The Research Of MPPT Control In Solar Based On Passive Lossless Soft-switching

In recent years, due to the increasingly serious energy problems, the use of new energy has been promoted, solar photovoltaic industry has been rapid development. In this paper, solar photovoltaic power generation problems can be explained, and studied its main technical issues, Now focus on DC/DC conversion and maximum power point tracking two aspects in photovoltaic power generation system to study.The main contents of this article are as follows:1.This paper analysis the photovoltaic cell works and its output characteristics. for the non-linear characteristics of output characteristics,it proposes solar maximum power point tracking (MPPT) issues,and analyzes and compares some common maximum power point tracking methods, masters the advantages and disadvantages of several common tracking methods.2. From the PV Boost DC/DC circuit topology to start to study the basic chopper circuit. Introduce the soft-switching structure to the basic chopper circuit,to improve the energy conversion efficiency of the circuit, reduce energy consumption.3. The passive lossless soft-switching unit and Boost Circuit combined to form a photovoltaic DC/DC link circuit, analyze its work process, indicating the feasibility of the circuit in theory. Based on its parameters Selection theory, select a single photovoltaic panels as inputuse Matlab/Simulink to simulate. And do the basic contrast to Boost circuit, analysis simulation results,verify the description:the circuit structure can indeed reduce losses and improve output efficiency. And on this basis, there are under the conditions in the laboratory, I carry on the circuit experiment, grasp the work of the actual circuit, and further verify the feasibility of the circuit structure4. Combine the soft-switching circuit and the solar maximum power point tracking technology together, on the basis of circuit built the model of maximum power point tracking control based on Perturbation and Observation. Use Matlab/Simulink simulate and analysis,to verify the feasibility of the algorithms and circuit, indicating the applicability of the improved circuit.