Switched reluctance motor driving and charging integrated system and control method

Abstract

The application discloses a switch reluctance motor driving and charging integrated system, which comprises a storage battery, a power converter, a switch reluctance motor, a rectifier bridge and a filter; the power converter is provided with a freewheeling bus on the basis of a conventional asymmetric half-bridge circuit, and a driving and charging switching transistor and a diode are additionally arranged on the original excitation bus; in the driving mode, the asymmetric half-bridge circuit normally works, the excitation loop and the freewheeling loop are separated, and the conversion from electric energy to mechanical energy is realized; in the charging mode, an external power source is connected with the excitation bus and the power converter through the filter and the rectifier bridge, DC power can be obtained after the external AC power is rectified by the rectifier bridge, the power converter of the multiplex motor is a DC converter, and the parallel interleaved boost or buck charging of the storage battery is realized. The application reduces the volume of the system, the current ripple, the current stress of the device and the switching frequency of the switching device.

Description

TECHNICAL FIELD

[0001] The present application relates to a motor system, in particular to a switched reluctance motor driving and charging integrated system and a control method. BACKGROUND

[0002] The maximum output voltage of the existing fast charging network charging pile is mostly 500V. If the in-vehicle battery pack is 800V, the voltage of the charging pile must be raised before charging the battery pack. If the maximum voltage of the charging pile has been updated to 900V or higher, and the in-vehicle battery pack is still 400V, the voltage of the charging pile needs to be reduced before charging the battery pack. In addition, fast charging technology is a major problem that needs to be solved for electric vehicle charging. When charging with single-phase alternating current, the charging power is limited and the charging time is long. To achieve fast charging, three-phase alternating current charging technology needs to be used.

[0003] The BYD E platform 2.0 uses an independent boost charging circuit, but the rated current of the circuit is large, the heat dissipation is large, and the inductance volume is large, which is a thorny problem for heat dissipation and installation space. Therefore, the BYD E platform 3.0 reuses the power devices of the motor driving system and the motor windings to form a boost charging circuit, thereby reducing the use of devices and reducing costs, and no additional heat dissipation device and installation space are required. However, the driving / charging integrated technology of the switched reluctance motor is still less studied.

[0004] Chinese invention patent CN201956913U discloses an integrated switched reluctance motor driving and charging conversion device, which includes an energy storage module and a driving module connected in series with the energy storage module, further includes a rectifier module and a control module, the control module is connected with the energy storage module, the driving module and the rectifier module respectively, and controls the work of the rectifier module according to a preset program, controls the output voltage according to different voltage systems, and realizes external power supply to the equipment during discharging, and charges the energy storage device when there is no external power supply. The disadvantage of this scheme is that three diodes and one switch tube need to be added additionally, which increases the cost and size of the device.

[0005] Chinese invention patent CN103647483A discloses a power conversion device integrated with switched reluctance motor driving and battery charging. The device uses two-phase windings and two asymmetric half-bridge topologies to realize boost and bridgeless PFC functions, i.e. the half-bridge circuit connected with the alternating current grid, and the other winding and asymmetric half-bridge topology circuit as a boost / buck converter to meet the needs of battery charging. During driving, the grid is disconnected; during charging, the grid is connected, realizing time-sharing multiplexing of driving / charging. The advantage of this device is that it does not require other additional devices, providing a power conversion device integrated with switched reluctance motor driving and battery charging, which is simple in structure, low in cost and convenient to use. The disadvantage of this scheme is that it is only suitable for three-phase and above switched reluctance motors and single-phase alternating current charging. SUMMARY

[0006] The application aims to provide a switched reluctance motor drive and charging integrated system and control method which can improve the frequency of bus current and voltage change and reduce the ripple of current and voltage.

