CN-121559342-B - Arc discharge detection method, program product and computer equipment of stacked energy storage system

Abstract

The invention provides an arc discharge detection method, a program product and computer equipment of a stacked energy storage system. The stacked energy storage system comprises a battery cluster and an inverter connected with the battery cluster, wherein the battery cluster is formed by stacking a plurality of energy storage battery packs in parallel, and the arc discharge detection method comprises the steps of splitting the battery cluster into serial loops formed by single energy storage battery packs and the inverter one by one; and disconnecting the energy storage battery packs with arc discharge faults, so that the rest energy storage battery packs without faults are in a parallel operation state. The arc discharge detection method can be suitable for parallel stacked energy storage systems, realizes accurate positioning of the arc discharge fault battery pack, and reduces hardware cost and system complexity of a detection scheme.

Inventors

• ZHOU YUHAO
• ZHU ZHIXUAN
• ZHOU YI

Assignees

• 青岛海尔新能源科技有限公司

Dates

Publication Date

20260508

Application Date

20260122

Claims (8)

1. 1. An arc discharge detection method of a stacked energy storage system including a battery cluster and an inverter connected to the battery cluster, and the battery cluster is formed by stacking a plurality of energy storage battery packs in parallel, the arc discharge detection method comprising: splitting the battery clusters one by one into a series loop formed by a single energy storage battery pack and the inverter; arc discharge detection is carried out on each series circuit respectively so as to determine the energy storage battery pack with arc discharge faults; disconnecting the energy storage battery pack with arc discharge faults, and enabling the rest energy storage battery packs without faults to be in a parallel operation state; The battery cluster also comprises a switch assembly, wherein the switch assembly comprises an anode switch configured at the anode of each energy storage battery pack, a cathode switch configured at the cathode of each energy storage battery pack, and a branch switch connected between the anodes of two adjacent energy storage battery packs and between the cathodes of two adjacent energy storage battery packs, and The step of splitting the battery clusters one by one into a series loop formed by a single energy storage battery pack and the inverter comprises the following steps: Controlling the on-off states of the positive electrode switches, the negative electrode switches and the branch switches to enable the energy storage battery packs to form a series loop with the inverter in sequence; after the step of disconnecting the energy storage battery pack in which the arcing fault occurs, further comprising: Generating a preventive risk assessment model of the same batch of energy storage battery packs based on the historical detection data of the energy storage battery packs with arc discharge faults, and judging risk grades of the rest energy storage battery packs of the same batch without faults in the battery cluster through the risk assessment model; If the similarity between the voltage and current parameters of a certain fault-free energy storage battery pack and the voltage and current parameters of the fault energy storage battery pack before the arc discharge fault occurs reaches a preset threshold, marking the fault-free energy storage battery pack as a risk early warning battery pack, and adjusting the upper limit of the charge and discharge multiplying power of the fault-free energy storage battery pack according to a preset proportion.
2. 2. The method of claim 1, further comprising, prior to the step of splitting the battery clusters one by one into a series loop formed by a single energy storage battery pack and the inverter: controlling each energy storage battery pack in the battery cluster to be in a parallel operation state; detecting a voltage reference value of the battery cluster, and comparing the detected voltage reference value with a preset voltage expected value; and if the comparison results are not matched, the step of splitting the battery clusters into serial loops formed by the single energy storage battery pack and the inverter one by one is executed.
3. 3. The method of claim 1, wherein the inverter includes a arcing sampling circuit for separately detecting arcing for each of the series loops to determine the energy storage battery pack experiencing arcing faults, comprising: collecting voltage and current parameters of a current series loop by using the arc discharge sampling circuit; comparing the acquired voltage and current parameters with a preset limit value range; And if the voltage and current parameters exceed the limit value range, determining that the energy storage battery pack corresponding to the current series loop is an energy storage battery pack with an arc discharge fault.
4. 4. The method of claim 3, wherein the voltage and current parameters include a voltage ramp waveform feature, a current high frequency pulse feature, and an abnormal harmonic component feature, wherein the voltage ramp waveform feature includes a ramp magnitude and a duration, the current high frequency pulse feature includes a pulse frequency and a pulse intensity, and the abnormal harmonic component feature includes a harmonic distortion rate and a characteristic band energy duty cycle.
5. 5. The method of claim 1, further comprising, after the step of separately performing arc discharge detection for each of the series circuits to determine the energy storage battery pack that has failed in arc discharge: Counting the number of the energy storage battery packs with arc discharge faults, and judging whether the total capacity of the remaining energy storage battery packs without faults meets the preset charge and discharge power requirements; If yes, the step of disconnecting the energy storage battery pack with the arc discharge fault and enabling the rest energy storage battery packs without faults to be in a parallel operation state is executed.
6. 6. The method for detecting arc discharge of stacked energy storage systems of claim 5, further comprising, after the step of counting the number of said energy storage battery packs having an arc discharge failure and determining whether the total capacity of the remaining non-failed energy storage battery packs meets a preset charge-discharge power requirement: And outputting arc discharge prompt information, wherein the arc discharge prompt information at least comprises the number and the position of the energy storage battery packs with arc discharge faults and the total capacity of the remaining energy storage battery packs without faults.
7. 7. A computer program product comprising a computer program, characterized in that the computer program, when executed by a processor, implements the steps of the arc pull detection method of a stacked energy storage system of any one of claims 1 to 6.
8. 8. A computer device comprising a memory, a processor and a computer program stored on the memory, characterized in that the processor executes the computer program to implement the steps of the arc runner detection method of a stacked energy storage system of any of claims 1 to 6.

