CN112653149A - High-power electric energy router suitable for low-voltage distribution network - Google Patents
High-power electric energy router suitable for low-voltage distribution network Download PDFInfo
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- CN112653149A CN112653149A CN202011322000.5A CN202011322000A CN112653149A CN 112653149 A CN112653149 A CN 112653149A CN 202011322000 A CN202011322000 A CN 202011322000A CN 112653149 A CN112653149 A CN 112653149A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/02—Circuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of ac power and of dc power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
Abstract
The invention discloses a high-power electric energy router suitable for a low-voltage distribution network, which comprises a first DC/AC converter, a second DC/AC converter, a transformer, an alternating current bus, a direct current bus, a low-voltage distribution network alternating current interface, an energy storage device interface, a distributed power supply interface, a plurality of alternating current load interfaces and a plurality of direct current load interfaces, wherein the first DC/AC converter is connected with the first DC/AC converter through the first DC/AC converter; two ends of the primary side of the transformer are respectively connected with the alternating-current interface and the alternating-current bus of the low-voltage distribution network, and two ends of the secondary side of the transformer are respectively connected with the alternating-current side of the first DC/AC converter and a system neutral point; the alternating current side of the second DC/AC converter is connected with the alternating current bus; the direct current side of the first DC/AC converter and the direct current side of the second DC/AC converter are both connected with a direct current bus; compared with the prior art, the invention can ensure that the energy of the electric energy router operates under the condition of being greater than the rated power of the system, thereby greatly enhancing the transmission capability of the energy of the router.
Description
Technical Field
The invention relates to the technical field of electric energy routers, in particular to a high-power electric energy router suitable for a low-voltage distribution network.
Background
With the continuous development and maturity of new energy power generation technology, the permeability level of the new energy power generation technology in a power system is higher and higher, so that the grid-connected operation of a large-scale distributed power supply becomes one of the main characteristics of a future smart grid. In order to stabilize the problem of power fluctuation caused by the access of a distributed power supply, realize the timely consumption of new energy and the peak clipping and valley filling of a power grid, the power grid needs to be accessed with an energy storage device represented by a battery and a super capacitor, so that the diversified energy power generation is another main characteristic of a future intelligent power grid. In order to meet the development requirements of a future smart power grid, the electric energy router has the characteristics of multi-source coupling and multi-load coupling operation, can provide plug-and-play electric interfaces in various forms for a distributed power supply, an alternating current load and a direct current load of an energy storage device, and realizes coordination control of various energy sources and adjustment of energy flow direction and size.
In the prior art, an electric energy router designed for a medium-high voltage distribution network is generally used, and an energy control core unit of the electric energy router adopts a Power Electronic Transformer (PET) composed of a three-stage series structure of an input stage AC/DC converter, an intermediate stage DC/DC converter and an output stage DC/AC converter, such as patent nos. CN201710261487, CN201811406738, CN201910348552, CN 201919006185, and the like.
However, for the low-voltage distribution network, since the voltage at the alternating-current interface and the alternating-current load interface of the low-voltage distribution network of the electric energy router are both 380V, the energy routing function can be realized without a PET (positron emission tomography) intermediate-stage DC/DC converter. Therefore, the transformation structure of the energy control core unit of the electric energy router can be reduced from three levels to two levels, the reliability of the system is further improved, and the stability and the safety of the system operation are improved.
