CN112134286A - Alternating current-direct current hybrid micro-grid - Google Patents
Alternating current-direct current hybrid micro-grid Download PDFInfo
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- CN112134286A CN112134286A CN202011001216.1A CN202011001216A CN112134286A CN 112134286 A CN112134286 A CN 112134286A CN 202011001216 A CN202011001216 A CN 202011001216A CN 112134286 A CN112134286 A CN 112134286A
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Inverter Devices (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses an alternating current-direct current hybrid micro-grid, which comprises a power electronic transformer with a plurality of ports, wherein each port is connected with a bus; the bus at least comprises a direct current bus and an alternating current bus, the port comprises a direct current port and an alternating current port, the direct current bus is correspondingly connected with the direct current port, and the alternating current bus is correspondingly connected with the alternating current port; each direct current bus or each alternating current bus is correspondingly connected with at least one source load device, and a plurality of source load devices are connected to at least one direct current bus or each alternating current bus. The invention realizes the high-proportion access of various distributed renewable energy sources and the multi-stage series-parallel connection of alternating current and direct current power distribution and utilization through the multi-port multifunctional power electronic transformer, and solves the technical problem that the series-parallel connection of the micro-grid in the prior art has certain limitation.
Description
Technical Field
The invention relates to the technical field of micro-grids, in particular to an alternating current-direct current hybrid micro-grid.
Background
Distributed renewable energy sources become an important way for promoting energy transformation at present, distributed energy sources such as wind power, photovoltaic and photo-thermal become development trends of future energy systems, and meanwhile, the proportion of generalized direct-current energy utilization equipment represented by IT loads, variable-frequency air conditioners and electric automobiles is increased rapidly. The problems of multiple alternating current and direct current energy conversion links, high energy conversion loss, poor power distribution and utilization flexibility and low link matching performance in a traditional alternating current distribution network are increasingly highlighted, and the dispersity, randomness and uncontrollable performance of distributed renewable energy access bring challenges to a traditional alternating current system. An alternating current and direct current hybrid micro-grid is urgently needed to be designed, and the distributed power supply, the energy storage and the load are uniformly managed, so that the intermediate links of alternating current and direct current conversion in the power distribution and utilization process are reduced, and the economy, reliability and flexibility of power distribution and utilization are improved.
In the aspect of microgrid structure, a direct current distribution network, new energy and energy storage technologies are integrated into a microgrid for overall research in China. The research on the structure of the alternating-current and direct-current hybrid distributed renewable energy microgrid is not deep, the microgrid is only still in a demonstration engineering application stage, a certain distance is left from commercial application, and the comprehensive energy efficiency, reliability and flexibility of the microgrid need to be further improved.
In the aspect of development of micro-grid key equipment, scholars at home and abroad still start to research power electronic transformers and direct-current circuit breakers in a micro-grid, the power electronic transformers are mainly focused on topological structures and control modes, most of the power electronic transformers are focused on the stages of theoretical research and prototype development, and engineering application is lacked; the direct current circuit breaker mainly researches the medium and high voltage direct current transmission field, and the low voltage distribution field researches a little.
Disclosure of Invention
The invention aims to provide an alternating current-direct current hybrid micro-grid, which aims to realize high-proportion access of various distributed renewable energy sources and multi-stage hybrid connection of alternating current and direct current power distribution and utilization through a multi-port multifunctional power electronic transformer and solve the technical problem that the hybrid connection of the micro-grid in the prior art has certain limitation.
In order to solve the technical problems, the invention specifically provides the following technical scheme:
an alternating current-direct current hybrid micro-grid comprises a power electronic transformer with a plurality of ports, wherein each port is connected with a bus; wherein the content of the first and second substances,
the bus at least comprises a direct current bus and an alternating current bus, the port comprises a direct current port and an alternating current port, the direct current bus is correspondingly connected with the direct current port, and the alternating current bus is correspondingly connected with the alternating current port;
each direct current bus or each alternating current bus is correspondingly connected with at least one source load device, and a plurality of source load devices are connected to at least one direct current bus or each alternating current bus.
