Modeling, analysis and control of buck converter and Z-source converter for photo voltaic emulator

The buck converter and the Z-source converter for emulating the photovoltaic (PV) system is compared in this paper. First, a detail analysis and requirement of the PV emulator is discussed and then the effectiveness of the buck converter and the Z-source converter is studied. The reason of selecting buck converter over the Z-source converter is also explained. The Z-source converter is not an ideal PV emulator as explained by the theoretical and simulation approach presented in the paper. The modeling is done in MATLAB ® Simulink SimPowerSystem software package. The Simulation results obtained from the MATLAB ® Simulink SimPowerSystem software package for different topologies under steady state and dynamic conditions are analyzed and presented. Two different control techniques (current and voltage based) are implemented for the buck converter and based on the simulation analysis the current control technique is selected for the buck converter.