A power quality control system based on grid-connected photovoltaic power generation

Considering the features of microgrid with grid-connected photovoltaic (PV) generation, a PV grid-connecting and power quality control system that not only can implement grid-connection of PV generation but also can implement reactive power compensation and filter harmonic currents is proposed. Firstly, the architecture and principle of the proposed system are presented and its mathematical model is built; then a dead-bead compound control strategy suitable to the proposed system is put forward, and theoretical calculation of pulse width modulation under the proposed control strategy is emphatically analyzed and the method to acquire compound instruction is given; finally, the simulation model and experimental platform for the proposed system are constructed and a concrete scheme to implement the proposed system is given. Operational data shows that the architecture and control strategy for the proposed system are effective and reasonable.