Control method of inverter module and wind power conversion device

Abstract

The application provides a control method of an inverter module and a wind power conversion device. The diode rectifier arranged in the wind power conversion device can improve the reliability of the rectifier, reduce the cost, and reduce the damage speed of the stator winding insulation of the generator. The six-phase permanent magnet synchronous generator can improve the operation efficiency of the system. The double-stator winding structure with a phase difference of 30 degrees between back electromotive forces is combined with the diode rectifier, and the phase-shifting transformer is connected in parallel between the filter inductor assembly and the diode rectifier, so that the fifth and seventh harmonic currents on the generator side can be eliminated, and the waveform quality of the alternating current on the generator side is optimized. The current source type inverter module is connected after the diode rectifier to obtain three-phase alternating current, and the three-phase alternating current is input into the power grid through the step-up transformer, so that the power generation benefit under the low wind speed condition can be improved, and the power generation can be connected to the grid in a wide speed range.

Description

Technical Field

[0001] This application relates to, but is not limited to, the field of wind power generation, and particularly to a control method for an inverter module and a wind power conversion device. Background Technology

[0002] Due to limitations in large gearbox manufacturing technology, semi-direct-drive or direct-drive permanent magnet synchronous generators (PMSGs) are gradually becoming the mainstream solution for offshore wind power. In related technologies, most commercial wind power conversion devices based on PMSGs employ back-to-back PWM (Pulse Width Modulation) rectifier / inverter voltage source converters with two-level or three-level topologies. To increase converter capacity and improve system reliability, most mainstream vendors use a parallel configuration of multiple converters. However, since wind turbines do not need to draw active power from the grid, the bidirectional power function of the AC / DC PWM rectifier connected to the wind turbine input is of little use in the wind power system. Moreover, compared to diode-controlled rectifiers, PWM rectifiers are more expensive and have lower operating efficiency and reliability. Furthermore, the higher voltage change rate of PWM rectifiers accelerates the damage to the generator's stator winding insulation. However, if the generator output is directly connected to a traditional three-phase full-bridge six-pulse diode rectifier, the quality of the AC current waveform on the generator side is reduced, resulting in insufficient DC voltage after rectification. This prevents the wind turbine from operating over a wide speed range, thus reducing power generation efficiency under low to medium wind speed conditions. While using a three-phase full-bridge six-pulse diode rectifier followed by a DC-DC boost converter can solve the problem of insufficient DC voltage, this approach significantly reduces system efficiency and reliability. Summary of the Invention

[0003] This application provides a control method for an inverter module and a wind power conversion device, which can achieve advantages such as low cost, high operating efficiency, high reliability, and high power quality. At the same time, it can reduce the damage rate of the generator stator winding insulation and improve the power generation efficiency under medium and low wind speed conditions, thereby realizing the function of grid-connected power generation over a wide speed range.

[0004] In a first aspect, embodiments of this application provide a wind power conversion device, comprising:

[0005] Fan;

[0006] Step-up transformer;

[0007] A six-phase permanent magnet synchronous generator includes dual stator windings, a rotor, and a filter inductor assembly. The back electromotive force phase difference of the dual stator windings is 30°. The rotor is connected to the wind turbine, and the dual stator windings are connected to the filter inductor assembly.

[0008] A diode rectifier is connected to the filter inductor assembly;

[0009] A phase-shifting transformer is connected in parallel between the filter inductor assembly and the diode rectifier;

[0010] A current source inverter module is connected to the diode rectifier and the step-up transformer respectively. The current source inverter module is used to receive the DC-side inductor current and DC bus voltage from the diode rectifier, obtain three-phase AC power based on the DC-side inductor current and DC bus voltage, and input the three-phase AC power to the power grid through the step-up transformer.

[0011] Optionally, in one embodiment of this application, the current source inverter module includes a first current source inverter and a second current source inverter. Both the first current source inverter and the second current source inverter include a DC side and an AC side. The DC side of the first current source inverter and the DC side of the second current source inverter are both connected to the diode rectifier. The AC side of the first current source inverter and the AC side of the second current source inverter are connected in parallel to the step-up transformer.

[0012] Optionally, in one embodiment of this application, the first current source inverter further includes a first power semiconductor unit. The DC side of the first current source inverter includes a first DC inductor, and the AC side of the first current source inverter includes a first filter, a second filter, and a third filter. The first power semiconductor unit is connected to the first DC inductor, the first filter, the second filter, and the third filter, respectively. The first DC inductor is connected to the diode rectifier, and the first filter, the second filter, and the third filter are all connected to the step-up transformer.

[0013] Optionally, in one embodiment of this application, the first power semiconductor unit includes a first switching component, a second switching component, a third switching component, a fourth switching component, a fifth switching component, a sixth switching component, a first bridge arm, a second bridge arm, and a third bridge arm. The first switching component and the second switching component are connected in series through the first bridge arm to form a first branch. The third switching component and the fourth switching component are connected in series through the second bridge arm to form a second branch. The fifth switching component and the sixth switching component are connected in series through the third bridge arm to form a third branch. The first connection terminal of the first branch, the second connection terminal of the second branch, and the third connection terminal of the third branch are connected in parallel to the DC inductor. The fourth connection terminal of the first branch, the fifth connection terminal of the second branch, and the sixth connection terminal of the third branch are connected in parallel to the diode rectifier. The first filter is connected to the first bridge arm, the second filter is connected to the second bridge arm, and the third filter is connected to the third bridge arm.

[0014] Optionally, in one embodiment of this application, the second current source inverter further includes a second power semiconductor unit. The DC side of the second current source inverter includes a second DC inductor, and the AC side of the second current source inverter includes a fourth filter, a fifth filter, and a sixth filter. The second power semiconductor unit is connected to the second DC inductor, the fourth filter, the fifth filter, and the sixth filter, respectively. The second DC inductor is connected to the diode rectifier, and the fourth filter, the fifth filter, and the sixth filter are all connected to the step-up transformer.

