FPGA-based Algorithm for Harmonic Current Mitigation

The present paper deals with problems related to the damaging effect of nonlinear loads that expressed in harmonic current, where we proposed an instantaneous calculation of the sinus and cosine functions related to the fundamental frequency using a multi-variable filter (FMV).The main idea is to go beyond the limits caused by the use of PLL so as to extract instantaneously and precisely the fundamental component of the voltage of the power system. To do that the FMV algorithm is implemented on the FPGA and the Newton-Raphson algorithm is depicted in order to calculate the needed inverse square root where the obtained sine and cosine functions are used to optimize the instantaneous imaginary power algorithm for extracting the harmonic components. Simulations and exprimental results are performed to demonstrate the effectiveness of the proposed study.