[0007] Technical scheme: A switched reluctance motor drive and charging integrated system, the vehicle-mounted part mainly comprises a storage battery, a power converter, a switched reluctance motor, a rectifier bridge and a filter; the power converter comprises at least one set of asymmetric half-bridge circuits with separated excitation and freewheeling circuits, each set of asymmetric half-bridge circuits has the same structure, and each asymmetric half-bridge circuit is connected in parallel; wherein:

[0008] The first set of asymmetric half-bridge circuits comprises a first motor winding, a first controllable switching device, a second controllable switching device, a first diode and a second diode; one end of the first motor winding is connected with the output end of the first controllable switching device and the cathode of the first diode respectively, and the other end is connected with the input end of the second controllable switching device and the anode of the second diode respectively; the cathode of the second diode is connected with the positive electrode of the storage battery through a freewheeling bus, the positive electrode of the storage battery is connected with the input end of a drive and charging switch, and the output end of the drive and charging switch is connected with the input end of the first controllable switching device;

[0009] A voltage stabilizing capacitor is connected in parallel across the storage battery and arranged at one end of the asymmetric half-bridge, and the rectifier bridge and the filter are arranged at the other end of the asymmetric half-bridge circuit;

[0010] When the system is in the drive mode, the external power supply is not connected to the circuit, the rectifier bridge does not work, the drive and charging switch is closed, the power supply is provided by the storage battery, the power converter works in the connection mode of the asymmetric half-bridge with separated excitation and freewheeling circuits, the voltage stabilizing capacitor serves as an input filter capacitor, and the electrical energy of the storage battery is converted into mechanical energy through each motor winding;

[0011] When the system is in the charging mode, the motor stops rotating, the drive and charging switch is opened, the external power supply is connected to the circuit, and the rectifier bridge rectifies after filtering by the filter; at this time, the power converter is reused as a direct current converter, the voltage stabilizing capacitor serves as an output capacitor, and the boost or buck charging of the storage battery is realized.

[0012] Further, in the charging mode, when the external power supply is a three-phase alternating current power supply, the first terminal, the second terminal and the third terminal are connected respectively; when the external power supply is a single-phase alternating current power supply, any two of the first terminal, the second terminal and the third terminal are connected respectively; and when the external power supply is a direct current power supply, any two of the first terminal, the second terminal and the third terminal are connected or directly connected with the positive terminal and the negative terminal.

[0013] Further, the rectifier bridge is a three-phase bridge rectifier circuit or a single-phase bridge rectifier circuit.

[0014] Further, the controllable switching devices are Si or SiC controllable switching devices.

[0015] Further, the drive charging switch is a contactor, a switch blade or a power switching device; in the step-down charging mode, the drive charging switch is replaced by a diode, the input end of the diode is connected to the positive pole of the battery, and the output end is connected to the input end of the first controllable switching device.

[0016] A control method of a switched reluctance motor drive charging integrated system, used for controlling any of the above switched reluctance motor drive charging integrated systems; in the drive mode, the control method of each group of motor windings is the same, wherein when the external DC / AC power supply is not connected, the control steps of the first motor winding are as follows:

[0017] S11, the drive charging switch is closed;

[0018] S12, the first controllable switching device and the second controllable switching device are turned on, and the battery excites the first motor winding;

[0019] S13, the first controllable switching device and the second controllable switching device are turned off, and the current on the first motor winding flows through the first diode and the second diode to feed back to the battery.

[0020] Further, the control method of each group of motor windings is the same, wherein the control steps of the first motor winding in the staggered boost step-up charging mode are as follows:

[0021] S21, the drive charging switch is opened, the external power supply is connected, and the first controllable switching device, the third controllable switching device and the fifth controllable switching device remain turned on;

[0022] S22, the second controllable switching device is turned on, and the first motor winding stores energy; at this time, the voltage stabilizing capacitor charges the battery;

[0023] S23, the second controllable switching device is turned off, and the energy stored in the first motor winding flows through the second diode to charge the battery and the voltage stabilizing capacitor through the freewheeling bus, and the charging voltage is changed by adjusting the duty cycle of the second controllable switching device to match the nominal potential of the battery;

[0024] S24, the fourth controllable switching device is turned on, and the external power supply charges the second motor winding; at this time, the first motor winding continues to discharge to charge the battery and the voltage stabilizing capacitor.

