CN214315085U - Electric energy router - Google Patents

Abstract

The utility model discloses an electric energy router, include: 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 alternating current port of the corresponding phase unit; each high-voltage alternating current port is respectively connected with an alternating current power supply of a corresponding phase; the three phase units are connected in parallel to form a high-voltage direct-current port; each bridge arm unit is formed by connecting bridge arm reactors, power module units and a plurality of mixed alternating current submodules in series; and different numbers of mixed alternating current submodules are connected into each phase unit to form alternating current ports with different voltage levels of the corresponding phase unit. The utility model discloses realize the control of transmission power between each electrical connection port, bridge arm energy balance and submodule piece electric capacity voltage-sharing control can the integration provide high pressure, middling pressure and low pressure alternating current-direct current electrical port, lifting means power density and with the efficiency.

Description

Electric energy router

Technical Field

The utility model relates to a multiport is handed over-direct current power conversion and energy transfer technical field, concretely relates to electric energy router.

Background

The electric energy router has the technical advantages of active and reactive independent adjustment, flexible control and the like, can realize multi-voltage-level alternating current and direct current power transformation and multi-system energy interconnection, directly provides a grid-connected and power supply port for renewable energy sources and alternating current and direct current loads, and is an important means for improving the acceptance capacity of the renewable energy sources, enhancing the stability and flexibility of a power grid and supporting energy transformation. The existing electric energy router needs to rectify electric energy firstly, then transform the direct current and invert the electric energy finally, belongs to three-level transformation, and has low operation efficiency due to multiple transformation stages of the electric energy, and directly causes multiple submodules and power devices required by the equipment, so that the equipment has high cost and large volume.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model provides an electric energy router to it is many to solve current electric energy router electric energy transformation progression, can't guarantee equipment operating efficiency's problem.

In order to achieve the above purpose, the utility model provides a following technical scheme:

in a first aspect, an embodiment of the present invention provides an electric energy router, including: 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 alternating current port of the corresponding phase unit; each high-voltage alternating current port is respectively connected with an alternating current power supply of a corresponding phase; the three phase units are connected in parallel to form a high-voltage direct-current port; each bridge arm unit is formed by connecting bridge arm reactors, power module units and a plurality of mixed alternating current submodules in series; and different numbers of mixed alternating current submodules are connected into each phase unit to form alternating current ports with different voltage levels of the corresponding phase unit.

In an embodiment, the power module unit comprises a plurality of series-connected power sub-modules; the power sub-modules include half-bridge sub-modules or full-bridge sub-modules.

In one embodiment, each bridge arm unit is further connected with a plurality of hybrid direct current submodules in series; different voltage class direct current ports are formed by connecting different numbers of mixed direct current submodules.

In an embodiment, the electric energy router further includes a controller, and the controller is connected to each dc port, the ac port, each power sub-module, the hybrid dc sub-module, and the hybrid ac sub-module, and is configured to control a working state of each sub-module, so as to implement conversion of output voltages of the plurality of dc ports with different voltage classes or the plurality of ac ports with different voltage classes.

In one embodiment, the dc output terminals of the multiple hybrid dc submodules are connected in any one of series connection, parallel connection and series-parallel connection; the alternating current output ends of the mixed alternating current submodules in the phase units are connected in any one of series connection, parallel connection and series-parallel connection.

In one embodiment, the half-bridge sub-module comprises a direct current 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 direct current capacitor are connected in parallel; the thyristor is connected with any one of the two IGBT devices in parallel, the anode of the thyristor is connected with the negative electrode of the direct current capacitor, the cathode of the thyristor is connected with the collector electrode of the IGBT device in parallel, the cathode of the thyristor leads out the positive output of the half-bridge submodule, and the anode leads out the negative output of the half-bridge submodule.

