Contrastive Studies of Z-Source Converter and Boost Converter on Photovoltaic Maximum Power Point Tracking System
Abstract Aiming at a series of issues on traditional boost converter which commonly used in photovoltaic maximum power point tracking (MPPT) devices, such as the limited output voltage, the low boost efficiency, the excessive heat generating, this paper proposed a novel z-source converter. Compared with traditional boost converter, several researches have done among topology structure, operational principle, boost factor. Based on the theoretic analysis, this paper given two schemes of photovoltaic MPPT system which using boost converter and z-source converter, the models of them are established based on Matlab. The simulation results indicate that the duty-ratio of photovoltaic MPPT system based on z-source converter is smaller, the stability of MPPT is better. The novel z-source converter can fundamentally solve the issues caused by traditional boost converter in photovoltaic MPPT devices, and it has incomparable advantages than traditional boost converter in the field of photovoltaic power generation.