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Sustainability 2016, 8(6), 548; doi:10.3390/su8060548

A High-Efficiency Voltage Equalization Scheme for Supercapacitor Energy Storage System in Renewable Generation Applications

School of Information Science and Engineering, Central South University, 22 South Shaoshan Road, Changsha 410000, China
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Academic Editor: Andreas Sumper
Received: 2 April 2016 / Revised: 3 June 2016 / Accepted: 8 June 2016 / Published: 13 June 2016
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Abstract

Due to its fast charge and discharge rate, a supercapacitor-based energy storage system is especially suitable for power smoothing in renewable energy generation applications. Voltage equalization is essential for series-connected supercapacitors in an energy storage system, because it supports the system’s sustainability and maximizes the available cell energy. In this paper, we present a high-efficiency voltage equalization scheme for supercapacitor energy storage systems in renewable generation applications. We propose an improved isolated converter topology that uses a multi-winding transformer. An improved push-pull forward circuit is applied on the primary side of the transformer. A coupling inductor is added on the primary side to allow the switches to operate under the zero-voltage switching (ZVS) condition, which reduces switching losses. The diodes in the rectifier are replaced with metal-oxide-semiconductor field-effect transistors (MOSFETs) to reduce the power dissipation of the secondary side. In order to simplify the control, we designed a controllable rectifying circuit to achieve synchronous rectifying on the secondary side of the transformer. The experimental results verified the effectiveness of the proposed design. View Full-Text
Keywords: voltage equalization; supercapacitor; energy storage systems; renewable generation applications voltage equalization; supercapacitor; energy storage systems; renewable generation applications
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Li, L.; Huang, Z.; Li, H.; Lu, H. A High-Efficiency Voltage Equalization Scheme for Supercapacitor Energy Storage System in Renewable Generation Applications. Sustainability 2016, 8, 548.

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