In one embodiment, the full-bridge sub-module comprises a direct-current capacitor, four IGBT devices and a resistor, wherein the four IGBT devices are connected in series in pairs to form two series branches of the IGBT devices; the series connection points in the two IGBT device series branches are respectively used as the positive electrode output and the negative electrode output of the full-bridge sub-module.

In one embodiment, the hybrid dc sub-module includes: the first pre-stage circuit is any one of the half-bridge sub-module or the full-bridge sub-module, the first pre-stage circuit comprises a direct-current capacitor, and the anode and the cathode of the direct-current capacitor of the first pre-stage circuit are connected with the first end of the post-stage isolation type DC/DC converter; the rear-stage isolation type DC/DC converter is any one of an isolation type double-active-bridge DAB converter or an isolation type resonant converter, and the second end of the rear-stage isolation type DC/DC converter is used as the direct current output end of the mixed direct current sub-module.

In one embodiment, the hybrid alternating-current submodule comprises a second pre-stage circuit and a post-stage inverter circuit, wherein the second pre-stage circuit comprises a direct-current capacitor, and the positive electrode and the negative electrode of the direct-current capacitor in the second pre-stage circuit are connected with the direct-current end of the post-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 comprises a full-bridge inverter circuit and a single-phase isolation transformer, wherein a first end winding of the single-phase isolation transformer is connected with an alternating current end of the full-bridge inverter circuit, and a second end winding of the single-phase isolation transformer is used as an alternating current output end of the hybrid alternating current sub-module; the two-stage inverter circuit comprises an isolated double-active-bridge DAB converter or an isolated resonant converter, and a full-bridge topological circuit, wherein the direct current end of the full-bridge inverter circuit is connected with the output end of any one of the isolated double-active-bridge DAB converter or the isolated resonant converter, and the alternating current end of the full-bridge inverter circuit is used as the alternating current output end of the hybrid alternating current sub-module.

The utility model discloses technical scheme has following advantage:

the utility model provides an electric energy router, through the AC/DC port of different voltage classes, realize the control of transmission power between each electrical connection port, bridge arm energy balance and submodule piece electric capacity voltage-sharing control can provide high pressure, middling pressure and low pressure AC/DC electrical port integratedly, regard bridge arm submodule piece electric capacity as the unified energy storage link of each electrical port energy exchange, reduce the transform progression between each electrical port by a wide margin, effectively reduce the capacitor number that the system needs, can show the promotion equipment power density and use efficiency; the volume and the cost of the system can be effectively reduced. By adopting the modular design and improving the redundancy of the sub-modules, the operation reliability of the equipment can be ensured, the bidirectional flow of energy among the ports of the electrical connection is realized, and the fault current suppression function of each port is realized, so that the device is suitable for high-voltage large-capacity and medium-low voltage small-capacity application occasions.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic diagram of an electric energy router provided by an embodiment of the present invention;

fig. 2 is a structural diagram of a bridge arm unit of an electric energy router provided in an embodiment of the present invention;

fig. 3 is a composition diagram of a specific example of another bridge arm unit of the electric energy router provided in the embodiment of the present invention;

fig. 4 is another specific topology of a bridge arm unit of an electric energy router provided in the embodiment of the present invention;

fig. 5 is a topological structure of a hybrid dc sub-module according to an embodiment of the present invention;

fig. 6 is another topology of a hybrid dc sub-module according to an embodiment of the present invention;

fig. 7 is a topology of a hybrid communication sub-module according to an embodiment of the present invention;

fig. 8 is another topology of a hybrid communication sub-module according to an embodiment of the present invention;

fig. 9 is a specific topology of an electric energy router provided by an embodiment of the present invention;

fig. 10 is another topology of an electric energy router provided by an embodiment of the present invention;

fig. 11 is another specific topology of the electric energy router provided in the embodiment of the present invention.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Examples

