Active power adjusting method and device of doubly-fed fan, terminal equipment and storage medium

Abstract

The invention discloses an active power adjusting method and device of a doubly-fed fan, terminal equipment and a storage medium, and belongs to the field of wind power generation, and the method comprises the steps: firstly obtaining a rotor current rotation vector, a three-phase terminal voltage and a mutual inductance reactance value of the doubly-fed fan; then determining an internal potential amplitude of the doubly-fed fan according to the rotor current rotation vector and the mutual inductance reactance value, and then determining a regulation and control quantity through a proportional regulator, the internal potential amplitude and an actually measured internal potential amplitude of the doubly-fed fan; the method comprises the steps of obtaining three-phase terminal voltage, determining a phase-locking frequency error according to the three-phase terminal voltage and the regulation and control quantity, determining a phase-locking phase based on the phase-locking frequency error and a preset rated frequency, and finally, regulating and controlling the active power of the doubly-fed fan according to the phase-locking phase. By implementing the method and the device, the problem that effective power support cannot be provided for the system when the system is interfered due to the fact that the self-adjusting capability of the double-fed fan is limited in the prior art can be solved.

Description

Technical Field

[0001] The present invention relates to the field of wind power generation, and particularly to a method, device, terminal device and storage medium for regulating the active power of a doubly-fed fan. Background Art

[0002] In the prior art, grid-following control based on a phase-locked loop to achieve synchronization function is the mainstream control method for current wind and photovoltaic power generation. Given that the phase-locked loop (PLL) has an extremely high dynamic response speed and can achieve synchronization by tracking the frequency of the terminal voltage, therefore, when the system encounters disturbances, the output phase of the phase-locked loop will quickly follow the change of the terminal voltage phase, making the voltage and current vectors of the power generation equipment relatively stationary with respect to the voltages of other nodes in the system, and the power angle differences of each node remain unchanged.

[0003] In the power system, the flexible regulation of active power is crucial for maintaining the frequency stability and power balance of the system. The fact that the power angle differences of each node remain unchanged means that the active power output by the power generation equipment before and after the disturbance hardly changes. That is to say, when the power system encounters disturbances and additional power support is required to restore the stable operation state, the grid-following power generation equipment, due to the limitation of its own regulation ability, cannot provide effective power support, thereby significantly limiting its support ability for the entire power system. Summary of the Invention

[0004] The present invention provides a method, device, terminal device and storage medium for regulating the active power of a doubly-fed fan. The method can solve the problem in the prior art that due to the limited regulation ability of the doubly-fed fan itself, it cannot provide effective power support for the system when the system is disturbed.

[0005] An embodiment of the present invention provides a method for regulating the active power of a doubly-fed fan, including:

[0006] Obtain the rotor current rotating vector, three-phase terminal voltage and mutual inductance reactance value of the doubly-fed fan;

[0007] Determine the amplitude of the internal electromotive force of the doubly-fed fan according to the rotor current rotating vector and the mutual inductance reactance value;

[0008] Determine a regulation quantity according to a preset proportional regulator, the amplitude of the internal electromotive force and the measured amplitude of the internal electromotive force of the doubly-fed fan;

[0009] Determine the phase-locked frequency error according to the three-phase terminal voltage and the regulation quantity;

[0010] Determine the phase-locked phase based on the phase-locked frequency error and a preset rated frequency;

[0011] Regulate the active power of the doubly-fed fan according to the phase-locked phase.

[0012] Further, determining the amplitude of the internal electromotive force of the doubly-fed fan according to the rotational vector of the rotor current and the mutual inductance reactance value includes:

[0013] Converting the rotational vector of the rotor current into a d-axis component of the rotor current and a q-axis component of the rotor current;

[0014] Calculating the sum of the squares of the d-axis component of the rotor current and the q-axis component of the rotor current;

[0015] Performing a square root operation on the sum of the squares and multiplying the operation result by the mutual inductance reactance value to obtain the amplitude of the internal electromotive force of the doubly-fed fan.

