A power router and a power router control method

Abstract

The present invention discloses an electric energy router and an electric energy router control method, including: three phase units; each phase unit includes two bridge arm units connected in series, and the connection point of the two bridge arm units in series forms a high-voltage AC port of the corresponding phase unit; each high-voltage AC port is respectively connected to the AC power supply of the corresponding phase; the three phase units are connected in parallel to form a high-voltage DC port; each bridge arm unit is composed of a bridge arm reactor, a power module unit and a plurality of hybrid AC submodules connected in series; each phase unit is connected to a different number of hybrid AC submodules to form AC ports of different voltage levels of the corresponding phase unit. The present invention realizes the control of power transmission between each electrical connection port, bridge arm energy balance and submodule capacitor voltage sharing control, and can provide high-voltage, medium-voltage and low-voltage AC and DC electrical ports in an integrated manner, effectively improving the power density and energy efficiency of the equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of multi-port AC-DC power conversion and energy transfer, and in particular to a power router and a power router control method. Background Art

[0002] The power router has technical advantages such as independent regulation of active and reactive power and flexible control. It can realize multi-voltage AC and DC power transformation and multi-system energy interconnection, directly provide grid connection and power supply ports for renewable energy and AC and DC loads, and is an important means to improve the acceptance capacity of renewable energy, enhance the stability and flexibility of the power grid, and support energy transformation. The existing power router needs to rectify the electric energy first, then DC transform it, and finally invert it, which is a three-level transformation. Due to the large number of electric energy transformation levels, the equipment operation efficiency is low, and it directly leads to a large number of sub-modules and power devices required for the equipment, resulting in high equipment cost and large size. Summary of the invention

[0003] Therefore, the present invention provides a power router and a power router control method, so as to solve the problem that the existing power router has many power conversion stages and cannot ensure the operation efficiency of the equipment.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] In a first aspect, an embodiment of the present invention provides an electric energy router, comprising: three phase units; each phase unit comprises two bridge arm units connected in series, and the connection point of the two bridge arm units connected in series forms a high-voltage AC port of the corresponding phase unit; each high-voltage AC port is respectively connected to the AC power supply of the corresponding phase; the three phase units are connected in parallel to form a high-voltage DC port; each bridge arm unit is composed of a bridge arm inductor, a power module unit and a plurality of hybrid AC sub-modules connected in series; different numbers of hybrid AC sub-modules are connected in each phase unit to form AC ports of different voltage levels of the corresponding phase unit.

[0006] In one embodiment, the power module unit includes a plurality of power sub-modules connected in series; the power sub-modules include half-bridge sub-modules or full-bridge sub-modules.

[0007] In one embodiment, each bridge arm unit is further connected in series with a plurality of hybrid DC sub-modules; DC ports of different voltage levels are formed by connecting different numbers of hybrid DC sub-modules.

[0008] In one embodiment, the power router further includes a controller, which is connected to each DC port, AC port, each power sub-module, hybrid DC sub-module and hybrid AC sub-module, and is used to control the working state of each sub-module to achieve conversion of output voltages of multiple DC ports with different voltage levels or multiple AC ports with different voltage levels.

[0009] In one embodiment, the DC output ends of the multiple hybrid DC sub-modules are connected in any one of series, parallel, or series-parallel mixed connection; the AC output ends of the multiple hybrid AC sub-modules in the phase unit are connected in any one of series, parallel, or series-parallel mixed connection.

[0010] In one embodiment, the half-bridge sub-module includes a DC capacitor, two IGBT devices, a resistor and a thyristor, wherein the two IGBT devices are connected in series to form an IGBT device series branch; the IGBT device series branch, the resistor and the DC capacitor are connected in parallel; the thyristor is connected in parallel to any one of the two IGBT devices, the anode of the thyristor is connected to the negative electrode of the DC capacitor, the cathode is connected in parallel to the collector of the parallel-connected IGBT devices, the cathode of the thyristor leads to the positive output of the half-bridge sub-module, and the anode leads to the negative output of the half-bridge sub-module.