An embodiment of the utility model provides an electric energy router is applicable to multiple energy conversion application, is applied to multivoltage level and hands over, direct current system interconnection and energy transfer, as shown in fig. 1, in the embodiment of the utility model provides an electric energy router includes: the three phase units are respectively alternating current three-phase sequences (an A phase unit 01, a B phase unit 02 and a C phase unit 03), each phase unit comprises two bridge arm units connected in series, and a connecting point of the two bridge arm units (an upper bridge arm unit 1 and a lower bridge arm unit 2) connected in series forms a high-voltage alternating current port of the corresponding phase unit; connecting each high-voltage alternating current port with an alternating current power supply (A, B, C phase) of a corresponding phase; the three phase units are connected in parallel to form a high-voltage direct-current port; each bridge arm unit is formed by connecting bridge arm reactors 11, power module units 12 and a plurality of mixed alternating current submodules 13 in series; different numbers of mixed alternating current submodules 13 are connected into each phase unit to form different voltage grade alternating current ports of the corresponding phase unit.

Specifically, take the bridge arm unit of an electric energy router as an example, as shown in fig. 2, the embodiment of the present invention provides an electric energy router bridge arm unit structure, which is formed by connecting a bridge arm reactor 11, N power module units 12 (conventional submodules), and K mixed ac submodules 13 in series, wherein the ac output ends of the K mixed ac submodules 13 are all led out, and the ac output ends of a plurality of mixed ac submodules 13 in the bridge arm unit are connected in series, in parallel, or in series-parallel to form a phase low-voltage ac voltage port.

The embodiment of the utility model provides a constant current energy feeding device electric energy router, through the AC/DC port of different voltage grades, realize the control of power transmission between each electrical connection port, balanced and the submodule piece electric capacity voltage-sharing control of bridge arm energy, can provide high pressure, middling pressure and low pressure AC/DC electric port integratedly, regard bridge arm submodule piece electric capacity as the unified energy storage link of each electric port energy exchange, reduce the conversion progression between each electric port by a wide margin, effectively reduce the capacitor number that the system needs, can show lifting means power density and energy consumption efficiency; the volume and the cost of the system can be effectively reduced. By adopting the modular design and improving the redundancy of the sub-modules, the operation reliability of the equipment can be ensured, the bidirectional flow of energy among the ports of the electrical connection is realized, and the fault current suppression function of each port is realized, so that the device is suitable for high-voltage large-capacity and medium-low voltage small-capacity application occasions.

In a specific embodiment, the power module unit comprises a plurality of power sub-modules connected in series; wherein the power sub-modules comprise half-bridge sub-modules or full-bridge sub-modules; each bridge arm unit is also connected with a plurality of mixed direct current submodules in series; different voltage class direct current ports are formed by connecting different numbers of mixed direct current submodules. In practical application, each bridge arm unit is formed by connecting a bridge arm reactor and a plurality of power module units in series, wherein each power module unit is formed by connecting a plurality of IGBT elements and corresponding auxiliary circuits in series or in parallel, and the sub-modules are basic units for realizing AC/DC conversion by the electric energy router.

The types of the series power module units in each bridge arm unit comprise: the bridge arm unit comprises a half-bridge submodule, a full-bridge submodule, a mixed direct current submodule and a mixed alternating current submodule, wherein each bridge arm unit can be formed by connecting one or more types of submodules in series. Fig. 3 is 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 formed by connecting a bridge arm reactor 11 and N power module units 12 in series, wherein the power sub-modules can use classic full-bridge sub-modules or classic half-bridge sub-modules or a mixture of the two, and it should be noted that the bridge arm unit does not have a medium-low voltage ac/dc voltage output port.

