A Multiple-Complex Coefficient-Filter-Based PLL-Less Power Quality Control Method for Photovoltaic Generation Systems

In response to the complex control structure and poor dynamic performance of traditional reactive power compensation and harmonic suppression methods in photovoltaic (PV) generation systems, this paper proposes a multiple complex-coefficient filter (MCCF)-based phase-locked loop (PLL)-less power quality control method. Based on MCCF, the fundamental and harmonic components of the load current are quickly and accurately extracted, and current reference values are generated using the instantaneous power theory of the three-phase system in a stationary reference frame. The zero steady-state error tracking of the fundamental and harmonic currents is achieved through a proportional multiple resonance (PMR) controller. Finally, simulation testing was conducted on the traditional control and the proposed control method using Matlab/Simulink software. The simulation results verify the effectiveness and feasibility of the proposed control method.