Active damping control method and device for passive filtering of wind power doubly-fed converter

Abstract

The embodiment of the invention discloses an active damping control method and device for passive filtering of a wind power doubly-fed converter. The method comprises the following steps: collecting power grid voltage, grid side current and capacitance current of any two phases on an LC filter capacitor; transforming to a dq coordinate system; pI adjustment is carried out on the converted grid-side current to obtain a PI output phase of the output voltage of the grid-side converter, and lead-lag processing is carried out on the converted capacitance current to obtain the feedback quantity of the capacitance current; obtaining a decoupling item according to the transformed grid-side current, taking the transformed grid voltage as a grid voltage feed-forward item, and obtaining an instruction voltage output by the grid-side converter in combination with a feedback quantity and a PI output phase; and carrying out space vector pulse width modulation on the instruction voltage and then controlling on and off of a grid-side converter switching tube. By means of the mode, the resonance problem caused by the LC filter can be effectively restrained, and the reliability and stability of the grid-side converter of the wind power doubly-fed converter are improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of renewable energy power generation, and in particular to an active damping control method and device for passive filtering of a wind power doubly-fed converter. Background Art

[0002] In recent years, the utilization rate of renewable energy has been increasing year by year, especially wind power generation, which has been the fastest in the world. The maturity of wind power technology and the emergence of economies of scale have led to a continuous decline in the price of wind turbines, which has led to a continuous reduction in wind power costs, greatly stimulating the rapid development of localization of wind power equipment. The grid-side rectifier of the wind power converter plays a key role in the conversion of AC and DC power in the wind power generation system and is the core equipment for the grid-connected operation of the wind power generation system.

[0003] The harmonic suppression problem of grid-side current in grid-connected systems has been a research hotspot in recent years. LCL filters can effectively filter out high-order current harmonics generated by pulse width modulation (PWM) converters, but their high-order characteristics cause undamped resonance in the grid-connected current, endangering the safety and stable operation of the grid-connected system, and placing high demands on closed-loop design. In order to overcome the underdamped or even undamped characteristics of the system and achieve better system stability, a large number of studies have been conducted on technologies that suppress resonance peaks using passive or active damping. In the passive damping scheme, the damping characteristics of the system are improved by connecting resistors in series or in parallel in the filter. This scheme is simple and reliable, but the large additional loss restricts its application. The active damping scheme achieves the same resonance peak suppression effect as the passive scheme by adding additional feedback control. This method does not bring about unnecessary losses, and research on this scheme has been a hot topic in recent years. However, due to the power coupling relationship between the AC and DC sides of the converter, when a grid fault occurs, the DC side capacitor voltage of the converter will fluctuate, which may easily cause the power devices of the converter to leave the safe working area, which is not conducive to the stable operation of the grid-side converter. Summary of the invention

[0004] In view of the above problems, an embodiment of the present invention provides a method and device for active damping control of passive filtering of a wind power doubly-fed converter, which overcomes the above problems or at least partially solves the above problems.

[0005] According to one aspect of an embodiment of the present invention, there is provided an active damping control method for passive filtering of a wind power doubly-fed converter, the method comprising: collecting grid voltage, grid-side current and capacitor currents of any two phases on an LC filter capacitor; performing coordinate transformation of the collected grid voltage, grid-side current and capacitor currents of any two phases on an LC filter capacitor to a dq coordinate system; performing PI regulation on the transformed grid-side current to obtain a PI output phase of a grid-side converter output voltage, and performing lead-lag processing on the transformed capacitor current to obtain a feedback amount of the capacitor current; obtaining a decoupling item according to the transformed grid-side current, using the transformed grid voltage as a grid voltage feedforward item, and combining the feedback amount of the capacitor current and the PI output phase of the grid-side converter output voltage to obtain a command voltage output by the grid-side converter; and controlling the on and off of a switch tube of the grid-side converter after space vector pulse width modulation on the command voltage.

[0006] Optionally, the coordinate transformation of the collected grid voltage, the grid-side current and the capacitor current of any two phases on the LC filter capacitor into a dq coordinate system includes: calculating the capacitor current of any two phases on the collected LC filter capacitor to obtain the capacitor current of the third phase; performing dq coordinate transformation on the grid voltage, the grid-side current and the three-phase capacitor current respectively to obtain the grid voltage, grid-side current and capacitor current in the dq coordinate system.