[0016] Further, determining the regulation quantity according to a preset proportional regulator, the amplitude of the internal electromotive force, and the measured amplitude of the internal electromotive force of the doubly-fed fan includes:

[0017] Subtracting the measured amplitude of the internal electromotive force from the amplitude of the internal electromotive force to obtain an internal electromotive force amplitude deviation;

[0018] Inputting the internal electromotive force amplitude deviation into the proportional regulator so that the proportional regulator outputs the regulation quantity; wherein, the gain coefficient in the proportional regulator has been preset.

[0019] Further, determining the phase-locked frequency error according to the three-phase terminal voltage and the regulation quantity includes:

[0020] Performing a park transformation on the three-phase terminal voltage to obtain a q-axis component of the terminal voltage;

[0021] Adding the q-axis component of the terminal voltage and the regulation quantity to obtain a composite variable;

[0022] Inputting the composite variable into the phase-locked loop of the doubly-fed fan so that the phase-locked loop outputs the phase-locked frequency error.

[0023] Further, determining the phase-locked phase based on the phase-locked frequency error and a preset rated frequency includes:

[0024] Adding the phase-locked frequency error and the rated frequency to obtain a phase-locked frequency;

[0025] Calculating the phase-locked phase according to the phase-locked frequency.

[0026] An embodiment of the present invention further provides an active power regulation device for a doubly-fed fan, including: a data acquisition module, an internal electromotive force amplitude determination module, a regulation quantity calculation module, a phase-locked frequency error calculation module, a phase-locked phase calculation module, and a regulation module;

[0027] The data acquisition module is used to acquire the rotor current rotating vector, three-phase terminal voltage and mutual inductance reactance value of the doubly-fed wind turbine;

[0028] The internal potential amplitude determination module is used to determine the internal potential amplitude of the doubly-fed wind turbine according to the rotor current rotating vector and the mutual inductance reactance value;

[0029] The regulation quantity calculation module is used to determine the regulation quantity according to a preset proportional regulator, the internal potential amplitude and the measured internal potential amplitude of the doubly-fed wind turbine;

[0030] The phase-locked frequency error calculation module is used to determine the phase-locked frequency error according to the three-phase terminal voltage and the regulation quantity;

[0031] The phase-locked phase calculation module is used to determine the phase-locked phase based on the phase-locked frequency error and a preset rated frequency;

[0032] The regulation module is used to regulate the active power of the doubly-fed wind turbine according to the phase-locked phase.

[0033] Further, the determining the regulation quantity according to a preset proportional regulator, the internal potential amplitude and the measured internal potential amplitude of the doubly-fed wind turbine includes:

[0034] Subtracting the measured internal potential amplitude from the internal potential amplitude to obtain an internal potential amplitude deviation;

[0035] Inputting the internal potential amplitude deviation into the proportional regulator so that the proportional regulator outputs the regulation quantity; wherein, the gain coefficient in the proportional regulator has been preset.

[0036] Further, the determining the phase-locked frequency error according to the three-phase terminal voltage and the regulation quantity includes:

[0037] Performing a park transformation on the three-phase terminal voltage to obtain a q-axis component of the terminal voltage;

[0038] Adding the q-axis component of the terminal voltage and the regulation quantity to obtain a composite variable;

[0039] Inputting the composite variable into the phase-locked loop of the doubly-fed wind turbine so that the phase-locked loop outputs the phase-locked frequency error.

[0040] This application also provides a terminal device, including:

[0041] One or more processors;

[0042] A memory, coupled to the processor, for storing one or more programs;

[0043] When the one or more programs are executed by the one or more processors, the one or more processors implement the active power regulation method for a doubly-fed wind turbine as described in the above-mentioned invention embodiments.

[0044] This application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the active power regulation method for a doubly-fed wind turbine as described in the above-mentioned invention embodiments is implemented.

[0045] By implementing the present invention, the following beneficial effects are achieved:

[0046] The present invention provides an active power regulation method, device, terminal device and storage medium for a doubly-fed wind turbine. The method determines a regulation amount according to a preset proportional regulator, the amplitude of the internal electromotive force, and the measured amplitude of the internal electromotive force of the doubly-fed wind turbine; then determines the phase-locked frequency error according to the three-phase terminal voltage and the regulation amount, determines the phase-locked phase based on the phase-locked frequency error and a preset rated frequency, and regulates the active power of the doubly-fed wind turbine according to the phase-locked phase.