Description

Arc discharge detection method, program product and computer equipment of stacked energy storage system Technical Field The present invention relates to the field of energy storage, and in particular, to a method for detecting arc discharge of a stacked energy storage system, a program product, and a computer device. Background In the field of new energy storage, the stacked energy storage system is widely applied to the scenes of power grid peak shaving, industrial and commercial energy storage and the like by virtue of the advantages of expandable capacity and high power density. The core unit battery cluster is formed by combining a plurality of energy storage battery packs through parallel topology, and is connected to a power grid or a load side after the conversion of alternating current and direct current electric energy is completed through an inverter. The parallel stacking topology brings the technical problem of arc discharge fault detection while improving the capacity. On one hand, the parallel arc-discharge fault characteristics are not obvious due to factors such as blind plug interface tolerance, insulation aging, outdoor humidity fluctuation and the like of the battery pack, and on the other hand, the current sharing characteristic of the parallel topology can weaken fault current, and an arc signal is also easily interfered by charge and discharge ripples, so that the traditional current threshold detection method is completely invalid. The existing arc discharge detection scheme has the obvious defects that the cluster-level integral detection can only judge whether a battery cluster is in arc discharge or not, a specific fault battery pack cannot be positioned, fault signals are easy to dilute and interfere, detection accuracy is low, and the branch current monitoring scheme can realize branch monitoring, but needs to configure an independent sensing and communication module for each battery pack, so that hardware cost and wiring complexity are greatly increased, a large amount of calculation force resources are occupied, and system integration and miniaturization are not facilitated. Disclosure of Invention The invention aims to provide an arc discharge detection method suitable for a parallel stacked energy storage system, which realizes accurate positioning of an arc discharge fault battery pack and reduces hardware cost and system complexity of a detection scheme. The invention further aims to improve the detection precision of the arc discharge faults, realize the detection function by relying on the original arc discharge sampling circuit of the inverter and reduce the detection cost. Another further object of the invention is to achieve preventive risk management of the same batch of energy storage battery packs, significantly improving the long-term operational safety of the energy storage system. It is still a further object of the present invention to achieve synergistic compromise between fault battery pack removal and system power output, ensuring stable operation of the energy storage system after fault isolation. In particular, according to a first aspect of the present invention, there is provided a method of detecting arcing of a stacked energy storage system including a battery cluster and an inverter connected to the battery cluster, and the battery cluster is formed by stacking a plurality of energy storage battery packs in parallel, the method comprising: splitting the battery clusters into serial loops formed by a single energy storage battery pack and an inverter one by one; arc discharge detection is carried out on each series loop respectively so as to determine an energy storage battery pack with arc discharge faults; And disconnecting the energy storage battery packs with arc discharge faults, so that the rest energy storage battery packs without faults are in a parallel operation state. Optionally, before the step of splitting the battery clusters one by one into serial loops formed by the single energy storage battery pack and the inverter, the method further comprises: controlling each energy storage battery pack in the battery cluster to be in a parallel operation state; detecting a voltage reference value of the battery cluster, and comparing the detected voltage reference value with a preset voltage expected value; And if the comparison results are not matched, executing the step of splitting the battery clusters into serial loops formed by the single energy storage battery pack and the inverter one by one. Optionally, the battery cluster further comprises a switch assembly, wherein the switch assembly comprises a positive electrode switch arranged at the positive electrode of each energy storage battery pack, a negative electrode switch arranged at the negative electrode of each energy storage battery pack, and a branch switch connected between the positive electrodes of two adjacent energy storage battery packs and between the negative electrodes of two