Wind power plant control method, device and system based on dynamic feed-forward compensation

Abstract

The invention discloses a wind power plant control method, device and system based on dynamic feed-forward compensation, and belongs to the technical field of wind power generation, the wind power plant control method based on dynamic feed-forward compensation comprises the following steps: when a compensation ring based on dynamic feed-forward compensation is started by a wind power plant, calculating control parameters of an active compensation ring and a reactive compensation ring, then, self-adaptive frequency voltage support for load sudden change is achieved through the control parameters of the compensation ring, and self-adaptive support for fans with different wind speeds is achieved through the wind speed correction factors of all the fan units; and correcting the control parameter of the compensation ring by using the wind speed correction factor to obtain a corresponding active power compensation value and an active power compensation value, thereby performing power compensation. According to the method, self-adaptive frequency and voltage decoupling support can be carried out on load sudden change, and the frequency and voltage stability problem of the doubly-fed fan caused by PLL errors under the weak power grid condition can be effectively improved.

Description

Technical Field

[0001] This invention belongs to the field of wind power generation technology, and more specifically, relates to a wind farm control method, device and system based on dynamic feedforward compensation. Background Technology

[0002] With the rapid development of high-proportion new energy power systems, wind power systems, primarily based on doubly-fed induction generators (DFIGs), have seen rapid growth. Existing onshore wind farms are mainly distributed in wind-rich areas such as the "Three Norths" region (Northeast, North, and Northwest China), often far from load centers. Simultaneously, large-scale wind power typically integrates into the grid after voltage boosting, resulting in high grid impedance and low short-circuit ratios in the connected AC systems. This creates scenarios where wind power is integrated into weak grids, increasing the risk of system frequency and voltage instability. Compared to the synchronization method of synchronous generators, DFIGs often employ dual-loop vector control based on phase-locked loops (PLLs). The PLL feedback obtains the amplitude, frequency, and phase of the grid voltage to achieve synchronization with the grid. However, under weak grid conditions, this control exhibits dynamic errors in tracking the phase, ultimately leading to coupling between active and reactive power. Furthermore, significant differences in wind speed causing varying operating states among turbines result in differences in dynamic errors, and the interactive effects of the wind farm's spatial structure pose complex challenges to the wind farm's ability to support grid frequency and voltage.

[0003] Existing research on power coupling characteristics and decoupling strategies mainly focuses on the converter level. The complexity of wind power generation systems far exceeds that of a single converter, involving multiple coupling factors such as mechanical dynamics, grid interaction, and PLL dynamics. Existing wind turbine decoupling schemes are mostly focused on improving the internal control of the PLL at the single-unit level. Although this can improve stability to a certain extent, it suffers from insufficient power decoupling, which leads to poor frequency and voltage stability. Summary of the Invention

[0004] In view of the above-mentioned defects or improvement needs of the existing technology, the present invention provides a wind farm control method, device and system based on dynamic feedforward compensation. Its purpose is to solve the technical problem of insufficient power decoupling in existing wind farms, which leads to poor frequency and voltage stability.

[0005] To achieve the above objectives, according to one aspect of the present invention, a wind farm control method based on dynamic feedforward compensation is provided, comprising: When the wind farm starts its active power compensation loop based on dynamic feedforward compensation, it utilizes... Calculate the control parameters of the active power compensation loop The control parameters of the active power compensation loop This includes: the relationship coefficient between the reactive power and voltage phase angle of each wind turbine unit. The relationship coefficient between the reactive power and voltage amplitude of each wind turbine unit The control parameters of the active power compensation loop are corrected by using the wind speed correction factor of each wind turbine to obtain the corresponding active power compensation value, thereby performing power compensation. For the moment of failure initial value, The droop coefficient is... The rate of change of frequency; When the wind farm starts the reactive power compensation loop based on dynamic feedforward compensation, it utilizes... Calculate the control parameters of the reactive power compensation loop The control parameters of the reactive power compensation loop This includes: the relationship coefficient between the active power and voltage phase angle of each wind turbine unit. The relationship coefficient between the active power and voltage amplitude of each wind turbine unit The control parameters of the reactive power compensation loop are corrected by using the wind speed correction factor of each wind turbine to obtain the corresponding reactive power compensation value, thereby performing power compensation. For the moment of failure initial value, This represents the rate of change of voltage.