[0007] Optionally, before performing PI adjustment on the transformed grid-side current to obtain the PI output phase of the grid-side converter output voltage, it includes: collecting the DC bus voltage; calculating the difference between the DC bus voltage and the DC bus voltage command value, and performing PI adjustment to obtain the d-axis grid-side current command value.

[0008] Optionally, the PI adjustment of the transformed grid-side current to obtain the PI output phase of the grid-side converter output voltage includes: calculating the difference between the transformed grid-side current and the dq-axis grid-side current command value, and performing PI adjustment to obtain the PI output phase of the grid-side converter output voltage.

[0009] Optionally, the step of performing lead-lag processing on the transformed capacitor current to obtain the feedback amount of the capacitor current includes: performing lead-lag processing on the transformed capacitor current using a lead-lag loop to obtain the feedback amount of the capacitor current, wherein the transfer function of the lead-lag loop is:

[0010]

[0011] Wherein, Z represents the complex frequency domain, and k is the active damping control coefficient of the grid-side converter.

[0012] Optionally, the decoupling term is obtained according to the transformed grid-side current, the transformed grid voltage is used as the grid voltage feedforward term, and the command voltage output by the grid-side converter is obtained by combining the feedback amount of the capacitor current and the PI output phase of the grid-side converter output voltage, including: multiplying the transformed grid-side current by The decoupling term is obtained, where is the resonant inductor, L is the filter inductance value of the grid-side converter; the transformed grid voltage is used as the grid voltage feedforward term; the PI output phase of the grid-side converter output voltage is summed with the grid voltage feedforward term, the feedback amount of the capacitor current and the decoupling term to obtain the command voltage of the grid-side converter output in the dq coordinate system.

[0013] Optionally, the control of on and off of the switch tube of the grid-side converter after performing space vector pulse width modulation on the command voltage includes: performing coordinate transformation on the command voltage in the dq coordinate system to obtain a three-phase command voltage of the grid-side converter; performing space vector pulse width modulation on the three-phase command voltage using a space vector pulse width modulator to obtain a duty cycle of the IGBT switch tube in the grid-side converter; and controlling the on and off of each IGBT switch tube in the grid-side converter according to the duty cycle.

[0014] Based on the same inventive concept, an active damping control device for passive filtering of a wind power doubly-fed converter is provided, comprising: a data acquisition unit, used to acquire grid voltage, grid-side current and any two-phase capacitor current on an LC filter capacitor; a coordinate transformation unit, used to transform the acquired grid voltage, grid-side current and any two-phase capacitor current on an LC filter capacitor into a dq coordinate system; a data processing unit, used to perform PI regulation on the transformed grid-side current to obtain the PI output phase of the grid-side converter output voltage, and perform lead-lag processing on the transformed capacitor current to obtain the feedback amount of the capacitor current; a command voltage acquisition unit, used to acquire a decoupling item according to the transformed grid-side current, use the transformed grid voltage as a grid voltage feedforward item, and combine the feedback amount of the capacitor current and the PI output phase of the grid-side converter output voltage to obtain the command voltage output by the grid-side converter; and a switch control unit, used to perform space vector pulse width modulation on the command voltage to control the on and off of the switch tube of the grid-side converter.

[0015] Based on the same inventive concept, an embodiment of the present invention further proposes an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the aforementioned method when executing the program.

[0016] Based on the same inventive concept, an embodiment of the present invention further proposes a computer storage medium, in which at least one executable instruction is stored, and the executable instruction enables a processor to execute the aforementioned method.

[0017] The embodiment of the present invention collects grid voltage, grid-side current and capacitor current of any two phases on the LC filter capacitor; transforms the collected grid voltage, grid-side current and capacitor current of any two phases on the LC filter capacitor into a dq coordinate system; performs PI adjustment on the transformed grid-side current to obtain the PI output phase of the grid-side converter output voltage, and performs lead-lag processing on the transformed capacitor current to obtain the feedback amount of the capacitor current; obtains a decoupling item according to the transformed grid-side current, uses the transformed grid voltage as a grid voltage feedforward item, and combines the feedback amount of the capacitor current and the PI output phase of the grid-side converter output voltage to obtain the command voltage output by the grid-side converter; performs space vector pulse width modulation on the command voltage to control the on and off of the grid-side converter switch tube, which can effectively suppress the resonance problem caused by the LC filter and improve the reliability and stability of the grid-side converter of the wind power double-fed converter.