[0047] Thus, by changing the input of the phase-locked loop and determining the phase-locked frequency error, the power angle between the internal electromotive force and the terminal voltage of the doubly-fed wind turbine can change rapidly during a disturbance, breaking the state where the original power angle difference remains unchanged, so that the doubly-fed wind turbine can adjust the output active power according to the system demand. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] To more clearly illustrate the technical solutions of the present application, the drawings required for implementation will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0049] Figure 1 is a schematic flowchart of the active power regulation method for a doubly-fed wind turbine provided by an embodiment of the present application;

[0050] Figure 2 is a schematic diagram of the structure of a doubly-fed wind turbine provided by an embodiment of the present application;

[0051] Figure 3 is a control block diagram of a doubly-fed wind turbine provided by an embodiment of the present application;

[0052] Figure 4 is a waveform diagram of the active power output by the wind turbine when the doubly-fed wind turbine responds to the system's deficit active power under different control parameters K provided by an embodiment of the present application;

[0053] Figure 5 It is a waveform diagram of the angular frequency of a doubly-fed wind turbine when responding to the active power of the system deficit under different control parameters K provided by an embodiment of the present application;

[0054] Figure 6 It is a schematic structural diagram of an active power regulating device of a doubly-fed wind turbine provided by an embodiment of the present application;

[0055] Figure 7 It is a schematic structural diagram of a terminal device provided by an embodiment of the present application. Specific embodiments

[0056] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0058] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order, or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0059] Referring to "embodiments" herein means that the specific features, structures, or characteristics described in connection with the embodiments may be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0060] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0061] In the description of the embodiments of the present application, the term "plurality" means two or more (including two). Similarly, "multiple groups" means two or more groups (including two groups), and "multiple pieces" means two or more pieces (including two pieces).

[0062] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0063] The following are the professional terms and well-known technical contents involved in the embodiments of the present invention:

[0064] (1) Doubly-fed wind turbine: It is a power generation device that converts wind energy into electrical energy. The components of its electrical part include a wound asynchronous generator, a gearbox, a DC capacitor, a switching tube, a controller, and an output port filter; the control part of the doubly-fed wind turbine consists of a phase-locked loop, speed control, pitch angle control, DC voltage control, terminal voltage control, and current control.

[0065] See Figure 1 , to solve the problem that the existing doubly-fed wind turbine cannot provide effective power support for the system when the system is disturbed due to its limited self-regulation ability, a flowchart of an active power regulation method for a doubly-fed wind turbine provided by an embodiment of the present invention includes:

[0066] S1. Obtain the rotor current rotating vector, three-phase terminal voltage, and mutual inductance reactance value of the doubly-fed wind turbine;

[0067] See Figure 2 , which is a structural schematic diagram of the doubly-fed wind turbine provided in this embodiment;

[0068] Specifically, collect the three-phase terminal voltage at the grid connection point, and denote the three-phase terminal voltage as V a 、V b 、V c ; measure the rotor current rotating vector I r at the wound asynchronous motor of the doubly-fed wind turbine; obtain the mutual inductance reactance value X m of the doubly-fed wind turbine;

[0069] It should be noted that the terminal voltage can be collected by means of tools such as a data acquisition card, a multimeter, or a voltage-current sensor; the grid connection point here refers to the interface point where the doubly-fed wind turbine outputs electric energy to the power grid.

[0070] S2. Determine the amplitude of the internal electromotive force of the doubly-fed wind turbine according to the rotating vector of the rotor current and the mutual inductance reactance value;

[0071] In a preferred embodiment, the determining the amplitude of the internal electromotive force of the doubly-fed wind turbine according to the rotor current and the mutual inductance reactance value includes:

[0072] Convert the rotating vector of the rotor current into the d-axis component of the rotor current and the q-axis component of the rotor current;

[0073] Calculate the sum of the squares of the d-axis component of the rotor current and the q-axis component of the rotor current;

[0074] Perform a square root operation on the sum of the squares, and multiply the operation result by the mutual inductance reactance value to obtain the amplitude of the internal electromotive force of the doubly-fed wind turbine;

