±800kV云广工程逆变站阀组最后断路器保护逻辑改进分析
Improvement on Last Breaker Protection Logic for Valve Group in Inverter Station of ±800 kV Yun-Guang DC System
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摘要: ±800kV云广特高压直流输电工程单极采用双阀组串联设计,每个阀组均配置最后断路器保护。文中分析了云广特高压工程逆变站阀组最后断路器保护跳闸的原理,指出阀组最后断路器保护跳闸逻辑存在威胁系统安全的风险。针对该风险提出跳闸逻辑的改进方案,并在现场得到应用,对高压直流输电系统设计、电网安全稳定运行具有重要的参考意义。Abstract: ±800 kV Yun-Guang DC transmission project is designed with two series 400 kV converters for each pole,and each converter is designed with an independent last circuit breaker protection.The principle of last circuit breaker protection in inverter station in Yun-Guang ultra high voltage direct current（UHVDC） project is analyzed in detail.It is pointed out that the protection logic of last breaker protection exists major risk to power grid.An improved scheme of the tripping logic is given and executed on site to avoid the risk,which has important reference value on the design of high voltage DC transmission system and stable operation of power grid.
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