return and 2-return alternating-current lines is about 200 km. In the following, the HVDC commutation failure fault is taken as an example for analysis, and the unit power factor is adopted for control when the wind power plant operates normally.
Simulation conditions are as follows: (1) the method is characterized in that a phase-change failure blocking fault occurs in the HVDC, a reactive current priority control strategy is adopted in the wind power plant, the voltage drop amplitude of the wind power plant is unchanged in the phase-change failure process, so that the output reactive power of the wind power plants in the low-pass area is basically consistent, the active power output in the low-pass area is controlled to be 10%, 20% and 30% of the initial level respectively in the capacity range of a converter, and the active power output in the low-pass area is recovered to the initial level at the rate of 1.5MW/s, the simulation result is shown in table 1, as can be seen from table 1, the lower the active power in the low-pass area is, the higher the transient voltage of each bus is, but the change amplitude is smaller, mainly because the wind power capacity and the power gear difference value are small (10% power difference value, namely 24MW), if the capacity of the wind power plant is increased, the transient voltage, within the converter capacity range, the more active power output during low-penetration control, the lower the system transient overvoltage level.
TABLE 1
(2) When the HVDC has a commutation failure blocking fault, the reactive output level of a low-pass area of the wind turbine generator is changed by changing the proportional coefficient of the reactive current following the voltage drop; the active power is set to be 30% of the initial level of the low penetration zone, the rate of 1.5MW/s is recovered, and the simulation result is shown in table 2, from table 2, it can be seen that, during high reactive power output, the voltage rise at the end of the fan is greater than that at the side of the converter station, and the transient voltage rise shows the trend that the fan, the grid-connected point and the converter station gradually decrease, which is also the same in table 1; during low reactive power output, fan machine end transient state pressure rise greatly reduced, the highest transient state pressure rise is wind-powered electricity generation field grid-connected point, the grid-connected point is because the idle surplus of converter station side and the idle combined action of low wearing of wind-powered electricity generation field side appear the highest pressure rise, if further reduce the idle output of fan when wearing down, then wind machine end transient state pressure rise will be minimum, and converter station transient state pressure rise will be the highest, therefore, wind turbine generator's low process of wearing, transient state overvoltage level after having aggravated the trouble, and the idle output of low wearing district wind power system is big more, the system transient state overvoltage is high more.
TABLE 2
(3) And (3) carrying out phase commutation failure blocking fault on the HVDC, controlling the active power of the fan in the low penetration period to be 30% of the initial level, and recovering the active power to the level before the fault according to the rates of 0.5MW/s, 1.5MW/s and 2.5MW/s respectively, wherein the simulation result is shown in table 3, and as can be seen from the table 3, the slower the active power is recovered, the higher the transient voltage of each bus is, but the relative change amplitude is smaller.
TABLE 3
The present invention further proposes a system 200 for optimizing wind turbine generator set low voltage ride through control, as shown in fig. 4, comprising:
the initial unit 201 is used for calculating transient overvoltage of the wind turbine generator during alternating current and direct current faults according to the initial operation condition of the wind turbine generator of the power system;
the analysis unit 202 is used for determining the influence of the adjustable factors on the transient overvoltage in the low voltage ride through process of the wind turbine generator and acquiring key influence factors;
and the adjusting unit 203 is used for optimally controlling the low voltage ride through process of the wind turbine generator according to the key influence factors.
Initial operating conditions, including: direct current power, new energy internet power and a starting mode.
Adjustable factors including: the active level of the low-penetration zone, the reactive level of the low-penetration zone and the active recovery rate of the recovery zone.
Determining the influence of adjustable factors on transient overvoltage in the low voltage ride through process of the fan unit, specifically:
adjusting the active level of a low-penetration region, keeping the reactive level of the low-penetration region and the active recovery rate of a recovery region unchanged, and calculating transient overvoltage of the wind turbine generator under different active levels;
adjusting the reactive power level of the low-penetration region, keeping the active power level of the low-penetration region and the active power recovery rate of the recovery region unchanged, and calculating transient overvoltage of the wind turbine generator under different reactive power levels;
and adjusting the active recovery rate of the recovery area, keeping the reactive power level of the low-penetration area and the active power level of the low-penetration area unchanged, and calculating the transient overvoltage of the wind turbine generator under different active recovery rates.
The method for optimally controlling the low voltage ride through process of the wind turbine generator comprises the following steps:
in the capacity adjustable range of the converter, according to key influence factors, active output and active power recovery rate of the wind turbine generator in the low-ride-through process are increased, and reactive output of the wind turbine generator in the low-ride-through process is reduced.
The invention discusses the influence mechanism of the low-voltage ride-through of the wind turbine generator on the transient overvoltage of the system by analyzing the active and reactive output characteristics of the wind turbine generator during the low-voltage ride-through period and the recovery process, contrasts and analyzes the influences of different low-voltage ride-through performances on the power characteristics of the wind turbine generator and the transient overvoltage level of the system on the basis, points out key influence factors, provides a low-voltage ride-through control optimization suggestion of the wind turbine generator, provides a feasibility suggestion of new energy grid-related characteristic optimization for large-scale new energy access to a power grid with serious transient overvoltage problems, and has good reference and guiding significance for the grid operation or the grid-connected operation of the new energy turbine generator.
