Ameliorating the dynamics of DC distribution systems using average current mode control

Abstract

This paper presents a method to stabilize DC power distributed systems (DPSs) under Average-Current-Mode (ACM) control technique. ACMs lacked the attention as the Voltage-Mode-Control (VMC) and Peak-Current-Mode (PCM) control methods are prevalent in the literature. The proposed method adds an extra negative feedback to the original ACM controller in order to eliminate the impedance interaction between the source and load converters. As a result, the peaking in the source-converter output impedance (Zo) was eliminated. From a mathematical perspective, the added feedback loop compensates for the magnitude deficiency, which occurs at the resonance frequency of the source-converter, in the denominator of Zo. Hence, the dipping in the denominator magnitude was removed. The proposed controller was studied and analyzed mathematically, by simulations, and experimentally. All of the outcomes validated the effectiveness of the proposed controller.