[0006] Furthermore, the step of using the wind speed correction factor of each wind turbine to correct the control parameters of the active power compensation loop to obtain the corresponding active power compensation value includes: using... Calculate the active power compensation of the k-th wind turbine. ;in, For real-time changing active power, For real-time changing reactive power, The coefficient representing the relationship between the reactive power and voltage phase angle of the k-th wind turbine and the j-th wind turbine is given. Let be the coefficient relating reactive power and voltage amplitude between the k-th and j-th wind turbine units. Let be the reactive power output of the j-th wind turbine, and n be the total number of wind turbines.

[0007] Furthermore, the step of using the wind speed correction factor of each wind turbine to correct the control parameters of the active power compensation loop to obtain the corresponding active power compensation value includes: using... Calculate the active power compensation value of the k-th wind turbine. ;in, For real-time changing active power, For real-time changing reactive power, is the wind speed correction factor for the k-th wind turbine unit; The variable reactive power output of the k-th wind turbine unit.

[0008] Furthermore, the step of using the wind speed correction factor of each wind turbine to correct the control parameters of the reactive power compensation loop to obtain the corresponding reactive power compensation value includes: using... Calculate the reactive power compensation value of the k-th wind turbine. ;in, For real-time changing active power, For real-time changing reactive power, The coefficient representing the relationship between the active power and voltage phase angle of the k-th wind turbine and the j-th wind turbine is given. This represents the coefficient relating the active power and voltage amplitude of the k-th wind turbine and the j-th wind turbine. Let be the active power output of the j-th wind turbine, and n be the total number of wind turbines.

[0009] Furthermore, the step of using the wind speed correction factor of each wind turbine to correct the control parameters of the reactive power compensation loop to obtain the corresponding reactive power compensation value includes: using... Calculate the reactive power compensation value of the k-th wind turbine. ;in, For real-time changing active power, For real-time changing reactive power, is the wind speed correction factor for the k-th wind turbine unit; The variable reactive power output of the k-th wind turbine unit.

[0010] Furthermore, the wind speed correction factor for the k-th wind turbine is expressed as: ; and These are two control parameters of the PI controller, where s is the Laplace factor. , ...

[0011] Furthermore, after closing all currently initiated compensation loops, the expression is used... Evaluate the power decoupling effect after starting the compensation loop; among which... When the k-th wind turbine experiences a single-unit disturbance, the coupling degree of the i-th wind turbine in the wind farm is: ; The step disturbance occurs in the active power reference value of the k-th wind turbine, and T1 is the time window of the first oscillation period. The maximum reactive power within the T1 time window. This represents the maximum reactive power value within the T1 time window. When a constant power step disturbance occurs at the wind farm's grid connection point... At that time, the coupling degree of the entire wind farm is: , where n is the total number of wind turbine units.

[0012] According to another aspect of the present invention, a wind farm control device based on dynamic feedforward compensation is provided, comprising: The active power compensation module is used when the wind farm starts the active power compensation loop based on dynamic feedforward compensation, utilizing... Calculate the control parameters of the active power compensation loop The control parameters of the active power compensation loop This includes: the relationship coefficient between the reactive power and voltage phase angle of each wind turbine unit. The relationship coefficient between the reactive power and voltage amplitude of each wind turbine unit The control parameters of the active power compensation loop are corrected by using the wind speed correction factor of each wind turbine to obtain the corresponding active power compensation value, thereby performing power compensation. For the moment of failure initial value, The droop coefficient is... The rate of change of frequency; The reactive power compensation module is used when the wind farm starts a reactive power compensation loop based on dynamic feedforward compensation. Calculate the control parameters of the reactive power compensation loop The control parameters of the reactive power compensation loop This includes: the relationship coefficient between the active power and voltage phase angle of each wind turbine unit. The relationship coefficient between the active power and voltage amplitude of each wind turbine unit The control parameters of the reactive power compensation loop are corrected by using the wind speed correction factor of each wind turbine to obtain the corresponding reactive power compensation value, thereby performing power compensation. For the moment of failure initial value, This represents the rate of change of voltage.

[0013] According to another aspect of the present invention, a wind farm control system based on dynamic feedforward compensation is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of a wind farm control method based on dynamic feedforward compensation.

[0014] According to another aspect of the present invention, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the steps of a wind farm control method based on dynamic feedforward compensation.