As will be appreciated by one skilled in the art, 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 scheme in the embodiment of the application can be implemented by adopting various computer languages, such as object-oriented programming language Java and transliterated scripting language JavaScript.
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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A method for optimizing wind turbine low voltage ride through control, the method comprising:
calculating transient overvoltage of the wind turbine generator when alternating current and direct current faults occur according to the initial operation condition of the wind turbine generator of the power system;
determining the influence of an adjustable factor on the transient overvoltage in the low voltage ride through process of the wind turbine generator, and acquiring a key influence factor;
and optimally controlling the low voltage ride through process of the wind turbine generator according to the key influence factors.
2. The method of claim 1, the initial operating condition comprising: direct current power, new energy internet power and a starting mode.
3. The method of claim 1, the adjustable factor, comprising: the active level of the low-penetration zone, the reactive level of the low-penetration zone and the active recovery rate of the recovery zone.
4. The method according to claim 1, wherein the influence of an adjustable factor on the transient overvoltage during the low voltage ride through of the fan unit is determined, and specifically comprises:
adjusting the active level of a low-penetration region, keeping the reactive level of the low-penetration region and the active recovery rate of a recovery region unchanged, and calculating transient overvoltage of the wind turbine generator under different active levels;
adjusting the reactive power level of the low-penetration region, keeping the active power level of the low-penetration region and the active power recovery rate of the recovery region unchanged, and calculating transient overvoltage of the wind turbine generator under different reactive power levels;
and adjusting the active recovery rate of the recovery area, keeping the reactive power level of the low-penetration area and the active power level of the low-penetration area unchanged, and calculating the transient overvoltage of the wind turbine generator under different active recovery rates.
5. The method according to claim 1, wherein the optimal control of the low voltage ride through process of the wind turbine generator comprises:
in the capacity adjustable range of the converter, according to key influence factors, active output and active power recovery rate of the wind turbine generator in the low-ride-through process are increased, and reactive output of the wind turbine generator in the low-ride-through process is reduced.
6. A system for optimizing wind turbine low voltage ride through control, the system comprising:
the initial unit is used for calculating transient overvoltage of the wind turbine generator during alternating current and direct current faults according to the initial operation condition of the wind turbine generator of the power system;
the analysis unit is used for determining the influence of the adjustable factors on the transient overvoltage in the low-voltage ride through process of the wind turbine generator and acquiring key influence factors;
and the adjusting unit is used for optimally controlling the low voltage ride through process of the wind turbine generator according to key influence factors.
7. The system of claim 6, the initial operating condition comprising: direct current power, new energy internet power and a starting mode.
8. The system of claim 6, the adjustable factor, comprising: the active level of the low-penetration zone, the reactive level of the low-penetration zone and the active recovery rate of the recovery zone.
9. The system according to claim 6, wherein the influence of the adjustable factor on the transient overvoltage during the determination of the low voltage ride through of the fan unit is specifically:
adjusting the active level of a low-penetration region, keeping the reactive level of the low-penetration region and the active recovery rate of a recovery region unchanged, and calculating transient overvoltage of the wind turbine generator under different active levels;
adjusting the reactive power level of the low-penetration region, keeping the active power level of the low-penetration region and the active power recovery rate of the recovery region unchanged, and calculating transient overvoltage of the wind turbine generator under different reactive power levels;
and adjusting the active recovery rate of the recovery area, keeping the reactive power level of the low-penetration area and the active power level of the low-penetration area unchanged, and calculating the transient overvoltage of the wind turbine generator under different active recovery rates.
10. The system of claim 6, wherein the optimal control of the low voltage ride through process of the wind turbine comprises:
in the capacity adjustable range of the converter, according to key influence factors, active output and active power recovery rate of the wind turbine generator in the low-ride-through process are increased, and reactive output of the wind turbine generator in the low-ride-through process is reduced.
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| CN113872230A (en) * | 2021-09-24 | 2021-12-31 | 中国电力科学研究院有限公司 | New energy fault ride-through control parameter optimization method and device |
| CN114285079A (en) * | 2021-12-29 | 2022-04-05 | 国网青海省电力公司经济技术研究院 | Method and system for quickly estimating transient overvoltage caused by alternating current-direct current fault disturbance |
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| CN113872230A (en) * | 2021-09-24 | 2021-12-31 | 中国电力科学研究院有限公司 | New energy fault ride-through control parameter optimization method and device |
| CN113872230B (en) * | 2021-09-24 | 2023-10-20 | 中国电力科学研究院有限公司 | New energy fault ride-through control parameter optimization method and device |
| CN114285079A (en) * | 2021-12-29 | 2022-04-05 | 国网青海省电力公司经济技术研究院 | Method and system for quickly estimating transient overvoltage caused by alternating current-direct current fault disturbance |
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