云南富宁换流站交流500 kV电气主接线可靠性研究

Reliability Research of AC 500 kV Main Electrical Wiring Scheme in Funing Convertor Station Yunnan Province

云南富宁±500 k V换流站为金沙江观音岩水电站直流送出工程的受端换流站,根据系统近、远期规划,采用交流500 k V母线三分段设计,以满足云南文山和广西百色地区灵活接受电力的要求,并提出一个半断路器接线和双母线接线两个方案。该文通过建立变压器、断路器等设备可靠性分析模型,根据各设备的故障率、平均修复时间、计划检修率等基本参数,得出不同判据下的负荷点、电源点可靠性指标和系统可靠性指标。经计算分析,一个半断路器接线优于双母线接线方案,结合经济性、灵活性比较,推荐该换流站采用一个半断路器、母线三分段接线。

Funing ±500 k V converter station in Yunnan province is the receiving terminal station of DC transmission project for Guanyinyan Hydropower Station in Jinshajiang River. According to the system of short and long term planning, 500 k V AC bus three-segment design is adopted to meet Yunnan and Guangxi area＇s flexibility requirements on accepting the electricity. And two wiring design schemes（viz.： one-and-a-half breaker connection and double bus connection） have been put forward. In this paper, the reliability analysis model of transformer, circuit breaker and other equipment is established. Both reliability indexes of load point and power point and the system＇s reliability index under different criterion are obtained by using the model and the equipment fault rate, mean time to repair（MTTR）, planned maintenance rate and other basic parameters. Through calculation and analysis, the one-and-ahalf breaker connection has been proven to be better than the double bus connection scheme. Considering the economic and flexibility comparison, it is recommended that the converter station adopt one-and-a-half breaker and bus threesegment connection.