Implementation of Control Strategy for Parallel Operation of Three Phase Inverters

Abstract

This paper presents a control technique allowing parallel operation of 3-phase voltage source inverters. The outer control loop that ensures appropriate loads sharing, is based on the droop control principles with implemented virtual inductance. As the inner control loop a voltage regulation topology using values transformed into Direct-Quadrature (D, Q) synchronous reference frame is implemented. The dynamic and static behavior of whole control system was verified by simulations. Prepared control software based on described strategy was implemented into control systems of the three phase inverters forming a parallel system. The whole parallel system was verified by experimental measurements.