CN-122025701-A - Flow battery module operation stability control system

Abstract

The invention belongs to the technical field of energy storage of flow batteries, and discloses a flow battery module operation stability control system. The battery system comprises a BMS battery system and EMS, SACADA, PCS connected with the BMS battery system, wherein the BMS battery system comprises a battery master control unit, a battery cluster control unit and a collecting unit, the battery cluster control unit is electrically connected with a liquid path, and the collecting unit is electrically connected with a galvanic pile. According to the invention, through multi-sensor data fusion, a self-adaptive control algorithm and a multi-stage fault response mechanism, the full-working-condition stable operation of the flow battery module is realized.

Inventors

• WANG HAO
• LEI XIANDAO
• WEI XUEWEN
• MA ZONGREN
• WANG HUI
• DENG FUBIN
• ZHANG YUE
• LIU JIE
• ZHOU HOUJUN

Assignees

• 三峡新能源吉木萨尔发电有限公司

Dates

Publication Date

20260512

Application Date

20260116

Claims (10)

1. 1. The flow battery module operation stability control system is characterized by comprising a BMS battery system and EMS, SACADA, PCS connected with the BMS battery system, wherein the BMS battery system comprises a battery master control unit, a battery cluster control unit and an acquisition unit, the battery cluster control unit is electrically connected with a liquid circuit, and the acquisition unit is electrically connected with a galvanic pile.
2. 2. The flow battery module operational stability control system of claim 1, wherein the collection unit, the battery cluster control, and the battery master control in the BMS battery system are electrically connected in sequence step by step.
3. 3. The flow battery module operation stability control system of claim 2, wherein the battery master control comprises a PLC, an HMI, a frame breaker, a switch and a gateway, the battery cluster control comprises an MCU master control board, a digital quantity expansion board, an analog quantity expansion board and a frequency converter, and the acquisition unit comprises a voltage board.
4. 4. The flow battery module operation stability control system of claim 3, wherein the PLC controls the MCU main control board to collect data information of the galvanic pile and the liquid path.
5. 5. The flow battery module operational stability control system of claim 3, wherein the HMI is communicatively coupled to the PLC to display battery system data.
6. 6. The flow battery module operational stability control system of claim 3, wherein the PLC communicates with the battery cluster control and acquisition unit via a switch for data exchange.
7. 7. The flow battery module operational stability control system of claim 3, wherein the BMS battery system uploads data to EMS, SACADA, PCS via a gateway.
8. 8. The flow battery module operation stability control system according to claim 3, wherein the MCU main control board is in communication connection with the digital quantity expansion board and the analog quantity expansion board, and is used for collecting relevant data of the positive electrolyte storage tank and the negative electrolyte storage tank in the liquid path.
9. 9. The flow battery module operational stability control system of claim 3, wherein the frequency converter adjusts an operational speed of an electrolyte circulation pump in the fluid path.
10. 10. The flow battery module operational stability control system of claim 3, wherein the pressure plate collects data in the stack including voltage, leakage signal of the power bin, temperature signal, pressure signal, gas concentration signal.

Description

Flow battery module operation stability control system Technical Field The invention belongs to the technical field of energy storage of flow batteries, and particularly relates to a flow battery module operation stability control system. Background As a large-scale energy storage core device, the running stability of the flow battery is obviously influenced by coupling of electrical control parameters (voltage and current) and physical parameters (temperature, pressure and flow). The existing system has the following technical bottlenecks: 1. Temperature fluctuation induced performance decay The temperature difference inside the flow battery pile can reach more than 15 ℃, so that the viscosity of the electrolyte is changed (+ -20%), the ion transmission efficiency is reduced (reduced by 30%), and the corrosion of electrode materials is accelerated. For example, all-vanadium flow batteries are prone to precipitation of vanadium ions at low temperatures (< 5 ℃) and sudden drop in V 5+ stability at high temperatures (> 45 ℃). 2. Pressure imbalance causes system failure The fluctuation of the circulating pipeline pressure (+ -0.2 MPa) can cause electrolyte leakage, and the traditional pressure control depends on single threshold judgment, and the fault response time is more than 100ms. For example, when the water pump idles or the pipeline is blocked, the pressure abnormality cannot be timely identified, and the electric pile is locally dried. 3. Local overheating caused by uneven flow Uneven flow distribution of electrolyte can cause local severe reaction of the galvanic pile and accelerate aging of electrode materials. Conventional flow control relies on empirical parameters and cannot dynamically match load variations. 4. Failure early warning and health management missing The existing system lacks multisource data fusion analysis capability, and potential faults (such as weak pressure change (< 0.05 MPa) in the early stage of electrolyte leakage) are difficult to identify in advance, so that the maintenance cost is high and the shutdown risk is high. The patent with the publication number of CN104201407A discloses a flow battery system control system and a flow battery system based on DCS, wherein the control system comprises an acquisition system connected with at least one flow battery system and used for acquiring operation parameters of the flow battery system, and an on-site monitoring system connected with the acquisition system and at least one flow battery system and used for correspondingly controlling the operation state of the flow battery system according to a control instruction issued by the on-site monitoring system. And judging whether the operation parameters acquired by the acquisition system are abnormal or not according to preset judgment conditions, and correspondingly adjusting the operation state of the flow battery system according to the operation parameter change. The invention is based on DCS control technology, the maximum number of accessible nodes is far higher than that of the control system based on PLC or singlechip in the prior art, the data processing capacity and the control capacity are improved, and the stable operation and the reliability of the control system and the flow battery system are ensured through a redundant structure. However, the patent does not design an adaptive control algorithm for different situations and does not have a multi-stage fault response effect. The patent with publication number CN108627768A discloses an on-line detection method for SOC of an all-vanadium redox flow battery system, wherein a porous medium is arranged in a pipeline system, the viscosity of electrolyte passing through the porous medium is calculated by measuring the pressure difference at two sides of the porous medium and the volume flow value passing through the porous medium in real time, and then a black box model is fitted by using data of the SOC obtained offline and the viscosity and temperature of the electrolyte, and the value of SOC is calculated in real time by using the value of the temperature of the electrolyte of the porous medium. Aiming at the real-time online SOC detection requirement of the all-vanadium redox flow battery system, the viscosity value of the electrolyte is obtained by utilizing Darcy's law through online measurement of pressure difference and flow rate at two sides of a porous medium arranged in a pipeline, and further, the online calculation and prediction of the SOC of the all-vanadium redox flow battery system are realized through a pre-fitted data model of the SOC, temperature and viscosity and a real-time electrolyte temperature measured value, and the SOC detection result can be displayed in real time through a battery control system. The invention fully utilizes the necessary sensors and acquisition data in the operation of the all-vanadium redox flow battery system, realizes the on-line detection of the SOC without introducing compli