Energy storage inverter cabinet and energy storage inverter system

Abstract

The utility model discloses an energy storage inverter cabinet and an energy storage inverter system. The energy storage inverter cabinet comprises a battery cabinet, a direct-current switch, an energy storage inverter and an alternating-current switch which are connected in sequence. A first fuse is arranged between the direct current switch and the energy storage inverter, and / or a second fuse is arranged between the energy storage inverter and the alternating current switch. The first fuse or the second fuse comprises a first diversion part, a second diversion part, a breaker, a current sensor and a first control unit; the first end of the breaker is connected with the first flow guide part, the second end of the breaker is connected with the second flow guide part, and the third end of the breaker is connected with the first control unit; the current sensor is used for detecting the current of the first diversion part and / or the second diversion part; and the first control unit is used for controlling the breaker to be disconnected based on the current of the first diversion part and / or the second diversion part. According to the application, the risks of arc discharge, fire catching and the like caused by short circuit, overload, overcurrent and the like of the energy storage inverter or the battery cabinet can be reduced.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an energy storage inverter cabinet and an energy storage inverter system. Background Art

[0002] Electrical safety in existing energy storage inverter systems is crucial. If major safety accidents such as arcing, ablation, or smoke and fire caused by short circuits, overloads, and overcurrents occur during actual operation, it will cause huge losses to the energy storage power station.

[0003] Currently, the DC circuit of energy storage inverter systems (the circuit between the DC side of the energy storage inverter and the battery cabinet) is typically protected by isolating switches and fuses. Isolating switches can interrupt the rated voltage and current, providing safety isolation and personal protection during system maintenance. If a fault current occurs, fuses cut off the fault current, protecting the energy storage inverter and battery cabinet.

[0004] In the above solution, if a DC circuit short circuit occurs, the DC circuit fuse will operate before the DC circuit fuse, as the DC circuit fuse's rated current is typically higher, its I²T (Joule integral) energy is higher, and its melting speed is relatively slow. In contrast, the battery cabinet fuse's rated current is typically lower, its I²T energy is lower, and its melting speed is relatively faster. As is well known, battery cabinet fuses are numerous, and subsequent maintenance of damaged battery cabinet fuses requires considerable manpower and resources. Therefore, DC circuit fuses currently cannot effectively protect the downstream battery cabinet loads.

[0005] Furthermore, the AC circuit of an energy storage inverter system (the circuit between the AC side of the energy storage inverter and the AC load or grid) is typically protected by a circuit breaker. A circuit breaker can manually control the AC circuit's on and off times, and can also proactively interrupt a certain amount of short-circuit fault current. However, if the short-circuit fault current exceeds the circuit breaker's short-circuit breaking capacity, it may cause the circuit breaker to explode or catch fire. Furthermore, the circuit breaker takes a long time to interrupt the short-circuit fault current, and the I²T energy of the interrupted current exceeds the maximum I²T energy tolerance of the power devices in the energy storage inverter. Therefore, relying solely on a circuit breaker for AC circuit protection cannot effectively prevent all fault currents. Utility Model Content

[0006] The present application aims to provide an energy storage inverter cabinet and an energy storage inverter system to reduce the risks of arcing, fire, etc. caused by short circuit, overload, overcurrent, etc. in energy storage inverters or battery cabinets.

[0007] On one hand, the present application provides an energy storage inverter system, comprising a battery cabinet, a DC switch, an energy storage inverter, and an AC switch connected in sequence; a first fuse is further provided between the DC switch and the DC end of the energy storage inverter, and / or a second fuse is further provided between the AC end of the energy storage inverter and the AC switch;

[0008] Wherein, the first fuse or the second fuse includes a first current guide part, a second current guide part, a breaker, a current sensor and a first control unit; the first end of the breaker is connected to the first current guide part, the second end of the breaker is connected to the second current guide part, and the third end of the breaker is connected to the first control unit; the current sensor is used to detect the current of the first current guide part and / or the second current guide part; the first control unit is used to control the breaker to disconnect based on the current of the first current guide part and / or the second current guide part.

