Two-stage switched reluctance generator with permanent magnet generator

Abstract

The application belongs to the technical field of switched reluctance motor, and relates to a two-stage switched reluctance generator with a permanent magnet generator, which comprises a two-stage double-channel switched reluctance motor and a motor controller, a complete shell composed of a main shell and an end cover, a shaft supported by two end bearings in the shell, a switched reluctance motor stator installed on the main shell, a permanent magnet motor stator and a rotary transformer stator installed on the end cover, and a switched reluctance motor rotor, a permanent magnet motor rotor and a rotary transformer rotor all installed on the shaft. The permanent magnet motor stator winding outputs three independent three-phase alternating currents, one of which is used for power supply of the motor controller, and the other two are two excitation channels, i.e. a PMG-1 channel and a PMG-2 channel, which provide a direct current excitation power source for the switched reluctance motor after rectification, and the switched reluctance motor is provided with two independent three-phase alternating current power conversion channels.

Description

Technical Field

[0001] This invention belongs to the field of switched reluctance motor technology and relates to a two-stage switched reluctance generator with a permanent magnet generator. Background Technology

[0002] Existing switched reluctance motors are single-stage motors. Both the stator and rotor of a switched reluctance motor are salient-pole structures, i.e., double salient-pole structures, and are made of silicon steel sheets or other magnetically conductive materials stacked together. Each pole of the stator is wound with concentrated windings, and the windings on radially opposite poles can be connected in series to form a phase. The rotor has no windings or permanent magnets, but is equipped with a position detector.

[0003] Power converters for switched reluctance motors widely employ a single-channel three-phase asymmetrical half-bridge topology. Each phase winding is connected to two controllable switching transistors and two freewheeling diodes, enabling independent control of the three-phase stator windings without bridge arm shoot-through faults, resulting in simple and reliable control. While the single-channel three-phase asymmetrical half-bridge circuit requires fewer switching devices, the current flowing through them is relatively large, leading to large size and weight of the switching devices.

[0004] Switched reluctance motors can operate in two excitation modes: self-excited and separately excited. In self-excited mode, an external power supply provides initial excitation during the initial voltage build-up. After the voltage is established, the external power supply is disconnected, and the excitation energy is provided by the output capacitor. In this mode, since no external power supply is needed after voltage build-up, the system is small and efficient. In separately excited mode, the excitation voltage is always provided by an external power supply during operation. The excitation circuit and the generation circuit are independent of each other, and the excitation voltage is independent of the output voltage. Both can be adjusted independently, making control more convenient.

[0005] Regardless of the excitation mode used, the switched reluctance motor requires an external power supply for excitation during operation, and the motor controller also requires an external power supply. Summary of the Invention

[0006] The purpose of this invention is to provide a two-stage switched reluctance generator with a permanent magnet generator. The addition of a permanent magnet generator can provide excitation power for the switched reluctance generator and power for the motor controller, so that the switched reluctance motor no longer needs external power supply when generating electricity, thus reducing the weight of the system.

[0007] The power converter adopts a dual-channel three-phase asymmetrical half-bridge topology, which increases the number of switching devices required, but reduces the current flowing through each switching device by half, thereby reducing the overall size and weight of the switching devices. At the same time, it achieves redundant control, increasing the safety and reliability of the system.

[0008] The technical solution of this invention is as follows:

[0009] A two-stage switched reluctance generator with a permanent magnet generator includes: a two-stage dual-channel switched reluctance motor and a motor controller;

[0010] The two-stage dual-channel switched reluctance motor includes: a switched reluctance motor stator, a switched reluctance motor rotor, a permanent magnet stator, a permanent magnet rotor, a rotary transformer stator, a rotary transformer rotor, a main housing, end covers, a shaft, and bearings;

[0011] The main housing and end caps form a complete housing; the shaft is supported by bearings at both ends inside the housing; the stator of the switched reluctance motor is mounted on the main housing, and the stator of the permanent magnet motor and the stator of the rotary transformer are mounted on the end caps; the rotors of the switched reluctance motor, the permanent magnet motor, and the rotary transformer are all mounted on the shaft.

[0012] Furthermore, the permanent magnet generator is a rotating magnetic pole synchronous generator; the stator winding of the permanent magnet generator outputs three independent three-phase AC power supplies; one of which supplies power to the motor controller; the other two are two excitation channels: PMG-1 channel and PMG-2 channel, which provide DC excitation power to the switched reluctance motor after rectification.

