CN217824284U - Cascade type energy storage system, light storage system, wind storage system and wind and light storage system - Google Patents

Cascade type energy storage system, light storage system, wind storage system and wind and light storage system Download PDF

Info

Publication number
CN217824284U
CN217824284U CN202221254175.1U CN202221254175U CN217824284U CN 217824284 U CN217824284 U CN 217824284U CN 202221254175 U CN202221254175 U CN 202221254175U CN 217824284 U CN217824284 U CN 217824284U
Authority
CN
China
Prior art keywords
converter
storage system
cascade
direct current
energy storage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202221254175.1U
Other languages
Chinese (zh)
Inventor
杨春源
梁信信
谢方南
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sungrow Power Supply Co Ltd
Original Assignee
Sungrow Power Supply Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sungrow Power Supply Co Ltd filed Critical Sungrow Power Supply Co Ltd
Priority to CN202221254175.1U priority Critical patent/CN217824284U/en
Application granted granted Critical
Publication of CN217824284U publication Critical patent/CN217824284U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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

Landscapes

  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The application provides a cascade energy storage system, a light storage system, a wind storage system and a wind and light storage system, wherein corresponding DC/DC converters connected with battery modules of each phase in the cascade energy storage system are sequentially connected in series between a positive electrode and a negative electrode of a cascade direct-current bus; the alternating current side of the cascade direct current bus is connected in parallel with each DC/AC conversion unit of the alternating current power grid, and the direct current side of the cascade direct current bus is also sequentially connected in series between the positive pole and the negative pole of the cascade direct current bus; and then utilize the cascade of power electronics conversion equipment, realized the promotion of direct current side voltage, constructed high voltage direct current energy storage system, improved energy storage system's conversion efficiency and power density.