[0015] Optionally, in one embodiment of this application, the second power semiconductor unit includes a seventh switch assembly, an eighth switch assembly, a ninth switch assembly, a tenth switch assembly, an eleventh switch assembly, a twelfth switch assembly, a fourth bridge arm, a fifth bridge arm, and a sixth bridge arm. The seventh switch assembly and the eighth switch assembly are connected in series through the fourth bridge arm to form a fourth branch. The ninth switch assembly and the tenth switch assembly are connected in series through the fifth bridge arm to form a fifth branch. The eleventh switch assembly and the twelfth switch assembly are connected in series through the sixth bridge arm to form a sixth branch. The seventh connection terminal of the fourth branch, the eighth connection terminal of the fifth branch, and the ninth connection terminal of the sixth branch are connected in parallel to the DC inductor. The tenth connection terminal of the fourth branch, the eleventh connection terminal of the fifth branch, and the twelfth connection terminal of the sixth branch are connected in parallel to the diode rectifier. The fourth filter is connected to the fourth bridge arm, the fifth filter is connected to the fifth bridge arm, and the sixth filter is connected to the sixth bridge arm.

[0016] Secondly, embodiments of this application also provide a control method for an inverter module, applied to the wind power conversion device as described in the first aspect, the control method comprising:

[0017] Obtain the wind speed of the fan;

[0018] The power reference value corresponding to the wind speed is determined by the six-phase permanent magnet synchronous generator.

[0019] The reference current value is calculated based on the DC bus voltage of the diode rectifier and the power reference value.

[0020] Determine the inductor current value of the DC inductor of the current source inverter module, and obtain the first current component based on the difference between the reference current value and the inductor current value;

[0021] Determine the second current component and the voltage phase angle of the power grid, and obtain the modulation ratio based on the first current component, the second current component, the voltage phase angle, and the inductor current value;

[0022] The current source inverter module is controlled according to the modulation ratio.

[0023] Thirdly, embodiments of this application also provide a wind power conversion device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the control method described in the second aspect above.

[0024] Fourthly, embodiments of this application also provide a computer-readable storage medium storing computer-executable instructions for performing the control method described in the second aspect above.

[0025] This application's embodiments include: Compared to setting a PWM rectifier in the wind power conversion device, setting a diode rectifier in the wind power conversion device can improve the reliability of the rectifier, avoid the high cost of PWM rectifiers and the waste of bidirectional power function of AC / DC PWM rectifiers connected to the input of wind turbines in related technologies, and avoid the risk of damage to the stator winding insulation of the motor due to the high voltage change rate of PWM rectifiers, thereby reducing the damage rate of the generator's stator winding insulation and thus reducing the maintenance cost of the generator; by setting a six-phase permanent magnet synchronous generator in the wind power conversion device, the system's operating efficiency can be improved; and by combining the double stator winding structure of the six-phase permanent magnet synchronous generator with a 30° phase difference in back electromotive force with a diode rectifier, the 5th and 7th harmonic currents on the generator side can be eliminated, avoiding the severe AC current caused by uncontrolled diode rectification. To address the issue of severe distortion, a phase-shifting transformer absorbs most of the 5th and 7th harmonic currents on the rectifier side, optimizing the waveform quality of the AC current on the generator side. Furthermore, by connecting a current-source inverter module after the diode rectifier, three-phase AC power can be obtained from the current-source inverter module and input to the grid via a step-up transformer. This solves the problem of insufficient DC voltage after diode rectification at low wind speeds, thus resolving the voltage drop issue of the uncontrolled rectifier circuit under low to medium wind speed conditions. This improves power generation efficiency under low to medium wind speed conditions, enabling grid-connected power generation across a wide speed range. Therefore, the embodiments of this application achieve advantages such as low cost, high operating efficiency, high reliability, and high power quality. Simultaneously, it reduces the rate of damage to the generator stator winding insulation and improves power generation efficiency under low to medium wind speed conditions, thereby enabling grid-connected power generation across a wide speed range. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a wind power conversion device provided in one embodiment of this application;

[0027] Figure 2 This is a flowchart of a control method for an inverter module provided in one embodiment of this application;

[0028] Figure 3 yes Figure 2 A flowchart of a specific method for step S160;

[0029] Figure 4 This is a flowchart of a control method for an inverter module provided in one embodiment of this application;

[0030] Figure 5 This is a schematic diagram of the simulation results of the current on the six-phase permanent magnet synchronous generator side, the current on the phase-shifting transformer side, and the current on the diode rectifier side provided in one embodiment of this application.

[0031] Figure 6 This is a schematic diagram of the simulation results of the current on the side of a six-phase permanent magnet synchronous generator after performing a fast Fourier transform, according to an embodiment of this application.

[0032] Figure 7 This is a flowchart of the simulation results of the DC-side current and DC-side current of a first current source inverter provided in one embodiment of this application;

[0033] Figure 8 This is a current waveform diagram of the AC side current of a first current source inverter before and after filtering, provided in one embodiment of this application.

[0034] Figure 9 This is a schematic diagram of the structure of a wind power conversion device provided in another embodiment of this application. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0036] It should be noted that although the flowchart shows a logical order, in some cases, the steps shown or described may be performed in a different order than that shown in the flowchart. In the description of the specification, claims, and the foregoing drawings, "two or more" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of terms such as "first" and "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.

[0037] This application provides a wind power conversion device. Compared to using a PWM rectifier in the wind power conversion device, using a diode rectifier improves the reliability of the rectifier, avoids the high cost of PWM rectifiers and the waste of bidirectional power function of AC / DC PWM rectifiers connected to the input of wind turbines in related technologies, and avoids the risk of damage to the stator winding insulation of the motor due to the high voltage change rate of the PWM rectifier, thereby reducing the damage rate of the generator stator winding insulation and thus reducing the maintenance cost of the generator. By using a six-phase permanent magnet synchronous generator in the wind power conversion device, the operating efficiency of the system can be improved. Moreover, by combining the double stator winding structure of the six-phase permanent magnet synchronous generator with a 30° phase difference in back electromotive force with a diode rectifier, the 5th and 7th harmonic currents on the generator side can be eliminated, avoiding the serious AC current caused by uncontrolled diode rectification. The distortion problem is addressed by absorbing most of the 5th and 7th harmonic currents on the rectifier side through the phase-shifting transformer, optimizing the waveform quality of the AC current on the generator side. Furthermore, by connecting a current-source inverter module after the diode rectifier, three-phase AC power can be obtained from the current-source inverter module and input to the grid through a step-up transformer. This solves the problem of insufficient DC voltage after diode rectification at low wind speeds, thus resolving the voltage drop issue of the uncontrolled rectifier circuit under low to medium wind speed conditions. This improves power generation efficiency under low to medium wind speed conditions, enabling grid-connected power generation across a wide speed range. Therefore, the embodiments of this application achieve advantages such as low cost, high operating efficiency, high reliability, and high power quality, while reducing the rate of damage to the generator stator winding insulation and improving power generation efficiency under low to medium wind speed conditions, thereby enabling grid-connected power generation across a wide speed range.

