摘要
提出基于真空断路器与SF_6断路器串联的混合式高压直流断路器新型拓扑结构,在传统强迫过零直流开断的基础上,提出以高压串联晶闸管组件续流支路创造主开关电压零休的思路,进而提高主开关的动态介质恢复强度。分析了新型混合式高压直流断路器的拓扑结构、工作原理、工作过程,得到其电压零休时间的数学描述和动态电压分布协同调控措施。然后基于连续过渡模型和改进Mayr模型搭建了新型混合式高压直流断路器的仿真电路,分析得到续流支路限流电阻、电感、振荡回路参数等对电压零休时间、反向暂态恢复电压的影响规律。
A novel hybrid HVDC CB(Circuit Breaker) based on VI(Vacuum Interrupter) and GI(SF_6 Interrupter) connected in series is proposed. Based on the DC interruption through traditional artificial current zero method,the idea of creating the zero-voltage for the main mechanical switch by using the continuous branch of high voltage thyristor module and current limiting element is put forward to improve the DDRS(Dynamic Dielectric Recovery Strength). The topological structure,working principle and working process of the hybrid HVDC CB are analyzed,based on which,the mathematic description of the zero-voltage time and the coordinated control measures of the dynamic voltage distribution are obtained. The simulation circuit of the novel HVDC CB is built according to the continuous transition model and the improved Mayr arc model. The influences of the current-limiting resistance and inductance of the follow-current loop and parameters of the oscillation circuit on zero-voltage time and the inverted transient recovery voltage is gained.
引文
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