Description

Cascade type energy storage system, light storage system, wind storage system and wind and light storage system
Technical Field
The application relates to the technical field of power electronic conversion, in particular to a cascade energy storage system, a light storage system, a wind storage system and a wind-light storage system.
Background
The power system taking new energy as a main body can thoroughly change the power production mode of 'source follow-up load' in the traditional power grid. The energy storage system can improve the output planning and the schedulability of the power grid side and the new energy source side, and plays an increasingly important role in ensuring the stability and the safety of the power system.
As shown in fig. 1a, a general energy storage system mainly includes a battery system, which is connected to a power grid and power-coupled to the power grid through an energy storage converter and a transformer; in the prior art, when the required energy storage capacity increases, the energy storage can only be realized by connecting more energy storage inverter units (including a battery system and an energy storage converter) in parallel, as shown in fig. 1b, so that the conversion efficiency and the power density of the energy storage system have bottlenecks.
SUMMERY OF THE UTILITY MODEL
In view of this, the present application provides a cascaded energy storage system, an optical energy storage system, a wind energy storage system, and a wind and light energy storage system to improve the conversion efficiency and power density of the energy storage system.
In order to achieve the above purpose, the present application provides the following technical solutions:
the present application provides in a first aspect a cascaded energy storage system, comprising: at least two DC/AC conversion units, and, at least two battery modules and their DC/DC converters; wherein,
the alternating current side of each DC/AC conversion unit is respectively connected with an alternating current power grid;
the direct current sides of the DC/AC conversion units are sequentially connected in series between the positive electrode and the negative electrode of the cascade direct current bus;
each battery module is connected with one side of the corresponding DC/DC converter;
and the other side of each DC/DC converter is sequentially connected in series between the anode and the cathode of the cascade direct current bus.
Optionally, the method further includes: and the direct current interfaces are led out from the positive electrode and the negative electrode of the cascade direct current bus to be connected with a direct current power grid and/or a direct current load.
Optionally, each of the DC/DC converters is: a Boost circuit;
the low-voltage side of each Boost circuit is respectively connected with the corresponding battery module;
and the high-voltage side of each Boost circuit is sequentially connected in series between the positive electrode and the negative electrode of the cascade direct-current bus.
Optionally, each DC/AC conversion unit includes: DC/AC converter and transformer;
the direct current side of each DC/AC converter is sequentially connected in series between the positive electrode and the negative electrode of the cascade direct current bus;
and the alternating current side of each DC/AC converter is connected with the alternating current power grid through the corresponding transformer.
Optionally, each DC/AC conversion unit includes: a DC/AC converter;
the direct current side of each DC/AC converter is sequentially connected in series between the anode and the cathode of the cascade direct current bus;
and the alternating current side of each DC/AC converter is connected with the alternating current power grid through the same transformer.
Optionally, the DC/AC converter is: a three-phase full bridge inverter.
Optionally, the battery module includes: one battery cluster, or, at least two battery clusters connected in parallel;
the battery cluster comprises: one battery pack, or at least two battery packs connected in series.
Optionally, the AC side of each DC/AC conversion unit is further connected to an AC load.
A second aspect of the present application provides a light storage system comprising: a photovoltaic system, and a cascaded energy storage system as described in any of the above first aspects;
the photovoltaic system is connected between the positive electrode and the negative electrode of the cascade direct-current bus of the cascade energy storage system.
Optionally, the photovoltaic system comprises: a photovoltaic array and at least one photovoltaic DC/DC converter;
the low-voltage side of each photovoltaic DC/DC converter is respectively connected with a corresponding photovoltaic group string in the photovoltaic array;
and the high-voltage side of each photovoltaic DC/DC converter is sequentially connected in series between the positive electrode and the negative electrode of the cascade direct-current bus.
A third aspect of the present application provides a wind storage system, comprising: a wind power generation system, and a cascaded energy storage system as described in any of the above first aspects;
the wind power generation system is connected with an alternating current power grid, or each direct current side of the wind power generation system is connected between the positive electrode and the negative electrode of the cascade direct current bus of the cascade energy storage system in a cascade mode.
Optionally, the wind power generation system includes: at least one wind turbine and its corresponding wind power converter; the wind power generation units are respectively connected with the alternating current side of a machine side converter in the wind power converter, the direct current side of the machine side converter is connected with the direct current side of a grid side converter in the wind power converter, and the alternating current side of the grid side converter is connected with an alternating current power grid;