[0011] In one embodiment, the full-bridge sub-module includes a DC capacitor, four IGBT devices, and a resistor, wherein the four IGBT devices are connected in series in pairs to form two IGBT device series branches; the two IGBT device series branches, the resistor, and the DC capacitor are connected in parallel, and the series connection points in the two IGBT device series branches serve as the positive output and negative output of the full-bridge sub-module respectively.

[0012] In one embodiment, the hybrid DC sub-module includes: a first front-stage circuit and a rear-stage isolated DC / DC converter circuit, wherein the first front-stage circuit is any one of the half-bridge sub-module or the full-bridge sub-module, the first front-stage circuit includes a DC capacitor, and the positive and negative electrodes of the DC capacitor of the first front-stage circuit are connected to the first end of the rear-stage isolated DC / DC converter; the rear-stage isolated DC / DC converter is any one of an isolated dual active bridge DAB converter or an isolated resonant converter, and the second end of the rear-stage isolated DC / DC converter serves as the DC output end of the hybrid DC sub-module.

[0013] In one embodiment, the hybrid AC submodule includes a second front-stage circuit and a rear-stage inverter conversion circuit, wherein the second front-stage circuit includes a DC capacitor, and the positive and negative electrodes of the DC capacitor in the second front-stage circuit are connected to the DC end of the rear-stage inverter circuit; the second front-stage circuit is any one of a half-bridge submodule or a full-bridge submodule, and the rear-stage inverter circuit is any one of a single-stage inverter circuit or a two-stage inverter circuit; the single-stage inverter circuit includes a full-bridge inverter circuit and a single-phase isolation transformer, the first end winding of the single-phase isolation transformer is connected to the AC end of the full-bridge inverter circuit, and the second end winding serves as the AC output end of the hybrid AC submodule; the two-stage inverter circuit includes any one of an isolated dual active bridge DAB converter or an isolated resonant converter, and a full-bridge topology circuit, the DC end of the full-bridge inverter circuit is connected to the output end of any one of the isolated dual active bridge DAB converter or the isolated resonant converter, and the AC end of the full-bridge inverter circuit serves as the AC output end of the hybrid AC submodule.

[0014] In a second aspect, an embodiment of the present invention provides a control method for a power router, comprising: acquiring target power data; and controlling the working state of each submodule of the power router described in the first aspect according to the target power data to achieve output voltage conversion of multiple DC ports with different voltage levels or multiple AC ports with different voltage levels.

[0015] The technical solution of the present invention has the following advantages:

[0016] The electric energy router provided by the present invention can realize the control of power transmission between each electrical connection port, bridge arm energy balance and submodule capacitor voltage control through AC and DC ports of different voltage levels, and can provide high-voltage, medium-voltage and low-voltage AC and DC electrical ports in an integrated manner. The bridge arm submodule capacitor is used as a unified energy storage link for energy exchange of each electrical port, which greatly reduces the number of transformation levels between each electrical port, effectively reduces the number of capacitors required by the system, and can significantly improve the power density and energy efficiency of the equipment; it can effectively reduce the volume and cost of the system. By adopting a modular design and improving the redundancy of the submodules, the reliability of equipment operation can be ensured, the two-way flow of energy between each electrical connection port can be realized, and the fault current suppression function of each port can be provided, which is suitable for high-voltage and large-capacity and medium- and low-voltage and small-capacity applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of a power router provided by an embodiment of the present invention;

[0019] Figure 2 A structural diagram of a bridge arm unit of a power router provided by an embodiment of the present invention;

[0020] Figure 3 A composition diagram of a specific example of another bridge arm unit of the power router provided by an embodiment of the present invention;

[0021] Figure 4 Another specific topological structure of the bridge arm unit of the power router provided by the embodiment of the present invention;

[0022] Figure 5 The topological structure of the hybrid DC submodule provided in the embodiment of the present invention;

[0023] Figure 6 Another topological structure of the hybrid DC submodule provided in an embodiment of the present invention;

[0024] Figure 7 The topological structure of the hybrid AC submodule provided in the embodiment of the present invention;

[0025] Figure 8 Another topological structure of the hybrid AC submodule provided by an embodiment of the present invention;

[0026] Fig. 9 The specific topology structure of the power router provided by the embodiment of the present invention;

[0027] Fig.10 Another topological structure of the power router provided by the embodiment of the present invention;

