Three-Port DC–DC Converter for Stand-Alone Photovoltaic Systems
Three-Port DC–DC Converter for Stand-Alone Photovoltaic Systems
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DOI：
10.1109/tpel.2014.2331343
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发表时间：
2015-06
影响因子：
6.7
通讯作者：
Yihua Hu;W. Xiao;W. Cao;B. Ji;D. Morrow
中科院分区：
文献类型：
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作者：
Yihua Hu;W. Xiao;W. Cao;B. Ji;D. Morrow
系统效率和成本效益对光伏发电系统至关重要。本文通过开发一种新型的三端口dc-dc转换器来解决这两个问题，该转换器基于改进的反激拓扑结构。它提供了一个紧凑的单单元解决方案，具有优化的最大功率点跟踪（MPPT）、高升压比、电流隔离和多种工作模式，适用于国内和航空航天应用。首先进行理论分析，分析其工作模式，然后进行仿真和实验工作。本文重点研究了一种综合利用PWM和相移控制的调制策略，以满足光伏发电系统实现最大功率和输出电压调节的要求。设计并制作了一个250w的变换器样机，在系统集成度和转换效率方面进行了实验验证。
System efficiency and cost effectiveness are of critical importance for photovoltaic (PV) systems. This paper addresses the two issues by developing a novel three-port dc-dc converter for stand-alone PV systems, based on an improved Flyback-Forward topology. It provides a compact single-unit solution with a combined feature of optimized maximum power point tracking (MPPT), high step-up ratio, galvanic isolation, and multiple operating modes for domestic and aerospace applications. A theoretical analysis is conducted to analyze the operating modes followed by simulation and experimental work. This paper is focused on a comprehensive modulation strategy utilizing both PWM and phase-shifted control that satisfies the requirement of PV power systems to achieve MPPT and output voltage regulation. A 250-W converter was designed and prototyped to provide experimental verification in term of system integration and high conversion efficiency.