Research On DMPPT Control Strategy Based On DC/DC Converter

With the acceleration of economic globalization and the rapid development of industrial economy,the energy shortage and environmental pollution have become the two important factors that restrict the sustainable development of human society.Photovoltaic power generation is becoming more and more important technology development direction both at home and abroad because of its advantages of no pollution and simple maintenance.When the centralized photovoltaic power generation system is shadowed,power mismatch occurs and the whole system power generation efficiency is reduced.The distributed photovoltaic power system is used to solve the problem of power mismatch in shadow occlusion.The research background,current status of the topic and the important theoretical and practical significance of the topic are introduced.According to the working principle of photovoltaic cells,the simulation model of photovoltaic cell is established and its output characteristics are analyzed.In series and parallel structure of photovoltaic modules,according to the output characteristics of the photovoltaic cells in series and in parallel under shadow shielding,the process and principle of photovoltaic cell power mismatch under the condition of partial shadow shading is analyzed.The topology and working process of the main circuit DC/DC converter in the photovoltaic power optimizer are introduced and analyzed.The working principle of the maximum power of the photovoltaic array based on the DC/DC converter is analyzed.To solve the problem of power mismatch caused by shadow shading,an improved distributed photovoltaic system optimization control strategy is proposed to solve this problem.The maximum power point tracking algorithm selects a control method that combines genetic algorithm and adaptive area difference method.The simulation models of the centralized photovoltaic power generation system and the distributed photovoltaic power generation system under partial shadow shading are constructed respectively,and the power output under the two structures is compared to verify that the distributed photovoltaic power generation system can solve the power mismatch caused by shadow shading.