户用型光伏供电系统DC/DC变换器的研究

Research into DC/DC Converter in Household-type Photovoltaic Power Supply System

根据户用型光伏发电系统的特点与要求,在扰动观察法的基础上引进了自适应预测的方法以提高最大功率点跟踪(MPPT)的跟踪速度。根据户用型安全机制、功率密度、输入低压大电流等特点,采用推挽正激电路作为DC/DC变换器的主电路,详细分析了其电路结构与工作原理,建立了数学模型。实验表明该方案减小了电路损耗,提高了MPPT的跟踪速度和精确性,具有较好的实际应用价值。

This paper introduces a adaptive prediction algorithm to raise the tracking velocity of maximum power point tracking（MPPT） based on the perturbation observation method according to the characteristics and requirements of household-type photovoltaic power supply system. Accord- ing to the characteristics of household-type such as the safety mechnism,power density,input low voltage and large current, etc. , taking the push-pull forward circuit as the main circuit of DC/DC converter,this paper analyzes the circuit structure and operation principle in detail, establishes the math model. The experiment shows that the project minishes the circuit loss and raises the tracking velocity and accuracy of MPPT,has better practical application value.