Modular converter energy storage circuit, energy storage cabinet and energy storage system

Abstract

The embodiment of the utility model relates to the technical field of electric power systems, in particular to a modular converter energy storage circuit, an energy storage cabinet and an energy storage system. According to the utility model, through modular design, independent operation of each functional module of the energy storage module is realized, when one module breaks down, normal operation of other modules is not influenced, and through hot plug characteristics, rapid repair can be realized, and installation and repair time is shortened. Along with service increase or equipment increase, a user can easily add or replace modules without replacing the whole system, the cost and complexity of future upgrading are reduced, and high expansibility and flexibility are achieved. Besides, due to the modular design, the system can more accurately manage the load of each module, more efficient energy utilization is achieved, especially under the condition of light load or partial load, the working mode can be automatically adjusted, and unnecessary energy consumption is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to power system technical field especially relates to a modularization converter energy storage circuit, energy storage cabinet and energy storage system. BACKGROUND

[0002] This section aims to provide background or context for the embodiments of the utility model recited in the claims. The description herein does not admit to be prior art because of being included in this section.

[0003] In today's rapidly evolving energy pattern, energy storage technology is increasingly valued for its unique value. As the core component of the energy storage system, the energy storage converter (Power Conversion System, PCS for short) undertakes the important task of energy conversion and regulation, and its role not only lies in efficient and flexible energy storage applications, but also provides a solid foundation for building modern smart grids. In traditional energy storage projects, tower machines are generally used as converters to charge and discharge batteries. Due to the small internal space, this method has the disadvantages of poor heat dissipation performance, poor expandability, difficulty in large-scale expansion, and high maintenance cost.

[0004] Therefore, the prior art still needs to be further improved. UTILITY MODEL CONTENT

[0005] The utility model discloses a purpose is to solve the prior art heat dissipation performance is poor, and the expandability is poor, not easy to carry out large-scale expansion, and the maintenance cost is high, proposes a modularization converter energy storage circuit, energy storage cabinet and energy storage system, has high reliability and usability, high expansibility and flexibility, high efficiency and so on The advantages of efficiency.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme.

[0007] Firstly, on the one hand, the utility model provides a kind of modularization converter energy storage circuit, and the energy storage circuit includes N energy storage bidirectional AC / DC converters and M battery clusters, each energy storage bidirectional AC / DC converter is connected to power grid and corresponding battery cluster by switch respectively, wherein M and N are integer greater than 1.

[0008] In some embodiments, 1

[0009] Further, the rated power of the energy storage bidirectional AC / DC converter is 100KW.

[0010] Further, each energy storage bidirectional AC / DC converter is connected with individual communication line, for communicating with battery management system.

[0011] In another aspect, the utility model still through a kind of modular converter energy storage cabinet, the energy storage cabinet is applied to industrial and commercial energy storage system, including above-mentioned energy storage circuit, and realizes energy storage management by the energy storage circuit.

[0012] Further, the energy storage bidirectional AC / DC converter in the energy storage cabinet can be added or removed, to realize the expansion or capacity reduction of the energy storage system.

[0013] Further, it further includes battery management system, and each energy storage bidirectional AC / DC converter is communicated with corresponding battery management system by separate communication line.

[0014] In another aspect, the utility model still through a kind of modular converter energy storage system, including above-mentioned energy storage cabinet.

[0015] Further, it further includes display device, and the display device is used to monitor, read and set the data of energy storage cabinet.

[0016] Further, it further includes control module, for adjusting system operating mode according to grid load condition, and automatically performing load balancing adjustment according to energy storage cabinet state, predicted fault.

[0017] The utility model has the following beneficial effects:

[0018] 1, high reliability and availability: each functional module of energy storage module runs independently, when one module fails, it will not affect the normal work of other modules, and it can be quickly repaired through hot plug feature, to shorten installation and repair time.

[0019] 2, high expansibility and flexibility: with the growth of business or equipment increase, users can easily add or replace modules without replacing the entire system, reducing the cost and complexity of future upgrade.

[0020] 3, high efficiency: modular design enables the system to more accurately manage the load of each module, achieving more efficient energy utilization, especially in light or partial load conditions, it can automatically adjust working mode to reduce unnecessary energy consumption.

