Harmonics Mitigation and Non-Ideal Voltage Compensation Utilizing Active Power Filter Based On Predictive Current Control

It is well-known that the presence of nonlinear loads in the distribution system can impair the power quality. Furthermore, the problem becomes worse in microgrids (MGs) and power electronic-based power systems as the increasing penetration of single-phase distributed generation may result in more unbalanced grid voltage. Shunt active power filters (SAPFs) are used for
improving the power quality and compensating the unbalance grid voltage. This paper presents a modification of the classical control structure based on the finite control set model predictive control (FCS-MPC). The proposed control structure can retain all the advantages of finite control set MPC, while improving the input current quality. Furthermore, a computationally efficient cost function based on only a single objective is introduced, and its effect on reducing the current ripple is demonstrated. The presented solution provides a fast response to the transients and as well as it compensates for the unbalanced grid voltage
conditions. A straightforward single loop controller is compared to the conventional way of realizing the APFs, which is based on space vector pulse width modulation (SVPWM). Moreover, the proposed control solution is compared with some of the control structures in the literature. The comparison has been done in terms of dynamic response, input current total harmonic distortion
(THDi), and controller structure complexity. The simulation results have been obtained from MATLAB/SIMULINK environment, while the obtained experimental results, utilizing a 15 kVA power converter, highlight the effective performance of the proposed control scheme and verifies the introduced MPC based method as a viable control solution for SAPFs.