Control method and system of voltage source type wind power converter

Abstract

The invention provides a control method and system of a voltage source type wind power converter, and belongs to the field of wind power generation. The method comprises the following steps: determining a voltage modulation signal finally output by the wind power converter based on a wind power converter grid-side simulation model, and collecting an analog quantity signal based on the wind power converter grid-side simulation model; if the analog quantity signal does not meet the power grid power control demand information, determining voltage amplitude demand data; obtaining a voltage modulation signal based on the voltage source type wind power converter control strategy and the voltage amplitude demand data; transmitting the voltage modulation signal to the wind power converter grid-side simulation model to update power grid data, receiving a new analog quantity signal fed back by the wind power converter grid-side simulation model after the power grid data is updated, and repeatedly executing the steps until the analog quantity signal meets the power grid power control demand information. And obtaining a voltage modulation signal finally output by the wind power converter. And the purpose of quickly adapting to the requirement of new energy grid connection is achieved.

Description

Technical Field

[0001] The present invention relates to the field of wind power generation, and in particular to a control method for a voltage source type wind power converter, a control system for a voltage source type wind power converter, a machine-readable storage medium and an electronic device. Background Art

[0002] With the large-scale access of wind turbines, the power grid further presents the characteristics of "double high", "double new" and "double peak". Among them, "double high" refers to the "double high" characteristics of the power system with a high proportion of renewable energy and a high proportion of power electronic equipment, "double peak" refers to the peak load in summer and winter of the power grid, and "double new" refers to the new energy and new technology applied in the new power system. The high proportion of wind turbine access will have an impact on the stability of the power grid that cannot be ignored. Since the active power and reactive power of the wind turbine adopt the phase angle and voltage of the power grid, it is equivalent to only controlling the amplitude of the current sent to the power grid and its phase relative to the voltage. Therefore, traditional wind power converters are often called current sources.

[0003] At present, traditional wind power converters all adopt the "current source mode", which cannot build a 100% new energy system. They are often unable to support the power grid in low short-circuit ratio and weak AC systems, resulting in frequency and voltage collapse, power oscillation, and unit disconnection from the grid.

[0004] In the existing technology, due to the frequent occurrence of power grid failures, the anti-interference ability of the converter and the operating ability to cope with power grid accidents are also gradually improving and perfecting. The upgrade and verification of traditional converter control strategies are extremely dependent on on-site testing conditions and the ability to reproduce power grid failures, which brings great inconvenience to the upgrade of control strategies and algorithm verification, resulting in the inability to respond to power grid needs in a timely manner.

[0005] At present, for traditional wind power converters, for low short-circuit ratio and weak AC system application environments, control strategies such as increasing virtual impedance and weakening PI parameters are usually adopted to passively respond to various working conditions of the power grid. At present, traditional wind power converters can only be customized for known power grid characteristics. When a power grid fault occurs, the wind power converter can only force the output of specific active current or reactive current to the power grid to help the power grid recover. However, the output specific active current or reactive current is detected and controlled according to the fixed logic. When the power grid fluctuation is different from the expected, it is very easy to cause a chain reaction of power grid failure and worsen the power grid failure. In addition, when the traditional wind power converter is currently tested for function or performance, it needs to be tested on the actual unit on site, and there are high requirements for the working conditions of the wind turbine unit during the test, and it needs to be tested separately under different wind conditions.

[0006] It can be seen that there are the following problems when applying traditional wind power converters to power grids: 1. Although the current traditional wind power converter can be used in low short-circuit ratio and weak AC system application environment, the adaptability of the traditional wind power converter is narrow and can only be applied to specific working conditions. Different PI parameters can only be applied to different working conditions. With the current technology, it is not possible to achieve the same set of parameters to apply to different short-circuit ratios and other working conditions, and the applicability is poor; 2. Traditional wind power converters are controlled according to a pre-set mode at the time of grid failure. Due to the complexity of grid conditions, it is impossible to classify all conditions at the beginning of the design. Therefore, in actual applications, wind power converter disconnection accidents caused by grid failures often occur; 3. In the test process of wind power converter control strategy, traditional testing methods have great limitations. In addition, due to the unstable characteristics of new energy wind resources, ideal test conditions are very rare in the actual test process, which adds a lot of uncertainty to the test tooling and greatly prolongs the test cycle.