In addition, because the PET can only transmit energy for the alternating current load through the output stage DC/AC converter, in the prior art, the active power and the reactive power transmitted by the power router are both limited within the rated power range of the output stage DC/AC converter, that is, within the rated power range of the system. Further, the prior art can only achieve higher energy transmission capability by increasing the capacity of PET.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a high-power electric energy router suitable for a low-voltage power distribution network, and solve the problem that the transmission capacity of active power and reactive power is limited within the rated power range of a system and the high-power transmission of energy cannot be realized in the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a high-power electric energy router suitable for a low-voltage distribution network comprises a first DC/AC converter, a second DC/AC converter, a transformer, an alternating current bus, a direct current bus, a low-voltage distribution network alternating current interface, an energy storage device interface, a distributed power supply interface, a plurality of alternating current load interfaces and a plurality of direct current load interfaces;
two ends of the primary side of the transformer are respectively connected with an alternating-current interface and an alternating-current bus of a low-voltage distribution network, and two ends of the secondary side of the transformer are respectively connected with an alternating-current side of the first DC/AC converter and a system neutral point; the alternating current side of the second DC/AC converter is connected with an alternating current bus; the direct current side of the first DC/AC converter and the direct current side of the second DC/AC converter are both connected with a direct current bus; the alternating current bus is connected with a plurality of alternating current load interfaces; and the direct current bus is respectively connected with the energy storage device interface, the distributed power supply interface and the plurality of direct current load interfaces.
The technical scheme of the invention is further improved as follows: the first DC/AC converter adopts a three-phase half-bridge circuit topology and a DC bus capacitor CdcThe positive polarity end of the first bridge arm is connected with a switching tube S1Upper end of (D.C. bus capacitor C)dcThe negative polarity end of the first bridge arm is connected with a lower switch tube S of the first bridge arm2The switch tube S on the first bridge arm1Lower end of and first bridge lower switch tube S2Is connected with a first filter inductor L after being connected in parallel1aOne end of (A)Said first filter inductance L1aThe other end of the second end is connected with the secondary side of the transformer; switch tube S on second bridge arm3The upper end of the first bridge arm is connected with a switch tube S1Upper end of (1), second bridge lower switch tube S4Lower end of and first bridge lower switch tube S2Is connected with the lower end of the first bridge arm, and the switching tube S is arranged on the second bridge arm3Lower end of and a second bridge lower switch tube S4Is connected with a second filter inductor L after being connected in parallel at the upper end1bOne terminal of (1), a second filter inductance L1bThe other end of the second end is connected with the secondary side of the transformer; switch tube S on third bridge arm5Upper end of and a switching tube S on the second bridge arm3Upper end of the third bridge arm is connected with a lower switch tube S of the third bridge arm6Lower end of and a second bridge lower switch tube S4Is connected with the lower end of the third bridge arm, and the switching tube S is arranged on the third bridge arm5Lower end of and third bridge arm lower switch tube S6Is connected with a third filter inductor L after being connected in parallel at the upper end1cSaid third filter inductance L1cThe other end of the second end is connected with the secondary side of the transformer.
The technical scheme of the invention is further improved as follows: the second DC/AC converter adopts a three-phase half-bridge circuit topology and a DC bus capacitor CdcThe positive polarity end of the first bridge arm is connected with a switching tube S on the fourth bridge arm7Upper end of (D.C. bus capacitor C)dcThe negative polarity end of the first bridge arm is connected with a fourth bridge arm lower switch tube S8The fourth bridge arm is provided with a switching tube S7Lower end of and a fourth bridge lower switching tube S8Is connected with a fourth filter inductor L after being connected in parallel at the upper end2aSaid fourth filter inductance L2aAnd the other end of the first filter capacitor C2aOne end of the first connecting wire is connected with an alternating current bus after being connected in parallel; switch tube S on fifth bridge arm9Upper end of and a switch tube S on the fourth bridge arm7Upper end of the fifth bridge arm is connected with a switching tube S10Lower end of and fourth bridge arm lower switch tube S8Is connected with the lower end of the fifth bridge arm, and the switching tube S is arranged on the fifth bridge arm9Lower end of and a fifth bridge lower switching tube S10Is connected with a fifth filter inductor L after being connected in parallel2bOf said fifth filter inductance L2bAnd the other end of the second filter capacitor C2bOne end of the first connecting wire is connected with an alternating current bus after being connected in parallel; switch tube S on sixth bridge arm11Upper end of and a switching tube S on the fifth bridge arm9Upper end of the sixth bridge arm is connected with a switching tube S12Lower end of and a fifth bridge lower switching tube S10Is connected with the lower end of the sixth bridge arm, and the switching tube S is arranged on the sixth bridge arm11Lower end of and sixth bridge lower switch tube S12Is connected with a sixth filter inductor L after being connected in parallel2cSaid sixth filter inductance L2cAnd the other end of the third filter capacitor C2cOne end of the first connecting wire is connected with an alternating current bus after being connected in parallel; the first filter capacitor C2aThe other end of the first filter capacitor C2bAnd the other end of the third filter capacitor C2cAnd the other ends of the two are connected in parallel and then connected to a neutral point of the system.
