The main objective of control theory has long focused on the stability analysis of system equilibrium and stabilizing controller synthesis. But these can not meet the practical need anymore.

控制理论长期以来将控制目的主要集中于系统平衡位置稳定性和设计控制器以保证对系统进行镇定上，已不能符合控制系统当今的实际要求。

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Power system security and stability analysis is necessary to the security and stability operation of power systems.

电力系统安全稳定分析是保障电网安全稳定运行的重要环节。

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Of the loops control system stability analysis.

对各环控制系统进行稳定性分析。

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