CN112072694B - 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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- CN112072694B CN112072694B CN202010722706.4A CN202010722706A CN112072694B CN 112072694 B CN112072694 B CN 112072694B CN 202010722706 A CN202010722706 A CN 202010722706A CN 112072694 B CN112072694 B CN 112072694B
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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
-
- 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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- Control Of Eletrric Generators (AREA)
Abstract
The application discloses a method and a system for optimizing low-voltage ride through control of a wind turbine, and belongs to the technical field of operation and control of power systems. The method of the application comprises the following steps: according to the initial operation condition of the wind turbine generator system of the power system, calculating transient overvoltage of the wind turbine generator system during AC/DC faults; determining the influence of adjustable factors on transient overvoltage in the low voltage ride through process of the wind turbine unit, and acquiring key influence factors; and optimally controlling the low-voltage ride through process of the wind turbine generator according to key influence factors. According to the application, the influence mechanism of 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, the influence of different low-voltage ride-through performances on the power characteristics of the wind turbine generator and on the transient overvoltage level of the system is compared and analyzed on the basis, key influence factors are pointed out, and the low-voltage ride-through control optimization suggestion of the wind turbine generator is provided.
Description
Technical Field
The application relates to the technical field of operation and control of power systems, in particular to a method and a system for optimizing low-voltage ride through control of a wind turbine.
Background
With continuous operation of the extra-high voltage direct current transmission project and the wind turbine generator, the transient overvoltage problem of the direct current transmission end system and the wind farm grid connection point after the fault disturbance of the alternating current and direct current system is more and more prominent, and in actual power grid operation, the transient overvoltage problem of the system becomes a direct influence factor for restricting the transmission capacity of the extra-high voltage direct current project and the internet power of the wind farm, and seriously threatens the safety of the converter station and the near-area alternating current power grid equipment. Therefore, the power characteristics of the extra-high voltage direct current and wind power in the transient process need to be focused.
At present, the problem of transient overvoltage aiming at a system is mainly focused on the reason of transient overvoltage caused by direct current faults, an estimation method of the transient overvoltage level, and the risk and countermeasure research of fan chain off-grid caused by the direct current faults. However, little research has been done regarding the impact of the low voltage ride through performance of the blower unit itself on access points and even system transient overvoltage, especially regarding the relationship between the different low voltage ride through characteristics of the blower and the system transient overvoltage levels. The actual operation experience and a large number of power grid simulation results show that the active/reactive characteristics of the wind turbine generator during and after the fault ride-through period are also direct factors for causing transient voltage rise of grid-connected points and systems, and under the condition of higher grid-connected wind power, the influence of the active/reactive characteristics on the transient overvoltage of the systems even exceeds the transient voltage rise level caused by surplus and reactive power of the filters of the converter stations after the disturbance of the direct current fault. In order to improve the transregional capacity of clean energy, the system is put into operation sequentially and continuously to construct multi-return fire bundling-type extra-high voltage direct current engineering, a large number of wind power supplies are arranged in a near-region of a sending-end converter station, wind power and direct current active/reactive characteristics are mutually overlapped after an alternating current-direct current system in the near-region fails, and the transient overvoltage level of the system is increased sharply, so that the safety of equipment is seriously threatened. In order to improve the transmission capacity of the extra-high voltage direct current engineering and the internet surfing power of a wind power plant to the greatest extent, development of optimization of low-pass characteristics of wind turbines is needed.
Disclosure of Invention
In order to solve the above problems, the present application provides a method for optimizing low voltage ride through control of a wind turbine generator, including:
according to the initial operation condition of the wind turbine generator system of the power system, calculating transient overvoltage of the wind turbine generator system during AC/DC faults;
determining the influence of adjustable factors on transient overvoltage in the low-voltage ride through process of the wind turbine generator, and acquiring key influence factors;
and 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 surfing power and a starting mode.
