Power response control method and system for grid-forming doubly-fed wind turbine based on phase control

Abstract

The application provides a network-constructing type doubly-fed fan power response control method and system based on phase control, which comprises the following steps: obtaining a stator active power reference value; when the change of the stator active power reference value exceeds a set value, a fast power response control step is adopted: the deviation of the stator active power reference value and the power of the stator active power measurement value is input into a PI module control to generate an additional item of a phase; the deviation of the stator active power reference value and the power of the stator active power measurement value is also input into a virtual rotor motion module; the additional item of the phase is compensated to the output phase angle of the virtual rotor motion module, and the compensated virtual rotor angle is output; and the network-constructing type doubly-fed fan is controlled to realize power response based on the virtual rotor angle.

Description

Technical Field

[0001] This invention belongs to the field of power response control technology for grid-type doubly-fed wind turbines, and particularly relates to a power response control method and system for grid-type doubly-fed wind turbines based on phase control. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] In recent years, the development of new energy sources has accelerated rapidly. However, the intermittent and fluctuating nature of these sources poses a serious challenge to traditional new energy control methods. How to efficiently connect and utilize renewable energy sources while ensuring the safety and stability of the power grid has become a critical issue that urgently needs to be addressed.

[0004] Current grid-following control technology is a classic control strategy for grid-connected converters (such as photovoltaic inverters and wind power converters). Its core idea is to synchronize the converter's output current with the grid voltage by detecting the amplitude, frequency, and phase of the grid voltage, thereby achieving power injection or absorption. However, because grid-following control requires a synchronous generator to provide a coordinate reference and is difficult to actively respond to grid demands, these two characteristics cannot support grid-following renewable energy sources as the main power source in new power systems. To better adapt to scenarios with a high proportion of power electronic equipment, a series of studies on grid-following control are urgently needed.

[0005] Doubly fed induction generators (DFIGs) are currently the most widely used type of wind turbine, therefore, research on their grid-based control technology has significant engineering practical value. Grid-based control technology for DFIGs is an emerging control strategy that aims to enable the DFIG system to possess voltage source characteristics similar to a synchronous generator, autonomously establishing grid voltage and frequency, and providing inertia and damping support, thereby enhancing the stability of the power system, especially in weak grids or high-proportion renewable energy scenarios.

[0006] However, the grid-based control technology of DFIG faces many problems. One important problem is that it is difficult to integrate with energy storage and lacks a long-term stable energy source, that is, it lacks the ability of internal energy buffering. When facing external grid disturbances and internal wind speed disturbances, the grid-based DFIG has a large virtual inertia, so its active power response speed is slow. Under the influence of this slow active power response characteristic, the wind turbine will face the risk of the actual rotor speed being too low or too high.

[0007] Furthermore, current research largely focuses on the grid-connected stability of grid-connected DFIGs, i.e., responding quickly to grid demands by optimizing control strategies or adjusting control parameters. However, stable operation of grid-connected DFIGs cannot solely focus on grid response. During operation, it is necessary to adjust the master controller's power command promptly in response to wind speed changes to ensure the stability of the actual rotor speed of the turbine and prevent DFIG disconnection due to rotor speed runaway. For grid-connected DFIGs, deviations in active power output from the given value are common due to grid disturbances. Moreover, due to the existence of virtual rotor motion, the response speed after the master controller issues power commands is slow, resulting in poor rotor speed stability of grid-connected DFIGs. Summary of the Invention

[0008] To overcome the shortcomings of the prior art, this invention provides a power response control method for grid-connected doubly fed induction generator (DFIG) wind turbines based on phase control. This method enables the DFIG to maintain its inertial response and primary frequency regulation characteristics during grid disturbances, allowing the wind turbine to balance its own safety and external response requirements, and avoiding frequent grid disconnection caused by actual rotor speed runaway.