As a preferable scheme of the invention, the direct current bus comprises a 10kV direct current bus and a 240V direct current bus;
the alternating-current bus comprises a 10kV alternating-current bus and a 380V alternating-current bus.
As a preferable aspect of the present invention, a voltage parameter of any one of the ports is the same as a voltage parameter of the corresponding bus.
As a preferred scheme of the present invention, the source load device connected to the dc bus at least includes a photovoltaic system and a dc load device;
and the direct current load equipment comprises a charging pile, a direct current air conditioner and IT equipment.
As a preferred scheme of the invention, the source load device connected to the 240V dc bus further comprises a hybrid energy storage system;
the photovoltaic system and the hybrid energy storage system are respectively connected to the direct current bus through a DC/DC voltage converter;
and the direct current load equipment connected to the 10kV direct current bus is connected through a DC/DC voltage converter.
As a preferable aspect of the present invention, a set of DC breakers is connected to each of the DC buses, and each set of DC breakers includes a set of DC/DC voltage converter.
As a preferable aspect of the present invention, a line protection device is provided at each of an outlet of a port of the power electronic transformer connected to the dc bus, a connection with the photovoltaic system, and a connection with the hybrid energy storage system.
As a preferred scheme of the invention, the source load equipment connected to the 380V alternating current bus comprises a photo-thermal system, a fan system and alternating current load equipment;
the ac load device includes a motor and an ac cabinet.
As a preferable scheme of the invention, a 10kV alternating-current bus is connected from a 10kV large power grid, the 10kV large power grid is connected with a corresponding port in the power electronic transformer, and the 10kV alternating-current bus is connected with a direct-current load.
As a preferable scheme of the present invention, the fan is connected to the 380V AC bus through an AC/AC voltage converter.
Compared with the prior art, the invention has the following beneficial effects:
the invention integrates the traditional alternating current, direct current, new energy and energy storage technologies into a system for overall research; the multi-port power electronic transformer can provide alternating current and direct current output at the same time, realizes high-proportion access of various distributed renewable energy sources and multistage series-parallel connection of alternating current and direct current distribution power, and realizes bidirectional free flow of power; compared with the traditional AC-AC conversion and AC-DC conversion, the whole micro-grid passes through a multifunctional power electronic transformer, so that the AC-DC energy conversion link is reduced, and the efficiency of the micro-grid is improved.
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 description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
Fig. 1 is a block diagram of a structure of an ac/dc hybrid microgrid provided in an embodiment of the present invention.
1. A large power grid; 2. a power electronic transformer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Specifically, the alternating-current and direct-current hybrid microgrid based on a power electronic transformer 2 with a four-port structure comprises four voltage levels of 10kV alternating-current voltage (10kV AC), 10kV direct-current voltage (10kV DC), 380V alternating-current voltage (380V AC) and 240V direct-current voltage (240V DC), and the system is mainly provided with 1 power electronic transformer 2 with a four-port structure, 1 set of 240V and 10kV direct-current circuit breakers, wherein each set of direct-current circuit breaker comprises a set of 240V and 10kV direct-current to direct-current voltage converter (DC/DC), various distributed power supplies such as a distributed photovoltaic power supply, a fan and a photo-thermal power generator, various energy storage systems such as energy storage and heat storage, and alternating-current loads and direct-current loads such as a motor, an alternating-current cabinet, a charging pile, a direct-current air conditioner and IT equipment can be accessed according. The main equipment of the system comprises 1 power electronic transformer with four-port structure 2, 1 set of 240V fault current controller and 1 set of 10kV fault current controller.