[0038] The embodiments of this application will be further described below with reference to the accompanying drawings.

[0039] like Figure 1 As shown, Figure 1 This is a schematic diagram of a wind power conversion device provided in one embodiment of the present invention.

[0040] like Figure 1As shown, the wind power conversion device includes a wind turbine 100, a step-up transformer 600, a six-phase permanent magnet synchronous generator 200, a diode rectifier 400, a phase-shifting transformer 300, and a current source inverter module 500. The six-phase permanent magnet synchronous generator 200 includes dual stator windings, a rotor, and a filter inductor assembly. The back electromotive force phase difference of the dual stator windings is 30°. The rotor is connected to the wind turbine 100, and the dual stator windings are connected to the filter inductor assembly. The diode rectifier 400 is connected to the filter inductor assembly. An inductor assembly; a phase-shifting transformer 300 is connected in parallel between the filter inductor assembly and the diode rectifier 400; a current source inverter module 500 is connected to the diode rectifier 400 and the step-up transformer 600 respectively. The current source inverter module 500 is used to receive the DC-side inductor current and DC bus voltage from the diode rectifier 400, obtain three-phase AC power based on the DC-side inductor current and DC bus voltage, and input the three-phase AC power to the power grid 700 through the step-up transformer 600.

[0041] It should be noted that the diode rectifier 400 can be used to receive a three-phase AC power supply with a 30° phase difference from the back electromotive force of the dual stator windings, and rectify the three-phase AC power supply to obtain the DC bus voltage. Alternatively, the three-phase AC power can be obtained based on the DC-side inductor current and the DC bus voltage. Specifically, a constant current source can be constructed based on the DC-side inductor current and the DC bus voltage. This constant current source, after passing through the current source inverter module 500, can produce three-phase AC power. This three-phase AC power is essentially in phase with the grid voltage and is low-THD (Total Harmonic Distortion) AC power.

[0042] It should be noted that the phase-shifting transformer 300 connected to the diode rectifier 400 has a small capacity.

[0043] In one feasible implementation, the step-up transformer 600 can be a 690V / 35kV step-up transformer 600 (i.e., the 690V / 35kV step-up transformer 600 can step up 690V voltage to 35kV voltage), or it can be a step-up transformer 600 of other specifications. Furthermore, the step-up transformer 600 can be a DC / DC converter, and no specific limitations are imposed here.

[0044] In this embodiment, compared to setting a PWM rectifier in the wind power conversion device, by utilizing the characteristic that the wind turbine 100 does not need to absorb active power from the grid 700, setting a diode rectifier 400 in the wind power conversion device can improve the reliability of the rectifier, avoid the high cost of PWM rectifiers and the waste of bidirectional power function of AC / DC PWM rectifiers connected to the input of wind turbines in related technologies, and avoid the risk of damage to the stator winding insulation of the motor due to the high voltage change rate of PWM rectifiers, thereby reducing the damage rate of the generator stator winding insulation and thus reducing the maintenance cost of the generator. By setting a six-phase permanent magnet synchronous generator 200 in the wind power conversion device, the operating efficiency of the system can be improved. Moreover, by combining the double stator winding structure of the six-phase permanent magnet synchronous generator 200 with a back electromotive force phase difference of 30° with the diode rectifier 400, the 5th and 7th harmonic currents on the generator side can be eliminated, avoiding AC side damage caused by uncontrolled diode rectification. The problem of severe current distortion is addressed by using a phase-shifting transformer 300 to absorb most of the 5th and 7th harmonic currents on the rectifier side, thus optimizing the waveform quality of the AC current on the generator side. Furthermore, by connecting a current-source inverter module 500 after the diode rectifier 400 to obtain three-phase AC power, and then inputting the three-phase AC power to the grid 700 via a step-up transformer 600, the problem of insufficient DC voltage after diode rectification under low wind speed conditions is solved. This addresses the issue of voltage drop in uncontrolled rectifier circuits under low to medium wind speed conditions, thereby improving power generation efficiency under low to medium wind speed conditions and enabling grid-connected power generation over a wide speed range. Therefore, the embodiments of this application achieve advantages such as low cost, high operating efficiency, high reliability, and high power quality, while also reducing the rate of damage to the generator stator winding insulation and improving power generation efficiency under low to medium wind speed conditions, thus enabling grid-connected power generation over a wide speed range.

[0045] It should be noted that the phase-shifting transformer 300 can be replaced with a polygonal autotransformer with a 30° phase difference between the primary and secondary sides. Replacing the phase-shifting transformer 300 with a polygonal autotransformer with a 30° phase difference between the primary and secondary sides can further reduce the transformer capacity and also eliminate the 5th and 7th harmonic currents on the generator side. However, this solution will result in a 3rd harmonic circulating current in the system. This circulating current forms a path through the autotransformer, diode rectifier 400, current source inverter module 500, and the point of common coupling (PCC) on the grid 700 side. Therefore, an additional circulating current suppression common-mode filter can be installed in the wind power conversion device to eliminate the 3rd harmonic circulating current, but this will increase the additional hardware cost and losses of the system. This application embodiment does not impose specific limitations on this.

[0046] In one embodiment, the fan 100 is provided with an impeller, and the rotor of the six-phase permanent magnet synchronous generator 200 can be connected to the impeller of the fan 100 through a coupling 800. This application embodiment does not impose specific limitations on this.

