江苏500kV电网限流电抗器雷电侵入波过电压特性研究

来源 :中国电机工程学会高电压专业委员会2015年学术年会 | 被引量 : 0次 | 上传用户:baikubk258
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限流电抗器可有效抑制短路电流,在超高压输电线路中逐渐推广应用.雷电侵入波过电压是限流电抗器面临的关键问题之一.本文建立了雷电侵入波下限流电抗器过电压计算简化模型,获得了限流电抗器与雷电入射波、限流电抗器电感、线路参数的关系表达式.采用EMTP建立了限流电抗器雷电侵入波仿真计算模型、包括杆塔的多波阻抗模型、绝缘子串闪络模型等、GIS模型等,计算获得了不同杆塔冲击接地电阻、避雷器安装位置、雷电流波头时间、电容式电压互感器电容量下限流电压器过电压,并分析了上述因素对限流电抗器过电压影响机理.本文提出了两种限流电抗器雷电侵入波过电压的抑制措施拓扑,比较分析了其抑制效果,计算结果为限流电抗器的选型和防雷保护方案提供了参考.
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提出了一种兼顾技术性和经济性的大电网永磁偏置型故障限流器(Permanent-magnet-biased Saturation based Fault Current Limiter,PMFCL)优化配置算法.简要介绍了PMFCL限流机理,并定义了短路电流裕量作为挑选超标节点的标准,将节点自阻抗作为节点短路电流水平的衡量指标,基于节点自阻抗增量构建了兼顾全局限流效果与经济性的PMFCL优化配置评价