[0075] Schematically, the calculation expression of the amplitude of the internal electromotive force is specifically as follows:

[0076]

[0077] In the formula, E represents the amplitude of the internal electromotive force of the doubly-fed wind turbine; I rd represents the d-axis component of the rotor current; I rq represents the q-axis component of the rotor current;

[0078] Specifically, convert the rotating vector I r of the rotor current into the d-axis component I rd of the rotor current and the q-axis component I rq of the rotor current, then calculate the sum of the squares of the d-axis component of the rotor current and the q-axis component of the rotor current to obtain Then perform a square root operation on the sum of the squares to obtain the operation result Multiply the operation result by the mutual inductance reactance value X m to calculate and obtain the amplitude E of the internal electromotive force of the doubly-fed wind turbine.

[0079] S3. Determine the regulation quantity according to a preset proportional regulator, the amplitude of the internal electromotive force, and the measured amplitude of the internal electromotive force of the doubly-fed wind turbine;

[0080] In a preferred embodiment, the determining the regulation quantity according to a preset proportional regulator, the amplitude of the internal electromotive force, and the measured amplitude of the internal electromotive force of the doubly-fed wind turbine includes:

[0081] Subtract the measured internal potential amplitude from the internal potential amplitude to obtain the internal potential amplitude deviation;

[0082] Input the internal potential amplitude deviation into the proportional regulator so that the proportional regulator outputs the regulation quantity; wherein, the gain coefficient in the proportional regulator has been preset;

[0083] See Figure 3 , which is the control block diagram of the doubly-fed wind turbine provided in this embodiment;

[0084] Specifically, Figure 3 The gain coefficient K of the proportional regulator in the internal potential amplitude regulation part shown has been preset; wherein, the gain coefficient K can be set to 0, 0.1, 0.3, 0.5;

[0085] It should be noted that the measured internal potential amplitude of the doubly-fed wind turbine is obtained by measurement; the internal potential amplitude is a steady-state value.

[0086] Specifically, subtract the measured internal potential amplitude E0 of the doubly-fed wind turbine from the internal potential amplitude E to obtain the internal potential amplitude deviation ΔE, and then input the internal potential amplitude deviation ΔE into the proportional regulator to output the regulation quantity E com , and its calculation expression is specifically as follows:

[0087] E com =K(E - E0);

[0088] In the formula, E represents the internal potential amplitude; E0 represents the measured internal potential amplitude; K represents the gain coefficient.

[0089] S4. Determine the phase-locked frequency error according to the three-phase terminal voltage and the regulation quantity;

[0090] In a preferred embodiment, the determining the phase-locked frequency error according to the three-phase terminal voltage and the regulation quantity includes:

[0091] Perform park transformation on the three-phase terminal voltage to obtain the q-axis component of the terminal voltage;

[0092] Add the q-axis component of the terminal voltage and the regulation quantity to obtain a composite variable;

[0093] Input the composite variable into the phase-locked loop of the doubly-fed wind turbine so that the phase-locked loop outputs the phase-locked frequency error;

[0094] Specifically, perform park transformation on the three-phase terminal voltages V a , V b , V c obtained in step S1 to obtain the q-axis component V of the terminal voltageq , and then add the q-axis component V of the terminal voltage q and the regulation quantity E com , add them together, and input the obtained composite variable into the phase-locked loop of the doubly-fed fan, so as to determine the phase-locked frequency error The specific calculation formula is as follows:

[0095]

[0096] In the formula, K ppll represents the proportionality coefficient; K ipll represents the integral coefficient; s represents the Laplace operator, which is a complex variable in the Laplace transform;

[0097] It should be noted that the proportionality coefficient K ppll and the integral coefficient K ipll of the phase-locked loop have been preset; under steady state, E com =0, which does not affect the normal phase-locking function of the phase-locked loop;

[0098] Taking the example of the lack of active power disturbance in the system, when the total load increases, the instantaneous output current of each generator in the system increases. Since the terminal voltage control is used, the amplitude of the fan terminal voltage changes little, so the amplitude of the internal potential of the fan increases, and then E com increases; by changing the input quantity of the phase-locked loop, the phase of the terminal voltage of the doubly-fed fan changes rapidly during the disturbance process, and the power angle difference between the internal potential of the fan and the terminal voltage changes rapidly, so that the active power output by the fan changes accordingly to provide the active power support ability.

