Paper Infomation
Study on the Pre-photovoltaic System under Partial Shading Condition
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Author: Yue Zhang, Jincao Chen
Abstract: This paper studied the two-stage pre-photovoltaic system, and proposed to use Buck-Boost circuit as system topology according to wide output voltage range of PV array under partial shading conditions. Three-level technology has been used to solve the problems of large switch voltage stress and large voltage ripple and current ripple appeared in the circuit. And the midpoint-voltage balance control strategy has also been designed based on pulse width modulation to improve the reliability of the system. Meanwhile, for the limitations of the existing conventional maximum power point tracking (MPPT) algorithm under uneven illumination, we put forward an MPPT algorithm based on mathematical model which is suitable for any lighting conditions. The results have shown that the designed system can effectively balance midpoint-voltage and reduce current ripple and voltage ripple. After adding MPPT algorithm, PV system can track the maximum power point more accurately, which owns high stability, high reliability and high energy efficiency.
Keywords: Buck-Boost; Three-level; Pulse Width Modulation; Midpoint-voltage Balance; Mathematical Model; MPPT Algorithm
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