Nine-switch four-port electric energy router

Abstract

The invention discloses a nine-switch four-port electric energy router, and belongs to the technical field of electric energy voltage conversion. The main circuit mainly comprises four output ports, namely a three-phase voltage port, a single-phase voltage port, a high-voltage direct-current port and a low-voltage direct-current port, nine power switch tubes, namely S1, S2, S3... S9 and the like, and when the three-phase ports are connected to a three-phase power supply, the three-phase input ends Va, Vb and Vc are connected to three boost inductors La, Lb and Lc. In a rectification mode, the energy flow direction can be from three-phase alternating current Va, Vb and Vc to a single-phase output port Vac and high-voltage direct current and low-voltage direct current ports Vdc1 and Vdc2, and in an inversion mode, the energy flow direction can be from the high-voltage direct current port Vdc1 to the single-phase output port Vac and the three-phase alternating current Va, Vb and Vc and the low-voltage direct current port Vdc2. The multi-port energy router can realize the function of converting various voltage types, and the purpose of the energy router is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric energy voltage conversion, and in particular to a nine-switch four-port electric energy router. Background Art

[0002] Today, electric vehicles are developing rapidly, and three-phase voltage, single-phase voltage, low-voltage DC and high-voltage DC are required in electric vehicles. In addition, solar photovoltaic panels can also be used as high-voltage DC input, and can output three voltages (three-phase AC, single-phase AC, DC) for direct use. The multi-port energy router is a high-performance multi-port converter. This topology adopts a nine-switch back-to-back main topology, but it is used in the field of voltage level and voltage type conversion. This topology has the advantage of using the least switch tubes to complete the energy transmission of four ports. The voltage levels and types include three-phase AC 220V, single-phase 220V, high-voltage DC 750V, and low-voltage DC 48V. It can be applied to the internal needs of electric vehicles, such as three-phase voltage can carry three-phase motors, DC 750V is the battery voltage of electric vehicles, 48V can be used for auxiliary power supply inside the car, and single-phase can be used for household electricity. And low-voltage DC can be adjusted within 0~76V, which can be widely used in industrial electricity or household electricity.

[0003] The multi-port energy router is a newly proposed topology. Due to the limitation of switch tube reuse and the diversity of voltage types and voltage levels, it is necessary to combine and use the traditional dq decoupling control, the limit control of the nine-switch converter and the DC voltage duty cycle control. Summary of the invention

[0004] The purpose of the present invention is to develop existing electric vehicles and photovoltaic energy. The nine-switch four-port power router provided by the present invention can realize the supply of multiple voltage requirements in one topology. When used in electric vehicles, the volume is greatly reduced; in photovoltaic energy, energy conversion is realized, and DC power is converted into three-phase electric vehicle charging, household electricity and low-voltage DC equipment charging.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A nine-switch four-port power router, four output ports, namely a three-phase voltage port, a single-phase voltage port, a high-voltage DC port and a low-voltage DC port, nine power switch tubes, namely S1 to S9, wherein S1, S2 and S3 correspond to the A-phase bridge arm, S4, S5 and S6 correspond to the B-phase bridge arm, and S7, S8 and S9 correspond to the C-phase bridge arm;

[0007] The high voltage DC port is V dc1 , port by C dc1 With R dc1The loads are connected in parallel or connected to a 750V DC source input. When it is a load, its rated voltage is 750V, which can be used to charge high-voltage new energy buses;

[0008] The low voltage DC port is V dc2 , port by C dc2 , L dc2 and R dc2 The load consists of dc2 , R dc2 In parallel with L dc2 Connect in series; its rated voltage is 48V, which can be used for charging vehicle power supply or other DC devices;

[0009] The single-phase AC port is V ac , port by C ac , L ac and R ac The load consists of ac , R ac In parallel with L ac ; Its rated voltage is 220V, which can be used for household electricity or 220V rated AC input equipment;