The technical scheme of the invention is further improved as follows: the active power of the alternating current load is obtained through a first path and a second path, wherein the first path is used for inputting first alternating current active power P from a low-voltage distribution network through an alternating current interface of the low-voltage distribution network1Then, the first AC active power P is provided for the AC load through the transformer, the AC bus and a plurality of AC load interfaces1(ii) a And the second path outputs second alternating current active power P through the direct current bus and the second DC/AC converter after the energy storage device passes through the energy storage device interface and the distributed power supply passes through the distributed power supply interface2And then provides a second AC active power P for the AC load through the AC bus and a plurality of AC load interfaces2Said AC load active power PLAC＝P1+P2。
The technical scheme of the invention is further improved as follows: the first AC maximum active power P1maxEqual to rated active power PRSaid second AC maximum active power P2maxEqual to rated active power PRSaid AC load maximum active power PLACmax＝2PR。
The technical scheme of the invention is further improved as follows: the active power of the direct current load is obtained through a third path and a fourth path, wherein the third path is formed byThe low-voltage distribution network inputs a first direct current active power P through an alternating current interface of the low-voltage distribution network3Providing a first DC active power P to a DC load via a transformer, a second DC/AC converter, a DC bus and a plurality of DC load interfaces3(ii) a The fourth path outputs second direct current active power P through the direct current bus after the energy storage device passes through the energy storage device interface and the distributed power supply passes through the distributed power supply interface4Then, a second DC active power P is provided for the DC load through a plurality of DC load interfaces4Said DC load active power PLDC＝P3+P4。
The technical scheme of the invention is further improved as follows: the first DC maximum active power P3maxEqual to rated active power PRSaid second DC maximum active power P4maxEqual to rated active power PRThe maximum active power P of the DC loadLDCmax＝2PR。
The technical scheme of the invention is further improved as follows: the reactive power of the alternating current load is obtained through a fifth path and a sixth path, and the fifth path outputs first alternating current reactive power Q by the first DC/AC converter1Then, the first AC reactive power Q is provided for the AC load through the transformer, the AC bus and a plurality of AC load interfaces1(ii) a The sixth path outputs a second alternating current reactive power Q by a second DC/AC converter2And then providing a second reactive power Q for the AC load through the AC bus and the plurality of AC load interfaces2Said AC load reactive power QLAC＝Q1+Q2。
The technical scheme of the invention is further improved as follows: the first AC maximum reactive power Q1maxEqual to the maximum capacity Q of the transformerTrSaid second AC reactive power Q2Equal to rated reactive power QRMaximum reactive power Q of said AC loadLACmax＝QTr+QR。
Due to the adoption of the technical scheme, the invention has the technical progress that:
1. the active power of the alternating current load and the direct current load and the reactive power of the alternating current load can be transmitted by two paths at the same time, so that the energy transmission capability of the router is greatly enhanced, and the problem that the transmission capability of the active power and the reactive power of the router is limited within the rated power range of a system and the high-power transmission of energy cannot be realized in the prior art is solved;
2. the router energy control core unit can realize the energy routing function without a PET middle-stage DC/DC converter, only adopts a first DC/AC converter and a second DC/AC converter two-stage conversion structure, and active power and reactive power transmitted by the electric energy router can be transmitted by two paths at the same time, so that the requirement that the energy of the electric energy router is transmitted by more than the rated power of a system can be met, and the purposes of reducing the conversion stages of the system and enhancing the operation reliability of the system can be realized.
