WO2023231252A1

WO2023231252A1 - Control method for wind turbine generator system and wind turbine generator system

Info

Publication number: WO2023231252A1
Application number: PCT/CN2022/122231
Authority: WO
Inventors: 曹晓东; 刘世军; 俞黎萍
Original assignee: 金风科技股份有限公司
Priority date: 2022-05-31
Filing date: 2022-09-28
Publication date: 2023-12-07
Also published as: CN117200313A

Abstract

Provided in the present disclosure are a control method for a wind turbine generator system and a wind turbine generator system. The control method comprises: determining an active current reference value of an energy storage apparatus; determining a reactive current reference value of the energy storage apparatus; determining a quadrature-axis voltage reference value of and a direct-axis voltage reference value of the energy storage apparatus; and, on the basis of the quadrature-axis voltage reference value and the direct-axis voltage reference value, controlling the energy storage apparatus to be charged or discharged, so as to control a direct-current bus voltage. In the control method for a wind turbine generator system and the wind turbine generator system of the present disclosure, the problem that the controllability of a generator system cannot be improved is solved.

Description

Control method of wind turbine and wind turbine

Technical field

The present disclosure relates to the technical field of wind power generation, and more specifically, to a control method for a wind power generator and a wind power generator.

Background technique

With the development of wind power technology, the structure of wind turbines and the corresponding control processes are becoming more and more complex. In addition to the basic control mode, it is also necessary to implement related control functions such as active support.

In the existing control scheme, under normal operation of the unit, the control of the DC bus can be achieved through the fan converter of the unit. However, due to the control binding of the wind turbine converter to the DC bus, it is unable to implement other control processes, such as decoupling control of machine-side power and grid-side power, making it impossible to improve the controllability of the unit.

Contents of the invention

In view of the problem that the controllability of the unit cannot be improved in the existing control scheme, the present disclosure provides a control method for a wind turbine generator set and a wind turbine generator unit.

A first aspect of the present disclosure provides a control method for a wind turbine generator set, which includes a wind turbine converter and an energy storage device. The energy storage device is connected to a DC bus of the wind turbine converter, and the The control method includes: determining the active current reference value of the energy storage device based on the preset DC bus voltage reference value and the obtained DC bus voltage; based on the preset energy storage device voltage reference value and the obtained energy storage device voltage, determine the reactive current reference value of the energy storage device; based on the active current reference value and reactive current reference value of the energy storage device and the acquired active current and reactive current of the energy storage device, determine The quadrature axis voltage reference value and the direct axis voltage reference value of the energy storage device; based on the quadrature axis voltage reference value and the direct axis voltage reference value, control the charge or discharge of the energy storage device to control the DC bus voltage.

A second aspect of the present disclosure provides a computer device. The computer device includes a processor and a memory: the memory is used to store program code and transmit the program code to the processor; the processor is used according to The instructions in the program code execute the control method of the wind turbine generator according to the present disclosure.

A third aspect of the present disclosure provides a wind power generator, which includes a control device for a wind power generator according to the present disclosure, or a computer device according to the present disclosure.

According to the wind turbine control method and the wind turbine set of the present disclosure, the energy storage device can be connected to the DC bus of the wind turbine converter to allow the DC bus voltage to be controlled by controlling the charging or discharging of the energy storage device. In this way, the DC bus voltage can be controlled. The control of the fan converter and the DC bus are unbound, so that the fan converter can be used to implement other control processes and improve the controllability of the unit.

Description of the drawings

FIG. 1 is a schematic block diagram showing an example of a wind turbine converter of a conventional wind turbine generator.

FIG. 2 is a schematic block diagram illustrating a wind turbine converter and an energy storage device of a wind turbine generator according to an exemplary embodiment of the present disclosure.

3 is a schematic block diagram illustrating a wind turbine converter and a flywheel energy storage unit according to an exemplary embodiment of the present disclosure.

4 is a schematic diagram illustrating the overall architecture of a flywheel energy storage system including a flywheel energy storage unit according to an exemplary embodiment of the present disclosure.

FIG. 5 is a schematic flowchart illustrating a control method of a wind turbine generator according to an exemplary embodiment of the present disclosure.

6 is a schematic diagram illustrating control of a flywheel energy storage converter of a wind turbine generator according to an exemplary embodiment of the present disclosure.

FIG. 7 is a schematic flowchart illustrating a first example of control of a grid-side converter in a method for controlling a wind turbine generator according to an exemplary embodiment of the present disclosure.

8 is a schematic diagram illustrating a first example of control of a grid-side converter of a wind turbine generator according to an exemplary embodiment of the present disclosure.

FIG. 9 is a schematic flowchart illustrating a second example of control of a grid-side converter in the control method of a wind turbine generator according to an exemplary embodiment of the present disclosure.

FIG. 10 is a schematic diagram illustrating a second example of control of a grid-side converter of a wind turbine generator according to an exemplary embodiment of the present disclosure.

FIG. 11 is a schematic flowchart illustrating control of a machine-side converter of a wind turbine generator according to an exemplary embodiment of the present disclosure.

FIG. 12 is a schematic diagram illustrating control of a machine-side converter of a wind turbine generator according to an exemplary embodiment of the present disclosure.

FIG. 13 is a schematic diagram illustrating an example of a wind turbine generator according to an exemplary embodiment of the present disclosure.

Reference signs:

1000: Flywheel energy storage system, 1001: System controller, 1002: Auxiliary equipment, 100: Generator unit, 200: Wind turbine converter, 210: Machine side converter, 211: First filter, 212: First Bridge circuit module, 220: grid-side converter, 221: second filter, 222: second bridge circuit module, 230: braking unit, 240: discharge unit, 300: energy storage device, 310: flywheel storage Energy unit, 320: flywheel motor converter, 321: flywheel filter, 322: flywheel bridge circuit module, 330: flywheel energy storage converter, 400: AC power grid, 410: first power grid, 420: second power grid .

Detailed ways

The following detailed description is provided to assist the reader in gaining a comprehensive understanding of the methods, devices, and/or systems described herein. However, various alterations, modifications, and equivalents of the methods, apparatus, and/or systems described herein will be apparent upon understanding this disclosure. For example, the sequences of operations described herein are examples only and are not limited to those sequences set forth herein, but other than that operations must occur in a specific order, as will be apparent upon understanding the disclosure of the present application. Be changed that way. Furthermore, descriptions of features known in the art may be omitted for greater clarity and conciseness.

Features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein have been provided to illustrate only some of the many possible ways of implementing the methods, apparatus, and/or systems described herein that will be apparent upon understanding the disclosure of this application. clearly.

As used herein, the term "and/or" includes any one and any combination of two or more of the associated listed items.