[0010] When the three-phase port is connected to a three-phase power supply, V a 、V b and V c The three-phase input terminal is connected to the three-phase inductor L a , L b and L c When three boost inductors are connected to a three-phase load, the load on phase A is L a , C a and R a Composition, and C a , R a In parallel with L a Series connection; B phase load is connected by L b , C b and R b Composition, and C b , R b In parallel with L b Series connection; C phase load is connected by L c , C c and R c Composition, and C c , R c In parallel with L c Series connection; the rated output of each phase is 220V AC, which can be used for three-phase motors;

[0011] The energy flow direction of the rectification mode can be three-phase AC V a 、V b and V c To the single-phase output port Vac and high voltage DC and low voltage DC ports V dc1 and V dc2 , when the inverter mode energy flow direction can be high voltage DC port V dc1 To the single-phase output port V ac And three-phase AC V a 、V b 、V c and low voltage DC port V dc2 , used to realize the function of a multi-port energy router.

[0012] Furthermore, the multi-port energy router includes two working modes;

[0013] Among them, working mode 1 is rectification mode, V dc1 The high-voltage DC port is used as input and connected to a DC 750V. The S1 switch tube source level of the A-phase bridge arm outputs the A-phase voltage and the single-phase voltage by modulating the multiplexed switch tube. The S4 switch tube source level of the B-phase bridge arm outputs the B-phase voltage and the single-phase voltage by modulating the multiplexed switch tube. The S7 switch tube source level of the C-phase bridge arm outputs the C-phase voltage and the low-voltage DC voltage by modulating the multiplexed switch tube.

[0014] Taking the A-phase bridge arm as an example, there are two switch tubes turned on at each moment, namely S1 and S2, S1 and S3, S2 and S3 are turned on; when S1 and S2 are turned on, it is the positive half cycle of phase A and single phase, V dc1 (750V) to La, L ac and C ac Charging; when S1 and S3 are connected, it is the positive half cycle of phase A and the negative half cycle of single phase, V dc1 (750V) charges La, L ac and C ac After discharge and reverse charging; when S2 and S3 are on, it is the negative half cycle of phase A and single phase, La, L ac and C ac After discharge and reverse charging; phase B is similar to phase A;

[0015] C bridge arm is connected to low voltage DC port V dc2 , which is different from phase A and phase B, two switch tubes are turned on at any time, namely S7 and S8, S7 and S9, S8 and S9; when S7 and S8 are turned on, phase C is in the positive half period, and the low voltage DC V dc2 In buck charging state, V dc1 (750V) to La, L dc2 and C dc2 Charge;

[0016] Working mode 2 is the inverter mode, which uses the three-phase ports of Va, Vb and Vc as input, and rectifies the three-phase voltage into a high-voltage DC V through modulation multiplexing. dc1 (750V), and convert the 750V DC into a single-phase 220V through modulation, and step down the 750V to a 48V DC output;

[0017] Similar to phase B, taking phase A as an example, at any time, two switch tubes are turned on, namely S1 and S2, S1 and S3, S2 and S3 are turned on; when S1 and S2 are turned on, it is the positive half cycle of phase A and single phase, and phase A is turned to single phase L ac and C ac and high voltage DC V dc1 With C dc1 Charging; when S1 and S3 are turned on, phase A is in the positive half cycle and the single-phase negative half cycle, and phase A is charged to the high voltage DC V dc1 With C dc1 Charging, L ac and C ac Discharge; when S2 and S3 are on, it is the negative half cycle of phase A and single phase, and the high voltage DC port C dc1 To R dc1 Discharge, single-phase AC port L ac and C ac discharge;

[0018] Taking phase C as an example, at any time, two switching tubes are turned on, namely S7 and S8, S7 and S9, S8 and S9. When S7 and S8 are turned on, it is the positive half cycle of phase C and single phase, and the voltage of phase C is positive to the high voltage DC C. dc1 With R dc1 Charging, the high-voltage DC port is rectified to 750V, and the high-voltage DC is sent to L dc1 , C dc1 and R dc1 Charging; when S7 and S9 are turned on, phase C is in the positive half cycle, and the voltage of phase C is dc1 With R dc1 Charging, low voltage port L dc2 To C dc2 Freewheeling discharge; when S8 and S9 are turned on, phase C is in the negative half cycle, and the high voltage DC port C dc1 To R dc1 Discharge, low voltage DC port L dc2 To C dc2 Follow-on discharge.