Optionally, the adjustable factors include: low pass active level, low pass reactive level and recovery zone active recovery rate.
Optionally, in the process of determining low voltage ride through of the wind turbine unit, the influence of the adjustable factor on the transient overvoltage is specifically:
the active level of the low-pass region is regulated, the reactive level of the low-pass region and the active recovery rate of the recovery region are kept unchanged, and transient overvoltage of the wind turbine generator under different active levels is calculated;
the reactive power level of the low-pass region is regulated, the active power level of the low-pass region and the active recovery rate of the recovery region are kept unchanged, and transient overvoltage of the wind turbine generator under different reactive power levels is calculated;
and adjusting the active recovery rate of the recovery area, keeping the reactive power level of the low-penetration area and the active level of the low-penetration area unchanged, and calculating transient overvoltage of the wind turbine generator under different active recovery rates.
Optionally, the optimizing control of the low voltage ride through process of the wind turbine generator includes:
and in the capacity adjustable range of the converter, according to key influence factors, increasing the active output in the low-pass process of the wind turbine, increasing the active power recovery rate and reducing the reactive output in the low-pass process of the wind turbine.
The application also provides a system for optimizing the low-voltage ride through control of the wind turbine, which comprises:
the initial unit is used for calculating transient overvoltage of the wind turbine generator set during AC/DC faults according to the initial operation condition of the wind turbine generator set of the power system;
the analysis unit is used for determining the influence of adjustable factors on 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 surfing power and a starting mode.
Optionally, the adjustable factors include: low pass active level, low pass reactive level and recovery zone active recovery rate.
Optionally, in the process of determining low voltage ride through of the wind turbine unit, the influence of the adjustable factor on the transient overvoltage is specifically:
the active level of the low-pass region is regulated, the reactive level of the low-pass region and the active recovery rate of the recovery region are kept unchanged, and transient overvoltage of the wind turbine generator under different active levels is calculated;
the reactive power level of the low-pass region is regulated, the active power level of the low-pass region and the active recovery rate of the recovery region are kept unchanged, and transient overvoltage of the wind turbine generator under different reactive power levels is calculated;
and adjusting the active recovery rate of the recovery area, keeping the reactive power level of the low-penetration area and the active level of the low-penetration area unchanged, and calculating transient overvoltage of the wind turbine generator under different active recovery rates.
Optionally, the optimizing control of the low voltage ride through process of the wind turbine generator includes:
and in the capacity adjustable range of the converter, according to key influence factors, increasing the active output in the low-pass process of the wind turbine, increasing the active power recovery rate and reducing the reactive output in the low-pass process of the wind turbine.
According to the application, the influence mechanism of low-voltage crossing of the wind turbine on the transient overvoltage of the system is discussed by analyzing the active and reactive output characteristics of the wind turbine during the low-voltage crossing period and in the recovery process, the influence of different low-voltage crossing performances on the power characteristics of the wind turbine and on the transient overvoltage level of the system is compared and analyzed on the basis, key influence factors are pointed out, low-voltage crossing control optimization suggestions of the wind turbine are provided, a feasible suggestion of new energy grid-related characteristic optimization is provided for large-scale new energy access power grids with serious transient overvoltage problems, and the method has good reference and guidance significance for power grid operation or new energy grid-connected operation.
Drawings
FIG. 1 is a flow chart of a method for optimizing low voltage ride through control of a wind turbine according to the present application;
FIG. 2 illustrates a low voltage ride through process of a wind turbine for optimizing low voltage ride through control of the wind turbine in accordance with the present application;
FIG. 3 is a schematic diagram of wind-fire bundling and delivery of an embodiment of a method for optimizing low-voltage ride through control of a wind turbine generator;
FIG. 4 is a system architecture diagram for optimizing low voltage ride through control of a wind turbine generator.