[0013] Furthermore, the switched reluctance motor is a 12 / 8-pole dual-channel switched reluctance motor, with both the stator and rotor having salient pole structures; the rotor has no windings and no permanent magnets.

[0014] Each of the 12 stators is equipped with a winding; every two opposite stator windings are connected in parallel to form one phase of a channel, for a total of six phases; the six phases are grouped at intervals to form two power conversion channels: phases A1, B1, and C1 of the SRG-1 channel and phases A2, B2, and C2 of the SRG-2 channel.

[0015] Furthermore, the two three-phase AC power output channels PMG-1 and PMG-2 of the permanent magnet motor are connected to two three-phase full-bridge rectifier modules respectively through relay 1 and relay 2; the output terminals of the two three-phase full-bridge rectifier modules are connected to relay 3, and then connected to the two power conversion channels of the switched reluctance motor through relay 3.

[0016] Furthermore, the SRG-1 and SRG-2 channels of the switched reluctance motor have the same topology; each channel is a three-phase asymmetrical half-bridge topology.

[0017] The three-phase asymmetric half-bridge topology includes two three-phase full-bridges and a three-phase winding in one channel.

[0018] A three-phase full-bridge circuit consists of six IGBT modules, each of which includes one IGBT and one freewheeling diode.

[0019] Furthermore, the two three-phase full bridges of the SRG-1 channel are respectively composed of IGBT modules G1, G2, G5, G6, G9, G10 and GBT modules G3, G4, G7, G8, G11, G12;

[0020] The winding A1+ of the SRG-1 channel is connected to IGBT modules G1 and G2, and the winding A1- is connected to IGBT modules G3 and G4. By providing normal control signals to IGBT modules G1 and G4, IGBT modules G2 and G3 are forcibly turned off. Then, IGBT modules G1 and G4, together with freewheeling diodes D2 and D3 and the A1 phase winding, form an A1 phase asymmetrical half-bridge power topology. Similarly, IGBT modules G5 and G8, together with freewheeling diodes D6 and D7 and the B1 phase winding, form a B1 phase asymmetrical half-bridge power topology. IGBT modules G9 and G12, together with freewheeling diodes D10 and D11 and the C1 phase winding, form a C1 phase asymmetrical half-bridge power topology.

[0021] The two three-phase full-bridge topologies of the SRG-1 channel are the same as those of the SRG-1 channel.

[0022] Furthermore, the system includes three types of operating conditions;

[0023] Operating Condition 1: Power generation demand is P N For rated power, one permanent magnet excitation channel and one power conversion channel operate simultaneously;

[0024] Operating Condition 1: Power generation demand is One permanent magnet excitation channel and two power conversion channels operate simultaneously;

[0025] Operating Condition 1: Power generation demand is P N ~P MAX At that time, P MAX To maximize output power, both permanent magnet excitation channels and two power conversion channels operate simultaneously.

[0026] Furthermore, the first operating condition includes four working modes:

[0027] (1) Only PMG-1 and SRG-1 channels are working. Relay 1 of PMG-1 channel is turned on, relay 2 of PMG-2 channel is turned off, and relay 3 is turned on. The switching transistors of SRG-1 channel are turned on and off in sequence according to the rotor position signal and phase sequence. All switching transistors of SRG-2 channel are turned off.

[0028] (2) Only PMG-1 and SRG-2 channels are working. Relay 1 of PMG-1 channel is turned on, relay 2 of PMG-2 channel is turned off, relay 3 is turned on, the switching transistors of SRG-2 channel are turned on and off in sequence according to the rotor position signal and phase sequence, and all the switching transistors of SRG-1 channel are turned off.

[0029] (3) Only PMG-2 and SRG-1 channels are working. Relay 1 of PMG-1 channel is off, relay 2 of PMG-2 channel is on, relay 3 of PMG-2 channel is on, the switching transistors of SRG-1 channel are turned on and off in sequence according to the rotor position signal, and all the switching transistors of SRG-2 channel are turned off.

[0030] (4) Only PMG-2 and SRG-2 channels are working. Relay 1 of PMG-1 channel is off, relay 2 of PMG-2 channel is on, relay 3 of PMG-2 channel is on, the switching transistors of SRG-2 channel are turned on and off in sequence according to the rotor position signal, and all the switching transistors of SRG-1 channel are turned off.

