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电网技术  2014 

高压直流输电非典型工况下过电压异常风险分析

DOI: 10.13335/j.1000-3673.pst.2014.12.030, PP. 3459-3463

Keywords: 直流输电,过电压,非典型工况,交直流电网

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Abstract:

过电压控制是大容量高压直流输电广为关注的一个问题。由于无功大量集中进行补偿,直流扰动或闭锁后换流站电压会短时大幅上升,需要通过预防控制避免过电压引起设备绝缘损坏或产生次生故障。实际系统中发生非典型工况下直流闭锁后过电压异常现象,压升超出常规工况,给电网安全带来风险。详细分析了过电压异常现象的机制,并仿真验证了机制分析的有效性。在此基础上总结了存在过电压异常风险的非典型工况,为过电压绝缘配合设计及交直流电网运行控制提供指导。

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