Although terms such as "first", "second" and "third" may be used herein to describe various members, components, regions, layers or sections, these members, components, regions, layers or sections should not be referred to as restricted by these terms. Rather, these terms are only used to distinguish one member, component, region, layer or section from another member, component, region, layer or section. Thus, what is referred to as a first member, first component, first region, first layer or first section in the examples described herein could also be termed a second member, second component, first region, first layer or first section without departing from the teachings of the examples. component, second area, second layer or second part.

In the specification, when an element (such as a layer, region, or substrate) is described as being "on," "connected to" or "coupled to" another element, that element can be directly "on" the other element on, directly "connected to" or "coupled to" another element, or there may be one or more other intervening elements present. In contrast, when an element is described as being "directly on," "directly connected to" or "directly coupled to" another element, there may be no intervening elements present.

The terms used herein are used only to describe various examples and are not intended to limit the disclosure. The singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "includes," and "having" indicate the presence of recited features, quantities, operations, components, elements and/or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components , components and/or combinations thereof.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs after understanding this disclosure. Unless expressly so defined herein, terms (such as terms defined in general dictionaries) should be construed to have meanings consistent with their meaning in the context of the relevant art and in this disclosure, and should not be idealized or Explanation is too formal.

Furthermore, in the description of examples, when it is considered that a detailed description of a well-known related structure or function will cause an obscure interpretation of the present disclosure, such detailed description will be omitted.

FIG. 1 shows a schematic block diagram of an example of a wind turbine converter of an existing wind turbine generator.

As shown in FIG. 1 , a wind turbine generator unit includes a generator unit 100 and a wind turbine converter 200 .

The generator unit 100 may include a fan impeller and a generator G, and an AC port of the generator G is connected to an AC port of the fan converter 200 to be able to provide power to the fan converter 200 .

The wind turbine converter 200 may include a machine-side converter 210 and a grid-side converter 220 . As an example, the AC side of the machine-side converter 210 may be connected to the AC port of the generator G, and the DC side of the machine-side converter 210 may be connected to the DC side of the grid-side converter 220 . The grid-side converter 220 The AC side can be connected to the AC grid 400.

The wind turbine converter 200 may also include a braking unit 230 and a discharge unit 240. The braking unit 230 can consume excess power when the unit is in a high voltage/low voltage fault ride-through to avoid damage to electrical components. The discharge unit 240 can be used in wind power When the generator set is shut down, the electric energy of the DC bus support capacitor is released.

For such a wind turbine generator set, under normal operation of the generator set, the DC bus can be controlled through the fan converter 200 of the generator set. However, since the fan converter 200 is bound to the control of the DC bus, it cannot implement other control processes, thereby failing to improve the controllability of the unit.

Specifically, the machine-side power and the grid-side power cannot be decoupled. Because under normal operation of the unit, the machine-side active power and the grid-side active power are balanced. Therefore, the unit cannot achieve the maximum wind power tracking without changing the unit. The grid-connected power is highly controllable.

In addition, under the current control mode, the maximum wind power tracking on the machine side and the balance control of machine-side power and grid-side power cause grid-connected sub-synchronous harmonics. In addition, due to the stability of the DC bus voltage controlled by the grid side, the grid-connected current harmonics are large, affecting the grid-connected power quality.

In addition, in the current control mode, under high voltage/low voltage fault ride-through conditions, the braking unit (braking unit 230 shown in Figure 1) is usually activated to assist in DC bus voltage control. In this way, on the one hand, it will It affects the stability of active power and reactive power control on the grid side, causing problems in the applicability of the high voltage/low voltage ride-through function. On the other hand, it will cause a waste of electric energy.

In addition, based on the current control mode, the implementation of active power support functions such as unit inertia response and primary frequency modulation is complicated, and it is impossible to get rid of the constraints of machine-side power and grid-side power balance.

In addition, the grid-side power is completely determined by the wind energy on the machine side. Therefore, when the wind speed changes, the grid-connected power cannot be output smoothly.

In addition, based on the current control mode, free switching of off-grid/grid-connected control cannot be achieved.

In addition, under weak grid conditions (SCR<2), the current control mode is poorly adapted, resulting in greater grid connection pressure.

In addition, based on the current control mode, the free switching of grid-side voltage source control and current source control modes is more challenging under weak grid adaptability.

In view of this, exemplary embodiments of the present disclosure provide a control method for a wind turbine, a control device for a wind turbine, a computer device, and a wind turbine to solve at least one of the above problems.

According to a first aspect of the present disclosure, a control method for a wind turbine generator set is provided.

An exemplary structure of a wind turbine converter and an energy storage device according to an exemplary embodiment of the present disclosure will first be described below with reference to FIG. 2 .

As shown in FIG. 2 , the wind turbine may include a generator unit 100 , a wind turbine converter 200 and an energy storage device 300 .

The generator unit 100 may include a fan impeller and a generator, and an AC port of the generator is connected to an AC port of the fan converter 200 to be able to provide power to the fan converter 200 .

The wind turbine converter 200 may include a machine-side converter 210 and a grid-side converter 220 . As an example, the AC side of the machine-side converter 210 may be connected to the AC port of the generator, the DC side of the machine-side converter 210 may be connected to the DC side of the grid-side converter 220 , and the DC side of the grid-side converter 220 The AC side can be connected to the AC grid 400 .

In an exemplary embodiment according to the present disclosure, the machine-side converter 210 and the grid-side converter 220 may be bidirectional AC-DC converters. The machine-side converter 210 and the grid-side converter 220 may have the same structure. During the current conversion process, the machine-side converter 210 and the grid-side converter 220 play opposite current conversion functions, for example, as shown in Figure As shown in 2, the machine-side converter 210 can convert the AC power from the generator into DC power, and the grid-side converter 220 can convert the DC power into AC power and provide it to the AC grid.

In addition, as shown in FIG. 2 , the wind turbine converter 200 may also include a braking unit 230 and a discharging unit 240 connected between the machine-side converter 210 and the grid-side converter 220 . However, it is not limited thereto. According to The wind turbine converter 200 of the exemplary embodiment of the present disclosure may also not include the braking unit 230 and the discharging unit 240, but only adjust the DC bus voltage through the energy storage device 300, which will be described in detail below.

The energy storage device 300 may be connected to the DC side of the wind turbine converter 200 . As shown in FIG. 2 , the energy storage device 300 can be connected to the DC bus of the wind turbine converter 200 , specifically, between the machine-side converter 210 and the grid-side converter 220 .

The energy storage device 300 may be an energy storage device or system with charging and discharging functions. Such an energy storage device or system may include, for example, devices such as rechargeable batteries, supercapacitors, etc., but it is not limited thereto. For example, it may also This could be a flywheel energy storage unit, which will be described in detail in the examples of Figures 3 and 4.

By connecting the energy storage device 300 to the DC bus of the wind turbine converter 200, the DC bus voltage can be controlled by controlling the charging or discharging of the energy storage device. The specific control process will be described in detail below with reference to FIG. 5 .

