Adaptive Delay Compensator for the Robust Wide-Area Damping Controller Design

This paper presents an adaptive delay compensator (ADC) on the basis of the latest development in wide-area measurement system (WAMS) to cater to varying latencies. The proposed compensator can effectively reciprocate the phase deviation resulting from varying delays to improve the performance of central wide-area damping controller (WADC). The greatest challenge to continuous delay compensation is the uncertainty regarding the inherent robustness of the central controller. The proposed technique provides an opportunity to epitomize the uncertainty retrieved from phase compensated delay. Next, taking the uncertainty into consideration, the mixed H2/H∞ synthesis technique is adopted for the robust design of WADC. The comprehensive case studies are conducted including small signal analysis and nonlinear time domain simulation. Moreover, different delay variation scenarios are investigated and it is confirmed that the proposed scheme accomplishes the desired performance, both in terms of robustness and satisfactory damping action despite the presence of system nonlinearities and time varying delays.