Energy storage system with arc discharge detection function between battery clusters
By introducing an arc detection device into the energy storage system, the current and voltage of the DC system can be monitored in real time, solving the problem of the inability to predict electric arcs in existing technologies. This enables accurate detection and prediction of harmful electric arcs, thus avoiding safety accidents such as fires.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-15
- Publication Date
- 2026-03-20
AI Technical Summary
Existing energy storage systems cannot effectively predict and prevent arcing, leading to safety hazards such as fires, and there is a lack of effective preventative designs in the market.
An arc detection device is introduced into the energy storage system, including an arc detection circuit, a current transformer, an operational amplifier, a leakage current detector, and a microcontroller. This device monitors the DC system current and voltage in real time and cuts off the fault circuit through the power control system, thereby achieving accurate detection and prediction of harmful arcs.
It enables accurate detection and prediction of harmful electric arcs, reduces the occurrence of safety accidents such as fires, lowers economic losses, and protects the detection device from damage caused by high current.
Smart Images
Figure CN224021455U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to electrical technology field especially a kind of energy storage system with arc detection function between battery cluster. BACKGROUND
[0002] Arc detection is a technology used to identify and prevent arc phenomena in electrical systems. Arcing refers to the phenomenon of electrical arc produced by the inductive and capacitive characteristics in the load circuit of electrical equipment at the moment of switch-off. This phenomenon can cause current flicker, power loss and equipment damage, and even cause fire accidents and other safety incidents.
[0003] In recent years, the total installed capacity of energy storage has been expanding, and related safety and quality problems have become increasingly prominent. Among them, the fire problem is the biggest safety hazard of energy storage power station. Once arc occurs on the direct current side of the system, there is a high probability of fire, but there are few effective prevention designs for this phenomenon on the market. The current market designs of direct current protection measures are to increase fuses, direct current circuit breakers and direct current contactors in high-voltage boxes. Direct current contactors and circuit breakers are pure mechanical control breakers, which rely on the magnetic field generated by the current flowing through the conductive loop to lengthen the arc for arc extinction. They are only single cluster and cannot predict the occurrence of arc, so they are relatively passive for the safety of energy storage systems. SUMMARY
[0004] In view of the problems existing in the prior art, the utility model provides an energy storage system with arc detection function between battery clusters, aiming to solve the problem of inability to predict arc in battery clusters.
[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of: 1. An energy storage system with arc detection function between battery clusters, the energy storage system is connected to a power grid and comprises an energy storage converter and a plurality of energy storage battery cabinets, characterized in that: one end of the energy storage converter is connected to the power grid, and the other end is connected to a plurality of energy storage battery cabinets; an arc detection device is connected at the connection between each energy storage battery cabinet and the energy storage converter; and the arc detection device is connected to an electric control system (ECS).
[0006] The arc detection device comprises an arc detection circuit and a circuit breaker. The arc detection circuit comprises a main circuit, a current transformer, an operational amplifier, a leakage detector and a microcontroller. The circuit breaker is arranged on the main circuit. The current transformer is connected to the main circuit. The input end of the operational amplifier is connected to the output end of the current transformer. The output end of the operational amplifier is connected to the ADC pin of the microcontroller. The signal input end and the signal output end of the leakage detector are respectively connected to the main circuit and the microcontroller. The output end of the microcontroller is connected to the electric control system. The output end of the electric control system is connected to the circuit breaker.
[0007] Based on the above, the energy storage battery cabinet is connected with the arc detection device at the connection of the energy storage converter, the arc detection device can monitor the current of each branch, the bus voltage and whether harmful arc exists in the DC circuit in real time, once the harmful arc is detected, the power control system will transmit an alarm signal, and the power control system will take measures to cut off the fault circuit after receiving the alarm signal, which can effectively prevent the fire and other safety hazards caused by the arc, compared with the conventional mechanical control circuit breaker segmentation mode, the harmful arc can be accurately detected, and the harmful arc can be further analyzed and judged, the accident can be predicted and measures can be taken to avoid safety accidents, and the economic loss caused by the accident is reduced, the current transformer can convert the large current in the circuit into a small current, and damage to the detection device caused by the large current is avoided, and the protection effect is achieved. The converted current signal is transmitted to the operational amplifier for signal amplification, and the operational amplifier transmits the amplified signal to the micro control system, and the leakage detector also transmits the fluctuation signal of the main circuit to the micro control system, the micro control system analyzes and judges the received data, and transmits the judgment result to the power control system, and the power control system makes corresponding processing according to the judgment result.
[0008] Further, the energy storage battery cabinet comprises a high-voltage box and a battery cluster, the battery cluster is connected with the high-voltage box, and the high-voltage box is provided with a high-voltage circuit breaker.
[0009] Based on the above, when the harmful arc appears in the battery cabinet, the circuit breaker is disconnected.
[0010] In order to make the above features of the utility model and the purposes to be achieved more clearly, the utility model will be further described in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS
[0011] Fig. 1 : it is circuit principle diagram of the utility model;
[0012] Fig. 2 : it is circuit principle diagram of arc detection circuit.
