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基于相量测量单元技术的广域测量系统使得电力系统向广域监测与控制的方向发展。在这个过程中,信号传输和处理过程中时滞的影响不容忽视。特征值分析表明,时滞τ的影响可以转化为与角频率ω相关的相位滞后和与衰减因子σ相关的增益放大,从而对闭环系统的区间模式阻尼和系统稳定性产生影响。文中利用相位超前／滞后模块和增益调节模块,构成时滞补偿环节,以消除时滞的影响,保证系统的稳定性。通过等值两机系统上的时域仿真,对不同时滞条件下的区间模式阻尼和补偿效果进行了研究。结果表明,所设计的时滞补偿环节能够在一定时滞范围内有效地维持采用远方反馈信号的阻尼控制效果,具有一定的工程意义。
The wide area measurement system based on the phasor measurement unit technology makes the power system develop in the direction of wide area monitoring and control. In this process, the influence of skew in signal transmission and processing can not be ignored. Eigenvalue analysis shows that the influence of delay τ can be transformed into the phase delay related to the angular frequency ω and the gain amplification related to the attenuation factor σ, which affects the interval mode damping and the system stability of the closed-loop system. In this paper, the phase lead / lag module and the gain adjustment module are used to form a time delay compensation component to eliminate the influence of time lag and ensure the stability of the system. Through the time-domain simulation on the equivalent two-machine system, the damping and compensation effect of interval mode under different time delay conditions are studied. The results show that the designed time delay compensation can effectively maintain the damping control effect of using the remote feedback signal within a certain time delay, which has certain engineering significance.