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采用广域信息可有效地提高大型互联电力系统的动态性能。在这个过程中,信号传输和处理的时间延迟不可忽略。文中利用留数矩阵确定广域控制回路;采用Pade逼近法近似广域信号时间延迟,并写成状态空间形式,使系统变为不显含时延项的控制系统;设计了区间阻尼控制器,分析了时延对其性能的影响,并应用线性最优方法确定其反馈控制参数。两区四机系统上的仿真结果说明了考虑时间延迟的情况下,应用线性最优方法来确定区间阻尼控制器的反馈控制参数,能有效抑制区间低频振荡,提高互联电网的稳定性。
The use of wide area information can effectively improve the dynamic performance of large interconnected power systems. In this process, the time delay of signal transmission and processing can not be neglected. The paper uses the matrix of residuals to determine the wide-area control loop. The Pade approximation method is used to approximate the time delay of the wide-area signal and the state space form is written to make the system into a control system that does not contain the delay term. The interval damping controller is designed and analyzed The influence of the delay on its performance, and the linear optimal method to determine the feedback control parameters. The simulation results of the two-zone four-machine system show that using the linear optimal method to determine the feedback control parameters of the interval damping controller can effectively suppress the low-frequency oscillation in the interval and improve the stability of the interconnected power grid.