[0047] In one embodiment, the dual stator winding includes two sets of stator windings. The first set of stator windings includes an A-phase winding, a B-phase winding, and a C-phase winding. The second set of stator windings includes a U-phase winding, a V-phase winding, and a W-phase winding. The back electromotive force phase difference between the first set of stator windings and the second set of stator windings is 30°, that is, the back electromotive force phase difference between the A-phase winding and the U-phase winding is 30°, the back electromotive force phase difference between the B-phase winding and the V-phase winding is 30°, and the back electromotive force phase difference between the C-phase winding and the W-phase winding is 30°.

[0048] In one feasible implementation, the filter inductor assembly of the six-phase permanent magnet synchronous generator 200 may include multiple filter inductors. The number of filter inductors may be one, two, six or more, and this application embodiment does not impose specific limitations on this.

[0049] In one embodiment, the filter inductor assembly includes six filter inductors, namely a first filter inductor L1, a second filter inductor L2, a third filter inductor L3, a fourth filter inductor L4, a fifth filter inductor L5, and a sixth filter inductor L6. The nineteenth connection terminal of the first filter inductor L1 is connected to the A-phase winding, the twentieth connection terminal of the second filter inductor L2 is connected to the B-phase winding, the twenty-first connection terminal of the third filter inductor L3 is connected to the C-phase winding, the twenty-second connection terminal of the fourth filter inductor L4 is connected to the U-phase winding, the twenty-third connection terminal of the fifth filter inductor L5 is connected to the V-phase winding, and the twenty-fourth connection terminal of the sixth filter inductor L6 is connected to the W-phase winding.

[0050] In one embodiment, the phase-shifting transformer 300 includes a Y-side three-phase winding and a Δ-side three-phase winding, wherein the ratio of the number of turns of the Y-side three-phase winding to the number of turns of the Δ-side three-phase winding is 1: The Y-side three-phase winding includes a first connection point a1, a second connection point a2, and a third connection point a3. The Δ-side three-phase winding includes a fourth connection point a4, a fifth connection point a5, and a sixth connection point a6. The nineteenth connection terminal of the first filter inductor L1 is connected to the first connection point a1. The twentieth connection terminal of the second filter inductor L2 is connected to the second connection point a2. The twenty-first connection terminal of the third filter inductor L3 is connected to the third connection point a3. The twenty-second connection terminal of the fourth filter inductor L4 is connected to the fourth connection point a4. The twenty-third connection terminal of the fifth filter inductor L5 is connected to the fifth connection point a5. The twenty-fourth connection terminal of the sixth filter inductor L6 is connected to the sixth connection point a6.

[0051] In one embodiment, the current source inverter module 500 includes a first current source inverter and a second current source inverter. Both the first and second current source inverters include a DC side and an AC side. The DC side of the first and second current source inverters are both connected to a diode rectifier 400. The AC side of the first and second current source inverters are connected in parallel to a step-up transformer 600.

[0052] In one embodiment, the diode rectifier 400 includes a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, a seventh diode D7, an eighth diode D8, a ninth diode D9, a tenth diode D10, an eleventh diode D11, and a twelfth diode D12. The first diode D1 and the second diode D2 are connected in series to form a seventh branch, the third diode D3 and the fourth diode D4 are connected in series to form an eighth branch, the fifth diode D5 and the sixth diode D6 are connected in series to form a ninth branch, the seventh diode D7 and the eighth diode D8 are connected in series to form a tenth branch, the ninth diode D9 and the tenth diode D10 are connected in series to form an eleventh branch, and the eleventh diode D11 and the twelfth diode D12 are connected in series to form a twelfth branch. One end of the seventh branch, one end of the eighth branch, and one end of the ninth branch are connected in parallel to a first DC inductor L13, and the other end of the seventh branch, the other end of the eighth branch, and the other end of the ninth branch are connected in parallel to the AC side of a first current source inverter.

[0053] The nineteenth terminal of the first filter inductor L1 is connected between the anode of the first diode D1 and the cathode of the second diode D2, and the first connection point a1 is connected between the anode of the first diode D1 and the cathode of the second diode D2; the twentieth terminal of the second filter inductor L2 is connected between the anode of the third diode D3 and the cathode of the fourth diode D4, and the second connection point a2 is connected between the anode of the third diode D3 and the cathode of the fourth diode D4; the twenty-first terminal of the third filter inductor L3 is connected between the anode of the fifth diode D5 and the cathode of the sixth diode D6, and the third connection point a3 is connected between the anode of the fifth diode D5 and the cathode of the sixth diode D6.

[0054] Similarly, the 22nd connection terminal of the fourth filter inductor L4 is connected between the positive terminal of the seventh diode D7 and the negative terminal of the eighth diode D8, and the fourth connection point a4 is connected between the positive terminal of the seventh diode D7 and the negative terminal of the eighth diode D8; the 23rd connection terminal of the fifth filter inductor L5 is connected between the positive terminal of the ninth diode D9 and the negative terminal of the tenth diode D10, and the fifth connection point a5 is connected between the positive terminal of the ninth diode D9 and the negative terminal of the tenth diode D10; the 24th connection terminal of the sixth filter inductor L6 is connected between the positive terminal of the eleventh diode D11 and the negative terminal of the twelfth diode D12, and the sixth connection point a6 is connected between the positive terminal of the eleventh diode D11 and the negative terminal of the twelfth diode D12.

[0055] It should be noted that the DC side of the first current source inverter and the DC side of the second current source inverter are both connected to the DC side of the diode rectifier 400, and the AC side of the diode rectifier 400 is connected to the filter inductor assembly of the six-phase permanent magnet synchronous generator 200.

[0056] In one embodiment, the first current source inverter further includes a first power semiconductor unit. The DC side of the first current source inverter includes a first DC inductor L13, and the AC side of the first current source inverter includes a first filter, a second filter, and a third filter. The first power semiconductor unit is connected to the first DC inductor L13, the first filter, the second filter, and the third filter, respectively. The first DC inductor L13 is connected to a diode rectifier 400, and the first filter, the second filter, and the third filter are all connected to a step-up transformer 600.

