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中压固态复合开关切除电容器组的建模与分析

, PP. 163-170

Keywords: 真空断路器,固态复合开关,电弧数学模型,晶闸管阀,电容器组,电流转移

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Abstract:

以真空断路器与晶闸管阀并联构成的中压固态复合开关切除电容器组的研究内容,主要是对电容器组负载电流由真空断路器至晶闸管阀之间电流转移这一暂态过程进行解析分析。首先基于真空断路器分段线性化电弧伏安特性曲线,并结合等效电路构建电流转移数学模型;然后据此推导出中压固态复合开关切除电容器组电流和晶闸管阀端电压解析解;最后据此可以得出晶闸管阀组最佳触发时刻、晶闸管阀组设计参数以及电流转移暂态过程中电流冲击程度。因为实现了由真空断路器至晶闸管阀的电流转移,所以电容器组在晶闸管阀电流自然过零时刻被切除,彻底克服固定电容器(fixcapacitor,FC)开关分闸时造成的开关重燃和操作过电压。中压固态复合开关切除电容器负载暂态性能与晶闸管开关电容器(thyristorswitchcapacitor,TSC)性能基本一致,但却实现了紧凑化、低成本和高可靠性设计。利用仿真和现场录波波形验证了技术可行性。

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