| 引用本文: | 郑 涛,孟令昆,强雨泽,等.计及SOC影响的电化学储能系统低电压穿越控制策略[J].电力系统保护与控制,2024,52(13):171-178.[点击复制] |
| ZHENG Tao,MENG Lingkun,QIANG Yuze,et al.Low voltage ride-through control strategy for electrochemical energy storagesystems taking account of SOC effects[J].Power System Protection and Control,2024,52(13):171-178[点击复制] |
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| 摘要: |
| 针对电化学储能现有低电压穿越控制策略未计及荷电状态(state of charge, SOC)动态特性导致其在低SOC场景下出现过放这一问题，设计并引入自适应调节系数来表征低电压穿越期间SOC对储能单元输出有功电流的影响，进而提出一种计及SOC动态特性与充放电状态的电化学储能系统低电压穿越控制策略。该控制策略基于并网规范的电压和频率要求，结合工程实际应用对自适应调节系数进行定量设计，使得系统故障期间储能单元输出的有功电流能够根据SOC大小动态调整。仿真结果表明，该控制策略在低SOC场景下能够有效限制有功电流输出，减缓放电速度，从而避免小容量、大放电倍率储能单元出现因SOC越限而退出运行的风险，并减小低电压穿越过程中多个储能单元之间的SOC极差。通过与传统的低电压穿越策略对比验证了所提策略的有效性。 |
| 关键词: 电化学储能 荷电状态 低电压穿越策略 自适应调节系数 |
| DOI：10.19783/j.cnki.pspc.231671 |
| 投稿时间：2023-12-29修订日期：2024-05-07 |
| 基金项目:国家电网有限公司科技项目资助“电化学储能电站接入系统继电保护关键技术研究”(SGTYHT/21- JS-223) |
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| Low voltage ride-through control strategy for electrochemical energy storagesystems taking account of SOC effects |
| ZHENG Tao1,MENG Lingkun1,QIANG Yuze1,MA Ying1,CAO Hong2,YU Yue2 |
| (1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power
University), Beijing 102206, China; 2. China Electric Power Research Institute, Beijing 100192, China) |
| Abstract: |
| Existing low voltage ride-through (LVRT) control strategies for electrochemical energy storage do not take into account the dynamic characteristics of state of charge (SOC). This leads to over-discharge in low SOC scenarios. Thus this paper designs and introduces an adaptive regulation coefficient to characterize the effect of SOC on the output active current of the storage unit during the LVRT period. Then an LVRT control strategy for the electrochemical energy storage system is proposed by taking into account the dynamic characteristics of the SOC and the charging/discharging state. The control strategy is based on the voltage and frequency requirements of the grid-connected specification, and the adaptive regulation coefficients are quantitatively designed in combination with practical engineering applications, so that the active current output from the storage unit can be dynamically adjusted according to the SOC during a system fault. Simulation results show that this control strategy can effectively limit the active current output and slow down the discharge rate in low SOC scenarios, thus avoiding the risk of small-capacity and large-discharge-multiplication energy storage units quitting the operation because of SOC overrun, and reducing the SOC polarity difference between multiple energy storage units in the process of LVRT. The effectiveness of the proposed strategy is verified by comparing it with the conventional LVRT strategy. |
| Key words: electrochemical energy storage state of charge low voltage ride through adaptive regulation coefficient |