[0057] In one embodiment, the first power semiconductor unit includes a first switching component, a second switching component, a third switching component, a fourth switching component, a fifth switching component, a sixth switching component, a first bridge arm, a second bridge arm, and a third bridge arm. The first switching component and the second switching component are connected in series through the first bridge arm to form a first branch. The third switching component and the fourth switching component are connected in series through the second bridge arm to form a second branch. The fifth switching component and the sixth switching component are connected in series through the third bridge arm to form a third branch. The first connection terminal of the first branch, the second connection terminal of the second branch, and the third connection terminal of the third branch are connected in parallel to a DC inductor. The fourth connection terminal of the first branch, the fifth connection terminal of the second branch, and the sixth connection terminal of the third branch are connected in parallel to a diode rectifier 400. A first filter is connected to the first bridge arm, a second filter is connected to the second bridge arm, and a third filter is connected to the third bridge arm.

[0058] In one feasible implementation, the first filter may include a seventh filter inductor L7 and a first filter capacitor C1, the second filter may include an eighth filter inductor L8 and a second filter capacitor C2, and the third filter may include a ninth filter inductor L9 and a third filter capacitor C3.

[0059] Specifically, one end of the first filter capacitor C1, one end of the second filter capacitor C2, and one end of the third filter capacitor C3 are connected in parallel. The other end of the first filter capacitor C1 is connected to one end of the seventh filter inductor L7 at the seventh connection point. The other end of the second filter capacitor C2 is connected to one end of the eighth filter inductor L8 at the eighth connection point. The other end of the third filter capacitor C3 is connected to one end of the ninth filter inductor L9 at the ninth connection point. The other ends of the seventh filter inductor L7, the eighth filter inductor L8, and the ninth filter inductor L9 are all connected to the step-up transformer 600. The seventh connection point is connected to the first bridge arm, the eighth connection point is connected to the second bridge arm, and the ninth connection point is connected to the third bridge arm.

[0060] In one feasible implementation, the first switching assembly includes a first switching device S1 and a thirteenth transistor D13; the second switching assembly includes a second switching device S2 and a fourteenth transistor D14; the third switching assembly includes a third switching device S3 and a fifteenth transistor D15; the fourth switching assembly includes a fourth switching device S4 and a sixteenth transistor D16; the fifth switching assembly includes a fifth switching device S5 and a seventeenth transistor D17; and the sixth switching assembly includes a sixth switching device S6 and an eighteenth transistor D18. The source of the first switching device S1 is connected to the positive terminal of the thirteenth transistor D13; the source of the second switching device S2 is connected to the positive terminal of the fourteenth transistor D14; the source of the third switching device S3 is connected to the positive terminal of the fifteenth transistor D15; the source of the fourth switching device S4 is connected to the positive terminal of the sixteenth transistor D16; the source of the fifth switching device S5 is connected to the positive terminal of the seventeenth transistor D17; and the source of the sixth switching device S6 is connected to the positive terminal of the eighteenth transistor D18.

[0061] The drains of the first switching device S1, the second switching device S2, and the third switching device S3 are connected in parallel to the first DC inductor L13. The cathode of the thirteenth transistor D13 is connected to the drain of the second switching assembly in the first bridge arm; the cathode of the fifteenth transistor D15 is connected to the drain of the fourth switching assembly in the second bridge arm; and the cathode of the seventeenth transistor D17 is connected to the drain of the sixth switching assembly in the third bridge arm. The cathodes of the fourteenth transistor D14, the sixteenth transistor D16, the eighteenth transistor D18, the anode of the second diode D2, the anode of the fourth diode D4, and the anode of the sixth diode D6 are connected in parallel.

[0062] In one embodiment, the second current source inverter further includes a second power semiconductor unit. The DC side of the second current source inverter includes a second DC inductor L14, and the AC side of the second current source inverter includes a fourth filter, a fifth filter, and a sixth filter. The second power semiconductor unit is connected to the second DC inductor L14, the fourth filter, the fifth filter, and the sixth filter, respectively. The second DC inductor L14 is connected to the diode rectifier 400, and the fourth filter, the fifth filter, and the sixth filter are all connected to the step-up transformer 600.

[0063] In one embodiment, the second power semiconductor unit includes a seventh switch assembly, an eighth switch assembly, a ninth switch assembly, a tenth switch assembly, an eleventh switch assembly, a twelfth switch assembly, a fourth bridge arm, a fifth bridge arm, and a sixth bridge arm. The seventh and eighth switch assemblies are connected in series through the fourth bridge arm to form a fourth branch. The ninth and tenth switch assemblies are connected in series through the fifth bridge arm to form a fifth branch. The eleventh and twelfth switch assemblies are connected in series through the sixth bridge arm to form a sixth branch. The seventh connection terminal of the fourth branch, the eighth connection terminal of the fifth branch, and the ninth connection terminal of the sixth branch are connected in parallel to a DC inductor. The tenth connection terminal of the fourth branch, the eleventh connection terminal of the fifth branch, and the twelfth connection terminal of the sixth branch are connected in parallel to a diode rectifier 400. A fourth filter is connected to the fourth bridge arm, a fifth filter is connected to the fifth bridge arm, and a sixth filter is connected to the sixth bridge arm.

[0064] The fourth filter may include the tenth filter inductor L10 and the fourth filter capacitor C4; the fifth filter may include the eleventh filter inductor L11 and the fifth filter capacitor C5; and the sixth filter may include the twelfth filter inductor L12 and the sixth filter capacitor C6.

[0065] Specifically, one end of the fourth filter capacitor C4, one end of the fifth filter capacitor C5, and one end of the sixth filter capacitor C6 are connected in parallel. The other end of the fourth filter capacitor C4 is connected to one end of the tenth filter inductor L10 at the tenth connection point. The other end of the fifth filter capacitor C5 is connected to one end of the eleventh filter inductor L11 at the eleventh connection point. The other end of the sixth filter capacitor C6 is connected to one end of the twelfth filter inductor L12 at the twelfth connection point. The other ends of the tenth filter inductor L10, the eleventh filter inductor L11, and the twelfth filter inductor L12 are all connected to the step-up transformer 600. The tenth connection point is connected to the fourth bridge arm, the eleventh connection point is connected to the fifth bridge arm, and the twelfth connection point is connected to the sixth bridge arm.

