Unbalance, flicker, harmonic, voltage and reactive power compensation of the distribution grid using a universal STATOM

Power electronic converters are actively involved in many parts of the power grid as active power filters and FACTs devices. They are employed to actively control the absorbed/injected reactive power of the fixed capacitor banks. These devices have the ability to regulate the voltage of distribution systems. In this paper, some novel features are added to the controller of the compensator without adding any hardware to make the device a universal tool. Having said that, the unbalance of the grid is compensated using the proposed dq0 transformation developed for both positive sequence and negative sequence components. A 5 Hz flicker produced by the dynamic load can be perfectly compensated by the converter. This makes the converter a universal tool that is able to correct the power quality indices of the grid. The MATLAB DSTACOM model is used for the implementation of the proposed features. The simulation results are presented to show the effectiveness of the proposed controller.