CN114256883A - Control method and device for double-fed wind turbine generator and electronic equipment - Google Patents

Control method and device for double-fed wind turbine generator and electronic equipment Download PDF

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Publication number
CN114256883A
CN114256883A CN202111415873.5A CN202111415873A CN114256883A CN 114256883 A CN114256883 A CN 114256883A CN 202111415873 A CN202111415873 A CN 202111415873A CN 114256883 A CN114256883 A CN 114256883A
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converter
voltage
current
acquiring
reactive
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CN114256883B (en
Inventor
张俊杰
焦冲
林伟荣
蔡安民
郑茹心
金强
杨博宇
李力森
蔺雪峰
李媛
张林伟
许扬
郑磊
袁晓旭
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Huaneng Clean Energy Research Institute
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Huaneng Clean Energy Research Institute
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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
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/007—Control circuits for doubly fed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
    • H02P9/105—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load for increasing the stability
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The application provides a control method of a double-fed wind turbine generator, which comprises the following steps: acquiring a grid-connected point voltage of the wind turbine generator, acquiring a voltage amplitude of a converter group corresponding to the wind turbine generator according to the grid-connected point voltage, acquiring a rated voltage of the wind turbine generator, and acquiring a voltage threshold corresponding to a low-voltage ride-through state according to the rated voltage; controlling the converter group to enter a low voltage ride through state in response to the voltage amplitude being smaller than the voltage threshold; and acquiring a first reactive current output quantity of the first converter to control the first converter to perform reactive output according to the first reactive current output quantity, and acquiring a second reactive current output quantity of the second converter to control the second converter to perform reactive output according to the second reactive current output quantity. The reactive output capability of the converter group can be coordinately controlled during voltage dropping, the reactive current response time is shortened, the voltage recovery of a power grid can be quickly supported, and the safety and the reliability of a power system are guaranteed.

Description

Control method and device for double-fed wind turbine generator and electronic equipment
Technical Field
The invention relates to the technical field of power generation, in particular to a control method and device of a double-fed wind turbine generator and electronic equipment.
Background
At present, wind turbines are widely applied to power generation, wherein low voltage ride through capability becomes a technical index which must be achieved by a wind power plant in order to guarantee safety and reliability of a power system. The related regulations (standards) also provide specific requirements for the fault voltage ride-through capability of the wind turbine generator, and the standards not only require that the wind turbine generator has the capability of continuous operation without disconnection when the voltage of a power grid drops, but also need to provide reactive current for the system to support the voltage recovery of the system.
However, in the related art, the current low-penetration reactive power output control strategy of the doubly-fed wind turbine generator often adopts a machine-side converter to control the generator to output reactive power. However, the doubly-fed wind power generator stator is directly connected with the power grid, so that the response time of the low-penetration dynamic reactive current is very difficult to meet the standard index.
Therefore, how to achieve the coordination control of the reactive output capability of the machine-side converter and the grid-side converter during the voltage drop, shorten the reactive current response time, and quickly support the voltage recovery of the power grid becomes a problem to be solved urgently.
Disclosure of Invention
The application provides a control method of a double-fed wind turbine generator set, which is used for realizing coordination control of the reactive output capacity of a converter set during voltage drop, shortening the reactive current response time, quickly supporting the voltage recovery of a power grid and guaranteeing the safety and reliability of a power system.
According to a first aspect of the application, a method for controlling a doubly-fed wind turbine generator is provided, which includes: acquiring a grid-connected point voltage of a wind turbine generator, and acquiring a voltage amplitude of a converter group corresponding to the wind turbine generator according to the grid-connected point voltage, wherein the converter group comprises a first converter and a second converter; acquiring rated voltage of the wind turbine generator, and acquiring a voltage threshold corresponding to a low voltage ride through state according to the rated voltage; in response to the voltage magnitude being less than the voltage threshold, controlling the set of converters to enter the low voltage ride through state; and acquiring a first reactive current output quantity of the first converter to control the first converter to perform reactive output according to the first reactive current output quantity, and acquiring a second reactive current output quantity of the second converter to control the second converter to perform reactive output according to the second reactive current output quantity.
In addition, the control method for the doubly-fed wind turbine generator according to the above embodiment of the present application may further have the following additional technical features:
according to an embodiment of the present application, the obtaining a voltage threshold corresponding to a low voltage ride through state according to the rated voltage includes: and acquiring a preset target coefficient, and taking the product of the rated voltage and the target coefficient as the voltage threshold.
According to an embodiment of the present application, the obtaining a voltage amplitude of a converter group corresponding to the wind turbine generator according to the grid-connected point voltage includes: and acquiring a first voltage amplitude of the first converter and a second voltage amplitude of the second converter according to the grid-connected point voltage.
According to an embodiment of the present application, the obtaining a rated voltage of the wind turbine generator and obtaining a voltage threshold corresponding to a low voltage ride through state according to the rated voltage includes: acquiring a first rated voltage of the first converter, and acquiring a first voltage threshold value aiming at the first converter according to the first rated voltage; and acquiring a second rated voltage of the second converter, and acquiring a second voltage threshold value aiming at the second converter according to the second rated voltage.
According to an embodiment of the present application, the obtaining of the first reactive current output quantity of the first converter includes: acquiring a current voltage per unit value of the wind turbine generator and a rated current of the wind turbine generator; acquiring a first reactive output coefficient according to the rated current of the wind turbine generator; and acquiring the first reactive current output quantity according to the current voltage per unit value, the rated current of the wind turbine generator and the first reactive output coefficient.
