提高送端多直流落点系统暂态稳定性的非线性控制策略

摘要

A nonlinear control strategy of coordinating HVDC and generator excitation to improve the transient stability of sending ends multi-feed HVDC system is proposed.First, the nonlinear differential algebraic equation of sending ends multi-feed HVDC system is presented.Then, based on the structure preserving energy function and generalized quasi Hamilton theory, the integrated control strategy which considers the coordination between HVDC and its nearby generator excitation control is derived.The nonlinear characteristic of the power system is well preserved because of the nonlinear controller design based on energy theory.Furthermore, the control strategy is easy to implement because of the simple structure.The simulation results show that the system damping and the voltage stability are improved due to the use of the nonlinear control strategy.%为改善送端多直流落点系统暂态稳定性,提出了一种高压直流输电(HVDC)与发电机励磁协调的非线性控制策略.通过建立送端多直流落点系统非线性微分代数方程模型,将结构保持模型下的能量函数与广义拟Hamil ton理论结合,同时兼顾发电机励磁与HVDC控制的协同作用,设计出一种HVDC与发电机励磁的综合控制规律.该方法从能量的角度出发,充分考虑电力系统的强非线性特性,而且得到的控制器结构简单,易于工程实现.仿真结果表明,该控制规律能够有效提高系统阻尼,起到功率支援的作用,改善系统的暂态稳定性.