双端电磁环网的N-1静态安全分析

N?1 Static Security Analysis on Two-Terminal Electromagnetic Loop of Power Network

电磁环网问题在现代电网中得到了很大缓解,因此需被重新审视。基于双端电磁环网的网络方程,用补偿法求解变动网络,形成了N?1静态安全分析模型,给出了N?1静态安全的判断依据。研究表明,双端电磁环网的N?1静态安全与转移比、通道占用比和充裕度3个因素密切相关。由于现代电网在这3个因素上容易满足N?1静态安全判据,因此双端电磁环网不一定是薄弱的电网结构。

The problem of electromagnetic loop of power network （EMLPN） has been, to a large extent, alleviated in modem power grid, and hence needs to be reexamined. Based on the network equation of the two-terminal EMLPN, the N-1 static security model was formed by utilizing the compensation method for solving changing network, and consequently the N-1 static security criterion was given. Research shows that the N-1 static security of two-terminal EMLPN is closely related to three factors which refer to the transfer ratio, the path occupancy ratio and the adequacy. Since modem power grid can satisfy the N-1 static security criterion on these three factors easily, the two-terminal EMLPN is not necessarily a weak grid structure.