According to an embodiment of the present application, the obtaining the second reactive current output quantity of the second converter includes: acquiring a current voltage per unit value of the wind turbine generator and a rated current of the second converter; acquiring a second reactive output coefficient according to the rated current of the second converter; and acquiring the second reactive current output quantity according to the current voltage per unit value, the rated current of the second converter and the second reactive output coefficient.
According to an embodiment of the present application, the control method further includes: and the total reactive current output quantity of the converter group is the sum of the first reactive current output quantity and the second reactive current output quantity.
According to an embodiment of the present application, before controlling the first converter to perform reactive power output according to the first reactive current output amount, the method further includes: the method comprises the steps of obtaining a first bridge current of a first current transformer, and determining that the first bridge current is smaller than a preset first blocking pulse current threshold value.
According to an embodiment of the present application, the control method further includes: and controlling the blocking pulse of the first converter in response to the fact that the current of the first bridge circuit is larger than or equal to the current threshold value of the first blocking pulse until the blocking pulse of the first converter reaches a first preset duration.
According to an embodiment of the present application, before controlling the second converter to perform reactive power output according to the second reactive current output quantity, the method further includes: and acquiring a second bridge current of the second current transformer, and determining that the second bridge current is smaller than a preset second blocking pulse current threshold. In addition, the first and second substrates are,
according to an embodiment of the present application, the control method further includes: and controlling the blocking pulse of the second converter in response to the second bridge circuit current being greater than or equal to the second blocking pulse current threshold value until the blocking pulse of the second converter reaches a second preset duration.
According to a second aspect of the present application, there is provided a control apparatus for a doubly-fed wind turbine, comprising: the wind turbine generator system comprises a first acquisition module, a second acquisition module and a control module, wherein the first acquisition module is used for acquiring a grid-connected point voltage of a wind turbine generator and acquiring a voltage amplitude of a converter group corresponding to the wind turbine generator according to the grid-connected point voltage, and the converter group comprises a first converter and a second converter; the second acquisition module is used for acquiring the rated voltage of the wind turbine generator and acquiring a voltage threshold corresponding to a low-voltage ride-through state according to the rated voltage; the first control module is used for responding to the condition that the voltage amplitude is smaller than the voltage threshold value, and controlling the converter group to enter the low-voltage ride-through state; the second control module is used for obtaining a first reactive current output quantity of the first converter to control the first converter to perform reactive power output according to the first reactive current output quantity, and obtaining a second reactive current output quantity of the second converter to control the second converter to perform reactive power output according to the second reactive current output quantity.
According to the control device of the doubly-fed wind turbine generator set in the above embodiment of the present application, the following additional technical features may also be provided:
according to an embodiment of the present application, the second obtaining module is further configured to: and acquiring a preset target coefficient, and taking the product of the rated voltage and the target coefficient as the voltage threshold.
According to an embodiment of the present application, the first obtaining module is further configured to: and acquiring a first voltage amplitude of the first converter and a second voltage amplitude of the second converter according to the grid-connected point voltage.
According to an embodiment of the present application, the second obtaining module is further configured to: acquiring a first rated voltage of the first converter, and acquiring a first voltage threshold value aiming at the first converter according to the first rated voltage; and acquiring a second rated voltage of the second converter, and acquiring a second voltage threshold value aiming at the second converter according to the second rated voltage.
According to an embodiment of the present application, the second control module is further configured to: acquiring a current voltage per unit value of the wind turbine generator and a rated current of the wind turbine generator; acquiring a first reactive output coefficient according to the rated current of the wind turbine generator; and acquiring the first reactive current output quantity according to the current voltage per unit value, the rated current of the wind turbine generator and the first reactive output coefficient.
According to an embodiment of the present application, the second control module is further configured to: acquiring a current voltage per unit value of the wind turbine generator and a rated current of the second converter; acquiring a second reactive output coefficient according to the rated current of the second converter; and acquiring the second reactive current output quantity according to the current voltage per unit value, the rated current of the second converter and the second reactive output coefficient.
According to an embodiment of the present application, the second control module is further configured to: and the total reactive current output quantity of the converter group is the sum of the first reactive current output quantity and the second reactive current output quantity.
According to an embodiment of the present application, the second control module is further configured to: the method comprises the steps of obtaining a first bridge current of a first current transformer, and determining that the first bridge current is smaller than a preset first blocking pulse current threshold value.
According to an embodiment of the present application, the second control module is further configured to: and controlling the blocking pulse of the first converter in response to the fact that the current of the first bridge circuit is larger than or equal to the current threshold value of the first blocking pulse until the blocking pulse of the first converter reaches a first preset duration.
According to an embodiment of the present application, the second control module is further configured to: and acquiring a second bridge current of the second current transformer, and determining that the second bridge current is smaller than a preset second blocking pulse current threshold.
According to an embodiment of the present application, the second control module is further configured to: and controlling the blocking pulse of the second converter in response to the second bridge circuit current being greater than or equal to the second blocking pulse current threshold value until the blocking pulse of the second converter reaches a second preset duration.
In order to achieve the above object, a third aspect of the present application provides an electronic apparatus, comprising: the control method of the doubly-fed wind turbine generator set comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein when the processor executes the program, the control method of the doubly-fed wind turbine generator set is realized.
In order to achieve the above object, a fourth aspect of the present application proposes a non-transitory computer-readable storage medium storing computer instructions for causing the computer to execute the method for controlling a doubly-fed wind turbine generator set of the first aspect.
In order to achieve the above object, a fifth aspect of the present application proposes a computer program product comprising a computer program which, when executed by a processor, implements the method for controlling a doubly-fed wind turbine according to the first aspect.
