Abstract
In single phase DC-AC systems, double-line-frequency power ripple appears at the DC side inherently. Normally a large electrolytic capacitor can be used to reduce the power ripple at the DC side. But there are several problems with this method as it decreases the power density and reliability of the converter. In addition, a double-line-frequency current ripple appears in case a voltage source serves at the DC side, which is undesired in specific applications. This paper proposes a single phase DC-AC DAB (dual active bridge) converter with an integrated buck/boost stage for power decoupling purpose under low power condition. The proposed active power decoupling method is able to completely eliminate the double-line-frequency power ripple at the DC side. Therefore, a constant DC current can be obtained for requirements in specific DC-AC applications.
Highlights
Proposed in the 1990s, the DAB converter attracts much research interests for its high-power-density, isolated and bidirectional power transfer characteristics [1]. It is widely used in various industrial applications such as battery chargers for plug-in hybrid electric vehicles (PHEVs) [2,3], interfaces for renewable energy sources like photovoltaic power systems [4,5,6,7], uninterruptible power supplies (UPS) [8,9] and vehicle-to-grid (V2G) [10,11]
In single phase DC-AC systems, high power ripple appears at the DC side due to the double-line-frequency characteristics of the transmission power at the AC side
This paper presents the power decoupling of a single phase DC-AC
Summary
Proposed in the 1990s, the DAB (dual active bridge) converter attracts much research interests for its high-power-density, isolated and bidirectional power transfer characteristics [1]. DAB converter operating in open loop, which is able to effectively realize power an active power decoupling method is introduced for CLLC-type resonant DC-AC DABdecoupling converter and reduce capacitance of the converter [18] In this case, and the double-line-frequency operating in the open loop, whichrequirement is able to effectively realize power decoupling reduce the capacitance ripple powerof is the effectively steered thecase, passive decoupling capacitor adjusting the duty requirement converter [18]. The duty cycle of the modulated leg can controlled, the bidirectional power transfer characteristic between the passive energy storage capacitor and the double-line-frequency ripple power can be eliminated due to the mentioned bidirectional power source. This paper presents the power decoupling of a single phase DC-AC dual active bridge converter power is effectively eliminated by the proposed control method on the duty cycle of the bridge leg.
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