Research on Two-shot Reclosing Technology of UHV AC/DC Interconnected Power Grid Based on Off Line Simulation
In AC/DC interconnected power system,when the important AC transmission lines have faults and power supply is broken,the safe and stable operation of power grid will be seriously threatened.At present,one-shot auto-reclose is widely used in high voltage transmission lines.In order to enhance the reliability of power supply,this paper presents a design idea of the two-shot auto-reclose for AC/DC hybrid power grid,and introduces a specific implementation method of adding the secondary reclose logic to circuit breaker relay.The PSCAD program is used to simulate and analyze a practical power grid.The results show that AC system had faults lead to multiple trip and reclose,and system disturbances produce multiple shocks.When the time interval of tripping and closing is set reasonably,although DC voltage drops twice or more continuously,it will not lead to DC pole blockade.Therefore,the reliability of power supply can be improved by adding the secondary reclose logic,and it will not do great harm to the DC power system of AC/DC interconnected power grid.
the two-shot reclosing extra-high voltage AC/DC interconnected power grid DC system blocked off line simulation
Yimin Liu Juan Du Fei Cao Liming Su Rui Yu Ning Wang
North China Branch of State Grid Corporation of China,Beijing 100053,China Beijing Sifang Automation Co.,Ltd.,Beijing 100085,China
国际会议
上海
英文
191-193
2018-12-22（万方平台首次上网日期，不代表论文的发表时间）