[0018] The above description is only an overview of the technical solution of the embodiment of the present invention. In order to more clearly understand the technical means of the embodiment of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0020] Figure 1 A schematic flow chart of an active damping control method for passive filtering of a wind power doubly-fed converter provided by an embodiment of the present invention is shown;

[0021] Figure 2 A schematic diagram of the connection topology of a grid-side converter provided in an embodiment of the present invention is shown;

[0022] Figure 3 A schematic diagram of a lead-lag loop provided by an embodiment of the present invention is shown;

[0023] Figure 4 A schematic diagram of a grid-side converter control process provided by an embodiment of the present invention is shown;

[0024] Figure 5 A schematic diagram showing the effect of the active damping control method for passive filtering of a wind power doubly-fed converter provided by an embodiment of the present invention is shown;

[0025] Figure 6A schematic structural diagram of an active damping control device for passive filtering of a wind power doubly-fed converter provided in an embodiment of the present invention is shown;

[0026] Figure 7 A schematic diagram of an electronic device in an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0027] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0028] Figure 1 The figure shows a flow chart of an active damping control method for passive filtering of a wind power double-fed converter provided by an embodiment of the present invention. Figure 1 As shown, the active damping control method of the passive filter of the wind power double-fed converter is applied to the controller, including:

[0029] Step S11: collecting the grid voltage, grid-side current and the capacitor current of any two phases on the LC filter capacitor.

[0030] The wind power doubly-fed converter includes a grid-side converter, an LC filter circuit, an A / D sampling circuit, a phase-locked loop circuit, a control DCU unit, and a drive protection circuit. The grid-side converter has both a rectifier and an inverter function. The above-mentioned LC filter is connected to the rectifier circuit (i.e., the grid-side converter) and the grid; the input end of the phase-locked loop circuit is connected to the grid; the drive protection circuit is connected to the rectifier circuit; and the A / D sampling current is connected to the grid and the rectifier circuit. The connection topology of the grid-side converter is as follows: Figure 2 As shown, the grid-side converter includes IGBT tubes VT1, VT2, VT3, VT4, VT5, and VT6, a total of 6 switch tubes. In the embodiment of the present invention, in each sampling period, an A / D sampling circuit is used to sample the grid voltage U a , U b , U c , grid-side current I a ,I b ,I c , and the A and B phase capacitor currents ic on the LC filter capacitor a ,ic b The samples are respectively sampled and the sampled data are sent to the control DCU unit for processing. The control DCU unit is the aforementioned controller.

[0031] Step S12: performing coordinate transformation on the collected grid voltage, the grid-side current and the capacitor currents of any two phases on the LC filter capacitor into a dq coordinate system.

[0032] In step S12, the capacitor currents of any two phases on the collected LC filter capacitor are calculated to obtain the capacitor current of the third phase. For example, the capacitor currents of phases A and B of the collected LC filter capacitor current ic a ,ic b , the current ic of capacitor C phase c , ic c =-ic a -ic b Then, the grid voltage, the grid-side current and the three-phase capacitor current are transformed into dq coordinates to obtain the grid voltage U in the dq coordinate system. d and U q , grid-side current I d and I q , and capacitor current ic d and ic q .

[0033] Step S13: performing PI adjustment on the transformed grid-side current to obtain the PI output phase of the grid-side converter output voltage, and performing lead-lag processing on the transformed capacitor current to obtain the feedback amount of the capacitor current.

[0034] In the embodiment of the present invention, optionally, before the transformed grid-side current is PI-regulated, the DC bus voltage is collected. Specifically, an A / D sampling circuit is used to collect the DC bus voltage U dc Then the DC bus voltage U dc and DC bus voltage command value U dcref Calculate the difference and perform PI adjustment to obtain the d-axis grid-side current command value I * d .