[0031] Furthermore, the second working condition includes two working modes: (1) PMG-1, SRG-1 and SRG-2 channels are working, PMG-2 channel is not working, relay 1 of PMG-1 channel is turned on, relay 2 of PMG-2 channel is turned off, relay 3 is turned on, and the switching transistors of SRG-1 and SRG-2 channels are turned on and off in sequence according to the rotor position signal and phase sequence.

[0032] (2) When PMG-2, SRG-1 and SRG-2 channels are working, PMG-1 channel is not working. Relay 1 of PMG-1 channel is off, relay 2 of PMG-2 channel is on, relay 3 is on, and the switching transistors of SRG-1 and SRG-2 channels are turned on and off in sequence according to the rotor position signal and phase sequence.

[0033] A fault-tolerant control method for a two-stage switched reluctance generator with a permanent magnet generator, the method being used for fault-tolerant control of the system, the method comprising:

[0034] Check for faults in the two excitation channels of the permanent magnet motor: PMG-1 channel and PMG-2 channel, and the two power conversion channels of the switched reluctance motor: SRG-1 channel and SRG-2 channel.

[0035] When all channels are functioning normally without faults, the power output is P. N ~P MAX of;

[0036] When only one excitation channel fails, the relay of the failed excitation channel is disconnected, allowing other channels to operate normally, and the power output is reduced to [a certain value]. of;

[0037] When only one excitation channel and one power conversion channel fail, the relay of the faulty excitation channel is disconnected and the switching transistor of the faulty power conversion channel is turned off, controlling the other channels to operate normally, and the power output is reduced to [value missing].

[0038] The beneficial effects of this invention are:

[0039] This invention adds a permanent magnet generator stage, which can provide excitation power for the switched reluctance generator and power for the motor controller. The switched reluctance motor no longer needs an external power supply when generating electricity, thus reducing the weight of the system.

[0040] The power conversion topology of the two-stage dual-channel switched reluctance generator system consists of only four three-phase full-bridge IGBT modules, exhibiting high integration and further improving the system's power-to-weight ratio. This system enables dual-channel excitation and dual-channel power generation. It can be viewed as consisting of two three-phase switched reluctance motors, two independent permanent magnet motor excitation power supplies, and two independent power converters. Based on the power generation requirements, the system flexibly controls the necessary permanent magnet motor excitation power supply channels and power conversion channels, thereby improving system efficiency. Furthermore, when a channel fails, the faulty channel can be disconnected, achieving a fault-tolerant operating mode and enhancing system safety and reliability. Attached Figure Description

[0041] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings will be described below.

[0042] Appendix Figure 1 Schematic diagram of a two-stage dual-channel switched reluctance motor;

[0043] Appendix Figure 2 Working principle diagram of a two-stage dual-channel switched reluctance motor;

[0044] Appendix Figure 3 Power conversion topology diagram of a two-stage dual-channel switched reluctance power generation system;

[0045] Appendix Figure 4 Simplified topology diagram of a two-stage dual-channel switched reluctance power generation system;

[0046] Appendix Figure 5 Two-stage dual-channel switched reluctance power generation system output Simplified diagram of power operation principle;

[0047] Appendix Figure 6 Two-stage dual-channel switched reluctance power generation system output Simplified diagram of power operation principle;

[0048] Appendix Figure 7Two-stage dual-channel switched reluctance power generation system output (P N ~1.25P N A simplified diagram of the power operation principle. Detailed Implementation

[0049] This section describes embodiments of the present invention, used to explain and illustrate the technical solutions of the present invention.

[0050] The structure of the two-stage dual-channel switched reluctance motor is shown in the attached figure. Figure 1 As shown: the stator assembly 4 of the switched reluctance motor is installed in the main housing 3, the stator assembly 7 of the permanent magnet generator and the stator assembly 9 of the rotary transformer are installed in the end cover assembly 6, and the rotor assembly 5 of the switched reluctance generator, the rotor assembly 8 of the permanent magnet generator and the rotor assembly 10 of the rotary transformer are installed on the shaft 2 supported by bearings 1 at both ends.