[0028] Fig.11 Another specific topology structure of the power router provided by the embodiment of the present invention. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] Example

[0034] The embodiment of the present invention provides an electric energy router, which is applicable to various energy conversion applications, and is applied to the interconnection of multi-voltage level AC and DC systems and energy transmission, such as Figure 1 As shown, the power router in the embodiment of the present invention includes: three phase units are three-phase sequences of AC power (A phase unit 01, B phase unit 02, C phase unit 03), each phase unit includes two bridge arm units connected in series, and the connection point of the two bridge arm units (upper bridge arm unit 1 and lower bridge arm unit 2) connected in series forms a high-voltage AC port of the corresponding phase unit; each high-voltage AC port is connected to the AC power supply (A, B, C phase) of the corresponding phase respectively; the three phase units are connected in parallel to form a high-voltage DC port; each bridge arm unit is composed of a bridge arm reactor 11, a power module unit 12 and a plurality of hybrid AC sub-modules 13 connected in series; each phase unit is connected to a different number of hybrid AC sub-modules 13 to form AC ports of different voltage levels of the corresponding phase unit.

[0035] Specifically, taking a bridge arm unit of a power router as an example, Figure 2In the embodiment of the present invention, the bridge arm unit structure of the power router is composed of a bridge arm inductor 11, N power module units 12 (conventional submodules), and K hybrid AC submodules 13 connected in series, wherein the AC output ends of the K hybrid AC submodules 13 are all led out, and the AC output ends of multiple hybrid AC submodules 13 in the bridge arm unit are connected in series, in parallel, or in series-parallel hybrid to form a one-phase medium-low voltage AC voltage port.

[0036] The constant current energy transmission device power router provided by the embodiment of the present invention realizes the control of power transmission between each electrical connection port through AC and DC ports of different voltage levels, bridge arm energy balance and submodule capacitor voltage control, and can provide high-voltage, medium-voltage and low-voltage AC and DC electrical ports in an integrated manner. The bridge arm submodule capacitor is used as a unified energy storage link for energy exchange of each electrical port, which greatly reduces the number of transformation levels between each electrical port, effectively reduces the number of capacitors required by the system, and can significantly improve the power density and energy efficiency of the equipment; it can effectively reduce the volume and cost of the system. By adopting a modular design and improving the redundancy of the submodules, the reliability of equipment operation can be ensured, the two-way flow of energy between each electrical connection port can be realized, and the fault current suppression function of each port can be provided, which is suitable for high-voltage and large-capacity and medium- and low-voltage and small-capacity applications.

[0037] In a specific embodiment, the power module unit includes a plurality of power submodules connected in series; wherein the power submodule includes a half-bridge submodule or a full-bridge submodule; each bridge arm unit is also connected in series with a plurality of hybrid DC submodules; and DC ports of different voltage levels are formed by connecting different numbers of hybrid DC submodules. In practical applications, each bridge arm unit is formed by a bridge arm reactor and a plurality of power module units in series, wherein the power module unit is composed of a plurality of IGBT elements and corresponding auxiliary circuits connected in series or in parallel, and the submodule is a basic unit for realizing AC / DC conversion of the power router.

[0038] The types of power module units in series in each bridge arm unit include: half-bridge sub-module, full-bridge sub-module, hybrid DC sub-module and hybrid AC sub-module. Each bridge arm unit can be composed of one or several types of sub-modules in series. Figure 3 The figure shows a schematic diagram of a bridge arm unit of an electric energy router in an embodiment of the present invention. The bridge arm unit is composed of a bridge arm inductor 11 and N power module units 12 in series, wherein the power sub-module can use a classic full-bridge sub-module or a classic half-bridge sub-module or a mixture of the two. It should be noted that the above-mentioned bridge arm unit does not have a medium or low voltage AC or DC voltage output port.