[0015] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects: (1) This invention provides a wind farm control method based on dynamic feedforward compensation. When the wind farm starts a compensation loop based on dynamic feedforward compensation, it utilizes... and The control parameters are calculated, and then the control parameters of the compensation loop are used to achieve adaptive frequency voltage support for load changes. The wind speed correction factors for each wind turbine unit are used to achieve adaptive support for wind turbines at different wind speeds. The control parameters of the compensation loop are then corrected using the wind speed correction factors to obtain the corresponding active power compensation value. and active power compensation value This invention enables power compensation. It provides adaptive frequency and voltage decoupling support for load fluctuations, effectively improving the frequency and voltage stability issues of doubly-fed induction generator (DFIG) wind turbines under weak grid conditions caused by PLL errors.

[0016] (2) The active power coupling value in this scheme is expressed as: Considering the active power coupling of the kth wind turbine caused by the reactive power variation of each wind turbine in the wind farm, frequency-voltage decoupling support under active power deficit conditions can be achieved by feeding forward compensation to the active power outer loop of the rotor-side converter of the kth wind turbine.

[0017] (3) The active power coupling value in this scheme is expressed as: Considering that the reactive power of each wind turbine in a wind farm is difficult to obtain in real time, and that there is a quadratic or higher relationship between wind speed and turbine coupling, a wind speed correction factor can be used. This is used to measure the coupling of other wind turbines relative to the k-th wind turbine. Since the rotational speed does not change in a short period of time at the moment of failure, the wind speed distribution information of the first wind farm to be compensated after the failure is relatively easy to obtain, which can simplify analysis and control.

[0018] (4) The reactive power coupling value in this scheme is expressed as: Considering the reactive power coupling of the kth wind turbine caused by the change in active power of each wind turbine in the wind farm, frequency-voltage decoupling support under reactive power deficit can be achieved by feeding forward compensation to the reactive power outer loop of the rotor-side converter of the kth wind turbine.

[0019] (5) The reactive power coupling value in this scheme is expressed as: Considering that the reactive power of each wind turbine in a wind farm is difficult to obtain in real time, and that there is a quadratic or higher relationship between wind speed and turbine coupling, a wind speed correction factor can be used to measure the coupling of other turbines relative to the k-th turbine. Furthermore, since the rotational speed does not change significantly during a fault, the wind speed distribution information of the first wind farm to be compensated after the fault is relatively easy to obtain, simplifying analysis and control.

[0020] (6) For fans with different wind speeds, the parameters in this scheme are adjusted according to the wind speed correction factor. By scaling adjustments, two-layer adaptive parameter changes can be achieved for different accident levels and different wind speed distributions.

[0021] (7) Based on the proposed formulas for coupling rate and decoupling rate, this scheme measures the power coupling situation and the effectiveness of the decoupling strategy under different short-circuit ratios and phase-locked loop bandwidths. The influence of different wind speed distributions and wind farm spatial structures on power coupling is further explored. Attached Figure Description

[0022] Figure 1 A flowchart of the wind farm control method based on dynamic feedforward compensation provided in Embodiment 1 of the present invention; Figure 2 A flowchart illustrating an application scenario of the wind farm control method based on dynamic feedforward compensation provided in Embodiment 1 of the present invention; Figure 3 This is an overall control block diagram of the wind farm control method based on dynamic feedforward compensation provided in Embodiment 1 of the present invention; Figure 4 This is a diagram showing the power coupling voltage-current vector relationship of n wind turbines under a weak power grid, as provided in Embodiment 1 of the present invention. Figure 5 This is a diagram showing the power coupling and decoupling situation before and after compensation in different SCR systems provided in Embodiment 1 of the present invention; Figure 6 Box-type diagram of the coupling situation of the internal lines of the wind farm under different X / R ratios and multiple wind turbines provided in Embodiment 1 of the present invention; Figure 7 This is a schematic diagram showing the changes in fan frequency and grid connection voltage under changes in system active / reactive load, before decoupling, after fixed parameter decoupling, and after double-layer adaptive decoupling, as provided in Embodiment 1 of the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0024] Example 1 This embodiment provides a wind farm control method based on dynamic feedforward compensation, including: power compensation methods in two scenarios, such as... Figure 1 As shown.