[0019] Furthermore, the multi-port energy router further includes a first control module and a second control module;

[0020] Among them, the first control module: controls the MOSFET power tube S 1、Turning on and off of S2, S3, S4, S5, S6 and S7;

[0021] The second control module: controls the on and off of the MOSFET power tube S8 and the MOSFET power tube S9.

[0022] Furthermore, the first control module controls the MOSFET power tube S 1、 The method of turning on and off S2, S3, S4, S5, S6 and S7 is:

[0023] Taking the rectification mode as an example, the first control is: outputting the DC voltage V by sampling dc1 With DC voltage reference value V dc1 * Make a difference to get the first difference ΔV dc1 , ΔV dc1 After passing through the first PI proportional-integral controller PI1, the d-axis component decoupled from the three-phase input current dq is subtracted, and after passing through the PI proportional-integral controller PI2 of the current loop, a modulation index of 0.83 is added to obtain Ud; the negative Iq component enters the PI proportional-integral controller of the current loop, and then is inverted to obtain Uq, and Ud and Uq are converted into three-phase abc coordinates. After adding / subtracting the DC bias, the control pulses of MOSFET power tubes S1, S3, S4, S6 and S7 are compared with the carrier; the control pulses of S1 and S3 are inverted and added to obtain the control pulses of S2 and S5.

[0024] Furthermore, the second control module includes a DC voltage frequency reduction unit, a voltage outer loop DQ decoupling control unit, a current inner loop control unit and SPWM which are connected in sequence.

[0025] Furthermore, the input end of the DC voltage frequency reduction unit is used as the input end of the second control module, and the second control module is connected to the DC voltage frequency reduction unit through V dc2 With DC voltage reference value V dc2 *After the difference is made, it enters the PI proportional-integral controller to obtain the duty cycle of the low-voltage DC buck, and then compared with the carrier to obtain the control pulses of S8 and S9, which can respectively obtain the control pulses of MOSFET power tube S8 and MOSFET power tube S9.

[0026] Furthermore, the input end of the DC voltage frequency reduction unit receives the output DC voltage V dc1 With DC voltage reference value V dc1 *ΔV obtained by subtraction dc1 The input end of the DC voltage frequency reduction unit receives the output DC voltage V dc2 With DC voltage reference value V dc2 *ΔV obtained by subtraction dc2 , the ΔV dc1 and ΔV dc2After passing through the PI loop, the control pulse is compared with the carrier.

[0027] The beneficial effects of the present invention are:

[0028] (1) Two control units are set up to control nine MOSFET power tubes, so that the multi-port energy router can have two working modes;

[0029] (2) By combining traditional dq decoupling control, the limit control of the nine-switch converter and the DC voltage duty cycle control, a multi-port energy router can realize the function of converting multiple voltage types, thus achieving the purpose of the energy router;

[0030] (3) It has all the voltage levels and types used and required by electric vehicles, and can be applied to household photovoltaic energy storage, and is widely used. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the rectification mode structure of the multi-port energy router provided by the present invention;

[0032] Figure 2 This is a schematic diagram of the inverter mode structure of the multi-port energy router provided by the present invention;

[0033] Figure 3 is a schematic diagram of the structure 1 of the first control unit;

[0034] Figure 4 is a schematic diagram of the structure 2 of the first control unit;

[0035] Figure 5 is a schematic structural diagram of a second control unit;

[0036] Figure 6 The voltage diagram of the multi-port energy router rectifier mode simulation test port provided by the present invention (a) is the overall output voltage diagram, and (b) is the output voltage detail diagram;

[0037] Figure 7 This is a simulation diagram of the input current waveform of the inverter mode of the multi-port energy router provided by the present invention;