[0066] In one feasible implementation, the seventh switching assembly includes a seventh switching device S7 and a nineteenth transistor D19; the eighth switching assembly includes an eighth switching device S8 and a twentieth transistor D20; the ninth switching assembly includes a ninth switching device S9 and a twenty-first transistor D21; the tenth switching assembly includes a tenth switching device S10 and a twentieth diode D22; the eleventh switching assembly includes an eleventh switching device S11 and a twenty-third transistor D23; and the twelfth switching assembly includes a twelfth switching device S12 and a twenty-fourth transistor D24. The source of the seventh switching device S7 is connected to the positive terminal of the nineteenth transistor D19; the source of the ninth switching device S9 is connected to the positive terminal of the twenty-first transistor D21; the source of the eleventh switching device S11 is connected to the positive terminal of the twenty-third transistor D23; the source of the eighth switching device S8 is connected to the positive terminal of the twentieth transistor D20; the source of the tenth switching device S10 is connected to the positive terminal of the twentyth diode D22; and the source of the twelfth switching device S12 is connected to the positive terminal of the twenty-fourth transistor D24.

[0067] The drains of the seventh switching device S7, the eighth switching device S8, and the ninth switching device S9 are connected in parallel to the second DC inductor L14. The cathode of the nineteenth transistor D19 is connected to the drain of the eighth switching assembly in the fourth bridge arm; the cathode of the twenty-first transistor D21 is connected to the drain of the tenth switching assembly in the fifth bridge arm; and the cathode of the twenty-third transistor D23 is connected to the drain of the twelfth switching assembly in the sixth bridge arm. The cathodes of the twentieth transistor D20, the twentieth diode D22, and the twenty-fourth transistor D24, the anode of the eighth diode D8, the anode of the tenth diode D10, and the anode of the twelfth diode D12 are connected in parallel.

[0068] Understandably, the six-phase permanent magnet synchronous generator 200 ensures that the voltage after rectification by the diode rectifier 400 is still lower than the peak voltage on the grid side 700 even at the highest operating speed. This ensures that the current source inverter with the step-up characteristic from the DC side to the AC side operates within the linear modulation range. This not only solves the problem of insufficient DC voltage after rectification caused by the low-cost diode rectifier 400 at low wind speeds, but also allows the wind turbine 100 to operate at the maximum power point (MPPT), providing maximum power generation efficiency.

[0069] Understandably, the impeller of the wind turbine 100 drives the rotor of the six-phase permanent magnet synchronous generator 200 to rotate. The stator of the six-phase permanent magnet synchronous generator 200 outputs six-phase alternating current with variable frequency and amplitude. This six-phase alternating current passes through the six filter inductors of the six-phase permanent magnet synchronous generator 200 (i.e., the first filter inductor L1, the second filter inductor L2, the third filter inductor L3, the fourth filter inductor L4, the fifth filter inductor L5, and the sixth filter inductor L6) to form two sets of three-phase alternating currents, namely three-phase alternating current I1 and three-phase alternating current I2. These two sets of three-phase alternating currents then flow to the phase-shifting transformer 300. There is a 30° phase shift between the primary and secondary sides of the phase-shifting transformer 300, and the 5th and 7th harmonic currents generated by the diode rectifier 400 form harmonic circulating currents through the phase-shifting transformer 300. This ensures that the current on the six-phase permanent magnet synchronous generator 200 side does not contain the 5th and 7th harmonics, thereby improving the waveform quality of the alternating current. The diode rectifier 400 receives a three-phase AC power supply with a back electromotive force phase difference of 30° from the dual stator windings and rectifies the three-phase AC power supply to obtain a DC bus voltage. This DC bus voltage passes through the DC inductor on the DC side of the current source inverter to form a constant current source. This constant current source then passes through the power semiconductor unit and the AC side of the current source inverter to obtain a three-phase AC power supply with essentially the same phase as the grid voltage 700 and low THD. Finally, this three-phase AC power supply with essentially the same phase as the grid voltage 700 and low THD is input to the grid 700 through the step-up transformer 600.

[0070] Those skilled in the art will understand that the structure of the wind power conversion device involved in the above embodiments does not constitute a limitation on the embodiments of the present invention, and may include more or fewer components than those shown in the above figures, or combine certain components, or have different component arrangements.

[0071] Based on the structure of the wind power conversion device in the above embodiments, various embodiments of the control method for the inverter module are proposed below.

[0072] like Figure 2 As shown, Figure 2 This is a flowchart of a control method for an inverter module provided in one embodiment of this application. This control method for the inverter module can be applied to, for example... Figure 1 The wind power conversion device in the illustrated embodiment includes, but is not limited to, steps S110, S120, S130, S140, S150, and S160.

[0073] Step S110: Obtain the wind speed of the fan.

[0074] One feasible implementation method is to obtain the wind speed of the fan in many ways. For example, the wind speed of the fan can be measured by measuring the impeller of the fan. No specific limitation is made here.

[0075] Step S120: Determine the power reference value corresponding to the wind speed using a six-phase permanent magnet synchronous generator.

[0076] One feasible implementation method is to determine the power reference value corresponding to the wind speed of the wind turbine based on the speed-power curve of the six-phase permanent magnet synchronous generator at different wind speeds.

[0077] Step S130: Calculate the reference current value based on the DC bus voltage and power reference value of the diode rectifier.

[0078] Step S140: Determine the inductor current value of the DC inductor of the current source inverter module, and obtain the first current component based on the difference between the reference current value and the inductor current value.

[0079] The first current component is the d-axis component of the modulation wave. The inductance value of the DC inductor of the current source inverter module can be the inductance value of the first DC inductor of the first current source inverter, or the inductance value of the second DC inductor of the second current source inverter.

[0080] Step S150: Determine the second current component and the voltage phase angle of the power grid. Based on the first current component, the second current component, the voltage phase angle, and the inductor current value, obtain the modulation ratio.

[0081] The second current component is the q-axis component of the modulation wave.

[0082] Step S160: Control the current source inverter module according to the modulation ratio.

[0083] It should be noted that when the inductor current value of the DC inductor of the current source inverter module can be the inductor current value of the first DC inductor of the first current source inverter, the first current source inverter is controlled according to the modulation ratio; when the inductor current value of the DC inductor of the current source inverter module can be the inductor current value of the second DC inductor of the second current source inverter, the second current source inverter is controlled according to the modulation ratio, no specific restrictions are imposed here.

