电网系统保护在线监视研究及典型应用

Online monitoring for large power system protection and its optimization strategy

为应对复杂交直流大电网出现的新型安全稳定问题,我国正在积极开展系统保护建设,由于其覆盖范围广泛、控制资源众多、控制策略复杂、动作影响巨大,因此实时调度运行中须全面掌握系统保护运行状态并动态优化动作策略。文中首先提出了大电网系统保护在线监视及策略优化的总体框架,主要包括状态监视、仿真建模、在线校核、策略优化等主要环节。随后,探讨了各环节中关键技术的基本思路,重点论述了策略优化辅助决策的具体方法,主要探讨了频率越限辅助决策和断面潮流越限辅助决策。最后,给出了在华东电网频率协控系统、华中电网天中直流受端协控系统中的典型应用,验证了文中方法的有效性。

In order to deal with the new features of complex AC/DC power grids, China is developing the construction for system protection. The broad control resources, complex control strategy and the great action response require real-time dispatching operation to fully grasp the operating state of the system and dynamically optimize the action strategy. This paper developed the overall frame of online monitoring and strategy optimization for large power grid system protection at first, including state monitoring, modeling and simulation, real-time analysis, strategy optimization, etc. Then, this paper introduced their some key technology. The specific method for strategy optimization is mainly discussed. The proposed online monitoring technology is applied to the frequency coordinating control system in east China power grid and the coordinating control system for the receiving end of Tianzhong UHVDC project in central China power grid, which verified the effectiveness of the proposed method.