alternatively, the wind power generation system comprises: at least one wind turbine and its corresponding AC/DC converter; the wind generation sets are respectively connected with the alternating current sides of the corresponding AC/DC converters, and the direct current sides of the AC/DC converters are sequentially connected in series between the positive electrode and the negative electrode of the cascade direct current bus.
The present application provides in a fourth aspect a wind-solar energy storage system, comprising: a photovoltaic system, a wind power generation system, and a cascaded energy storage system as described in any of the above first aspects;
the photovoltaic system is connected between the positive electrode and the negative electrode of the cascade direct-current bus of the cascade energy storage system;
the wind power generation system is connected with an alternating current power grid, or each direct current side of the wind power generation system is connected between the positive electrode and the negative electrode of the cascade direct current bus in a cascade mode.
Optionally, the photovoltaic system comprises: a photovoltaic array and at least one photovoltaic DC/DC converter;
the low-voltage side of each photovoltaic DC/DC converter is respectively connected with a corresponding photovoltaic group string in the photovoltaic array;
and the high-voltage side of each photovoltaic DC/DC converter is sequentially connected in series between the positive electrode and the negative electrode of the cascade direct-current bus.
Optionally, the wind power generation system includes: at least one wind turbine and its corresponding wind power converter; the wind power generation sets are respectively connected with the alternating current side of a generator side converter in the corresponding wind power converter, the direct current side of the generator side converter is connected with the direct current side of a grid side converter in the wind power converter, and the alternating current side of the grid side converter is connected with an alternating current power grid;
alternatively, the wind power generation system comprises: at least one wind turbine and its corresponding AC/DC converter; the wind generation sets are respectively connected with the alternating current sides of the corresponding AC/DC converters, and the direct current sides of the AC/DC converters are sequentially connected in series between the positive pole and the negative pole of the cascade direct current bus.
According to the cascade energy storage system, the corresponding DC/DC converters connected with the battery modules of each phase are sequentially connected in series between the positive electrode and the negative electrode of the cascade direct-current bus; the alternating current side of the cascade direct current bus is connected in parallel with each DC/AC conversion unit of the alternating current power grid, and the direct current side of the cascade direct current bus is also sequentially connected in series between the positive pole and the negative pole of the cascade direct current bus; and then utilize the cascade of power electronics conversion equipment, realized the promotion of direct current side voltage, constructed high voltage direct current energy storage system, improved conversion efficiency and power density.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1a and 1b are schematic structural diagrams of an energy storage system provided by the prior art respectively;
fig. 2 to fig. 6 are schematic structural diagrams of five cascaded energy storage systems according to embodiments of the present disclosure;
fig. 7 is a schematic structural diagram of a light storage system according to an embodiment of the present application;
fig. 8a and fig. 8b are two schematic structural diagrams of a wind storage system according to an embodiment of the present application, respectively;
fig. 9 is a schematic structural diagram of a wind-solar energy storage system provided in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
With the increase of the capacity of the energy storage system, the voltage increase becomes a preferred energy storage system scheme with high power density and high energy density, and therefore, the application provides a cascaded energy storage system to improve the conversion efficiency and the power density.
Referring to fig. 2, the cascaded energy storage system includes: at least two DC/AC conversion units 10, and, at least two battery modules 30 and their DC/DC converters 20; wherein:
the AC side of each DC/AC conversion unit 10 is connected to an AC power grid, i.e. the AC side of each DC/AC conversion unit 10 is connected in parallel, which may be a low voltage AC power grid.
The direct current side of each DC/AC conversion unit 10 is sequentially connected in series between the positive electrode and the negative electrode of the cascade direct current bus; that is, the DC sides of the DC/AC conversion units 10 are cascaded, so that the voltage between the positive and negative electrodes of the cascaded DC bus is relatively high, and can reach a certain preset level, and further, power transmission can be performed with other parts of the system by using the relatively high level DC voltage.
Each battery module 30 is connected to one side of the corresponding DC/DC converter 20, and each DC/DC converter 20 is used to convert electric energy between the other side thereof and the corresponding battery module 30, and charge or discharge the corresponding battery module 30.
The other side of each DC/DC converter 20 is also connected in series between the positive and negative poles of the cascade DC bus.