[0025] Further, the control steps of the synchronous boost step-up charging mode are as follows:

[0026] S31, the drive charging switch is turned off, the external power supply is connected, the first controllable switch device, the third controllable switch device and the fifth controllable switch device remain conducting;

[0027] S32, the second controllable switch device, the fourth controllable switch device and the sixth controllable switch device are turned on, the first motor winding, the second motor winding and the third motor winding store energy; at this time, the voltage stabilizing capacitor charges the battery;

[0028] S33, the second controllable switch device, the fourth controllable switch device and the sixth controllable switch device are turned off, the energy stored in the first motor winding, the second motor winding and the third motor winding respectively flows through the second diode, the fourth diode and the sixth diode to the current continuation bus to charge the battery and the voltage stabilizing capacitor, and the duty cycle of the second controllable switch device, the fourth controllable switch device and the sixth controllable switch device is controlled to change the charging voltage and match the nominal potential of the battery.

[0029] Further, the control method of each group of motor windings is the same, and the control steps of the first motor winding in the interleaved buck step-down charging mode are as follows:

[0030] S41, the drive charging switch is turned off, and the external power supply is connected;

[0031] S42, the first controllable switch device is turned on, and the external power supply charges the first motor winding, the voltage stabilizing capacitor and the battery;

[0032] S43, the first controllable switch device is turned off, the energy stored in the first motor winding flows through the second diode to the current continuation bus to charge the battery, the voltage stabilizing capacitor is discharged, and the duty cycle of the first controllable switch device is controlled to change the charging voltage and match the nominal potential of the battery.

[0033] S44, the third controllable switch device is turned on, and the external power supply charges the second motor winding; at this time, the first motor winding and the voltage stabilizing capacitor continue to charge the battery.

[0034] Further, the control steps in the synchronous buck step-down charging mode are as follows:

[0035] S51, the drive charging switch is turned off, and the external power supply is connected;

[0036] S52, the first controllable switch device, the third controllable switch device and the fifth controllable switch device are turned on, and the external power supply charges the first motor winding, the second motor winding, the third motor winding, the voltage stabilizing capacitor and the battery;

[0037] S53, the first controllable switching device, the third controllable switching device and the fifth controllable switching device are turned off, the energy stored in the first motor winding, the second motor winding and the third motor winding respectively flows through the second diode, the fourth diode and the sixth diode to the bus for charging the battery, the voltage stabilizing capacitor is discharged, and the charging voltage is changed by regulating the duty cycle of the first controllable switching device, the third controllable switching device and the fifth controllable switching device, so that the charging voltage is matched with the nominal potential of the battery.

[0038] Compared with the prior art, the present application has the following remarkable effects:

[0039] 1. By adopting the interleaved boost / buck circuit, the variation frequency of the bus current and voltage is improved, the current and voltage ripple is reduced, and the requirements for inductance and output capacitance are further reduced.

[0040] 2. On the basis of the multiplex asymmetric half-bridge circuit, a separate bridge rectifier circuit is added, so that single-phase or three-phase AC charging and DC charging can be realized, the charging interface is rich and flexible, and multiple charging modes such as fast charging and slow charging can be provided to meet the charging needs in different application scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 The figure is a circuit schematic diagram of the present application;

[0042] Figure 2 The figure is a structural block diagram of the present application;

[0043] Fig. 3(a) is a circuit diagram of the present application in driving mode, working state 1: excitation state,

[0044] Fig. 3(b) is a circuit diagram of the present application in driving mode, working state 2: freewheeling state;

[0045] Fig. 4(a) is a circuit diagram of the present application in interleaved boost charging mode, working state 1,

[0046] Fig. 4(b) is a circuit diagram of the present application in interleaved boost charging mode, working state 2,

