CN112865112B - Energy storage type shore power system for port - Google Patents
Energy storage type shore power system for port Download PDFInfo
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- CN112865112B CN112865112B CN202110293061.1A CN202110293061A CN112865112B CN 112865112 B CN112865112 B CN 112865112B CN 202110293061 A CN202110293061 A CN 202110293061A CN 112865112 B CN112865112 B CN 112865112B
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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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
- H02J3/28—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
- H02J3/322—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to the technical field of port shore power, in particular to a port energy storage type shore power system, which comprises: the shore power bidirectional converter comprises a rectifier module and an inverter module, wherein the input end of the rectifier module is connected with the alternating current bus through a first transformer; the direct current bus is connected with the output end of the rectifier module, and the input end of the inverter module is connected with the direct current bus; the shore power socket box is connected with the output end of the inverter module through a second transformer; the energy storage system is connected with the direct current bus; an EMS management system is connected to each of the energy storage system, the rectifier module, and the inverter module. According to the shore power supply system, the input and output units, the bus and the control unit are shared by the energy storage system and the shore power, so that the investment of the energy storage system can be obviously reduced, the utilization rate of the energy storage system is improved, and the shore power system can reduce the power price through the peak-valley power price difference to solve the problem of low utilization rate of shore power facilities.
Description
Technical Field
The invention relates to the technical field of port shore power, in particular to a port energy storage type shore power system.
Background
In the world, trade among countries is very frequent, and marine transportation mainly using ships has become the most important transportation means for the trade among countries in the world. But at the same time, the marine transportation also derives serious environmental pollution problems. With the increasing demand of governments and people around the world for protecting and improving the environment, more and more attention has been paid to solving the pollution problem during the port-docking of ships. The method has the advantages that normal operation of ships during port berthing is guaranteed, huge pollution caused by ship power generation is reduced in a large area, a concrete and effective solution is found to be more important, and the ship shore power technology is developed on the background. The technology is mainly characterized in that system related equipment is arranged on a ship and is connected into a power supply when the ship is in shore so as to supply power to the ship.
With the progress of land electricity construction in various regions, the phenomenon that the access rate is low after the current land electricity construction is finished is common, the main reason is that the use cost of the land electricity is far higher than the cost of oil burning power generation of auxiliary machines of a ship, through corresponding calculation, if the ship does not adopt a land electricity system for power supply, a diesel engine set is still adopted for power generation, the power generation cost is 0.7 yuan/(kwh), if the ship adopts the land electricity system, the port supplies power to the ship, the cost consumed by a ship enterprise is 1.0 yuan/(kwh), and the cost is high, so that the power receiving price and the power supply price are inversely hung. The power receiving price and the power supply price are inversely hung, the power receiving willingness of both sides of the shore ship is seriously influenced, shore power facilities gradually evolve into silent assets of all ports and wharf sides after being built, and certain difference exists between the shore power facilities and relevant measurement and calculation in the initial construction stage. Therefore, the system can not be attracted to ship companies to apply, so that the economic benefit of using shore power by port parties and ship parties can not be reflected, the popularization difficulty of the shore power is further increased, and most of the constructed port shore power is in an idle state.
In order to better solve the problem of low utilization rate of shore power facilities and improve the income of investors, the access of new energy power generation can be considered, and an energy storage device is utilized to carry out peak clipping and valley filling to reduce the power price.
Disclosure of Invention
The present invention is based on the discovery and recognition by the inventors of the following facts and problems:
energy storage system and bank electricity among the correlation technique use converter and input/output equipment power supply to ship side equipment separately, have the energy memory investment great, the problem that the utilization ratio is low, and then lead to the bank electric system can not fully reduce the price of electricity through peak valley price difference, the problem that bank electricity facility utilization ratio is low.
The present invention is directed to solving, at least in part, one of the technical problems in the related art.