[0039] The half-bridge submodule includes a DC capacitor, two IGBT devices, a resistor and a thyristor, wherein the two IGBT devices are connected in series to form an IGBT device series branch; the IGBT device series branch, the resistor and the DC capacitor are connected in parallel; the thyristor is connected in parallel with any one of the two IGBT devices, the anode of the thyristor is connected to the negative electrode of the DC capacitor, the cathode is connected in parallel with the collector of the parallel-connected IGBT device, the cathode of the thyristor leads to the positive output of the half-bridge submodule, and the anode leads to the negative output of the half-bridge submodule. Figure 3 The half-bridge submodule (HBSM) topology shown is composed of a DC capacitor 204, two IGBT devices T1 and T2 and matching thyristors, equalizing resistors 202, 203, a bypass switch 206, a thyristor 207, and a central logic control unit 205; wherein, two IGBT devices are connected in series to form an IGBT device series branch 22, the IGBT device series branch 22, the equalizing resistor and the DC capacitor 204 are connected in parallel, the thyristor 207 is connected in parallel with an IGBT device T2, its anode is connected to the negative electrode of the DC capacitor 204, and its cathode is connected to the collector of the parallel IGBT device T2, the cathode of the thyristor 207 leads to the positive output of the half-bridge submodule, and the anode of the thyristor 207 leads to the negative output of the half-bridge submodule.

[0040] The full-bridge submodule includes a DC capacitor, four IGBT devices, and a resistor, wherein the four IGBT devices are connected in series in pairs to form two IGBT device series branches; the two IGBT device series branches, the resistor, and the DC capacitor are connected in parallel, and the series connection points in the two IGBT device series branches serve as the positive output and negative output of the full-bridge submodule respectively. Figure 3 The full-bridge submodule (FBSM) topology shown is composed of a DC capacitor 211, four IGBT devices T3, T4, T5 and T6 and matching thyristors, equalizing resistors 209, 210, a bypass switch 208, and a central logic control unit 212; wherein the four IGBT devices are connected in series in pairs to form two IGBT device series branches 23 and 24, the two IGBT device series branches 23, 24, the equalizing resistors 209, 210 and the DC capacitor 211 are connected in parallel, and the series connection points in the two IGBT device series branches serve as the positive output and negative output of the full-bridge submodule respectively.

[0041] This embodiment provides another topological structure of the bridge arm unit of the power router, such as Figure 4The bridge arm unit shown is composed of a bridge arm inductor 11, N power module units 12, J hybrid DC sub-modules 14, and K hybrid AC sub-modules 13 connected in series, wherein the output ends of the hybrid sub-modules are all led out, and the DC output ends of multiple hybrid DC sub-modules 14 in the bridge arm unit are connected in series, in parallel, or in series and parallel to form a medium and low voltage DC voltage port, and the AC output ends of multiple hybrid AC sub-modules 13 are connected in series, in parallel, or in series and parallel to form a one-phase medium and low voltage AC voltage port.

[0042] Among them, the hybrid DC sub-module includes: a first front-stage circuit and a rear-stage isolated DC / DC converter circuit, the first front-stage circuit is any one of a half-bridge sub-module or a full-bridge sub-module, the first front-stage circuit includes a DC capacitor, and the positive and negative electrodes of the DC capacitor of the first front-stage circuit are connected to the first end of the rear-stage isolated DC / DC converter; the rear-stage isolated DC / DC converter is any one of an isolated dual active bridge DAB converter or an isolated resonant converter, and the second end of the rear-stage isolated DC / DC converter serves as the DC output end of the hybrid DC sub-module.

[0043] like Figure 5 A topological schematic diagram of a hybrid DC submodule is shown, and the hybrid DC submodule includes a first front-stage circuit 301 and a rear-stage isolated DC / DC converter circuit 302. The first front-stage circuit 301 adopts a half-bridge submodule circuit, and the positive and negative electrodes of the DC capacitor in the first front-stage circuit 301 are connected to one end of the rear-stage isolated DC / DC converter circuit 302. The rear-stage isolated DC / DC converter circuit 302 adopts an isolated dual active bridge DAB converter, and the other end of the rear-stage isolated DC / DC converter circuit 302 serves as the DC output end of the hybrid DC submodule. Among them, the first front-stage circuit 301 can be a half-bridge submodule or a full-bridge submodule circuit, and the rear-stage isolated DC / DC converter circuit 302 can be an isolated dual active bridge DAB converter, or an isolated resonant converter.