[0007] Therefore, there is an urgent need to solve the problem of how to use wind power converters to respond to various working conditions of the power grid in a timely manner, so as to solve the problems of complex working conditions of traditional high-penetration tests, unstable wind resources and poor grid-connected applicability of wind power converters. Summary of the invention

[0008] The purpose of the embodiments of the present invention is to provide a control method and system for a voltage source wind power converter, so as to at least solve the above-mentioned problem of how to use the wind power converter to respond to various working conditions of the power grid in a timely manner.

[0009] In order to achieve the above object, the present invention provides a control method of a voltage source wind power converter in a first aspect, which is executed by a controller of the wind power converter, wherein the wind power converter is connected to a power grid, and the method comprises: Based on the pre-built grid-side simulation model of the wind power converter, determine the voltage modulation signal that the wind power converter will eventually output, including: S110: collecting analog signals based on a pre-built grid-side simulation model of a wind power converter; S120: determining whether the analog signal meets the power control requirement information of the power grid; if the analog signal does not meet the power control requirement information of the power grid, determining the voltage amplitude requirement data according to the power control requirement information of the power grid and the analog signal; S130: based on the voltage source wind power converter control strategy and the voltage amplitude requirement data, modulate the voltage used to control the power grid to obtain a voltage modulation signal; S140: Transmit the voltage modulation signal to the grid-side simulation model of the wind power converter to update the grid data, and receive the new analog signal fed back by the grid-side simulation model of the wind power converter after the grid data update as the collected analog signal, and repeat S120 to S140 until the analog signal meets the grid power control requirement information, and obtain the voltage modulation signal finally output by the wind power converter.

[0010] Optionally, the above-mentioned determination of whether the analog signal meets the power grid power control requirement information includes: Based on the analog signal, calculate the real-time power output of the current wind power converter; Generate a voltage angle and a voltage amplitude for controlling the power grid according to the power control demand information of the power grid and the real-time power currently output by the wind power converter; Calculate the electrical signal data of the current wind power converter according to the analog signal and the voltage angle output by the current wind power converter; The voltage angle and voltage amplitude used to control the power grid and the electrical signal data of the current wind power converter are compared, and based on the comparison result, it is determined whether the analog signal meets the power control requirement information of the power grid.

[0011] Optionally, the above-mentioned determining the voltage amplitude requirement data according to the power grid power control requirement information and the analog signal includes: Based on the comparison result, voltage amplitude requirement data is generated through a PI regulator; wherein the voltage amplitude requirement data represents the active voltage amplitude data and reactive voltage amplitude data that the wind power converter needs to output.

[0012] Optionally, the real-time power currently output by the wind power converter includes active power and reactive power currently output by the wind power converter.

[0013] Optionally, the rules of the voltage source wind power converter control strategy include: Calculating a grid voltage vector for controlling the grid based on the voltage amplitude demand data and a voltage angle for controlling the grid; When a virtual resistive device is provided on the grid side, the voltage drop generated by the virtual resistive device is integrated and changed with a grid voltage vector for controlling the grid to obtain a voltage modulation signal.

[0014] Optionally, the building rules of the above-mentioned wind power converter grid-side simulation model include: Based on the grid-side circuit information of the wind power converter to be simulated, the grid-side simulation model of the wind power converter is built using the RTLAB semi-physical simulation rules; Among them, the grid-side simulation model of the wind power converter includes one or more of the grid simulation model under normal operating conditions, the low voltage ride-through grid simulation model, the high voltage ride-through grid simulation model, the low-high ride-through fault interlocking grid simulation model, the impedance measurement simulation model, the converter grid-side inductor device model, the converter grid-side capacitor device model, the grid-side switch device model, the charging switch device model, the DC side capacitor device model, the IGBT equivalent model, the switch model and the analog signal model.