The technical scheme provided by the embodiment of the application at least comprises the following beneficial effects:
the application provides a control method of a double-fed wind turbine generator, which can coordinate and control the reactive output capacity of a converter group during voltage drop, shorten the reactive current response time, quickly support the voltage recovery of a power grid, and ensure the safety and reliability of a power system.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present application, nor do they limit the scope of the present application. Other features of the present application will become apparent from the following description.
Drawings
The drawings are included to provide a better understanding of the present solution and are not intended to limit the present application. Wherein:
fig. 1 is a schematic flow chart of a control method for a doubly-fed wind turbine generator provided in an embodiment of the present application;
fig. 2 is a schematic diagram of a wind turbine generator topology provided in an embodiment of the present application;
fig. 3 is a schematic flow chart of another doubly-fed wind turbine generator control method provided in the embodiment of the present application;
fig. 4 is a schematic flow chart of another doubly-fed wind turbine generator control method provided in the embodiment of the present application;
fig. 5 is a schematic flow chart of another doubly-fed wind turbine generator control method provided in the embodiment of the present application;
fig. 6 is a schematic flow chart of a low-penetration dynamic reactive power support control method for a machine-side converter according to an embodiment of the present application;
fig. 7 is a schematic flowchart of a low-penetration dynamic reactive power support control method for a grid-side converter according to an embodiment of the present application;
fig. 8 is a schematic flowchart of a method for controlling a low-penetration dynamic reactive power support by coordinating a machine-side converter and a grid-side converter according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a control device of a doubly-fed wind turbine generator according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The following description of the exemplary embodiments of the present application, taken in conjunction with the accompanying drawings, includes various details of the embodiments of the application for the understanding of the same, which are to be considered exemplary only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present application. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
The following describes the control method of the doubly-fed wind turbine generator in detail by using an embodiment.
Fig. 1 is a schematic flow diagram of a control method of a doubly-fed wind turbine generator provided in an embodiment of the present application.
As shown in fig. 1, the method for controlling a doubly-fed wind turbine generator set provided in this embodiment specifically includes the following steps:
s101, obtaining a grid-connected point voltage of the wind turbine generator, and obtaining a voltage amplitude of a converter group corresponding to the wind turbine generator according to the grid-connected point voltage, wherein the converter group comprises a first converter and a second converter.
It should be noted that when acquiring the grid-connected point voltage of the wind turbine, the grid-connected point voltage of the wind turbine can be directly measured to acquire the grid-connected point voltage,
for example, as shown in fig. 2, voltage measurement is performed on a wind turbine grid-connected point power supply (7) to obtain a grid-connected point voltage.
The converter is an electrical device which changes the voltage, frequency, phase number and other electric quantities or characteristics of a power supply system.
The converter group comprises a first converter and a second converter. Correspondingly, the voltage amplitude of the converter group comprises the voltage amplitude corresponding to the first converter and the voltage amplitude corresponding to the second converter.
In this application, the first converter may be a machine-side converter; the second converter may be a grid-side converter. The grid-side converter refers to a converter connected with a power grid, and the machine-side converter refers to a converter connected with a generator.
S102, rated voltage of the wind turbine generator is obtained, and a voltage threshold corresponding to a low voltage ride through state is obtained according to the rated voltage.
The rated voltage of the wind turbine generator is the voltage of the wind turbine generator in the normal working state.
It should be noted that the voltage of the wind turbine generator in the normal operating state may be read to obtain the rated voltage of the wind turbine generator.
The low-voltage ride-through state refers to a state that when the voltage of a grid-connected point of the wind turbine generator drops, the fan can be kept in grid connection, and even certain reactive power is provided for a power grid.
It should be noted that, in the present application, a specific manner of obtaining the voltage threshold corresponding to the low voltage ride through state according to the rated voltage is not limited, and may be set according to an actual situation.
Optionally, after the rated voltage is obtained, a mapping relationship between the rated voltage and the voltage threshold may be queried to obtain the voltage threshold corresponding to the low-voltage state.
Optionally, after the rated voltage is obtained, the preset proportional relation between the rated voltage and the voltage threshold may be queried to obtain the voltage threshold corresponding to the low-voltage state.
And S103, in response to the voltage amplitude being smaller than the voltage threshold, controlling the converter group to enter a low voltage ride through state.
The voltage threshold may be set according to actual conditions.
In the embodiment of the application, after the voltage amplitude and the voltage threshold of the converter group are obtained, whether the converter group enters the low voltage ride through state or not can be judged based on the magnitude relation between the voltage amplitude and the voltage threshold. Optionally, when the voltage amplitude is smaller than the voltage threshold, controlling the converter group to enter a low voltage ride through state; optionally, when the voltage amplitude is greater than or equal to the voltage threshold, returning to step S101, re-obtaining the grid-connected point voltage of the wind turbine, and obtaining the voltage amplitude of the converter group corresponding to the wind turbine according to the grid-connected point voltage.
And S104, acquiring a first reactive current output quantity of the first converter to control the first converter to perform reactive output according to the first reactive current output quantity, and acquiring a second reactive current output quantity of the second converter to control the second converter to perform reactive output according to the second reactive current output quantity.
In the present application, specific modes of obtaining the first reactive current output quantity of the first converter and obtaining the second reactive current output quantity of the second converter are not limited, and may be set according to actual situations.
Optionally, the obtaining of the first reactive current output quantity and the second reactive current output quantity may be performed by using a reactive current collecting device.
Optionally, the first reactive current output quantity and the second reactive current output quantity may be obtained by using a first reactive current output quantity calculation formula and a second reactive current output quantity calculation formula.
Further, after the first reactive current output quantity is obtained, the first converter can be controlled to perform reactive output according to the first reactive current output quantity, and after the second reactive current output quantity, the reactive output is performed according to the second reactive current output quantity.
