CAJ | 학술논문

针对一起广东500 kV砚都站开关故障导致直流保护误动作故障，对线路电压突变量保护的逻辑进行了分析，结合故障波形分析了突变量保护误动作的原因，提出了突变量保护逻辑的优化方案。利用贵广玉回直流 PSCAD/EMTDC仿真模型进行不同运行工况下的故障模拟计算，佐证了电压突变量保护定值选取的合理性。按照优化方案对贵广玉回直流RTDS实时仿真系统的直流保护软件进行了修改，通过故障回放验证了优化后的保护逻辑在发生类似故障时，可以有效防止电压突变量保护的误动作。
침대일기엄동500 kV연도참개관고장도치직류보호오동작고장，대선로전압돌변량보호적라집진행료분석，결합고장파형분석료돌변량보호오동작적원인，제출료돌변량보호라집적우화방안。이용귀엄옥회직류 PSCAD/EMTDC방진모형진행불동운행공황하적고장모의계산，좌증료전압돌변량보호정치선취적합이성。안조우화방안대귀엄옥회직류RTDS실시방진계통적직류보호연건진행료수개，통과고장회방험증료우화후적보호라집재발생유사고장시，가이유효방지전압돌변량보호적오동작。
Aiming at a fault of protection misoperation emerged from switches breakdown in the 500 kV Yandu station of Guang-dong, this paper analyses the logic of undervoltage sensing protection and the reasons of the protection misoperation according to the transient fault record, and proposes an optimization scheme of undervoltage sensing protection. Based on simulations on different working situations with the PSCAD/EMTDC simulation model for the HVDC Guizhou-Guangdong Line I, the rationality of protection threshold value selected in this paper is proved. With modified HVDC protection software of RTDS for the HVDC Guizhou-Guang-dong Line I based on the proposed optimization scheme, the on-spot fault recorder playback experiment shows that the optimization protection logic can avoid the undervoltage sensing protection misoperation caused by AC exterior fault.