In this paper, a new configuration of ultracapacitor (UC)‐based energy storage system is proposed aiming applications at higher power level. The configuration can provide active and reactive power support together. The UC is chosen due to its longer life cycle and fast transient response. The UCs are integrated at the DC link of a modular multilevel converter (MMC) through distributed DC‐DC converters. This configuration possesses better features in terms of power quality, modularity, redundancy, and efficiency compared with conventional two‐/three‐level topologies. The integration of ultracapacitors with the MMC and associated control related issues is discussed in this paper. An algorithm to balance the state of charge among the distributed energy storage modules is also proposed. The performance of the proposed system and the associated control methods are verified for a wind energy generation system using PSCAD/EMTDC simulation and the results show satisfactory performance.

中文翻译：

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直流链路上基于分布式超级电容器的储能系统的模块化多级STATCOM的控制和电量平衡算法

在本文中，针对更高功率水平的应用，提出了一种基于超级电容器（UC）的储能系统的新配置。该配置可以一起提供有功和无功功率支持。之所以选择UC，是因为它具有更长的生命周期和快速的瞬态响应。UC通过分布式DC-DC转换器集成在模块化多级转换器（MMC）的DC链路上。与传统的两级/三级拓扑相比，此配置在电源质量，模块化，冗余性和效率方面具有更好的功能。本文讨论了超级电容器与MMC的集成以及与控制相关的问题。还提出了一种在分布式储能模块之间平衡充电状态的算法。