Switched reluctance motor power converter high power-to-weight ratio filter multiplexing topological structure

Abstract

The invention belongs to the technical field of design of a switched reluctance motor power converter of an aviation high-voltage direct-current power supply system, and particularly relates to a multiplexing topological structure of a high-power-to-weight-ratio filter of a switched reluctance motor power converter. By improving the topological structure of the system, the direct-current filter is multiplexed at a starting end and a power generation end and works at the starting stage and the power generation stage in a time-sharing manner; in the aspect of the system, a starting end direct current filter is prevented from being added, the size and weight of the system are reduced through a multiplexing mode while the requirement for input end power supply harmonic waves is met and the power factor is improved, and the power-to-weight ratio of the switched reluctance motor power converter is greatly improved.

Description

Technical Field

[0001] The present application belongs to the technical field of design of switched reluctance motor power converters for aviation high-voltage direct current power supply systems, and specifically relates to a high power-to-weight ratio filter multiplexing topology structure of a switched reluctance motor power converter. Background Art

[0002] With the continuous development of more electric and all-electric aircraft technology, aviation power systems are developing towards large capacity, high power density, high reliability and high fault tolerance. Switched reluctance motors have the characteristics of simple structure, high reliability, high power density, high efficiency and high-speed operation capability. Therefore, the switched reluctance starting / generating system has a wide range of application scenarios as the preferred solution for aviation high-voltage DC power systems.

[0003] In switched reluctance high-power applications, power converters are mainly based on dual three-phase asymmetric half-bridge power topology. Two single three-phase asymmetric half-bridge power topologies are connected in parallel at their starting voltage input and generating voltage output terminals to form a dual three-phase asymmetric half-bridge power topology. Figure 1 As shown, the topology of the power generation output filter is a π-type filter, which is mainly composed of differential mode inductors L1, L2 and support capacitors C1, C2. Among them, the differential mode inductors L1, L2 mainly filter the pulsating DC current at the power generation output end, and the support capacitors C1, C2 can reduce the voltage pulsation at the output end, so that the output electric energy during the power generation operation meets the power supply quality requirements of the 270V high-voltage DC power supply.

[0004] Normally, the starting / generating system not only needs to consider the quality of the power output under the generating condition, but also how to improve the power factor and reduce the interference to the front-end power supply during the starting stage. When the switched reluctance starting / generating system is working in the starting stage, the starting power supply can be provided by an external high-voltage DC power supply or a three-phase AC power supply after uncontrolled rectification to provide 270V power for the starting stage. In order to ensure that the high-order harmonic components caused by high-frequency switching in the power converter during the starting stage do not affect the previous power grid, and to improve the power factor of the input power supply, it is necessary to add a starting power supply filter on the DC side, such as Figure 2 As shown, under this technical solution, during the starting stage, the power generation output filter does not play a filtering role, and during the power generation stage, the differential mode inductor in the starting filter does not work, and the function of the filter cannot be fully utilized. At the same time, for application scenarios with large starting power, the size and weight of the starting filter are relatively large, which is not conducive to the optimization of the system power-to-weight ratio.

[0005] This application is proposed in view of the above-mentioned technical defects.

[0006] It should be noted that the disclosure of the above background technology content is only used to assist in understanding the inventive concept and technical solution of the present application, and it does not necessarily belong to the prior art of the present patent application. In the absence of clear evidence that the above content has been disclosed on the filing date of the present application, the above background technology should not be used to evaluate the novelty and creativity of the present application. Summary of the invention

[0007] The purpose of the present application is to provide a high power-to-weight ratio filter multiplexing topology structure for a switched reluctance motor power converter to overcome or alleviate at least one of the known technical defects.