[0015] Optionally, a data conversion board is provided between the controller of the wind power converter and the grid-side simulation model of the wind power converter; The data conversion board is used to transmit the analog signal output by the grid-side simulation model of the wind power converter to the controller of the wind power converter, and transmit the voltage modulation signal finally output by the wind power converter to the grid-side simulation model of the wind power converter.

[0016] A second aspect of the present invention provides a control system for a voltage source wind power converter, which is applied to a controller of a wind power converter, wherein the wind power converter is connected to a power grid, and the system comprises: The voltage modulation module is used to determine the voltage modulation signal ultimately output by the wind power converter based on the pre-built grid-side simulation model of the wind power converter, including: An analog signal acquisition unit is used to acquire analog signals based on a pre-built grid-side simulation model of a wind power converter; A voltage amplitude requirement data determination unit is used to determine whether the analog signal meets the power grid power control requirement information, and if the analog signal does not meet the power grid power control requirement information, determine the voltage amplitude requirement data according to the power grid power control requirement information and the analog signal; A voltage modulation signal obtaining unit is used to modulate the voltage used to control the power grid based on the voltage source wind power converter control strategy and the voltage amplitude requirement data to obtain a voltage modulation signal; The voltage modulation signal adjustment unit is used to transmit the voltage modulation signal to the grid-side simulation model of the wind power converter to update the grid data, and receive the new analog signal fed back by the grid-side simulation model of the wind power converter after the grid data is updated as the collected analog signal, and repeatedly execute the voltage amplitude requirement data determination unit to the voltage modulation signal adjustment unit until the analog signal meets the grid power control requirement information, thereby obtaining the voltage modulation signal finally output by the wind power converter.

[0017] In a third aspect of the present invention, a machine-readable storage medium is provided, on which instructions are stored. When the instructions are executed by a processor, the processor is configured to execute the control method of the voltage source wind power converter.

[0018] In a fourth aspect of the present invention, an electronic device is provided, the electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the control method of the voltage source wind power converter when executing the computer program.

[0019] Through the above technical scheme, a control method and system for a voltage source type wind power converter is provided, which uses a pre-built grid-side simulation model of a wind power converter to control the voltage modulation signal finally output by the wind power converter. First, the analog signal is collected through the pre-built grid-side simulation model of the wind power converter. When the analog signal does not meet the power grid power control demand information, the voltage amplitude demand data is determined according to the power grid power control demand information and the analog signal. Thus, according to the control strategy of the voltage source type wind power converter and the voltage amplitude demand data, the voltage used to control the power grid is modulated to obtain a voltage modulation signal. The voltage modulation signal is transmitted to the grid-side simulation model of the wind power converter to update the grid data, and the new analog signal fed back by the grid-side simulation model of the wind power converter after the grid data is updated is received as the collected analog signal to complete the voltage source type control within a control cycle. According to the steps of obtaining the voltage modulation signal, the voltage modulation signal output by the wind power converter and the analog signal fed back by the grid-side simulation model of the wind power converter are continuously updated until the analog signal meets the power grid power control demand information, and the voltage modulation signal finally output by the wind power converter is obtained. The method and system can optimize the grid-connected characteristics of the traditional wind power converter through the control process of the voltage source wind power converter, solve the problems of poor grid-connected adaptability of the traditional wind power converter in low short-circuit ratio and weak AC system, weak grid support capability of the traditional wind power converter in the event of grid failure, and difficulty in verifying the simulation control strategy of the traditional wind power converter, and achieve the purpose of being able to quickly adapt to the needs of new energy grid connection, and also achieve the purpose of using the wind power converter to respond to various working conditions of the grid in a timely manner.