[0051] The working principle of the two-stage dual-channel switched reluctance motor is shown in the attached figure. Figure 2 As shown, it consists of two independent cascaded generators:

[0052] The first-stage motor is a permanent magnet generator (PMG), which is a rotating magnetic pole synchronous generator. The rotor structure uses samarium cobalt magnets. The stator winding outputs three independent three-phase AC power. One of them provides control power to the motor controller GCU, and the other two are rectified by the motor controller to provide DC excitation power for the switched reluctance motor during power generation.

[0053] The second-stage motor is a dual-channel switched reluctance motor. Both the stator and rotor are salient pole structures, made of silicon steel sheets or other magnetically conductive materials stacked together. The rotor has no windings or permanent magnets, and is equipped with a rotary transformer for detecting position signals. The stator has concentrated windings wound on each pole.

[0054] In a 12 / 8-pole switched reluctance motor, the coils on opposite stator teeth are connected in parallel to form one phase of a channel, and the coils on the other two stator teeth perpendicular to it are connected in parallel to form another phase of a channel.

[0055] The two coils A on the opposite poles 11 and A 12 B 11 and B 12 C 11 and C 12 The phases A1, B1, and C1 of channel 1 are connected in parallel to form the other three phases.

[0056] The two coils A on the opposite poles 21 and A 22 B 21 and B 22 C 21 and C 22The phases A2, B2, and C2 of channel 2 are connected in parallel to each other.

[0057] When the coil is energized, the salient poles that are physically opposite have the same polarity, and the adjacent salient poles have opposite polarities. Under this coil energizing scheme, the magnetic field distribution of the motor is NS…NS….

[0058] The power conversion topology of the two-stage dual-channel switched reluctance generator system is shown in the attached figure. Figure 3 As shown, it mainly consists of a power conversion section, a permanent magnet motor excitation power supply section, and a power generation and filtering section. This power generation system is in self-excitation mode. The permanent magnet motor excitation power supply section only provides initial excitation during the initial instant of voltage establishment. After the voltage is established, the permanent magnet motor excitation power supply section is disconnected, and the excitation energy is provided by the output capacitor.

[0059] The power conversion section adopts a dual-channel three-phase asymmetrical half-bridge topology. Each channel's three-phase asymmetrical half-bridge topology consists of two three-phase full-bridge IGBT modules connected to a three-phase winding of one channel. A three-phase full-bridge IGBT module consists of 6 IGBT modules, and each IGBT module consists of one IGBT and one freewheeling diode.

[0060] Then, IGBT (G1) and freewheeling diode (D1) form IGBT module G1. IGBT modules G1, G2, G5, G6, G9, and G10 form a three-phase full-bridge IGBT module. Similarly, IGBT modules G3, G4, G7, G8, G11, and G12 form a three-phase full-bridge IGBT module. IGBT modules G13, G14, G17, G18, G21, and G22 form a three-phase full-bridge IGBT module. IGBT modules G15, G16, G19, G20, G23, and G24 form a three-phase full-bridge IGBT module.

[0061] Winding A1+ is connected to IGBT modules G1 and G2, and winding A1- is connected to IGBT modules G3 and G4. By providing normal control signals to IGBT modules G1 and G4, the IGBTs (G2) and (G3) of IGBT modules G2 and G3 are forcibly turned off. Then, IGBT modules G1 and G4, together with freewheeling diodes (D2) and (D3) and the A1 phase winding, form the A1 phase asymmetric half-bridge power topology.

[0062] Similarly, IGBT modules G5 and G8, along with freewheeling diodes (D6) and (D7) and the B1 phase winding, form the B1 phase asymmetric half-bridge power topology.

[0063] IGBT modules G9 and G12, along with freewheeling diodes (D10) and (D11) and the C1 phase winding, form the C1 phase asymmetric half-bridge power topology.

[0064] IGBT modules G13 and G16, along with freewheeling diodes (D14) and (D15) and the A2 phase winding, form the A2 phase asymmetric half-bridge power topology.

[0065] IGBT modules G17 and G20, along with freewheeling diodes (D18) and (D19) and the B2 phase winding, form the B2 phase asymmetric half-bridge power topology.

[0066] IGBT modules G21 and G24, along with freewheeling diodes (D22) and (D23) and the C2 phase winding, form the C2 phase asymmetric half-bridge power topology.

