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http://dx.doi.org/10.6113/JPE.2015.15.6.1609

A Bidirectional Dual Buck-Boost Voltage Balancer with Direct Coupling Based on a Burst-Mode Control Scheme for Low-Voltage Bipolar-Type DC Microgrids  

Liu, Chuang (School of Electrical Engineering, Northeast Dianli University)
Zhu, Dawei (School of Electrical Engineering, Northeast Dianli University)
Zhang, Jia (State Grid, Jilin Electric Power Training Center)
Liu, Haiyang (School of Electrical Engineering, Northeast Dianli University)
Cai, Guowei (School of Electrical Engineering, Northeast Dianli University)
Publication Information
Journal of Power Electronics / v.15, no.6, 2015 , pp. 1609-1618 More about this Journal
Abstract
DC microgrids are considered as prospective systems because of their easy connection of distributed energy resources (DERs) and electric vehicles (EVs), reduction of conversion loss between dc output sources and loads, lack of reactive power issues, etc. These features make them very suitable for future industrial and commercial buildings' power systems. In addition, the bipolar-type dc system structure is more popular, because it provides two voltage levels for different power converters and loads. To keep voltage balanced in such a dc system, a bidirectional dual buck-boost voltage balancer with direct coupling is introduced based on P-cell and N-cell concepts. This results in greatly enhanced system reliability thanks to no shoot-through problems and lower switching losses with the help of power MOSFETs. In order to increase system efficiency and reliability, a novel burst-mode control strategy is proposed for the dual buck-boost voltage balancer. The basic operating principle, the current relations, and a small-signal model of the voltage balancer are analyzed under the burst-mode control scheme in detail. Finally, simulation experiments are performed and a laboratory unit with a 5kW unbalanced ability is constructed to verify the viability of the bidirectional dual buck-boost voltage balancer under the proposed burst-mode control scheme in low-voltage bipolar-type dc microgrids.
Keywords
Bipolar-type DC microgrid; Burst-mode control; Dual buck-boost voltage balancer; N-cell; P-cell;
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