The Parallel Multi-Inverter System Based on the Voltage-Type Droop Control Method

Abstract

This paper proposed a voltage-type droop control method for the parallel multi-inverter system to realize power sharing without an interconnection line, and its power sharing principle is analyzed in detail. After that, a small-signal model of the multi-inverter system, which contains l lines, d nodes, s inverters, and p RL loads, is established for system stability analysis. Then based on the small-signal model, the influence of droop coefficients on system stability and dynamic performance is analyzed. Finally, the simulation and experiment results demonstrate the feasibility and effectiveness of the proposed method, and the power equipartition meets the requirements.