[0025] For example, such as Figure 2 and Figure 3As shown, under weak grid conditions, in a scenario where the wind farm employs voltage-oriented vector control based on a phase-locked loop (PLL), real-time data is collected on grid frequency, grid connection point voltage, and wind speed. The grid frequency information includes the grid frequency deviation and grid frequency change rate per unit time. The grid connection point voltage information includes the grid connection point voltage deviation and grid connection point voltage change rate per unit time. The wind speed information includes the wind speed within the first unit time after an accident occurs at each wind turbine. When both the grid frequency deviation and the grid frequency change rate per unit time exceed their respective first preset thresholds, a dynamic feedforward-based active power compensation loop is activated. When both the grid connection point voltage deviation and the grid connection point voltage change rate per unit time exceed their respective second preset thresholds, but neither exceeds their respective first preset thresholds, a dynamic feedforward-based reactive power compensation loop is activated. Both the active power compensation loop and the reactive power compensation loop adaptively adjust based on two levels: the severity of the grid load accident and the wind speed of the wind turbines. When the grid frequency reaches its lowest / highest point and the corresponding grid frequency change rate is equal to 0, all currently activated compensation loops are shut down.

[0026] When the wind farm starts its active power compensation loop based on dynamic feedforward compensation, it utilizes... Calculate the control parameters of the active power compensation loop The control parameters of the active power compensation loop This includes: the relationship coefficient between the reactive power and voltage phase angle of each wind turbine unit. The relationship coefficient between the reactive power and voltage amplitude of each wind turbine unit The control parameters of the active power compensation loop are corrected by using the wind speed correction factor of each wind turbine to obtain the corresponding active power compensation value, thereby performing power compensation. For the moment of failure initial value, The droop coefficient is... The rate of change of frequency; When the wind farm starts the reactive power compensation loop based on dynamic feedforward compensation, it utilizes... Calculate the control parameters of the reactive power compensation loop The control parameters of the reactive power compensation loop This includes: the relationship coefficient between the active power and voltage phase angle of each wind turbine unit. The relationship coefficient between the active power and voltage amplitude of each wind turbine unit The control parameters of the reactive power compensation loop are corrected by using the wind speed correction factor of each wind turbine to obtain the corresponding reactive power compensation value, thereby performing power compensation. For the moment of failure initial value, This represents the rate of change of voltage.

[0027] Among them, the parameters in the dynamic feedforward active power compensation loop To ensure that the parameters can smoothly decrease to zero and to further optimize decoupling support, a parameter is constructed. Based on the regular changes of the modified Logistic function: This represents all parameters in the active power compensation loop PI controller, including , , , , For the moment of failure initial value, , For the aftermath of the accident Internal frequency deviation, This is the maximum frequency shift caused by the most severe load active power surge; ...usually, the corresponding value is taken as... One-third to one-half of the value, to ensure Within a suitable range of values .

[0028] Among them, the parameters in the dynamic feedforward reactive power compensation loop To ensure that the parameters can smoothly decrease to zero and to further optimize decoupling support, a parameter is constructed. Based on the regular changes of the modified Logistic function: This represents all parameters in the active power compensation loop PI controller, including , , , , For the moment of failure initial value, , After the accident Internal voltage deviation, This is the maximum voltage deviation caused by the most severe load reactive power surge, as preset. Usually, the corresponding value is taken. Values ​​of 1 / 3 to 1 / 2, to ensure Within a suitable range of values .

[0029] Figure 4 This is a diagram showing the power coupling voltage-current vector relationship of n wind turbines under a weak power grid. (The diagram is constructed by analyzing...) Figure 3 The voltage-current vector relationship is analyzed, and the active and reactive power decoupling is not complete under weak grid conditions. The active and reactive power coupling is analyzed and quantified.

[0030] ; ; ; in For real-time changing active power, Real-time changing reactive power in a complex power grid, assuming there are n PQ buses and m PV buses, where... , , , It can be calculated by inverting the Jacobian matrix. , , , This represents the voltage phase angle difference or amplitude difference at the k-th wind turbine node as the active and reactive power of each node changes.