[0035] In step S13, the transformed grid-side current I d ,I q The current command value I of the dq axis grid side * d ,I * q The difference is calculated and PI adjustment is performed to obtain the PI output phase ΔU of the grid-side converter output voltage. d , ΔU q . The q-axis grid-side current command value I * q It is the command current output by the direct DC voltage loop.

[0036] The embodiment of the present invention applies a lead-lag loop to perform lead-lag processing on the transformed capacitor current to obtain the feedback amount of the capacitor current. Figure 3 As shown, abc / dq represents the coordinate transformation from the A, B, C three-phase coordinate system to the dq coordinate system. The transfer function of the lead-lag loop in the time domain is The transfer function of the lead-lag loop in the discrete domain is obtained by discretization using backward difference:

[0037]

[0038] Wherein, Z represents the complex frequency domain, and k is the active damping control coefficient of the grid-side converter.

[0039] Step S14: obtaining a decoupling term according to the transformed grid-side current, using the transformed grid voltage as a grid voltage feedforward term, and combining the feedback of the capacitor current and the PI output phase of the grid-side converter output voltage to obtain a command voltage output by the grid-side converter.

[0040] Optionally, the transformed grid-side current I d ,I q Multiply Get the decoupling term in, is the resonant inductor, L is the filter inductor value of the grid-side converter; the transformed grid voltage U d , U q As the grid voltage feedforward term; the PI output phase ΔU of the grid-side converter output voltage d , ΔU q With the grid voltage feedforward term U d , U q , the feedback amount Δic of the capacitor current d , Δic q And the decoupling term Sum and get the command voltage U in the dq coordinate system output by the grid-side converter * d , U * q .

[0041] Step S15: performing space vector pulse width modulation on the command voltage to control the on and off of the switch tube of the grid-side converter.

[0042] The command voltage U in the dq coordinate system * d , U * qCoordinate transformation is performed to obtain a three-phase command voltage of a grid-side converter; a space vector pulse width modulator (SVPWM) is used to perform space vector pulse width modulation on the three-phase command voltage to obtain a duty cycle of an IGBT switch tube in the grid-side converter; and the on and off of each IGBT switch tube in the grid-side converter is controlled according to the duty cycle.

[0043] The entire grid-side converter is controlled as follows Figure 4 As shown, the complete process is as follows:

[0044] 1. In each sampling cycle, the A / D sampling circuit samples the grid voltage U a , U b , U c , grid-side current I a ,I b ,I c , DC bus voltage U dc And the A and B phase capacitor currents ic on the LC filter capacitor a ,ic b Sampling is performed respectively, and the sampled data is sent to the control DCU unit for processing;

[0045] 2. The actual value of the DC bus voltage U dc and DC bus voltage command value U dcref Perform PI adjustment to obtain the active power command value I of the grid-side current * d ;

[0046] 3. Capacitor current ic of phases A and B of LC filter capacitor current a ,ic b Calculate and get the current ic of capacitor C phase c ;

[0047] 4. Three-phase capacitor current ic on the capacitor of LC filter a ,ic b ,ic c Perform dq axis synchronous coordinate system transformation to obtain ic d and ic q ;

[0048] 5. IC d and ic q Perform lead-lag link processing to obtain the capacitor current feedback Δic d and Δic q , and then the feedback amount Δic d and Δic q The output command voltage U fed back to the grid-side converter *d and U * q ;

[0049] 6. Three-phase grid-side current I a ,I b ,I c Perform dq axis synchronous coordinate transformation to obtain I d and I q , and then with the grid-side current command value I * d and I * q Perform PI regulation to obtain the PI output phase ΔU of the grid-side converter output voltage d and ΔU q ;

[0050] 7. Set the grid voltage U a , U b , U c Perform dq axis synchronous coordinate system transformation to obtain U d and U q The dq axis component of is used as the grid pressure feedforward item;

[0051] 8. Introduction and As a decoupling term;

[0052] 9. From the feedback amount Δic d and Δix q , PI output phase ΔU d and ΔU q , grid voltage feedforward term and decoupling term to obtain the command voltage U output by the grid-side converter * d and U * q ;

[0053] 10. Command voltage U for grid-side converter * d and U * q The three-phase command voltage of the grid-side converter is obtained by coordinate transformation, and the duty cycle of the IGBT switch tube is obtained through SVPWM modulation. The on and off of the grid-side converter switch tube is controlled through the driving protection circuit.