The half-bridge type submodule comprises a direct current 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 circuit; the IGBT device series branch, the resistor and the direct current capacitor are connected in parallel; the thyristor is connected with any one of the two IGBT devices in parallel, the anode of the thyristor is connected with the negative electrode of the direct current capacitor, the cathode of the thyristor is connected with the collector of the IGBT device connected in parallel, the cathode of the thyristor leads out the positive output of the half-bridge submodule, and the anode leads out the negative output of the half-bridge submodule. The half-bridge sub-module (HBSM) topology shown in fig. 3 is composed of a dc capacitor 204, two IGBT devices T1 and T2 and a complementary thyristor, a grading resistor 202, 203, a bypass switch 206, a thyristor 207, a central logic control unit 205; the IGBT device series branch 22 is formed by connecting two IGBT devices in series, the IGBT device series branch 22, the voltage-sharing resistor and the direct current capacitor 204 are connected in parallel, the thyristor 207 is connected in parallel with one IGBT device T2, the anode of the thyristor is connected with the negative electrode of the direct current capacitor 204, the cathode of the thyristor is connected with the collector electrode of the parallel IGBT device T2, the cathode of the thyristor 207 leads out the positive electrode output of the half-bridge submodule, and the anode of the thyristor 207 leads out the negative electrode output of the half-bridge submodule.

The full-bridge sub-module comprises a direct-current capacitor, four IGBT devices and a resistor, wherein the four IGBT devices are connected in series in pairs to form two series branches of the IGBT devices; the series connection points in the two IGBT device series branches are respectively used as the positive output and the negative output of the full-bridge sub-module. The full bridge sub-module (FBSM) topology as shown in fig. 3 is composed of a dc capacitor 211, four IGBT devices T3, T4, T5 and T6 and supporting thyristors, grading resistors 209, 210, a bypass switch 208, a central logic control unit 212; the four IGBT devices are connected in series in pairs to form two IGBT device series branches 23 and 24, the equalizing resistors 209 and 210 and the direct current capacitor 211 are connected in parallel, and series connection points in the two IGBT device series branches are respectively used as the positive output and the negative output of the full-bridge submodule.

In this embodiment, another topological structure of a bridge arm unit of an electric energy router is provided, where the bridge arm unit shown in fig. 4 is formed by connecting a bridge arm reactor 11, N power module units 12, J hybrid dc submodules 14, and K hybrid ac submodules 13 in series, where output ends of the hybrid submodules are all led out, dc output ends of a plurality of hybrid dc submodules 14 in the bridge arm unit are connected in series, in parallel, or in series-parallel series to form a medium-low voltage dc voltage port, and ac output ends of a plurality of hybrid ac submodules 13 are connected in series, in parallel, or in series-parallel to form a phase-low voltage ac voltage port.

Wherein, mix direct current submodule piece includes: the first pre-stage circuit comprises a direct current capacitor, and the anode and the cathode of the direct current capacitor of the first pre-stage circuit are connected with the first end of the post-stage isolation type DC/DC converter; the rear-stage isolation type DC/DC converter is any one of an isolation type double-active-bridge DAB converter or an isolation type resonant converter, and the second end of the rear-stage isolation type DC/DC converter is used as the direct current output end of the mixed direct current sub-module.

As shown in fig. 5, a topological schematic diagram of a hybrid DC sub-module is provided, where the hybrid DC sub-module includes a first pre-stage circuit 301 and a post-stage isolated DC/DC converter circuit 302, the first pre-stage circuit 301 adopts a half-bridge sub-module circuit, an anode and a cathode of a DC capacitor in the first pre-stage circuit 301 are connected to one end of the post-stage isolated DC/DC converter circuit 302, the post-stage isolated DC/DC converter circuit 302 adopts an isolated dual-active-bridge DAB converter, and the other end of the post-stage isolated DC/DC converter circuit 302 serves as a DC output end of the hybrid DC sub-module. The first front-stage circuit 301 may be a half-bridge sub-module or a full-bridge sub-module circuit, and the rear-stage isolated DC/DC converter circuit 302 may be an isolated dual-active-bridge DAB converter or an isolated resonant converter.