As an example, the energy storage device 300 may be a flywheel energy storage unit. The structures of the wind turbine converter and the flywheel energy storage unit will be described in detail below with reference to FIGS. 3 and 4 .

FIG. 3 shows an example in which the energy storage device is a flywheel energy storage unit according to an exemplary embodiment of the present disclosure.

As shown in FIG. 3 , the machine-side converter 210 may include a first filter 211 and a first bridge circuit module 212 , and the grid-side converter 220 may include a second filter 221 and a second bridge circuit module 222 .

The first filter 211 and the second filter 221 may have the same or similar structures, for example, both may be inductors, but their specific parameters may be the same or different.

The first bridge circuit module 212 and the second bridge circuit module 222 may have the same or similar structure, and may be a three-phase bridge circuit, such as a two-level three-phase bridge circuit and a five-level three-phase bridge circuit. circuit, but it should be understood that three-phase bridge circuits with other topological structures can also be used, such as three-level three-phase bridge circuits. The present disclosure does not place special restrictions on the specific structure of the bridge circuit.

The wind turbine converter 200 may also include a first capacitor C1. The first capacitor C1 may be used as a DC bus support voltage. The first capacitor C1 may be connected to the DC positive bus of the machine-side converter 210 and the grid-side converter 220. and the DC negative bus, here, the first capacitor C1 can be replaced by two or more capacitors.

The flywheel energy storage unit 310 in Figure 3 may be connected to the wind turbine converter 200 of the wind turbine. Specifically, the flywheel energy storage unit 310 may be connected to the DC bus of the wind turbine converter 200 .

As shown in FIG. 3 , the flywheel energy storage unit 310 may be connected between the machine-side converter 210 and the grid-side converter 220 of the wind turbine converter 200 .

In addition, a flywheel motor converter 320 may also be connected between the flywheel energy storage unit 310 and the DC bus of the wind turbine converter 200 . The AC side of the flywheel energy storage unit 310 is connected to the AC side of the flywheel motor converter 320 , and the DC side of the flywheel motor converter 320 is connected to the DC bus of the wind turbine converter 200 .

The flywheel motor converter 320 can control the speed of the flywheel motor in the flywheel energy storage unit 310. When the speed of the flywheel motor increases, the flywheel energy storage unit 310 is charged, that is, the electrical energy is converted into flywheel rotational kinetic energy; When the rotational speed decreases, the flywheel energy storage unit 310 is discharged, that is, the flywheel rotational kinetic energy is converted into electrical energy.

As shown in FIG. 3 , the flywheel motor converter 320 may include a flywheel filter 321 and a flywheel bridge circuit module 322 . The flywheel filter 321 may have the same or similar structure as the first filter 211 and the second filter 221 described above, for example, it may also be an inductor, but the specific parameters of the three may be the same or different.

The flywheel bridge circuit module 322 may have the same or similar structure as the first bridge circuit module 212 and the second bridge circuit module 222 described above, and may also be a three-phase bridge circuit, such as a two-level three-phase bridge circuit. phase bridge circuit and a five-level three-phase bridge circuit, but it should be understood that three-phase bridge circuits with other topologies can also be used, such as a three-level three-phase bridge circuit. The present disclosure describes the bridge circuit The specific structure is not particularly limited.

In addition, a second capacitor C2 may be connected between the DC positive bus and the DC negative bus of the flywheel motor converter 320, and the second capacitor C2 may serve as a DC bus support voltage. Here, the second capacitor C2 may be composed of two or more Multiple capacitor replacement.

Flywheel energy storage system is an energy storage device that realizes two-way conversion of electrical energy and kinetic energy.

In the example of FIG. 4 , the flywheel energy storage system 1000 may include a system controller 1001 , a flywheel energy storage unit 310 , a flywheel motor converter 320 , a flywheel energy storage converter 330 and an auxiliary device 1002 . Here, the flywheel energy storage unit 310 (flywheel energy storage unit) can be an electromechanical structural component of the flywheel energy storage system composed of a flywheel rotor, a flywheel motor, a bearing, a sealed housing, etc. The flywheel motor converter 320 (flywheel converter) can be a power electronic power device that controls the speed and power of the flywheel motor and directly or indirectly realizes the bidirectional transmission of (power supply or load) DC power and flywheel motor energy. The flywheel energy storage converter 330 (power converter) can be an electronic power device that realizes bidirectional energy transfer between the DC bus of the flywheel energy storage system and the AC grid (and/or load).

As shown in Figure 5, the control method of the wind turbine may include the following steps.

In step S51, the active current reference value of the energy storage device may be determined based on the preset DC bus voltage reference value and the acquired DC bus voltage.

Here, the DC bus voltage reference value can be set arbitrarily according to actual needs, which can be used as the control target value for the DC bus. The DC bus voltage can be obtained through real-time acquisition.

In this step, the error between the preset DC bus voltage reference value and the currently collected DC bus voltage can be determined, and the error can be input into the controller, thereby determining whether to perform maintenance on the energy storage device. Active current reference value for control. Here, the controller is, for example, but is not limited to a proportional-integral controller.

In step S52, the reactive current reference value of the energy storage device may be determined based on the preset voltage reference value of the energy storage device and the acquired voltage of the energy storage device.

Here, the voltage reference value of the energy storage device can be set arbitrarily according to actual needs. For example, it can be the maximum voltage value of the energy storage device. During the control process of the energy storage device, the voltage of the energy storage device can be controlled to not exceed Energy storage device voltage reference value. The voltage of the energy storage device can be obtained through real-time collection.

In this step, if the voltage of the energy storage device is less than the energy storage device voltage reference value, it can be determined that the reactive current reference value of the energy storage device is 0; if the energy storage device voltage is greater than or equal to the energy storage device voltage reference value, then it can be Based on the difference between the energy storage device voltage and the energy storage device voltage reference value, the reactive current reference value of the energy storage device is determined.

Specifically, the difference between the preset energy storage device voltage reference value and the currently collected energy storage device voltage can be determined, and the difference can be input into the controller to determine the need for storage. The reactive current reference value can be controlled by the device. Here, the controller is, for example, but is not limited to a proportional-integral controller.

As an example, when the energy storage device is a flywheel energy storage unit, the energy storage device voltage reference value may be the field weakening ring control line voltage reference value of the flywheel energy storage unit, and the energy storage device voltage may be the flywheel motor line voltage.

In step S53, the quadrature-axis voltage reference value and the direct-axis voltage reference of the energy storage device can be determined based on the active current reference value and reactive current reference value of the energy storage device and the acquired active current and reactive current of the energy storage device. value.

Here, the active current and reactive current of the energy storage device can be obtained through real-time acquisition, or the three-phase current of the energy storage device can be converted into a two-phase current in the rotating coordinate system through coordinate system conversion (for example, Clarke transformation process) And sure.

As an example, when the energy storage device is a flywheel energy storage unit, the active current and reactive current of the flywheel energy storage unit may be determined based on the rotor angle of the flywheel energy storage unit and the three-phase current of the flywheel motor.

