Forming of Current of the Single-Phase Grid Inverter of Local Combined Power Supply System with a Photovoltaic Solar Battery

Abstract

The features of realizing of mode of the current source in a single-phase grid inverter with the combination of the power active filter function for the combined power supply system of a local object with a photovoltaic solar battery and with connection to alternating current grid are considered. The choice of the circuit parameters is justified taking into account the nonlinear load. The comparison of various principles of the formation of instantaneous value of a current of the inverter is performed. The use of the relay controller of a current with combined modulation in combination with a modified algorithm of switching the inverter's keys is proposed. It allows improving the harmonic composition of the grid current while reducing the energy losses in the inverter's keys. A mathematical model of the system "a grid AC - a grid inverter - the load" with a block for determining the power losses in the keys is developed.