Parallel Operation of Single-Phase Inverter Stages

摘要

A new control scheme for parallel operation of single phase inverter stages, suitable for decentralized power systems is presented. Different arrangements of full-bridge IGBT inverter stages are compared in terms of component stress, ripple cancellation and control effort. Special problems resulting from Common-Mode Voltages driving circulating CM currents are treated. Different methods to reduce and to avoid the associated problems are discussion. The theoretical analysis as well as the presented approach is proven by simulation as well as measurement results from a 6kW-prototype.