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 application provides a method for optimizing low-voltage ride through control of a wind turbine, as shown in fig. 1, comprising the following steps:
according to the initial operation condition of the wind turbine generator system of the power system, calculating transient overvoltage of the wind turbine generator system during AC/DC faults;
determining the influence of adjustable factors on transient overvoltage in the low-voltage ride through process of the wind turbine generator, and acquiring key influence factors;
and optimally controlling the low-voltage ride through process of the wind turbine generator according to key influence factors.
Initial operating conditions, including: direct current power, new energy internet surfing power and a starting mode.
As shown in fig. 2, the low voltage ride through process of the wind turbine includes a low-voltage ride through region and a recovery region, so that adjustable factors can be known, including: low pass active level, low pass reactive level and recovery zone active recovery rate.
In the low voltage ride through process of the wind turbine unit, the influence of the adjustable factors on the transient overvoltage is determined, specifically:
the active level of the low-pass region is regulated, the reactive level of the low-pass region and the active recovery rate of the recovery region are kept unchanged, and transient overvoltage of the wind turbine generator under different active levels is calculated;
the reactive power level of the low-pass region is regulated, the active power level of the low-pass region and the active recovery rate of the recovery region are kept unchanged, and transient overvoltage of the wind turbine generator under different reactive power levels is calculated;
and adjusting the active recovery rate of the recovery area, keeping the reactive power level of the low-penetration area and the active level of the low-penetration area unchanged, and calculating 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:
and in the capacity adjustable range of the converter, according to key influence factors, increasing the active output in the low-pass process of the wind turbine, increasing the active power recovery rate and reducing the reactive output in the low-pass process of the wind turbine.
The application is further illustrated by the following examples:
analyzing the influence of the active level of the low penetration region on the transient overvoltage, wherein the other two factors remain unchanged, wherein wind powerReactive power control basis during low-load operation of a unitOutputting, wherein the active power of the recovery area is recovered to the pre-fault level according to the same rate, different active power levels during low-pass are controlled within the capacity range of the converter, and transient overvoltage at different active outputs is analyzed;
analyzing the influence of the reactive power level of the low-penetration area on the transient overvoltage, keeping the other two factors unchanged, wherein the active power of the recovery area is recovered to the pre-fault level at the same speed, the active power level of the fan is unchanged during the low-penetration period, changing the reactive power output level of the low-penetration area of the wind turbine by changing the proportionality coefficient of the reactive current following the voltage drop, and analyzing the transient overvoltage at different reactive power outputs;
and analyzing the influence of the active recovery rate of the recovery area on the transient overvoltage, keeping the other two factors unchanged, controlling the active and reactive power levels of the fan to be unchanged during low-pass period, recovering the active power of the recovery area to the pre-fault level according to different rates, and analyzing the transient overvoltage at different active power recovery rates.
In the capacity range of the converter, the active power output during low-pass is increased, the reactive power output of the fan during low-pass 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 1 050MW fire motors, the installed capacity of the wind power plant is 240MW, the installed capacity of the wind power plant is composed of 160 1.5MW double-fed wind power plants, wind fire bundling power is sent out through a primary-loop HVDC and a secondary-loop 500kV alternating current line through a tertiary boost access system, wherein the HVDC power is 2 000MW, and the length of the secondary-loop alternating current line is about 200km. The analysis is performed by taking the HVDC commutation failure fault as an example, and unit power factor control is adopted when the wind farm normally operates.
Simulation conditions: (1) The wind power plant adopts a reactive current priority control strategy, and as the voltage drop amplitude of the wind power plant is unchanged in the commutation failure process, the output reactive power of the wind power plant in the low-pass region is basically consistent, the active power output in the low-pass region is controlled to be respectively 10%, 20% and 30% of the initial level in the capacity range of the converter, and is restored to the initial level at the rate of 1.5MW/s, simulation results are shown in table 1, and as the active power in the low-pass region is lower, the transient voltage of each bus is higher, but the variation amplitude is smaller, mainly because the calculated wind power capacity and the power gear difference value are small (10% power difference value, namely 24 MW), if the capacity of the wind power plant is increased, the transient voltage difference between different active control levels is increased, and as the active power control in the low-pass region can influence the transient overvoltage level of the system, and the transient overvoltage level of the system is lower as the active power output in the low-pass region is controlled in the capacity range of the converter.