[0009] To achieve the above objectives, one or more embodiments of the present invention provide the following technical solutions:

[0010] Firstly, a power response control method for grid-type doubly-fed wind turbines based on phase control is disclosed, including:

[0011] Obtain the reference value of stator active power;

[0012] When the change in the stator active power reference value exceeds the set value, a fast power response control step is adopted: the deviation between the stator active power reference value and the stator active power measurement value is used to generate an additional phase term through the PI module control.

[0013] The deviation between the stator active power reference value and the stator active power measurement value is also input to the virtual rotor motion module; the phase addition is compensated to the output phase angle of the virtual rotor motion module, and the compensated virtual rotor angle is output. Based on the virtual rotor angle, the grid-type doubly fed wind turbine realizes power response.

[0014] As a further technical solution, the deviation between the stator active power reference value and the stator active power measurement value is input to the PI module, and a start-up control step is also included. When the wind speed changes suddenly, fast power control should be started, and after the power stabilizes, the fast power response control branch is locked.

[0015] As a further technical solution, rapid power control should be activated when wind speed changes abruptly, specifically including:

[0016] Define a Pref0 This parameter is the active power command issued by the master controller. P ref A power reference standard established when there are no significant changes over a period of time; active power command P ref Specifically, this refers to the stator active power reference value;

[0017] Activation of fast power response control: when | P ref - P ref0 When the input is less than a certain threshold, fast power response control is blocked, i.e., the input is selected to be 0; when the input is less than a certain threshold, the fast power response control is blocked. P ref - P ref0 If the threshold is exceeded, the input will be selected as... P ref - P s , P s It is the measured value of stator active power.

[0018] As a further technical solution, when the power grid is disturbed, the fast power response control is blocked to maintain the inertial response and primary frequency regulation characteristics, and the power required for inertial response and primary frequency regulation is calculated using the speed change rate.

[0019] As a further technical solution, when there is a requirement for inertial response and primary frequency modulation, P ref The current value is locked, i.e., fast power response control is locked, utilizing rotor kinetic energy to respond to grid demand; when the response ends or the actual rotor speed is too low, inertial response and primary frequency regulation are discontinued, and the locking is no longer applied. P ref , P ref A significant change will occur, triggering fast power response control.

[0020] As a further technical solution, a step of frequency modulation exiting based on exit conditions is also included. The exit conditions are as follows, and only one of the three conditions needs to be met:

[0021] 1. After the active power increases, the rotor speed decreases. When the rotor speed decreases to a threshold, frequency regulation is discontinued and fast power control is initiated.

[0022] 2. Calculate the required inertial response and power for primary frequency regulation using the speed change rate. If this value is less than a threshold, i.e. the speed change rate is very small, exit frequency regulation and start fast power control at the same time.

[0023] 3. If the DFIG is operating in the constant power zone, that is, the rotor speed does not decrease, it will exit after a certain period of time and start fast power control at the same time.

[0024] Secondly, a power response control system for a grid-type doubly-fed wind turbine based on phase control is disclosed, including:

[0025] The stator active power reference value acquisition module is configured to acquire stator active power reference values.

[0026] The phase additional item generation module is configured to: when the change of the stator active power reference value exceeds the set value, adopt the fast power response control step: generate a phase additional item by controlling the power deviation between the stator active power reference value and the stator active power measurement value through the PI module;

[0027] The compensation module is configured to: input the power deviation between the stator active power reference value and the stator active power measurement value into the virtual rotor motion module; compensate the phase addition to the output phase angle of the virtual rotor motion module, output the compensated virtual rotor angle, and construct a grid-type doubly fed wind turbine based on the virtual rotor angle to achieve power response.

[0028] The above one or more technical solutions have the following beneficial effects:

[0029] In the technical solution of this invention, when the change in the stator active power reference value exceeds the set value, a fast power response control step is adopted: the power deviation between the stator active power reference value and the stator active power measurement value is controlled by a PI module to generate an additional phase term, which improves the slow response characteristics of the grid type; the power deviation between the stator active power reference value and the stator active power measurement value is also input to the virtual rotor motion module; the additional phase term is compensated to the output phase angle of the virtual rotor motion module. By optimizing the generation method of the phase angle, the active power deviation is directly reflected in the phase angle, and the phase angle is no longer generated through the virtual rotor motion link. The phase angle corresponds to the power angle and can be directly reflected in the active power.

