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This paper describes the development of a robust control technology adapting Kalman filter in order to attend to the problems that arise in power quality. This methodology makes use of a three-phase three-wire unified power quality conditioner (UPQC) under unbalanced and distorted supply conditions. In spite of harmonics and frequency oscillation, the Kalman filter determines the amplitude, phase angle and frequency of load currents and source voltages. The main ideas are to use Kalman filtering algorithm to acquire fundamental component of load current and source voltage and to use the least squares method which is relatively simple and faster. The proposed robust Kalman filter-based UPQC system mitigated the issues such as voltage sag, voltage swell, harmonics distortions (voltage and current), and unbalanced supply voltage and power factor. The results are justified using the MATLAB/Simulink software to support the Kalman filter-based control algorithm under steady state and dynamic operating conditions.
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