CWDC strategy for paralleled multi-inverter systems achieving a weighted output current distribution

Abstract

A current-weighting-distribution-control (CWDC) strategy for paralleled multi-inverter systems is presented in this paper. With a CWDC strategy, the inverters in the systems can have different power ratings and they can be connected in parallel to achieve a weighted output current distribution by only adding weighted distribution circuits to each inverter. In such systems, each inverter has an outer-loop voltage controller to govern system stability, an inner-loop current controller to improve the system response and a weighted current distribution controller to achieve a weighted output current distribution. Simulation results and hardware measurements from a two-inverter system, and simulation results from a three-inverter system have demonstrated the feasibility of the proposed strategy in weighted current distribution and fast regulation.