[0021] 4, intelligent management: equipped with advanced monitoring and management system, can real-time monitor equipment state, predict fault and automatically perform load balancing adjustment, improve the stability and reliability of system. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings described herein are used to provide further understanding of the utility model, and constitute a part of the present application, and the illustrative embodiment of the utility model and its explanation are used to explain the utility model, and do not constitute undue limitation on the utility model. In the drawings:

[0023] Figure 1 is the energy storage circuit diagram of the modular converter of the embodiment 1 of the utility model;

[0024] Figure 2 is the communication loop diagram of the energy storage cabinet of the modular converter of the embodiment 1 of the utility model;

[0025] Figure 3 is the fan design loop diagram of the energy storage cabinet of the modular converter of the embodiment 1 of the utility model. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the utility model more clearly and clearly, the utility model is further explained in detail below by combining with the embodiment and the drawing, the schematic embodiment and the explanation thereof of the utility model are only used to explain the utility model, and do not serve as the limitation of the utility model.

[0027] It should be noted that the following described embodiments or the technical features can be combined to form new embodiments arbitrarily without conflict, and also belong to the protection scope of the utility model.

[0028] In the description of the utility model, the following terms need to be explained:

[0029] For the orientation words, the orientation and position relationship of the terms "center", "transverse", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like in the specification and claims of the present application are based on the orientation or position relationship shown in the drawing, and are only for the convenience of describing the utility model and simplifying the description, and not for indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as limiting the specific protection scope of the utility model.

[0030] The terms "first", "second" and the like in the specification and claims of the present application are used to distinguish similar objects, and do not necessarily describe a particular order or sequence.

[0031] The terms "include" and "have" and any variations thereof in the specification and claims of the present application are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0032] When an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or may have an intervening element present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or may have an intervening element present. When an element is referred to as being "provided with" another element, it can be located on the surface or inside the element.

[0033] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprising" shall be understood to include the stated elements or components without excluding other elements or other components.

[0034] In the specification and claims of this application, the term "electrical connection" can refer to a physical contact circuit connection, a communication connection, a wired communication connection, or a wireless communication connection.

[0035] Example 1

[0036] First, this embodiment provides a modular converter energy storage circuit, such as... Figure 1 As shown, the energy storage circuit includes N bidirectional AC / DC converters and M battery clusters. Each bidirectional AC / DC converter is connected to the power grid and the corresponding battery cluster via a switch. M and N are integers greater than 1, and M and N can be equal or unequal. That is, one bidirectional AC / DC converter can be connected to one battery cluster, multiple bidirectional AC / DC converters can be connected to one battery cluster, or one bidirectional AC / DC converter can be connected to multiple battery clusters. In some embodiments, 1 < M = N < 16, meaning the bidirectional AC / DC converters and battery clusters are connected in a one-to-one correspondence. In this embodiment, M = N = 8, meaning 8 bidirectional AC / DC converters correspond to 8 battery clusters. In this embodiment, the 8 bidirectional AC / DC converters and 8 battery clusters are connected in a one-to-one correspondence.

[0037] Figure 1 The component codes in the circuit are explained as follows:

[0038] 1. QF-AC: Connection switch between energy storage converter cabinet and power grid

[0039] 2. QF1-QF8: Connection switches between the energy storage converter cabinet and the battery

[0040] 3. PCS1-PCS8: 100KW Modular Energy Storage Bidirectional AC / DC Converter (PCS)

[0041] 4. QF9: Surge protector backup switch

[0042] 5. SPD: Surge Protector

[0043] The energy storage circuit of the embodiment is applied to an energy storage system of industry and commerce, and a 100KW-modular energy storage bidirectional AC / DC converter (PCS) is adopted.