[0031] ; It can quickly detect the accelerated frequency drop caused by the decrease in power grid inertia; For each The frequency deviation is used to avoid false triggering caused by short-term noise or small disturbances. It can be used to monitor a relatively rapid voltage drop in the early stages of a fault, in order to... Consistent time scale, as defined in this paper Sampling step size It is not a timescale of electromagnetic transients; For each The voltage deviation can be used to distinguish between transient voltage fluctuations and more sustained voltage exceedances. When its frequency parameter exceeds a preset threshold, the active power compensation loop is activated. When the voltage parameter exceeds a preset threshold, the reactive power compensation loop is activated.

[0032] Because the wind turbine supports the frequency and voltage, the frequency will recover to a steady state from its lowest / highest point. During this process, the wind turbine is in a state of active power generation increase, and its output is usually automatically adjusted according to a preset droop control. During this process, the dynamic error introduced by the phase-locked loop (PLL) is relatively reduced. If control is continuously applied, the complex feedforward process will reduce the wind turbine's response speed to the reference value, and the benefits of the decoupling loop will also decrease. Therefore, when the lowest / highest frequency point is reached... When the value is 0, the decoupling loop exits control. Record the exit time. .

[0033] Furthermore, the step of using the wind speed correction factor of each wind turbine to correct the control parameters of the active power compensation loop to obtain the corresponding active power compensation value includes: using... Calculate the active power compensation of the k-th wind turbine. ;in, For real-time changing active power, For real-time changing reactive power, The coefficient representing the relationship between the reactive power and voltage phase angle of the k-th wind turbine and the j-th wind turbine is given. Let be the coefficient relating reactive power and voltage amplitude between the k-th and j-th wind turbine units. Let be the reactive power output of the j-th wind turbine, and n be the total number of wind turbines.

[0034] Furthermore, the step of using the wind speed correction factor of each wind turbine to correct the control parameters of the active power compensation loop to obtain the corresponding active power compensation value includes: using... Calculate the active power compensation value of the k-th wind turbine. ;in, For real-time changing active power, For real-time changing reactive power, The coefficient representing the relationship between the reactive power and voltage phase angle of the k-th wind turbine unit is... Let be the reactive power output of the k-th wind turbine. is the coefficient relating the reactive power of the k-th wind turbine to the voltage amplitude. is the wind speed correction factor for the k-th wind turbine.

[0035] Furthermore, the step of using the wind speed correction factor of each wind turbine to correct the control parameters of the reactive power compensation loop to obtain the corresponding reactive power compensation value includes: using... Calculate the reactive power compensation value of the k-th wind turbine. ; in, For real-time changing active power, For real-time changing reactive power, The coefficient representing the relationship between the active power and voltage phase angle of the k-th wind turbine and the j-th wind turbine is given. This represents the coefficient relating the active power and voltage amplitude of the k-th wind turbine and the j-th wind turbine. Let be the active power output of the j-th wind turbine, and n be the total number of wind turbines.

[0036] Furthermore, the step of using the wind speed correction factor of each wind turbine to correct the control parameters of the reactive power compensation loop to obtain the corresponding reactive power compensation value includes:

[0037] in, For real-time changing active power, For real-time changing reactive power, This is the coefficient relating the active power of the k-th wind turbine to the voltage phase angle. Let be the active power output of the k-th wind turbine; is the coefficient relating the active power of the k-th wind turbine to the voltage amplitude. is the wind speed correction factor for the k-th wind turbine.

[0038] Furthermore, the wind speed correction factor for the k-th wind turbine is expressed as: ; and These are two control parameters of the PI controller, where s is the Laplace factor. , ...

[0039] Furthermore, after closing all currently initiated compensation loops, the expression is used... Evaluate the power decoupling effect after starting the compensation loop; among which... When the k-th wind turbine experiences a single-unit disturbance, the coupling degree of the i-th wind turbine in the wind farm is: ; The step disturbance occurs in the active power reference value of the k-th wind turbine, and T1 is the time window of the first oscillation period. The maximum reactive power within the T1 time window. This represents the maximum reactive power value within the T1 time window. When a constant power step disturbance occurs at the wind farm's grid connection point... At that time, the coupling degree of the entire wind farm is: , where n is the total number of wind turbine units.

