Analysis of harmonic and circulating current for paralleling inverters in MW-level wind energy conversion system

With the increasing of the wind turbine capacity, inverter paralleling is one of the best approaches for MW-level wind power converter system design. This paper presents a new control algorithm for paralleling inverters based on SVPWM, which can reduce the output harmonic currents and inhibit the circulating current between the inverters. The detailed algorithm principles and mathematic derivations are introduced. The experiment results, presented in the end, verify the algorithm.