Parallel Inverter Circulating Current Suppression Method Based on Adaptive Virtual Impedance

Abstract

In practice, the output impedance and lead impedance of the parallel inverter are often inconsistent, and the inconsistency of the equivalent impedance also causes uneven power between the inverters. In this thesis, the parallel inverter system circulating current is analyzed, and the output impedance inconsistency problem is improved by adaptive virtual impedance. The virtual impedance is different from the actual output impedance, which can optimize the power sharing problem without introducing additional power loss.