In the cascade energy storage system provided in this embodiment, the corresponding DC/DC converters 20 connected to the battery modules 30 of each phase are sequentially connected in series between the positive and negative electrodes of the cascade DC bus; the alternating current side of each DC/AC conversion unit 10 is connected in parallel with the alternating current power grid, and the direct current side of each DC/AC conversion unit is also sequentially connected in series between the positive pole and the negative pole of the cascade direct current bus; and then utilize the cascade of power electronics conversion equipment, realized the promotion of direct current side voltage, constructed high voltage direct current energy storage system with low pressure alternating current electric wire netting, energy storage battery and cascade power electronics device, promptly, this embodiment provides a high voltage direct current energy storage system and network deployment scheme based on cascade structure, realizes an energy storage system of high conversion efficiency, high power density, high energy density.
It should be noted that each DC/AC conversion unit and each DC/DC converter 20 connected in series between the positive and negative electrodes of the cascade DC bus can respectively bear one part of the voltage between the positive and negative electrodes of the cascade DC bus, thereby reducing the withstand voltage level of the power devices in each DC/AC conversion unit 10 and each DC/DC converter 20; when the parameters of each DC/AC conversion unit 10 are set to be the same, the DC side thereof may equally divide the voltage between the positive and negative electrodes of the cascade DC bus; when the parameters of each DC/DC converter 20 are set to be the same, the corresponding side thereof may also equally divide the voltage between the positive and negative electrodes of the cascade DC bus.
Based on the above embodiment, it is preferable that the cascaded energy storage system further has an AC side of each DC/AC conversion unit 10 connected to an AC load.
That is, the cascade energy storage system provides an ac interface to the outside, and can be connected to an ac power grid or an ac load to realize connection between the energy storage system and the ac power grid load.
In addition, the cascade energy storage system may further include the following components shown in fig. 3: and the direct current interfaces are led out from the positive electrode and the negative electrode of the cascade direct current bus to be connected with a direct current power grid and/or a direct current load.
The cascade branches of the DC/DC converters 20 and the cascade branches of the DC/AC conversion units 10 described in the previous embodiment are connected in parallel to form a high-voltage DC bus (i.e., the cascade DC bus), such as a 35kV DC bus; meanwhile, direct current ends are led out from the positive electrode and the negative electrode of the cascade direct current bus, and a high-voltage direct current interface is provided for the outside and is used for connecting a direct current power grid to realize the connection of the cascade energy storage system and the direct current power grid; and/or the power supply for other high-voltage direct-current loads can be realized by connecting the direct-current loads.
That is, the cascade energy storage system provided by this embodiment can realize direct current coupling and alternating current coupling simultaneously, and power trend is abundant, realizes the flexibility of electric wire netting or load power scheduling.
Based on the above embodiment, optionally, in the cascaded energy storage system, the battery module 30 may include: a battery cluster, or, alternatively, may include: at least two battery clusters connected in parallel; and the battery cluster may include: a battery pack, or, alternatively, may include: at least two battery packs connected in series; all of which depend on the specific application environment and are within the scope of the present application.
In practical applications, each DC/AC conversion unit 10 may also include the following components shown in fig. 4: a DC/AC converter 101 and a transformer 102; the direct current side of each DC/AC converter 101 is sequentially connected in series between the positive electrode and the negative electrode of the cascade direct current bus; the AC side of each DC/AC converter 101 is connected to an AC grid via a corresponding transformer 102.
Alternatively, each DC/AC conversion unit 10 may include only the components shown in fig. 5: a DC/AC converter 101; the direct current side of each DC/AC converter 101 is sequentially connected in series between the positive electrode and the negative electrode of the cascade direct current bus; the AC side of each DC/AC converter 101 is connected to an AC grid via the same transformer 102.
Taking the structure shown in fig. 4 as an example, in the cascaded energy storage system provided in this embodiment, an AC power grid is connected to the cascaded DC/AC converters 101 through a plurality of transformers 102, each DC/AC converter 101 is respectively used as a module unit, and a direct current side of each DC/AC converter is sequentially connected in series to form a high voltage direct current unit; meanwhile, each set of energy storage batteries (i.e. the battery module 30) is connected in series through a corresponding DC converter unit (i.e. the DC/AC conversion unit 10) to form another high voltage DC unit. Two high-voltage direct-current units are connected in parallel to form the high-voltage cascade direct-current bus.
Regardless of whether each DC/AC conversion unit 10 adopts the structure shown in fig. 4 or fig. 5, the DC/AC converter 101 can be as shown in fig. 6 (shown by way of example on the basis of fig. 4): a three-phase full bridge inverter.
Also, each DC/DC converter 20 may be as shown in fig. 6: a Boost circuit; the low-voltage side of each Boost circuit is connected with the corresponding battery module 30; and the high-voltage sides of the Boost circuits are sequentially connected in series between the positive electrode and the negative electrode of the cascade direct-current bus.
