PWM- and PFM-controlled switched capacitor converter-based multiport converter integrating voltage equalizer for photovoltaic systems
PWM- and PFM-controlled switched capacitor converter-based multiport converter integrating voltage equalizer for photovoltaic systems
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DOI：
10.1109/ifeec.2017.7992267
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发表时间：
2017-06
期刊：
影响因子：
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通讯作者：
M. Uno;Kazuki Sugiyama
中科院分区：
文献类型：
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作者：
M. Uno;Kazuki Sugiyama
光伏（PV）系统由多个DC-DC转换器组成，包括用于PV串控制的前端转换器、用于电池调节的双向转换器以及用于消除部分遮蔽问题的电压均衡器，因此它们易于复杂且成本高。为了科普这个问题，本文提出了PWM和PFM控制的开关电容变换器（SCC）的多端口变换器（MPC）集成电压均衡器。建议MPC可以通过集成双向PWM转换器，串联谐振转换器（SRC），和SCC。PWM转换器和SRC分别调节电池和负载电压，而SCC起着电压均衡的作用。由于集成化，不仅整个系统大大简化，而且电路元件数量也大大减少。三个光伏组件的150-W的原型是为了验证。实验结果表明，从光伏组件的可提取的最大功率显着提高SCC，而电池和负载电压分别由PWM和PFM控制，分别进行调节。
Photovoltaic (PV) systems consist of multiple dc-dc converters, including a front-end converter for PV string control, a bidirectional converter for battery regulation, and voltage equalizer to preclude partial-shading issues, and hence they are prone to be complex and costly. To cope with this issue, this paper proposes the PWM- and PFM-controlled switched capacitor converter (SCC)-based multiport converter (MPC) integrating voltage equalizer. The proposed MPC can be derived by integrating a bidirectional PWM converter, series-resonant converter (SRC), and SCC. The PWM converter and SRC regulate battery and load voltages, respectively, while the SCC plays a role of the voltage equalization. Not only is the system as a whole dramatically simplified but also the circuit element count is significantly reduced thanks to the integration. The 150-W prototype for three PV modules was built for verification. The experimental results demonstrated the extractable maximum power from PV modules was significantly improved by the SCC, while the battery and load voltages were individually regulated by the PWM and PFM controls, respectively.