The system adopts a single-circuit 10kV large power grid 1 line incoming line which is connected to a power electronic transformer 2AC 10kV port, an AC 10kV side is an incoming line of a main power supply source of a power grid, a DC 10kV side adopts single bus wiring and can be connected with a photovoltaic and direct current load which are distributed far away, a DC 240V side adopts single bus wiring and is connected with the photovoltaic, mixed energy storage and direct current load, and meanwhile, a set of 0.5mH reactor device is connected in series with the port bus side to limit short-circuit current; and the AC 380V side adopts single bus connection and is connected with a wind driven generator, a photo-thermal generator and an alternating current load. And line protection devices are arranged at positions such as the outlet of the transformer, the outlet of the photovoltaic inverter and the outlet of the battery energy storage, so that the equipment cannot be damaged when a fault occurs. Industrial loads such as an alternating current cabinet, a motor and the like are supplied with power by an alternating current bus, direct current loads such as a direct current air conditioner, IT equipment and a charging pile are supplied with power by a direct current bus, a nearby photovoltaic system and a nearby battery energy storage system are directly connected into a 240V direct current bus through a direct current to direct current voltage converter (DC/DC), a distant photovoltaic system and a far direct current load are connected into a 10kV direct current bus, and a 10kV alternating current high-voltage power supply is connected into a 10kV large power grid 1 nearby.
The capacity of the ports of the power electronic transformer 2 can be configured according to actual requirements, a bidirectional four-port arrangement is adopted, wherein the 10kV AC side is the power inlet wire of the large power grid 1, and each port of the power electronic transformer 2 has overload capacity of 1.1 times. The multifunctional power electronic transformer 2, a key device of the micro-grid, has the following characteristics: 1) and has multiple ports. The power supply comprises four ports of 10kV alternating current, 10kV direct current, 380V alternating current and 240V direct current, and source charge access of multiple voltage levels can be realized; 2) multiple cascades. By adopting a cascade modular design, the modules can be increased and decreased according to actual requirements, and the expansion and operation maintenance are convenient; 3) and (4) multi-flow direction. Each port can realize power bidirectional flow, and any two ports can realize energy circulation to realize power mutual aid; 4) is polymorphic. The alternating current port can change the waveform form, has the functions of harmonic suppression and reactive compensation, and improves the electric energy quality level of a power grid, and obviously improves the efficiency of the whole machine and the flexible networking capability. 5) The capacity of the transformer can be configured according to actual requirements from 1MW to 3MW, each port is independent, and the capacity can also be configured according to actual requirements. Each port of the transformer has overload capacity of 1.1 times, and the power module can be reasonably put into the transformer through related control measures according to the load change condition so as to achieve optimal energy efficiency, which is a function that the traditional alternating current transformer of a distribution network does not have.
And line protection devices are arranged at the outlet of the transformer, the outlet of the photovoltaic inverter and the outlet of the battery energy storage to ensure that equipment cannot be damaged when a fault occurs. The power electronic transformer 2 and the direct current circuit breaker are both provided with body protection, various abnormal working conditions influencing the safety of body equipment can be quickly isolated (cut off), the protection configured by the power distribution system is only considered as backup protection, each protection range is overlapped without protection dead zones, and the protection area can be divided into: the system comprises an alternating current side system protection subarea, a direct current system protection subarea and a power electronic protection subarea.
The micro-grid is simple in structure and low in manufacturing cost, but when a transformer fails or is overhauled, the load needs to be completely powered off. Compared with the traditional AC-DC distribution power distributed converter, the converter of the multi-port power electronic transformer 2 adopts a high-power centralized module, so that the AC-DC conversion link and the quantity of power distribution and utilization are reduced, the efficiency of the high-power centralized module is higher than that of the distributed low-power converter, the efficiency of the AC-DC distribution power microgrid is improved, the converter power module in the multi-port power electronic transformer 2 can be reused, and the reliability of the multi-port power electronic transformer 2 is improved on the premise of not increasing the cost.