[0038] Figure 8 This is a voltage diagram of the inverter mode simulation test port of the multi-port energy router provided by the present invention, (a) is the overall output voltage diagram, and (b) is the output voltage detail diagram. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0040] See also Figure 1 In one embodiment of the present invention, a nine-switch four-port power router is provided. It has four output ports, namely a three-phase voltage port, a single-phase voltage port, a high-voltage DC port, and a low-voltage DC port, and nine power switch tubes, namely S1, S2, S3...S9, etc., where S1, S2 and S3 correspond to the A-phase bridge arm, S4, S5 and S6 correspond to the B-phase bridge arm, and S7, S8 and S9 correspond to the C-phase bridge arm;

[0041] The high voltage DC port is V dc1 , port by C dc1 With R dc1 The loads are connected in parallel or connected to a DC source with a 750V input. When it is a load, its rated voltage is 750V, which can be used to charge high-voltage new energy buses.

[0042] The low voltage DC port is V dc2 , port by C dc2 , L dc2 With R dc2 The load consists of dc2 , R dc2 In parallel with L dc2 Connect in series. Its rated voltage is 48V, which can be used for charging vehicle power supply or other DC devices.

[0043] Single-phase AC port is V ac , port by C ac , L ac With R ac The load consists of ac , R ac In parallel with L ac Its rated voltage is 220V, which can be used for household electricity or 220V rated AC input equipment.

[0044] When the three-phase port is connected to a three-phase power supply, V a 、V b and V c The three-phase input terminal is connected to the three-phase inductor L a , L b and L c When three boost inductors are connected to a three-phase load, the load on phase A is L a , C a and R a Composition, and Ca , R a In parallel and in series with La. The B phase load is L b , C b and R b Composition, and C b , R b In parallel with L b The C phase load is connected in series by L c , C c and R c Composition, and C c , R c In parallel with L c Series connection. The rated output of each phase is 220V AC, which can be used for three-phase motors.

[0045] In rectification mode, the energy flow direction can be from three-phase AC Va, Vb and Vc to single-phase output port V ac and high voltage DC and low voltage DC ports V dc1 and V dc2 , when the inverter mode energy flow direction can be high voltage DC port V dc1 To the single-phase output port V ac And three-phase AC Va, Vb, Vc and low-voltage DC port V dc2 , realizing the function of a multi-port energy router.

[0046] In this embodiment, the multi-port energy router also includes 2 working modes;

[0047] Working mode 1 is rectification mode. Figure 1 As shown, the three-phase ports of Va, Vb and Vc are used as input, and the three-phase voltage is rectified into a high-voltage DC V through modulation multiplexing. dc1 (750V), and convert the 750V DC into single-phase 220V through modulation, and step down the 750V to 48V DC output.

[0048] Similarly, similar to phase B, taking phase A as an example, at each moment, two switching tubes are turned on, namely S1 and S2, S1 and S3, and S2 and S3. When S1 and S2 are turned on, it is the positive half cycle of phase A and single phase, and phase A is turned to single phase L ac and C ac and high voltage DC V dc1 With C dc1 Charging; when S1 and S3 are turned on, phase A is in the positive half cycle and the single-phase negative half cycle, and phase A is charged to the high voltage DC V dc1 With C dc1 Charging, L ac and C ac Discharge; when S2 and S3 are on, it is the negative half cycle of phase A and single phase, and the high voltage DC port C dc1 To Rdc1 Discharge, single-phase AC port L ac and C ac Discharge.

[0049] Taking phase C as an example, two switching tubes are turned on at each moment, namely S7 and S8, S7 and S9, S8 and S9. When S7 and S8 are turned on, it is the positive half cycle of phase C and single phase, and the voltage of phase C is positive to the high voltage DC C. dc1 With R dc1 Charging, the high-voltage DC port is rectified to 750V, and the high-voltage DC is sent to L dc1 , C dc1 and R dc1 When S7 and S9 are turned on, phase C is in the positive half cycle, and the voltage of phase C is dc1 With R dc1 Charging, low voltage port L dc2 To C dc2 When S8 and S9 are turned on, phase C is in the negative half cycle, and the high voltage DC port C dc1 To R dc1 Discharge, low voltage DC port L dc2 To C dc2 Follow-on discharge.