Specifically, this embodiment further provides another topology schematic diagram of the hybrid dc sub-module, as shown in fig. 6, the hybrid dc sub-module employs a front-stage half-bridge sub-module circuit 401, and the rear stage employs an isolated resonant converter 402. It should be noted that, the topology structure of the hybrid dc sub-module may be set according to actual requirements, and an existing circuit structure may be selected, which is not limited to this embodiment.

The hybrid alternating current submodule comprises a second preceding stage circuit and an inversion conversion circuit, wherein the second preceding stage circuit is any one of a half-bridge submodule or a full-bridge submodule, and the inversion conversion circuit comprises a full-bridge topological circuit and a single-phase isolation transformer; the positive electrode and the negative electrode of the direct current capacitor in the second pre-stage circuit are connected with the direct current end of the inversion conversion circuit; and a first end winding of the single-phase isolation transformer is connected with an alternating current end of the full-bridge topology circuit, and a second end winding of the single-phase isolation transformer is used as an alternating current output end of the mixed alternating current submodule.

The embodiment provides a topological schematic diagram of a hybrid alternating-current submodule, as shown in fig. 7, the hybrid alternating-current submodule includes a second preceding stage circuit 501 and a subsequent stage full-bridge conversion circuit 502, the second preceding stage circuit 501 adopts a half-bridge submodule circuit, the positive electrode and the negative electrode of a direct-current capacitor in the second preceding stage circuit 501 are connected with the direct-current end of the subsequent stage full-bridge conversion circuit 502, the subsequent stage full-bridge conversion circuit 502 includes a full-bridge topological circuit and a single-phase isolation transformer, one end winding of the single-phase isolation transformer is connected with the alternating-current end of the full-bridge topology, and the other end winding is used as the alternating-current output end of the hybrid alternating-current submodule. The second pre-stage circuit 501 may be a half-bridge sub-module or a full-bridge sub-module. It should be noted that, in the present embodiment, only one topology of the hybrid communication sub-module is taken as an example for description, and other topologies may be selected in practical application, which is not limited to this embodiment.

In this embodiment, another topological schematic diagram of a hybrid ac submodule is provided, as shown in fig. 8, 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 and a full-bridge submodule, a positive electrode and a negative electrode of a dc capacitor in the front-stage circuit 701 are connected to a dc terminal of the inverter conversion circuit 702, and the inverter conversion circuit 702 is any one of a single-stage inverter circuit and a two-stage inverter circuit. The single-stage inverter circuit comprises a full-bridge inverter circuit and a single-phase isolation transformer.

A first end winding of the single-phase isolation transformer is connected with an alternating current end of the full-bridge inverter circuit, and a second end winding of the single-phase isolation transformer is used as an alternating current output end of the hybrid alternating current sub-module; the two-stage inverter circuit comprises a full-bridge topological circuit and any one of an isolated double-active-bridge DAB converter or an isolated resonant converter, wherein the direct current end of the full-bridge inverter circuit is connected with the output end of any one of the isolated double-active-bridge DAB converter or the isolated resonant converter, and the alternating current end of the full-bridge inverter circuit is used as the alternating current output end of the hybrid alternating current sub-module.

The embodiment of the utility model provides an electric energy router still includes the controller, wherein the controller is connected with each direct current port, the interchange port, each power submodule piece, mixed direct current submodule piece and mixed interchange submodule piece for control each submodule piece (including each power submodule piece, mixed direct current submodule piece and mixed interchange submodule piece) operating condition, with the transform that realizes a plurality of different voltage level direct current ports or a plurality of different voltage level interchange port output voltage, wherein the controller is current controller, the utility model discloses do not carry out any restriction to the selection of controller itself.