[0054] The grid-side converter is responsible for the A and B phase capacitor currents on the LC filter capacitor. a ,ic b The samples are taken separately, and then the capacitor C phase current ic is obtained by calculation. c , through the three-phase current ic to the capacitor a ,ic b ,icc The effective value of the three-phase current is calculated. When the instantaneous value and effective value of the capacitor three-phase current are found to be abnormal, the fault protection function is used to protect the grid-side converter to avoid damage to the filter capacitor components.

[0055] Figure 5 The effect of the active damping control method for passive filtering of a wind power double-fed converter provided by an embodiment of the present invention is shown. Among them, Figure a is the current of the LC filter module, that is, the capacitor current, Figure b is the DC voltage, Figure c is the grid voltage with active damping control using the active damping control method for passive filtering of a wind power double-fed converter according to an embodiment of the present invention, and Figure d is the grid voltage without active damping control. A harmonic with a 20th frequency multiplication and an amplitude of 1% is injected at 1s, from Figure 5 It can be seen that after the active damping control method of the passive filter of the wind power doubly fed converter according to the embodiment of the present invention is used for active damping control, the harmonic content of the grid voltage is significantly reduced at 1s compared with the grid voltage without active damping control, indicating that the active damping control method of the passive filter of the wind power doubly fed converter according to the embodiment of the present invention has an obvious harmonic suppression function and is friendly to the grid voltage. Therefore, the active damping control method of the passive filter of the wind power doubly fed converter according to the embodiment of the present invention can effectively suppress resonance, enable the normal operation of the wind power converter, and reduce the harmonic content of the grid voltage, and has good robustness and dynamic and static performance. At the same time, the control algorithm has a wide range of adaptability, is easy to engineer, and has great practical value; and can protect the components of the filter capacitor, which improves the reliability and stability of the grid-side converter of the wind power doubly fed converter.

[0056] The active damping control method for passive filtering of a wind power doubly-fed converter in an embodiment of the present invention utilizes an existing doubly-fed wind turbine generator set, a grid-side converter, and a capacitor current sensor. By detecting two-phase currents of the capacitor current, the other-phase capacitor current is calculated, and a capacitor current feedback control method is adopted. This can effectively suppress the resonance problem caused by the LC filter and improve the stability and reliability of the system.

[0057] In summary, the active damping control method for passive filtering of a wind power doubly-fed converter according to an embodiment of the present invention collects grid voltage, grid-side current and capacitor current of any two phases on the LC filter capacitor; transforms the collected grid voltage, grid-side current and capacitor current of any two phases on the LC filter capacitor into a dq coordinate system; performs PI adjustment on the transformed grid-side current to obtain the PI output phase of the grid-side converter output voltage, and performs lead-lag processing on the transformed capacitor current to obtain the feedback amount of the capacitor current; obtains a decoupling item according to the transformed grid-side current, uses the transformed grid voltage as a grid voltage feedforward item, and combines the feedback amount of the capacitor current and the PI output phase of the grid-side converter output voltage to obtain the command voltage output by the grid-side converter; performs space vector pulse width modulation on the command voltage to control the on and off of the grid-side converter switch tube, which can effectively suppress the resonance problem caused by the LC filter and improve the reliability and stability of the grid-side converter of the wind power doubly-fed converter.

[0058] The above specific embodiments of the present invention are described. In some cases, the actions or steps recorded in the embodiments of the present invention can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the process depicted in the accompanying drawings does not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0059] Based on the same concept, an embodiment of the present invention also provides an active damping control device for passive filtering of a wind power double-fed converter. Applicable to a controller. Figure 6 As shown, the active damping control device for passive filtering of a wind power double-fed converter includes: a data acquisition unit, a coordinate transformation unit, a data processing unit, a command voltage acquisition unit, and a start tube control unit.