To this end, an embodiment of the present invention provides a harbour energy storage type shore power system, including: an alternating current bus, a shore power bidirectional converter, a direct current bus, a shore power socket box, an energy storage system and an EMS management system,
the shore power bidirectional converter comprises a rectifier module and an inverter module, wherein the input end of the rectifier module is connected with the alternating current bus through a first transformer;
the direct current bus is connected with the output end of the rectifier module, and the input end of the inverter module is connected with the direct current bus;
the shore power socket box is connected with the output end of the inverter module through a second transformer;
wherein the energy storage system is connected with the direct current bus;
wherein the EMS management system is connected with each of the energy storage system, the rectifier module, and the inverter module.
According to the port energy storage type shore power system provided by the embodiment of the invention, the energy storage system and the shore power share the input and output units, the bus and the control unit, and the energy storage system and the shore power can also share the box body, the auxiliary equipment and the like when being additionally arranged, so that the investment of the energy storage system can be obviously reduced, the utilization rate of the energy storage system can be improved, the energy storage system can utilize the peak-valley price difference for arbitrage, the power price and the operation cost of a shore-based power supply facility even the whole port can be reduced, and the problem of low utilization rate of the shore power facility can be solved by the shore power system through the peak-valley price difference and the power price reduction, so that the shore power investment income is improved, and the development of intelligent power supply of port ships is promoted.
In some embodiments, the port energy storage type shore power system further includes a new energy power generation access interface, the new energy power generation access interface is connected to the output end of the inverter module through the second transformer, and the new energy power generation access interface is connected to the EMS management system.
In some embodiments, the new energy generation access interface is connected to a wind power generation system, a photovoltaic power generation system, a tidal power generation system, and a distributed gas power generation system.
In some embodiments, the port energy storage type shore power system further comprises a direct current charging pile, an alternating current charging pile and an office power interface;
the direct current charging pile is connected to the input end of the inverter module;
the alternating current charging pile and the office electricity utilization interface are connected to the output end of the inverter module through the second transformer;
wherein each of the direct current charging post, the alternating current charging post and the office electricity interface is connected with the EMS management system.
In some embodiments, the harbour energy storage shore power system further comprises a common dc charging station connected to the dc bus, the common dc charging station being connected to the EMS management system.
In some embodiments, the shore power bidirectional converter comprises a plurality of the rectifier modules and a plurality of the inverter modules.
In some embodiments, the rectifier module is connected to the first transformer through a switch, and the inverter module is connected to the second transformer through a switch.
In some embodiments, the rectifier module and the inverter module are both fully controlled devices.
In some embodiments, the energy storage system comprises an energy storage type lithium battery system and/or a power battery system.
In some embodiments, the EMS management system includes an EMS server and a control network.
Drawings
Fig. 1 is a schematic view of a port energy storage type shore power system according to an embodiment of the present invention.
Reference numerals: the system comprises an energy storage system 1, a shore power bidirectional converter 2, a rectifier module 21, an inverter module 22, an alternating current and direct current microgrid system 3, a direct current charging pile 31, an alternating current charging pile 32, an office power interface 33, a new energy power generation access interface 34, a first transformer 4, a common direct current charging station 5, an EMS management system 6, a shore power receptacle box 7, a second transformer 8, a photovoltaic power generation system 9, a wind power generation system 10, a tidal power generation system 11, a distributed gas power generation system 12, an alternating current bus 13 and a direct current bus 14.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Referring to fig. 1, an embodiment of the present invention provides a port energy storage type shore power system, including: the system comprises an alternating current bus 13, a shore power bidirectional converter 2, a direct current bus 14, a shore power socket box 7, an energy storage system 1 and an EMS management system 6, wherein the EMS management system 6 is an energy management system.
The shore power bidirectional converter 2 comprises a rectifier module 21 and an inverter module 22, the input of the rectifier module 21 being connected to the ac busbar 13 via the first transformer 4.
The dc bus 14 is connected to the output of the rectifier module 21, and the input of the inverter module 22 is connected to the dc bus 14.
The shore power box 7 is connected to the output of the inverter module 22 via a second transformer 8.
The energy storage system 1 is connected to a dc bus 14.
The EMS management system 6 is connected to each of the energy storage system 1, the rectifier module 21, and the inverter module 22.
