鉴于光伏发电等新能源可再生系统中输出电压过低、受环境影响大等问题,提出一种新型的高增益三端口直流变换器及控制策略。该变换器拓扑的3个端口分别连接光伏发电端、储能端和负载端,具有开关器件应力低、各输入源功率可灵活分配、耦合电感漏感能量可被循环利用等优点。详细分析了该拓扑在各工作模式下的原理和稳态特性,并与现有同类变换器的工作特性进行对比。根据光储供电系统的控制要求和变换器在不同工况下的功率流动情况,研究相应的模式运行与切换控制策略。搭建一台300 W的样机进行测试,实验结果验证了所提方案的可行性。
Abstract
In view of the problems of low output voltage and large environmental impact in new energy renewable systems such as photovoltaic power generation, this paper proposes a novel high-gain three-port DC-DC converter topology and control strategy. The three ports of this converter are connected to the photovoltaic power generation end, the energy storage port end, and the load end, respectively. It has advantages of low switch device stress, flexible power allocation among input sources, and sirong excitation energy recovery ability of the coupled inductor. The operating principles and steady-state conditions of the converter in various operating modes are analyzed in detail, and the performances of the circuit topology are compared with those of similar converters. According to the control requirements of the optical storage and power supply system and the power flow of the converter under different working conditions, the corresponding mode operation and switching control strategy are studied. A 300 W prototype is built for validation, and the results of the validation demonstrate the feasibility of the proposed structure.
关键词
直流变换器 /
能量管理 /
多输入 /
高增益 /
光伏发电 /
模式切换
Key words
DC-DC converters /
energy management /
multiple-input /
high gain /
photovoltaic power generation /
mode switching
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基金
福建省发改委科技项目（00389102）; 晋江市福大科教园区发展中心科研项目（2019-JJFDKY-37）
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