Virtual d-q Control Strategy for Capacitor-Split Type Active Power Decoupling

Abstract

This paper presents a virtual d-q control strategy for capacitor-split type active power decoupling circuits. The performance of single-phase ac-dc converters is inherently degraded by the well-known double-line frequency ripple power. Active power decoupling circuits have emerged to resolve undesirable ripple power in single-phase power systems while using minimized dc capacitances. The proposed algorithm employs a virtual d-q transform technique to control an inductor current in the decoupling circuit, resulting in high performance in tracking references even with a low bandwidth current-loop compensator. The effectiveness of the proposed algorithm was verified by a MATLAB simulation.