[0020] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings: Figure 1 It is a flow chart of a control method of a voltage source wind power converter provided by an embodiment of the present invention; Figure 2 It is a circuit diagram of a control strategy of a voltage source wind power converter provided by an embodiment of the present invention; Figure 3 It is a schematic diagram of building a grid-side simulation model of a wind power converter provided by an embodiment of the present invention; Figure 4 The invention is a block diagram of a control system of a voltage source wind power converter provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0022] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0023] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0024] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0025] Figure 1 FIG. 1 is a flow chart of a control method for a voltage source wind power converter provided by an embodiment of the present invention. Figure 1 As shown, an embodiment of the present invention provides a control method for a voltage source wind power converter, which is executed by a controller of the wind power converter, and the wind power converter is connected to a power grid. The method includes: Based on the pre-built grid-side simulation model of the wind power converter, determine the voltage modulation signal that the wind power converter will eventually output, including: S110: collecting analog signals based on a pre-built grid-side simulation model of a wind power converter; S120: determining whether the analog signal meets the power control requirement information of the power grid; if the analog signal does not meet the power control requirement information of the power grid, determining the voltage amplitude requirement data according to the power control requirement information of the power grid and the analog signal; Please refer to Figure 2 , Figure 2 It is a circuit diagram of a control strategy of a voltage source wind power converter provided by an embodiment of the present invention. In some embodiments of this embodiment, the above-mentioned judgment of whether the analog signal meets the power control demand information of the power grid includes: calculating the real-time power output of the current wind power converter based on the analog signal; generating a voltage angle and a voltage amplitude for controlling the power grid according to the power control demand information of the power grid and the real-time power currently output by the wind power converter; calculating the electrical signal data of the current wind power converter according to the analog signal and the voltage angle output by the current wind power converter; comparing the voltage angle and the voltage amplitude for controlling the power grid and the electrical signal data of the current wind power converter, and determining whether the analog signal meets the power control demand information of the power grid based on the comparison result.

[0026] The analog signals may include 12 analog signals including grid current, grid voltage, DC bus voltage, grid-side current and capacitor current. The above-mentioned real-time power currently output by the wind power converter includes active power and reactive power currently output by the wind power converter.

[0027] In some implementations of this embodiment, the voltage amplitude requirement data is determined based on the power control requirement information of the power grid and the analog signal, including: based on the comparison result, generating the voltage amplitude requirement data through a PI regulator; wherein the voltage amplitude requirement data represents the active voltage amplitude data and reactive voltage amplitude data that the wind power converter needs to output.

[0028] Specifically, the active power and reactive power output by the current wind power converter are calculated by collecting the grid voltage signal and grid current signal from the pre-built wind power converter grid-side simulation model. According to the power control command issued by the current main control / grid, the grid power control demand information is obtained. According to the grid power control demand information and the real-time power currently output by the wind power converter, the voltage angle and voltage amplitude for controlling the grid are generated. According to the voltage angle output by the current wind power converter and the collected current and voltage signals, the electrical signal data of the current wind power converter (the electrical signal data includes active current, reactive voltage, active voltage and reactive voltage) are calculated. The voltage angle and voltage amplitude used to control the grid and the electrical signal data of the current wind power converter are compared, and the active voltage amplitude data and reactive voltage amplitude data required to be output by the wind power converter are generated through the PI regulator.

[0029] S130: based on the voltage source wind power converter control strategy and the voltage amplitude requirement data, modulate the voltage used to control the power grid to obtain a voltage modulation signal; In some implementations of the present embodiment, the rules of the above-mentioned voltage source wind power converter control strategy include: calculating the grid voltage vector used to control the grid based on the voltage amplitude demand data and the voltage angle used to control the grid; when a virtual resistive device is set on the grid side, the voltage drop generated by the virtual resistive device is integrated and changed with the grid voltage vector used to control the grid to obtain a voltage modulation signal.