The controller is set to collect voltage and current of each port of the electric energy router and voltage of each direct current capacitor, and outputs trigger signals of internal power devices of all sub-modules according to collected data, so that the controller is used for alternating current power control, alternating current output voltage control, direct current power control, direct current output voltage control, internal energy balance control of the electric energy router and sub-module capacitor voltage-sharing control. Further realizing interphase energy balance control and energy balance control between the upper bridge arm and the lower bridge arm; the inter-phase energy balance control adjusts the direct current component of the internal circulation of the electric energy router by adjusting the direct current component output by the upper bridge arm and the lower bridge arm, so as to achieve inter-phase energy balance; the energy balance control between the upper bridge arm and the lower bridge arm adjusts the high-frequency alternating current component output by the upper bridge arm and the lower bridge arm so as to adjust the alternating current component of the internal circulation of the energy router, and further achieve the energy balance between the bridge arms.

Specifically, a specific topology structure is taken as an example for explanation, as shown in fig. 9, the topology of the electric energy router adopts an MMC framework, and a dc side port of the MMC structure is a high-voltage dc side of the electric energy routerMouth U_dcN(112, 113), the alternating current side port of the MMC structure is a high-voltage alternating current port (114, 115, 116) of the electric energy router; in this embodiment, the dc output terminals of the bridge arm units of the electric energy router are connected in series to the hybrid dc sub-modules in series, in parallel, or in series-parallel to form a plurality of medium and low voltage dc voltage ports, as shown by ports 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128 in fig. 9; alternating current output ends of the electric energy router bridge arm unit series hybrid alternating current sub-modules are connected in series, in parallel or in series-parallel connection to form a phase low-voltage alternating current voltage port, as shown by ports 129, 130, 131, 132 and 133, 134, 135 and 136 in fig. 9.

It should be noted that, in the embodiment, the topology structure of the electric energy router is only an MMC structure as an example for description, and in practical application, the topology structure of the electric energy router may be selected and set according to practical requirements, which is not limited to this embodiment.

In this embodiment, when the dc output terminals of the multiple hybrid dc sub-modules are connected in series and in series-parallel to form the low-voltage dc port in the multifunctional high-integration compact electric energy router, the number of the low-voltage dc ports in the multifunctional high-integration compact electric energy router is multiple, two ends of the low-voltage dc port are the first end and the second end of one dc output port of the hybrid dc sub-modules, or two ends of the low-voltage dc port are the first end of the first dc output port and the second end of the last dc output port of the first dc sub-module among at least two dc output ports of the multiple hybrid dc sub-modules connected in series; under the condition that the direct current output ends of the plurality of mixed direct current submodules are connected in parallel to form the low-voltage direct current ports in the multifunctional high-integration compact electric energy router, the number of the low-voltage direct current ports in the multifunctional high-integration compact electric energy router is 1.

As shown in fig. 10, a topological structure of another electric energy router is provided, in the present embodiment, an upper bridge arm unit in a bridge arm unit of the electric energy router is composed of a bridge arm reactor, N conventional submodules, and K hybrid direct current submodules, and a lower bridge arm unit is composed of a bridge arm reactor, N conventional submodules, and K hybrid alternating current submodules, so that the total number of the submodules of the upper and lower bridge arm units is consistent in order to ensure that the capacitance and voltage between the upper and lower bridge arm units are balanced; the phase unit is formed by connecting an upper bridge arm unit and a lower bridge arm unit in series. Under the condition that the direct current output ends of the plurality of mixed direct current submodules are connected in series and in series-parallel to form the low-voltage direct current ports in the multifunctional high-integration compact electric energy router, the number of the low-voltage direct current ports in the multifunctional high-integration compact electric energy router is multiple. As shown in fig. 10, a first end 601 and a second end 602 of the dc output port of the hybrid dc sub-module No. 1 HDCSM1 in the a lower arm unit form a medium-low voltage dc port; a DC output port of a No. 1 hybrid DC submodule HDCSM1 and a DC output port of a No. 2 hybrid DC submodule HDCSM2 in a lower bridge arm unit B are connected in series, and a middle-low voltage DC port is also formed by a first end 603 of the DC output port of the No. 1 hybrid DC submodule HDCSM1 and a second end 604 of the DC output port of the No. 2 hybrid DC submodule HDCSMK. No. 1, No. 2 to No. K hybrid direct current sub-module HDCSM1 direct current output ports in the lower bridge arm unit C are connected in series, and a middle-low voltage direct current port is formed by a first end 605 of the direct current output port of the No. 1 hybrid direct current sub-module HDCSM1 and a second end 606 of the direct current output port of the No. K hybrid direct current sub-module HDCSM K. In the figure the utility model discloses well low-voltage direct current port voltage class is decided by power device IGBT parameter, submodule piece connected mode, port extraction mode.