TABLE 1
(2) The HVDC has commutation failure blocking faults, and the reactive output level of a low-penetration area of the wind turbine generator is changed by changing the proportional coefficient of reactive current following voltage drop; the active power is set to be 30% of the initial level of the low pass zone, the speed of 1.5MW/s is recovered, the simulation result is shown in table 2, from 2, it can be seen that the voltage rise of the machine end of the fan is larger than that of the converter station side when the reactive power is output, and the transient voltage rise shows the trend that the fan, the grid connection point and the converter station are gradually reduced, and the same is true in table 1; when the reactive power output is low, the transient voltage rise of the wind turbine end is greatly reduced, the highest transient voltage rise is the grid-connected point of the wind power plant, namely, the grid-connected point generates the highest voltage rise due to the combined action of reactive power surplus at the side of the converter station and low-pass reactive power at the side of the wind power plant, if the reactive power output when the wind turbine is low-pass is further reduced, the transient voltage rise of the wind turbine end is minimum, and the transient voltage rise of the converter station is highest, so that the low-pass process of the wind turbine set aggravates the transient overvoltage level after faults, and the larger the reactive power output of the wind power system in the low-pass region is, the higher the transient overvoltage of the system is.
TABLE 2
(3) The active power of the fan is controlled to be 30% of the initial level and is recovered to the pre-fault level according to the rates of 0.5MW/s, 1.5MW/s and 2.5MW/s during the low-pass period when the HVDC fails to lock out faults, simulation results are shown in table 3, and as can be seen from table 3, the slower the active power recovery, the higher the transient voltage of each busbar is, but the smaller the relative change amplitude is.
TABLE 3 Table 3
The application also provides a system 200 for optimizing low voltage ride through control of a wind turbine, as shown in fig. 4, comprising:
the initial unit 201 calculates transient overvoltage of the wind turbine generator in the AC/DC fault according to the initial operation condition of the wind turbine generator in the power system;
the analysis unit 202 is used for determining the influence of adjustable factors on transient overvoltage in the low-voltage ride through process of the wind turbine generator and acquiring key influence factors;
and the adjusting unit 203 optimally controls the low voltage ride through process of the wind turbine generator according to key influence factors.
Initial operating conditions, including: direct current power, new energy internet surfing power and a starting mode.
Adjustable factors, including: low pass active level, low pass reactive level and recovery zone active recovery rate.
In the low voltage ride through process of the wind turbine unit, the influence of the adjustable factors on the transient overvoltage is determined, specifically:
the active level of the low-pass region is regulated, the reactive level of the low-pass region and the active recovery rate of the recovery region are kept unchanged, and transient overvoltage of the wind turbine generator under different active levels is calculated;
the reactive power level of the low-pass region is regulated, the active power level of the low-pass region and the active recovery rate of the recovery region are kept unchanged, and transient overvoltage of the wind turbine generator under different reactive power levels is calculated;
and adjusting the active recovery rate of the recovery area, keeping the reactive power level of the low-penetration area and the active level of the low-penetration area unchanged, and calculating 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:
and in the capacity adjustable range of the converter, according to key influence factors, increasing the active output in the low-pass process of the wind turbine, increasing the active power recovery rate and reducing the reactive output in the low-pass process of the wind turbine.
According to the application, the influence mechanism of low-voltage crossing of the wind turbine on the transient overvoltage of the system is discussed by analyzing the active and reactive output characteristics of the wind turbine during the low-voltage crossing period and in the recovery process, the influence of different low-voltage crossing performances on the power characteristics of the wind turbine and on the transient overvoltage level of the system is compared and analyzed on the basis, key influence factors are pointed out, low-voltage crossing control optimization suggestions of the wind turbine are provided, a feasible suggestion of new energy grid-related characteristic optimization is provided for large-scale new energy access power grids with serious transient overvoltage problems, and the method has good reference and guidance significance for power grid operation or new energy grid-connected operation.