[0030] Specifically, the active voltage amplitude data and reactive voltage amplitude data that the wind power converter needs to output and the voltage angle used to control the power grid are calculated to generate a power grid voltage vector used to control the power grid. In order to suppress the instability caused by the voltage source control characteristics under high short-circuit ratio, a virtual resistive device is set on the power grid side to increase the robustness of the voltage source inverter, and the voltage drop generated by the virtual resistive device (the virtual resistive device can be a virtual resistor) is superimposed on the output voltage, that is, the voltage drop generated by the virtual resistive device is integrated and changed with the power grid voltage vector used to control the power grid to obtain a voltage modulation signal, thereby completing the voltage source control within a control cycle (wherein a control cycle can be 5kHz).

[0031] S140: Transmit the voltage modulation signal to the grid-side simulation model of the wind power converter to update the grid data, and receive the new analog signal fed back by the grid-side simulation model of the wind power converter after the grid data update as the collected analog signal, and repeat S120 to S140 until the analog signal meets the grid power control requirement information, and obtain the voltage modulation signal finally output by the wind power converter.

[0032] Specifically, the method uses a pre-built wind power converter grid-side simulation model to control the voltage modulation signal finally output by the wind power converter. First, the analog signal is collected through the pre-built wind power converter grid-side simulation model. When the analog signal does not meet the power grid power control demand information, the voltage amplitude demand data is determined according to the power grid power control demand information and the analog signal. Thus, according to the voltage source wind power converter control strategy and the voltage amplitude demand data, the voltage used to control the power grid is modulated to obtain a voltage modulation signal. The voltage modulation signal is transmitted to the wind power converter grid-side simulation model to update the grid data, and the new analog signal fed back by the wind power converter grid-side simulation model after the grid data is updated is received as the collected analog signal to complete the voltage source control within a control cycle. According to the steps of obtaining the voltage modulation signal, the voltage modulation signal output by the wind power converter and the analog signal fed back by the wind power converter grid-side simulation model are continuously updated until the analog signal meets the power grid power control demand information, and the voltage modulation signal finally output by the wind power converter is obtained. This method can optimize the grid-connected characteristics of traditional wind power converters through the control process of voltage source wind power converters, solves the problems of poor grid-connected adaptability of traditional wind power converters in low short-circuit ratio and weak AC systems, weak grid support capability of traditional wind power converters in the event of grid failures, and difficulty in verifying simulation control strategies of traditional wind power converters, and achieves the purpose of quickly adapting to the needs of new energy grid connection, thus realizing the purpose of using wind power converters to respond in a timely manner to various working conditions of the power grid.

[0033] In the above implementation process, the method improves the grid-connected characteristics of new energy, increases the stability of wind power converter units, and increases power generation. It improves the fault ride-through characteristics of wind power converter units, reduces the situation of fault shutdown, and increases power generation. It reduces the difficulty of control strategy verification and greatly reduces the test cycle. And improves the test conditions.

[0034] In some implementations of this embodiment, the controller of the wind power converter can adopt TMS320F28335, which has a high-speed processing capability of 150MHz, a 32-bit floating-point processing unit, 6 DMA channels supporting ADC, McBSP and EMIF, and up to 18 PWM outputs, of which 6 are TI's unique higher-precision PWM outputs (HRPWM), and a 12-bit 16-channel ADC.

