Influence of Grid-connection Photovoltaic on Power Quality and Relay Protection of Distribution Network

By analyzing the output characteristics of photovoltaic arrays and various existing MPPT control models, the Boost circuit and the perturbation observation method (PO) MPPT mathematical model are established. The model of three-phase photovoltaic inverters is established, which the voltage and current double closed-loop control is adopted, and the output current is controlled by SPWM. Based on the standard node system, a distributed photovoltaic grid-connected matlab simulation model is built, and the impact of grid-connected distributed photovoltaic system on power quality of power system is studied. Finally, the impact of distributed photovoltaic grid-connected on the relay protection of power system is studied, and specific solutions are given for practical engineering application.