[0047] Fig. 4(c) is a circuit diagram of the present application in synchronous boost charging mode, working state 1,

[0048] Fig. 4(d) is a circuit diagram of the present application in synchronous boost charging mode, working state 2;

[0049] Fig. 5(a) is a circuit diagram of the present application in interleaved buck charging mode, working state 1,

[0050] Fig. 5(b) is a circuit diagram of the present application in interleaved buck charging mode, working state 2,

[0051] Figure 5(c) is a circuit diagram of the working state 1 of the application in the synchronous buck step-down charging mode,

[0052] Figure 5(d) is a circuit diagram of the working state 2 of the application in the synchronous buck step-down charging mode;

[0053] Figure 6(a) is a schematic diagram of the connection mode of the external three-phase alternating current power supply and the rectifier bridge,

[0054] Figure 6(b) is a schematic diagram of the connection mode of the external single-phase alternating current power supply and the rectifier bridge,

[0055] Figure 6(c) is a schematic diagram of the first connection mode of the external direct current power supply and the rectifier bridge,

[0056] Figure 6(d) is a schematic diagram of the second connection mode of the external direct current power supply and the rectifier bridge;

[0057] Figure 7(a) is a schematic diagram of the boost basic circuit,

[0058] Figure 7(b) is a schematic diagram of the buck basic circuit. DETAILED DESCRIPTION

[0059] The application will be further described in detail below in combination with the drawings and specific embodiments.

[0060] The application provides a switched reluctance motor driving / charging integrated system for electric vehicles, which is suitable for various application occasions such as plug-in high-power hybrid electric vehicles driven by switched reluctance motors. The driving mode and the charging mode are switched through the additional switching switch. The control of the driving mode has no essential difference from the control of the general switched reluctance motor asymmetric half-bridge circuit; the direct current converter in the charging mode reuses the phase windings of the switched reluctance motor and the power devices in the driving system to form a boost step-up or buck step-down charging circuit. Meanwhile, the addition of the rectifier bridge can realize direct current charging and single-phase or three-phase alternating current charging, and the power of the three-phase alternating current charging is greater than that of the single-phase alternating current charging, which can meet the demand of fast charging. Through the reuse of the windings and the system power devices, the volume and cost of the entire electric and charging integrated system can be greatly reduced. The three-phase parallel direct current converter reduces the current burden of the components and also reduces the heating of the single inductor, thereby improving the system redundancy backup capability. Through the adoption of the interleaved boost step-up / buck step-down circuit, the variation frequency of the input and output currents and voltages is improved, the current and voltage ripples are reduced, and the requirements for the inductor and output capacitor are further reduced.

[0061] The switched reluctance motor drive and charging integrated system provided by the present invention can be used in the field of electric vehicles. Its main circuit includes a battery, a voltage-stabilizing capacitor, a power converter, a switched reluctance motor, a rectifier bridge, and a filter.

[0062] like Figure 1 The illustrated switched reluctance motor drive and charging integrated system has an onboard portion that primarily includes a battery, a power converter, a switched reluctance motor, a rectifier bridge, and a filter. The power converter of the system of the present invention adds a freewheeling busbar to the traditional switched reluctance motor asymmetric half-bridge drive circuit, separating the excitation busbar from the freewheeling busbar. At the same time, a drive charging switch K1 is added to the original excitation busbar, and the drive and charging modes are switched by controlling the drive charging switch K1. The power converter is composed of an asymmetric half-bridge circuit with separated excitation and freewheeling circuits, motor windings, a drive charging switch K1, and a voltage stabilizing capacitor C1, wherein:

[0063] Taking phase A as an example, the asymmetric half-bridge circuit includes a first motor winding A, a first controllable switch Q1, a second controllable switch Q2, a first diode D1, and a second diode D2. One end of the first motor winding A is connected to the output of the first controllable switch Q1 and the cathode of the first diode D1, respectively, and the other end is connected to the input of the second controllable switch Q2 and the anode of the second diode D2, respectively. The cathode of the second diode D2 is connected to the positive electrode of the battery via a freewheeling busbar. The positive electrode of the battery is connected to the input of the drive charging switch K1, and the output of the drive charging switch K1 is connected to the input of the first controllable switch Q1. The circuit structure of motor winding phases B and C is the same as that of phase A. A voltage-stabilizing capacitor C1 is connected in parallel across the battery and is located at one end of the asymmetric half-bridge circuit. The rectifier bridge and filter are located at the other end of the asymmetric half-bridge circuit.