Drawings
FIG. 1 is a schematic structural diagram of a high-power electric energy router suitable for a low-voltage distribution network according to the present invention;
FIG. 2 is a schematic diagram of a three-phase first DC/AC converter according to the present invention;
FIG. 3 is a schematic diagram of a three-phase second DC/AC converter according to the present invention;
FIG. 4 is a schematic diagram of the AC load active power operation of the present invention;
FIG. 5 is a schematic diagram of the DC load active power operation of the present invention;
fig. 6 is a schematic diagram of the ac load reactive power operation of the present invention.
Wherein S is1: switching tube on the first bridge arm, S2: first bridge underarm switch tube, S3: switching tube on the second bridge arm, S4: second bridge underarm switch tube, S5: switching tube on the third arm, S6: third underarm switch tube, S7: switching tube on the fourth arm, S8: fourth underarm switch tube, S9: switching tube on the fifth arm, S10: fifth underarm switch tube, S11: switching tube on the sixth arm, S12: a sixth underarm switch tube, L1a: first filter inductor, L1b: the second filter inductance is set at the second end of the filter,L1c: third filter inductance, L2a: fourth filter inductance, L2b: fifth filter inductance, L2c: sixth filter inductance, Cdc: DC bus capacitor, C2a: a first filter capacitor, C2b: a second filter capacitor, C2c: third filter capacitor, P1: first ac active power, P2: second ac active power, P3: first direct current active power, P4: second DC active power, PLAC: active power of AC load, PLDC: active power of DC load, PR: rated active power, P1max: first ac maximum active power, P2max: second ac maximum active power, P3max: first direct current maximum active power, P4max: second DC maximum active power, PLACmax: maximum active power of AC load, PLDCmax: maximum active power, Q, of the DC load1: first ac reactive power, Q2: second ac reactive power, QLAC: AC load reactive power, Q1max: first maximum AC reactive power, QTr: maximum capacity, Q, of a transformerR: rated reactive power, QLACmax: the maximum reactive power of the alternating current load.
Detailed Description
The present invention will be described in further detail with reference to the following examples:
as shown in fig. 1, a high-power electric energy router suitable for a low-voltage distribution network is characterized in that: the electric energy router comprises a first DC/AC converter, a second DC/AC converter, a transformer, an alternating current bus, a direct current bus, a low-voltage distribution network alternating current interface, an energy storage device interface, a distributed power supply interface, a plurality of alternating current load interfaces and a plurality of direct current load interfaces;
two ends of the primary side of the transformer are respectively connected with an alternating-current interface and an alternating-current bus of a low-voltage distribution network, and two ends of the secondary side of the transformer are respectively connected with an alternating-current side of the first DC/AC converter and a system neutral point; the alternating current side of the second DC/AC converter is connected with an alternating current bus; the direct current side of the first DC/AC converter and the direct current side of the second DC/AC converter are both connected with a direct current bus; the alternating current bus is connected with a plurality of alternating current load interfaces; and the direct current bus is respectively connected with the energy storage device interface, the distributed power supply interface and the plurality of direct current load interfaces.
