直流真空断路器换流参数LDW-PSO优化设计方法研究

直流真空断路器(DC VCB)被广泛应于直流输配电系统,但开断时需换流回路强制电流过零实现真空灭弧。换流回路参数直接影响主断路器灭弧能力、弧后鞘层发展速度以及断路器设计成本。本文以有源直流真空断路器为研究对象,结合连续过渡模型建立开断过程各阶段状态方程。考虑多约束条件构建灭弧能力强、弧后鞘层发展速度快和断路器设计成本低的适应度函数;利用权重线性下降PSO算法(LDW-PSO)获得各优化目标下换流电感L和换流电容C参数配置。综合考虑各目标优化配置结果构建最佳适应度函数,并利用LDW-PSO优化得到12 kV/10 kA有源DC VCB的换流参数LC的最佳配置。仿真结果表明,该方法确定的LC参数在确保断路器可靠关断的同时可有效降低断路器的设计成本,达到优化设计目的。

Design Optimization of Direct Current Vacuum Circuit Breaker: A Simulation Study

Operation of the active direct-current vacuum circuit breaker (ADC-VCB) was mathematically modeled, theoretically analyzed and numerically simulated in Linear Decreasing Weight Particle Swarm Optimization (LDW-PSO) algorithm and in Monte Carlo method for design optimization of the commutation LC-circuit.The influence of the LC-circuit on the arc extinguishing ability and growth of post-arc sheath-layer was investigated.The (12 kV/10 kA) ADC-VCB, equipped with the optimized LC-circuit, was tested via Monte Carlo simulation.The simulated results show that the LC-circuit optimized in LDW-PSO algorithm is capable of ensuring reliable interruption of ADC-VCB.In addition, when it comes to optimization of LC-circuit of ADC-VCB, LDW-PSO algorithm outperforms the conventional PSO algorithm because of lower design cost.Experimental evaluation of the newly-designed ADC-VCB was underway and will be reported later.