According to the port energy storage type shore power system provided by the embodiment of the invention, the energy storage system and the shore power share the shore power bidirectional converter, the direct current bus, the first transformer, the second transformer, the shore power socket box and the EMS management system, which are equivalent to the energy storage system and the shore power share the input, output, bus and control unit, and the energy storage system and the shore power can share the box body, the auxiliary equipment and the like when being additionally arranged, so that the investment of the energy storage system can be obviously reduced, the utilization rate of the energy storage system is improved, the energy storage system can utilize the peak-valley power price difference to realize arbitrage, the power price and the shore-based power supply facility, even the running cost of the whole port can be reduced, the problem of low utilization rate of the shore power facility can be solved by the peak-valley power price difference and the reduction of the power price of the shore power system, the port shore power investment income is improved, and the development of intelligent power supply of ships is promoted.
The energy storage system is used as power supply equipment, short-time static capacity expansion can be provided for the powered equipment, the cost of transformer transformation is saved, and the cost is reduced.
In addition, the port energy storage type shore power system can also solve the problem of reverse power, and when the shore power system and a ship side power supply are in grid-connected operation, the reverse power from the ship side can be directly stored in the energy storage system without being specially processed as harmful energy.
In some embodiments, the harbour energy storage type shore power system further comprises a new energy power generation access interface 34, the new energy power generation access interface 34 is connected to the output end of the inverter module 22 through the second transformer 8, and the new energy power generation access interface 34 is connected to the EMS management system 6.
The new energy power generation access interface 34 is connected with the wind power generation system 10, the photovoltaic power generation system 9, the tidal power generation system 11, the distributed gas power generation system 12 and the like, and meanwhile, the wind power generation system 10, the photovoltaic power generation system 9, the tidal power generation system 11 and the distributed gas power generation system 12 can also be additionally provided with access interfaces directly connected with an alternating current bus.
According to the harbour energy storage type shore power system of this embodiment, new forms of energy electricity generation access interface lug connection is at the output of dc-to-ac converter module, and it is off-grid type to be equivalent to the new forms of energy electricity generation access, convenient control, and stability is better, has avoided the power fluctuation to the impact that the electric wire netting caused, realizes the high reliable supply to the shore power system of loading multiple energy form, realizes active distribution network, makes traditional electric wire netting transition to smart power grids.
In some embodiments, the harbour energy storage shore power system further comprises a dc charging pile 31, an ac charging pile 32 and an office electricity interface 33.
The direct current charging pile 31 is connected to the input end of the inverter module 22; the alternating current charging pile 32 and the office electricity utilization interface 33 are connected to the output end of the inverter module 22 through a second transformer; each of the dc charging post 31, the ac charging post 32, and the office electrical interface 33 is connected to the EMS management system 6.
According to harbour energy storage type bank power system of this embodiment, harbour energy storage type bank power system make full use of energy storage system and become alternating current-direct current microgrid system 3 with new forms of energy electricity generation access interface, direct current fill electric pile, alternating current fill electric pile and office power interface with bank power system construction.
In some embodiments, the harbour energy storage type shore power system further includes a common DC charging station 5, the common DC charging station may be an AC charging station or a DC charging station, the common DC charging station 5 may use a common DC system that is a DC output (using a DC-DC module) or an AC output (using a DC-AC module, i.e., an inverter module), the common DC charging station 5 is connected to the DC bus 14, and the common DC charging station 5 is connected to the EMS management system 6.
According to harbour energy storage type bank electric system of this embodiment, the usable newly-built lithium cell energy storage system of dc charging station altogether or ladder battery energy storage system (power battery echelon utilization) expand into the mixed charging station of wind, light, storage, the integrative combination of charging, can change the forward edge facility of pier (like power consumption load such as air conditioner, new trend fan, illumination) into the direct current power supply mode, more facilitates the use.
In some embodiments, the shore power bidirectional converter 2 comprises a plurality of rectifier modules 21 and a plurality of inverter modules 22.
