许凌,赵乐,张啸虎,郭瀚临,张哲任,徐政
XU Ling,ZHAO Le,ZHANG Xiaohu,GUO Hanlin,ZHANG Zheren,XU Zheng

• 1:国家电网有限公司华东分部
• 2:浙江大学电气工程学院

摘要(Abstract)：

模块化多电平直流变压器是全直流系统中的关键设备，直流故障隔离是全直流系统运行时必须解决的关键技术问题。为此，提出一种基于高压直流变压器的新型直流故障电流主动抑制控制策略，通过协调故障侧与非故障侧模块化多电平换流器的运行状态来提升限流性能。该策略包含3个阶段：快速启动阶段、故障路径子模块深度降压阶段以及重合闸快速恢复准备阶段，详细分析了第二阶段控制参数对高压直流变压器交流电压和子模块电容的影响。最后，在电磁暂态仿真软件PSCAD/EMTDC中搭建了仿真算例，仿真结果表明该策略在优化限流性能的同时，可避免装置内部承受过高的电压电流应力，验证了所提策略的有效性。
The modular multilevel DC transformer(MMDCT) serves as critical equipment in the all-DC systems, where DC fault isolation represents a key technical challenge that must be addressed during system operation. To this end, this paper proposes a novel active DC fault current suppression control strategy based on the high-voltage DC transformers. By coordinating the operational states of modular multilevel converters on both the fault and nonfault sides, the strategy significantly enhances the current-limiting performance. The proposed strategy comprises three stages: rapid activation, deep voltage reduction of submodules in the fault current path, and fast recovery preparation after reclosing. The influence of control parameters in the second stage on the AC voltage and submodule capacitors of the high-voltage DC transformer is analyzed. Finally, simulation cases built in the electromagnetic transient simulation software PSCAD/EMTDC demonstrate that the strategy optimizes current-limiting performance while avoiding excessive voltage and current stress on internal components, thereby validating its effectiveness.

关键词(KeyWords)： 故障电流抑制;模块化多电平直流变压器;全直流光伏电站;直流断路器
fault current suppression;MMDCT;all-DC photovoltaic power plant;DC circuit breaker

Abstract:

Keywords:

基金项目(Foundation): 国家电网有限公司华东分部科技项目(52992424001N)

作者(Author): 许凌,赵乐,张啸虎,郭瀚临,张哲任,徐政
XU Ling,ZHAO Le,ZHANG Xiaohu,GUO Hanlin,ZHANG Zheren,XU Zheng

DOI: 10.19585/j.zjdl.202511011

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