[0008] The technical solution of this application is:

[0009] A high power-to-weight ratio filter multiplexing topology structure of a switched reluctance motor power converter, comprising:

[0010] Support capacitors C1 and C2 are arranged in parallel;

[0011] Differential mode inductors L1 and L2 are connected in parallel between supporting capacitors C1 and C2 to form a starting / generating output filter, wherein the line where the differential mode inductor L1 is located is connected to the 270V positive terminal of the generating device, and the line where the differential mode inductor L2 is located is connected to the negative terminal of the generating device / the negative terminal of the starting device;

[0012] The C-phase diode CD2 is connected to the line where the differential mode inductor L1 is located;

[0013] C phase IGBTCQ1, connected to the line where the differential mode inductor L1 is located, and connected to the C phase diode CD2;

[0014] C phase diode CD1 is connected in parallel with C phase IGBTCQ1;

[0015] The C-phase diode CD3 is connected to the line where the differential mode inductor L2 is located;

[0016] C phase IGBTCQ2 is connected to C phase diode CD3;

[0017] C-phase diode CD4 is connected in parallel with C-phase IGBTCQ2;

[0018] The C-phase winding is connected between the lines where the C-phase diode CD2 and the C-phase diode CD3 are located, and the two ends are located between the C-phase diode CD2 and the C-phase IGBT Q1, and between the C-phase diode CD3 and the C-phase IGBT Q2;

[0019] The B-phase diode BD2 is connected to the line where the differential mode inductor L1 is located;

[0020] B-phase IGBTBQ1, connected to the line where the differential mode inductor L1 is located, and connected to the B-phase diode BD2;

[0021] B-phase diode BD1 is connected in parallel with B-phase IGBTBQ1;

[0022] The B-phase diode BD3 is connected to the line where the differential mode inductor L2 is located;

[0023] B-phase IGBTBQ2, connected to B-phase diode BD3;

[0024] B-phase diode BD4 is connected in parallel with B-phase IGBTBQ2;

[0025] The B-phase winding is connected between the circuits where the B-phase diodes BD2 and BD3 are located, and the two ends are located between the B-phase diodes BD2 and B-phase IGBTBQ1, and between the B-phase diodes BD3 and B-phase IGBTBQ2;

[0026] A-phase diode AD2 is connected to the line where the differential mode inductor L1 is located;

[0027] A-phase IGBTAQ1, connected to the line where the differential mode inductor L1 is located, and connected to the A-phase diode AD2;

[0028] A-phase diode AD1 is connected in parallel with A-phase IGBTAQ1;

[0029] A-phase diode AD3 is connected to the line where the differential mode inductor L2 is located;

[0030] A phase IGBTAQ2, connected to A phase diode AD3;

[0031] A-phase diode AD4 is connected in parallel with A-phase IGBTAQ2;

[0032] The A-phase winding is connected between the lines where the A-phase diode AD2 and the A-phase diode AD3 are located, and the two ends are located between the A-phase diode AD2 and the A-phase IGBTAQ1, and between the A-phase diode AD3 and the A-phase IGBTAQ2;

[0033] The end diode LD is connected to the line where the differential mode inductor L1 is located, and is located between the A-phase diode AD2 and the A-phase IGBTAQ2;

[0034] The anti-reverse diode VD is connected to the line where the differential mode inductor L1 is located and connected to the starting positive terminal.

[0035] In some optional embodiments, in the above-mentioned switched reluctance motor power converter high power-to-weight ratio filter multiplexing topology structure, the power generation positive terminal is a power generation 270V positive terminal.

[0036] In some optional embodiments, in the above-mentioned switched reluctance motor power converter high power-to-weight ratio filter multiplexing topology structure, the power generation negative terminal is a power generation 270V negative terminal.

[0037] In some optional embodiments, in the above-mentioned switched reluctance motor power converter high power-to-weight ratio filter multiplexing topology structure, the starting negative terminal is a starting 270V negative terminal.

[0038] In some optional embodiments, the above-mentioned switched reluctance motor power converter high power-to-weight ratio filter multiplexing topology structure further includes:

[0039] The end capacitor VC has one end connected to the line where the differential mode inductor L2 is located, and the other end connected to the C-phase diode CD4, the B-phase diode BD4, and the A-phase diode AD4.

[0040] This application has at least the following beneficial technical effects:

[0041] A high power-to-weight ratio filter reuse topology structure of a switched reluctance motor power converter is provided. By improving the system topology structure, a DC filter is reused at the starting and generating ends, and works in the starting and generating stages in a time-sharing manner. From the perspective of the system, the addition of a starting-end DC filter is avoided. While satisfying the input-end power supply harmonics and improving its power factor, the volume and weight of the system are reduced by multiplexing, thereby greatly improving the power-to-weight ratio of the switched reluctance motor power converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of a dual three-phase asymmetric half-bridge power topology of an existing switched reluctance motor power converter;