[0030] When wind speed changes drastically, the technical solution of this invention employs a rapid power response control step to initiate a rapid power response control procedure upon sudden wind speed changes. The wind turbine master controller adjusts the active power command to regulate the actual rotor speed. This rapid power response control strategy can address changes in the master controller's operation. P ref At that time, it enables the active power to respond quickly and track P refThe changes in speed can prevent the actual rotor speed from running out of control. However, the start-up of fast power response control will shield the virtual rotor motion characteristics. By reasonably designing the lockout logic and adopting the fast power response control steps to lock out the grid disturbance, the DFIG can maintain its inertial response and primary frequency regulation characteristics during grid disturbances. This allows the wind turbine to balance its own state safety and external response requirements, avoiding frequent grid disconnection caused by the actual rotor speed running out of control. This approach has strong practicality.

[0031] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0032] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0033] Figure 1 A schematic diagram of the linearized model of VSG;

[0034] Figure 2 The Bode plot corresponding to equation (2) (inertial time constant = 4s);

[0035] Figure 3 The Bode plot corresponding to equation (2) H =1s);

[0036] Figure 4 Fast power response control block diagram based on phase control;

[0037] Figure 5 The Bode plot corresponding to equation (4) H =4s);

[0038] Figure 6 Schematic diagram of signal activation logic during sudden wind speed changes;

[0039] Figure 7 A schematic diagram of the coordinated control logic based on fast power response control;

[0040] Figure 8 Schematic diagram of the simulation system;

[0041] Figure 9 Under a strong power grid, P ref Fluctuating power waveform, (a) P ref Fluctuating at a frequency of 1.5 Hz, (b) P ref Fluctuating at a frequency of 4Hz;

[0042] Figure 10Under weak power grid, P ref Fluctuating power waveform, (a) P ref Fluctuating at a frequency of 1.5 Hz, (b) P ref Fluctuating at a frequency of 4Hz;

[0043] Figure 11 P ref A schematic diagram of the start signal during a transition;

[0044] Figure 12 A schematic diagram of power step response under a strong power grid;

[0045] Figure 13 A schematic diagram of power step response under weak power grid conditions;

[0046] Figure 14 Schematic diagram of power grid frequency disturbance;

[0047] Figure 15 A schematic diagram of the power response of a traditional strategy during grid frequency drops;

[0048] Figure 16 A schematic diagram of the power response of the improved strategy during grid frequency drops;

[0049] Figure 17 A schematic diagram comparing rotor speeds when the grid frequency drops. Detailed Implementation

[0050] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0051] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations of the present invention.

[0052] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0053] Analysis of the motion response characteristics of the virtual rotor: The rotational self-synchronization method of the grid-type DFIG often adopts the control of the virtual synchronous generator (VSG) to model the inertia and damping characteristics of the synchronous generator. The mathematical model of the VSG control after per-unit scaling is shown in Equation (1).

[0054] (1)

[0055] in, J v It is a virtual moment of inertia. ω v It is the virtual rotor speed. ω ref It is the system's rated speed. P ref This is the stator active power reference value. P s This is the measured value of stator active power. D v It is virtual damping. θ This is the virtual rotor angle. Linearizing it yields the linearized model of the VSG, as shown below. Figure 1 As shown.

[0056] in, U sys It is the grid voltage. U s It is the stator terminal voltage. X sys It is the system line impedance. δ 0 is the power angle under steady-state conditions of the system.

[0057] according to Figure 1 It can be deduced ΔP ref to ΔP s The closed-loop transfer function is shown in equation (2).