[0099] S5. Determine the phase-locked phase based on the phase-locked frequency error and the preset rated frequency;

[0100] In a preferred embodiment, the determining the phase-locked phase based on the phase-locked frequency error and the preset rated frequency includes:

[0101] Add the phase-locked frequency error and the rated frequency to obtain the phase-locked frequency;

[0102] Calculate the phase-locked phase according to the phase-locked frequency;

[0103] Specifically, add the phase-locked frequency error and the preset rated frequency ω nom to obtain the phase-locked frequency ω p , and then determine the phase-locked phase θ p according to the phase-locked frequency ω p , and the specific calculation formula is as follows:

[0104]

[0105] S6. According to the phase-locked phase, the active power of the doubly-fed wind turbine is regulated;

[0106] Specifically, according to the phase-locked phase θ p , the q-axis component of the terminal voltage V of the doubly fed wind turbine q Adjust the terminal voltage q-axis component V q , thus, the phase-locked loop controls V q = 0 to achieve steady state θ p =θ vt function, at this time, the phase-locked loop output frequency is the system frequency in steady state, and the specific calculation formula is as follows:

[0107]

[0108] In the formula, θ p Indicates the phase-locked phase of the phase-locked loop output; θ vt Indicates the actual phase of the terminal voltage vector;

[0109] It should be noted that the actual phase of the terminal voltage vector has been pre-acquired according to the system operation status;

[0110] Specifically, see Figure 4 and Figure 5 The principle of improving the transient active power support capability of the doubly fed wind turbine in this application is based on the PI control characteristics of the phase-locked loop; in PI control, its input quantity has a regulation trend tending to zero; taking the wind turbine response to the system shortage of active power as an example, the internal potential amplitude increases and the system frequency decreases during the response process, resulting in the terminal voltage q-axis component V q The terminal voltage component decreases, and the expression of the terminal voltage component in the synchronous rotating coordinate system is:

[0111]

[0112] Where, V represents the terminal voltage amplitude; V d Represents the d-axis component of the terminal voltage; ω vt Represents the terminal voltage frequency; ω0 represents the synchronous rotating coordinate system frequency, and its value is 100πrad / s for a 50Hz power system;

[0113] When the system frequency decreases, ω vt <ω0, so V q <0, the terminal voltage phase decreases, and the power angle difference δ between it and the internal potential increases, which increases the active power output of the wind turbine;

[0114] On the other hand, due to the increase in the internal potential amplitude, E com Increase, under the control of the controller and phase-locked loop designed in this application, ω pWith θ p increases, which causes the power angle difference δ to increase and the active power output to increase. The expression for active power is:

[0115]

[0116] In the formula, E represents the amplitude of the internal electromotive force, which is almost unchanged at the moment of response; X s represents the stator reactance of the doubly-fed wind turbine; δ represents the power angle difference between the internal electromotive force and the terminal voltage;

[0117] When the amplitude of the internal electromotive force increases and the amplitude of the terminal voltage is approximately unchanged, the power angle difference increases, and the active power output of the wind turbine increases, playing a supporting role;

[0118] It should be noted that the essence of the grid connection of the doubly-fed wind turbine is the grid connection of the internal electromotive force, and the internal electromotive force is determined by the rotor current; in the control, the command value of the rotor current component is generated by the speed control and the terminal voltage control. The frequency dynamics of the internal electromotive force are jointly formed by the dynamics of the internal electromotive force components in the phase-locked coordinate system and the phase-locked dynamics. The specific expressions are as follows:

[0119]

[0120] In the formula, θ E is the phase of the internal electromotive force; θ p is the phase-locked phase; is the dq component of the internal electromotive force.