[0050] See also Figure 2 , working mode 2 is the inverter mode: V dc1 The high-voltage DC port is used as input and connected to 750V DC. By modulating the multiplexed switch tube, the S1 switch tube source level of the A-phase bridge arm outputs the A-phase voltage and the single-phase voltage. By modulating the multiplexed switch tube, the S4 switch tube source level of the B-phase bridge arm outputs the B-phase voltage and the single-phase voltage. By modulating the multiplexed switch tube, the S7 switch tube source level of the C-phase bridge arm outputs the C-phase voltage and the low-voltage DC voltage.

[0051] Taking the A-phase bridge arm as an example, there are two switch tubes turned on at each moment, namely S1 and S2, S1 and S3, and S2 and S3. When S1 and S2 are turned on, it is the positive half cycle of the A-phase and single-phase, V dc1 (750V) to L a , L ac and C ac Charging; when S1 and S3 are connected, it is the positive half cycle of phase A and the negative half cycle of single phase, V dc1 (750V) charges La, L ac and C ac After discharge and reverse charging; when S2 and S3 are on, it is the negative half cycle of phase A and single phase, La, L ac and C ac After discharge, it is reversely charged. Phase B is similar to phase A and will not be described in detail.

[0052] Since the C bridge arm is connected to the low voltage DC port V dc2 , so it is different from phase A and phase B. At each moment, two switch tubes are turned on, namely S7 and S8, S7 and S9, S8 and S9. When S7 and S8 are turned on, phase C is in the positive half period, and the low voltage DC V dc2 In buck charging state, V dc1 (750V) to La, L dc2 and C dc2 Charge.

[0053] In this embodiment, the multi-port energy router further includes a first control module and a second control module; wherein the first control module controls; controls the MOSFET power tube S 1、 The on and off of S2, S3, S4, S5, S6 and S7; the second control module controls the on and off of the MOSFET power tube S8 and the MOSFET power tube S9.

[0054] The first control module controls the MOSFET power tube S 1、 The method of turning on and off S2, S3, S4, S5, S6 and S7 is:

[0055] See also Figure 3-Figure 4 Taking the rectification mode as an example, the first control is: by sampling the output DC voltage V dc1 With DC voltage reference value V dc1 * Make a difference to get the first difference ΔV dc1 , ΔV dc1 After passing through the first PI proportional-integral controller PI1, it is subtracted from the d-axis component of the three-phase input current dq decoupling, and after passing through the PI proportional-integral controller PI2 of the current loop, a modulation index of 0.83 is added to obtain Ud. The negative iq component enters the PI proportional-integral controller of the current loop, and then is inverted to obtain Uq. Ud and Uq are converted into three-phase abc coordinates, and the DC bias is added / subtracted and compared with the carrier to obtain the control pulses of MOSFET power tubes S1, S3, S4, S6 and S7. The control pulses of S1 and S3 are inverted and added to obtain the control pulse of S2. Similarly, the control pulse of S5 can be obtained;

[0056] See also Figure 5 , the second control module includes a DC voltage step-down unit, a voltage outer loop DQ decoupling control unit, a current inner loop control unit and SPWM connected in sequence;

[0057] The input end of the DC voltage frequency reduction unit is used as the input end of the second control module. The second control module is configured by using V dc2 With DC voltage reference value V dc2*After the difference is made, it enters the PI proportional integral controller to obtain the duty cycle of the low-voltage DC buck, and then compares it with the carrier to obtain the control pulse of S9, and performs the above operation to obtain the control pulse of S8. The control pulses of MOSFET power tube S8 and MOSFET power tube S9 are obtained respectively.

[0058] The input end of the DC voltage step-down unit receives the output DC voltage V dc1 With DC voltage reference value V dc1 *ΔV obtained by subtraction dc1 The input end of the DC voltage frequency reduction unit receives the output DC voltage V dc2 With DC voltage reference value V dc2 *ΔV obtained by subtraction dc2 , the ΔV dc1 and ΔV dc2 After passing through the PI loop, the control pulse is compared with the carrier.