According to the harbour energy storage type bank electricity system of this embodiment, when energy storage system supplied power for bank electricity socket box, there was many inverters reserve, compares in being equipped with bidirectional converter alone for energy storage system, can guarantee the power supply reliability.
In some embodiments, the rectifier module 21 is connected to the first transformer 4 by a switch, and the inverter module 22 is connected to the second transformer 8 by a switch.
In some embodiments, the rectifier module 21 and the inverter module 22 are all fully controlled devices.
According to the port energy storage type shore power system of the embodiment, the rectifier module and the inverter module are conveniently controlled through the EMS management system.
In some embodiments, the energy storage system 1 comprises an energy storage type lithium battery system and/or a power battery system.
According to the harbour energy storage type shore power system of this embodiment, energy storage system sets up to energy storage battery system, and energy storage battery system can configure to brand-new energy storage type lithium cell system, also can adopt new forms of energy electric motor car, electronic collection card trailer retires power battery system.
In some embodiments, the EMS management system 6 includes an EMS server and a control network, which may be wired or wireless.
In some specific examples, referring to fig. 1, a port energy storage type shore power system includes: the system comprises an alternating current bus 13, a shore power bidirectional converter 2, a direct current bus 14, a shore power socket box 7, an energy storage system 1 and an EMS management system 6, wherein the alternating current bus 13 is a 10KV/50HZ alternating current bus.
The shore power bidirectional converter 2 is a four-quadrant converter, serves as a shore power frequency conversion system and can achieve bidirectional flow of power, the shore power bidirectional converter 2 comprises a rectifier module 21 and an inverter module 22, and the input end of the rectifier module 21 is connected with the alternating current bus 13 through a first transformer 4.
The dc bus 14 is connected to the output of the rectifier module 21, and the input of the inverter module 22 is connected to the dc bus 14.
Wherein the shore power box 7 is connected to the output of the inverter module 22 via a second transformer 8.
Wherein the energy storage system 1 is connected to a dc bus 14.
The port energy storage type shore power system further comprises a new energy power generation access interface 34, the new energy power generation access interface 34 is connected to the output end of the inverter module 22 through the second transformer 8, and the new energy power generation access interface 34 is connected with the wind power generation system 10, the photovoltaic power generation system 9, the tidal power generation system 11 and the distributed gas power generation system 12.
The port energy storage type shore power system further comprises a direct current charging pile 31, an alternating current charging pile 32 and an office power utilization interface 33.
The direct current charging pile 31 is connected to the input end of the inverter module 22; the ac charging post 32 and the office electrical interface 33 are connected to the output of the inverter module 22 via the second transformer 8.
The harbour energy storage type shore power system further comprises a common direct current charging station 5, the common direct current charging station can be an alternating current charging station or a direct current charging station, and the common direct current charging station 5 is connected to the direct current bus 14.
The number of rectifier modules 21 and the number of inverter modules 22 are determined according to the required capacity which is an actual project.
The rectifier module 21 is connected with the first transformer 4 through a switch; the inverter module 22 is connected to the second transformer 8 via a switch.
The rectifier module 21 and the inverter module 22 are all fully controlled devices.
Each of the energy storage system 1, the shore power bidirectional converter 2, the new energy power generation access interface 34, the direct current charging pile 31, the alternating current charging pile 32, the office power utilization interface 33 and the common direct current charging station 5 is connected with the EMS management system 6, the EMS management system 6 comprises an EMS server and a control network, and the EMS management system manages all modules of the shore power system through the EMS server.
The energy storage system in the harbour energy storage type shore power system of this embodiment can utilize peak-valley electricity price difference to carry out arbitrage, charges to energy storage system at valley price electricity charge period through the EMS server, and during peak value electricity charge period or the power failure during boats and ships are leaned on the shore, utilizes the EMS server to make energy storage system provide power supply to shore power socket case, and has many inverters for subsequent use, can guarantee the reliability of power supply.