In practical applications, the topologies of the DC/AC converters 101 and the DC/DC converters 20 can also be implemented in other forms in the prior art, and are not limited to the one shown in fig. 6, depending on the specific application environment, and are within the protection scope of the present application.
Another embodiment of the present application provides a light storage system, as shown in fig. 7, including: a photovoltaic system 400, and a cascaded energy storage system as described in any of the above embodiments (shown by way of example in the configuration of fig. 2); wherein:
the photovoltaic system 400 is connected between the positive and negative poles of the cascade dc bus of the cascade energy storage system.
In practical applications, the photovoltaic system 400 includes: a photovoltaic array and at least one photovoltaic DC/DC converter 401; the low-voltage side of each photovoltaic DC/DC converter 401 is connected to a corresponding photovoltaic string 402 in the photovoltaic array; the high-voltage sides of the photovoltaic DC/DC converters 401 are sequentially connected in series, so that the voltage after series connection can reach the voltage between the positive and negative electrodes of the cascade DC bus in the cascade energy storage system, and further can be connected in parallel with the cascade DC bus, so as to implement grid-connected power generation or charge each battery module 30 through the cascade DC bus.
The structure and principle of the cascade energy storage system can be seen from the above embodiments, and are not described in detail here.
Another embodiment of the present application provides a wind storage system, as shown in fig. 8a or fig. 8b, including: a wind power generation system 500, and a cascaded energy storage system as described in any of the above embodiments (shown by way of example in fig. 2); wherein:
referring to fig. 8a, a wind power generation system 500 is connected to an ac grid; in this case, the wind turbine generator system 500 includes: at least one wind turbine 501 and its corresponding wind power converter 502; each wind turbine 501 is connected with the alternating current side of a machine side converter in a corresponding wind power converter 502, the direct current side of the machine side converter is connected with the direct current side of a grid side converter in the wind power converter 502, and the alternating current side of the grid side converter is connected with an alternating current power grid; in practical applications, the ac side of each grid-side converter may be connected to the ac grid via the same transformer (as shown in fig. 8 a), or the ac side of each grid-side converter may be connected to the ac grid via a respective transformer (not shown).
Alternatively, referring to fig. 8b, each dc side of the wind power generation system 500 is cascade-connected between the positive and negative poles of the cascade dc bus of the cascade energy storage system. In this case, the wind turbine generator system 500 includes: at least one wind turbine 501 and its corresponding AC/DC converter 503; each wind turbine 501 is connected to the AC side of a corresponding AC/DC converter 503, and the DC sides of the AC/DC converters 503 are sequentially connected in series between the positive and negative poles of the cascade DC bus of the cascade energy storage system. Furthermore, the wind power generation system 500 may implement grid-connected power generation or charge each battery module 30 through the cascade dc bus; and also. With the structure, the wind power generation system 500 performs grid-connected power generation on an alternating current power grid by using each DC/AC conversion unit 10 in the cascade energy storage system, so that a grid-side converter which needs to be configured originally can be omitted, and the structural cost is reduced.
The structure and principle of the cascade energy storage system can be seen from the above embodiments, and are not described in detail here.
Another embodiment of the present application provides a wind-solar energy storage system, referring to fig. 9, including: a photovoltaic system 400, a wind power generation system 500 (shown by way of example in the configuration of fig. 8 b), and a cascaded energy storage system as described in any of the embodiments above; wherein:
the photovoltaic system 400 is connected between the positive and negative electrodes of the cascade direct-current bus of the cascade energy storage system; the photovoltaic system 400 includes: a photovoltaic array and at least one photovoltaic DC/DC converter 401; the specific structure and principle of the method can be seen in the embodiment shown in fig. 7, and details are not repeated here.
In this case, the wind power generation system 500 is connected to an ac grid, and the wind power generation system 500 includes: at least one wind turbine 501 and its corresponding wind power converter 502; the specific structure and principle of the method can be seen in the embodiment shown in fig. 8a, and details are not repeated here. Alternatively, each dc side of the wind power generation system 500 is cascade-connected between the positive and negative electrodes of the cascade dc bus, in this case, the wind power generation system 500 includes: at least one wind turbine 501 and its corresponding AC/DC converter 503; the specific structure and principle of the method can be seen in the embodiment shown in fig. 8b, and details are not repeated here.
The structure and principle of the cascade energy storage system can be seen from the above embodiments, and are not described in detail here.
The same and similar parts among the various embodiments in the present specification are referred to each other, and each embodiment focuses on differences from other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the technical solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the above description of the disclosed embodiments, the features described in the embodiments may be interchanged or combined with each other to enable those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (15)