The method for controlling the doubly-fed wind turbine generator comprises the steps of obtaining a grid-connected point voltage of the wind turbine generator, obtaining a voltage amplitude value of a converter group corresponding to the wind turbine generator according to the grid-connected point voltage, obtaining a rated voltage of the wind turbine generator, obtaining a voltage threshold value corresponding to a low-voltage ride-through state according to the rated voltage, controlling the converter group to enter the low-voltage ride-through state in response to the fact that the voltage amplitude value is smaller than the voltage threshold value, finally obtaining a first reactive current output quantity of a first converter, controlling the first converter to perform reactive output according to the first reactive current output quantity, obtaining a second reactive current output quantity of a second converter, and controlling the second converter to perform reactive output according to the second reactive current output quantity. Therefore, the reactive output capacity of the converter group can be coordinately controlled during voltage dropping, the reactive current response time is shortened, the voltage recovery of a power grid can be quickly supported, and the safety and the reliability of a power system are guaranteed.
In the embodiment of the application, when trying to obtain the voltage threshold corresponding to the low voltage ride through state, a preset target coefficient may be obtained, and a product of the rated voltage and the target coefficient is used as the voltage threshold, where the threshold corresponding to the low voltage ride through state includes a first voltage threshold of the first converter and a second voltage threshold of the second converter.
Further, in this embodiment of the application, when trying to obtain a voltage amplitude of a converter group corresponding to the wind turbine, the voltage amplitude of the converter group corresponding to the wind turbine may be obtained according to the voltage of the grid-connected point, where the voltage amplitude of the converter group includes a first voltage amplitude of the first converter and a second voltage amplitude of the second converter.
As a possible implementation manner, as shown in fig. 3, based on the above steps, a specific process of obtaining the rated voltage of the wind turbine generator in step S102 and obtaining the voltage threshold corresponding to the low voltage ride through state according to the rated voltage includes the following steps:
s301, a first rated voltage of the first converter is obtained, and a first voltage threshold value aiming at the first converter is obtained according to the first rated voltage.
It should be noted that the first variable flow may be changedThe voltage of the device in normal operation is taken as the first rated voltage. For example, the voltage of the first converter during normal operation is U1Then the voltage U can be adjusted1As the first nominal voltage.
When attempting to obtain the first voltage threshold value for the first current transformer, a preset target coefficient corresponding to the first current transformer may be obtained first, and the product of the first rated voltage and the target coefficient corresponding to the first current transformer may be used as the first voltage threshold value of the first current transformer. That is, a voltage that is a multiple of a target coefficient of the first rated voltage may be used as the first voltage threshold of the first current transformer.
The target coefficient corresponding to the first converter may be set according to actual conditions. For example, it may be set to 0.9; for another example, 0.85 may be set. That is, 0.9 times the first rated voltage may be used as the first voltage threshold of the first converter; a first voltage threshold of the first current transformer can also be defined as 0.85 times the first nominal voltage.
Further, after the first rated voltage and the target coefficient are obtained, a first voltage threshold value for the first converter may be obtained. For example, 0.9 times U may be added1As a first voltage threshold; for another example, 0.85 times U may be added1As the first voltage threshold.
S302, a second rated voltage of the second converter is obtained, and a second voltage threshold value aiming at the second converter is obtained according to the second rated voltage.
When attempting to obtain the second voltage threshold value for the second converter, a preset target coefficient corresponding to the second converter may be obtained first, and the product of the second rated voltage and the target coefficient corresponding to the second converter may be used as the second voltage threshold value of the second converter. That is, the voltage of the target coefficient multiple of the second rated voltage may be used as the second voltage threshold of the second converter.
The target coefficient corresponding to the second converter may be set according to actual conditions. For example, it may be set to 0.9; for another example, 0.85 may be set. That is, 0.9 times the second rated voltage may be used as the second voltage threshold of the second converter; a second voltage threshold of the second current transformer can also be set to 0.85 times the second nominal voltage.
Further, after the second rated voltage and the target coefficient are obtained, a second voltage threshold for the second converter may be obtained. For example, 0.9 times U may be added2As a second voltage threshold; for another example, 0.85 times U may be added2As the second voltage threshold.
It should be noted that, the first voltage amplitude of the first converter and the voltage amplitude of the second converter may be obtained according to the voltage of the grid-connected point, and whether to control the converter group to enter the low voltage ride through state is determined according to a comparison result between the first voltage amplitude and the first voltage threshold and a comparison result between the second voltage amplitude and the second voltage threshold.
In the embodiment of the present application, when the first voltage amplitude is smaller than the first voltage threshold, that is, the voltage amplitude corresponding to the first converter (the machine-side converter) is smaller than the voltage threshold corresponding to the first converter (the machine-side converter), the first converter (the machine-side converter) is controlled to enter a low voltage ride through state; and when the second voltage amplitude is smaller than the second voltage threshold, namely the voltage amplitude corresponding to the second converter (the machine side converter) is smaller than the voltage threshold corresponding to the second converter (the machine side converter), controlling the second converter (the machine side converter) to enter a low-voltage ride-through state.
Further, after the converter group (the first converter and the second converter) enters the low voltage ride through state, the first converter may be controlled to perform reactive output according to the first reactive current output amount, and the second converter may be controlled to perform reactive output according to the second reactive current output amount.
The following explains the processes for obtaining the first reactive current output quantity and the second reactive current output quantity respectively.
As a possible implementation manner for the first reactive current output, as shown in fig. 4, on the basis of the above steps, a specific process of obtaining the first reactive current output of the first converter in the step S104 includes the following steps:
s401, obtaining a current voltage per unit value of the wind turbine generator and rated current of the wind turbine generator.