[0084] In this embodiment, by employing the control method of the inverter module including the steps S110 to S160 described above, the wind speed of the wind turbine can be obtained. Then, a power reference value corresponding to the wind speed is determined by a six-phase permanent magnet synchronous generator. Next, a reference current value is calculated based on the DC bus voltage of the diode rectifier and the power reference value. Then, the inductance current value of the DC inductor of the current source inverter module is determined. Based on the difference between the reference current value and the inductance current value, the first current component is obtained. The phase angle between the second current component and the grid voltage is determined. Based on the first current component, the second current component, the voltage phase angle, and the inductance current value, the modulation ratio is obtained. Finally, the current source inverter module is controlled according to the modulation ratio to drive the current source inverter module to work.

[0085] In one embodiment, reference is made to Figure 3 Step S160 may include, but is not limited to, steps S210 and S220.

[0086] Step S210: Input the modulation ratio into the space vector pulse width modulation to obtain multiple switching signals.

[0087] Step S220: Control the current source inverter module using a switching signal.

[0088] In this embodiment, by adopting the control method of the inverter module including the above steps S210 to S220, the modulation ratio can be input to the space vector pulse width modulation to obtain multiple switching signals, and then the switching signals are used to control the current source inverter module to drive the current source inverter module to work.

[0089] Specifically, such as Figure 4 As shown, taking the first current source inverter as an example, assuming the obtained wind speed of the wind turbine is v w Then, based on the speed-power curves of the six-phase permanent magnet synchronous generator at different wind speeds, the results at wind speed v are obtained. w The power reference value Pref is output and then divided by the DC bus voltage v of the diode rectifier. dc The reference current value i is obtained. dc_ref Then determine the inductor current value i of the first DC inductor of the first current source inverter. dc The first inductor current value i dc With reference current value i dc_ref The difference between them is input to a proportional-integral (PI) controller to obtain the d-axis component i of the modulated wave. dg (i.e., the first current component). Then, determine the q-axis component i of the modulation wave. qg (i.e., the second current component), by adjusting the q-axis component i of the modulation wave. qgThe command value can control the AC power factor of the first current source inverter; the three-phase voltage v of the grid obtained through the phase-locked loop (PLL) can be used to control the AC power factor of the first current source inverter. g voltage phase angle θ g The voltage phase angle θ g The angle used for the Park inverse transform of the modulated wave is the d-axis component i of the modulated wave. dg and q-axis component i qg Performing an inverse Park transform yields the modulated wave component in the stationary coordinate system. This component is then divided by the inductor current value i of the first DC inductor of the first current source inverter. dc The modulation ratio m is obtained, and finally the modulation ratio m is input to SVPWM (Space Vector Pulse Width Modulation) to obtain 6 switching signals, which drive the first current source inverter to work.

[0090] The following simulation results illustrate the effects achieved by the wind power conversion device provided in this application.

[0091] A simulation model of the wind power conversion device was built in PLECS simulation software. The simulation results of the current on the six-phase permanent magnet synchronous generator side, the current on the phase-shifting transformer side, and the current on the diode rectifier side are as follows: Figure 5 As shown, an FFT (Fast Fourier Transform) was performed on the current waveform on the generator side, and the simulation results of the FFT are as follows. Figure 6 As shown, in Figure 6 The study verified that the uncontrolled rectifier circuit can effectively eliminate the 5th and 7th harmonics of the stator current on the generator side by connecting a phase-shifting transformer between the two rectifier units.

[0092] In addition, such as Figure 7 As shown, taking the first current source inverter as an example, the simulation results of the DC side current of the first current source inverter are controlled at 400A, the effective value of the AC side voltage of the first current source inverter is 690V, and the peak value of the A-phase voltage is given as... This reflects the characteristics of current source boost. To suppress capacitor-inductor resonance, 20Ω resistors can be connected in parallel across the seventh filter inductor of the first filter, the eighth filter inductor of the second filter, and the ninth filter inductor of the third filter in the first current source inverter, respectively. Then, passive damping is applied to the first, second, and third filters to obtain the following result: Figure 8The current waveforms of the AC side of the first current source inverter before filtering by the first, second, and third filters (i.e., AC side current before filtering) and the current waveforms of the AC side of the first current source inverter after filtering by the first, second, and third filters (i.e., AC side current after filtering) are shown. By comparing the current waveforms of the AC side current before and after filtering, it is found that the waveform quality of the AC side current after filtering (i.e., the three-phase AC current input to the grid) is better.

[0093] Additionally, refer to Figure 9 An embodiment of this application also provides a wind power conversion device 900, which includes a memory 902, a processor 901, and a computer program stored in the memory 902 and executable on the processor 901.

[0094] The processor 901 and memory 902 can be connected via a bus or other means.

[0095] Memory 902, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory 902 may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory 902 may optionally include memory remotely located relative to processor 901, and these remote memories can be connected to processor 901 via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0096] The non-transient software program and instructions required to implement the wind power conversion device of the above embodiments are stored in the memory 902. When executed by the processor 901, the control method of the inverter module in the above embodiments is executed, for example, the method described above is executed. Figure 2 Method steps S110 to S160 in the text Figure 3 Method steps S210 to S220.

[0097] It should be noted that the wind power conversion device 900 in this embodiment can be, for example, Figure 1 Any of the wind power conversion devices shown in the embodiments belong to the same inventive concept, and therefore have the same implementation principle and beneficial effects, which will not be described in detail here.

[0098] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0099] One embodiment of this application also provides a computer-readable storage medium storing computer-executable instructions that are executed by a processor or controller, for example, by a processor in the above-described device embodiment, causing the processor to execute the control method of the inverter module in the above-described embodiment and perform the above-described actions. Figure 2 Method steps S110 to S160 in the text Figure 3 Method steps S210 to S220.

[0100] Furthermore, one embodiment of the present invention also provides a computer program product, including a computer program or computer instructions, which are stored in a computer-readable storage medium. A processor of a computer device reads the computer program or computer instructions from the computer-readable storage medium and executes the computer program or computer instructions, causing the computer device to perform the control method of the inverter module in the above embodiments, for example, performing the above-described... Figure 2 Method steps S110 to S160 in the text Figure 3 Method steps S210 to S220.