[0067] The A1-phase asymmetrical half-bridge topology, B1-phase asymmetrical half-bridge topology, and C1-phase asymmetrical half-bridge topology constitute the three-phase asymmetrical half-bridge topology of the SRG-1 channel, while the A2-phase asymmetrical half-bridge topology, B2-phase asymmetrical half-bridge topology, and C2-phase asymmetrical half-bridge topology constitute the three-phase asymmetrical half-bridge topology of the SRG-2 channel.

[0068] The permanent magnet generator excitation power supply consists of two permanent magnet generator three-phase windings, two three-phase full-bridge rectifier modules, and relays 1, 2, and 3. It provides dual-channel DC excitation for the dual-channel switched reluctance generator. Channel PMG-1 consists of permanent magnet generator three-phase windings (PM_A2, PM_B2, PM_C2), relay 1, and a three-phase full-bridge rectifier module; channel PMG-2 consists of permanent magnet generator three-phase windings (PM_A3, PM_B3, PM_C3), relay 2, and a three-phase full-bridge rectifier module. The generator filtering section is a CLC filter composed of inductors and capacitors, which filters the output voltage.

[0069] Example 1

[0070] The two-stage dual-channel switched reluctance power generation system has a high degree of integration, which can further improve the system power-to-weight ratio and simplify the topology to a more detailed form. Figure 4 This system enables dual-channel excitation and dual-channel power generation. It can be viewed as consisting of two three-phase switched reluctance motors, two independent permanent magnet motor excitation power supplies, and two independent power converters. Based on the power generation demand, the system flexibly controls the permanent magnet motor excitation power supply channel and the power converter channel to be connected, thereby improving system efficiency. The control logic of the two-stage dual-channel switched reluctance power generation system is as follows:

[0071] When the power generation demand is (P N When operating at rated power, only one permanent magnet motor excitation channel and one power conversion channel are required. There are four operating modes under this condition, as shown in the attached diagram. Figure 5 As shown:

[0072] (1) PMG-1 and SRG-1 channels are working, while PMG-2 and SRG-2 channels are not working. In this working mode, relay 1 of PMG-1 channel is turned on, relay 2 of PMG-2 channel is turned off, and relay 3 is turned on. The switching transistors of SRG-1 channel are turned on and off in sequence according to the rotor position signal and phase sequence. All switching transistors of SRG-2 channel are turned off.

[0073] (2) When PMG-1 and SRG-2 channels are working, PMG-2 and SRG-1 channels are not working. In this working mode, relay 1 of PMG-1 channel is turned on, relay 2 of PMG-2 channel is turned off, and relay 3 is turned on. The switching transistors of SRG-2 channel are turned on and off in sequence according to the phase sequence based on the rotor position signal, and all switching transistors of SRG-1 channel are turned off.

[0074] (3) When PMG-2 and SRG-1 channels are working, PMG-1 and SRG-2 channels are not working. In this working mode, relay 1 of PMG-1 channel is disconnected, relay 2 of PMG-2 channel is turned on, relay 3 of PMG-2 channel is turned on, the switching transistors of SRG-1 channel are turned on and off in sequence according to the rotor position signal and phase sequence, and all the switching transistors of SRG-2 channel are turned off.

[0075] (4) When PMG-2 and SRG-2 channels are working, PMG-1 and SRG-1 channels are not working. In this working mode, relay 1 of PMG-1 channel is disconnected, relay 2 of PMG-2 channel is turned on, relay 3 of PMG-2 channel is turned on, the switching transistors of SRG-2 channel are turned on and off in sequence according to the rotor position signal, and all the switching transistors of SRG-1 channel are turned off.

[0076] Example 2

[0077] When the power generation demand is At this time, one permanent magnet excitation channel and two power conversion channels are required to operate. There are two operating modes under this condition, as shown in the attached diagram. Figure 6 As shown:

[0078] (1) PMG-1, SRG-1 and SRG-2 channels are working, PMG-2 channel is not working. In this working mode, relay 1 of PMG-1 channel is turned on, relay 2 of PMG-2 channel is turned off, and relay 3 is turned on. The switching transistors of SRG-1 and SRG-2 channels are turned on and off in sequence according to the rotor position signal and phase sequence.

[0079] (2) PMG-2, SRG-1 and SRG-2 channels are working, while PMG-1 channel is not working. In this working mode, relay 1 of PMG-1 channel is off, relay 2 of PMG-2 channel is on, and relay 3 is on. The switching transistors of SRG-1 and SRG-2 channels are turned on and off in sequence according to the rotor position signal.

