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Information 2019, 10(3), 91; https://doi.org/10.3390/info10030091

An Implementation of Parallel Buck Converters for Common Load Sharing in DC Microgrid

1
School of Electrical Engineering, Hebei University of Technology, Tianjin 300401, China
2
School of Electronics and Information Engineering, Hebei University of Technology, Tianjin 300401, China
3
Department of Automation, Shanghai Jiaotong University, Shanghai 200240, China
*
Authors to whom correspondence should be addressed.
Received: 7 January 2019 / Revised: 5 February 2019 / Accepted: 12 February 2019 / Published: 1 March 2019
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Abstract

The increase in demand for clean, safe, and environmentally friendly renewable energy sources faces several challenges such as system design and reliable operations. DC microgrid (MG) is a promising system due to higher efficiency and natural interface to renewable sources. In the hierarchical control of DC Microgrid, the V-I droop control is deployed usually in primary control level for common load sharing between converters. However, conventional droop control causes improper current sharing, voltage variations, and circulating current regulation due to the presence of droop and line resistance between converters. The aim of this paper is to presents the primary control level design of buck converters in current mode control according to the concepts of time constant and time delay, and secondary control design for parallel operations in distributed manners by combining methods, namely, low bandwidth communication (LBC), circulating current minimization techniques, and average voltage/current control. Moreover, different time delays are used for two converters to testify the effects of communication delays on current sharing and voltage restoration. The simulation is done for 2 × 2.5 KWdc parallel buck converters in PLECS (a Simulation software used for high speed simulation for power electronics) environment which shows excellent results in minimizing circulation currents, enhancing proportional current sharing, and restoring the grid voltage. View Full-Text
Keywords: DC Microgrid; Distributed Secondary control; low bandwidth communication; V-I droop control; buck converter DC Microgrid; Distributed Secondary control; low bandwidth communication; V-I droop control; buck converter
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Ali, S.; Shengxue, T.; Jianyu, Z.; Ali, A.; Nawaz, A. An Implementation of Parallel Buck Converters for Common Load Sharing in DC Microgrid. Information 2019, 10, 91.

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