Estimation of power quality using Complex H∞ Filter

The present study proposes a novel method of tracking the time varying frequency and amplitude of a distorted power frequency signal using a Complex H_∞ Filter. A new model structure is proposed for estimation of different power quality disturbances of a distorted power signal. The amplitude and of different harmonics are also estimated which shows the robustness of the filter. The performance of Complex H_∞ Filter has been compared with those of ECKF considering signals, which can represent worst case measurement and network conditions in a typical power system. State Space Representation with three states is used for estimation of amplitude and frequency in presence of white noise. Results of simulation demonstrate that under identical conditions, the performance of Complex H_∞ Filter is better compared to ECKF.