[0058] (2)

[0059] in

[0060] (3)

[0061] According to equation (2), its transfer function can be plotted as follows: Figure 2 As shown, Figure 2 The system's corresponding inertial time constant H =4s.

[0062] (4)

[0063] In this scenario, under a strong power grid, the cutoff frequency is approximately 4.33Hz, resulting in a relatively high bandwidth, but the amplitude gain is also significant. P ref When changes occur, power fluctuations are quite noticeable. In weak grid scenarios, its cutoff frequency is approximately 0.36Hz, with a very small bandwidth, and the amplitude response of almost all frequency bands is less than 1, indicating a slow power response speed.

[0064] Figure 2 This is a Bode plot when the inertial time constant is 1 s.

[0065] For a synchronous generator, H=1s is an extremely small value. However, due to... Figure 3 It can be seen that when H When reduced to 1 second, under strong power grid conditions, its cutoff frequency is relatively high, and the power amplitude response gain is essentially 1, resulting in a faster power response and significant attenuation of power fluctuations. However, its damping ratio can be calculated to be 0.79, still exhibiting weak damping characteristics. In weak power grid scenarios, its cutoff frequency is approximately 0.33 Hz, compared to... Figure 2 Compared to the Bode plot, there is no significant change, which indicates that its power response speed under weak grid conditions is still relatively slow.

[0066] Therefore, if only by reducing J v To accelerate power response speed, it is difficult to achieve rapid power response and tracking when the wind turbine master control command changes. P ref The demand.

[0067] Due to the existence of the virtual rotor motion equation, the response speed after adjusting the power setpoint is slow, which puts enormous pressure on ensuring the stability of the DFIG rotor speed. This application improves the control strategy so that when the main control unit adjusts the reference value, the active power can quickly track the change of the reference value, thus preventing the actual rotor speed from getting out of control.

[0068] Example 1

[0069] This embodiment discloses a power response control method for a grid-type doubly-fed wind turbine based on phase control, including:

[0070] Obtain the reference value of stator active power;

[0071] When the change in the stator active power reference value exceeds the set value, a fast power response control step is adopted: the deviation between the stator active power reference value and the stator active power measurement value is used to generate an additional phase term through the PI module control.

[0072] The deviation between the stator active power reference value and the stator active power measurement value is also input to the virtual rotor motion module; the phase addition is compensated to the output phase angle of the virtual rotor motion module, and the compensated virtual rotor angle is output. Based on the virtual rotor angle, the grid-type doubly fed wind turbine realizes power response.

[0073] In one implementation example, the specific steps of the power response control method for grid-type doubly-fed wind turbines based on phase control include:

[0074] Step 1: Obtain the stator voltage and stator current of the wind turbine, and calculate the active power of the stator based on the obtained stator voltage and stator current;

[0075] Step 2: Obtain the rated angular velocity of the power grid, P ref The active power of the stator and the stator are based on equations (1) and (5), according to Figure 4 Get the start signal in θ;

[0076] Step 3: Based on the stator voltage, stator voltage reference value, active power reference value, and excitation current reference value of the wind turbine, obtain the dq axis rotor current reference value through the voltage control loop;

[0077] Step 4: Based on the d-axis rotor current reference value, q-axis rotor current reference value, d-axis rotor current, and q-axis rotor current, obtain the excitation voltage in the dq coordinate system through rotor current control;

[0078] Step 5: Based on θ pairs The excitation voltage in the dq coordinate system is inversely transformed to obtain the excitation voltage in the three-phase stationary coordinate system, which is used as the PWM modulation signal for the converter to control the converter.

[0079] In step two, a fast power response control strategy based on phase control is implemented. P ref When significant changes occur, the power deviation is used to generate an additional phase term via PI control to compensate for the phase angle, as shown in the figure, thereby accelerating the power response speed. The control block diagram is as follows. Figure 4 As shown.