[0044] Specifically, this embodiment also provides another topological schematic diagram of a hybrid DC submodule, such as Figure 6 As shown, the hybrid DC submodule adopts the front-stage half-bridge submodule circuit 401, and the rear stage adopts the isolated resonant converter 402. It should be noted that the topological structure of the hybrid DC submodule can be set according to actual needs, and an existing circuit structure can be selected, and this embodiment is not limited to this.

[0045] The hybrid AC sub-module includes a second front-stage circuit and an inverter conversion circuit, wherein the second front-stage circuit is any one of a half-bridge sub-module or a full-bridge sub-module, and the inverter conversion circuit includes a full-bridge topology circuit and a single-phase isolation transformer; the second front-stage circuit includes a DC capacitor, and the positive and negative electrodes of the DC capacitor in the second front-stage circuit are connected to the DC end of the inverter conversion circuit; the first end winding of the single-phase isolation transformer is connected to the AC end of the full-bridge topology circuit, and the second end winding serves as the AC output end of the hybrid AC sub-module.

[0046] This embodiment provides a topology diagram of a hybrid AC submodule, such as Figure 7 As shown, the hybrid AC submodule includes a second front-stage circuit 501 and a rear-stage full-bridge conversion circuit 502, the second front-stage circuit 501 adopts a half-bridge submodule circuit, the positive and negative electrodes of the DC capacitor in the second front-stage circuit 501 are connected to the DC end of the rear-stage full-bridge conversion circuit 502, and the rear-stage full-bridge conversion circuit 502 includes a full-bridge topology circuit and a single-phase isolation transformer, one end winding of the single-phase isolation transformer is connected to the AC end of the full-bridge topology, and the other end winding serves as the AC output end of the hybrid AC submodule. Among them, the second front-stage circuit 501 can be a half-bridge submodule or a full-bridge submodule circuit. It should be noted that this embodiment is only described by taking a topological structure of the above-mentioned hybrid AC submodule as an example, and other topological structures can be selected in practical applications, and this embodiment is not limited to this.

[0047] This embodiment provides another topology diagram of a hybrid AC submodule, such as Figure 8 As shown, the hybrid AC submodule includes a front-stage circuit 701 and a rear-stage inverter conversion circuit 702, the front-stage circuit 701 is any one of a half-bridge submodule or a full-bridge submodule, the positive and negative electrodes of the DC capacitor in the front-stage circuit 701 are connected to the DC end of the inverter conversion circuit 702, and the inverter conversion circuit 702 is any one of a single-stage inverter circuit or a two-stage inverter circuit. The single-stage inverter circuit includes a full-bridge inverter circuit and a single-phase isolation transformer.

[0048] The first end winding of the single-phase isolation transformer is connected to the AC end of the full-bridge inverter circuit, and the second end winding serves as the AC output end of the hybrid AC sub-module; the two-stage inverter circuit includes any one of an isolated dual active bridge DAB converter or an isolated resonant converter, and a full-bridge topology circuit, wherein the DC end of the full-bridge inverter circuit is connected to the output end of any one of the isolated dual active bridge DAB converter or the isolated resonant converter, and the AC end of the full-bridge inverter circuit serves as the AC output end of the hybrid AC sub-module.

[0049] The power router provided in the embodiment of the present invention further includes a controller, wherein the controller is connected to each DC port, AC port, each power sub-module, hybrid DC sub-module and hybrid AC sub-module, and is used to control the working state of each sub-module (including each power sub-module, hybrid DC sub-module and hybrid AC sub-module) to achieve the conversion of output voltages of multiple DC ports with different voltage levels or multiple AC ports with different voltage levels, wherein the controller is an existing controller, and the present invention does not impose any restrictions on the selection of the controller itself.

[0050] By setting the controller to collect the voltage and current of each port of the power router and the voltage of each DC capacitor, and outputting the trigger signal of the internal power devices of all submodules according to the collected data, it is used for AC power control, AC output voltage control, DC power control, DC output voltage control, energy balance control inside the power router and submodule capacitor voltage control. Then, the energy balance control between phases and the energy balance control between the upper and lower bridge arms are realized; the energy balance control between phases adjusts the DC component of the upper and lower bridge arms output and then adjusts the DC component of the internal circulation of the power router, thereby achieving phase energy balance; the energy balance control between the upper and lower bridge arms adjusts the AC component of the internal circulation of the energy router by adjusting the high-frequency AC component of the upper and lower bridge arms output and then adjusts the AC component of the internal circulation of the energy router, thereby achieving energy balance between the bridge arms.