[0009] On the other hand, the present application provides an energy storage inverter cabinet, wherein a DC switch, an energy storage inverter, and an AC switch are provided in the energy storage inverter cabinet; a first fuse is further provided between the DC switch and the DC end of the energy storage inverter, and / or a second fuse is further provided between the AC end of the energy storage inverter and the AC switch;

[0010] Wherein, the first fuse or the second fuse includes a first current guide part, a second current guide part, a breaker, a current sensor and a first control unit; the first end of the breaker is connected to the first current guide part, the second end of the breaker is connected to the second current guide part, and the third end of the breaker is connected to the first control unit; the current sensor is used to detect the current of the first current guide part and / or the second current guide part; the first control unit is used to control the breaker to disconnect based on the current of the first current guide part and / or the second current guide part.

[0011] The energy storage inverter cabinet and energy storage inverter system provided in this application can control the disconnection of the breaker when a fault current exists through the breaker, current sensor and control unit arranged in the fuse, thereby reducing the risks of arcing, fire, etc. caused by short circuit, overload, overcurrent, etc. in the energy storage inverter or battery cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of an energy storage inverter system provided in an embodiment of the present application;

[0013] Figure 2 This is a schematic diagram of a fuse provided in an embodiment of the present application.

[0014] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0015] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clearer and more understandable, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0016] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0017] like Figure 1 As shown, an embodiment of the present application provides an energy storage inverter system, comprising a battery cabinet, a DC switch, an energy storage inverter, and an AC switch connected in sequence; a first fuse is further provided between the DC switch and the DC end of the energy storage inverter, and / or a second fuse is further provided between the AC end of the energy storage inverter and the AC switch.

[0018] like Figure 2 As shown, in one example, the first fuse or the second fuse includes a first current guide part (part d11 to d12 in the figure), a second current guide part (part d21 to d22 in the figure), a breaker, a current sensor and a first control unit; the first end of the breaker (shown in 1 in the figure) is connected to the first current guide part (shown in d12 in the figure), the second end of the breaker (shown in 2 in the figure) is connected to the second current guide part (shown in d21 in the figure), and the third end of the breaker (shown in 3 in the figure) is connected to the first control unit; the current sensor is used to detect the current of the first current guide part and / or the second current guide part; the first control unit is used to control the breaker to disconnect based on the current of the first current guide part and / or the second current guide part.

[0019] It is understandable that d11 of the first conducting part and d22 of the second conducting part are connected to external devices, such as the DC switch and the DC end of the energy storage inverter, or the AC end of the energy storage inverter and the AC switch.

[0020] In one example, the energy storage inverter system further includes a power supply for supplying power to the first control unit. It is understandable that the power supply can be integrated into the fuse or can be independent of the fuse.

[0021] In one example, the first fuse or the second fuse further includes an arc extinguisher, one end of the arc extinguisher is connected to the first end of the breaker, and the other end of the arc extinguisher is connected to the second end of the breaker, wherein the arc extinguisher includes an arc-extinguishing fuse.

[0022] In one example, the first guide portion or the second guide portion includes a copper busbar. The first guide portion or the second guide portion using the copper busbar has relatively high mechanical strength, thereby improving the anti-vibration adaptability of the system.

[0023] In one example, the DC switch includes an isolating switch.

[0024] In one example, the AC switch includes a circuit breaker.

[0025] In one example, the DC end of the energy storage inverter is connected to the first fuse through a DC bus.

[0026] In the above embodiment, by disposing a first fuse between the DC switch and the DC terminal of the energy storage inverter, when a fault such as a short circuit occurs in the DC circuit, the current sensor in the first fuse can detect the short-circuit fault current and provide feedback to the first control unit, which triggers the breaker to interrupt the short-circuit current. Because the first fuse can quickly operate when detecting a relatively low short-circuit current, it helps shorten the arcing time of the fault current. This results in a very low total I²t value for the short-circuit current interrupted by the entire fuse, ensuring that the fuse in the rear battery cabinet does not operate, thus preventing cabinet failures and fires.

[0027] In the above implementation, by disposing a second fuse between the DC switch and the DC terminal of the energy storage inverter, when a fault such as a short circuit occurs in the AC circuit, the current sensor in the second fuse can detect the short-circuit fault current and provide feedback to the first control unit, which triggers the breaker to interrupt the short-circuit current. Because the second fuse can quickly operate when detecting a relatively low short-circuit current, it helps shorten the arcing time of the fault current. This results in a very low total I²t value for the short-circuit current interrupted by the entire fuse, effectively protecting the downstream inverter module from damage.