As shown in fig. 2: the first DC/AC converter adopts a three-phase half-bridge circuit topology and a DC bus capacitor CdcThe positive polarity end of the first bridge arm is connected with a switching tube S1Upper end of (D.C. bus capacitor C)dcThe negative polarity end of the first bridge arm is connected with a lower switch tube S of the first bridge arm2The switch tube S on the first bridge arm1Lower end of and first bridge lower switch tube S2Is connected with a first filter inductor L after being connected in parallel1aSaid first filter inductance L1aThe other end of the second end is connected with the secondary side of the transformer; switch tube S on second bridge arm3The upper end of the first bridge arm is connected with a switch tube S1Upper end of (1), second bridge lower switch tube S4Lower end of and first bridge lower switch tube S2Is connected with the lower end of the first bridge arm, and the switching tube S is arranged on the second bridge arm3Lower end of and a second bridge lower switch tube S4Is connected with a second filter inductor L after being connected in parallel at the upper end1bOne terminal of (1), a second filter inductance L1bThe other end of the second end is connected with the secondary side of the transformer; switch tube S on third bridge arm5Upper end of and a switching tube S on the second bridge arm3Upper end of the third bridge arm is connected with a lower switch tube S of the third bridge arm6Lower end of and a second bridge lower switch tube S4Is connected with the lower end of the third bridge arm, and the switching tube S is arranged on the third bridge arm5Lower end of and third bridge arm lower switch tube S6Is connected with a third filter inductor L after being connected in parallel at the upper end1cSaid third filter inductance L1cThe other end of the second end is connected with the secondary side of the transformer.
As shown in fig. 3: the second DC/AC converter adopts a three-phase half-bridge circuit topology and a DC bus capacitor CdcThe positive polarity end of the first bridge arm is connected with a switching tube S on the fourth bridge arm7Upper end of (D.C. bus capacitor C)dcThe negative polarity end of the first bridge arm is connected with a fourth bridge arm lower switch tube S8A lower end of saidSwitch tube S on fourth bridge arm7Lower end of and a fourth bridge lower switching tube S8Is connected with a fourth filter inductor L after being connected in parallel at the upper end2aSaid fourth filter inductance L2aAnd the other end of the first filter capacitor C2aOne end of the first connecting wire is connected with an alternating current bus after being connected in parallel; switch tube S on fifth bridge arm9Upper end of and a switch tube S on the fourth bridge arm7Upper end of the fifth bridge arm is connected with a switching tube S10Lower end of and fourth bridge arm lower switch tube S8Is connected with the lower end of the fifth bridge arm, and the switching tube S is arranged on the fifth bridge arm9Lower end of and a fifth bridge lower switching tube S10Is connected with a fifth filter inductor L after being connected in parallel2bOf said fifth filter inductance L2bAnd the other end of the second filter capacitor C2bOne end of the first connecting wire is connected with an alternating current bus after being connected in parallel; switch tube S on sixth bridge arm11Upper end of and a switching tube S on the fifth bridge arm9Upper end of the sixth bridge arm is connected with a switching tube S12Lower end of and a fifth bridge lower switching tube S10Is connected with the lower end of the sixth bridge arm, and the switching tube S is arranged on the sixth bridge arm11Lower end of and sixth bridge lower switch tube S12Is connected with a sixth filter inductor L after being connected in parallel2cSaid sixth filter inductance L2cAnd the other end of the third filter capacitor C2cOne end of the first connecting wire is connected with an alternating current bus after being connected in parallel; the first filter capacitor C2aThe other end of the first filter capacitor C2bAnd the other end of the third filter capacitor C2cAnd the other ends of the two are connected in parallel and then connected to a neutral point of the system.
The first DC/AC converter and the second DC/AC converter can realize bidirectional energy transmission and respectively have the function of controlling the current at the alternating current interface of the low-voltage distribution network and the voltage and the power quality at the alternating current bus interface.