[0064] When the system is in drive mode, the external power supply is not connected to the circuit, the rectifier bridge does not work, the drive charging switch K1 is closed, and the battery is used for power supply. The power converter operates in an asymmetric half-bridge connection mode with the excitation circuit and the freewheeling circuit separated. The voltage stabilizing capacitor C1 serves as the input filter capacitor, and the battery's electrical energy is converted into mechanical energy through the motor winding.

[0065] When the system is in charging mode, the motor stops rotating, the driving charging switch K1 is disconnected, the external power supply is connected to the circuit, the filter is filtered, and the rectifier bridge is used for rectification. At this time, the power converter is reused as a DC converter, and the voltage stabilizing capacitor C1 is used as the output capacitor to realize boost or buck charging of the battery, such as Figure 2 shown.

[0066] The specific implementation steps of the control method of the switched reluctance motor drive charging integrated system of the present invention are as follows:

[0067] The control steps in the driving mode are as follows, taking phase A as an example:

[0068] 11) Select the driving mode, drive the charging switch K1 to close, and the controller outputs the control signal of the switch tube according to the given motor speed, phase current and rotor position;

[0069] 12) The first controllable switching device Q1 and the second controllable switching device Q2 are turned on, and the battery excites the first motor winding A, as shown in FIG. 3(a);

[0070] 13) The first controllable switching device Q1 and the second controllable switching device Q2 are turned off, and since the inductive current on the first motor winding A cannot be abruptly changed, the current on the first motor winding A flows through the first diode D1 and the second diode D2 to feed back to the battery, as shown in FIG. 3(b).

[0071] The control steps in the interleaved boost charging mode are as follows, taking phase A as an example:

[0072] 21) Select the charging mode, drive the charging switch K1 to open, and the first controllable switching device Q1, the third controllable switching device Q3 and the fifth controllable switching device Q5 are turned on, and the controller outputs the control signal of the switch tube according to the motor phase current, bus voltage and bus current signals;

[0073] 22) The second controllable switching device Q2 is turned on, and the external power supply charges the first motor winding A; at this time, the voltage stabilizing capacitor C1 charges the battery, as shown in FIG. 4(a);

[0074] 23) The second controllable switching device Q2 is turned off, and the energy stored in the first motor winding A flows through the freewheeling bus to charge the battery and the voltage stabilizing capacitor C1 through the second diode D2, and the charging voltage is changed by adjusting the duty cycle of the second controllable switching device Q2 to match the nominal potential of the battery, as shown in FIG. 4(b);

[0075] 24) The fourth controllable switching device Q4 is turned on, and the external power supply charges the second motor winding B; at this time, the first motor winding A continues to discharge to charge the battery and the voltage stabilizing capacitor C1.

[0076] The control steps in the synchronous boost charging mode are as follows:

[0077] 31) Select the charging mode, drive the charging switch K1 to open, and the first controllable switching device Q1, the third controllable switching device Q3 and the fifth controllable switching device Q5 are turned on, and the controller outputs the control signal of the switch tube according to the motor phase current, bus voltage and bus current signals;

[0078] 32) The second controllable switching device Q2, the fourth controllable switching device Q4 and the sixth controllable switching device Q6 are turned on, and the external power source charges each motor winding (A, B, C); at this time, the voltage stabilizing capacitor C1 charges the battery, as shown in 4(c);

[0079] 33) The second controllable switching device Q2, the fourth controllable switching device Q4 and the sixth controllable switching device Q6 are turned off, and the energy stored in each motor winding (A, B, C) flows through the freewheeling bus to charge the battery and the voltage stabilizing capacitor C1 through the second diode D2, and the charging voltage is changed by regulating the duty cycle of the controllable switching device (Q2, Q4, Q6), which matches the nominal potential of the battery, as shown in 4(d).