[0101] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

Claims

1. A wind power conversion device, characterized in that, include: Fan; Step-up transformer; A six-phase permanent magnet synchronous generator includes a dual stator winding, a rotor, and a filter inductor assembly. The back electromotive force phase difference of the dual stator winding is 30°. The rotor is connected to the wind turbine, and the dual stator winding is connected to the filter inductor assembly. A diode rectifier is connected to the filter inductor assembly; A phase-shifting transformer is connected in parallel between the filter inductor assembly and the diode rectifier. The phase-shifting transformer includes a Y-side three-phase winding and a Δ-side three-phase winding. The Y-side three-phase winding is connected to the first set of three-phase windings of the dual stator winding, and the Δ-side three-phase winding is connected to the second set of three-phase windings of the dual stator winding. The phase-shifting transformer is used to absorb the 5th and 7th harmonic currents generated by the diode rectifier. A current-source inverter module is provided, wherein the DC output terminal of the diode rectifier is directly connected to the DC side of the current-source inverter module without a DC boost chopper circuit between them. The AC side of the current-source inverter module is connected to the step-up transformer. The current-source inverter module has a boost characteristic from the DC side to the AC side and can operate within a linear modulation range. The current-source inverter module is used to receive the DC-side inductor current and DC bus voltage from the diode rectifier, obtain three-phase AC power based on the DC-side inductor current and the DC bus voltage, and input the three-phase AC power to the power grid through the step-up transformer. The six-phase permanent magnet synchronous generator is configured such that, even at the highest operating speed, the DC voltage after rectification by the diode rectifier is still lower than the peak value of the grid-side voltage.

2. The wind power conversion device according to claim 1, characterized in that, The current source inverter module includes a first current source inverter and a second current source inverter. Both the first current source inverter and the second current source inverter include a DC side and an AC side. The DC side of the first current source inverter and the DC side of the second current source inverter are both connected to the diode rectifier. The AC side of the first current source inverter and the AC side of the second current source inverter are connected in parallel to the step-up transformer.

3. The wind power conversion device according to claim 2, characterized in that, The first current source inverter further includes a first power semiconductor unit. The DC side of the first current source inverter includes a first DC inductor. The AC side of the first current source inverter includes a first filter, a second filter, and a third filter. The first power semiconductor unit is connected to the first DC inductor, the first filter, the second filter, and the third filter, respectively. The first DC inductor is connected to the diode rectifier. The first filter, the second filter, and the third filter are all connected to the step-up transformer.

4. The wind power conversion device according to claim 3, characterized in that, The first power semiconductor unit includes a first switching assembly, a second switching assembly, a third switching assembly, a fourth switching assembly, a fifth switching assembly, a sixth switching assembly, a first bridge arm, a second bridge arm, and a third bridge arm. The first switching assembly and the second switching assembly are connected in series through the first bridge arm to form a first branch. The third switching assembly and the fourth switching assembly are connected in series through the second bridge arm to form a second branch. The fifth switching assembly and the sixth switching assembly are connected in series through the third bridge arm to form a third branch. The first connection terminal of the first branch, the second connection terminal of the second branch, and the third connection terminal of the third branch are connected in parallel to the DC inductor. The fourth connection terminal of the first branch, the fifth connection terminal of the second branch, and the sixth connection terminal of the third branch are connected in parallel to the diode rectifier. The first filter is connected to the first bridge arm, the second filter is connected to the second bridge arm, and the third filter is connected to the third bridge arm.

5. The wind power conversion device according to claim 2, characterized in that, The second current source inverter further includes a second power semiconductor unit. The DC side of the second current source inverter includes a second DC inductor, and the AC side of the second current source inverter includes a fourth filter, a fifth filter, and a sixth filter. The second power semiconductor unit is connected to the second DC inductor, the fourth filter, the fifth filter, and the sixth filter, respectively. The second DC inductor is connected to the diode rectifier, and the fourth filter, the fifth filter, and the sixth filter are all connected to the step-up transformer.

6. The wind power conversion device according to claim 5, characterized in that, The second power semiconductor unit includes a seventh switch assembly, an eighth switch assembly, a ninth switch assembly, a tenth switch assembly, an eleventh switch assembly, a twelfth switch assembly, a fourth bridge arm, a fifth bridge arm, and a sixth bridge arm. The seventh switch assembly and the eighth switch assembly are connected in series through the fourth bridge arm to form a fourth branch. The ninth switch assembly and the tenth switch assembly are connected in series through the fifth bridge arm to form a fifth branch. The eleventh switch assembly and the twelfth switch assembly are connected in series through the sixth bridge arm to form a sixth branch. The seventh connection terminal of the fourth branch, the eighth connection terminal of the fifth branch, and the ninth connection terminal of the sixth branch are connected in parallel to the DC inductor. The tenth connection terminal of the fourth branch, the eleventh connection terminal of the fifth branch, and the twelfth connection terminal of the sixth branch are connected in parallel to the diode rectifier. The fourth filter is connected to the fourth bridge arm, the fifth filter is connected to the fifth bridge arm, and the sixth filter is connected to the sixth bridge arm.

7. A control method for an inverter module, characterized in that, The control method, applied to the wind power conversion device as described in any one of claims 1 to 6, comprises: Obtain the wind speed of the fan; The power reference value corresponding to the wind speed is determined by the six-phase permanent magnet synchronous generator. The reference current value is calculated based on the DC bus voltage of the diode rectifier and the power reference value. Determine the inductor current value of the DC inductor of the current source inverter module, and obtain the first current component based on the difference between the reference current value and the inductor current value; Determine the second current component and the voltage phase angle of the power grid, and obtain the modulation ratio based on the first current component, the second current component, the voltage phase angle, and the inductor current value; The current source inverter module is controlled according to the modulation ratio.

8. The control method according to claim 7, characterized in that, The step of controlling the current source inverter module according to the modulation ratio includes: The modulation ratio is input to space vector pulse width modulation to obtain multiple switching signals; The current source inverter module is controlled using the switching signal.

9. A wind power conversion device, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the control method according to any one of claims 7 to 8.

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