A Simulation Study of a Three Phase Five Level Diode Clamped Inverter with LCL filter for Solar PV based Grid-tied Application
Solar energy is now increasingly being harnessed to fulfill the load requirements of modern power grid. Power converters are employed to convert DC output of a Solar PV array to AC for grid connection. Major factors considered for selection of converters for PV system are efficiency, reliability and cost of the system. Use of multilevel inverters for such applications can enhance the efficiency of the system by reducing losses in the power conversion stage and by improving total harmonic distortion. This paper presents a study on a three phase five level diode clamped inverter for Solar PV based grid-tied application. The main advantage of this topology is its simplicity of control, reduced stress on individual switches and cost effectiveness. Moreover, effect of LCL filter on the output of these multilevel inverters is observed. The Incremental Conductance MPPT algorithm is used to extract maximum power from the DC-DC converter. The 110kW PV system model is developed and simulated using MATLAB/SIMULINK to verify the performance of the inverter.
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