Different from the prior art, the invention can simultaneously transmit active power to alternating current load and direct current load through two energy paths, specifically:
as shown in fig. 4: the AC load energy supply aspect: the active power of the AC load is obtained through a first path and a second path, wherein the first pathThe first AC active power P is input from the low-voltage distribution network via the AC interface of the low-voltage distribution network1Then, the first AC active power P is provided for the AC load through the transformer, the AC bus and a plurality of AC load interfaces1(ii) a And the second path outputs second alternating current active power P through the direct current bus and the second DC/AC converter after the energy storage device passes through the energy storage device interface and the distributed power supply passes through the distributed power supply interface2And then provides a second AC active power P for the AC load through the AC bus and the AC load interface2Said AC load active power PLAC＝P1+P2. The first AC maximum active power P1maxEqual to rated active power PRSaid second AC maximum active power P2maxEqual to rated active power PRSaid AC load maximum active power PLACmax＝2PR。
As shown in fig. 5: the active power of the direct current load is obtained through a third path and a fourth path, and the third path inputs the first direct current active power P from the low-voltage distribution network through an alternating current interface of the low-voltage distribution network3Providing a first DC active power P to a DC load via a transformer, a second DC/AC converter, a DC bus and a plurality of DC load interfaces3(ii) a The fourth path outputs second direct current active power P through the direct current bus after the energy storage device passes through the energy storage device interface and the distributed power supply passes through the distributed power supply interface4Then, a second DC active power P is provided for the DC load through a plurality of DC load interfaces4Said DC load active power PLDC＝P3+P4. The first DC maximum active power P3maxEqual to rated active power PRSaid second DC maximum active power P4maxEqual to rated active power PRThe maximum active power P of the DC loadLDCmax＝2PR。
Therefore, the active power of the alternating current load and the active power of the direct current load can be transmitted through two paths at the same time, so that the electric energy router system can provide 2 times of rated active power for the alternating current load and the direct current load at most, and the transmission capability of the active power of the router is greatly enhanced.
Furthermore, the second DC/AC converter itself in the present invention has the capability of transmitting the rated reactive power of the system, and the first DC/AC converter can have the capability of transmitting the reactive power to the AC load by controlling the phase angle of the voltage across the AC bus through the second DC/AC converter, thereby adjusting the phase angle of the voltage across the transformer. Therefore, the invention can transmit reactive power to the alternating current load through two energy paths at the same time, specifically:
as shown in fig. 6: the reactive power of the alternating current load is obtained through a fifth path and a sixth path, and the fifth path outputs first alternating current reactive power Q by the first DC/AC converter1Then, the first AC reactive power Q is provided for the AC load through the transformer, the AC bus and a plurality of AC load interfaces1(ii) a The sixth path outputs a second alternating current reactive power Q by a second DC/AC converter2And then providing a second reactive power Q for the AC load through the AC bus and the plurality of AC load interfaces2Said AC load reactive power QLAC＝Q1+Q2. The first AC maximum reactive power Q1maxEqual to the maximum capacity Q of the transformerTrSaid second AC reactive power Q2Equal to rated reactive power QRMaximum reactive power Q of said AC loadLACmax＝QTr+QR。
Therefore, the reactive power of the alternating current load can be transmitted by two paths at the same time, so that the electric energy router system can provide the maximum Q for the alternating current loadTr+QRThereby greatly enhancing the transmission capability of the router reactive power.
Claims (9)
1. The utility model provides a high-power electric energy router suitable for low voltage distribution network which characterized in that: the electric energy router comprises a first DC/AC converter, a second DC/AC converter, a transformer, an alternating current bus, a direct current bus, a low-voltage distribution network alternating current interface, an energy storage device interface, a distributed power supply interface, a plurality of alternating current load interfaces and a plurality of direct current load interfaces;
two ends of the primary side of the transformer are respectively connected with an alternating-current interface and an alternating-current bus of a low-voltage distribution network, and two ends of the secondary side of the transformer are respectively connected with an alternating-current side of the first DC/AC converter and a system neutral point; the alternating current side of the second DC/AC converter is connected with an alternating current bus; the direct current side of the first DC/AC converter and the direct current side of the second DC/AC converter are both connected with a direct current bus; the alternating current bus is connected with a plurality of alternating current load interfaces; and the direct current bus is respectively connected with the energy storage device interface, the distributed power supply interface and the plurality of direct current load interfaces.
