弱受端系统直流再启动方案
DC Line Fault Recovery Schemes of Weak Receiving Systems
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摘要: 直流再启动可有效提高直流系统的运行可靠性,但也可能给受端系统带来频率和电压冲击。文中对弱受端系统直流再启动方案进行了研究。首先,介绍了直流再启动过程的动作序列,分析了直流再启动对弱受端系统第二、三道防线的影响,指出直流再启动与低频减载配合不好可能导致受端系统连锁故障;其次,提出了直流再启动与弱受端系统第二、三道防线的协调配合原则,并给出了直流再启动方案的评估方法及流程;然后,研究了直流单双极运行方式下的再启动候选方案,并给出系统运行方式配合建议。最后,以某弱受端系统为研究对象,对直流单双极运行方式下的再启动候选方案进行评估,并给出了运行方式建议。仿真结果验证了所提判据和算法的有效性。Abstract: DC line fault recovery improves reliability of DC system.However,impacts on frequency and voltage of weak receiving systems are serious.This paper studies DC line fault recovery schemes of weak receiving systems.The operation sequence of a typical DC line fault recovery is firstly introduced,and impacts of DC line fault recovery on the second and third defensive line of power systems are analyzed.It is indicated that DC line fault recovery and low-frequency load shedding may lead to cascading faults without well coordination.Then,principles for the coordination are put forward,and a assessment of schemes for DC line fault recovery and its flow chart are proposed.Candidate schemes of DC line fault recovery are analyzed,and regulations of system operation are suggested.Finally,schemes for DC line fault recovery of a weak receiving system are studied,and operation suggestions are given.Simulation results demonstrate the effectiveness of the proposed criteria and methods.
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