[0080] The control steps in the interleaved buck step-down charging mode are as follows, taking the A phase as an example:

[0081] 41) Select the charging mode, drive the charging switch K1 to be off, and the controller outputs the control signal of the switch tube according to the phase current of the motor, the bus voltage and the bus current signal;

[0082] 42) The first controllable switching device Q1 is turned on, and the external power source charges the first motor winding A, the voltage stabilizing capacitor C1 and the battery, as shown in 5(a);

[0083] 43) The first controllable switching device Q1 is turned off, and the energy stored in the first motor winding A flows through the freewheeling bus to charge the battery and the voltage stabilizing capacitor C1 through the second diode D2, and the charging voltage is changed by regulating the duty cycle of the first controllable switching device Q1, which matches the nominal potential of the battery, as shown in 5(b);

[0084] 44) The third controllable switching device Q3 is turned on, and the external power source charges the second motor winding B, the voltage stabilizing capacitor C1 and the battery; at this time, the first motor winding A continues to charge the battery.

[0085] The control steps in the synchronous buck step-down charging mode are as follows:

[0086] 51) Select the charging mode, drive the charging switch K1 to be off, and the controller outputs the control signal of the switch tube according to the phase current of the motor, the bus voltage and the bus current signal;

[0087] 52) The first controllable switching device Q1, the third controllable switching device Q3 and the fifth controllable switching device Q5 are turned on, and the external power source charges each motor winding (A, B, C), the voltage stabilizing capacitor C1 and the battery, as shown in 5(c);

[0088] 53) The first controllable switching device Q1, the third controllable switching device Q3, the fifth controllable switching device Q5 are off, the energy stored in each motor winding (A, B, C) flows through the freewheeling bus to charge the battery and the voltage stabilizing capacitor C1, by regulating the duty cycle of the first controllable switching device Q1, the third controllable switching device Q3, the fifth controllable switching device Q5, the charging voltage is changed, and the nominal potential of the battery is matched, as shown in 5(d).

[0089] Fig. 6(a) is a connection mode of a three-phase alternating current power supply and the switch reluctance motor drive charging integrated system in the present example.

[0090] Fig. 6(b) is one of the connection modes of a single-phase alternating current power supply and the switch reluctance motor drive charging integrated system in the present example, any two of P1, P2, P3 can be connected with the single-phase alternating current power supply.

[0091] Fig. 6(c) is a first connection mode of a direct current power supply and the switch reluctance motor drive charging integrated system in the present example.

[0092] Fig. 6(d) is a second connection mode of a direct current power supply and the switch reluctance motor drive charging integrated system in the present example, which can reduce the additional loss caused by the rectifier bridge.

[0093] Fig. 7(a) is a schematic diagram of a boost basic circuit.

[0094] Fig. 7(b) is a schematic diagram of a buck basic circuit.

