并联型多端直流输电系统保护相关问题探讨

发布时间：2018-04-01 17:07

本文选题：高压直流输电　切入点：多端　出处：《中国电机工程学报》2014年28期

【摘要】：该文介绍了并联型多端直流输电保护系统分区、测点和开关刀闸位置以及系统运行的方式。对于多端直流输电系统,直流线路保护设置保护线路全长时,可能发生区外故障误动;换流站线路保护需根据所连接的直流线路数目分别配置。在变电站,每条直流线路会配备一套保护装置,每套保护装置配置多套定值,其保护范围分别覆盖不同长度的线路;这些定值需根据其他换流站的运行情况进行切换;支线路故障后可采取隔离故障线路的处理策略,同时需闭锁隔离出来的换流站。不能通过检测是否存在流经接地站的接地电流,来判断是否发生金属回线接地故障;建议在并联型多端系统中不采用移相处理策略清除金属回线接地故障。高压T区保护采用差动原理,保护动作后,建议相关站采用极闭锁策略。逆变站故障后延时分断换流变网侧开关有利于阀的关断。逆变站换相失败后,更大的直流电流将流经换流阀,需在工程设计环节加以考虑,防止交流系统故障引起的换相失败导致直流过流保护动作。
[Abstract]:This paper introduces the partition of parallel multi-terminal HVDC protection system, the location of measuring points and switch cutters, and the operation mode of the system. For the multi-terminal HVDC transmission system, the full-length protection line of DC line protection is set up. The transmission station line protection needs to be configured according to the number of DC lines connected. In the substation, each DC line will be equipped with a set of protective devices, and each set of protective devices will be provided with multiple sets of fixed values. The range of protection covers different lengths of lines; these fixed values need to be switched according to the operation of other converter stations; the treatment strategy of isolating the fault lines can be adopted after the fault of a branch line. At the same time, it is necessary to lock the isolated converter station. It is not possible to judge whether the grounding fault of metal loop occurs by detecting the grounding current of the grounding station. It is suggested that the phase shift strategy should not be used to remove the metal loop grounding fault in the parallel multiterminal system. The differential principle is adopted in the high voltage T zone protection. It is suggested that the pole-locking strategy should be adopted in the related stations. The delay break and replace rheological network side switch after the fault of the inverter station is beneficial to the shutoff of the valve. After the commutation failure of the inverter station, the larger DC current will flow through the converter valve, which needs to be considered in the engineering design. To prevent commutation failure caused by AC system failure, DC overcurrent protection operation.
【作者单位】：南京南瑞继保电气有限公司;南方电网科学研究院;
【基金】：南方电网公司科技项目(K201030)~~
【分类号】：TM721.1

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