[0035] Please refer to Figure 3 , Figure 3 It is a schematic diagram of building a wind power converter grid-side simulation model provided by an embodiment of the present invention. In some embodiments of the present embodiment, the building rules of the above-mentioned wind power converter grid-side simulation model include: based on the grid-side loop information of the wind power converter to be simulated, the wind power converter grid-side simulation model is built using the RTLAB semi-physical simulation rules; wherein the wind power converter grid-side simulation model includes one or more of a grid simulation model under normal operating conditions, a low voltage ride-through grid simulation model, a high voltage ride-through grid simulation model, a low-high ride-through fault interlocking grid simulation model, an impedance measurement simulation model, a converter grid-side inductor device model, a converter grid-side capacitor device model, a grid-side switch device model, a charging switch device model, a DC side capacitor device model, an IGBT equivalent model, a switch model, and an analog signal model.

[0036] Specifically, the grid-side simulation model of the wind power converter is simulated using RTLAB. The construction of the grid-side simulation model of the wind power converter includes the construction of the following models: 1. Construction of power grid simulation module: including the construction of power grid simulation model under normal state, low voltage ride through, high voltage ride through, low voltage ride through fault interlocking and impedance measurement simulation model; 2. Grid-side topology construction: including the construction of passive components such as the grid-side inductor of the converter, the grid-side capacitor of the converter, the grid-side switch, the charging switch, and the DC-side capacitor; 3. Construction of grid-side control module: including the construction of IGBT equivalent model and switch model; 4. Construction of analog quantity model: including analog quantity acquisition for control of grid current, grid voltage, DC bus voltage, grid-side current and capacitor current, as well as signal acquisition and control of grid-side switches, charging switches, etc.

[0037] In some implementations of this embodiment, a data conversion board is arranged between the controller of the above-mentioned wind power converter and the grid-side simulation model of the wind power converter; the data conversion board is used to transmit the analog signal output by the grid-side simulation model of the wind power converter to the controller of the wind power converter, and transmit the voltage modulation signal finally output by the wind power converter to the grid-side simulation model of the wind power converter.

[0038] Specifically, the controller of the wind power converter is connected to the grid-side simulation model of the wind power converter through a data conversion board. The connection signals of the data conversion board include: 1. Analog signals for control of grid current, grid voltage, DC bus voltage, grid-side current, capacitor current, etc.; 2. Grid-side switch and charging switch signal acquisition and control; 3. Acquisition of drive signal and fault feedback signal of power module.

[0039] In some implementations of this embodiment, a method for controlling a voltage source wind power converter is used as follows: 1: Build the grid-side main circuit of the wind power converter that needs to be verified in RTLAB; 2: RTLAB transmits the main circuit signal (grid current, grid voltage, DC bus voltage, filter capacitor current, etc.) to the wind power converter through the data conversion board; 3: The grid-side controller of the wind power converter detects the analog signal sent by the data conversion board, and outputs the corresponding control signal to the data conversion board according to the set control strategy; 4: The data conversion board transmits the received control signal to RTLAB; 5: RTLAB updates the data according to the received signal and the current simulated main circuit status, and sends the new main circuit signal to the data conversion board, thus completing the control within a time period; 6: Repeat steps 3 to 5 to complete the simulation and verification of the wind power converter control strategy.

[0040] Figure 4 FIG. 1 is a block diagram of a control system of a voltage source wind power converter provided by an embodiment of the present invention. Figure 4 As shown, an embodiment of the present invention provides a control system of a voltage source wind power converter, which is applied to a controller of a wind power converter. The wind power converter is connected to a power grid. The system includes: The voltage modulation module is used to determine the voltage modulation signal ultimately output by the wind power converter based on the pre-built grid-side simulation model of the wind power converter, including: An analog signal acquisition unit is used to acquire analog signals based on a pre-built grid-side simulation model of a wind power converter; A voltage amplitude requirement data determination unit is used to determine whether the analog signal meets the power grid power control requirement information, and if the analog signal does not meet the power grid power control requirement information, determine the voltage amplitude requirement data according to the power grid power control requirement information and the analog signal; A voltage modulation signal obtaining unit is used to modulate the voltage used to control the power grid based on the voltage source wind power converter control strategy and the voltage amplitude requirement data to obtain a voltage modulation signal; The voltage modulation signal adjustment unit is used to transmit the voltage modulation signal to the grid-side simulation model of the wind power converter to update the grid data, and receive the new analog signal fed back by the grid-side simulation model of the wind power converter after the grid data is updated as the collected analog signal, and repeatedly execute the voltage amplitude requirement data determination unit to the voltage modulation signal adjustment unit until the analog signal meets the grid power control requirement information, thereby obtaining the voltage modulation signal finally output by the wind power converter.