[0028] Another embodiment of the present application provides an energy storage inverter cabinet, wherein a DC switch, an energy storage inverter, and an AC switch are provided in the energy storage inverter cabinet; a first fuse is further provided between the DC switch and the DC end of the energy storage inverter, and / or a second fuse is further provided between the AC end of the energy storage inverter and the AC switch;

[0029] Wherein, the first fuse or the second fuse includes a first current guide part, a second current guide part, a breaker, a current sensor and a first control unit; the first end of the breaker is connected to the first current guide part, the second end of the breaker is connected to the second current guide part, and the third end of the breaker is connected to the first control unit; the current sensor is used to detect the current of the first current guide part and / or the second current guide part; the first control unit is used to control the breaker to disconnect based on the current of the first current guide part and / or the second current guide part.

[0030] In one example, a second control unit is further provided in the energy storage inverter cabinet, and the second control unit can be used to control any one of the DC switch, the energy storage inverter, and the AC switch; wherein the second control unit is communicatively connected to the first control unit.

[0031] It should be noted that the contents described in the previous example are also applicable to this example.

[0032] The preferred embodiments of the present application are described above with reference to the accompanying drawings, but are not intended to limit the scope of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and essence of the present application shall fall within the scope of the present application.

Claims

1. An energy storage inverter system, characterized in that: The system comprises a battery cabinet, a DC switch, an energy storage inverter and an AC switch connected in sequence; a first fuse is further provided between the DC switch and the DC end of the energy storage inverter, and / or a second fuse is further provided between the AC end of the energy storage inverter and the AC switch; Wherein, the first fuse or the second fuse includes a first current guide part, a second current guide part, a breaker, a current sensor and a first control unit; the first end of the breaker is connected to the first current guide part, the second end of the breaker is connected to the second current guide part, and the third end of the breaker is connected to the first control unit; the current sensor is used to detect the current of the first current guide part and / or the second current guide part; the first control unit is used to control the breaker to disconnect based on the current of the first current guide part and / or the second current guide part.

2. The energy storage inverter system according to claim 1, characterized in that: The energy storage inverter system further includes a power supply for supplying power to the first control unit.

3. The energy storage inverter system according to claim 1, characterized in that: The first fuse or the second fuse further includes an arc extinguisher, one end of the arc extinguisher is connected to the first end of the breaker, and the other end of the arc extinguisher is connected to the second end of the breaker.

4. The energy storage inverter system according to claim 3, characterized in that: The arc extinguisher includes an arc extinguishing fuse.

5. The energy storage inverter system according to claim 1, characterized in that: The first guide portion or the second guide portion includes a copper busbar.

6. The energy storage inverter system according to claim 1, characterized in that: The DC switch includes an isolating switch.

7. The energy storage inverter system according to claim 1, characterized in that: The AC switch includes a circuit breaker.

8. The energy storage inverter system according to claim 1, characterized in that: The DC end of the energy storage inverter is connected to the first fuse through a DC bus.

9. An energy storage inverter cabinet, characterized in that: The energy storage inverter cabinet is provided with a DC switch, an energy storage inverter, and an AC switch; a first fuse is further provided between the DC switch and the DC end of the energy storage inverter, and / or a second fuse is further provided between the AC end of the energy storage inverter and the AC switch; Wherein, the first fuse or the second fuse includes a first current guide part, a second current guide part, a breaker, a current sensor and a first control unit; the first end of the breaker is connected to the first current guide part, the second end of the breaker is connected to the second current guide part, and the third end of the breaker is connected to the first control unit; the current sensor is used to detect the current of the first current guide part and / or the second current guide part; the first control unit is used to control the breaker to disconnect based on the current of the first current guide part and / or the second current guide part.

10. The energy storage inverter cabinet according to claim 9, characterized in that: A second control unit is also provided in the energy storage inverter cabinet, and the second control unit can be used to control any one of the DC switch, the energy storage inverter, and the AC switch; wherein the second control unit is communicatively connected to the first control unit.

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