[0080] (5)

[0081] in, θ ad This is an additional term for the phase angle. Based on Figure 1 The linearized model can be used to establish a linearized model incorporating a PI loop. Similarly, the power closed-loop transfer function can be obtained as follows:

[0082] (6)

[0083] in, K p and K i These are the proportional and integral coefficients for PI control, respectively.

[0084] Taking the inertial time constant as 4s, a Bode plot can be drawn as follows: Figure 5 As shown.

[0085] Figure 5This indicates that introducing PI-based phase control widens the bandwidth of the closed-loop transfer function. Under strong grid conditions, the amplitude-frequency gain remains greater than 3dB with a very small phase difference, demonstrating that the power can effectively track the given value. Under weak grid conditions, the cutoff frequency is approximately 5.52Hz, indicating that this control strategy effectively accelerates the power response speed and achieves [the desired power output]. P ref Rapid power tracking during changes prevents loss of control over the actual rotor speed.

[0086] Step two also includes: the start-up and latch-up logic steps of fast power response control.

[0087] In order to ensure that the network-type DFIG can balance its own state safety and external demand response, the start-up and latch-up logic of fast power control needs to be designed reasonably.

[0088] 2-1) When there is no disturbance to the power grid and a sudden change in wind speed, fast power response control is activated:

[0089] When wind speed changes abruptly, fast power control should be activated. Once the power stabilizes, the fast power response control branch should be locked out.

[0090] First, define a P ref0 It is the active power command issued by the master controller. P ref A power reference standard determined when it does not change significantly over a period of time.

[0091] Activation of fast power response control: when | P ref - P ref0 When the input is less than a certain threshold, fast power response control is blocked, i.e., the input is selected to be 0; when the input is less than a certain threshold, the fast power response control is blocked. P ref - P ref0 If the threshold is exceeded, the input will be selected as... P ref - P s .

[0092] After activating rapid torque control P ref0 An update is also needed to provide a basis for disabling fast power response control. After activating fast torque control, in... t 0 time ( t 0 can be 1 second after startup), let P ref0 equal t 0 time P ref .existt The specified time after 0 t avg Inside (optional) t avg =2.5s), if | P ref - P ref0 If the threshold is never exceeded, it is considered that the change in the active power command issued by the master controller has ended. At this time, fast power response control is turned off, and its input is reset to 0. t avg Within a time period, if | P ref - P ref0 If the difference between | exceeds the threshold at a certain moment, then let | P ref0 Equal to at that moment P ref And repeat the above steps until one is found. t avg Time period, in t avg Inside | P ref - P ref0 The threshold was never exceeded, thus failing to meet the condition for disabling rapid torque control. The signal activation logic during sudden wind speed changes is as follows: Figure 6 As shown, control is activated only when the wind speed changes abruptly (Pref), and deactivated under other circumstances to maintain inertial response and primary frequency regulation capability.

[0093] 2-2) Steps for blocking fast power response control during grid disturbances: When the grid is undisturbed: Follow the signal initiation logic described in the previous section. After initiating fast power response control, phase angle is no longer generated through virtual rotor motion, and inertia and primary frequency regulation characteristics are lost. Therefore, when grid disturbances occur, this fast power response control should be blocked to maintain inertia response and primary frequency regulation characteristics. Calculate the power required for inertia response and primary frequency regulation using the rate of change of rotational speed.

[0094] (7)

[0095] in, ΔP It is the power required for inertial response and primary frequency modulation, when ΔP If it exceeds a certain threshold, it is considered to be due to the inertial response and the demand for primary frequency modulation, at which point... P ref locking.

[0096] Active power disturbance occurs in the power grid: Assume P sA sudden increase in active power, due to inertia and primary frequency regulation, will continue for a period of time, during which the actual rotor speed will decrease. If the speed is to be controlled back to the value before the disturbance, then... P ref This necessitates changes, and simultaneously, rapid power response control is activated. Activation of this control means that the inertial response and primary frequency modulation characteristics are disrupted.