[0095] Obviously, the above embodiments are only examples for clearly illustrating, but not limit the embodiments. For those skilled in the art, on the basis of the above description, other different forms of changes or variations can also be made. Here, it is not necessary and impossible to enumerate all the embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A switched reluctance motor drive charging integrated system, characterized by, The vehicle-mounted part mainly comprises a storage battery, a power converter, a switched reluctance motor, a rectifier bridge, and a filter; the power converter comprises at least one set of asymmetric half-bridge circuits with separated excitation and freewheeling loops, each set of asymmetric half-bridge circuits has the same structure, and each asymmetric half-bridge circuit is connected in parallel; wherein: The first asymmetric half-bridge comprises a first motor winding (A), a first controllable switching device (Q1), a second controllable switching device (Q2), a first diode (D1), and a second diode (D2); one end of the first motor winding (A) is connected with the output end of the first controllable switching device (Q1) and the cathode of the first diode (D1) respectively, and the other end is connected with the input end of the second controllable switching device (Q2) and the anode of the second diode (D2) respectively; the cathode of the second diode (D2) is connected with the positive electrode of the storage battery through a freewheeling bus, the positive electrode of the storage battery is connected with the input end of a driving charging switch (K1), and the output end of the driving charging switch (K1) is connected with the input end of the first controllable switching device (Q1); A parallel voltage stabilizing capacitor (C1) is arranged at one end of the asymmetric half-bridge, and the rectifier bridge and the filter are arranged at the other end of the asymmetric half-bridge circuit; When the system is in the driving mode, the external power supply is not connected to the circuit, the rectifier bridge does not work, the driving charging switch (K1) is closed, the power is supplied by the storage battery, the power converter works in the asymmetric half-bridge connection mode with separated excitation and freewheeling loops, the voltage stabilizing capacitor (C1) serves as an input filter capacitor, and the electrical energy of the storage battery is converted into mechanical energy through each motor winding; When the system is in the charging mode, the motor stops rotating, the driving charging switch (K1) is disconnected, the external power supply is connected to the circuit, and the rectifier bridge rectifies after filtering; at this time, the power converter is reused as a direct current converter, the voltage stabilizing capacitor (C1) serves as an output capacitor, and the boost or buck charging of the storage battery is realized.

2. The switched reluctance motor drive and charging integrated system of claim 1, wherein, In the charging mode, when the external power supply is a three-phase alternating current power supply, the first terminal (P1), the second terminal (P2), and the third terminal (P3) are connected respectively; when the external power supply is a single-phase alternating current power supply, any two of the first terminal (P1), the second terminal (P2), and the third terminal (P3) are connected respectively; when the external power supply is a direct current power supply, any two of the first terminal (P1), the second terminal (P2), and the third terminal (P3) are connected respectively or directly connected with the positive terminal (P) and the negative terminal (N).

3. The switched reluctance motor drive and charging integrated system of claim 1, wherein, The rectifier bridge is a three-phase bridge rectifier circuit or a single-phase bridge rectifier circuit.

4. The switched reluctance motor drive and charging integrated system of claim 1, wherein, Each controllable switching device is a Si or SiC controllable switching device.

5. The switched reluctance motor drive and charging integrated system of claim 1, wherein, The driving charging switch (K1) is a contactor, a switch blade, or a power switching device; in the buck charging mode, the driving charging switch (K1) is replaced by a diode, the input end of the diode is connected with the positive electrode of the storage battery, and the output end is connected with the input end of the first controllable switching device (Q1).

6. A control method of a switched reluctance motor drive charging integrated system, characterized by, The application is used for controlling the switched reluctance motor driving and charging integrated system as claimed in any one of claims 1-5. In the driving mode, the control method of each group of motor windings is the same. When the external DC / AC power supply is not connected, the control steps of the first motor winding (A) are as follows: S11, drive the charging switch K1 to be closed; S12, the first controllable switching device Q1 and the second controllable switching device Q2 are turned on, and the battery excites the first motor winding (A); S13, the first controllable switching device Q1 and the second controllable switching device Q2 are turned off, and the current on the first motor winding (A) flows back to the battery through the first diode D1 and the second diode D2; When it is the charging mode, the motor stops rotating, the charging switch K1 is turned off, the external power supply is connected to the circuit, and after filtering, the rectification bridge is rectified. At this time, the power converter is multiplexed as a DC converter, the voltage stabilizing capacitor C1 is used as an output capacitor, and the battery boost or buck charging is realized.