Meanwhile, in a peak electricity charge period or during power failure during the ship landing period, the energy storage system can supply power to the AC/DC micro-grid system 3 (a new energy power generation access interface, a DC charging pile, an AC charging pile and an office power utilization interface) and a common DC charging station by using the EMS server, so that the power utilization cost of the whole port can be reduced, and the shore power utilization rate is improved.
The new energy power generation access interface in the embodiment is connected with wind power generation, photovoltaic power generation, tidal power generation or small-sized distributed gas power generation, the new energy power generation access interface can provide power supply for the shore electric socket box, the new energy power generation access interface can also supply power to the energy storage system through the EMS server after generating extra power, redundant electric quantity is stored, meanwhile, power can be provided for the direct current charging pile, the alternating current charging pile and the office power utilization interface, and the consumption capacity of new energy is improved.
The port energy storage type shore power system in the embodiment utilizes the energy storage system to expand into a hybrid charging station integrating wind, light, storage and charging, promotes the large-scale access of a distributed power supply and renewable energy, realizes the highly reliable supply of the shore power system loaded with various energy forms, reduces the power consumption cost, realizes green production, realizes an active power distribution network, and makes the traditional power grid transition to an intelligent power grid.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. A port energy storage type shore power system, comprising:
an alternating current bus;
the shore power bidirectional converter comprises a rectifier module and an inverter module, and the input end of the rectifier module is connected with the alternating current bus through a first transformer;
the direct current bus is connected with the output end of the rectifier module, and the input end of the inverter module is connected with the direct current bus;
the shore power socket box is connected with the output end of the inverter module through a second transformer, and when the energy storage system supplies power to the shore power socket box, a plurality of inverters are reserved;
the energy storage system is connected with the direct current bus, and the energy storage system and shore power share a shore power bidirectional converter, the direct current bus, a first transformer, a second transformer, a shore power receptacle box and an EMS management system; and
an EMS management system connected to each of the energy storage system, the rectifier module, and the inverter module;
the rectifier module is connected with the first transformer through a switch, and the inverter module is connected with the second transformer through a switch;
the shore power bidirectional converter comprises a plurality of the rectifier modules and a plurality of the inverter modules.
2. The harbour energy storage type shore power system according to claim 1, further comprising a new energy power generation access interface, wherein the new energy power generation access interface is connected to an output end of the inverter module through the second transformer, and wherein the new energy power generation access interface is connected to the EMS management system.
3. The port energy storage shore power system according to claim 2, wherein said new energy generation access interface is connected to a wind power generation system, a photovoltaic power generation system, a tidal power generation system and a distributed gas power generation system.
4. The harbour energy storage shore power system according to claim 1, further comprising dc charging piles, ac charging piles and an office power interface; wherein
The direct current charging pile is connected to the input end of the inverter module;
the alternating current charging pile and the office electricity utilization interface are connected to the output end of the inverter module through the second transformer;
each of the direct current charging pile, the alternating current charging pile and the office power interface is connected with the EMS management system.
5. The harbour energy storage shore power system according to claim 1, further comprising a common dc charging station connected to said dc bus, said common dc charging station being connected to said EMS management system.
6. The port energy storage shore power system of claim 1, wherein said rectifier module and said inverter module are all fully controlled devices.
7. The port energy storage shore power system according to claim 1, characterized in that said energy storage system comprises an energy storage lithium battery system and/or a power battery system.
8. Harbour energy storage shore power system according to any of the claims 1-7, characterised in that said EMS management system comprises an EMS server and a control network.
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| CN205104913U (en) * | 2015-11-18 | 2016-03-23 | 中航锂电（洛阳）有限公司 | Flexible energy storage charging system |
| FI3619787T3 (en) * | 2017-05-05 | 2024-03-25 | Siemens Energy AS | Electric charging system and method |
| CN208369215U (en) * | 2018-04-19 | 2019-01-11 | 上海充加新能源科技有限公司 | A kind of harbour bank electricity system |
| CN211320939U (en) * | 2019-12-31 | 2020-08-21 | 浙江浙能技术研究院有限公司 | Low-voltage shore power system comprising wind-solar energy storage unit |
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