[0013] BRIEF DESCRIPTION OF DRAWINGS 1 power transmission network;2 energy storage converter;3 energy storage battery cabinet;4 arc detection device;5 arc detection circuit;6 circuit breaker;7 main circuit;8 current transformer;9 operational amplifier;10 leakage detector;11 microcontroller;12 high-voltage box;13 battery cluster. DETAILED DESCRIPTION
[0014] As Figs. 1-2As shown, a battery cluster has a pull arc detection function of energy storage system, the embodiment is 500kw energy storage system, it includes power grid 1, energy storage converter 2 and energy storage battery cabinet 3, one end of the energy storage converter 1 is connected with the power grid 1, the other end is connected with five energy storage battery cabinets 3, the electric quantity of five energy storage battery cabinets 3 is 215kwh, each energy storage battery cabinet 3 is connected with the connecting place of the energy storage converter 2 and is connected with pull arc detection device 4, the pull arc detection device 4 is connected with power control system ECS, the power control system ECS includes electric energy management system EMS and battery management system BMS.
[0015] The pull arc detection device 4 includes arc detection circuit 5 and circuit breaker 6, the arc detection circuit 5 includes main circuit 7, current transformer 8, operational amplifier 9, leakage detector 10 and microcontroller 11, the circuit breaker 6 is arranged on the main circuit 7, the current transformer 8 is connected with the main circuit 7, the input end of the operational amplifier 9 is connected with the output end of the current transformer 8, the output end of the operational amplifier 9 is connected with the ADC pin of the microcontroller 11, the signal input end and signal output end of the leakage detector 10 are connected with the main circuit 7 and microcontroller 11 respectively, the output end of the microcontroller 11 is connected with the power control system ECS, and the output end of the power control system ECS is connected with the circuit breaker 6.
[0016] The energy storage battery cabinet 3 includes high-voltage box 12 and battery cluster 13, the battery cluster 13 is connected with the high-voltage box 12, and the high-voltage box 12 is provided with high-voltage circuit breaker K1.
[0017] The specific embodiment of the embodiment is that during the operation of the energy storage system, the pull arc detection device 4 monitors the current of each branch in the direct current system, the bus voltage and whether harmful arc exists in the direct current circuit in real time, once the harmful arc is detected, the power control system ECS will be transmitted alarm signal, the power control system ECS receives the alarm signal and will take measures to cut off the fault loop, effectively prevent the fire and other safety hazards caused by arc.
[0018] The specific monitoring process is that the current transformer 8 converts the large current in the circuit into a small current to avoid damage to the detection device caused by the large current, the converted current signal is transmitted to the operational amplifier 9 for signal amplification, the operational amplifier 9 further transmits the amplified signal to the microcontroller 11, at the same time, the leakage detector 10 also transmits the fluctuation signal of the main circuit 7 to the microcontroller 11, the microcontroller 11 analyzes and judges the received data, and transmits the judgment result to the electric power control system ECS, the electric power control system ECS makes corresponding processing according to the judgment result, if harmful arc is found, the microcontroller 11 transmits information to the electric energy management system EMS, when the electric energy management system EMS receives the signal, the trip device on the direct current circuit breaker 6 is controlled by the battery management system BMS to cut off the fault circuit, effectively preventing the fire and other safety hazards caused by the arc.
[0019] The above only describes the optimal solution embodiment of the present application, and is not used to limit the present application. Various modifications or replacements of the present application made by those skilled in the art without departing from the essence and protection scope of the present application should be within the protection scope of the present application.
Claims
1. An energy storage system with arc detection function between battery clusters, the energy storage system being connected to a power transmission network (1), and including an energy storage converter (2) and several energy storage battery cabinets (3), characterized in that: One end of the energy storage converter (2) is connected to the power transmission network (1), and the other end is connected to several energy storage battery cabinets (3). Each energy storage battery cabinet (3) is connected to the connection point of the energy storage converter (2) with an arcing detection device (4). The arcing detection device (4) is connected to the power control system (ECS). The arc detection device (4) includes an arc detection circuit (5) and a circuit breaker (6). The arc detection circuit (5) includes a main circuit (7), a current transformer (8), an operational amplifier (9), a leakage current detector (10), and a microcontroller (11). The circuit breaker (6) is installed on the main circuit (7). The current transformer (8) is connected to the main circuit (7). The input terminal of the operational amplifier (9) is connected to the output terminal of the current transformer (8). The output terminal of the operational amplifier (9) is connected to the ADC pin of the microcontroller (11). The signal input terminal and signal output terminal of the leakage current detector (10) are connected to the main circuit (7) and the microcontroller (11), respectively. The output terminal of the microcontroller (11) is connected to the power control system. The output terminal of the power control system is connected to the circuit breaker (6).
2. The energy storage system with arc detection function between battery clusters according to claim 1, characterized in that: The energy storage battery cabinet (3) includes a high-voltage box (12) and a battery cluster (13). The battery cluster (13) is connected to the high-voltage box (12). A high-voltage circuit breaker (K1) is installed inside the high-voltage box (12).