Design Optimization of Distributed PV Power Station Based on the Efficiency Modelling and Analysis

Based on the large amount of data from a 3 MW distributed photovoltaic power station and a module-level experimental platform, the mathematical model of the performance ratio varying with the irradiation is established in this paper. The performance ratio value of the power station is 0.59, which is far below the engineering experience value. Therefore, the inverter efficiency, photovoltaic module efficiency and photovoltaic array efficiency are analyzed individually, and the focus is laid on the loss of performance ratio that caused by the voltage mismatch between the photovoltaic array and the maximum power point tracking of the inverter. In order to improve the performance ratio, the number of modules in series are designed and optimized. The research results are conducive to guide the optimal design of distributed photovoltaic power plants and significantly increase the power generation capacity.