The voltage per unit value is a dimensionless quantity, and can be generally obtained by dividing the voltage actual value by the voltage reference value. Optionally, the voltage actual value and the voltage reference value of the wind turbine generator may be obtained, and then a quotient of the voltage actual value and the voltage reference value is used as a current voltage per unit value of the wind turbine generator.
It should be noted that, in the present application, in order to ensure the accuracy of the per-unit value of the current voltage, shorten the time for acquiring the per-unit value of the current voltage, and ensure the accuracy of the per-unit value of the current voltage, the per-unit value U of the current voltage of the wind turbine generator may be presetTThe value range of (a). Preferably, the per unit value U of the current voltage of the wind turbine generatorTThe value range of (a) can be set as: u is more than or equal to 0.2TLess than or equal to 0.9. Further, the per unit value U can be obtained according to the current voltage of the wind turbine generatorTThe value range of the voltage per unit value U to the current voltage of the wind turbine generatorTAnd (5) performing identification.
For example, for a wind turbine generator with an actual voltage value of 38.5kV and a reference voltage value of 110kV, the per-unit current voltage value UTAnd may be selected to be 0.35.
It should be noted that the rated current of the wind turbine generator is the current of the wind turbine generator in the normal operating state, and the current of the wind turbine generator in the normal operating state can be measured to obtain the rated current I of the wind turbine generatorn1。
S402, obtaining a first reactive output coefficient according to the rated current of the wind turbine generator.
It should be noted that, because of the limitation of the output capability of the wind turbine, the first reactive output coefficient may be obtained according to the rated current of the wind turbine.
Optionally, the first reactive output coefficient, for example, K, may be obtained by querying a mapping relationship between a rated current of the wind turbine and the first reactive output coefficient1The value was 1.5.
And S403, acquiring a first reactive current output quantity according to the current voltage per unit value, the rated current of the wind turbine generator and the first reactive output coefficient.
It should be noted that, the first reactive current output quantity I can be obtained according to the first reactive current output quantity formulax：
Ix＝K1*(0.9-UT)*In1
Wherein, IxFor the first reactive current output, K1Is the first reactive output coefficient, UTPer unit value of present voltage, In1The rated current of the wind turbine generator is obtained.
Further, before controlling the first converter to perform reactive power output according to the first reactive current output quantity, the magnitude relation between the first bridge circuit current and the first blocking pulse current threshold value needs to be judged.
It should be noted that, a first bridge current of the first converter may be obtained first, and when the first bridge current is smaller than a preset first blocking pulse current threshold, the first converter is controlled not to block a pulse, and the first converter is controlled to perform reactive output according to a first reactive current output quantity; when the current of the first bridge circuit is larger than or equal to the current threshold of the first blocking pulse, the first converter is controlled to block the pulse until the duration of the blocking pulse of the first converter reaches a first preset duration, the first converter restarts the pulse, the control on the generator is recovered, and the first converter is controlled to perform reactive power output according to the first reactive current output quantity.
The first preset time period may be determined according to an actual situation. For example, the first preset duration is set to 1 ms; for another example, the first preset duration is set to 2 ms.
As a possible implementation manner for the second reactive current output quantity, as shown in fig. 5, on the basis of the above steps, a specific process of obtaining the second reactive current output quantity of the second converter in the above step S104 includes the following steps:
s501, obtaining a current voltage per unit value of the wind turbine generator and rated current of the second converter.
It should be noted that the current voltage per unit value U of the wind turbine generatorTThe description is omitted here in correspondence with the foregoing S301.
It should be noted that the rated current of the second converter is the current of the second converter in the normal operating state, and the current of the second converter in the normal operating state can be measured to obtain the rated current I of the second convertern2。
And S502, acquiring a second reactive output coefficient according to the rated current of the second converter.
It should be noted that, because the reactive support of the second converter is used for assisting in shortening the dynamic reactive current response time of the wind turbine generator, it is avoided that the dynamic reactive current response time caused by the limitation of the reactive current output capability at the moment of low penetration due to the overlarge transient current of the first converter exceeds the standard requirement, and therefore, the second reactive output coefficient K is2Limited by the rated current of the second converter, so that a second reactive output coefficient, preferably K, can be obtained according to the rated current of the second converter2The value was taken to be 0.6.
And S503, obtaining a second reactive current output quantity according to the current voltage per unit value, the rated current of the second converter and the second reactive output coefficient.
It should be noted that the second reactive current output quantity I can be obtained according to the second reactive current output quantity formulay：
Iy＝K2*(0.9-UT)*In2
Wherein, IyFor a second reactive current output, K2Is the second reactive output coefficient, UTPer unit value of present voltage, In2The rated current of the second converter.
Further, before controlling the second converter to perform reactive power output according to the second reactive current output quantity, the magnitude relation between the second bridge circuit current and the second blocking pulse current threshold value needs to be judged.
It should be noted that, a second bridge circuit current of the second converter may be obtained first, and when the second bridge circuit current is smaller than a preset second blocking pulse current threshold, the second converter is controlled not to block a pulse, and the second converter is controlled to perform reactive output according to a second reactive current output quantity; and when the current of the second bridge circuit is greater than or equal to the current threshold of the second blocking pulse, controlling the second converter to block the pulse until the duration of the blocking pulse of the second converter reaches a second preset duration, restarting the pulse of the second converter, recovering the control of the generator, and controlling the second converter to perform reactive power output according to the second reactive current output quantity.
The second preset time period may be determined according to an actual situation. For example, the second preset duration is set to 1 ms; for another example, the second preset time period is set to 2 ms.
Further, after the first reactive current output quantity and the second reactive current output quantity are obtained, the sum of the first reactive current output quantity and the second reactive current output quantity may be used as the total reactive current output quantity of the converter group.
