摘要
近些年来,基于柔性成组技术的电池柔性成组储能系统因其输出谐波小、模块化程度高、电池容量利用率高,在新能源发电领域得到广泛关注;与此同时,由于储能系统功率等级高,模块间荷电状态不均衡,系统故障概率相应增大,故障情况复杂。该文提出3种适用于不同故障情况的冗余控制策略,通过故障后改变基波相角或注入3次谐波的方式重构三相调制波,维持故障后系统正常工作,提高了电池利用率,避免直接停机带来的容量损失。对所提出的3种故障冗余控制策略进行比较,得出特定故障情况下的最佳控制策略,最大程度提高故障后系统能量利用率。最后通过仿真模型和10kW样机平台验证了所提出理论的正确性和有效性。
Recently the flexible group battery energy storage system(FGBESS) has provoked much attention in renewable energy power generation area because of its particular advantages such as low output harmonics, high modularity and high battery capacity utilization. However,owing to high power rating and state of charge(SoC) inconsistency of batteries, the probability and complexity of fault conditions increase correspondingly. In this paper, three fault-tolerant control strategies were proposed for different fault situations. The three-phase modulating signals were modified by shifting the fundamental phase angle or injecting the third harmonic to keep the system working continuously after the fault, improving the battery utilization and minimizing the loss of capacity caused by the direct shutdown. Comparison of the proposed strategies was illustrated specifically and the optimal solution was elaborated under each fault condition.Finally, the correctness and effectiveness of the proposed methods were verified by the simulation model and the 10kW experimental platform.
引文
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