[0043] Figure 2 It is a schematic diagram of adding a starting power supply filter to an existing switched reluctance motor power converter;

[0044] Figure 3 It is a schematic diagram of a multiplexing topology structure of a high power-to-weight ratio filter of a switched reluctance motor power converter provided in an embodiment of the present application;

[0045] Figure 4 It is a schematic diagram of the operation of the high power-to-weight ratio filter multiplexing topology structure of the switched reluctance motor power converter provided by an embodiment of the present application during the starting phase;

[0046] Figure 5 It is a schematic diagram of the operation of the high power-to-weight ratio filter multiplexing topology structure of the switched reluctance motor power converter provided in an embodiment of the present application during the power generation stage.

[0047] In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. In addition, the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. DETAILED DESCRIPTION

[0048] In order to make the technical solution and advantages of the present application clearer, the technical solution of the present application will be further described in detail in detail and in detail in conjunction with the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present application, which are only used to explain the present application, not to limit the present application. It should be noted that, for the convenience of description, only the parts related to the present application are shown in the accompanying drawings, and other related parts can refer to the general design. In the absence of conflict, the embodiments in the present application and the technical features in the embodiments can be combined with each other to obtain new embodiments.

[0049] In addition, unless otherwise defined, the technical terms or scientific terms used in the description of this application shall be the common meanings understood by the general technicians in the field to which this application belongs. The words "upper", "lower", "left", "right", "center", "vertical", "horizontal", "inside", "outside" and other words indicating orientation used in the description of this application are only used to indicate the relative direction or positional relationship, and do not imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. When the absolute position of the described object changes, its relative positional relationship may also change accordingly, so it cannot be understood as a limitation on this application. The "first", "second", "third" and similar terms used in the description of this application are only used for descriptive purposes to distinguish different components, and cannot be understood as indicating or implying relative importance. The similar words "one", "one" or "the" used in the description of this application should not be understood as an absolute limitation on quantity, but should be understood as the existence of at least one. The similar words "including" or "comprising" used in the description of this application mean that the elements or objects appearing in front of the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0050] In addition, it should be noted that, unless otherwise clearly specified and limited, the words "installed", "connected", "connected" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. Technical personnel in the field can understand their specific meanings in this application according to the specific circumstances.

[0051] The following is combined with Figures 1 to 5 This application is described in further detail.

[0052] A high power-to-weight ratio filter multiplexing topology for a switched reluctance motor power converter, such as Figure 3 As shown, including:

[0053] Support capacitors C1 and C2 are arranged in parallel;

[0054] Differential mode inductors L1 and L2 are connected in parallel between supporting capacitors C1 and C2 to form a starting / generating filter, wherein the line where the differential mode inductor L1 is located is connected to the 270V generating positive terminal and the 270V starting terminal VD diode, and the line where the differential mode inductor L2 is located is connected to the 270V generating negative terminal / starting 270V negative terminal;

[0055] The C-phase diode CD2 is connected to the line where the differential mode inductor L1 is located;

[0056] C phase IGBTCQ1, connected to the line where the differential mode inductor L1 is located, and connected to the C phase diode CD2;

[0057] C phase diode CD1 is connected in parallel with C phase IGBTCQ1;

[0058] The C-phase diode CD3 is connected to the line where the differential mode inductor L2 is located;

[0059] C phase IGBTCQ2 is connected to C phase diode CD3;

[0060] C-phase diode CD4 is connected in parallel with C-phase IGBTCQ2;

[0061] The C-phase winding is connected between the lines where the C-phase diode CD2 and the C-phase diode CD3 are located, and the two ends are located between the C-phase diode CD2 and the C-phase IGBT Q1, and between the C-phase diode CD3 and the C-phase IGBT Q2;

[0062] The B-phase diode BD2 is connected to the line where the differential mode inductor L1 is located;

[0063] B-phase IGBTBQ1, connected to the line where the differential mode inductor L1 is located, and connected to the B-phase diode BD2;

[0064] B-phase diode BD1 is connected in parallel with B-phase IGBTBQ1;

[0065] The B-phase diode BD3 is connected to the line where the differential mode inductor L2 is located;

[0066] B-phase IGBTBQ2, connected to B-phase diode BD3;

[0067] B-phase diode BD4 is connected in parallel with B-phase IGBTBQ2;

