杨淇鸾,肖晃庆,朱琼海
YANG Qiluan,XIAO Huangqing,ZHU Qionghai

• 1:华南理工大学电力学院

摘要(Abstract)：

基于MMC（模块化多电平换流器）的SCES（超级电容储能系统）是解决大规模可再生能源并网问题的关键技术之一，但超级电容的差异性将导致SOC（荷电状态）不一致，从而影响储能容量利用率。针对此问题，提出一种基于电容电压平衡的MMC-SCES荷电状态均衡控制方法，通过储能功率的改变和子模块电容电压平衡实现各级SOC均衡。在PSCAD/EMTDC中搭建双端输电系统验证所提控制策略的可行性和有效性。结果表明：所提出的SOC均衡策略大幅减少了控制器的数量，简化了控制系统；采用状态排序与增量投切的电容电压平衡控制策略可以在SOC均衡的同时有效减少IGBT开关次数，降低了开关损耗。
The super capacitor energy storage(SCES) system based on modular multilevel converter(MMC) is one of the key technologies for addressing issues with the grid integration of large-scale renewable energy. However, differences in supercapacitors can lead to inconsistencies in state of charge(SOC), thereby affecting the utilization rate of energy storage capacity. In response to this issue, the paper proposes a SOC equilibrium control method for MMC-SCES based on capacitor voltage balancing. This balance is achieved by altering the energy storage power and equalizing the submodule capacitor voltage for all levels of SOC. The feasibility and effectiveness of the proposed control strategy are verified in a bipolar transmission system built in PSCAD/EMTDC. The results indicate that the proposed SOC equilibrium control strategy significantly reduces the number of controllers and simplifies the control system. The capacitor voltage balancing control strategy, which uses state sequencing and increment switching can effectively reduce the number of IGBT switch operations whilst balancing SOC, thus reducing switch loss.

关键词(KeyWords)： 模块化多电平换流器;超级电容储能;荷电状态均衡;双向DC/DC变换器;子模块电容电压平衡
MMC;SCES;SOC equilibrium;bidirectional DC/DC converter;submodule capacitor voltage balancing

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金（U1766213）;; 广东省基础与应用基础研究基金（2023A1515111125）

作者(Author): 杨淇鸾,肖晃庆,朱琼海
YANG Qiluan,XIAO Huangqing,ZHU Qionghai

DOI: 10.19585/j.zjdl.202411005

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