[0040] Figure 5 The diagrams provided in this embodiment of the invention illustrate power coupling and decoupling before and after compensation under different SCR systems. By changing the short-circuit ratio of the power system, the power coupling of systems with different strengths and the decoupling rate before and after decoupling are tested. It can be seen that the applicable short-circuit ratio SCR range for the feedforward power decoupling loop is 1.5~3, suitable for weak grid systems with high renewable energy penetration. Figure 6 This embodiment provides a box-type diagram showing the coupling situation of different X / R ratios of internal lines in a wind farm and under multiple wind turbines; Figure 7 This is a schematic diagram showing the changes in fan frequency and grid connection voltage under changes in system active / reactive load, before decoupling, after fixed parameter decoupling, and after double-layer adaptive decoupling, as provided in this embodiment.

[0041] Example 2 This embodiment provides a wind farm control device based on dynamic feedforward compensation, including: The active power compensation module is used when the wind farm starts the active power compensation loop based on dynamic feedforward compensation, utilizing... Calculate the control parameters of the active power compensation loop The control parameters of the active power compensation loop This includes: the relationship coefficient between the reactive power and voltage phase angle of each wind turbine unit. The relationship coefficient between the reactive power and voltage amplitude of each wind turbine unit The control parameters of the active power compensation loop are corrected by using the wind speed correction factor of each wind turbine to obtain the corresponding active power compensation value, thereby performing power compensation. For the moment of failure initial value, The droop coefficient is... The rate of change of frequency; The reactive power compensation module is used when the wind farm starts a reactive power compensation loop based on dynamic feedforward compensation. Calculate the control parameters of the reactive power compensation loop The control parameters of the reactive power compensation loop This includes: the relationship coefficient between the active power and voltage phase angle of each wind turbine unit. The relationship coefficient between the active power and voltage amplitude of each wind turbine unit The control parameters of the reactive power compensation loop are corrected by using the wind speed correction factor of each wind turbine to obtain the corresponding reactive power compensation value, thereby performing power compensation. For the moment of failure initial value, This represents the rate of change of voltage.

[0042] Example 3 This embodiment provides a wind farm control system based on dynamic feedforward compensation, including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the steps of the wind farm control method based on dynamic feedforward compensation.

[0043] The wind farm control system can be a computing device such as a desktop computer, laptop, handheld computer, or cloud server. The processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. The memory can be used to store computer programs and / or modules. The processor implements various functions of the wind farm control system by running or executing the computer programs and / or modules stored in the memory, and by calling data stored in the memory.

[0044] Example 4 This embodiment provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of a wind farm control method based on dynamic feedforward compensation.

[0045] Specifically, the memory may include high-speed random access memory, as well as non-volatile memory, such as hard disks, RAM, plug-in hard disks, smart media cards (SMC), secure digital (SD) cards, flash cards, at least one disk storage device, flash memory device, or other volatile solid-state storage devices.

[0046] Example 5 This invention provides a computer program product or computer program that includes computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the steps of the method described in the above embodiments of this invention.

[0047] The technical features of the embodiments described above can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. It should be noted that the terms "in one embodiment," "for example," and "again" in this invention are intended to illustrate the invention and are not intended to limit the invention.

[0048] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A wind farm control method based on dynamic feedforward compensation, characterized in that, include: When the wind farm starts its active power compensation loop based on dynamic feedforward compensation, it utilizes... Calculate the control parameters of the active power compensation loop The control parameters of the active power compensation loop This includes: the relationship coefficient between the reactive power and voltage phase angle of each wind turbine unit. The relationship coefficient between the reactive power and voltage amplitude of each wind turbine unit The control parameters of the active power compensation loop are corrected by using the wind speed correction factor of each wind turbine to obtain the corresponding active power compensation value, thereby performing power compensation. For the moment of failure initial value, The droop coefficient is... The rate of change of frequency; When the wind farm starts the reactive power compensation loop based on dynamic feedforward compensation, it utilizes... Calculate the control parameters of the reactive power compensation loop The control parameters of the reactive power compensation loop This includes: the relationship coefficient between the active power and voltage phase angle of each wind turbine unit. The relationship coefficient between the active power and voltage amplitude of each wind turbine unit The control parameters of the reactive power compensation loop are corrected by using the wind speed correction factor of each wind turbine to obtain the corresponding reactive power compensation value, thereby performing power compensation. For the moment of failure initial value, This represents the rate of change of voltage.