Therefore, according to the control method of the doubly-fed wind turbine generator, whether the converter set enters a low-voltage ride-through state or not is judged by obtaining the rated voltage and the voltage threshold of the wind turbine generator and based on the magnitude relation between the voltage amplitude and the voltage threshold, and finally the sum of the first reactive current output quantity and the second reactive current output quantity is used as the total reactive current output quantity of the converter set. Therefore, the voltage recovery of the system supported by the first converter and the second converter together is realized, the dynamic response time of the reactive current is shortened, and the stability of the power system is enhanced.
In summary, according to the control method of the doubly-fed wind turbine generator set provided by the application, the first converter and the second converter can be controlled simultaneously, so that the low-penetration dynamic reactive power support control method under the coordination control of the machine side converter and the grid side converter is realized.
For the machine side converter, as shown in fig. 6, optionally, the voltage of the grid-connected point of the wind turbine generator may be obtained, and the voltage of the grid-connected point of the wind turbine generator is output to the machine side converter of the doubly-fed wind turbine generator, and the voltage amplitude is obtained through calculation. Further, the voltage amplitude can be compared with 90% of rated voltage, and whether the machine side converter needs to enter a low voltage ride through state or not is judged; if the current value is less than the preset threshold value, the converter enters a low voltage ride through state, the bridge circuit current of the converter at the machine side is compared with the preset current blocking pulse threshold value, whether the converter at the machine side needs to block the pulse is judged, if the current value is less than the preset threshold value, the pulse is not blocked, and the converter at the machine side starts low-pass reactive current to output; if the voltage is larger than the preset value, the machine side converter firstly blocks the pulse, after a short time, the machine side converter restarts the pulse to restore the control of the generator, and the machine side restarts the low-penetration reactive current output capacity.
The reactive current output of the machine side converter is as follows:
I≥K*(0.9-UT)*In,(0.2≤UT≤0.9)
wherein, UTIs the per unit value, I, of the current voltagenThe rated current of the wind turbine generator is used, K is a machine side reactive output coefficient, and preferably, the K value is 1.5.
For the grid-side converter, as shown in fig. 7, optionally, the grid-connected point voltage of the wind turbine generator may be obtained, and the grid-connected point voltage of the wind turbine generator is output to the grid-side converter of the doubly-fed wind turbine generator, and the voltage amplitude is obtained through calculation. Further, the voltage amplitude value can be compared with 90% of rated voltage, and whether the grid-side converter needs to enter a low-voltage ride-through state or not is judged; if the current value is less than the preset threshold value, the grid-side converter enters a low-voltage ride through state, the bridge circuit current of the grid-side converter is compared with the preset current blocking pulse threshold value, whether the grid-side converter needs to block the pulse or not is judged, if the current value is less than the preset threshold value, the pulse is not blocked, and the grid-side converter starts low-voltage ride through reactive current to output; if the voltage is larger than the preset value, the grid-side converter firstly blocks the pulse, after a short time, the grid-side converter restarts the pulse to restore the control of the generator, and the grid-side restarts the low-penetration reactive current output capacity.
The reactive current output of the grid-side converter is as follows:
I1≥K1*(0.9-UT)*In1,(0.2≤UT≤0.9)
wherein, UTIs the per unit value, I, of the current voltagen1Rated current, K, for grid-side converter1For the net-side reactive output coefficient, preferably, K1The value was 0.6.
For the low-penetration dynamic reactive support control method based on the coordinated control of the machine side converter and the grid side converter, as shown in fig. 8, optionally, the grid-connected point voltage of the wind turbine generator may be obtained, the reactive current output quantity of the machine side converter and the reactive current output quantity of the grid side converter may be obtained, and then the algebraic sum of the reactive current output quantity of the machine side converter and the reactive current output quantity of the grid side converter is used as the total reactive current output quantity of the wind turbine generator.
In order to implement the foregoing embodiment, this embodiment provides a control device for a doubly-fed wind turbine generator, and fig. 9 is a schematic structural diagram of the control device for a doubly-fed wind turbine generator provided in this embodiment of the present application.
As shown in fig. 9, the control apparatus 1000 for a doubly-fed wind turbine includes: a first acquisition module 110, a second acquisition module 120, a first control module 130, and a second control module 140.
The first obtaining module 110 is configured to obtain a grid-connected point voltage of a wind turbine generator, and obtain a voltage amplitude of a converter group corresponding to the wind turbine generator according to the grid-connected point voltage, where the converter group includes a first converter and a second converter;
the second obtaining module 120 is configured to obtain a rated voltage of the wind turbine generator, and obtain a voltage threshold corresponding to a low-voltage ride-through state according to the rated voltage;
a first control module 130, configured to control the converter group to enter the low voltage ride through state in response to the voltage magnitude being less than the voltage threshold;
the second control module 140 is configured to obtain a first reactive current output amount of the first converter, so as to control the first converter to perform reactive power output according to the first reactive current output amount, and obtain a second reactive current output amount of the second converter, so as to control the second converter to perform reactive power output according to the second reactive current output amount.
According to an embodiment of the present application, the second obtaining module 120 is further configured to: and acquiring a preset target coefficient, and taking the product of the rated voltage and the target coefficient as the voltage threshold.
According to an embodiment of the present application, the first obtaining module 110 is further configured to: and acquiring a first voltage amplitude of the first converter and a second voltage amplitude of the second converter according to the grid-connected point voltage.
According to an embodiment of the present application, the second obtaining module 120 is further configured to: acquiring a first rated voltage of the first converter, and acquiring a first voltage threshold value aiming at the first converter according to the first rated voltage; and acquiring a second rated voltage of the second converter, and acquiring a second voltage threshold value aiming at the second converter according to the second rated voltage.
