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复杂多端柔性直流电网源网限流设备协同优化配置
梅军, 陈萧宇, 朱鹏飞, 严凌霄, 张丙天
东南大学 电气工程学院,江苏 南京 210096
摘要:
利用源网限流设备协同优化配置解决复杂多端柔性直流电网的故障电流抑制难题,成为相关领域的研究热点。首先,结合模块化多电平换流器(MMC)与电网的耦合程度,提出适用于复杂多端柔性直流电网的区域划分原则,以提高多端柔性直流电网限流设备参数优化的计算效率;然后,根据各区域的限流需求,结合MMC、直流变压器、限流电抗器及故障限流器等关键源网设备的限流机理,提出各区域典型限流设备的配置方案;在此基础上,对不同区域限流设备参数进行分级优化;最后,基于PSCAD/EMTDC平台搭建六端直流电网,结合具体故障限流器拓扑,仿真验证所提源网限流设备参数分级优化方法的有效性。仿真结果表明,所提方法能够实现源网设备协同限流,减轻网侧设备的限流压力,同时提高设备参数优化的计算效率。
关键词:  模块化多电平换流器  限流设备  区域划分  分级优化  协同优化配置  多端柔性直流电网
DOI:10.16081/j.epae.202202002
分类号:TM721.1;TM762
基金项目:国家自然科学基金资助项目(52077037)
Collaborative optimal configuration of current limiting devices at source and network sides in complex multi-terminal flexible DC power grid
MEI Jun, CHEN Xiaoyu, ZHU Pengfei, YAN Lingxiao, ZHANG Bingtian
School of Electrical Engineering, Southeast University, Nanjing 210096, China
Abstract:
To solve the problem of fault current suppression in complex multi-terminal flexible DC power grid by using the collaborative optimal configuration of current limiting devices at source and network sides has become a research hotspot in related fields. Firstly, according to the coupling degree of MMC(Modular Multi-level Converter) and power grid, the regional division principle suitable for complex multi-terminal flexible DC power grid is proposed to improve the calculation efficiency of parameter optimization of current limiting devices in the multi-terminal flexible DC power grid. Then, according to the current limi-ting requirements of each region, combined with the current limiting mechanism of key devices at source and network sides, such as MMC, DC transformer, current limiting reactor, fault current limiter, and so on, the typical configuration schemes of current limiting devices in each region are proposed. On this basis, the parameters of current limiting devices in different areas are hierarchically optimized. Finally, a six-terminal DC power grid is built based on PSCAD/EMTDC platform, and combined with the specific topology structures of fault current limiter, the effectiveness of the proposed hierarchical optimization method for current limiting device parameters at source and network sides is verified. The simulative results show that the proposed method can realize the collaborative current limiting of devices at source and network sides, reduce the current limiting pressure of devices at network side, and improve the calculation efficiency of device parameter optimization.
Key words:  modular multi-level converter  current limiting devices  regional division  hierarchical optimization  collaborative optimal configuration  multi-terminal flexible DC power grid

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