Dynamic Characteristics Study Of Photovoltaic Generation MPPT System Based On Error Adjustment

With increasingly shortage of traditional energy and serious environmental pollution, the photovoltaic industry has been developed, and photovoltaic technology has been the research hotspot. In order to improve the efficiency of photovoltaic generation system and reduce generation cost, developing a kind of maximum power point tracking(MPPT) algorithm with good dynamic and static performance has been the unremitting pursuit of people. In this paper, from the perspective of impendence matching, the equivalent impendence matching method(EIM) is studied, and the MPPT system which is based on EIM algorithm is researched.Firstly, the principle and characteristics of EIM algorithm are described in detail, and the difference between EIM and INC algorithm is pointed out. EIM algorithm is based on impendence transfer function to realize system correction, so the input impendence model of Boost converter at maximum power point is established, and the circuit factors that affect the accuracy of model are discussed. By simulating in time-domain and frequency-domain, the simulation results verify the correctness of impendence model.Secondly, dynamic correction of MPPT system based on EIM method is made, and system simulation results show the effectiveness of EIM method. By comparing EIM with P&O and INC algorithm through simulation, the advantages of EIM are verified.Finally, the experimental platform of MPPT system is constructed, and the test based on experimental device is carried out, then the correctness of theory analysis above is proved by the test results. By making a comparison of EIM with P&O and INC algorithm through the experiment, the superiority of EIM method in dynamic and static performance is examined.