And meanwhile, the photovoltaic system can transmit power to the large power grid 1 through a transformer, so that the free distribution of the power is realized. According to the distributed energy and load change conditions, the converter power modules at all ports are reasonably put into use through power control measures of the power electronic transformer 2, the power of all ports of the power electronic transformer 2 can be effectively adjusted, and further the operation states of the load factor and the like of the power electronic transformer 2 are influenced, so that the power electronic transformer 2 is in the optimal working condition operation state, the operation efficiency of the transformer is improved, the optimal energy efficiency operation of the transformer is achieved, and the function which is not possessed by the traditional alternating current transformer is achieved. Meanwhile, compared with the traditional AC/DC distribution type converter, the converter of the multifunctional power electronic transformer 2 adopts a high-power centralized module, so that the AC/DC conversion link and the quantity of power distribution and utilization are reduced, the efficiency of the high-power centralized module is higher than that of the distributed low-power converter, the efficiency of an AC/DC power distribution system is improved, the converter power module in the multi-port power electronic transformer 2 can be reused, and the reliability of the multi-port power electronic transformer 2 is improved on the premise of not increasing the cost.
In a specific embodiment, as shown in fig. 1, the invention is an ac/dc hybrid microgrid based on a power electronic transformer 2 with a four-port structure, comprising 1 power electronic transformer 2 with a four-port structure, 1 set of 240V fault current controller, 1 set of 10kV fault current controller, a photovoltaic access unit, a photo-thermal collector, a photo-thermal generator, a fan, a hybrid energy storage unit, a rectifier and inverter, a cable line, a line protection device, various ac/dc loads, and the like, and the specific implementation process is as follows:
(1) the microgrid contains four voltage levels: alternating current 10kV, alternating current 380V, direct current 10kV and direct current 240V, and the multi-stage series-parallel connection of multiple distributed renewable energy sources with high proportion access and alternating current and direct current distribution power is realized.
(2) The power electronic transformer 2 with the four-port structure is used as an energy router of a micro-grid and has the characteristics of multiple ports, multiple cascades, multiple flow directions, multiple forms and configurable capacity.
(3) The solar photovoltaic system and the hybrid energy storage system nearby are connected into a 240V direct current bus through a DC/DC rectifier to be used by a load, the solar photovoltaic system at a distance is connected into a 10kV direct current bus through the DC/DC rectifier, the solar photovoltaic system can be used as a standby power supply to supply power to the load when the input voltage of a large power grid 1 is interrupted, power failure accidents are reduced to the maximum extent, meanwhile, electric energy generated by photovoltaic can be transmitted into the large power grid 1 through a power electronic transformer 2 when the power consumption is low, and the two-way transmission of power is realized. Meanwhile, the distributed energy can be used for load power regulation control of the power electronic transformer 2, and when the load demand is small, the distributed energy can be used for power supply, so that the distributed energy can be completely consumed on the spot as far as possible, and the improvement of the economy is facilitated.
(4) Industrial loads such as an alternating current cabinet and a motor are supplied with power by an alternating current 380V bus, and renewable energy sources such as distributed photo-thermal energy, a fan and the like are connected to the alternating current 380V bus.
(5) The 10kV direct current bus can be changed into a corresponding voltage class through the DC/DC conversion device to be used by a remote industrial direct current load.
(6) And the 240V direct current bus is connected into direct current loads such as IT equipment, a direct current air conditioner and a charging pile.
(7) All connecting lines are connected by cables, so that the reliability is enhanced and the occupied area is reduced.
(8) And reasonably configuring the direct current breaker and the protection device to realize stable and efficient operation of the system.
(9) According to the distributed energy and load change conditions, the converter power modules at all ports are reasonably put into use through power control measures of the power electronic transformer 2, the power of all ports of the power electronic transformer 2 can be effectively adjusted, and further the operation states of the power electronic transformer 2, such as the load factor and the like, are influenced, so that the power electronic transformer 2 is in the optimal working condition operation state, the operation efficiency of the transformer is improved, and the optimal energy efficiency operation of the transformer is achieved.
(10) The converter of the power electronic transformer 2 adopts a high-power centralized module.