The alternating current output ends of the multiple mixed alternating current submodules are connected in series, in parallel and in series-parallel to form a low-voltage alternating current port in the multifunctional high-integration compact electric energy router in many ways. As shown in fig. 10, the alternating current output ports of the hybrid alternating current submodules haccm 1 from No. 1 to No. 2 of the upper bridge arm unit of each phase of the electric energy router are connected in series, the first ends 607, 608 and 609 of the alternating current output ports of the hybrid alternating current submodules haccm 1 of each upper bridge arm unit are led out to be respectively used as three-phase alternating current output ports, and the second ends of the alternating current output ports of the hybrid alternating current submodules hacmk of each upper bridge arm unit are connected to form a neutral point 610 to form a medium-low voltage alternating current port in a star connection manner. In the figure the utility model discloses well low voltage exchanges port voltage class is decided by power device IGBT parameter, submodule piece connected mode, port extraction mode.

As shown in fig. 11, another topology structure of the electric energy router is provided, and when the dc output terminals of the multiple hybrid dc sub-modules are connected in parallel to form the low-voltage dc ports in the multifunctional high-integration compact electric energy router, the number of the low-voltage dc ports in the multifunctional high-integration compact electric energy router is 1. As shown in fig. 11, in the present embodiment, all the hybrid dc sub-modules of the lower bridge arm unit of the electric energy router are connected in parallel, the first ends of the hybrid dc sub-modules are connected to form 611, the second ends of the hybrid dc sub-modules are connected to form 612, and the terminals 611 and 612 form a medium-low voltage dc output port.

As shown in FIG. 11, the AC output ports of the mixed AC submodules HACSM1 from No. 1, No. 2 to No. K of the bridge arm units on each phase of the electric energy router are connected in series, the first end 613 of the AC output port of the mixed AC submodule HACSM1 from No. 1 of the bridge arm unit on the phase A is connected with the second end 618 of the AC output port of the mixed AC submodule HACSM K of the bridge arm unit on the phase C, the first end 615 of the AC output port of the mixed AC submodule HACSM1 of the bridge arm unit on the phase B is connected with the second end 614 of the AC output port of the mixed AC submodule HACSM1 of the bridge arm unit on the phase A, the first end 617 of the AC output port of the mixed AC submodule HACSM1 of the bridge arm unit on the phase C is connected with the second end 616 of the AC output port of the mixed AC submodule HACSM 36K of the bridge arm unit on the phase B, and the AC output ports of the mixed AC submodules HACSM1 from No. 1 to No. 613, 2 and K of the bridge arm units on each phase, 615. 617 a three-phase ac output port, and a medium/low voltage ac port formed by connecting the three phases in an angular shape.

It should be noted that the utility model provides a pair of electric energy router's well low pressure AC/DC port draws forth the mode various, including but not limited to the embodiment of the utility model provides an in the mentioned mode, mix the mode that submodule piece output was established ties, is parallelly connected or the series-parallel connection draws forth well low pressure AC/DC port with any form, all belong to this patent protection scope.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious changes and modifications can be made without departing from the scope of the invention.