1. A cascaded energy storage system, comprising: at least two DC/AC conversion units, and, at least two battery modules and their DC/DC converters; wherein,
the alternating current side of each DC/AC conversion unit is respectively connected with an alternating current power grid;
the direct current sides of the DC/AC conversion units are sequentially connected in series between the positive electrode and the negative electrode of the cascade direct current bus;
each battery module is connected with one side of the corresponding DC/DC converter;
and the other side of each DC/DC converter is sequentially connected in series between the anode and the cathode of the cascade direct-current bus.
2. The cascaded energy storage system of claim 1, further comprising: and direct current interfaces led out from the positive electrode and the negative electrode of the cascade direct current bus are used for connecting a direct current power grid and/or a direct current load.
3. The cascaded energy storage system of claim 1, wherein each of the DC/DC converters is: a Boost circuit;
the low-voltage side of each Boost circuit is respectively connected with the corresponding battery module;
and the high-voltage side of each Boost circuit is sequentially connected in series between the positive electrode and the negative electrode of the cascade direct-current bus.
4. The cascaded energy storage system of claim 1, wherein each of the DC/AC conversion units comprises: DC/AC converter and transformer;
the direct current side of each DC/AC converter is sequentially connected in series between the anode and the cathode of the cascade direct current bus;
and the alternating current side of each DC/AC converter is connected with the alternating current power grid through the corresponding transformer.
5. The cascaded energy storage system of claim 1, wherein each of the DC/AC conversion units comprises: a DC/AC converter;
the direct current side of each DC/AC converter is sequentially connected in series between the positive electrode and the negative electrode of the cascade direct current bus;
and the alternating current side of each DC/AC converter is connected with the alternating current power grid through the same transformer.
6. The cascaded energy storage system of claim 4 or 5, wherein the DC/AC converter is: three-phase full bridge inverter.
7. The cascaded energy storage system of any of claims 1 to 5, wherein the battery module comprises: one battery cluster, or, at least two battery clusters connected in parallel;
the battery cluster comprises: one battery pack, or at least two battery packs connected in series.
8. The cascaded energy storage system of any one of claims 1 to 5, wherein an AC side of each DC/AC conversion unit is further connected to an AC load.
9. A light storage system, comprising: a photovoltaic system, and a cascaded energy storage system as claimed in any one of claims 1 to 8;
the photovoltaic system is connected between the positive electrode and the negative electrode of the cascade direct-current bus of the cascade energy storage system.
10. A light storage system according to claim 9 wherein said photovoltaic system comprises: a photovoltaic array and at least one photovoltaic DC/DC converter;
the low-voltage side of each photovoltaic DC/DC converter is respectively connected with a corresponding photovoltaic group string in the photovoltaic array;
and the high-voltage side of each photovoltaic DC/DC converter is sequentially connected in series between the anode and the cathode of the cascade direct-current bus.
11. A wind storage system, comprising: a wind power generation system, and a cascaded energy storage system according to any one of claims 1 to 8;
the wind power generation system is connected with an alternating current power grid, or each direct current side of the wind power generation system is connected between the positive electrode and the negative electrode of the cascade direct current bus of the cascade energy storage system in a cascade mode.
12. A wind storage system according to claim 11, wherein said wind power system comprises: at least one wind turbine and its corresponding wind power converter; the wind power generation units are respectively connected with the alternating current side of a machine side converter in the wind power converter, the direct current side of the machine side converter is connected with the direct current side of a grid side converter in the wind power converter, and the alternating current side of the grid side converter is connected with an alternating current power grid;
alternatively, the wind power generation system comprises: at least one wind turbine and its corresponding AC/DC converter; the wind generation sets are respectively connected with the alternating current sides of the corresponding AC/DC converters, and the direct current sides of the AC/DC converters are sequentially connected in series between the positive pole and the negative pole of the cascade direct current bus.
13. A wind-solar energy storage system, comprising: a photovoltaic system, a wind power generation system, and a cascaded energy storage system according to any one of claims 1 to 8;
the photovoltaic system is connected between the positive electrode and the negative electrode of the cascade direct-current bus of the cascade energy storage system;
the wind power generation system is connected with an alternating current power grid, or each direct current side of the wind power generation system is connected between the positive electrode and the negative electrode of the cascade direct current bus in a cascade mode.
14. The wind, photovoltaic, and energy storage system of claim 13, wherein the photovoltaic system comprises: a photovoltaic array and at least one photovoltaic DC/DC converter;
the low-voltage side of each photovoltaic DC/DC converter is respectively connected with a corresponding photovoltaic group string in the photovoltaic array;
and the high-voltage side of each photovoltaic DC/DC converter is sequentially connected in series between the positive electrode and the negative electrode of the cascade direct-current bus.
15. The wind, photovoltaic, and energy storage system of claim 13, wherein the wind power generation system comprises: at least one wind turbine and its corresponding wind power converter; the wind power generation units are respectively connected with the alternating current side of a machine side converter in the wind power converter, the direct current side of the machine side converter is connected with the direct current side of a grid side converter in the wind power converter, and the alternating current side of the grid side converter is connected with an alternating current power grid;
alternatively, the wind power generation system comprises: at least one wind turbine and its corresponding AC/DC converter; the wind generation sets are respectively connected with the alternating current sides of the corresponding AC/DC converters, and the direct current sides of the AC/DC converters are sequentially connected in series between the positive pole and the negative pole of the cascade direct current bus.
CN202221254175.1U 2022-05-24 2022-05-24 Cascade type energy storage system, light storage system, wind storage system and wind and light storage system Active CN217824284U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202221254175.1U CN217824284U (en) 2022-05-24 2022-05-24 Cascade type energy storage system, light storage system, wind storage system and wind and light storage system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202221254175.1U CN217824284U (en) 2022-05-24 2022-05-24 Cascade type energy storage system, light storage system, wind storage system and wind and light storage system