[0097] To address grid disturbances, a further control logic is implemented: when there is a need for inertial response and primary frequency regulation, the following will be used: P ref Locked to the current value, i.e., locked fast power response control, utilizing rotor kinetic energy to respond to grid demand. When the response ends or the actual rotor speed is too low, inertial response and primary frequency regulation are discontinued, and locking is no longer required. P ref , P ref A significant abrupt change will occur, triggering Fast Power Response Control. The exit conditions are as follows; only one of the three conditions needs to be met:

[0098] 1. After the active power increases, the rotor speed will decrease. When the rotor speed decreases to a threshold (approximately 20%, i.e., the speed decreases from 1.1 pu to 0.9 pu), frequency regulation will be discontinued, and fast power control will be started at the same time.

[0099] 2. Calculate the required inertial response and power for primary frequency regulation using the rotational speed change rate according to equation (6). If this value is less than a threshold, i.e. the rotational speed change rate is very small, exit frequency regulation and start fast power control at the same time.

[0100] 3. If the DFIG is operating in the constant power zone, that is, the rotor speed does not decrease, the overload time of the fan will be too long if the frequency regulation is not discontinued. Therefore, in this case, the fan will be discontinued after a certain period of time, and fast power control will be started at the same time.

[0101] The term "exit" here refers to exiting the inertial response and primary frequency regulation. This is because the system still needs to respond to the grid during grid disturbances, but prolonged operation in this state can lead to uncontrolled rotor speed (as demonstrated by simulation analysis). Therefore, after a certain period of time, the inertial response and primary frequency regulation must be exited, and fast power control must be initiated to restore the rotor speed.

[0102] In summary, to balance its own operational safety with external demand response, the rotor-side converter control of DFIG is as follows: Figure 7 As shown.

[0103] Method Validation: The proposed method is applied to a DFIG grid-connected control system to verify the effectiveness of the proposed strategy. The simulation system is as follows: Figure 8 As shown.

[0104] The control parameters for the virtual rotor motion are shown in Table 1.

[0105] Table 1 Virtual rotor motion control parameters

[0106]

[0107] P ref Fluctuation: Given a DFIG power reference value, the simulation injects oscillations of different frequencies into the Pref and compares the power response waveforms with and without fast power control. Figure 9 Under a strong power grid, P ref The power point tracking (PPT) performance under varying frequency fluctuations was investigated, focusing on whether fast power response control was enabled. Under strong grid conditions, traditional strategies exhibit significant amplitude gain at low frequencies, resulting in poor PPT performance. In contrast, the proposed strategy demonstrates good PPT performance across different frequencies. Figure 10 For weak power grids, P ref The power point tracking (PPT) performance under varying frequency fluctuations was investigated, focusing on whether fast power response control was enabled. In weak grid conditions, traditional strategies exhibited very low amplitude gains across all frequency bands, indicating slow power response. The proposed strategy, however, demonstrated superior PPT performance across different frequencies and significantly accelerated power response even in weak grid environments.

[0108] Power Step Response: Simulation Settings P ref At 1 second, it jumps from 0.4 pu to 0.6 pu, and at 5 seconds, it jumps again from 0.6 pu to 0.87 pu. Figure 11 This is the start signal for fast power control. Figure 12 This is a power step response under strong power grid conditions. Under traditional strategies, due to the presence of virtual rotor motion elements, it takes a long time to reach stability, and the power oscillation amplitude is large; while the proposed strategy greatly accelerates the power response speed, and the power can quickly track and stabilize. Figure 13 This refers to the power step response under weak power grid conditions. Under traditional strategies, due to the slow response characteristics of the virtual rotor motion, P ref During abrupt changes, the power response is very slow. The proposed strategy greatly accelerates the power response, enabling the power to quickly track and stabilize.