[0051] Specifically, a specific topological structure is used as an example. Fig. 9 As shown in the figure, the power router topology adopts the MMC skeleton, and the DC side port of the MMC structure is the high-voltage DC port U of the power router. dcN (112, 113), the AC side port of the MMC structure is the high voltage AC port (114, 115, 116) of the power router; in this embodiment, the bridge arm unit of the power router is connected in series with the DC output end of the hybrid DC submodule in series, in parallel, or in series and parallel to form a plurality of medium and low voltage DC voltage ports, such as Fig. 9 As shown in the middle ports 117, 118, 119, 120, 121, 122, 123, 124, 125, 126 and 127, 128; the AC output terminals of the hybrid AC submodules of the bridge arm units of the power router are connected in series, in parallel, or in series-parallel hybrid to form a single-phase medium-low voltage AC voltage port, such as Fig. 9 As shown in the middle ports 129, 130, 131, 132 and 133, 134, 135, 136.

[0052] It should be noted that, in this embodiment, the topology structure of the power router is described by taking an MMC structure as an example. In practical applications, it can be selected and set according to actual needs, and this embodiment is not limited to this.

[0053] In this embodiment, when the DC output ends of multiple hybrid DC sub-modules are connected in series and in series-parallel to form a medium and low voltage DC port of a multifunctional highly integrated compact power router, the number of medium and low voltage DC ports of the multifunctional highly integrated compact power router is multiple, and the two ends of the medium and low voltage DC port are the first end and the second end of a DC output port of a hybrid DC sub-module, or the two ends of the medium and low voltage DC port are the first end of the DC output port of the first hybrid DC sub-module and the second end of the DC output port of the last hybrid DC sub-module among at least two DC output ports of the hybrid DC sub-modules connected in series among the DC output ports of the multiple hybrid DC sub-modules; when the DC output ends of multiple hybrid DC sub-modules are connected in parallel to form a medium and low voltage DC port of a multifunctional highly integrated compact power router, the number of medium and low voltage DC ports of the multifunctional highly integrated compact power router is 1.

[0054] like Fig.10 As shown, another topological structure of an electric energy router is provided. In this embodiment, the upper bridge arm unit in the bridge arm unit of the electric energy router is composed of a bridge arm inductor, N conventional sub-modules, and K hybrid DC sub-modules. The lower bridge arm unit is composed of a bridge arm inductor, N conventional sub-modules, and K hybrid AC sub-modules. To ensure the capacitor voltage balance between the upper and lower bridge arm units, the total number of sub-modules of the upper and lower bridge arm units is the same; the phase unit is formed by connecting the upper bridge arm unit and the lower bridge arm unit in series. When the DC output ends of multiple hybrid DC sub-modules are connected in series and connected in series and parallel to form a low-voltage DC port in a multifunctional, highly integrated, compact electric energy router, the number of low-voltage DC ports in the multifunctional, highly integrated, compact electric energy router is multiple. As shown Fig.10 As shown, the first end 601 and the second end 602 of the DC output port of the No. 1 hybrid DC submodule HDCSM1 in the lower bridge arm unit A form a medium-low voltage DC port; the DC output port of the No. 1 hybrid DC submodule HDCSM1 and the DC output port of the No. 2 hybrid DC submodule HDCSM2 in the lower bridge arm unit B are connected in series, and the first end 603 of the DC output port of the No. 1 hybrid DC submodule HDCSM1 and the second end 604 of the DC output port of the No. 2 hybrid DC submodule HDCSMK also form a medium-low voltage DC port. In the lower bridge arm unit C, the DC output ports of the No. 1, No. 2 to No. K hybrid DC submodules HDCSM1 are connected in series, and the first end 605 of the DC output port of the No. 1 hybrid DC submodule HDCSM1 and the second end 606 of the DC output port of the No. K hybrid DC submodule HDCSMK also form a medium-low voltage DC port. The voltage level of the medium-low voltage DC port of the embodiment of the present invention in the figure is determined by the power device IGBT parameters, the submodule connection method, and the port lead-out method.