Publications (1)

Publication Number Publication Date
CN217824284U true CN217824284U (en) 2022-11-15

Family

ID=83985472

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202221254175.1U Active CN217824284U (en) 2022-05-24 2022-05-24 Cascade type energy storage system, light storage system, wind storage system and wind and light storage system

Country Status (1)

Country Link
CN (1) CN217824284U (en)

Similar Documents

Publication Publication Date Title
CN102097966A (en) Cascade megawatt photovoltaic grid-connected inverter
CN101710716A (en) Grid-connected inverter capable of reducing electrolytic capacitance
CN202424196U (en) Large-capacity energy storage converter formed by connecting multiple groups of inverter units in parallel
CN203313097U (en) Large power photovoltaic power generation system
CN213585162U (en) AC/DC power supply structure of data center
CN103915856A (en) Base station grid connected-charging photovoltaic micro-inverter system and control method thereof
CN207530550U (en) Transmission system based on wind power plant
CN108631356B (en) Converter for wind power plant power transmission system and wind power plant power transmission system
CN202435113U (en) Inverter auxiliary power supply electricity-getting circuit
CN205304269U (en) Direct current pressure increasing system of grid -connected PV electricity generation
CN217824282U (en) Wind-solar energy storage system and wind-solar energy storage converter
CN217824284U (en) Cascade type energy storage system, light storage system, wind storage system and wind and light storage system
KR20140123833A (en) AC-connected power conversion circuit
CN214590630U (en) Electric energy transmission device and power generation system
CN107017798B (en) A kind of modular multi-level converter topology with energy-storage function
CN113162414B (en) Base unit for electric energy converter, electric energy converter and universal power interface
CN115537834A (en) New energy off-grid hydrogen production system and method
CN212323744U (en) Battery device, energy storage system and light storage inversion system
CN207588466U (en) For the current transformer of wind power plant transmission system and wind power plant transmission system
CN208707366U (en) A kind of high capacity cell energy storage power converter plant
CN202084952U (en) On-grid power converter device of switched reluctance generator
CN104467653A (en) Bipolar photovoltaic system topology structure and application thereof
CN217183035U (en) Cascade type energy storage system
CN216437063U (en) High-voltage inverter topology circuit
CN217036752U (en) Transformer substation direct current power supply device and system connected with new energy

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant