CN-122000932-A - Wind turbine generator frequency modulation control method and device based on power grid frequency disturbance

CN122000932ACN 122000932 ACN122000932 ACN 122000932ACN-122000932-A

Abstract

The invention relates to the technical field of power system control, in particular to a wind turbine generator frequency modulation control method and device based on power grid frequency disturbance. The method comprises the steps of obtaining operation data affecting power grid frequency disturbance, wherein the operation data comprise real-time rotating speed, pitch angle and active power of a wind turbine, actual values of power grid frequency, frequency deviation and frequency change rate, inputting the operation data into a preset mixed model to obtain power grid frequency disturbance events, wherein the power grid frequency disturbance events comprise frequency drop disturbance events, frequency rising disturbance events and no effective disturbance events, determining a frequency modulation control mode of the wind turbine based on the power grid frequency disturbance events, controlling the wind turbine based on the frequency modulation control mode of the wind turbine, and balancing operation safety and frequency dynamic suppression of the wind turbine by the first frequency modulation control mode. Therefore, the frequency dynamic inhibition of the wind turbine can be met on the premise of ensuring the safety of the wind turbine.

Inventors

ZHAO AQIN
YANG CHAO
WANG FENGJUN
YAN LIWEI
ZHANG HONGMIN
LIU ZHIQIANG
SU GUOWEI
WANG BO
SHI ZHIHUA
FAN ZHIHUI
ZHANG PENGFEI

Assignees

华润新能源投资有限公司山西分公司

Dates

Publication Date: 20260508
Application Date: 20260206

Claims (10)

1. A wind turbine generator frequency modulation control method based on power grid frequency disturbance is characterized by comprising the following steps: Acquiring operation data affecting power grid frequency disturbance, wherein the operation data comprises real-time rotating speed, pitch angle, active power of a wind turbine generator, actual value of power grid frequency, frequency deviation and frequency change rate; Inputting the operation data into a preset hybrid model to obtain a power grid frequency disturbance event, wherein the power grid frequency disturbance event comprises a frequency drop disturbance event, a frequency rise disturbance event and an ineffective disturbance event; Determining a frequency modulation control mode of the wind turbine generator based on the grid frequency disturbance event, wherein the frequency modulation control mode comprises a first frequency modulation control mode and a second frequency modulation control mode; Controlling the wind turbine based on the frequency modulation control mode of the wind turbine; The first frequency modulation control mode is used for balancing the safety of operation of the wind turbine and frequency dynamic inhibition.
2. The method of claim 1, wherein determining a frequency modulation control mode of a wind turbine based on the grid frequency disturbance event comprises: When the power grid frequency disturbance event is the rate drop disturbance event or the frequency rise disturbance event, determining that the wind turbine enters the first frequency modulation control mode; When the power grid frequency disturbance event is the effective disturbance event, controlling the wind turbine generator to enter the second frequency modulation control mode, wherein when the wind turbine generator enters the second frequency modulation control mode, Maximum power tracking operation is maintained.
3. The method according to claim 2, characterized in that when the wind turbine enters the first fm control mode, the following is performed: Determining a first virtual inertia control additional power command based on the initial virtual inertia coefficient; The first virtual inertia control additional power instruction is brought into a wind turbine generator simulation model to obtain simulation data, wherein the simulation data comprise simulation full-period frequency change rate, simulation full-period rotor rotating speed and simulation full-period frequency deviation; The simulation data are carried into a first objective function to be optimized, and an optimal virtual inertia coefficient corresponding to the first objective function value when the first objective function value is minimum is obtained; Determining an optimal virtual inertia control additional power instruction based on the optimal virtual inertia coefficient; and controlling the wind turbine based on the optimal virtual inertia control additional power instruction.
4. A method according to claim 3, wherein the first virtual inertial control additional power command is determined by the following formula: in the formula, Additional power commands for the first virtual inertial control, For the initial virtual inertia coefficient in question, For the initial rate of change of the frequency, Is the derivative of the initial frequency rate of change.
5. The method of claim 4, wherein the wind turbine simulation model is constructed by the following equation: in the formula, Is the rotational inertia of a rotor of the wind turbine generator, Is the mechanical torque of the wind turbine generator, Is the electromagnetic torque of the wind turbine generator, Is the damping torque of the wind turbine generator, Is the electromagnetic power of the wind turbine generator, For the simulated full period rotor speed, The power is the basic output power of the unit, For the equivalent inertia of the power grid, For the power difference of the power grid, For the power of the grid load fluctuation, For the simulation of the full period frequency deviation, As the actual value of the time-series frequency, For the rated frequency of the power grid, And simulating the full period frequency change rate for the simulation.
6. The method of claim 5, wherein the first objective function is constructed by the following formula: in the formula, For the first value of the objective function, For the frequency deviation penalty factor, For the duration of operation of the first fm control mode, For the first preset weight coefficient, For the second preset weight coefficient, the first preset weight coefficient, A penalty coefficient is accumulated for the rotational speed fluctuation, Is the rated rotating speed of the machine set, And simulating the full period frequency change rate for the simulation.
7. The method of claim 1, wherein the preset hybrid model comprises a first input layer, a one-dimensional CNN spatial feature extraction layer, a pooling layer, a BiLSTM time sequence feature mining layer, a feature splicing layer and a first full-connection output layer which are sequentially connected, wherein the first input layer is used for receiving the operation data, the one-dimensional CNN spatial feature extraction layer is used for extracting local spatial correlation features of the operation data, the pooling layer is used for performing dimension reduction and redundancy elimination on the local spatial correlation features and reserving key features, the BiLSTM time sequence feature mining layer is used for extracting bidirectional time sequence dependency features of the features subjected to pooling processing, the feature splicing layer is used for receiving the dimension reduced local spatial correlation features and the bidirectional time sequence dependency features and outputting a time-space fusion feature matrix, and the first full-connection output layer is used for receiving the time-space fusion feature matrix and outputting the grid frequency disturbance event.
8. Wind turbine generator system frequency modulation control device based on electric wire netting frequency disturbance, characterized by comprising: The system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is configured to acquire operation data affecting the disturbance of the frequency of a power grid, and the operation data comprise real-time rotating speed, pitch angle, actual value of active power and the frequency of the power grid, frequency deviation and frequency change rate of the wind turbine; The first data processing unit is configured to input the operation data into a preset mixed model to obtain a power grid frequency disturbance event, wherein the power grid frequency disturbance event comprises a frequency drop disturbance event, a frequency rise disturbance event and an ineffective disturbance event; the system comprises a first data processing unit, a second data processing unit and a control unit, wherein the first data processing unit is configured to determine a first frequency modulation control mode of a wind turbine generator based on the power grid frequency disturbance event; The third data processing unit is configured to control the wind turbine based on a frequency modulation control mode of the wind turbine; The first frequency modulation control mode is used for balancing the safety of operation of the wind turbine and frequency dynamic inhibition.
9. An electronic device comprising a memory and a processor, the memory having stored therein a computer program, the processor implementing the method of any of claims 1-7 when the computer program is executed.
10. A computer readable storage medium, having stored thereon a computer program which, when executed in a computer, causes the computer to perform the method of any of claims 1-7.

