Design And Analysis Of Photovoltaic System Using Z-Source Inverter (T-0447) (MFN 8329)

Abstract

ABSTRACT Inthis thesis,we analyzed the four topologies of single-phase impedance source inverter namely Z-source converter, quasiZ source converter, Y-source converter and quasi Y-source converter using simple boost control technique for photovoltaic(PV) on the bases of voltage stress, voltage regulation, total harmonic distortion (THD), capacitor rating, number of components count and efficiency. Unlike traditional two-stage DC-DC booted power converter/inverter, these four topologies converted the source Dcpower to Acpower in one step of operation. Like traditional DC/DC converter all these four converters have two modes of working process, shoot- through modes and non- shoot- through modes or active modes. The unique features of thesetopologies are the load voltage could be set to any desired value by controlling the control parameters i.e. modulation index (M) and shoot- through duty period (D), in addition winding-factor in case of Y-source converter and quasi Y-source converter. All these topologies have unique structure and it consists of supply voltage, unique impedance source network and H-bridge converter. The input supply voltage could be fuel cell, battery, high rating capacitor or photovoltaic (PV) cell. The H-bridge converter is made ofsemi-conductor devices like IGBTs, MOSFETs, SCR and BJTs. The Z source networks is made of coupling inductor and capacitor. All theseimpedance source converters overcome the barrier and limitation which comes in traditional DC/DC converter. Furthermore, these types of converters can be employed to any category of power alteration topology such asAC/DC converter (bridge rectifier), DC/AC converter (inverter), DC/DC converter (chopper), and AC/AC converter(cyclo-converter). Finally, we investigated thecomparison between ZSI and Y-source converter, between q-ZSI and q-YSIand overall comparison among these four topologies is a part of this thesis.The performance of the Z-source topologies is carried out in MATLAB Simulink environment in order to validate the system performance of single-stage proposed networks