[0080] Example 3

[0081] When the power generation demand is P N ~1.25P N At this time, two permanent magnet excitation channels and two power conversion channels are required to operate. Under this condition, there is only one operating mode, as shown in the attached diagram. Figure 7 As shown: PMG-1, PMG-2, SRG-1 and SRG-2 channels are all working. In this working mode, relay 1 of PMG-1 channel is turned on, relay 2 of PMG-2 channel is turned on, and relay 3 of PMG-2 channel is turned on. The switching transistors of SRG-1 and SRG-2 channels are turned on and off sequentially according to the phase sequence based on the rotor position signal.

[0082] Example 4

[0083] The power supply system is an electromechanical integrated system composed of power electronic conversion devices and motors. Its power electronic devices have a high failure rate and are a weak link in reliability. The dual-channel system adopts a redundant structure in the weak link of reliability. This structure design increases the fault tolerance of the system and reduces the selection of device capacity by half. When a channel fails, the faulty channel can be cut off to realize the fault-tolerant working mode of the fault state, thereby improving the safety and reliability of the system. There are four fault-tolerant working modes: (1) If the SRG-2 channel fails, all the switches of the SRG-2 channel will be turned off, and the PMG-1, PMG-2 and SRG-1 channels will continue to work, and can still realize approximately Power output; (2) If the SRG-1 channel fails, all the switches in the SRG-1 channel will be turned off, while the PMG-1, PMG-2 and SRG-2 channels will continue to operate, and approximately Power output; (3) If the PMG-1 channel fails, relay 1 will be disconnected, and the PMG-2, SRG-1 and SRG-2 channels will continue to work and can still achieve power output. Power output; (4) If the PMG-2 channel fails, relay 2 will be disconnected, and the PMG-1, SRG-1 and SRG-2 channels will continue to work and can still achieve power output. Power output.

Claims

1. A two-stage switched reluctance generator with a permanent magnet generator, characterized in that: The generator includes: a two-stage dual-channel switched reluctance motor and a motor controller; The two-stage dual-channel switched reluctance motor includes: a switched reluctance motor stator, a switched reluctance motor rotor, a permanent magnet stator, a permanent magnet rotor, a rotary transformer stator, a rotary transformer rotor, a main housing, end covers, a shaft, and bearings; The main housing and end caps form a complete housing; the shaft is supported inside the housing by bearings at both ends; the switched reluctance motor stator is mounted on the main housing, the permanent magnet motor stator and the rotary transformer stator are mounted on the end caps; the switched reluctance motor rotor, the permanent magnet motor rotor and the rotary transformer rotor are all mounted on the shaft; The permanent magnet generator is a rotating magnetic pole synchronous generator; the stator winding of the permanent magnet generator outputs three independent three-phase AC power; one of them powers the motor controller; the other two are two excitation channels: PMG-1 channel and PMG-2 channel, which provide DC excitation power to the switched reluctance motor after rectification; The switched reluctance motor is a 12 / 8-pole dual-channel switched reluctance motor with salient pole structure for both stator and rotor; the rotor has no windings and no permanent magnets; each of the 12 stator poles is equipped with windings; every pair of opposite stator windings is connected in parallel to form one phase of a channel, for a total of six phases; the six phases are grouped at intervals to form two power conversion channels: phases A1, B1, and C1 of the SRG-1 channel and phases A2, B2, and C2 of the SRG-2 channel; The generator includes three operating conditions; Operating Condition 1: Power generation demand is 0~ , For rated power, one permanent magnet excitation channel and one power conversion channel operate simultaneously; Operating Condition 2: Power generation demand is ~ One permanent magnet excitation channel and two power conversion channels operate simultaneously; Operating Condition 3: Power generation demand is ~ hour, To maximize output power, both permanent magnet excitation channels and two power conversion channels operate simultaneously.

2. The generator according to claim 1, characterized in that: The two three-phase AC power output channels PMG-1 and PMG-2 of the permanent magnet motor are connected to two three-phase full-bridge rectifier modules through relay 1 and relay 2 respectively; the output terminals of the two three-phase full-bridge rectifier modules are connected to relay 3, and then connected to the two power conversion channels of the switched reluctance motor through relay 3.