[0060] A data acquisition unit is used to collect grid voltage, grid-side current and any two-phase capacitance current on the LC filter capacitor;

[0061] A coordinate transformation unit, used for transforming the collected grid voltage, grid-side current and any two-phase capacitor current on the LC filter capacitor into a dq coordinate system;

[0062] A data processing unit is used to perform PI regulation on the transformed grid-side current to obtain the PI output phase of the grid-side converter output voltage, and to perform lead-lag processing on the transformed capacitor current to obtain the feedback amount of the capacitor current;

[0063] A command voltage acquisition unit is used to acquire a decoupling term according to the transformed grid-side current, and the transformed grid voltage is used as a grid voltage feedforward term, and the command voltage output by the grid-side converter is obtained by combining the feedback amount of the capacitor current and the PI output phase of the grid-side converter output voltage;

[0064] The switch control unit is used to control the on and off of the switch tube of the grid-side converter after performing space vector pulse width modulation on the command voltage.

[0065] For the convenience of description, the above device is described as various modules according to their functions. Of course, when implementing the embodiment of the present invention, the functions of each module can be implemented in the same or multiple software and / or hardware.

[0066] The device of the above embodiment is applied to the corresponding method in the above embodiment, and has the beneficial effects of the corresponding method embodiment, which will not be described in detail here.

[0067] Based on the same inventive concept, an embodiment of the present invention further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the method described in any one of the above embodiments is implemented.

[0068] An embodiment of the present invention provides a non-volatile computer storage medium, wherein the computer storage medium stores at least one executable instruction, and the computer executable instruction can execute the method described in any of the above embodiments.

[0069] Figure 7 A more specific schematic diagram of the hardware structure of an electronic device provided in this embodiment is shown, and the device may include: a processor 701, a memory 702, an input / output interface 703, a communication interface 704, and a bus 705. The processor 701, the memory 702, the input / output interface 703, and the communication interface 704 are connected to each other in communication within the device through the bus 705.

[0070] The processor 701 can be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solution provided by the method embodiment of the present invention.

[0071] The memory 702 can be implemented in the form of ROM (Read Only Memory), RAM (Random Access Memory), static storage device, dynamic storage device, etc. The memory 702 can store an operating system and other application programs. When the technical solution provided by the method embodiment of the present invention is implemented by software or firmware, the relevant program code is stored in the memory 702 and called and executed by the processor 701.

[0072] The input / output interface 703 is used to connect the input / output module to realize information input and output. The input / output module can be configured in the device as a component (not shown in the figure), or it can be externally connected to the device to provide corresponding functions. The input device may include a keyboard, a mouse, a touch screen, a microphone, various sensors, etc., and the output device may include a display, a speaker, a vibrator, an indicator light, etc.

[0073] The communication interface 704 is used to connect a communication module (not shown) to realize communication interaction between the device and other devices. The communication module can realize communication through a wired mode (such as USB, network cable, etc.) or a wireless mode (such as mobile network, WIFI, Bluetooth, etc.).

[0074] The bus 705 includes a path for transmitting information between various components of the device (eg, the processor 701 , the memory 702 , the input / output interface 703 , and the communication interface 704 ).

[0075] It should be noted that, although the above device only shows the processor 701, the memory 702, the input / output interface 703, the communication interface 704 and the bus 705, in the specific implementation process, the device may also include other components necessary for normal operation. In addition, it can be understood by those skilled in the art that the above device may also only include the components necessary for implementing the embodiment of the present invention, and does not necessarily include all the components shown in the figure.

[0076] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present disclosure is limited to these examples. Based on the concept of the present disclosure, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0077] This application is intended to cover all such substitutions, modifications and variations that fall within the broad scope of all embodiments. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included in the scope of protection of this disclosure.

Claims

1. An active damping control method for passive filtering of a wind power doubly-fed converter, characterized in that: The method comprises: Collect grid voltage, grid-side current and any two-phase capacitance current on LC filter capacitor; Transforming the collected grid voltage, grid-side current and any two-phase capacitance current on the LC filter capacitor into a dq coordinate system; The transformed grid-side current is PI-regulated to obtain the PI output phase of the grid-side converter output voltage, and the transformed capacitor current is lead-lag processed to obtain the feedback amount of the capacitor current; A decoupling term is obtained according to the transformed grid-side current, and the transformed grid voltage is used as a grid voltage feedforward term, and a command voltage output by the grid-side converter is obtained by combining the feedback amount of the capacitor current and the PI output phase of the grid-side converter output voltage; The command voltage is subjected to space vector pulse width modulation to control the on and off of the switch tube of the grid-side converter.