[0121] Refer to Figure 6 , which is an active power regulation device for a doubly-fed wind turbine provided by an embodiment of the present invention, including: a data acquisition module, an internal electromotive force amplitude determination module, a regulation quantity calculation module, a phase-locked frequency error calculation module, a phase-locked phase calculation module, and a regulation module;

[0122] The data acquisition module is used to acquire the rotor current rotating vector, three-phase terminal voltage, and mutual inductance reactance value of the doubly-fed wind turbine;

[0123] The internal electromotive force amplitude determination module is used to determine the amplitude of the internal electromotive force of the doubly-fed wind turbine according to the rotor current rotating vector and the mutual inductance reactance value;

[0124] The regulation quantity calculation module is used to determine the regulation quantity according to a preset proportional regulator, the amplitude of the internal electromotive force, and the measured amplitude of the internal electromotive force of the doubly-fed wind turbine;

[0125] The phase-locked frequency error calculation module is used to determine the phase-locked frequency error according to the three-phase terminal voltage and the regulation quantity;

[0126] The phase-locked phase calculation module is used to determine the phase-locked phase based on the phase-locked frequency error and a preset rated frequency;

[0127] The regulation module is used to regulate the active power of the doubly-fed wind turbine according to the phase-locked phase.

[0128] In a preferred embodiment, determining the regulation quantity according to a preset proportional regulator, the amplitude of the internal potential, and the measured amplitude of the internal potential of the doubly-fed wind turbine includes:

[0129] Subtracting the amplitude of the internal potential from the measured amplitude of the internal potential to obtain an internal potential amplitude deviation;

[0130] Inputting the internal potential amplitude deviation into the proportional regulator so that the proportional regulator outputs the regulation quantity; wherein, the gain coefficient in the proportional regulator has been preset.

[0131] In a preferred embodiment, determining the phase-locked frequency error according to the three-phase terminal voltage and the regulation quantity includes:

[0132] Performing a park transformation on the three-phase terminal voltage to obtain the q-axis component of the terminal voltage;

[0133] Adding the q-axis component of the terminal voltage and the regulation quantity to obtain a composite variable;

[0134] Inputting the composite variable into the phase-locked loop of the doubly-fed wind turbine so that the phase-locked loop outputs the phase-locked frequency error.

[0135] See Figure 7 , a terminal device is further provided in an embodiment of the present application, including:

[0136] One or more processors;

[0137] A memory coupled to the processor for storing one or more programs;

[0138] When the one or more programs are executed by the one or more processors, the one or more processors implement the method for regulating the active power of the doubly-fed wind turbine as described above.

[0139] The processor is used to control the overall operation of the terminal device to complete all or part of the steps of the active power regulation method of the doubly-fed fan described above. The memory is used to store various types of data to support the operation of the terminal device. Such data may include, for example, instructions for any application or method operating on the terminal device, as well as application-related data. The memory can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.

[0140] In an exemplary embodiment, the terminal device can be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors or other electronic components, and is used to execute the active power regulation method of the doubly-fed fan described in any of the above embodiments, and achieve the same technical effects as the above method.

[0141] In another exemplary embodiment, a computer-readable storage medium including a computer program is further provided. When the computer program is executed by a processor, it implements the steps of the active power regulation method of the doubly-fed fan described in any of the above embodiments. For example, the computer-readable storage medium can be the memory including the computer program described above. The above computer program can be executed by the processor of the terminal device to complete the active power regulation method of the doubly-fed fan described in any of the above embodiments, and achieve the same technical effects as the above method.

[0142] The above are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. A method for regulating the active power of a doubly-fed wind turbine, characterized in that including: obtaining the rotor current rotating vector, three-phase terminal voltage and mutual inductance reactance value of the doubly-fed wind turbine; determining the amplitude of the internal electromotive force of the doubly-fed wind turbine according to the rotor current rotating vector and the mutual inductance reactance value; determining a regulation quantity according to a preset proportional regulator, the amplitude of the internal electromotive force and the measured amplitude of the internal electromotive force of the doubly-fed wind turbine; determining a phase-locked frequency error according to the three-phase terminal voltage and the regulation quantity; determining a phase-locked phase based on the phase-locked frequency error and a preset rated frequency; regulating the active power of the doubly-fed wind turbine according to the phase-locked phase.