[0059] In order to verify the nine-switch four-port power router of this embodiment, a simulation test is performed.

[0060] See also Figure 8 In the simulation test, the three-phase AC power input is 220V, the AC frequency is 50Hz, the switching frequency is 50kHz, the output high voltage DC is 750V, the input inductance L is 1mH, and the filter inductance C is 1mH. f The DC side support capacitor C is 20μF. dc1 and C dc2 The single-phase output capacitor C is 470μF and 70μF. ac 10μF, resistive load R ac , R dc1 , R dc2 48 ohms, 300 ohms and 12 ohms, such as Figure 6 When the three-phase voltage is 220V, the output voltage is 750V DC, 220V AC and 48V low voltage DC. Figure 6 (b) Figure 6 Detail of the output waveform in (a), and Figure 7 is the input three-phase current waveform; Figure 8 As shown, when the input is 750V DC, the output is three-phase AC 220V, output single-phase 220V and DC output 48V, where Figure 8 (b) Figure 8 (a) Detailed diagram of the output waveform. The function of converting three-phase AC into DC and single-phase AC is realized, and the function of converting DC into three-phase AC, unidirectional AC and DC is also realized.

[0061] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A nine-switch four-port power router, characterized in that: The four output ports are three-phase voltage port, single-phase voltage port, high-voltage DC port and low-voltage DC port, and the nine power switch tubes are S1~S9, among which S1, S2 and S3 correspond to the A-phase bridge arm, S4, S5 and S6 correspond to the B-phase bridge arm, and S7, S8 and S9 correspond to the C-phase bridge arm; The high voltage DC port is V dc1 , port by C dc1 With R dc1 The load is connected in parallel or connected to a DC source with a 750V input. When it is a load, its rated voltage is 750V; The low voltage DC port is V dc2 , port by C dc2 , L dc2 and R dc2 The load consists of dc2 , R dc2 In parallel with L dc2 Connected in series; its rated voltage is 48V; The single-phase AC port is V ac , port by C ac , L ac and R ac The load consists of ac , R ac In parallel with L ac ; Its rated voltage is 220V; When the three-phase port is connected to a three-phase power supply, V a 、V b and V c The three-phase input terminal is connected to the three-phase inductor L a , L b and L c When three boost inductors are connected to a three-phase load, the load on phase A is L a , C a and R a Composition, and C a , R a In parallel with L a Series connection; B phase load is connected by L b , C b and R b Composition, and C b , R b In parallel with L b Series connection; C phase load is connected by L c , C c and R c Composition, and C c , R c In parallel with L c Series connection; the rated output of each phase is 220V AC, which can be used for three-phase motors; The energy flow direction of the rectification mode can be three-phase AC V a 、V b and V c To the single-phase output port V ac and high voltage DC and low voltage DC ports V dc1 and V dc2 , when the inverter mode energy flow direction can be high voltage DC port V dc1 To the single-phase output port V ac And three-phase AC V a 、V b 、V c and low voltage DC port V dc2 , used to realize the function of a multi-port energy router.