[0041] Specifically, the system uses a pre-built wind power converter grid-side simulation model to control the voltage modulation signal finally output by the wind power converter. First, the analog signal is collected through the pre-built wind power converter grid-side simulation model. When the analog signal does not meet the power grid power control demand information, the voltage amplitude demand data is determined according to the power grid power control demand information and the analog signal. Thus, according to the voltage source wind power converter control strategy and the voltage amplitude demand data, the voltage used to control the grid is modulated to obtain a voltage modulation signal. The voltage modulation signal is transmitted to the wind power converter grid-side simulation model to update the grid data, and the new analog signal fed back by the wind power converter grid-side simulation model after the grid data is updated is received as the collected analog signal to complete the voltage source control within a control cycle. According to the steps of obtaining the voltage modulation signal, the voltage modulation signal output by the wind power converter and the analog signal fed back by the wind power converter grid-side simulation model are continuously updated until the analog signal meets the power grid power control demand information, and the voltage modulation signal finally output by the wind power converter is obtained. Through the control process of voltage source wind power converter, the system can optimize the grid-connected characteristics of traditional wind power converters, solve the problems of poor grid-connected adaptability of traditional wind power converters in low short-circuit ratio and weak AC systems, weak grid support capability of traditional wind power converters in the event of grid failure, and difficulty in verifying simulation control strategies of traditional wind power converters, thereby achieving the purpose of quickly adapting to the needs of new energy grid connection, and realizing the purpose of using wind power converters to respond to various working conditions of the power grid in a timely manner.

[0042] The optional implementation modes of the embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above implementation modes. Within the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical scheme of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.

[0043] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0044] Those skilled in the art can understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including a number of instructions to enable a single-chip microcomputer, a chip or a processor to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0045] In addition, various implementation modes of the embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed by the embodiments of the present invention.

Claims

1. A control method for a voltage source wind power converter, characterized in that: The method is performed by a controller of a wind power converter, the wind power converter being connected to a power grid, and comprises: Based on the pre-built grid-side simulation model of the wind power converter, determine the voltage modulation signal that the wind power converter will eventually output, including: S110: collecting analog signals based on a pre-built grid-side simulation model of a wind power converter; S120: determining whether the analog signal meets the power control requirement information of the power grid; if the analog signal does not meet the power control requirement information of the power grid, determining the voltage amplitude requirement data according to the power control requirement information of the power grid and the analog signal; S130: based on the voltage source wind power converter control strategy and the voltage amplitude requirement data, modulate the voltage used to control the power grid to obtain a voltage modulation signal; S140: Transmit the voltage modulation signal to the grid-side simulation model of the wind power converter to update the grid data, and receive the new analog signal fed back by the grid-side simulation model of the wind power converter after the grid data update as the collected analog signal, and repeat S120 to S140 until the analog signal meets the grid power control requirement information, and obtain the voltage modulation signal finally output by the wind power converter.

2. The control method of the voltage source wind power converter according to claim 1, characterized in that: The step of judging whether the analog signal satisfies the power grid power control requirement information includes: Based on the analog signal, calculate the real-time power output of the current wind power converter; Generate a voltage angle and a voltage amplitude for controlling the power grid according to the power control demand information of the power grid and the real-time power currently output by the wind power converter; Calculate the electrical signal data of the current wind power converter according to the analog signal and the voltage angle output by the current wind power converter; The voltage angle and voltage amplitude used to control the power grid and the electrical signal data of the current wind power converter are compared, and based on the comparison result, it is determined whether the analog signal meets the power control requirement information of the power grid.

