Scholarlink

Under unbalanced grid fault, the DC current in a grid-connected inverter with multi-variable protection control exhibits second-harmonic fluctuations, leading to inaccuracies in battery SOC prediction. To improve SOC estimation accuracy, an indirect prediction algorithm is proposed. This approach introduces the multi-variable protection control strategy. Subsequently, the method’s effect on DC bus voltage and battery current is quantitatively analyzed, correlating control parameters with current dynamics. A theoretical model is derived to compute the actual battery current, and SOC is estimated via ampere-hour integration, providing a reliable reference for online correction. Simulation results validate the effectiveness the proposed method.

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

SOC Indirect Prediction Algorithm of Energy Storage System Under Grid Unbalanced Fault

  • 会议论文

  • 发表日期：

    2026年

查看全文
  • Minglin Zhu,
  • Jingyi Qiu,
  • Xiayu Zhu

摘要

Under unbalanced grid fault, the DC current in a grid-connected inverter with multi-variable protection control exhibits second-harmonic fluctuations, leading to inaccuracies in battery SOC prediction. To improve SOC estimation accuracy, an indirect prediction algorithm is proposed. This approach introduces the multi-variable protection control strategy. Subsequently, the method’s effect on DC bus voltage and battery current is quantitatively analyzed, correlating control parameters with current dynamics. A theoretical model is derived to compute the actual battery current, and SOC is estimated via ampere-hour integration, providing a reliable reference for online correction. Simulation results validate the effectiveness the proposed method.