[0055] There are many ways to connect the AC output terminals of multiple hybrid AC submodules in series, in parallel, or in series-parallel hybrid to form a multifunctional, highly integrated, compact power router with medium and low voltage AC ports. Fig.10 As shown, the AC output ports of the No. 1, No. 2 to No. K hybrid AC submodules HACSM1 of each phase upper bridge arm unit of the power router are connected in series, and the first ends 607, 608, and 609 of the AC output port of the No. 1 hybrid AC submodule HACSM1 of each upper bridge arm unit are led out as three-phase AC output ports, respectively, and the second ends of the AC output ports of the No. K hybrid AC submodule HACSMK of each upper bridge arm unit are connected to form a neutral point 610, forming a medium and low voltage AC port in a star connection. The voltage level of the medium and low voltage AC port of the embodiment of the present invention in the figure is determined by the power device IGBT parameters, the submodule connection method, and the port lead-out method.

[0056] like Fig.11 As shown, another topological structure of the power router is provided. When the DC output terminals of multiple hybrid DC sub-modules are connected in parallel to form a low-voltage DC port in a multifunctional, highly integrated, compact power router, the number of low-voltage DC ports in the multifunctional, highly integrated, compact power router is 1. Fig.11 As shown, in this embodiment, all hybrid DC sub-modules of the lower bridge arm unit of the power router are connected in parallel, the first ends of the hybrid DC sub-modules are connected to form 611, the second ends are connected to form 612, and the terminals 611 and 612 form a medium and low voltage DC output port. By applying this connection method, the rated current of the medium and low voltage DC port can be effectively improved, and the port transmission capacity can be increased.

[0057] Among them, Fig.11 As shown, the AC output ports of the No. 1, No. 2 to No. K hybrid AC submodules HACSM1 of each phase upper bridge arm unit of the power router are connected in series, the first end 613 of the AC output port of the No. 1 hybrid AC submodule HACSM1 of the A phase upper bridge arm unit is connected to the second end 618 of the AC output port of the No. K hybrid AC submodule HACSMK of the C phase upper bridge arm unit, and the first end 615 of the AC output port of the No. 1 hybrid AC submodule HACSM1 of the B phase upper bridge arm unit is connected to the No. K hybrid AC submodule HACSMMK of the A phase upper bridge arm unit. The second end 614 of the HACSMK AC output port is connected, the first end 617 of the No. 1 hybrid AC sub-module HACSM1 AC output port of the C phase upper bridge arm unit is connected to the second end 616 of the No. K hybrid AC sub-module HACSMK AC output port of the B phase upper bridge arm unit, and the first ends 613, 615, and 617 of the No. 1 hybrid AC sub-module HACSM1 AC output port of the upper bridge arm unit of each phase are led out as three phases of the three-phase AC output port, forming a medium and low voltage AC port in a angular connection manner.

[0058] It should be noted that the medium and low voltage AC and DC ports of the power router provided by the present invention are brought out in various ways, including but not limited to the methods mentioned in the embodiments of the present invention. The methods in which the output end of the hybrid sub-module leads out the medium and low voltage AC and DC ports in any form of series, parallel or series-parallel mixed connection are all within the scope of protection of this patent.

[0059] An embodiment of the present invention also provides a control method for an electric energy router, comprising the following steps: acquiring target electric energy data, wherein the target electric energy data may include data such as power and voltage; then collecting the voltage and current of each port of the electric energy router and the voltage of each DC capacitor, outputting trigger signals of internal power devices of all sub-modules according to the target electric energy data and the collected data, and controlling the working state of each sub-module of the electric energy router to achieve conversion of output voltages of multiple DC ports with different voltage levels or multiple AC ports with different voltage levels.

[0060] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention.