Specifically, the rotor angle of the flywheel energy storage unit and the three-phase current of the flywheel motor can be collected. In this way, based on the rotor angle, for example, through the Clarke transformation process, the three-phase current of the flywheel motor can be converted into two phases in the rotating coordinate system. Current, that is, the active current and reactive current of the flywheel motor.

After determining the active current reference value and reactive current reference value of the energy storage device and the active current and reactive current of the energy storage device, the active current and reactive current of the energy storage device can be controlled through voltage outer loop control and current inner loop control. The current reference value and the reactive current reference value are used as target values for current control of the energy storage device, thereby determining the quadrature axis voltage reference value and the direct axis voltage reference value of the energy storage device. Here, the quadrature axis and the direct axis may respectively correspond to the two coordinate axes in the rotating coordinate system, such as the q-axis and the d-axis.

In step S54, the energy storage device can be controlled to charge or discharge based on the quadrature axis voltage reference value and the direct axis voltage reference value to control the DC bus voltage.

In this step, the quadrature-axis voltage reference value and the direct-axis voltage reference value can be converted into the three-phase voltage reference value of the energy storage device through the inverse transformation of the coordinate system transformation described above (for example, the Clarke inverse transformation process) .

Based on the three-phase voltage reference value of the energy storage device, the charging or discharging of the energy storage device can be controlled through pulse width modulation (Pulse Width Modulation, PWM) control, thereby controlling the DC bus voltage.

Taking the structure shown in FIG. 3 as an example, when the energy storage device is a flywheel energy storage unit 310, the flywheel bridge circuit module 322 of the flywheel motor converter 320 can be controlled through PWM control to realize the control based on the DC bus voltage. The energy storage device is charged or utilized to discharge the DC bus voltage, thereby controlling the DC bus voltage to the DC bus voltage reference value mentioned in step S51.

The control process according to an exemplary embodiment of the present disclosure is described above with reference to FIG. 5 , the energy storage device may be connected to the DC bus of the wind turbine converter to allow the DC bus voltage to be controlled by controlling the charging or discharging of the energy storage device, such that , the control of the fan converter and the DC bus can be unbound, so that the fan converter can be used to implement other control processes and improve the controllability of the unit.

Taking the energy storage device as a flywheel energy storage unit as an example, the following describes the control process of the flywheel energy storage converter in detail with reference to Figure 6 .

As shown in Figure 6, the DC bus voltage error U _err between the two can be determined based on the preset DC bus voltage reference value U _ref and the obtained DC bus voltage U, and the flywheel energy storage can be determined through proportional integral control PI The active current reference value of the unit i _{fq_ref} .

The reactive current reference value i _{fd_ref} of the flywheel energy storage unit can be determined based on the preset field weakening ring control line voltage reference value U _flmax of the flywheel energy storage unit and the obtained flywheel motor line voltage U _fl .

Here, when the flywheel motor line voltage U _fl is greater than or equal to the field weakening ring control line voltage reference value U _flmax , the reactive current reference value i _{fd_ref} can be determined through proportional integral control PI based on the difference U _{f_err} between the two. .

The value of the flywheel energy storage unit can be determined based on the active current reference value i _{fq_ref} and reactive current reference value i _{fd_ref} of the flywheel energy storage unit and the acquired active current i _fq and reactive current i _fd of the flywheel motor of the flywheel energy storage unit. The quadrature axis voltage reference value v _{fq_ref} and the direct axis voltage reference value v _{fd_ref} .

Here, based on the rotor angle θ _r of the flywheel energy storage unit and the three-phase current I _fabc of the flywheel motor, the active current i _fq and the reactive current i _fd can be determined through inverse transformation of the coordinate system.

The three-phase voltage reference value V _{fabc_ref} of the flywheel energy storage unit can be determined based on the quadrature axis voltage reference value v _{fq_ref} and the direct axis voltage reference value v _{fd_ref} , and the charging or discharging of the flywheel energy storage unit can be controlled to control the DC bus voltage.

Based on the above control method for energy storage devices, the grid-side converter of the wind turbine converter can be unbound from the control of the DC bus voltage. In this way, other control processes can be implemented based on the grid-side converter to improve the performance of the unit. Controllability.

Two examples of control of the grid-side converter will be described below with reference to FIGS. 7 to 10 .

In one example, the grid-side converter of the wind turbine converter can be controlled based on the current source.

FIG. 7 is a schematic flowchart illustrating a first example of control of a grid-side converter in a method for controlling a wind turbine generator according to an exemplary embodiment of the present disclosure. FIG. 8 is a schematic flow chart illustrating an exemplary control method according to the present disclosure. Schematic diagram of a first example of control of the grid-side converter of the wind turbine generator set of the embodiment.

As shown in Figure 7, the control method of the wind turbine generator may also include the following steps.

In step S71, the direct-axis current reference value of the grid-side converter can be determined based on the preset grid-side active power reference value and the obtained grid-side active power.

Here, the grid-side active power reference value can be set arbitrarily according to actual needs, and it can be used as the control target value for the grid-side active power. The active power on the grid side can be obtained through real-time collection, which can be used as a feedback value.

In this step, as shown in Figure 8, the active power difference P _err between the two can be determined by comparing the preset grid-side active power reference value _Pref with the currently collected grid-side active power P, and can The active power difference P _err is input into the controller to determine the direct axis current reference value _{id_ref} for controlling the grid-side converter. Here, the controller is, for example, but is not limited to a proportional-integral controller (PI as shown in Figure 8).

In step S72, the quadrature-axis current reference value of the grid-side converter can be determined based on the preset grid-side reactive power reference value and the acquired grid-side reactive power.

Here, the grid-side reactive power reference value can be set arbitrarily according to actual needs, and it can be used as the control target value for the grid-side reactive power. The grid-side reactive power can be obtained through real-time collection, which can be used as a feedback value.

In this step, as shown in Figure 8, the reactive power difference Q _err between the two can be determined by comparing the preset grid-side reactive power reference value Q _ref with the currently collected grid-side reactive power Q. , and the reactive power difference value Q _err can be input into the controller to determine the quadrature axis current reference value i _{q_ref} for controlling the grid-side converter. Here, the controller is, for example, but is not limited to a proportional-integral controller (PI as shown in Figure 8).

In step S73, the grid-side converter can be controlled based on the direct-axis current reference value, the quadrature-axis current reference value, and the obtained grid-side three-phase voltage and grid-side three-phase current.

Here, the grid-side three-phase voltage and grid-side three-phase current can be obtained through real-time collection.

As an example, in this step, as shown in Figure 8, the grid phase angle θ can be determined based on the grid-side three-phase voltage V _abc through a phase-locked operation (for example, through a phase-locked loop (Phase Locked Loop, PLL) module) _grid . Based on the grid phase angle, the grid-side three-phase voltage V _abc and the grid-side three-phase current I _abc can be converted into grid-side two-phase voltages under the rotating coordinate system (for example, the Clarke transformation process), respectively. The direct axis voltage v _d and the quadrature axis voltage v _q as shown in Figure 8) and the two-phase current on the grid side (for example, the direct axis current i _d and the quadrature axis current i _q as shown in Figure 8).

