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电网技术  2012 

基于PSASP短路计算的区域电网等值方法

, PP. 113-117

Keywords: 等值方法,电流源,节点导纳矩阵,电力系统分析综合程序,电磁暂态计算程序

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Abstract:

使用PSCAD/EMTDC软件对大型区域电网的局部线路和附近区域进行电磁暂态分析,需要将区域电网分为内部网络和外部网络2部分,对外部网络进行等值简化。传统的网络等值方法需要建立被等值系统的节点导纳矩阵,通过高斯消元法化简网络,计算工作量巨大。为此提出了基于PSASP短路计算的区域电网等值方法。通过全部边界节点的同时短路获得注入电流源参数。然后采用边界节点逐一短路,获得与边界节点数目相同的节点电压方程组,联立求解出节点导纳矩阵。新方法直接求解边界节点对应参数,计算量小。含特高压线路的大型区域电网仿真分析表明,PSASP原网络和PSCAD/EMTDC等值网络的短路电流基本一致,验证了等值方法正确性。最后分析比较了新方法与传统的静态等值方法,探讨了新方法的适用范围。

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