Wide-area phasor power oscillation damping controller: a new approach to handling time-varying signal latency

Abstract

Using present technology, latency associated with remote feedback signals can be determined from the time stamp information at both the PMU location and the control centre. This paper illustrates how this latency could be accounted for in the implementation of a widearea phasor power oscillation damping controller (phasor POD). The basic idea is to adjust the position of the rotating reference frame -used for phasor extraction -to account for the extra phase shift introduced due to latency. The oscillatory component of the original PMU measurement is retrieved out of the delayed signal received at the control centre. Thus, continuous compensation is achieved without requiring any Pade approximation and/or gain scheduling, unlike the techniques reported in the literature. With the proposed modification, a phasor POD is shown to continuously adapt to the actual latency and maintain the desired dynamic performance over a range of different operating conditions.

Utilizing synchrophasor-based supplementary damping control signals in conventional generator excitation systems

“…Power system researchers, over the years, have demonstrated through power system simulation studies, the effectiveness of PMU-based wide-area measurements for power oscillation damping (POD) [6][7][8][9][10][11][12][13][14]. These wide-area measurements may provide better observability of inter-area modes which might not be available in local signals utilized by conventional damping controllers.…”

Wide area control in electric power systems incorporating FACTS controllers: Review

“…Simulation results demonstrate that the lead-lag controller had a poorer stability performance than the proposed controller. A new approach to continuous compensation for time-varying delay is proposed in [51]. Knowledge of computed latency is used in the implementation of a phasor power oscillation damping controller.…”

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