2. The wind farm control method based on dynamic feedforward compensation as described in claim 1, characterized in that, The step of using the wind speed correction factor of each wind turbine to correct the control parameters of the active power compensation loop to obtain the corresponding active power compensation value includes: using Calculate the active power compensation of the k-th wind turbine. ;in, For real-time changing active power, For real-time changing reactive power, The coefficient representing the relationship between the reactive power and voltage phase angle of the k-th wind turbine and the j-th wind turbine is given. Let be the coefficient relating reactive power and voltage amplitude between the k-th and j-th wind turbine units. Let be the reactive power output of the j-th wind turbine, and n be the total number of wind turbines.

3. The wind farm control method based on dynamic feedforward compensation as described in claim 1, characterized in that, The step of using the wind speed correction factor of each wind turbine to correct the control parameters of the active power compensation loop to obtain the corresponding active power compensation value includes: using Calculate the active power compensation value of the k-th wind turbine. ;in, For real-time changing active power, For real-time changing reactive power, is the wind speed correction factor for the k-th wind turbine unit; The variable reactive power output of the k-th wind turbine unit.

4. The wind farm control method based on dynamic feedforward compensation as described in claim 1, characterized in that, The step of using the wind speed correction factor of each wind turbine to correct the control parameters of the reactive power compensation loop to obtain the corresponding reactive power compensation value includes: using Calculate the reactive power compensation value of the k-th wind turbine. ;in, For real-time changing active power, For real-time changing reactive power, The coefficient representing the relationship between the active power and voltage phase angle of the k-th wind turbine and the j-th wind turbine is given. This represents the coefficient relating the active power and voltage amplitude of the k-th wind turbine and the j-th wind turbine. Let be the active power output of the j-th wind turbine, and n be the total number of wind turbines.

5. The wind farm control method based on dynamic feedforward compensation as described in claim 1, characterized in that, The step of using the wind speed correction factor of each wind turbine to correct the control parameters of the reactive power compensation loop to obtain the corresponding reactive power compensation value includes: using Calculate the reactive power compensation value of the k-th wind turbine. ;in, For real-time changing active power, For real-time changing reactive power, is the wind speed correction factor for the k-th wind turbine unit; The variable reactive power output of the k-th wind turbine unit.

6. The wind farm control method based on dynamic feedforward compensation as described in claim 3 or 5, characterized in that, The wind speed correction factor for the kth wind turbine is expressed as: ; and These are two control parameters of the PI controller, where s is the Laplace factor. , ...

7. The wind farm control method based on dynamic feedforward compensation as described in any one of claims 1-6, characterized in that, After closing all currently running compensation loops, using the expression Evaluate the power decoupling effect after starting the compensation loop; among which... When the k-th wind turbine experiences a single-unit disturbance, the coupling degree of the i-th wind turbine in the wind farm is: ; The step disturbance occurs in the active power reference value of the k-th wind turbine, and T1 is the time window of the first oscillation period. The maximum reactive power within the T1 time window. This represents the maximum reactive power value within the T1 time window; When a constant power step disturbance occurs at the wind farm's grid connection point... At that time, the coupling degree of the entire wind farm is: , where n is the total number of wind turbine units.

8. A wind farm control device based on dynamic feedforward compensation, characterized in that, include: The active power compensation module is used when the wind farm starts the active power compensation loop based on dynamic feedforward compensation, utilizing... Calculate the control parameters of the active power compensation loop The control parameters of the active power compensation loop This includes: the relationship coefficient between the reactive power and voltage phase angle of each wind turbine unit. The relationship coefficient between the reactive power and voltage amplitude of each wind turbine unit The control parameters of the active power compensation loop are corrected by using the wind speed correction factor of each wind turbine to obtain the corresponding active power compensation value, thereby performing power compensation. For the moment of failure initial value, The droop coefficient is... The rate of change of frequency; The reactive power compensation module is used when the wind farm starts a reactive power compensation loop based on dynamic feedforward compensation. Calculate the control parameters of the reactive power compensation loop The control parameters of the reactive power compensation loop This includes: the relationship coefficient between the active power and voltage phase angle of each wind turbine unit. The relationship coefficient between the active power and voltage amplitude of each wind turbine unit The control parameters of the reactive power compensation loop are corrected by using the wind speed correction factor of each wind turbine to obtain the corresponding reactive power compensation value, thereby performing power compensation. For the moment of failure initial value, This represents the rate of change of voltage.

9. A wind farm control system based on dynamic feedforward compensation, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 7.

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