2. A nine-switch four-port power router according to claim 1, characterized in that: The multi-port energy router includes 2 working modes; Among them, working mode 1 is rectification mode, V dc1 The high-voltage DC port is used as input and connected to a DC 750V. The S1 switch tube source level of the A-phase bridge arm outputs the A-phase voltage and the single-phase voltage by modulating the multiplexed switch tube. The S4 switch tube source level of the B-phase bridge arm outputs the B-phase voltage and the single-phase voltage by modulating the multiplexed switch tube. The S7 switch tube source level of the C-phase bridge arm outputs the C-phase voltage and the low-voltage DC voltage by modulating the multiplexed switch tube. Taking the A-phase bridge arm as an example, there are two switch tubes turned on at each moment, namely S1 and S2, S1 and S3, S2 and S3 are turned on; when S1 and S2 are turned on, it is the positive half cycle of phase A and single phase, V dc1 To La, L ac and C ac Charging; when S1 and S3 are connected, it is the positive half cycle of phase A and the negative half cycle of single phase, V dc1 Charge La, L ac and C ac After discharge and reverse charging; when S2 and S3 are on, it is the negative half cycle of phase A and single phase, La, L ac and C ac After discharge and reverse charging; C bridge arm is connected to low voltage DC port V dc2 At any time, two switch tubes are turned on, namely S7 and S8, S7 and S9, S8 and S9; when S7 and S8 are turned on, phase C is in the positive half period, and the low voltage DC V dc2 In buck charging state, V dc1 To La, L dc2 and C dc2 Charge; Working mode 2 is the inverter mode, which uses the three-phase ports of Va, Vb and Vc as input, and rectifies the three-phase voltage into a high-voltage DC V through modulation multiplexing. dc1 , and convert 750V DC into single-phase 220V through modulation, and step down 750V into 48V DC output; Taking phase A as an example, at any time, two switching tubes are turned on, namely S1 and S2, S1 and S3, S2 and S3 are turned on; when S1 and S2 are turned on, it is the positive half cycle of phase A and single phase, and phase A is turned to single phase L ac and C ac and high voltage DC V dc1 With C dc1 Charging; when S1 and S3 are turned on, phase A is in the positive half cycle and the single-phase negative half cycle, and phase A is charged to the high voltage DC V dc1 With C dc1 Charging, L ac and C ac Discharge; when S2 and S3 are connected, it is the negative half cycle of phase A and single phase, and the high voltage DC port C dc1 To R dc1 Discharge, single-phase AC port L ac and C ac Discharge; Taking phase C as an example, at any time, two switching tubes are turned on, namely S7 and S8, S7 and S9, S8 and S9. When S7 and S8 are turned on, it is the positive half cycle of phase C and single phase, and the voltage of phase C is positive to the high voltage DC C. dc1 With R dc1 Charging, the high-voltage DC port is rectified to 750V, and the high-voltage DC is sent to L dc1 , C dc1 and R dc1 Charging; when S7 and S9 are turned on, phase C is in the positive half cycle, and the voltage of phase C is dc1 With R dc1 Charging, low voltage port L dc2 To C dc2 When S8 and S9 are turned on, phase C is in the negative half cycle, and the high voltage DC port C dc1 To R dc1 Discharge, low voltage DC port L dc2 To C dc2 Follow-on discharge.

3. A nine-switch four-port power router according to claim 2, characterized in that: The multi-port energy router further includes a first control module and a second control module; Among them, the first control module: controls the MOSFET power tube S 1、 Turning on and off of S2, S3, S4, S5, S6 and S7; The second control module: controls the on and off of the MOSFET power tube S8 and the MOSFET power tube S9.

4. A nine-switch four-port power router according to claim 3, characterized in that: The first control module controls the MOSFET power tube S 1、 Turning on and off of S2, S3, S4, S5, S6 and S7.

5. The nine-switch four-port power router according to claim 3, characterized in that: The second control module includes a DC voltage frequency reduction unit, a voltage outer loop dq decoupling control unit, a current inner loop control unit and SPWM which are connected in sequence.

6. A nine-switch four-port power router according to claim 5, characterized in that: The input end of the DC voltage frequency reduction unit is used as the input end of the second control module. The second control module is connected to the DC voltage frequency reduction unit through V dc2 With DC voltage reference value V dc2 *After making the difference, it enters the PI proportional integral controller.

7. A nine-switch four-port power router according to claim 6, characterized in that: The input end of the DC voltage frequency reduction unit receives the output DC voltage V dc1 With DC voltage reference value V dc1 *ΔV obtained by subtraction dc1 The input end of the DC voltage frequency reduction unit receives the output DC voltage V dc2 With DC voltage reference value V dc2 *ΔV obtained by subtraction dc2 , the ΔV dc1 and ΔV dc2 After passing through the PI loop, the control pulse is compared with the carrier.

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