As shown in Figure 8, the voltage can be calculated based on the three-phase voltage on the grid side, the three-phase current on the grid side, the two-phase voltage on the grid side, the two-phase current on the grid side, the grid phase angle, the direct-axis current reference value, and the quadrature-axis current reference value. Outer loop control and current inner loop control use the direct-axis current reference value and the quadrature-axis current reference value as the target values for the current control of the grid-side converter, thereby determining the operation of the grid-side converter in the two-phase stationary coordinate system. Voltage reference values v _{α_ref} and v _{β_ref} .

In this way, based on the voltage reference value of the grid-side converter in the two-phase stationary coordinate system and the grid phase angle, the grid-side converter can be converted into The voltage reference value of the converter in the two-phase stationary coordinate system is converted into the three-phase voltage reference value V _{gabc_ref} of the grid-side converter in the three-phase stationary coordinate system.

Therefore, as shown in Figure 8, the grid-side converter can be controlled through, for example, PWM control based on the three-phase voltage reference value V _{gabc_ref} of the grid-side converter, thereby achieving control of grid-side active power and grid-side reactive power. control.

In the existing control scheme, since the grid-side converter is bound to the control of the DC bus voltage, the grid-side active power cannot be controlled independently of the DC bus voltage. However, according to the control method described above with reference to Figures 7 and 8, on the one hand, the grid-side active power reference value can be preset according to actual needs, or in other words, the grid-side active power can be controlled independently of the DC bus voltage; on the other hand, the grid-side active power reference value can be preset according to actual needs; On the one hand, the grid-side active power and grid-side reactive power can also be decoupled and controlled, which improves the controllability of the unit.

In another example, the grid-side converter of the wind turbine converter can be controlled based on the voltage source.

FIG. 9 is a schematic flowchart illustrating a second example of control of a grid-side converter in a method for controlling a wind turbine generator according to an exemplary embodiment of the present disclosure. FIG. 10 is a schematic flow chart illustrating an exemplary control method for a wind turbine generator according to the present disclosure. Schematic diagram of a second example of control of the grid-side converter of the wind turbine generator according to the embodiment.

As shown in Figure 9, the control method of the wind turbine generator may also include the following steps.

In step S91, the grid phase angle reference value of the grid side converter can be determined based on the preset grid side active power reference value and grid rated angular velocity and the obtained grid side active power and grid angular velocity.

Here, the grid-side active power reference value can be set arbitrarily according to actual needs, and it can be used as the control target value for the grid-side active power. The active power on the grid side can be obtained through real-time collection, which can be used as a feedback value. The rated angular speed of the power grid can be set according to the actual power grid, and the angular speed of the power grid can be obtained through real-time collection.

In this step, as shown in Figure 10, on the one hand, the power difference between the network side active power reference value _Pref and the network side active power P can be determined by comparing the two. On the other hand, the active power and frequency droop relationship can be determined by comparing the grid rated angular velocity ω ₀ with the grid angular velocity ω, for example represented by the coefficient K _ω . Closed-loop control and grid angular velocity ω ₀ feedforward control are realized through the proportional coefficient Jω ₀ ^-1 , integral and feedback coefficient D, and the angular velocity reference value is obtained

In this way, by diagonal velocity reference value

Perform integration to obtain the grid phase angle reference value.

However, the method of determining the power grid phase angle reference value is not limited to the above process, and can also be determined by other methods.

In step S92, the grid-side voltage amplitude reference value of the grid-side converter can be determined based on the preset grid-side reactive power reference value and the obtained grid-side reactive power.

In this step, as shown in Figure 10, the reactive power and voltage droop coefficient n can be determined by comparing the preset grid-side reactive power reference value Q _ref and the obtained grid-side reactive power Q. The grid-side voltage amplitude reference value can be determined by comparing the reactive power and voltage droop coefficient n with the rated voltage reference value U ₀

In step S93, the grid-side converter can be controlled based on the grid phase angle reference value and the grid-side voltage amplitude reference value.

In this step, the three-phase voltage reference value of the grid-side converter can be generated through voltage and current inner loop control based on the grid phase angle reference value and the grid-side voltage amplitude reference value. The three-phase voltage reference value of the grid-side converter can be transformed into a coordinate system to obtain the voltage reference values U _αref and U _βref of the grid-side converter in the two-phase static coordinate system, so that the grid-side converter can be controlled. To achieve control of grid-side active power and grid-side reactive power.

Figures 8 and 10 respectively show the current source type and voltage source type grid-side converter control methods. According to these two control methods, the grid-side controller of the wind turbine converter can be flexibly switched according to the grid connection requirements of the unit. .

The grid connection demand can be determined based on the grid short-circuit impedance ratio SCR. In the case of a strong grid (SCR>=2), the grid-side control of the unit can adopt the current source control mode shown in Figure 8. In the case of a weak grid (SCR<2) , the grid-side control of the unit can adopt the voltage source control mode shown in Figure 10. In this way, switching the grid-side control mode based on the above control method can improve the grid-connected capability of the unit, improve the adaptability of the weak grid and the strong grid, and solve the existing problem of The solution cannot realize the problem of free switching between grid-side voltage source control and current source control.

In addition, according to exemplary embodiments of the present disclosure, since the stability of the DC bus voltage can be controlled through the energy storage device, the grid-side control of the unit can be allowed to flexibly switch between the current source control mode and the voltage source control mode.

In the control method for the grid-side converter described above with reference to Figures 7 to 10, under different grid operating conditions, the grid-side active power reference value and the grid-side reactive power can be determined according to the grid operating conditions. Reference.

In one example, during the period when the wind turbine generator set experiences high voltage/low voltage fault ride-through, the grid-side active power reference value _Pref and the grid-side reactive power reference value Q _ref can be set according to the high and low grid voltage conditions and in accordance with wind farm requirements.

For example, in response to a high-voltage fault or a low-voltage fault occurring in a wind turbine, the grid-side active power reference value and the grid-side reactive power reference value can be determined based on the preset apparent power.

Specifically, during the high voltage/low voltage fault ride-through period of the wind turbine, if reactive power priority is set, the maximum amplitude P _max of the active power reference value can be limited by the following equation (1).

During the period when the wind turbine generator set experiences high voltage/low voltage fault ride-through, if active power priority is set, the maximum amplitude Q _max of the reactive power reference value can be limited by the following equation (2).

In the above equations (1) and (2), S is the preset apparent power.

In addition, during the period when the wind turbine generator experiences a high voltage/low voltage fault ride-through, the grid-side active current reference values I _{P_ref} and corresponding to the grid-side active power reference value P _ref and the grid-side reactive power reference value Q _ref can also be directly set. Grid side reactive current reference value I _{Q_ref} .

