Enhanced Zeta Converter Topology for High Voltage Conversion in PV Connected Grid Systems

Abstract

A DC-DC converter known as a "zeta converter" can be used in various power electronics applications to offer a voltage step-up (boost) or step-down (buck) function. The circuit became more complicated due to the numerous switched capacitor cells needed for the vast step-up conversion. Therefore, the research presents an advanced high step-up Zeta converter explicitly designed for photovoltaic (PV) applications, particularly in grid-connected systems where solar energy production can fluctuate. This improved converter maximises system efficiency and energy production by effectively controlling a broad input voltage range while optimising energy extraction from the PV array. It has near-unity power factor correction, which enhances power quality and makes grid integration easier by adjusting the input current to match the input voltage. The design minimises voltage spikes, switching noise, and electromagnetic interference (EMI) by utilising zero-voltage switching (ZVS) and interleaved operation. This improves system reliability and complies with regulatory standards for electromagnetic compatibility. Furthermore, a proportional-integral-differential (PID) controller maximises voltage output by lowering component stress and increasing overall efficiency. As a result, the implementation includes significant results such that the output voltage of 513V, output current of 9.15A, power of 4693W and a power factor of 98.7, THD waveform based on voltage, current are 0.0009 volts, 0.01157 amperes. Due to its efficiency, adaptability, and simplicity, the converter is a valuable tool for many applications beyond grid-connected photovoltaic systems. This helps to promote sustainable energy development and the integration of renewable energy sources.