Current sharing control for parallel DC-DC buck converters based on consensus theory

Jiang, Congrang; Du, Haibo; Wen, Guanghui

doi:10.1109/icca.2017.8003117

Cited by 7 publications

(3 citation statements)

References 11 publications

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“…When multiple IPOS phase-shifted full-bridge converter modules constitute a parallel system, since the output characteristics of the converter using voltage stabilization control are approximately voltage sources, the problem of uneven output currents is prone to occur in the parallel system, which may lead to high thermal stress on the power device and even the breakdown of the power device [4]. Therefore, Electronics 2023, 12, 3685 2 of 17 current-sharing control technology is often used to achieve the average distribution of the output current between converters [5]. In [6][7][8][9], droop control was used to achieve current sharing in parallel systems.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis and Control Strategy Optimization of a Paralleled IPOS Phase-Shifted Full-Bridge Converters System Based on Droop Control

Qin,

Cai,

Lin

2023

Electronics

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The application of high-power DC equipment further increases the power supply scale of DC systems. But, it is difficult for a single converter to support high transmission power, so multiple converters must operate in parallel for efficient power transmission. In a parallel system comprising many IPOS phase-shifting full-bridge converters, current sharing can be realized via droop control. However, the stability of the parallel system using current-sharing control will appear poor in light load conditions, so it is necessary to analyze the stability of parallel systems in light load conditions. Firstly, a single IPOS phase-shifted full-bridge control system is modeled; on this basis, the state space model of the n-module paralleled IPOS phase-shifted full-bridge converters system is derived. Then, the influence of load power and the number of parallel IPOS phase-shifted full-bridge converters on the system stability is analyzed via eigenvalue analysis, and an optimal control strategy based on a particle swarm optimization algorithm is proposed. The control parameters are optimized for the parallel system of eight IPOS phase-shifted full-bridge converters. Finally, the above results are simulated to verify the accuracy of the stability analysis and the feasibility of the optimized control strategy.

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Section: Introductionmentioning

confidence: 99%

Stability Analysis and Control Strategy Optimization of a Paralleled IPOS Phase-Shifted Full-Bridge Converters System Based on Droop Control

Qin,

Cai,

Lin

2023

Electronics

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“…In the literature, there have been some developed control methods for the parallel DC-DC converters, for example, terminal sliding mode control and adaptive control method are introduced in Zhao et al [6] and He et al [7], the master-slave control presented in Mazumder et al [8] and some recent intelligent control in other studies [9][10][11][12][13][14], and observation-based control in Ali et al [15] and Du et al [16]. It should be pointed out that the most of these control algorithms are based on the centralized control.…”

Section: Introductionmentioning

confidence: 99%

Distributed cooperative control for parallel direct current–direct current buck converters based on multi‐agent consensus theory

Zhu

Wang

Cheng

et al. 2021

Asian Journal of Control

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The voltage regulation and power sharing for parallel direct current–direct current (DC–DC) buck converters is studied in this paper by using the multi‐agent consensus theory. At the first step, the control problem of parallel DC–DC buck converters is modeled as the consensus problem of multi‐agent system. Different from the most existing algorithms for parallel DC–DC buck converters, a new distributed cooperative control algorithm is proposed to implement plug‐and‐play and to enhance the system's flexibility. For the current‐loop, a finite‐time control algorithm is employed to improve the dynamic response for the current tracking. The rigors stability analysis is given and the simulation result is presented.

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“…Although the parallelconnected power converters allow the use of low-power devices for high-power applications, each power module might be accompanied with the issue of imbalanced current distribution. Therefore, the regulation ability of timely current sharing is necessarily required [4][5][6][7]. Another research focus of parallelconnected converters is the interleaving control schemes, which are designed for reducing the inductor current ripples, and enlarge the power efficiency [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Parallel‐connected buck converters controlled by capacitor current feedback based PT with current‐sharing ability

Geng

Xia

et al. 2018

IET Power Electronics

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Parallel-connected power converters have been widely used in the application scenarios required high power to deal with the high load current. In this study, the pulse train (PT) controller with the advantages of fast response speed and simple structure is newly applied to the parallel-connected buck converters with current-sharing ability. However, as the converters operated in continuous conduction mode, undesirable low-frequency voltage oscillation will be brought about by the PT control method. To resolve this problem, a novel capacitor-current-feedback-based PT (CCF-PT) control method is proposed to eliminate the low-frequency oscillation of the parallel-connected buck converters. The approximate discrete time model of the CCF-PT-controlled buck converters is established, and the bifurcation diagrams of output voltage and inductor current changing along with the current scale factor, the capacitor-current-feedback coefficient and the load resistance are drawn to show the operation stability of the converters. Simulation and experimental results are obtained, which indicate that the proposed parallelconnected buck converters with CCF-PT control have excellent performance such as fast response, wide load range and effective suppression of low-frequency oscillation.

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Current sharing control for parallel DC-DC buck converters based on consensus theory

Cited by 7 publications

References 11 publications

Stability Analysis and Control Strategy Optimization of a Paralleled IPOS Phase-Shifted Full-Bridge Converters System Based on Droop Control

Stability Analysis and Control Strategy Optimization of a Paralleled IPOS Phase-Shifted Full-Bridge Converters System Based on Droop Control

Distributed cooperative control for parallel direct current–direct current buck converters based on multi‐agent consensus theory

Parallel‐connected buck converters controlled by capacitor current feedback based PT with current‐sharing ability

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