换流站站用电备自投装置设计及整定

为了保证直流输电工程换流站站用电设备安全稳定运行,必须合理设计站用电系统及备用电源自动投入装置的动作逻辑。以糯扎渡直流输电工程普洱换流站为例,根据主接线形式、运行要求和具体运行工况,对10 k V备自投的五种运行工况分别设计了备自投充放电逻辑和十三种动作投切逻辑,对400 V备自投单母分段运行方式设计了两种动作投切逻辑。同时,对备自投装置的定值整定原则及定值配合相关问题进行了研究,给出了推荐定值。所提出的备自投方案经现场实际运行证明:通过10 k V和400 V两级备自投装置的配合,在各种运行工况下某路或某两路站用电源失电时备自投装置都能快速动作投切至备用电源,无需降低直流输送功率或停运,大大提高了直流系统的可靠性。

Standby power supply automatic switching-on relay design and setting of converterstation auxiliary power system

Perfect station auxiliary power system main diagram and efficient standby power supply automatic switching-on logic should be designed in converter station of HVDC system for the safe and stable operation. According to the electric diagram and operation requirement of Pu'er converter station, five operation conditions are considered and charge/discharge logic and thirteen automatic switching-on/off logic are designed for 10 kV standby power supply automatic switching-on relay, two automatic switching-on/off logics are designed for 400 V standby power supply automatic switching-on relay. Meanwhile, the setting principle and coordination are discussed and the recommended settings are given. The standby power supply automatic switching-on/off logic has been applied in Pu'er converter station, experimental results and operation conditions show that standby power supply automatic switching-on relay will trip the circuit breaker of fault line and switch to standby power supply rapidly while one or two station auxiliary power supply fault without reducing HVDC transmission power, the reliability and stability of HVDC system are greatly improved.