[0109] In response to grid demand, fast power control is initiated: the simulation sets the grid frequency to drop to 49.5Hz after 10 seconds and recover to 50Hz after 25 seconds. Figure 14 This refers to the external power grid frequency. Figure 15The power response waveform without additional control is shown. When the grid frequency drops, the active power increases, exceeding the reference value, causing the rotor to decelerate. To bring the rotor speed back to normal, the Pref value decreases. However, due to the slow response characteristics of grid-based control, the active power cannot quickly track changes in the reference value.

[0110] Figure 16 This is the power response waveform using fast power control. It is locked when the grid frequency drops. P ref At this point, the rotor will continue to decelerate. When the rotor speed falls below the threshold, it will exit inertial response and primary frequency regulation. P ref In the event of a sudden change, rapid power control is activated, enabling the active power to quickly track changes in the reference value.

[0111] Figure 17 This section compares the rotor speeds of the traditional strategy and the fast power response control strategy. Under the traditional strategy, when the grid frequency drops, the rotor speed will continue to decrease, leading to rotor speed runaway. However, with fast power control, the rotor speed can be brought back when it falls below a certain threshold (0.9 pu), effectively avoiding actual speed runaway.

[0112] Example 2

[0113] The purpose of this embodiment is to provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the above-described method.

[0114] Example 3

[0115] The purpose of this embodiment is to provide a computer-readable storage medium.

[0116] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, performs the steps of the above-described method.

[0117] Example 4

[0118] The purpose of this embodiment is to provide a power response control system for a grid-type doubly-fed wind turbine based on phase control, including:

[0119] The stator active power reference value acquisition module is configured to acquire stator active power reference values.

[0120] The phase additional item generation module is configured to: when the change of the stator active power reference value exceeds the set value, adopt the fast power response control step: generate a phase additional item by controlling the power deviation between the stator active power reference value and the stator active power measurement value through the PI module;

[0121] The compensation module is configured to: input the power deviation between the stator active power reference value and the stator active power measurement value into the virtual rotor motion module; compensate the phase addition to the output phase angle of the virtual rotor motion module, output the compensated virtual rotor angle, and construct a grid-type doubly fed wind turbine based on the virtual rotor angle to achieve power response.

[0122] Example 5

[0123] The purpose of this embodiment is to provide a computer program product containing instructions that, when run on a computer, cause the computer to perform the methods and functions involved in any of the above embodiments.

[0124] The steps and methods involved in the apparatus of the above embodiments correspond to those in Embodiment 1. For specific implementation details, please refer to the relevant description section of Embodiment 1. The term "computer-readable storage medium" should be understood as a single medium or multiple media including one or more instruction sets; it should also be understood as including any medium capable of storing, encoding, or carrying an instruction set for execution by a processor and enabling the processor to perform any of the methods in this invention.

[0125] Those skilled in the art will understand that the modules or steps of the present invention described above can be implemented using general-purpose computer devices. Optionally, they can be implemented using computer-executable program code, thereby allowing them to be stored in a storage device for execution by a computer device, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. The present invention is not limited to any particular combination of hardware and software.

[0126] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A method for power response control of a grid-forming doubly-fed wind turbine based on phase control, characterized in that, The method comprises: acquiring a stator active power reference value; when the change of the stator active power reference value exceeds a set value, a fast power response control step is adopted: a phase additional term is generated by PI module control on the basis of the deviation of the stator active power reference value from the power of a stator active power measurement value; the deviation of the stator active power reference value from the power of the stator active power measurement value is also input to a virtual rotor motion module; the phase additional term is compensated to the output phase angle of the virtual rotor motion module, and a compensated virtual rotor angle is output, and a power response of a grid-type doubly-fed wind turbine is realized on the basis of the virtual rotor angle; before the deviation of the stator active power reference value from the power of the stator active power measurement value is input to the PI module, a starting control step is further included, wherein the fast power control should be started when the wind speed suddenly changes, and the fast power response control branch should be locked after the power is stable; the fast power control should be started when the wind speed suddenly changes, and specifically comprises: Define a P ref0 The parameter is the active instruction issued by the master P ref A power reference base determined when there is no substantial change in a period of time; active instruction P ref Specifically, the stator active power reference value Start of fast power response control: when P ref - P ref0 | less than a certain threshold, the fast power response control is blocked, i.e. the input is chosen to be 0; when P ref - P ref0 | above the threshold, the input is chosen to be P ref - P s , P s is the stator active power measurement; when the power grid is disturbed, the fast power response control is locked, the inertia response and the primary frequency modulation characteristics are maintained, and the power required for the inertia response and the primary frequency modulation is calculated by using the rotor speed change rate; When there is inertia response and primary frequency regulation demand, the system will P ref Lock the current value, i.e. lock the fast power response control, use the rotor kinetic energy to respond to the grid demand; when the response ends or the actual rotor speed is too low, exit the inertia response and primary frequency regulation, at which time the lock is no longer locked P ref , P ref A large mutation will occur, starting the fast power response control.