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 scheme in the embodiment of the application can be realized by adopting various computer languages, such as object-oriented programming language Java, an transliteration script language JavaScript and the like.
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.
While 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. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (2)
1. A method for optimizing low voltage ride through control of a wind turbine, the method comprising:
according to the initial operation condition of the wind turbine generator system of the power system, calculating transient overvoltage of the wind turbine generator system during AC/DC faults;
determining the influence of adjustable factors on transient overvoltage in the low-voltage ride through process of the wind turbine generator, and acquiring key influence factors;
according to key influence factors, the low voltage ride through process of the wind turbine generator is optimally controlled;
the initial operating conditions include: direct current power, new energy internet surfing power and a starting mode;
the adjustable factors include: low pass active level, low pass reactive level and recovery zone active recovery rate;
in the process of determining the low voltage ride through of the wind turbine unit, the influence of the adjustable factors on the transient overvoltage is specifically as follows:
the active level of the low-pass region is regulated, the reactive level of the low-pass region and the active recovery rate of the recovery region are kept unchanged, and transient overvoltage of the wind turbine generator under different active levels is calculated;
the reactive power level of the low-pass region is regulated, the active power level of the low-pass region and the active recovery rate of the recovery region are kept unchanged, and transient overvoltage of the wind turbine generator under different reactive power levels is calculated;
the active recovery rate of the recovery area is regulated, the reactive power level of the low-pass area and the active power level of the low-pass area are kept unchanged, and transient overvoltage of the wind turbine generator under different active recovery rates is calculated;
the optimizing control of the low voltage ride through process of the wind turbine generator comprises the following steps:
and in the capacity adjustable range of the converter, according to key influence factors, increasing the active output in the low-pass process of the wind turbine, increasing the active power recovery rate and reducing the reactive output in the low-pass process of the wind turbine.
2. A system for optimizing low voltage ride through control of a wind turbine, the system comprising:
the initial unit is used for calculating transient overvoltage of the wind turbine generator set during AC/DC faults according to the initial operation condition of the wind turbine generator set of the power system;
the analysis unit is used for determining the influence of adjustable factors on transient overvoltage in the low-voltage ride through process of the wind turbine generator and acquiring key influence factors;
the adjusting unit is used for optimally controlling the low-voltage ride through process of the wind turbine generator according to key influence factors;
the initial operating conditions include: direct current power, new energy internet surfing power and a starting mode;
the adjustable factors include: low pass active level, low pass reactive level and recovery zone active recovery rate;
in the process of determining the low voltage ride through of the wind turbine unit, the influence of the adjustable factors on the transient overvoltage is specifically as follows:
the active level of the low-pass region is regulated, the reactive level of the low-pass region and the active recovery rate of the recovery region are kept unchanged, and transient overvoltage of the wind turbine generator under different active levels is calculated;
the reactive power level of the low-pass region is regulated, the active power level of the low-pass region and the active recovery rate of the recovery region are kept unchanged, and transient overvoltage of the wind turbine generator under different reactive power levels is calculated;
the active recovery rate of the recovery area is regulated, the reactive power level of the low-pass area and the active power level of the low-pass area are kept unchanged, and transient overvoltage of the wind turbine generator under different active recovery rates is calculated;
the optimizing control of the low voltage ride through process of the wind turbine generator comprises the following steps:
and in the capacity adjustable range of the converter, according to key influence factors, increasing the active output in the low-pass process of the wind turbine, increasing the active power recovery rate and reducing the reactive output in the low-pass process of the wind turbine.
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| CN112072694A (en) | 2020-12-11 |
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