According to an embodiment of the present application, the second control module 140 is further configured to: acquiring a current voltage per unit value of the wind turbine generator and a rated current of the wind turbine generator; acquiring a first reactive output coefficient according to the rated current of the wind turbine generator; and acquiring the first reactive current output quantity according to the current voltage per unit value, the rated current of the wind turbine generator and the first reactive output coefficient.
According to an embodiment of the present application, the second control module 140 is further configured to: acquiring a current voltage per unit value of the wind turbine generator and a rated current of the second converter; acquiring a second reactive output coefficient according to the rated current of the second converter; and acquiring the second reactive current output quantity according to the current voltage per unit value, the rated current of the second converter and the second reactive output coefficient.
According to an embodiment of the present application, the control device 1000 further includes: and the total reactive current output quantity of the converter group is the sum of the first reactive current output quantity and the second reactive current output quantity.
According to an embodiment of the present application, the second control module 140 is further configured to: the method comprises the steps of obtaining a first bridge current of a first current transformer, and determining that the first bridge current is smaller than a preset first blocking pulse current threshold value.
According to an embodiment of the present application, the second control module 140 is further configured to: and controlling the blocking pulse of the first converter in response to the fact that the current of the first bridge circuit is larger than or equal to the current threshold value of the first blocking pulse until the blocking pulse of the first converter reaches a first preset duration.
According to an embodiment of the present application, the second control module 140 is further configured to: and acquiring a second bridge current of the second current transformer, and determining that the second bridge current is smaller than a preset second blocking pulse current threshold.
According to an embodiment of the present application, the second control module 140 is further configured to: and controlling the blocking pulse of the second converter in response to the second bridge circuit current being greater than or equal to the second blocking pulse current threshold value until the blocking pulse of the second converter reaches a second preset duration.
The control device of the doubly-fed wind turbine generator set, provided by the application, obtains the voltage amplitude of a converter group corresponding to the wind turbine generator set by obtaining the grid-connected point voltage of the wind turbine generator set and according to the grid-connected point voltage, then obtains the rated voltage of the wind turbine generator set, obtains the voltage threshold corresponding to the low-voltage ride-through state according to the rated voltage, responds to the situation that the voltage amplitude is smaller than the voltage threshold, controls the converter group to enter the low-voltage ride-through state, finally obtains the first reactive current output quantity of the first converter, controls the first converter to perform reactive output according to the first reactive current output quantity, and obtains the second reactive current output quantity of the second converter, and controls the second converter to perform reactive output according to the second reactive current output quantity. Therefore, the reactive output capacity of the converter group can be coordinately controlled during voltage dropping, the reactive current response time is shortened, the voltage recovery of a power grid can be quickly supported, and the safety and the reliability of a power system are guaranteed.
In order to implement the above embodiments, the present application also proposes an electronic device 2000, as shown in fig. 10, including: the control method comprises a memory 210, a processor 220 and a computer program stored on the memory 210 and executable on the processor 220, wherein the processor executes the program to implement the control method of the doubly-fed wind turbine generator according to the first aspect.
In order to achieve the above embodiments, the present application proposes a non-transitory computer readable storage medium storing computer instructions, wherein the computer instructions are configured to cause the computer to execute the method for controlling a doubly-fed wind turbine generator set according to the first aspect.
In order to implement the foregoing embodiments, the present application further provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the computer program implements the control method for a doubly-fed wind turbine generator set according to the first aspect.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present application may be executed in parallel, sequentially, or in different orders, and the present invention is not limited thereto as long as the desired results of the technical solutions disclosed in the present application can be achieved.
The above-described embodiments should not be construed as limiting the scope of the present application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (25)

1. A control method of a doubly-fed wind turbine generator comprises the following steps:
acquiring a grid-connected point voltage of a wind turbine generator, and acquiring a voltage amplitude of a converter group corresponding to the wind turbine generator according to the grid-connected point voltage, wherein the converter group comprises a first converter and a second converter;
acquiring rated voltage of the wind turbine generator, and acquiring a voltage threshold corresponding to a low voltage ride through state according to the rated voltage;
in response to the voltage magnitude being less than the voltage threshold, controlling the set of converters to enter the low voltage ride through state;
and acquiring a first reactive current output quantity of the first converter to control the first converter to perform reactive output according to the first reactive current output quantity, and acquiring a second reactive current output quantity of the second converter to control the second converter to perform reactive output according to the second reactive current output quantity.
2. The control method according to claim 1, wherein the obtaining of the voltage threshold corresponding to the low voltage ride through state according to the rated voltage comprises:
and acquiring a preset target coefficient, and taking the product of the rated voltage and the target coefficient as the voltage threshold.
3. The control method according to claim 1 or 2, wherein the obtaining of the voltage amplitude of the converter group corresponding to the wind turbine generator according to the grid-connected point voltage includes:
and acquiring a first voltage amplitude of the first converter and a second voltage amplitude of the second converter according to the grid-connected point voltage.
4. The control method according to claim 3, wherein the obtaining of the rated voltage of the wind turbine generator and the obtaining of the voltage threshold corresponding to the low voltage ride through state according to the rated voltage comprises:
acquiring a first rated voltage of the first converter, and acquiring a first voltage threshold value aiming at the first converter according to the first rated voltage;
and acquiring a second rated voltage of the second converter, and acquiring a second voltage threshold value aiming at the second converter according to the second rated voltage.
5. The control method of claim 1, wherein said obtaining a first reactive current output quantity of said first converter comprises:
acquiring a current voltage per unit value of the wind turbine generator and a rated current of the wind turbine generator;
acquiring a first reactive output coefficient according to the rated current of the wind turbine generator;
and acquiring the first reactive current output quantity according to the current voltage per unit value, the rated current of the wind turbine generator and the first reactive output coefficient.