3. The generator according to claim 2, characterized in that: The SRG-1 and SRG-2 channels of the switched reluctance motor have the same topology; each channel is a three-phase asymmetrical half-bridge topology. The three-phase asymmetric half-bridge topology includes two three-phase full-bridges and a three-phase winding in one channel. A three-phase full-bridge circuit consists of six IGBT modules, each of which includes one IGBT and one freewheeling diode.

4. The generator according to claim 3, characterized in that: The two three-phase full bridges of the SRG-1 channel are composed of IGBT modules G1, G2, G5, G6, G9, G10 and IGBT modules G3, G4, G7, G8, G11, G12, respectively. The winding A1+ of the SRG-1 channel is connected to IGBT modules G1 and G2, and the winding A1- is connected to IGBT modules G3 and G4. By providing normal control signals to IGBT modules G1 and G4, IGBT modules G2 and G3 are forcibly turned off. Then, IGBT modules G1 and G4, together with freewheeling diodes D2 and D3 and the A1 phase winding, form an A1 phase asymmetrical half-bridge power topology. Similarly, IGBT modules G5 and G8, together with freewheeling diodes D6 and D7 and the B1 phase winding, form a B1 phase asymmetrical half-bridge power topology. IGBT modules G9 and G12, together with freewheeling diodes D10 and D11 and the C1 phase winding, form a C1 phase asymmetrical half-bridge power topology. The two three-phase full-bridge topologies of the SRG-2 channel are the same as those of the SRG-1 channel.

5. The generator according to claim 4, characterized in that: The first working condition includes four working modes: (1) Only PMG-1 and SRG-1 channels are working. Relay 1 of PMG-1 channel is turned on, relay 2 of PMG-2 channel is turned off, relay 3 is turned on, the switching transistors of SRG-1 channel are turned on and off in sequence according to the rotor position signal and phase sequence, and all the switching transistors of SRG-2 channel are turned off. (2) Only PMG-1 and SRG-2 channels are working. Relay 1 of PMG-1 channel is turned on, relay 2 of PMG-2 channel is turned off, relay 3 is turned on, the switching transistors of SRG-2 channel are turned on and off in sequence according to the rotor position signal and phase sequence, and all the switching transistors of SRG-1 channel are turned off. (3) Only PMG-2 and SRG-1 channels are working. Relay 1 of PMG-1 channel is off, relay 2 of PMG-2 channel is on, relay 3 is on, the switching transistors of SRG-1 channel are turned on and off in sequence according to the rotor position signal and phase sequence, and all the switching transistors of SRG-2 channel are turned off. (4) Only PMG-2 and SRG-2 channels are working. Relay 1 of PMG-1 channel is off, relay 2 of PMG-2 channel is on, relay 3 is on, the switching transistors of SRG-2 channel are turned on and off in sequence according to the rotor position signal, and all the switching transistors of SRG-1 channel are turned off.

6. The generator according to claim 5, characterized in that: The second working condition includes two working modes: (1) PMG-1, SRG-1 and SRG-2 channels are working, PMG-2 channel is not working, relay 1 of PMG-1 channel is turned on, relay 2 of PMG-2 channel is turned off, relay 3 is turned on, and the switching transistors of SRG-1 and SRG-2 channels are turned on and off in sequence according to the rotor position signal and phase sequence. (2) When PMG-2, SRG-1 and SRG-2 channels are working, PMG-1 channel is not working. Relay 1 of PMG-1 channel is off, relay 2 of PMG-2 channel is on, relay 3 is on, and the switching transistors of SRG-1 and SRG-2 channels are turned on and off in sequence according to the rotor position signal and phase sequence.

7. A fault-tolerant control method for a two-stage switched reluctance generator with a permanent magnet generator, the method being used for fault-tolerant control of the generator according to any one of claims 1-6, characterized in that: The method includes: Check for faults in the two excitation channels of the permanent magnet motor: PMG-1 channel and PMG-2 channel, and the two power conversion channels of the switched reluctance motor: SRG-1 channel and SRG-2 channel. When all channels are functioning normally without faults, the power output is [value missing]. ~ ; When only one excitation channel fails, the relay of the failed excitation channel is disconnected, allowing other channels to operate normally, and the power output is reduced to [a certain value]. ~ ; When only one excitation channel and one power conversion channel fail, the relay of the failed excitation channel is disconnected and the switching transistor of the failed power conversion channel is turned off, allowing the other channels to operate normally, and the power output drops to 0. .

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