Design and analysis of a novel AC‐side power decoupling circuit

Abstract

Abstract A large amount of second (2ω) ripple power are coupled on the DC bus of a single‐phase inverter due to the output pulsating power. In this paper, a novel AC‐side power decoupling circuit (APDC) based on buck‐boost is proposed for a single‐phase inverter. The circuit is connected in parallel with the AC side of the inverter to realise the local decoupling of the pulsating power on the AC side. The working principle of APDC is elaborated and the switching sequence of APDC is derived. The corresponding pulse energy modulation (PEM) control strategy is designed to precisely control the decoupled power. The feasibility and superiority of the proposed APDC together with the PEM control strategy are finally verified by both the simulation and experimental results obtained on a 200 W single‐phase inverter. The results show that 2ω‐ripple power of the system can be effectively buffered and the capacitor capacity in the inverter system is greatly reduced.

Keywords

• Power electronics, supply and supervisory circuits
• Capacitors
• Control system analysis and synthesis methods