6. The control method of claim 1, wherein said obtaining a second reactive current output quantity of said second converter comprises:
acquiring a current voltage per unit value of the wind turbine generator and a rated current of the second converter;
acquiring a second reactive output coefficient according to the rated current of the second converter;
and acquiring the second reactive current output quantity according to the current voltage per unit value, the rated current of the second converter and the second reactive output coefficient.
7. The control method according to claim 1, further comprising:
and the total reactive current output quantity of the converter group is the sum of the first reactive current output quantity and the second reactive current output quantity.
8. The control method according to claim 1 or 5, wherein before controlling the first converter to perform reactive power output according to the first reactive current output quantity, the method further comprises:
the method comprises the steps of obtaining a first bridge current of a first current transformer, and determining that the first bridge current is smaller than a preset first blocking pulse current threshold value.
9. The control method according to claim 8, further comprising:
and controlling the blocking pulse of the first converter in response to the fact that the current of the first bridge circuit is larger than or equal to the current threshold value of the first blocking pulse until the blocking pulse of the first converter reaches a first preset duration.
10. The control method according to claim 1 or 6, wherein before controlling the second converter to perform reactive power output according to the second reactive current output quantity, the method further comprises:
and acquiring a second bridge current of the second current transformer, and determining that the second bridge current is smaller than a preset second blocking pulse current threshold.
11. The control method according to claim 10, further comprising:
and controlling the blocking pulse of the second converter in response to the second bridge circuit current being greater than or equal to the second blocking pulse current threshold value until the blocking pulse of the second converter reaches a second preset duration.
12. A control device of a doubly-fed wind turbine generator set comprises:
the wind turbine generator system comprises a first acquisition module, a second acquisition module and a control module, wherein the first acquisition module is used for acquiring a grid-connected point voltage of a wind turbine generator and acquiring a voltage amplitude of a converter group corresponding to the wind turbine generator according to the grid-connected point voltage, and the converter group comprises a first converter and a second converter;
the second acquisition module is used for acquiring the rated voltage of the wind turbine generator and acquiring a voltage threshold corresponding to a low-voltage ride-through state according to the rated voltage;
the first control module is used for responding to the condition that the voltage amplitude is smaller than the voltage threshold value, and controlling the converter group to enter the low-voltage ride-through state;
the second control module is used for obtaining a first reactive current output quantity of the first converter to control the first converter to perform reactive power output according to the first reactive current output quantity, and obtaining a second reactive current output quantity of the second converter to control the second converter to perform reactive power output according to the second reactive current output quantity.
13. The control device of claim 12, wherein the second obtaining module is further configured to:
and acquiring a preset target coefficient, and taking the product of the rated voltage and the target coefficient as the voltage threshold.
14. The control device of claim 12 or 13, wherein the first obtaining module is further configured to:
and acquiring a first voltage amplitude of the first converter and a second voltage amplitude of the second converter according to the grid-connected point voltage.
15. The control device of claim 14, wherein the second obtaining module is further configured to:
acquiring a first rated voltage of the first converter, and acquiring a first voltage threshold value aiming at the first converter according to the first rated voltage;
and acquiring a second rated voltage of the second converter, and acquiring a second voltage threshold value aiming at the second converter according to the second rated voltage.
16. The control apparatus of claim 12, wherein the second control module is further configured to:
acquiring a current voltage per unit value of the wind turbine generator and a rated current of the wind turbine generator;
acquiring a first reactive output coefficient according to the rated current of the wind turbine generator;
and acquiring the first reactive current output quantity according to the current voltage per unit value, the rated current of the wind turbine generator and the first reactive output coefficient.
17. The control apparatus of claim 12, wherein the second control module is further configured to:
acquiring a current voltage per unit value of the wind turbine generator and a rated current of the second converter;
acquiring a second reactive output coefficient according to the rated current of the second converter;
and acquiring the second reactive current output quantity according to the current voltage per unit value, the rated current of the second converter and the second reactive output coefficient.
18. The control device according to claim 12, further comprising:
and the total reactive current output quantity of the converter group is the sum of the first reactive current output quantity and the second reactive current output quantity.
19. The control device of claim 12 or 16, wherein the second control module is further configured to:
the method comprises the steps of obtaining a first bridge current of a first current transformer, and determining that the first bridge current is smaller than a preset first blocking pulse current threshold value.
20. The control device of claim 19, wherein the second control module is further configured to:
and controlling the blocking pulse of the first converter in response to the fact that the current of the first bridge circuit is larger than or equal to the current threshold value of the first blocking pulse until the blocking pulse of the first converter reaches a first preset duration.
21. The control device of claim 12 or 17, wherein the second control module is further configured to:
and acquiring a second bridge current of the second current transformer, and determining that the second bridge current is smaller than a preset second blocking pulse current threshold.
22. The control device of claim 21, wherein the second control module is further configured to:
and controlling the blocking pulse of the second converter in response to the second bridge circuit current being greater than or equal to the second blocking pulse current threshold value until the blocking pulse of the second converter reaches a second preset duration.
23. An electronic device, comprising: memory, processor and computer program stored on the memory and executable on the processor, the processor implementing the method for controlling a doubly-fed wind turbine as claimed in any of claims 1 to 11 when executing the program.
24. A non-transitory computer readable storage medium storing computer instructions for causing the computer to perform the method of controlling a doubly fed wind turbine generator as claimed in any of claims 1 to 11.
25. A computer program product comprising a computer program which, when executed by a processor, implements a method of controlling a doubly-fed wind turbine according to any of claims 1 to 11.
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