2. A high power electric energy router suitable for low voltage distribution networks according to claim 1, characterized in that: the first DC/AC converter adopts a three-phase half-bridge circuit topology and a DC bus capacitor CdcThe positive polarity end of the first bridge arm is connected with a switching tube S1Upper end of (D.C. bus capacitor C)dcThe negative polarity end of the first bridge arm is connected with a lower switch tube S of the first bridge arm2The switch tube S on the first bridge arm1Lower end of and first bridge lower switch tube S2Is connected with a first filter inductor L after being connected in parallel1aSaid first filter inductance L1aThe other end of the second end is connected with the secondary side of the transformer; switch tube S on second bridge arm3The upper end of the first bridge arm is connected with a switch tube S1Upper end of (1), second bridge lower switch tube S4Lower end of and first bridge lower switch tube S2Is connected with the lower end of the first bridge arm, and the switching tube S is arranged on the second bridge arm3Lower end of and a second bridge lower switch tube S4Is connected with a second filter inductor L after being connected in parallel at the upper end1bOne terminal of (1), a second filter inductance L1bThe other end of the second end is connected with the secondary side of the transformer; switch tube S on third bridge arm5Upper end of and a switching tube S on the second bridge arm3Upper end of the third bridge arm is connected with a lower switch tube S of the third bridge arm6Lower end of and a second bridge lower switch tube S4Is connected with the lower end of the third bridge arm, and the switching tube S is arranged on the third bridge arm5Lower end of and third bridge arm lower switch tube S6Is connected with a third filter inductor L after being connected in parallel at the upper end1cOne end of, the third filteringInductor L1cThe other end of the second end is connected with the secondary side of the transformer.
3. A high power electric energy router suitable for low voltage distribution networks according to claim 1, characterized in that: the second DC/AC converter adopts a three-phase half-bridge circuit topology and a DC bus capacitor CdcThe positive polarity end of the first bridge arm is connected with a switching tube S on the fourth bridge arm7Upper end of (D.C. bus capacitor C)dcThe negative polarity end of the first bridge arm is connected with a fourth bridge arm lower switch tube S8The fourth bridge arm is provided with a switching tube S7Lower end of and a fourth bridge lower switching tube S8Is connected with a fourth filter inductor L after being connected in parallel at the upper end2aSaid fourth filter inductance L2aAnd the other end of the first filter capacitor C2aOne end of the first connecting wire is connected with an alternating current bus after being connected in parallel; switch tube S on fifth bridge arm9Upper end of and a switch tube S on the fourth bridge arm7Upper end of the fifth bridge arm is connected with a switching tube S10Lower end of and fourth bridge arm lower switch tube S8Is connected with the lower end of the fifth bridge arm, and the switching tube S is arranged on the fifth bridge arm9Lower end of and a fifth bridge lower switching tube S10Is connected with a fifth filter inductor L after being connected in parallel2bOf said fifth filter inductance L2bAnd the other end of the second filter capacitor C2bOne end of the first connecting wire is connected with an alternating current bus after being connected in parallel; switch tube S on sixth bridge arm11Upper end of and a switching tube S on the fifth bridge arm9Upper end of the sixth bridge arm is connected with a switching tube S12Lower end of and a fifth bridge lower switching tube S10Is connected with the lower end of the sixth bridge arm, and the switching tube S is arranged on the sixth bridge arm11Lower end of and sixth bridge lower switch tube S12Is connected with a sixth filter inductor L after being connected in parallel2cSaid sixth filter inductance L2cAnd the other end of the third filter capacitor C2cOne end of the first connecting wire is connected with an alternating current bus after being connected in parallel; the first filter capacitor C2aThe other end of the first filter capacitor C2bAnd the other end of the third filter capacitor C2cAnd the other ends of the two are connected in parallel and then connected to a neutral point of the system.