In another example, during the period when the wind turbine generator set experiences inertia response, the grid-side active power reference value can be determined by: obtaining the grid-side active power reference value and the inertia response power of the wind turbine generator set before the inertia response; based on the inertia response The grid-side active power reference value and inertia response power before are determined to determine the grid-side active power reference value of the wind turbine after inertia response.

Specifically, taking the control modes shown in Figures 7 and 8 as an example, the grid-side active power reference value P _ref may include the grid-side active power reference value P _ref0 before inertia response and the inertia response power

in,

is the power grid frequency change rate; k _i is the inertia constant, which can be set according to the active support requirements of the wind farm's response to inertia.

In this way, during the period when the wind turbine generator set experiences inertia response, the grid-side active power reference value _Pref can be determined by the following equation (3).

In yet another example, during the period when the wind turbine generator undergoes a frequency regulation, the grid-side active power reference value can be determined in the following manner: obtain the grid-side active power reference value and the primary frequency regulation power of the wind turbine generator before the primary frequency regulation; based on the primary frequency regulation The grid-side active power reference value and primary frequency modulation power are determined before the grid-side active power reference value of the wind turbine after primary frequency modulation.

Specifically, taking the control modes shown in Figures 7 and 8 as an example, the grid-side active power reference value P _ref may include the grid-side active power reference value P _ref0 before primary frequency modulation and the primary frequency modulation power k _f Δf, where, Δf is the frequency deviation of the power grid; k _f is the frequency regulation constant, which can be set according to the active power support requirements of the wind farm for primary frequency regulation.

In this way, during a period of frequency regulation of the wind turbine generator, the grid-side active power reference value _Pref can be determined through the following equations (4) and (5).

P _ref =P _ref0 +k _i Δf (4)

Δf＝f _rate -f (5)

Among them, f _rate is the rated frequency of the power grid, which can be 50Hz or 60Hz, for example, and f is the actual grid frequency value.

The above describes the method for determining the grid-side active power reference value of the wind turbine during primary frequency regulation. During the second frequency regulation of the wind turbine, the grid-side active power reference value can be determined in the following way: Obtain the grid-side active power of the wind turbine. The power command value and the unit’s current grid-connected active power command value; determine the grid-side active power reference value based on the grid-side active power command value and the unit’s current grid-connected active power command value.

Specifically, taking the control modes shown in Figures 7 to 10 as an example, the grid-side active power command value P _s during the secondary frequency regulation can be issued through the dispatching system. This command value can be specified according to the needs of the secondary frequency regulation. . The current grid-connected active power command value P _ref0 can be obtained according to the command issuance record.

In this way, during the period when the wind turbine generator set undergoes secondary frequency regulation, the grid-side active power reference value _Pref can be determined through the following equation (6).

P _ref =P _ref0 +P _s (6)

Based on the example described above, it can be solved that in the existing control scheme, due to the inability to get rid of the constraints of the balance between machine-side power and grid-side power, it leads to complex problems in realizing active power support functions such as unit inertia response, primary frequency modulation, and secondary frequency modulation. According to exemplary embodiments of the present disclosure, independent control of the grid-side power can be achieved by decoupling the control of the grid-side power and the DC bus voltage, thereby getting rid of the constraints of the balance between the machine-side power and the grid-side power, allowing the implementation Higher unit controllability, especially under different power grid operating conditions, the grid-side active power reference value can be set according to current operating conditions.

In addition to the working conditions mentioned above, the grid-side active power reference value can also be determined based on other working conditions.

In the case of power prediction compensation for wind turbines, the grid-side active power reference value can be determined in the following ways: predict the unit forecast power of the wind turbine unit; determine the grid-side active power reference value based on the unit forecast power.

Specifically, the unit power P _c can be predicted through any prediction system, and the grid-side power reference P _ref can be controlled to be equal to the predicted power, that is, P _ref =P _c .

In addition, according to exemplary embodiments of the present disclosure, since the DC bus voltage can be controlled by controlling the charging or discharging of the energy storage device, so that the grid-side power and the machine-side power of the wind turbine are decoupled, therefore, the wind turbine converter can be The controller controls the grid-side power, that is, setting a fixed grid-side power reference value, the power of the wind turbine can be smoothed, and the existing control scheme solves the problem of grid-connected power (or grid-side power) when the wind speed changes in the existing control scheme. ) is unable to output smoothly.

In addition, according to exemplary embodiments of the present disclosure, since the DC bus voltage can be controlled by controlling the charging or discharging of the energy storage device, the grid-side power and machine-side power of the wind turbine generator set are decoupled. Therefore, when the reactive power of the generator set is required, In the case of power support, according to the reactive power dispatching requirements in the wind farm, when the unit needs to emit reactive power, the grid-side reactive power reference value can be set according to the dispatching requirements, which improves the control of grid-side reactive power. Controllability.

In addition, according to exemplary embodiments of the present disclosure, since the DC bus voltage can be controlled by controlling the charging or discharging of the energy storage device, the DC bus voltage can be controlled to remain stable. Therefore, in the black start control mode of the wind turbine generator, Make sure the unit can start normally.

The control process of the energy storage device of the wind turbine set according to the exemplary embodiment of the present disclosure is described above with reference to FIGS. 2 to 6 , and the wind turbine set according to the exemplary embodiment of the present disclosure is described with reference to FIGS. 7 to 10 The control process of the grid-side converter. Furthermore, according to exemplary embodiments of the present disclosure, the control of the machine-side converter may be combined with the above-mentioned control processes of FIGS. 2 to 10 .

FIG. 11 shows a control process of a machine-side converter of a wind turbine generator according to an exemplary embodiment of the present disclosure. FIG. 12 shows a schematic block diagram of control of a machine-side converter of a wind turbine according to an exemplary embodiment of the present disclosure.

As shown in FIG. 11 , the control method according to an exemplary embodiment of the present disclosure may further include the following steps.

In step S111, the output active current reference value of the generator may be determined based on the preset maximum active power and the obtained output active power of the generator of the wind turbine generator.

Here, the maximum active power can be set arbitrarily according to actual needs, and it can be used as a control target value for the output active power of the generator. The output active power of the generator can be obtained through real-time collection.

In this step, as shown in Figure 12, the difference _{PG_err} between the two can be determined by comparing the preset maximum active power P _MPPT with the current output active power _PG of the generator, and the difference P can be _{G_err} is input into the controller to determine the active current reference value i _{Gq_ref} that controls the output active power of the generator. Here, the controller is, for example, but is not limited to a proportional-integral controller.

In addition, the active power P _MPPT is determined by maximum power point tracking (MPPT) based on the angular frequency ω _Gr of the wind turbine generator.

In step S112, the output reactive current reference value of the generator may be determined based on the preset generator voltage reference value and the obtained generator voltage.

