Photovoltaic Power Generation System Based on Modular Multilevel Converter
Modular multilevel converter has the advantages of high power factor,low harmonic content of output current,convenient expansion method of power and voltage level,high reliability and so on.Therefore,it is widely used in the field of new energy power generation.This paper introduces a photovoltaic power generation system com-posed of photovoltaic cell array,energy storage battery,DC converter and modular multilevel converter and four operat-ing conditions.Then,the maximum power tracking technology of variable step perturbation and observation method,the charge and discharge control technology of energy storage battery,the modular multilevel converter and its control technology are introduced.Through simulation,the feasibility of the four operating conditions of the photovoltaic power generation system of the modular multilevel converter and the effectiveness of the control strategies of each unit are verified.At the same time,the power balance control can be carried out through the energy storage battery to maintain the power balance transmitted to the power grid.The photovoltaic power generation system and its control technology provide technical support for the field of new energy power generation.
Photovoltaic power generationMaximum power point trackingEnergy storage batteryPower balanceModular multilevel converter
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