Voltage Disturbance Mitigation in Distribution System Using FM-DQ control based DVR
Abstract
Abstract Aiming at the three-phase unbalanced voltage sag and the real-time requirement of dynamic voltage recovery for voltage detection, a new kind of dq transformation is proposed. The method applies fuzzy control to the mathematical shape to morphological filter for alleviating various interferences such as harmonics, randomness and pulse in the power grid. dq transform utilizes virtual voltage and replace the traditional Butterworth low-pass filter with a new fuzzy – morphological filter. The voltage sag start and end time, amplitude and phase angle change can be detected in real time and accurately. Model also integrates photovoltaic unit at DC link. The MATLAB simulation is utilized to prove that the Fuzzy-FM-DQ method is comparatively gives better performance than traditional PI-LPF-DQ method. It has the advantages of strong anti-interference ability, small delay and simple operation.