[0068] The B-phase winding is connected between the circuits where the B-phase diodes BD2 and BD3 are located, and the two ends are located between the B-phase diodes BD2 and B-phase IGBTBQ1, and between the B-phase diodes BD3 and B-phase IGBTBQ2;

[0069] A-phase diode AD2 is connected to the line where the differential mode inductor L1 is located;

[0070] A-phase IGBTAQ1, connected to the line where the differential mode inductor L1 is located, and connected to the A-phase diode AD2;

[0071] A-phase diode AD1 is connected in parallel with A-phase IGBTAQ1;

[0072] A-phase diode AD3 is connected to the line where the differential mode inductor L2 is located;

[0073] A phase IGBTAQ2, connected to A phase diode AD3;

[0074] A-phase diode AD4 is connected in parallel with A-phase IGBTAQ2;

[0075] The A-phase winding is connected between the lines where the A-phase diode AD2 and the A-phase diode AD3 are located, and the two ends are located between the A-phase diode AD2 and the A-phase IGBTAQ1, and between the A-phase diode AD3 and the A-phase IGBTAQ2;

[0076] The end capacitor VC has one end connected to the line where the differential mode inductor L2 is located, and the other end connected to the C phase diode CD4, the B phase diode BD4, and the A phase diode AD4;

[0077] The end diode LD is connected to the line where the differential mode inductor L1 is located, and is located between the A-phase diode AD2 and the A-phase IGBTAQ2;

[0078] The anti-reverse diode VD is connected to the line where the differential mode inductor L1 is located and connected to the starting 270V positive terminal.

[0079] Based on the high power-to-weight ratio filter multiplexing topology structure of the switched reluctance motor power converter disclosed in the above embodiment, when the starting / generating system is working in the starting stage, the external power supply can be connected to the power converter through the starting 270V positive terminal and the starting 270V negative terminal, and then pass through the starting / generating filter to the switch topology. At this time, the differential mode inductors L1 and L2 in the starting / generating filter can ensure that when the starting / generating system is running in the starting stage, the high-order harmonic components caused by the high-frequency switch in the power converter do not affect the previous power grid, and improve the power factor of the input power supply. At the same time, the parallel support capacitors C1 and C2 in the starting / generating filter can meet the starting voltage fluctuation requirements. When the starting / generating system is working in the generating stage, the electric energy output by the motor winding passes through the power converter and then outputs the starting / generating filter, and after filtering by the starting / generating filter, the electric energy that meets the power supply quality requirements is output. In addition, the high power-to-weight ratio filter multiplexing topology of the switched reluctance motor power converter disclosed in the above embodiment adds an anti-reverse diode VD at the starting 270V positive end to prevent the electric energy output by the generator from being injected into the starting power supply end.

[0080] The high power-to-weight ratio filter multiplexing topology of the switched reluctance motor power converter works as follows during the starting phase: Figure 4 As shown, the electric energy provided by the external power supply passes through the starting / generating filter and then reaches the main converter topology. The supporting capacitors C1 and C2 can work together to reduce the voltage pulsation of the starting power bus. The differential mode inductors L1 and L2 can smooth the starting bus current, effectively reduce the harmonic content of the input current, and reduce the impact on the power quality on the input side.

[0081] The high power-to-weight ratio filter multiplexing topology of the switched reluctance motor power converter works as follows during the power generation phase: Figure 5 As shown, the supporting capacitors C1 and C2 convert the DC pulse current outputted by each phase into voltage and ensure that the voltage pulsation at the output end of the generator meets the requirements. The differential mode inductors L1 and L2 smooth the output DC pulse current waveform, which can reduce the AC harmonic content of the generator output current, improve the quality of the output DC power supply voltage, and meet the power supply index requirements.

[0082] In the high power-to-weight ratio filter reuse topology of the switched reluctance motor power converter disclosed in the above-mentioned embodiment, a filter reuse topology is adopted, and the starting power supply 270V negative terminal and the generator output 270V negative terminal in the switched reluctance starting / generating power converter share a terminal, and there is no need to add an additional starting power supply filter, which facilitates the structure and weight reduction design of the controller and improves the power-to-weight ratio of the controller.