2. The active power regulation method of the doubly-fed fan according to claim 1, characterized in that The determining the amplitude of the internal electromotive force of the doubly-fed wind turbine according to the rotor current rotating vector and the mutual inductance reactance value includes: converting the rotor current rotating vector into a rotor current d-axis component and a rotor current q-axis component; calculating the sum of the squares of the rotor current d-axis component and the rotor current q-axis component; performing a square root operation on the sum of the squares and multiplying the operation result by the mutual inductance reactance value to obtain the amplitude of the internal electromotive force of the doubly-fed wind turbine.

3. The active power regulation method of the doubly-fed fan according to claim 1, characterized in that The determining a regulation quantity according to a preset proportional regulator, the amplitude of the internal electromotive force and the measured amplitude of the internal electromotive force of the doubly-fed wind turbine includes: subtracting the measured amplitude of the internal electromotive force from the amplitude of the internal electromotive force to obtain an amplitude deviation of the internal electromotive force; inputting the amplitude deviation of the internal electromotive force into the proportional regulator so that the proportional regulator outputs the regulation quantity; wherein, the gain coefficient in the proportional regulator has been preset.

4. The active power regulation method of the doubly-fed fan according to claim 1, characterized in that The determining a phase-locked frequency error according to the three-phase terminal voltage and the regulation quantity includes: performing a park transformation on the three-phase terminal voltage to obtain a terminal voltage q-axis component; adding the terminal voltage q-axis component and the regulation quantity to obtain a composite variable; inputting the composite variable into the phase-locked loop of the doubly-fed wind turbine so that the phase-locked loop outputs the phase-locked frequency error.

5. The active power regulation method of the doubly-fed fan according to claim 1, characterized in that The determining a phase-locked phase based on the phase-locked frequency error and a preset rated frequency includes: adding the phase-locked frequency error and the rated frequency to obtain a phase-locked frequency; calculating the phase-locked phase according to the phase-locked frequency.

6. A method and device for regulating the active power of a doubly-fed fan, characterized in that, including: a data acquisition module, an internal electromotive force amplitude determination module, a regulation quantity calculation module, a phase-locked frequency error calculation module, a phase-locked phase calculation module and a regulation module; the data acquisition module is configured to obtain the rotor current rotating vector, three-phase terminal voltage and mutual inductance reactance value of the doubly-fed wind turbine; the internal electromotive force amplitude determination module is configured to determine the amplitude of the internal electromotive force of the doubly-fed wind turbine according to the rotor current rotating vector and the mutual inductance reactance value; the regulation quantity calculation module is configured to determine a regulation quantity according to a preset proportional regulator, the amplitude of the internal electromotive force and the measured amplitude of the internal electromotive force of the doubly-fed wind turbine; the phase-locked frequency error calculation module is configured to determine a phase-locked frequency error according to the three-phase terminal voltage and the regulation quantity; the phase-locked phase calculation module is configured to determine a phase-locked phase based on the phase-locked frequency error and a preset rated frequency; The control module is used to regulate the active power of the doubly-fed wind turbine according to the phase-locked phase.

7. The active power regulation method and device according to claim 6, characterized in that, Determining the control quantity according to a preset proportional regulator, the amplitude of the internal potential, and the measured amplitude of the internal potential of the doubly-fed wind turbine includes: Subtracting the measured amplitude of the internal potential from the amplitude of the internal potential to obtain the deviation of the amplitude of the internal potential; Inputting the deviation of the amplitude of the internal potential into the proportional regulator so that the proportional regulator outputs the control quantity; wherein, the gain coefficient in the proportional regulator has been preset.

8. The active power regulation method and device according to claim 6, characterized in that Determining the phase-locked frequency error according to the three-phase terminal voltage and the control quantity includes: Performing a park transformation on the three-phase terminal voltage to obtain the q-axis component of the terminal voltage; Adding the q-axis component of the terminal voltage and the control quantity to obtain a composite variable; Inputting the composite variable into the phase-locked loop of the doubly-fed wind turbine so that the phase-locked loop outputs the phase-locked frequency error.

9. A terminal device, characterized in that, Including: One or more processors; A memory coupled to the processor for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the active power regulation method of the doubly-fed wind turbine according to any one of claims 1-5.

10. A storage medium, on which a computer program is stored, characterized in that, When the computer program is executed by a processor, it implements the active power regulation method of the doubly-fed wind turbine according to any one of claims 1-5.

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