Three-port converter system applied to independent photovoltaic power generation occasion
An independent photovoltaic and three-port technology, which is applied in photovoltaic power generation, collectors, and regulation of electrical variables, etc., can solve the problems of battery output ports not sharing the same ground, unable to meet complex constant voltage requirements, and low topology boost capability
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[0050] In order to solve the problems in the prior art, the present invention is based on the classic Boost DC converter and switched capacitor structure, and proposes a three-port converter that can achieve large-scale boost, three-port common ground, and battery charging circuit, and further The corresponding control strategy of the converter is proposed to make it suitable for independent photovoltaic power generation system. .
[0051] The topological structure of the three-port DC converter proposed by the present invention is as figure 1 As shown, the topological structure consists of three parts: Buck-boost bidirectional DC converter, Boost DC converter and switched capacitor unit. In the Buck-boost bidirectional DC converter, V pv , I pv Are the port voltage and port current of the photovoltaic array, the output of the photovoltaic array is used as the input of the port converter, C pv Is the shunt stabilized capacitor of the photovoltaic array, S 1 With S 2 For the swit...
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