Claims (9)

1. An electrical 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 alternating current port of the corresponding phase unit;

each high-voltage alternating current port is respectively connected with an alternating current power supply of a corresponding phase;

the three phase units are connected in parallel to form a high-voltage direct-current port;

each bridge arm unit is formed by connecting bridge arm reactors, power module units and a plurality of mixed alternating current submodules in series;

and different numbers of mixed alternating current submodules are connected into each phase unit to form alternating current ports with different voltage levels of the corresponding phase unit.

2. The electrical energy router of claim 1, wherein the power module unit comprises a plurality of series-connected power sub-modules;

the power sub-modules include half-bridge sub-modules or full-bridge sub-modules.

3. The electrical energy router of claim 2 wherein each leg unit is further connected in series with a plurality of hybrid dc submodules;

different voltage class direct current ports are formed by connecting different numbers of mixed direct current submodules.

4. The power router of claim 3, further comprising a controller,

the controller is connected with each direct current port, each alternating current port, each power submodule, each mixed direct current submodule and each mixed alternating current submodule and used for controlling the working state of each submodule so as to realize the conversion of output voltages of a plurality of direct current ports with different voltage grades or a plurality of alternating current ports with different voltage grades.

5. The power router of claim 3,

the direct current output ends of the plurality of mixed direct current submodules are connected in any one of series connection, parallel connection and series-parallel connection;

the alternating current output ends of the mixed alternating current submodules in the phase units are connected in any one of series connection, parallel connection and series-parallel connection.

6. The electrical energy router of claim 2 wherein the half-bridge submodules comprise 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 circuit;

the IGBT device series branch, the resistor and the direct current capacitor are connected in parallel;

the thyristor is connected with any one of the two IGBT devices in parallel, the anode of the thyristor is connected with the negative electrode of the direct current capacitor, the cathode of the thyristor is connected with the collector electrode of the IGBT device in parallel, the cathode of the thyristor leads out the positive output of the half-bridge submodule, and the anode leads out the negative output of the half-bridge submodule.

7. The electrical energy router of claim 2 wherein the full-bridge sub-module comprises a DC capacitor, four IGBT devices, a resistor, wherein,

the four IGBT devices are connected in series in pairs to form two series branch circuits of the IGBT devices;

the series connection points in the two IGBT device series branches are respectively used as the positive electrode output and the negative electrode output of the full-bridge sub-module.

8. The electrical energy router of claim 3, wherein the hybrid DC sub-module comprises: a first pre-stage circuit and a post-stage isolated DC/DC converter circuit, wherein,

the first pre-stage circuit is any one of the half-bridge sub-module or the full-bridge sub-module, the first pre-stage circuit comprises a direct-current capacitor, and the anode and the cathode of the direct-current capacitor of the first pre-stage circuit are connected with the first end of the post-stage isolation type DC/DC converter;

the rear-stage isolation type DC/DC converter is any one of an isolation type double-active-bridge DAB converter or an isolation type resonant converter, and the second end of the rear-stage isolation type DC/DC converter is used as the direct current output end of the mixed direct current sub-module.

9. The electrical energy router of claim 2, wherein the hybrid AC submodule includes a second pre-stage circuit and a post-stage inverter circuit, wherein,

the second pre-stage circuit comprises a direct current capacitor, and the anode and the cathode of the direct current capacitor in the second pre-stage circuit are connected with the direct current end of the post-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 comprises a full-bridge inverter circuit and a single-phase isolation transformer, wherein a first end winding of the single-phase isolation transformer is connected with an alternating current end of the full-bridge inverter circuit, and a second end winding of the single-phase isolation transformer is used as an alternating current output end of the hybrid alternating current sub-module;

the two-stage inverter circuit comprises an isolated double-active-bridge DAB converter or an isolated resonant converter, and a full-bridge topological circuit, wherein the direct current end of the full-bridge inverter circuit is connected with the output end of any one of the isolated double-active-bridge DAB converter or the isolated resonant converter, and the alternating current end of the full-bridge inverter circuit is used as the alternating current output end of the hybrid alternating current sub-module.

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