Here, the generator voltage reference value can be set arbitrarily according to actual needs. For example, it can be the maximum set value of the generator's field weakening voltage. In the process of controlling the generator, the generator's field weakening voltage can be controlled as Do not exceed the generator voltage reference value. The generator voltage can be obtained through real-time collection, which can be a feedback value.

In this step, as shown in Figure 12, if the generator voltage U _Gl is less than the generator voltage reference value U _Glmax , it can be determined that the generator's output reactive current reference value is 0; if the generator voltage U _Gl is greater than or equal to Generator voltage reference value U _Glmax , then the output reactive current reference value of the generator can be determined based on the difference between the generator voltage U _Gl and the generator voltage reference value U _Glmax .

Specifically, the difference U _err between the two can be determined by comparing the preset generator voltage reference value U _Glmax with the currently collected generator voltage U _Gl , and the difference U _err can be input into the controller. , thereby determining the reactive current reference value i _{Gd_ref} that controls the generator voltage. Here, the controller is, for example, but is not limited to a proportional-integral controller.

In step S113, the quadrature-axis voltage reference value and the direct-axis voltage reference value of the generator may be determined based on the output active current reference value, the output reactive current reference value, and the acquired active current and reactive current of the generator.

Here, the active current and reactive current of the generator can be obtained through real-time acquisition, or can be determined by converting the three-phase current of the generator into the two-phase current in the rotating coordinate system through coordinate system transformation (for example, Clarke transformation process) .

Specifically, as shown in Figure 12, the rotor angle θ _Gr of the generator and the three-phase current I _Gabc of the generator can be collected. In this way, based on the rotor angle θ _Gr , for example, through the Clarke transformation process, the three-phase current of the generator can be The current I _Gabc is converted into two-phase currents in the rotating coordinate system, that is, the active current i _Gq and the reactive current i _Gd of the generator.

After determining the active current reference value and reactive current reference value of the generator and the active current and reactive current of the generator, the active current reference value of the generator can be controlled through voltage outer loop control and current inner loop control. and the reactive current reference value as the target value for current control of the generator, thereby determining the quadrature axis voltage reference value v _{Gq_ref} and the direct axis voltage reference value v _{Gd_ref} of the generator. Here, the quadrature axis and the direct axis may respectively correspond to the two coordinate axes in the rotating coordinate system, such as the q-axis and the d-axis.

In step S114, the machine-side converter may be controlled based on the quadrature axis voltage reference value and the direct axis voltage reference value of the generator to control the output active power of the generator.

In this step, the quadrature-axis voltage reference value _{vGq_ref} and the direct-axis voltage reference value can be transformed based on the rotor angle θ _Gr of the generator through an inverse transformation of the coordinate system transformation described above (for example, the Clarke inverse transformation process) v _{Gd_ref} is converted into the three-phase voltage reference value V _{Gabc_ref} of the generator.

The output power of the generator can be controlled through PWM control based on the three-phase voltage reference value V _{Gabc_ref} of the generator.

According to exemplary embodiments of the present disclosure, since the DC bus voltage can be controlled through the energy storage device and the grid-side power can be controlled through the grid-side converter of the wind turbine converter, machine-side power and grid-side power can be achieved Decoupling control allows the machine-side converter of the wind turbine converter to achieve maximum power tracking without being constrained by the balance of machine-side active power and grid-side active power, improving the controllability of the unit.

According to a third aspect of the present disclosure, a computer device is provided, which may include a processor and a memory.

Specifically, memory may be used to store program code and transmit the program code to the processor. The processor may be configured to execute the control method of the wind turbine generator according to the present disclosure according to the instructions in the program code.

As an example, the computer device may be connected to the controller of the energy storage device, the controller of the converter in the wind turbine generator set, or the main controller of the wind turbine generator set; alternatively, the computer device may be provided at the controller of the energy storage device Or in the controller of the converter in the wind turbine.

According to a fourth aspect of the present disclosure, a wind turbine generator set is provided, which may include a control device for a wind turbine generator set according to the present disclosure, or a computer device according to the present disclosure.

As examples, the wind turbine may be a direct drive wind turbine, a semi-direct drive wind turbine or a doubly-fed wind turbine.

Figure 13 shows a schematic diagram of an example in which the wind turbine is a doubly-fed wind turbine. As shown in FIG. 13 , the output end of the wind turbine converter of the wind power generator set may be connected to the first power grid 410 , and the output end of the generator G may be connected to the second power grid 420 .

According to the control method of the wind turbine generator and the wind turbine generator set according to the exemplary embodiments of the present disclosure, the energy storage device may be connected to the DC bus of the wind turbine converter to allow the DC bus voltage to be controlled by controlling charging or discharging of the energy storage device. , in this way, the control of the wind turbine converter and the DC bus can be unbound, so that the wind turbine converter can be used to implement other control processes, and the wind turbine grid-connected power can be highly controllable and the grid-connected capacity of the wind turbine unit can be achieved (i.e., the wind turbine converter can be connected to the grid). Grid adaptability) to solve the current deficiencies in conventional control functions to achieve grid-connected suitability of wind turbines and a high degree of controllability of active power.

In addition, since the DC bus voltage can be controlled by controlling the energy storage device according to the control method of the wind turbine generator set and the wind turbine generator set according to the exemplary embodiments of the present disclosure, the wind turbine generator set can be allowed to operate under maximum wind power tracking, achieving and The grid-connected power of the unit is fully controllable.

In addition, according to the wind turbine control method and the wind turbine set according to the exemplary embodiments of the present disclosure, the machine-side power and the grid-side power can be decoupled and controlled, thereby solving the problems of wind turbine inertia response, primary frequency modulation, and secondary frequency modulation. Active support problem.

In addition, according to the control method of the wind turbine generator set and the wind turbine generator set according to the exemplary embodiments of the present disclosure, it is possible to realize that the grid-side power of the unit converter does not change with the unit-side power, thereby achieving grid-side power smoothing.

In addition, according to the wind turbine control method and the wind turbine according to the exemplary embodiments of the present disclosure, because the DC bus voltage can be controlled by controlling the energy storage device, conventional voltage sources and currents in the case of wind turbines connected to the grid can be realized Free switching of source control mode.

In addition, according to the control method of the wind turbine generator set and the wind turbine generator set according to the exemplary embodiments of the present disclosure, the active power control problem during high voltage/low voltage fault ride-through can be solved, and the DC bus voltage can be controlled only by controlling the energy storage device, There is no need to activate the braking unit, there is no power loss, and the high voltage/low voltage fault ride-through capability is improved.

In addition, according to the control method of the wind turbine generator set and the wind turbine generator set according to the exemplary embodiments of the present disclosure, the DC bus voltage can be controlled by controlling the energy storage device, so that the black start of the wind turbine generator set can be achieved.

In addition, according to the wind turbine control method and the wind turbine set according to the exemplary embodiments of the present disclosure, the energy storage device can be controlled to ensure the stability of the DC bus voltage, thereby optimizing the grid-connected power quality and solving the problems caused by wind power tracking. subharmonic problem.

In addition, the control method of the wind turbine generator set and the wind turbine generator set according to the exemplary embodiments of the present disclosure can allow decoupling control of the grid-side power and the machine-side power, so that the grid-side power can be controlled according to the wind power prediction value, thereby Helps improve wind power prediction accuracy.

In addition, according to the wind turbine control method and the wind turbine set according to the exemplary embodiments of the present disclosure, since the grid-side power and the machine-side power can be decoupled and controlled, it is easier to realize the grid-connected control mode and the off-grid control of the wind turbine set. Free switching between modes.

In addition, according to the wind turbine control method and the wind turbine set according to the exemplary embodiments of the present disclosure, the energy storage device can be controlled to ensure the stability of the DC bus voltage, so that the unit can be connected to the grid without being limited to the braking unit. Reactive power support capacity.

In addition, according to the wind turbine control method and the wind turbine set according to the exemplary embodiments of the present disclosure, the grid-side control can be flexibly switched to the current source or voltage control mode, thereby greatly improving the grid connection capability of the wind turbine set and improving wind power generation. The adaptability of the unit to weak grid.

The features, structures, or characteristics described in this disclosure may be combined in any suitable manner in one or more embodiments. In the above description, numerous specific details are provided to provide a thorough understanding of the embodiments of the disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of the specific details recited, or that other methods, components, materials, etc. may be employed. In other instances, well-known structures, materials, or operations have not been shown or described in detail to avoid obscuring aspects of the disclosure.

The specific embodiments of the present disclosure have been described in detail above. Although some embodiments have been shown and described, those skilled in the art will understand that they can implement the present disclosure without departing from the principles and spirit of the disclosure as defined by the claims and their equivalents. Under the circumstances, modifications and variations can be made to these embodiments, and these modifications and variations should also be within the protection scope of the claims of the present disclosure.

Claims

A control method for a wind turbine, characterized in that the wind turbine includes a wind turbine converter and an energy storage device, the energy storage device is connected to the DC bus of the wind turbine converter, and the control method includes :

Based on the preset DC bus voltage reference value and the obtained DC bus voltage, determine the active current reference value of the energy storage device;

Based on the preset energy storage device voltage reference value and the obtained energy storage device voltage, determine the reactive current reference value of the energy storage device;

Based on the active current reference value and reactive current reference value of the energy storage device and the obtained active current and reactive current of the energy storage device, the quadrature axis voltage reference value and the direct axis voltage of the energy storage device are determined Reference;

Based on the quadrature axis voltage reference value and the direct axis voltage reference value, the energy storage device is controlled to charge or discharge to control the DC bus voltage.
The control method according to claim 1, characterized in that the step of determining the reactive current reference value of the energy storage device includes:

If the voltage of the energy storage device is less than the voltage reference value of the energy storage device, the reactive current reference value of the energy storage device is 0;

If the energy storage device voltage is greater than or equal to the energy storage device voltage reference value, then the reactive current of the energy storage device is determined based on the difference between the energy storage device voltage and the energy storage device voltage reference value. Reference.
The control method according to claim 1, characterized in that the wind turbine converter includes a grid-side converter, wherein the control method further includes:

Based on the preset grid-side active power reference value and the obtained grid-side active power, determine the direct-axis current reference value of the grid-side converter;

Based on the preset grid-side reactive power reference value and the acquired grid-side reactive power, determine the quadrature-axis current reference value of the grid-side converter;

Based on the direct-axis current reference value, the quadrature-axis current reference value and the obtained grid-side three-phase voltage and grid-side three-phase current, the grid-side converter is controlled to control the grid-side active power and grid-side Reactive power is controlled.
The control method according to claim 1, characterized in that the wind turbine converter includes a grid-side converter, wherein the control method further includes:

Based on the preset grid-side active power reference value and grid rated angular velocity and the obtained grid-side active power and grid angular velocity, determine the grid phase angle reference value of the grid-side converter;

Based on the preset grid-side reactive power reference value and the obtained grid-side reactive power, determine the grid-side voltage amplitude reference value of the grid-side converter;

The grid-side converter is controlled based on the grid phase angle reference value and the grid-side voltage amplitude reference value.
The control method according to claim 1, characterized in that the wind turbine converter includes a machine-side converter, wherein the control method further includes:

Based on the preset maximum active power and the obtained output active power of the generator of the wind turbine generator, determine the output active current reference value of the generator;

Based on the preset generator voltage reference value and the obtained generator voltage, determine the output reactive current reference value of the generator;

Based on the output active current reference value, the output reactive current reference value and the obtained active current and reactive current of the generator, the quadrature axis voltage reference value and the direct axis voltage reference value of the generator are determined ;

Based on the quadrature axis voltage reference value and the direct axis voltage reference value of the generator, the machine-side converter is controlled to control the output active power of the generator.
The control method according to claim 3 or 4, characterized in that the grid-side active power reference value and the grid-side reactive power reference value are determined in the following manner:

In response to a high voltage fault or a low voltage fault occurring in the wind turbine generator set, the grid-side active power reference value and the grid-side reactive power reference value are determined based on the preset apparent power.
The control method according to claim 3 or 4, characterized in that the grid-side active power reference value is determined in the following manner:

Obtain the grid-side active power reference value and the inertia response power of the wind turbine generator before inertia response; and based on the grid-side active power reference value before the inertia response and the inertia response power, determine that the wind turbine generator is in The grid-side active power reference value after the inertia response; or

Obtain the grid-side active power reference value and primary frequency modulation power of the wind turbine generator before primary frequency modulation; and based on the grid-side active power reference value before primary frequency modulation and the primary frequency modulation power, determine whether the wind turbine generator is in The grid-side active power reference value after primary frequency modulation; or,

Obtain the grid-side active power command value of the wind turbine generator set and the unit's current grid-connected active power command value; determine the grid-side active power command value based on the grid-side active power command value and the unit's current grid-connected active power command value. Power reference value.
A computer device, characterized in that the computer device includes a processor and a memory:

The memory is used to store program code and transmit the program code to the processor;

The processor is configured to execute the control method of a wind turbine generator set according to any one of claims 1-7 according to instructions in the program code.
The computer equipment according to claim 8, characterized in that the computer equipment is connected to a controller of the energy storage device, a controller of a converter in the wind turbine generator set, or a main controller of the wind turbine generator set. controller; or,

The computer device is provided in the controller of the energy storage device or the controller of the converter in the wind turbine generator set.
A wind power generator set, characterized in that the wind power generator set includes the computer device according to claim 8 or 9.
The wind turbine generator set according to claim 10, characterized in that the wind turbine generator set is a direct drive wind turbine generator set, a semi-direct drive wind turbine generator set or a doubly-fed wind turbine generator set.