2. The phase-control-based network-forming doubly-fed wind generator power response control method according to claim 1, characterized by, a step of exiting the frequency modulation according to an exit condition is further included, and the exit condition is as follows: only one of the three conditions needs to be met: (1) after the active power increases, the rotor speed decreases, and when the rotor speed decreases to a threshold value, the frequency modulation is exited, and the fast power control is started; (2) the power required for the inertia response and the primary frequency modulation is calculated by using the rotor speed change rate, and if the value is less than a threshold value, i.e., the rotor speed change rate is very small, the frequency modulation is exited, and the fast power control is started; (3) if the DFIG operates in a constant power region, i.e., the rotor speed does not decrease, the frequency modulation is exited after a certain time, and the fast power control is started.

3. A phase control based network configuration type doubly-fed wind generator power response control system, characterized in that, The method comprises: a stator active power reference value acquisition module configured to acquire a stator active power reference value; a phase additional term generation module configured to, when the change of the stator active power reference value exceeds a set value, adopt a fast power response control step: a phase additional term is generated by PI module control on the basis of the deviation of the stator active power reference value from the power of a stator active power measurement value; a compensation module configured to: the deviation of the stator active power reference value from the power of the stator active power measurement value is also input to a virtual rotor motion module; the phase additional term is compensated to the output phase angle of the virtual rotor motion module, and a compensated virtual rotor angle is output, and a power response of a grid-type doubly-fed wind turbine is realized on the basis of the virtual rotor angle; before the deviation of the stator active power reference value from the power of the stator active power measurement value is input to the PI module, a starting control step is further included, wherein the fast power control should be started when the wind speed suddenly changes, and the fast power response control branch should be locked after the power is stable; the fast power control should be started when the wind speed suddenly changes, and specifically comprises: Define a P ref0 The parameter is the active instruction issued by the master P ref A power reference base determined when there is no substantial change in a period of time; active instruction P ref Specifically, the stator active power reference value Start of fast power response control: when P ref - P ref0 | less than a certain threshold, the fast power response control is blocked, i.e. the input is chosen to be 0; when P ref - P ref0 | above the threshold, the input is chosen to be P ref - P s , P s is the stator active power measurement; when the power grid is disturbed, the fast power response control is locked, the inertia response and the primary frequency modulation characteristics are maintained, and the power required for the inertia response and the primary frequency modulation is calculated by using the rotor speed change rate; When there is inertia response and primary frequency regulation demand, the P ref Locking to the current value, i.e. locking the fast power response control, using the rotor kinetic energy to respond to the grid demand; when the response ends or the actual rotor speed is too low, exiting the inertia response and primary frequency regulation, at which time it is no longer locked P ref , P ref A large mutation will occur, starting the fast power response control.

4. A computer program product comprising a computer program, characterized in that, the computer program is executed by the processor to realize the method of any one of claims 1 to 2.

5. A computer device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor, when executing the program, implements the steps of the method of any one of claims 1-2.

6. A computer-readable storage medium having stored thereon a computer program, characterized in that, The program, when executed by the processor, performs the steps of the method of any one of claims 1-2.

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