3. The control method of the voltage source wind power converter according to claim 2, characterized in that: Determining the voltage amplitude requirement data according to the power grid power control requirement information and the analog signal includes: Based on the comparison result, voltage amplitude requirement data is generated by a PI regulator; wherein the voltage amplitude requirement data represents the active voltage amplitude data and reactive voltage amplitude data that the wind power converter needs to output.

4. The control method of the voltage source wind power converter according to claim 2, characterized in that: The real-time power currently output by the wind power converter includes active power and reactive power currently output by the wind power converter.

5. The control method of the voltage source wind power converter according to claim 2, characterized in that: The rules of the voltage source wind power converter control strategy include: Calculating a grid voltage vector for controlling the grid based on the voltage amplitude demand data and a voltage angle for controlling the grid; When a virtual resistive device is provided on the grid side, the voltage drop generated by the virtual resistive device is integrated and changed with a grid voltage vector for controlling the grid to obtain a voltage modulation signal.

6. The control method of the voltage source wind power converter according to claim 1, characterized in that: The construction rules of the wind power converter grid-side simulation model include: Based on the grid-side circuit information of the wind power converter to be simulated, the grid-side simulation model of the wind power converter is built using the RTLAB semi-physical simulation rules; Among them, the grid-side simulation model of the wind power converter includes one or more of a grid simulation model under normal operating conditions, a low voltage ride-through grid simulation model, a high voltage ride-through grid simulation model, a low-high ride-through fault interlocking grid simulation model, an impedance measurement simulation model, a converter grid-side inductor device model, a converter grid-side capacitor device model, a grid-side switch device model, a charging switch device model, a DC side capacitor device model, an IGBT equivalent model, a switch model and an analog signal model.

7. The control method of the voltage source wind power converter according to claim 1, characterized in that: A data conversion board is provided between the controller of the wind power converter and the grid-side simulation model of the wind power converter; The data conversion board is used to transmit the analog signal output by the grid-side simulation model of the wind power converter to the controller of the wind power converter, and transmit the voltage modulation signal finally output by the wind power converter to the grid-side simulation model of the wind power converter.

8. A control system for a voltage source wind power converter, characterized in that: A controller applied to a wind power converter, wherein the wind power converter is connected to a power grid, and the system comprises: The voltage modulation module is used to determine the voltage modulation signal ultimately output by the wind power converter based on the pre-built grid-side simulation model of the wind power converter, including: An analog signal acquisition unit is used to acquire analog signals based on a pre-built grid-side simulation model of a wind power converter; A voltage amplitude requirement data determination unit is used to determine whether the analog signal meets the power grid power control requirement information, and if the analog signal does not meet the power grid power control requirement information, determine the voltage amplitude requirement data according to the power grid power control requirement information and the analog signal; A voltage modulation signal obtaining unit is used to modulate the voltage used to control the power grid based on the voltage source wind power converter control strategy and the voltage amplitude requirement data to obtain a voltage modulation signal; The voltage modulation signal adjustment unit is used to transmit the voltage modulation signal to the grid-side simulation model of the wind power converter to update the grid data, and receive the new analog signal fed back by the grid-side simulation model of the wind power converter after the grid data is updated as the collected analog signal, and repeatedly execute the voltage amplitude requirement data determination unit to the voltage modulation signal adjustment unit until the analog signal meets the grid power control requirement information, thereby obtaining the voltage modulation signal finally output by the wind power converter.

9. A machine-readable storage medium having instructions stored thereon, characterized in that: When the instruction is executed by a processor, the processor is configured to execute the control method of the voltage source wind power converter according to any one of claims 1 to 7.

10. An electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the control method of the voltage source wind power converter according to any one of claims 1 to 7 is implemented.

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