Authors : S. Elangovan and K. Thanushkodi
Abstract: To improve the quality of the electrical power to the consumers, many power electronic based solutions are available. In the case of active power factor compensation, grid connected voltage source inverter based Shunt Active Power Filter is the versatile solution. But in this system most of the control strategies demand generation of unit vector based on the grid voltage for vector orientation. Due to presence of harmonics in grid voltages and the level of noise in the grid voltage sensing circuits will make estimation of unit vector to be difficult and PLL circuits are necessary. This study presents a simple and efficient method to evaluate the unit vector without the use of PLL or any hardware filter network. This method utilizes d-q reference frame control strategy for shunt active filter and is simulated with a 100 kVAR System. The proposed active filter network is simulated in MATLAB/SIMULINK and the simulation results are presented to validate the effectiveness of this control strategy.
S. Elangovan and K. Thanushkodi, 2015. Power Quality Enhancement Through Active Filtering Schemes for Fluctuating Industrial Loads. International Journal of Soft Computing, 10: 151-156.