祝万,任祖怡,何育钦,赵青春,戴光武,白杨,夏尚学,徐柯
ZHU Wan,REN Zuyi,HE Yuqin,ZHAO Qingchun,DAI Guangwu,BAI Yang,XIA Shangxue,XU Ke

• 1:南京南瑞继保电气有限公司
• 2:国网浙江省电力有限公司衢州供电公司

摘要(Abstract)：

为保障柔性直流电网安全稳定运行，需要配套建设稳定控制系统，完善、有效的控制策略是实施该系统的关键。分析柔性直流电网各换流阀控制模式特点及拓扑关系，定义直流电网输电能力和送端单站输电能力，并提出对应的计算方法。利用故障前直流电网输送功率与实时输电能力的差值，分别计算故障状态下直流电网和送端单站的盈余功率；从依据故障前电源出力切除电源和依据故障后剩余输电能力保留电源两个角度，提出盈余功率在送端各站间的切机分配策略。上述方法实现了稳定控制策略与直流控制模式、电网运行方式的解耦，大幅降低工程应用难度。基于上述控制策略的稳定控制系统通过了实时闭环数字仿真和实际电网运行的验证，可在复杂直流电网推广应用。
To ensure the secure and stable operation of voltage source converter-based high voltage direct current(VSC-HVDC) grids, dedicated stability control systems must be deployed, and effective control strategies are essential for their implementation. The control modes of converter valves and the associated topological relationships in VSC-HVDC grids are analyzed. The transmission capacity of the DC grid and that of the sending-end single station are defined, and corresponding calculation methods are proposed. Based on the difference between the pre-fault transmitted power and the real-time transmission capacity, the surplus power of both the DC grid and the sendingend single station under fault conditions is calculated. From two perspectives—generator tripping based on pre-fault generation output and generator retention based on post-fault residual transmission capacity—a surplus power allocation strategy for generator tripping among sending-end stations is proposed. The proposed method decouples the stability control strategy from DC control modes and grid operating conditions, thereby significantly reducing engineering implementation complexity. The stability control system developed based on the proposed strategy has been validated through real-time closed-loop digital simulation and practical grid operation, demonstrating its applicability to complex DC grids.

关键词(KeyWords)： 柔性直流电网;稳定控制系统;直流电网输电能力;盈余功率分配;切机
VSC-HVDC grid;stability control system;DC grid transmission capacity;surplus power allocation;generator tripping

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划（2021YFB2400800）

作者(Author): 祝万,任祖怡,何育钦,赵青春,戴光武,白杨,夏尚学,徐柯
ZHU Wan,REN Zuyi,HE Yuqin,ZHAO Qingchun,DAI Guangwu,BAI Yang,XIA Shangxue,XU Ke

DOI: 10.19585/j.zjdl.202603004

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