(11) The power electronic transformer 2 and the direct current circuit breaker are both provided with body protection, various abnormal working conditions influencing the safety of body equipment can be quickly isolated (cut off), the protection configured by the power distribution system is only considered as backup protection, each protection range is overlapped without protection dead zones, and the protection area can be divided into: the system comprises an alternating current side system protection subarea, a direct current system protection subarea and a power electronic protection subarea.
The invention discloses an alternating current-direct current hybrid micro-grid of a power electronic transformer 2 based on a four-port structure, which is a novel micro-grid provided under the condition of facing new energy in the future, and the micro-grid can realize the cooperative coordination of a large grid 1 and distributed energy and the bidirectional flow of power, is convenient for the optimized operation and control of the grid, and avoids the interference of the traditional distributed energy to a main grid when the traditional distributed energy is connected into the large grid 1. Meanwhile, different voltage types are adopted for supplying power for different load requirements, so that the energy transmission efficiency is greatly enhanced, and the energy loss is reduced.
The above embodiments are only exemplary embodiments of the present application, and are not intended to limit the present application, and the protection scope of the present application is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present application and such modifications and equivalents should also be considered to be within the scope of the present application.
Claims (10)
1. The alternating current-direct current hybrid micro-grid is characterized by comprising a power electronic transformer with a plurality of ports, wherein each port is connected with a bus; wherein the content of the first and second substances,
the bus at least comprises a direct current bus and an alternating current bus, the port comprises a direct current port and an alternating current port, the direct current bus is correspondingly connected with the direct current port, and the alternating current bus is correspondingly connected with the alternating current port;
each direct current bus or each alternating current bus is correspondingly connected with at least one source load device, and a plurality of source load devices are connected to at least one direct current bus or each alternating current bus.
2. The AC-DC hybrid microgrid of claim 1, wherein the DC buses comprise a 10kV DC bus and a 240V DC bus;
the alternating-current bus comprises a 10kV alternating-current bus and a 380V alternating-current bus.
3. The AC/DC hybrid microgrid of claim 2, wherein a voltage parameter of any one of said ports is the same as a voltage parameter of the corresponding bus bar.
4. The AC-DC hybrid microgrid according to claim 2 or 3, characterized in that source load equipment connected to a DC bus at least comprises a photovoltaic system and DC load equipment;
and the direct current load equipment comprises a charging pile, a direct current air conditioner and IT equipment.
5. The AC-DC hybrid microgrid of claim 4, wherein source charging equipment connected to a 240V DC bus further comprises a hybrid energy storage system;
the photovoltaic system and the hybrid energy storage system are respectively connected to the direct current bus through a DC/DC voltage converter;
and the direct current load equipment connected to the 10kV direct current bus is connected through a DC/DC voltage converter.
6. The AC-DC hybrid microgrid according to claim 5, wherein a set of DC breakers are connected to each DC bus, and each set of DC breakers comprises a set of DC/DC voltage converters.
7. The AC/DC hybrid microgrid of claim 6, wherein line protection devices are respectively arranged at an outlet of a port of the power electronic transformer connected with the DC bus, a connection with the photovoltaic system and a connection with the hybrid energy storage system.
8. The AC-DC hybrid microgrid of claim 2 or claim 3, wherein source load equipment connected to a 380V AC bus comprises a photo-thermal system, a fan system and AC load equipment;
the ac load device includes a motor and an ac cabinet.
9. The AC/DC hybrid microgrid of claim 2 or 3, wherein a 10kV AC bus is connected from a 10kV large power grid, the 10kV large power grid is connected with a corresponding port in the power electronic transformer, and a DC load is connected to the 10kV AC bus.
10. The AC-DC hybrid microgrid of claim 8, wherein the fan is connected to the 380V AC bus through an AC/AC voltage converter.
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| CN115473228A (en) * | 2022-11-14 | 2022-12-13 | 国网上海能源互联网研究院有限公司 | Heterogeneous multi-port alternating current and direct current power electronic networking device |
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