Description

Wind turbine generator frequency modulation control method and device based on power grid frequency disturbance Technical Field The invention relates to the technical field of power system control, in particular to a wind turbine generator frequency modulation control method and device based on power grid frequency disturbance. Background With the acceleration of global energy transformation, the permeability of wind power as an intermittent power source continuously rises, and a traditional frequency modulation mechanism taking a synchronous generator set as a main part faces a serious challenge. The frequency stability of the power system is a core element for guaranteeing the safe operation of the power grid, and the control precision of the power system is directly related to the electric energy quality and the safety of electric equipment. However, a large number of wind turbines are connected to a power grid through a power electronic converter, and have significant differences with the operation characteristics of the traditional synchronous generator, and the moment of inertia of the wind turbines cannot directly participate in the frequency adjustment of the power grid, so that the inertial response capacity of a power system is weakened, and the problem of frequency stability is more remarkable. The conventional wind turbine generator frequency modulation control technology mainly comprises single strategies such as virtual inertia control, sagging control and the like or simple hybrid control. The virtual inertia control can rapidly respond to frequency change, but has short action time, and cannot realize steady-state adjustment, while the droop control can realize steady-state adjustment, but has slower dynamic response speed, and is difficult to cope with rapid abrupt change of the power grid frequency. Meanwhile, the problem of insufficient adaptability to complex and changeable actual operation conditions commonly exists in the prior art, and active power output of the wind turbine generator is difficult to timely and accurately adjust under extreme conditions such as rapid change of wind speed or serious faults of a power grid, so that the problems of poor frequency modulation effect, secondary frequency drop possibly even caused and the like are solved, and the safety of the wind turbine generator is affected. Based on the frequency modulation control method and device for the wind turbine generator set based on the power grid frequency disturbance are provided by the invention to solve the technical problems. Disclosure of Invention The invention describes a wind turbine generator frequency modulation control method and device based on power grid frequency disturbance, which can meet the requirement of frequency dynamic inhibition of a wind turbine generator on the premise of ensuring the safety of the wind turbine generator. According to a first aspect, the invention provides a wind turbine generator frequency modulation control method based on grid frequency disturbance, which comprises the following steps: Acquiring operation data affecting power grid frequency disturbance, wherein the operation data comprises real-time rotating speed, pitch angle, active power of a wind turbine generator, actual value of power grid frequency, frequency deviation and frequency change rate; inputting the operation data into a preset mixed model to obtain a power grid frequency disturbance event; Determining a frequency modulation control mode of the wind turbine generator based on the grid frequency disturbance event, wherein the frequency modulation control mode comprises a first frequency modulation control mode and a second frequency modulation control mode; Controlling the wind turbine based on the frequency modulation control mode of the wind turbine; The first frequency modulation control mode is used for balancing the safety of operation of the wind turbine and frequency dynamic inhibition. According to a second aspect, the invention provides a wind turbine generator frequency modulation control device based on grid frequency disturbance, comprising: The system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is configured to acquire operation data affecting the disturbance of the frequency of a power grid, and the operation data comprise real-time rotating speed, pitch angle, actual value of active power and the frequency of the power grid, frequency deviation and frequency change rate of the wind turbine; The first data processing unit is configured to input the operation data into a preset hybrid model to obtain a power grid frequency disturbance event; the system comprises a first data processing unit, a second data processing unit and a control unit, wherein the first data processing unit is configured to determine a first frequency modulation control mode of a wind turbine generator based on the power grid frequency disturbance event; The third