7. The control method of the switched reluctance motor drive charging integrated system according to claim 6, wherein The control steps of the first motor winding (A) in the staggered boost charging mode are as follows: S21, drive the charging switch K1 to be turned off, connect the external power supply, and keep the first controllable switching device Q1, the third controllable switching device Q3, and the fifth controllable switching device Q5 turned on; S22, turn on the second controllable switching device Q2, and store energy in the first motor winding (A); at this time, the voltage stabilizing capacitor C1 charges the battery; S23, turn off the second controllable switching device Q2, and the energy stored in the first motor winding (A) flows through the freewheeling bus to charge the battery and the voltage stabilizing capacitor C1, and the charging voltage is changed by adjusting the duty cycle of the second controllable switching device Q2 to match the nominal potential of the battery; S24, turn on the fourth controllable switching device Q4, and the external power supply charges the second motor winding (B); at this time, the first motor winding (A) continues to discharge to charge the battery and the voltage stabilizing capacitor C1.

8. The control method of the switched reluctance motor drive charging integrated system according to claim 6, wherein The control steps of the synchronous boost charging mode are as follows: S31, drive the charging switch K1 to be turned off, connect the external power supply, and keep the first controllable switching device Q1, the third controllable switching device Q3, and the fifth controllable switching device Q5 turned on; S32, turn on the second controllable switching device Q2, the fourth controllable switching device Q4, and the sixth controllable switching device Q6, and store energy in the first motor winding (A), the second motor winding (B), and the third motor winding (C); at this time, the voltage stabilizing capacitor C1 charges the battery; S33, the second controllable switching device (Q2), the fourth controllable switching device (Q4), the sixth controllable switching device (Q6) are turned off, the energy stored in the first motor winding (A), the second motor winding (B), the third motor winding (C) flows through the second diode (D2), the fourth diode (D4), the sixth diode (D6) through the freewheeling bus to charge the battery and the voltage stabilizing capacitor (C1), by regulating the duty cycle of the second controllable switching device (Q2), the fourth controllable switching device (Q4), the sixth controllable switching device (Q6) to change the charging voltage, match the nominal potential of the battery.

9. The control method of the switched reluctance motor drive charging integrated system according to claim 6, wherein, The control method of each group of motor windings is the same, wherein the control steps of the first motor winding (A) in the interleaved buck step-down charging mode are as follows: S41, the charging switch (K1) is driven to be turned off, and the external power supply is connected; S42, the first controllable switching device (Q1) is turned on, and the external power supply charges the first motor winding (A), the voltage stabilizing capacitor (C1) and the battery; S43, the first controllable switching device (Q1) is turned off, the energy stored in the first motor winding (A) flows through the freewheeling bus to charge the battery through the second diode (D2), and the voltage stabilizing capacitor (C1) is discharged, and the charging voltage is changed by regulating the duty cycle of the first controllable switching device (Q1), and matches the nominal potential of the battery; S44, the third controllable switching device (Q3) is turned on, and the external power supply charges the second motor winding (B); at this time, the first motor winding (A) and the voltage stabilizing capacitor (C1) continue to charge the battery.

10. The control method of the switched reluctance motor drive charging integrated system according to claim 6, wherein The control steps in the synchronous buck step-down charging mode are as follows: S51, the charging switch (K1) is driven to be turned off, and the external power supply is connected; S52, the first controllable switching device (Q1), the third controllable switching device (Q3), and the fifth controllable switching device (Q5) are turned on, and the external power supply charges the first motor winding (A), the second motor winding (B), the third motor winding (C), the voltage stabilizing capacitor (C1) and the battery; S53, the first controllable switching device (Q1), the third controllable switching device (Q3), and the fifth controllable switching device (Q5) are turned off, the energy stored in the first motor winding (A), the second motor winding (B), and the third motor winding (C) flows through the second diode (D2), the fourth diode (D4), and the sixth diode (D6) through the freewheeling bus to charge the battery, and the voltage stabilizing capacitor (C1) is discharged, and the charging voltage is changed by regulating the duty cycle of the first controllable switching device (Q1), the third controllable switching device (Q3), and the fifth controllable switching device (Q5), and matches the nominal potential of the battery.

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