[0083] The high power-to-weight ratio filter reuse topology of the switched reluctance motor power converter disclosed in the above-mentioned embodiment improves the system topology and reuses the DC filter at the starting and generating ends, and works in the starting and generating stages in a time-sharing manner. From the system perspective, it avoids adding a DC filter at the starting end. While meeting the input power supply harmonics and improving its power factor, the volume and weight of the system are reduced by multiplexing, thereby greatly improving the power-to-weight ratio of the switched reluctance motor power converter.

[0084] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. Those skilled in the art should understand that the scope of protection of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the scope of protection of the present application.

Claims

1. A high power-to-weight ratio filter multiplexing topology structure for a switched reluctance motor power converter, characterized in that: include: Support capacitors C1 and C2 are arranged in parallel; Differential mode inductors L1 and L2 are arranged in parallel between supporting capacitors C1 and C2 to form a starting / generating output filter, wherein the line where the differential mode inductor L1 is located is connected to the generating positive terminal, and the line where the differential mode inductor L2 is located is connected to the generating negative terminal / starting negative terminal; The C-phase diode CD2 is connected to the line where the differential mode inductor L1 is located; C phase IGBTCQ1, connected to the line where the differential mode inductor L1 is located, and connected to the C phase diode CD2; C phase diode CD1 is connected in parallel with C phase IGBTCQ1; The C-phase diode CD3 is connected to the line where the differential mode inductor L2 is located; C phase IGBTCQ2 is connected to C phase diode CD3; C-phase diode CD4 is connected in parallel with C-phase IGBTCQ2; The C-phase winding is connected between the lines where the C-phase diode CD2 and the C-phase diode CD3 are located, and the two ends are located between the C-phase diode CD2 and the C-phase IGBT Q1, and between the C-phase diode CD3 and the C-phase IGBT Q2; The B-phase diode BD2 is connected to the line where the differential mode inductor L1 is located; B-phase IGBTBQ1, connected to the line where the differential mode inductor L1 is located, and connected to the B-phase diode BD2; B-phase diode BD1 is connected in parallel with B-phase IGBTBQ1; The B-phase diode BD3 is connected to the line where the differential mode inductor L2 is located; B-phase IGBTBQ2, connected to B-phase diode BD3; B-phase diode BD4 is connected in parallel with B-phase IGBTBQ2; The B-phase winding is connected between the circuits where the B-phase diodes BD2 and BD3 are located, and the two ends are located between the B-phase diodes BD2 and B-phase IGBTBQ1, and between the B-phase diodes BD3 and B-phase IGBTBQ2; A-phase diode AD2 is connected to the line where the differential mode inductor L1 is located; A-phase IGBTAQ1, connected to the line where the differential mode inductor L1 is located, and connected to the A-phase diode AD2; A-phase diode AD1 is connected in parallel with A-phase IGBTAQ1; A-phase diode AD3 is connected to the line where the differential mode inductor L2 is located; A phase IGBTAQ2, connected to A phase diode AD3; A-phase diode AD4 is connected in parallel with A-phase IGBTAQ2; The A-phase winding is connected between the lines where the A-phase diode AD2 and the A-phase diode AD3 are located, and the two ends are located between the A-phase diode AD2 and the A-phase IGBTAQ1, and between the A-phase diode AD3 and the A-phase IGBTAQ2; The end diode LD is connected to the line where the differential mode inductor L1 is located, and is located between the A-phase diode AD2 and the A-phase IGBTAQ2; The anti-reverse diode VD is connected to the line where the differential mode inductor L1 is located and connected to the starting positive terminal.

2. The high power-to-weight ratio filter multiplexing topology structure of the switched reluctance motor power converter according to claim 1 is characterized in that: The positive terminal of the power generation is the positive terminal of the power generation 270V.

3. The high power-to-weight ratio filter multiplexing topology structure of the switched reluctance motor power converter according to claim 1, characterized in that: The negative terminal of the power generation is the negative terminal of the power generation 270V.

4. The high power-to-weight ratio filter multiplexing topology structure of the switched reluctance motor power converter according to claim 1, characterized in that: The starting negative terminal is the starting 270V negative terminal.

5. The high power-to-weight ratio filter multiplexing topology structure of the switched reluctance motor power converter according to claim 1, characterized in that: Also includes: The end capacitor VC has one end connected to the line where the differential mode inductor L2 is located, and the other end connected to the C-phase diode CD4, the B-phase diode BD4, and the A-phase diode AD4.

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