[0044] In another aspect, the utility model also provides a kind of modular converter energy storage cabinet, the energy storage cabinet is applied to industry and commerce energy storage system, including above-mentioned energy storage circuit, and realizes energy storage management by the energy storage circuit.The energy storage cabinet of the embodiment is a kind of modular converter energy storage cabinet system, has integrated modular design, supports on-grid and off-grid full power, and a 100KW-modular energy storage bidirectional AC / DC converter (PCS) is adopted in the embodiment.It can be well applied to the cluster management of battery, which is the advantage that tower machine cannot have, and the design is described by an 800KW-energy storage converter cabinet, including but not limited to 800KW energy storage converter cabinet, and the design can be well expanded and reduced in capacity, up to 16 machines in parallel, and at least one cabinet, without problem, which can be well adapted to the demand of industry and commerce energy storage battery for converter.

[0045] Further, the energy storage cabinet of the embodiment further includes a battery management system, and each energy storage bidirectional AC / DC converter communicates with the corresponding battery management system through a separate communication line. Figure 2 Each module separately leads out a communication line and communicates with battery BMS, and when a module fails, it does not affect the normal operation of other modules, is convenient to repair and maintain, can reduce maintenance time and increase benefits.

[0046] The cooling mode of the energy storage converter PCS module in the energy storage cabinet of the embodiment adopts forced air cooling, and the module heat dissipation mode is front air inlet and rear air outlet, and two fans are further added in the cabinet, and the unique air duct design can effectively discharge hot air out of the cabinet. Figure 3 A loop is designed for the fan in the energy storage cabinet.

[0047] In another aspect, the utility model also provides a kind of modular converter energy storage system, including above-mentioned energy storage cabinet.In order to improve the convenience of use, the system further includes a display device, and the display device is used to monitor, read and set and modify the data of the energy storage cabinet.Specifically, the system is equipped with a 7-inch screen, and a liquid crystal 7-inch HMI screen is installed on the front of the cabinet door.The user can monitor the equipment, read and set and modify the data of the energy storage cabinet through the HMI.

[0048] In order to further improve the intelligence of the system, the system further comprises a control module for adjusting the system operation mode according to the power grid load condition, and automatically adjusting the load balancing according to the energy storage cabinet state and predicted failure. The block design enables the system to more accurately manage the load of each module, achieve more efficient energy utilization, especially in light load or partial load conditions, automatically adjust the operation mode, and reduce unnecessary energy consumption. Equipped with an advanced monitoring and management system, it can monitor the equipment state in real time, predict failure and automatically adjust the load balancing, improving the stability and reliability of the system.

[0049] Finally, it should be pointed out that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit it. Although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A modular converter energy storage circuit, characterized in that, The energy storage circuit includes N bidirectional AC / DC converters and M battery clusters. Each bidirectional AC / DC converter is connected to the power grid and the corresponding battery cluster via a switch, where M and N are integers greater than 1.

2. The energy storage circuit according to claim 1, characterized in that, 1 < M = N < 16, and the energy storage bidirectional AC / DC converter is connected to the battery cluster in a one-to-one correspondence.

3. The energy storage circuit according to claim 1, characterized in that, The rated power of the energy storage bidirectional AC / DC converter is 100KW.

4. The energy storage circuit according to claim 1, characterized in that, Each energy storage bidirectional AC / DC converter is connected to a separate communication line for communicating with the battery management system.

5. A modular converter energy storage cabinet, characterized in that, The energy storage cabinet is used in industrial and commercial energy storage systems, including the energy storage circuit as described in any one of claims 1 to 4, and realizes energy storage management through the energy storage circuit.

6. The energy storage cabinet according to claim 5, characterized in that, The bidirectional AC / DC converter in the energy storage cabinet can be added or removed to expand or reduce the capacity of the energy storage system.

7. The energy storage cabinet according to claim 6, characterized in that, It also includes a battery management system, with each bidirectional AC / DC converter communicating with its corresponding battery management system via a separate communication line.

8. A modular converter energy storage system, characterized in that, Includes the energy storage cabinet as described in claim 7.

9. The modular converter energy storage system according to claim 8, characterized in that, It also includes a display device for monitoring, reading, and setting / modifying data in the energy storage cabinet.

10. The modular converter energy storage system according to claim 8, characterized in that, It also includes a control module, which is used to adjust the system operating mode according to the grid load, and to predict faults and automatically adjust the load balance according to the status of the energy storage cabinet.

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