Mesh construction type fan frequency support control method, device and equipment and medium

Abstract

The invention discloses a network construction type fan frequency support control method, device and equipment and a medium, and the method comprises the steps: after obtaining disturbance information, determining an active power reference value of a virtual synchronous machine based on the disturbance information and a frequency response model of a network side converter, and then obtaining a power reference value of a fan side converter based on the disturbance information; the grid-side converter adjusts the fan according to the active power reference value of the virtual synchronous machine, and the machine-side converter adjusts the fan according to the power reference value of the machine-side converter; therefore, when the system is disturbed, the grid-side converter slows down the disturbance degree under the direct voltage control and the virtual synchronous control, and then in order to eliminate the disturbance, the machine-side converter adjusts the active power output instruction of the fan according to the disturbed information, so that the frequency stability of the system is effectively improved.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, and in particular to a frequency support control method, device, equipment and medium for a grid-type wind turbine. Background Art

[0002] At present, after the widespread access of wind power to the power grid, the inertia level of the system has been greatly reduced, posing a certain threat to the frequency stability of the system. The operating regulations of power grids in various countries require that grid-connected wind turbines can provide a certain inertia response and frequency support. In this context, the control strategy of wind turbines participating in system frequency support has received widespread attention.

[0003] By releasing the kinetic energy of the wind turbine rotor, the wind turbine can provide frequency support for the system under zero standby conditions, taking into account both economy and frequency support performance. Power-frequency droop control is a commonly used zero-standby frequency control strategy for wind turbines. Under this strategy, the steady-state operating point of the wind turbine will deviate from the initial operating point (MPPT point), causing the captured wind power to be reduced for a long time. Therefore, in view of the shortcomings in the existing technology, how to enable the wind turbine to automatically recover to the initial operating point under the existing power-frequency droop control is an urgent problem to be solved. Summary of the invention

[0004] The present invention provides a frequency support control method, device, equipment and medium for a grid-type wind turbine. When the system is disturbed, the method first reduces the degree of disturbance through the grid-side converter, and then adjusts the active output command of the wind turbine through the machine-side converter to eliminate the disturbance, thereby effectively improving the system stability.

[0005] An embodiment of the present invention provides a frequency support control method for a grid-type wind turbine, comprising:

[0006] Obtaining basic parameters of the system and real-time DC voltage deviation values; wherein the basic parameters include virtual inertia, damping coefficient, DC capacitor size, DC voltage rating, power-DC voltage droop coefficient, wind turbine power constant, and wind turbine speed;

[0007] According to the acquired data, a mathematical model of grid-connected converter based on direct voltage control and virtual synchronous machine is established;

[0008] Determining a frequency response model of a grid-side converter according to the grid-type converter mathematical model;

[0009] Determining a virtual synchronous machine active power reference value according to the real-time DC voltage deviation value and the frequency response model;

[0010] The additional power of the machine-side converter of the wind turbine is calculated according to the power-DC voltage droop coefficient and the DC voltage deviation value;

[0011] Calculate a reference value of the machine-side converter power of the wind turbine according to the power constant of the wind turbine, the speed of the wind turbine and the additional power of the machine-side converter;

[0012] The wind turbine is adjusted according to the virtual synchronous machine active power reference value and the machine-side converter power reference value.

[0013] Furthermore, the grid-type converter mathematical model includes:

[0014]

[0015] Among them, H V Indicates virtual inertia; D V represents the damping coefficient; Δω is the angular velocity deviation; ΔP m Indicates the active power reference value of the virtual synchronous machine; ΔP e Indicates the actual deviation value of the virtual synchronous machine; k p Represents the proportional coefficient of the PI controller; k i Indicates the integral coefficient of the PI controller; C is the DC capacitor size; ΔV dc Indicates the DC voltage deviation value; ΔV dc0 Indicates the DC voltage rating.

[0016] Furthermore, determining the frequency response model of the grid-side converter according to the grid-type converter mathematical model includes:

[0017] Combining various equations in the mathematical model of the grid-type converter, taking the angular velocity deviation value and the active power reference value of the virtual synchronous machine in the mathematical model of the grid-type converter as variables of the transfer function, and solving to obtain the power-frequency response transfer function of the grid-side converter;

[0018] Determining a first time constant value according to the DC capacitor, the virtual inertia, the damping coefficient, and the DC voltage rated value;

[0019] Determining a proportional relationship between a proportional coefficient of a PI controller and an integral coefficient of the PI controller according to the virtual inertia, the damping coefficient and the first time constant;

[0020] Determining a second time constant value according to the proportional relationship;

[0021] Based on the first time constant, the second time constant and the power-frequency response transfer function of the grid-side converter, a frequency response model of the grid-side converter is obtained by solving.

[0022] Furthermore, the frequency response model of the grid-side converter is specifically:

[0023]

[0024] In the formula, H V Indicates virtual inertia; D V represents the damping coefficient; Δω represents the angular velocity deviation; ΔP m Indicates the active power reference value of the virtual synchronous machine; ΔP e Indicates the actual deviation value of the virtual synchronous machine; T R Represents the first time constant value; T H Indicates the second time constant value.

[0025] Further, the calculating of the additional power of the machine-side converter of the wind turbine according to the power-DC voltage droop coefficient and the DC voltage deviation value includes:

[0026] The additional power of the machine-side converter is obtained by solving the following formula:

[0027] P add =-K v ΔV dc ;

[0028] In the formula, K v Indicates power-DC voltage droop coefficient, ΔV dc Indicates the DC voltage deviation value.

[0029] Further, the calculating of the reference value of the machine-side converter power of the wind turbine according to the power constant of the wind turbine, the speed of the wind turbine and the additional power of the machine-side converter comprises:

[0030] According to the power constant of the wind turbine and the speed of the wind turbine, an MPPT power reference value is obtained;

[0031] The MPPT power reference value is integrated with the machine-side converter additional power to calculate and obtain the machine-side converter power reference value of the wind turbine.

[0032] Furthermore, the power reference value of the computer-side converter is calculated by the following formula:

[0033] P ref =k g ω r 3 -K v ΔV dc ;

[0034] In the formula, K g Represents the power constant of the fan; ω r Indicates the wind turbine speed; K v Indicates power-DC voltage droop coefficient, ΔV dc Indicates the DC voltage deviation value.

[0035] An embodiment of the present invention further provides a grid-type wind turbine frequency support control device, comprising: a data acquisition module, a converter mathematical model construction module, a frequency response model determination module, a virtual synchronous machine active power reference value acquisition module, a machine-side converter additional power calculation module, a machine-side converter power reference value calculation module, and an adjustment module;

[0036] The data acquisition module is used to acquire basic parameters of the system and real-time DC voltage deviation value; wherein the basic parameters include virtual inertia, damping coefficient, DC capacitor size, DC voltage rating, power-DC voltage droop coefficient, wind turbine power constant and wind turbine speed;

[0037] The converter mathematical model building module is used to build a grid-type converter mathematical model based on direct voltage control and virtual synchronous machine according to the acquired data;

[0038] The frequency response model determination module is used to determine the frequency response model of the grid-side converter according to the grid-type converter mathematical model;

[0039] The virtual synchronous machine active power reference value acquisition module is used to determine the virtual synchronous machine active power reference value according to the real-time DC voltage deviation value and the frequency response model;

[0040] The machine-side converter additional power calculation module is used to calculate the machine-side converter additional power of the wind turbine according to the power-DC voltage droop coefficient and the DC voltage deviation value;

[0041] The machine-side converter power reference value calculation module is used to calculate the machine-side converter power reference value of the wind turbine according to the power constant of the wind turbine, the speed of the wind turbine and the additional power of the machine-side converter;

[0042] The regulating module is used to regulate the wind turbine according to the active power reference value of the virtual synchronous machine and the power reference value of the machine-side converter.

[0043] The present application also provides a terminal device, including:

[0044] one or more processors;

[0045] A memory, coupled to the processor, for storing one or more programs;

[0046] When the one or more programs are executed by the one or more processors, the one or more processors implement the grid-type wind turbine frequency support control method as described in the above-mentioned embodiment of the invention.

[0047] The present application also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the frequency support control method for a grid-type wind turbine as described in the above-mentioned embodiment of the invention is implemented.

[0048] The following beneficial effects are achieved by implementing the present invention:

[0049] The present invention provides a frequency support control method, device, equipment and medium for a grid-type wind turbine. After obtaining disturbance information, the method first constructs a grid-type converter mathematical model based on direct voltage control and a virtual synchronous machine, and determines a frequency response model of a grid-side converter based on the grid-type converter mathematical model, so that the frequency response model determines the active power reference value of the virtual synchronous machine according to the real-time DC voltage deviation value; then, in terms of the machine-side converter, the additional power of the computer-side converter and the MPPT power reference value are calculated respectively to obtain the machine-side converter power reference value of the wind turbine; further, the grid-side converter adjusts the wind turbine according to the virtual synchronous machine active power reference value, and the machine-side converter adjusts the wind turbine according to the machine-side converter power reference value;

[0050] Therefore, when the system is disturbed, the grid-side converter will first reduce the degree of disturbance under direct voltage control and virtual synchronous control. Then, in order to eliminate the disturbance, the machine-side converter will adjust the active output command of the wind turbine according to the disturbance information, thereby achieving system stability. Compared with the existing control strategy, the control performance is better, which is conducive to making full use of the frequency support capability of the wind turbine and improving the frequency stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the implementation manner will be briefly introduced below. Obviously, the drawings described below are only some implementation manners of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0052] Figure 1 It is a flow chart of a frequency support control method for a grid-type wind turbine provided in a certain embodiment of the present application;

[0053] Figure 2 It is a schematic diagram of the control structure topology provided by a certain embodiment of the present application;

[0054] Figure 3 is a topological diagram of a test system provided by a certain embodiment of the present application;

[0055] Figure 4 It is a dynamic response curve of a wind turbine grid-connected system under a continuous disturbance scenario provided by a certain embodiment of the present application;

[0056] Figure 5 It is a wind turbine speed-active power trajectory diagram under a continuous disturbance scenario provided by a certain embodiment of the present application;

[0057] Figure 6 It is a structural schematic diagram of a grid-type fan frequency support control device provided in a certain embodiment of the present application;

[0058] Figure 7 It is a structural diagram of a terminal device provided in a certain embodiment of the present application. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0061] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0062] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0063] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0064] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0065] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0066] See also Figure 1 , is a flow chart of a grid-type wind turbine frequency support control method provided by an embodiment of the present invention, comprising:

[0067] S1. Obtaining basic parameters of the system and real-time DC voltage deviation value; wherein the basic parameters include virtual inertia, damping coefficient, DC capacitor size, DC voltage rating, power-DC voltage droop coefficient, wind turbine power constant and wind turbine speed;

[0068] S2. According to the acquired data, a mathematical model of a grid-connected converter based on direct voltage control and a virtual synchronous machine is established;

[0069] In a preferred embodiment, the grid-type converter mathematical model includes:

[0070]

[0071] Among them, H V Indicates virtual inertia; D V represents the damping coefficient; Δω is the angular velocity deviation; ΔP m Indicates the active power reference value of the virtual synchronous machine; ΔP e Indicates the actual deviation value of the virtual synchronous machine; k p Represents the proportional coefficient of the PI controller; k i Indicates the integral coefficient of the PI controller; C is the DC capacitor size; ΔV dc Indicates the DC voltage deviation value; ΔV dc0 Indicates the DC voltage rating;

[0072] Specifically, assuming that the power of the generator-side converter remains unchanged and the DC voltage fluctuates within a small range around the rated value, the equation of the active circuit of the grid-side converter can be written as formula (1).

[0073] S3. Determine a frequency response model of a grid-side converter according to the mathematical model of the grid-type converter;

[0074] In a preferred embodiment, determining the frequency response model of the grid-side converter according to the grid-type converter mathematical model includes:

[0075] Combining various equations in the mathematical model of the grid-type converter, taking the angular velocity deviation value and the active power reference value of the virtual synchronous machine in the mathematical model of the grid-type converter as variables of the transfer function, and solving to obtain the power-frequency response transfer function of the grid-side converter;

[0076] Specifically, the angular velocity deviation value and the active power reference value of the virtual synchronous machine in the mathematical model of the grid-type converter in S1 are used as variables of the transfer function, and equation (1) is simplified to obtain the power-frequency response transfer function of the grid-side converter;

[0077] The power-frequency response transfer function of the grid-side converter is as follows:

[0078]

[0079] Then, from formula (2), we can get formula (3):

[0080]

[0081] Determining a first time constant value according to the DC capacitor, the virtual inertia, the damping coefficient, and the DC voltage rated value;

[0082] Specifically, it is necessary to configure appropriate control parameters to reduce the order of equation (3);

[0083] Therefore, according to the DC capacitor size, the virtual inertia, the damping coefficient and the DC voltage rated value, the first time constant value is inferred, and the specific expression is as follows:

[0084]

[0085] Where, T R represents the first time constant value;

[0086] Determining a proportional relationship between a proportional coefficient of a PI controller and an integral coefficient of the PI controller according to the virtual inertia, the damping coefficient and the first time constant;

[0087] Specifically, after determining the first time constant, it is necessary to determine the proportional relationship between the proportional coefficient of the PI controller and the integral coefficient of the PI controller according to the virtual inertia, the damping coefficient and the first time constant. The specific expression is as follows:

[0088]

[0089] Determining a second time constant value according to the proportional relationship;

[0090] Specifically, after the proportional relationship between the proportional coefficient of the PI controller and the integral coefficient of the PI controller is calculated, the value of the second time constant is determined accordingly. The specific expression of the value of the second time constant is as follows:

[0091]

[0092] Where, T H represents the second time constant value;

[0093] Based on the first time constant, the second time constant and the power-frequency response transfer function of the grid-side converter, a frequency response model of the grid-side converter is obtained by solving;

[0094] Therefore, according to equations (5)-(6), equation (3) is simplified to obtain the frequency response model of the grid-side converter;

[0095] In a preferred embodiment, the frequency response model of the grid-side converter is specifically:

[0096]

[0097] In the formula, H V Indicates virtual inertia; D V represents the damping coefficient; Δω represents the angular velocity deviation; ΔP m Indicates the active power reference value of the virtual synchronous machine; ΔP e Indicates the actual deviation value of the virtual synchronous machine; T R Represents the first time constant value; T H Indicates the second time constant value.

[0098] S4, determining a virtual synchronous machine active power reference value according to the real-time DC voltage deviation value and the frequency response model;

[0099] Specifically, the frequency response of formula (7) is very similar to that of a thermal power unit (including a speed regulator), that is, the control strategy virtualizes a speed regulator on the basis of the basic virtual synchronous control strategy to achieve control of the DC voltage; thus, the active power reference value of the virtual synchronous machine is determined according to the real-time DC voltage deviation value and the frequency response model;

[0100] It can be understood that based on the final value theorem, when t→∞, the real-time DC voltage deviation value approaches 0, that is, ΔV dc →0.

[0101] S5. Calculate the additional power of the machine-side converter of the wind turbine according to the power-DC voltage droop coefficient and the DC voltage deviation value;

[0102] In a preferred embodiment, the calculating of the additional power of the machine-side converter of the wind turbine according to the power-DC voltage droop coefficient and the DC voltage deviation value includes:

[0103] The additional power of the machine-side converter is obtained by solving the following formula:

[0104] P add =-K v ΔV dc ; (9)

[0105] In the formula, K v Indicates power-DC voltage droop coefficient, ΔV dc Indicates the DC voltage deviation value;

[0106] Specifically, the disturbance information, i.e., the real-time DC voltage deviation value, is coupled to the machine-side converter, whereby the additional power of the machine-side converter is determined by equation (8); it should be noted that the real-time DC voltage deviation value is generally realized through communication between the grid-side converter and the machine-side converter.

[0107] S6. Calculate a reference value of the machine-side converter power of the wind turbine according to the power constant of the wind turbine, the speed of the wind turbine and the additional power of the machine-side converter;

[0108] In a preferred embodiment, the calculating the reference value of the machine-side converter power of the wind turbine according to the power constant of the wind turbine, the speed of the wind turbine and the additional power of the machine-side converter comprises:

[0109] According to the power constant of the wind turbine and the speed of the wind turbine, an MPPT power reference value is obtained;

[0110] The MPPT power reference value is integrated with the machine-side converter additional power to calculate and obtain the machine-side converter power reference value of the wind turbine.

[0111] In a preferred embodiment, the power reference value of the computer-side converter is calculated by the following formula:

[0112]

[0113] In the formula, K g Represents the power constant of the fan; ω r Indicates the wind turbine speed; K v Indicates power-DC voltage droop coefficient, ΔV dc Indicates the DC voltage deviation value.

[0114] S7, adjusting the wind turbine according to the active power reference value of the virtual synchronous machine and the power reference value of the machine-side converter;

[0115] Specifically, see Figure 2 , which is a structural diagram corresponding to the frequency support control method of the grid-type wind turbine of the present application. The machine-side converter adopts power-DC voltage droop control and vector control; the grid-side converter adopts direct voltage control and virtual synchronization control; thereby, the grid-side converter adjusts the wind turbine according to the active power reference value of the virtual synchronous machine, and the machine-side converter adjusts the wind turbine according to the power reference value of the machine-side converter.

[0116] See also Figure 3 , Figure 3 The schematic diagram of the test system is shown in Figure 1. The test system consists of a permanent magnet synchronous fan, a synchronous machine, a local load and a lossless line.

[0117] See also Figure 4 , Figure 4 The dynamic response of the wind turbine grid-connected system under the continuous disturbance scenario. Before the disturbance, the wind turbine was in the MPPT state. At t = 15s, the local load suddenly changed from 5p.u. to 5.25pu, resulting in a 0.25pu power shortage in the system; at t = 150s, the local load suddenly changed from 5.25pu to 5.5pu, resulting in an increase of 0.25pu power shortage in the system. As shown in the figure, after the first power disturbance, the two control strategies have similar effects on the improvement of the lowest frequency point; after the second power disturbance, the power-DC voltage droop control has a better effect on the improvement of the frequency, and the system frequency recovers faster. In addition, the system steady-state frequency under the power-DC voltage droop control is higher. This is because when the system is close to the steady state, the wind turbine under the proposed control strategy returns to the MPPT state, and the output active power is higher, while the wind turbine under the traditional power-frequency droop control deviates from the MPPT state and the output active power is lower.

[0118] See also Figure 5 , Figure 5This is the wind turbine speed-active power trajectory diagram under the continuous disturbance scenario. It can be seen from the figure that when the wind turbine speed reaches a steady state, the active power is equal to the mechanical power, so the balance points under different strategies are all located on the mechanical power curve. When using traditional power-frequency droop control, the wind turbine releases a certain amount of rotor kinetic energy after the first disturbance and gradually converges to the balance point. After the second disturbance, the rotor kinetic energy is further released and finally converges to a new balance point. Both balance points deviate from the initial operating point (MPPT point), and shift to the left as the power deficit increases, causing the wind turbine active power to decrease in steady state, and additional control is required to adjust the speed to return the operating point to the MPPT point. When the proposed control strategy is adopted, the wind turbine releases a certain amount of rotor kinetic energy after two disturbances and gradually converges to the MPPT point, without the need for additional control to adjust the speed.

[0119] See also Figure 6 , is a grid-type wind turbine frequency support control device provided by a certain embodiment of the present application, comprising: a data acquisition module, a converter mathematical model construction module, a frequency response model determination module, a virtual synchronous machine active power reference value acquisition module, a machine-side converter additional power calculation module, a machine-side converter power reference value calculation module and an adjustment module;

[0120] The data acquisition module is used to acquire basic parameters of the system and real-time DC voltage deviation value; wherein the basic parameters include virtual inertia, damping coefficient, DC capacitor size, DC voltage rating, power-DC voltage droop coefficient, wind turbine power constant and wind turbine speed;

[0121] The converter mathematical model building module is used to build a grid-type converter mathematical model based on direct voltage control and virtual synchronous machine according to the acquired data;

[0122] The frequency response model determination module is used to determine the frequency response model of the grid-side converter according to the grid-type converter mathematical model;

[0123] The virtual synchronous machine active power reference value acquisition module is used to determine the virtual synchronous machine active power reference value according to the real-time DC voltage deviation value and the frequency response model;

[0124] The machine-side converter additional power calculation module is used to calculate the machine-side converter additional power of the wind turbine according to the power-DC voltage droop coefficient and the DC voltage deviation value;

[0125] The machine-side converter power reference value calculation module is used to calculate the machine-side converter power reference value of the wind turbine according to the power constant of the wind turbine, the speed of the wind turbine and the additional power of the machine-side converter;

[0126] The regulating module is used to regulate the wind turbine according to the active power reference value of the virtual synchronous machine and the power reference value of the machine-side converter.

[0127] See also Figure 7 , a certain embodiment of the present application further provides a terminal device, including:

[0128] one or more processors;

[0129] A memory, coupled to the processor, for storing one or more programs;

[0130] When the one or more programs are executed by the one or more processors, the one or more processors implement the grid-type wind turbine frequency support control method as described above.

[0131] The processor is used to control the overall operation of the terminal device to complete all or part of the steps of the above-mentioned grid-type wind turbine frequency support control method. The memory is used to store various types of data to support the operation of the terminal device, and these data may include, for example, instructions for any application or method used to operate on the terminal device, as well as application-related data. The memory can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (Static Random Access Memory, referred to as SRAM), electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, referred to as EEPROM), erasable programmable read-only memory (Erasable Programmable Read-Only Memory, referred to as EPROM), programmable read-only memory (Programmable Read-Only Memory, referred to as PROM), read-only memory (Read-Only Memory, referred to as ROM), magnetic memory, flash memory, disk or optical disk.

[0132] In an exemplary embodiment, the terminal device can be implemented by one or more application specific integrated circuits (ASIC), digital signal processors (DSP), digital signal processing devices (DSPD), programmable logic devices (PLD), field programmable gate arrays (FPGA), controllers, microcontrollers, microprocessors or other electronic components to execute the grid-type wind turbine frequency support control method as described in any of the above embodiments and achieve the same technical effect as the above method.

[0133] In another exemplary embodiment, a computer-readable storage medium including a computer program is also provided, and when the computer program is executed by a processor, the steps of the frequency support control method for a grid-type wind turbine as described in any of the above embodiments are implemented. For example, the computer-readable storage medium may be the above-mentioned memory including the computer program, and the above-mentioned computer program may be executed by a processor of a terminal device to complete the frequency support control method for a grid-type wind turbine as described in any of the above embodiments, and achieve the technical effect consistent with the above-mentioned method.

[0134] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A frequency support control method for a grid-type fan, characterized in that: include: Obtaining basic parameters of the system and real-time DC voltage deviation values; wherein the basic parameters include virtual inertia, damping coefficient, DC capacitor size, DC voltage rating, power-DC voltage droop coefficient, wind turbine power constant, and wind turbine speed; According to the acquired data, a mathematical model of grid-connected converter based on direct voltage control and virtual synchronous machine is established; Determining a frequency response model of a grid-side converter according to the grid-type converter mathematical model; Determining a virtual synchronous machine active power reference value according to the real-time DC voltage deviation value and the frequency response model; The additional power of the machine-side converter of the wind turbine is calculated according to the power-DC voltage droop coefficient and the DC voltage deviation value; Calculate a reference value of the machine-side converter power of the wind turbine according to the power constant of the wind turbine, the speed of the wind turbine and the additional power of the machine-side converter; The wind turbine is adjusted according to the virtual synchronous machine active power reference value and the machine-side converter power reference value.

2. The frequency support control method of a grid-type wind turbine according to claim 1, characterized in that: The grid-type converter mathematical model includes: Among them, H V Indicates virtual inertia; D V represents the damping coefficient; Δω is the angular velocity deviation; ΔP m Indicates the active power reference value of the virtual synchronous machine; ΔP e Indicates the actual deviation value of the virtual synchronous machine; k p Represents the proportional coefficient of the PI controller; k i Indicates the integral coefficient of the PI controller; C is the DC capacitor size; ΔV dc Indicates the DC voltage deviation value; ΔV dc0 Indicates the DC voltage rating.

3. The frequency support control method of a grid-type wind turbine according to claim 2, characterized in that: Determining the frequency response model of the grid-side converter according to the grid-type converter mathematical model includes: Combining various equations in the mathematical model of the grid-type converter, taking the angular velocity deviation value and the active power reference value of the virtual synchronous machine in the mathematical model of the grid-type converter as variables of the transfer function, and solving to obtain the power-frequency response transfer function of the grid-side converter; Determining a first time constant value according to the DC capacitor, the virtual inertia, the damping coefficient, and the DC voltage rated value; Determining a proportional relationship between a proportional coefficient of a PI controller and an integral coefficient of the PI controller according to the virtual inertia, the damping coefficient and the first time constant; Determining a second time constant value according to the proportional relationship; Based on the first time constant, the second time constant and the power-frequency response transfer function of the grid-side converter, a frequency response model of the grid-side converter is obtained by solving.

4. The frequency support control method of a grid-type wind turbine according to claim 3, characterized in that: The frequency response model of the grid-side converter is specifically: In the formula, H V Indicates virtual inertia; D V represents the damping coefficient; Δω represents the angular velocity deviation; ΔP m Indicates the active power reference value of the virtual synchronous machine; ΔP e Indicates the actual deviation value of the virtual synchronous machine; T R Represents the first time constant value; T H Indicates the second time constant value.

5. The frequency support control method for a grid-type wind turbine according to claim 1, characterized in that: The step of calculating the additional power of the machine-side converter of the wind turbine according to the power-DC voltage droop coefficient and the DC voltage deviation value includes: The additional power of the machine-side converter is obtained by solving the following formula: P add =-K v ΔV dc ; In the formula, K v Indicates power-DC voltage droop coefficient, ΔV dc Indicates the DC voltage deviation value.

6. The frequency support control method of a grid-type wind turbine according to claim 5, characterized in that: The calculating the reference value of the machine-side converter power of the wind turbine according to the power constant of the wind turbine, the speed of the wind turbine and the additional power of the machine-side converter comprises: According to the power constant of the wind turbine and the speed of the wind turbine, an MPPT power reference value is obtained; The MPPT power reference value is integrated with the machine-side converter additional power to calculate and obtain the machine-side converter power reference value of the wind turbine.

7. The frequency support control method of a grid-type wind turbine according to claim 6, characterized in that: The power reference value of the computer-side converter is calculated by the following formula: P ref =k g oh r 3 -K v ΔV dc ; In the formula, K g Represents the power constant of the fan; ω r Indicates the wind turbine speed; K v Indicates power-DC voltage droop coefficient, ΔV dc Indicates the DC voltage deviation value.

8. A grid-type fan frequency support control device, characterized in that: include: Data acquisition module, converter mathematical model construction module, frequency response model determination module, virtual synchronous machine active power reference value acquisition module, machine-side converter additional power calculation module, machine-side converter power reference value calculation module and regulation module; The data acquisition module is used to acquire basic parameters of the system and real-time DC voltage deviation value; wherein the basic parameters include virtual inertia, damping coefficient, DC capacitor size, DC voltage rating, power-DC voltage droop coefficient, wind turbine power constant and wind turbine speed; The converter mathematical model building module is used to build a grid-type converter mathematical model based on direct voltage control and virtual synchronous machine according to the acquired data; The frequency response model determination module is used to determine the frequency response model of the grid-side converter according to the grid-type converter mathematical model; The virtual synchronous machine active power reference value acquisition module is used to determine the virtual synchronous machine active power reference value according to the real-time DC voltage deviation value and the frequency response model; The machine-side converter additional power calculation module is used to calculate the machine-side converter additional power of the wind turbine according to the power-DC voltage droop coefficient and the DC voltage deviation value; The machine-side converter power reference value calculation module is used to calculate the machine-side converter power reference value of the wind turbine according to the power constant of the wind turbine, the speed of the wind turbine and the additional power of the machine-side converter; The regulating module is used to regulate the wind turbine according to the active power reference value of the virtual synchronous machine and the power reference value of the machine-side converter.

9. A device, characterized in that: include: one or more processors; A memory, coupled to the processor, for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the grid-type wind turbine frequency support control method as described in any one of claims 1-7.

10. A medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the grid-type wind turbine frequency support control method as described in any one of claims 1 to 7 is implemented.

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