4. A high power electric energy router suitable for low voltage distribution networks according to claim 1, characterized in that: the active power of the alternating current load is obtained through a first path and a second path, wherein the first path is used for inputting first alternating current active power P from a low-voltage distribution network through an alternating current interface of the low-voltage distribution network1Then, the first AC active power P is provided for the AC load through the transformer, the AC bus and a plurality of AC load interfaces1(ii) a And the second path outputs second alternating current active power P through the direct current bus and the second DC/AC converter after the energy storage device passes through the energy storage device interface and the distributed power supply passes through the distributed power supply interface2And then provides a second AC active power P for the AC load through the AC bus and a plurality of AC load interfaces2Said AC load active power PLAC＝P1+P2。
5. A high power electric energy router suitable for low voltage distribution network according to claim 4 characterized in that: the first AC maximum active power P1maxEqual to rated active power PRSaid second AC maximum active power P2maxEqual to rated active power PRSaid AC load maximum active power PLACmax＝2PR。
6. A high power electric energy router suitable for low voltage distribution networks according to claim 1, characterized in that: the active power of the direct current load is obtained through a third path and a fourth path, and the third path inputs the first direct current active power P from the low-voltage distribution network through an alternating current interface of the low-voltage distribution network3Providing a first DC active power P to a DC load via a transformer, a second DC/AC converter, a DC bus and a plurality of DC load interfaces3(ii) a The fourth path outputs second direct current active power P through the direct current bus after the energy storage device passes through the energy storage device interface and the distributed power supply passes through the distributed power supply interface4Then, a second DC active power P is provided for the DC load through a plurality of DC load interfaces4SaidActive power P of DC loadLDC＝P3+P4。
7. A high power electric energy router suitable for low voltage distribution networks according to claim 6, characterized in that: the first DC maximum active power P3maxEqual to rated active power PRSaid second DC maximum active power P4maxEqual to rated active power PRThe maximum active power P of the DC loadLDCmax＝2PR。
8. A high power electric energy router suitable for low voltage distribution networks according to claim 1, characterized in that: the reactive power of the alternating current load is obtained through a fifth path and a sixth path, and the fifth path outputs first alternating current reactive power Q by the first DC/AC converter1Then, the first AC reactive power Q is provided for the AC load through the transformer, the AC bus and a plurality of AC load interfaces1(ii) a The sixth path outputs a second alternating current reactive power Q by a second DC/AC converter2And then providing a second reactive power Q for the AC load through the AC bus and the plurality of AC load interfaces2Said AC load reactive power QLAC＝Q1+Q2。
9. A high power electric energy router suitable for low voltage distribution networks according to claim 8, characterized in that: the first AC maximum reactive power Q1maxEqual to the maximum capacity Q of the transformerTrSaid second AC reactive power Q2Equal to rated reactive power QRMaximum reactive power Q of said AC loadLACmax＝QTr+QR。
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113890035A (en) * | 2021-09-28 | 2022-01-04 | 燕山大学 | Multi-mode unified control method based on series-parallel electric energy router |
| CN113890570A (en) * | 2021-10-29 | 2022-01-04 | 上海大周能源技术有限公司 | Power carrier communication system and communication method for electric energy router of direct-current microgrid |
| CN116316912A (en) * | 2023-03-31 | 2023-06-23 | 燕山大学 | Electric energy router power control method based on double-degree-of-freedom multi-constraint relation |
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2020
- 2020-11-23 CN CN202011322000.5A patent/CN112653149A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113890035A (en) * | 2021-09-28 | 2022-01-04 | 燕山大学 | Multi-mode unified control method based on series-parallel electric energy router |
| CN113890570A (en) * | 2021-10-29 | 2022-01-04 | 上海大周能源技术有限公司 | Power carrier communication system and communication method for electric energy router of direct-current microgrid |
| CN116316912A (en) * | 2023-03-31 | 2023-06-23 | 燕山大学 | Electric energy router power control method based on double-degree-of-freedom multi-constraint relation |
| CN116316912B (en) * | 2023-03-31 | 2023-08-15 | 燕山大学 | Electric energy router power control method based on double-degree-of-freedom multi-constraint relation |
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