摘要
在对特高压交流系统进行电磁暂态仿真时,为了简化系统通常需要在保证待保留系统边界节点短路容量恒定的条件下对外部网络进行等值。传统等值方法要对边界节点进行逐一短路,获得与边界节点数目相同的节点电压方程,根据节点电压方程组联立求解得到节点导纳矩阵。当边界节点较多时,方程组维数较大,计算过程繁琐。利用PSS/E软件中SCEQ模块,对特高压浙北—福州工程投产后的华东电网进行等值,将特高压系统作为研究系统,将500kV系统等值为接入特高压中压侧母线的发电机及其互阻抗。通过等值前后无功调压灵敏度和边界母线短路电流对比,验证了等值方法的正确性。
To perform electromagnetic transient analysis on a part of a largescale UHV AC system,the equivalent simplification of the external power network is carried out to simplify the calculation burden,meeting a constant short circuit capacity at the boundary buses.The traditional methods based on solving node voltage equations comes out of short circuits in each boundary nodes pairs is unfeasible when meets large dimension matrix.This paper makes an application of SCEQ module of PSS/E software into East China power grid equiv-alence after the Zhebei-Fuzhou UHV project is put into operation.The 500kV AC system is reduced and replaced by the mutual impedance of medium sides of UHV transformer and equivalent generators with inner impedance connected to the boundary nodes.The result is verified by boundary bus voltage regulation sensitivity and short circuit current contrast before and after the equivalence process.
出处
《电力与能源》
2014年第4期455-458,共4页
Power & Energy
关键词
特高压电网
系统等值
短路电流
无功调压
UHV grid
AC system equivalence
Short circuit current
Voltage regulation