2. The method according to claim 1, characterized in that The step of transforming the collected grid voltage, grid-side current, and any two-phase capacitor currents on the LC filter capacitor into a dq coordinate system includes: The capacitor current of any two phases on the collected LC filter capacitor is calculated to obtain the capacitor current of the third phase; The grid voltage, the grid-side current and the three-phase capacitor current are respectively transformed into dq coordinates to obtain the grid voltage, the grid-side current and the capacitor current in the dq coordinate system.

3. The method according to claim 1, characterized in that Before the PI output phase of the grid-side converter output voltage is obtained by PI regulation of the transformed grid-side current, the method includes: Collect DC bus voltage; The difference between the DC bus voltage and the DC bus voltage command value is calculated, and PI adjustment is performed to obtain the d-axis grid-side current command value.

4. The method according to claim 1, characterized in that The step of performing PI regulation on the transformed grid-side current to obtain the PI output phase of the grid-side converter output voltage includes: The difference between the transformed grid-side current and the dq-axis grid-side current command value is calculated, and PI adjustment is performed to obtain the PI output phase of the grid-side converter output voltage.

5. The method according to claim 1, characterized in that The step of performing lead-lag processing on the transformed capacitor current to obtain a feedback amount of the capacitor current includes: The lead-lag loop is applied to perform lead-lag processing on the transformed capacitor current to obtain the feedback amount of the capacitor current. The transfer function of the lead-lag loop is: Wherein, Z represents the complex frequency domain, and k is the active damping control coefficient of the grid-side converter.

6. The method according to claim 1, characterized in that The decoupling term is obtained according to the transformed grid-side current, the transformed grid voltage is used as a grid voltage feedforward term, and the command voltage output by the grid-side converter is obtained by combining the feedback amount of the capacitor current and the PI output phase of the grid-side converter output voltage, including: Multiply the transformed grid-side current by The decoupling term is obtained, where is the resonant inductance, L is the filter inductance value of the grid-side converter; The transformed grid voltage is used as a grid voltage feedforward item; The PI output phase of the grid-side converter output voltage is summed with the grid voltage feedforward term, the feedback amount of the capacitor current and the decoupling term to obtain the command voltage of the grid-side converter output in the dq coordinate system.

7. The method according to claim 1, characterized in that The method of performing space vector pulse width modulation on the command voltage to control the on and off of the switch tube of the grid-side converter comprises: Perform coordinate transformation on the command voltage in the dq coordinate system to obtain the three-phase command voltage of the grid-side converter; Applying a space vector pulse width modulator to perform space vector pulse width modulation on the three-phase command voltage to obtain a duty cycle of an IGBT switch tube in a grid-side converter; The on and off of each IGBT switch tube in the grid-side converter is controlled according to the duty cycle.

8. An active damping control device for passive filtering of a wind power double-fed converter, characterized in that: The device comprises: A data acquisition unit is used to collect grid voltage, grid-side current and any two-phase capacitance current on the LC filter capacitor; A coordinate transformation unit, used for transforming the collected grid voltage, grid-side current and any two-phase capacitor current on the LC filter capacitor into a dq coordinate system; A data processing unit is used to perform PI regulation on the transformed grid-side current to obtain the PI output phase of the grid-side converter output voltage, and to perform lead-lag processing on the transformed capacitor current to obtain the feedback amount of the capacitor current; A command voltage acquisition unit is used to acquire a decoupling term according to the transformed grid-side current, and the transformed grid voltage is used as a grid voltage feedforward term, and the command voltage output by the grid-side converter is obtained by combining the feedback amount of the capacitor current and the PI output phase of the grid-side converter output voltage; The switch control unit is used to control the on and off of the switch tube of the grid-side converter after performing space vector pulse width modulation on the command voltage.

9. 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 program, the method according to any one of claims 1 to 7 is implemented.

10. A computer storage medium, characterized in that: The storage medium stores at least one executable instruction, and the executable instruction enables the processor to execute the method according to any one of claims 1 to 7.

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