Claims

1. A power router, characterized in that: include: Three phase units; Each phase unit comprises two bridge arm units connected in series, and a connection point of the two bridge arm units connected in series forms a high-voltage AC port of the corresponding phase unit; Each high-voltage AC port is respectively connected to an AC power source of a corresponding phase; The three phase units are connected in parallel to form a high voltage DC port; Each bridge arm unit is composed of a bridge arm reactor, a power module unit and a plurality of hybrid AC submodules connected in series; Different numbers of hybrid AC submodules are connected to each phase unit to form AC ports of different voltage levels of the corresponding phase unit; The power module unit comprises a plurality of power submodules connected in series; The power submodule includes a half-bridge submodule or a full-bridge submodule; Each bridge arm unit is also connected in series with a plurality of hybrid DC sub-modules; By connecting different numbers of hybrid DC sub-modules, DC ports of different voltage levels can be formed; The power router further includes a controller, The controller is connected to each DC port, AC port, each power submodule, hybrid DC submodule and hybrid AC submodule, and is used to control the working state of each submodule to achieve the conversion of the output voltages of multiple DC ports with different voltage levels or multiple AC ports with different voltage levels; The DC output terminals of the plurality of hybrid DC sub-modules are connected in any one of a series connection, a parallel connection, or a series-parallel hybrid connection; The AC output ends of the multiple hybrid AC sub-modules in the phase unit are connected in any one of series connection, parallel connection, and series-parallel hybrid connection.

2. The power router according to claim 1, characterized in that: The half-bridge submodule includes a DC capacitor, two IGBT devices, a resistor and a thyristor, wherein: Two IGBT devices are connected in series to form an IGBT device series branch; The IGBT device series branch, the resistor and the DC capacitor are connected in parallel; The thyristor is connected in parallel with any one of the two IGBT devices, the anode of the thyristor is connected to the negative electrode of the DC capacitor, the cathode is connected in parallel with the collector of the parallel-connected IGBT devices, the cathode of the thyristor leads to the positive output of the half-bridge sub-module, and the anode leads to the negative output of the half-bridge sub-module.

3. The power router according to claim 1, characterized in that: The full-bridge submodule includes a DC capacitor, four IGBT devices, and a resistor, wherein: Four IGBT devices are connected in series in pairs to form two IGBT device series branches; Two IGBT device series branches, a resistor and a DC capacitor are connected in parallel, and the series connection points in the two IGBT device series branches serve as the positive output and the negative output of the full-bridge submodule respectively.

4. The power router according to claim 1, characterized in that: The hybrid DC submodule includes: a first front-stage circuit and a rear-stage isolated DC / DC converter circuit, wherein: The first front-stage circuit is any one of the half-bridge sub-module or the full-bridge sub-module, the first front-stage circuit includes a DC capacitor, and the positive electrode and the negative electrode of the DC capacitor of the first front-stage circuit are connected to the first end of the rear-stage isolated DC / DC converter; The post-stage isolated DC / DC converter is any one of an isolated dual active bridge DAB converter or an isolated resonant converter, and the second end of the post-stage isolated DC / DC converter serves as the DC output end of the hybrid DC sub-module.

5. The power router according to claim 1, characterized in that: The hybrid AC submodule includes a second front-stage circuit and a rear-stage inverter circuit, wherein: The second front-stage circuit includes a DC capacitor, and the positive electrode and the negative electrode of the DC capacitor in the second front-stage circuit are connected to the DC end of the rear-stage inverter circuit; The second front-stage circuit is any one of a half-bridge submodule or a full-bridge submodule, and the rear-stage inverter circuit is any one of a single-stage inverter circuit or a two-stage inverter circuit; The single-stage inverter circuit includes a full-bridge inverter circuit and a single-phase isolation transformer, wherein a first end winding of the single-phase isolation transformer is connected to an AC end of the full-bridge inverter circuit, and a second end winding serves as an AC output end of the hybrid AC submodule; The two-stage inverter circuit includes any one of an isolated dual active bridge DAB converter or an isolated resonant converter, and a full-bridge topology circuit. The DC end of the full-bridge topology circuit is connected to the output end of any one of the isolated dual active bridge DAB converter or the isolated resonant converter, and the AC end of the full-bridge topology circuit serves as the AC output end of the hybrid AC sub-module.

6. A control method for an electric energy router, characterized in that: include: Obtain target power data; The working state of each submodule of the power router according to any one of claims 1 to 5 is controlled according to the target power data to achieve the conversion of the output voltages of multiple DC ports with different voltage levels or multiple AC ports with different voltage levels.

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