الفهرس 
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Abstract
Power generated from renewable sources is either connected to the grid or to the local loads through inverters. Renewable energy generation, such as PV, wind power, and waves power are prospective applications of Z-source converters because of the unique voltage buck–boost ability with minimum component count and potential low cost. In addition to small passive components, high performance and power density, the new power electronic devices have less loss. Z-source converters can be used as advance topologies for various applications.
The aim of this thesis is to investigate the ability of advanced inverters to overcome the problems of conventional inverter. Conventional inverter has many problems such as dead-beat compensation, steeping problem, and miss-gating problem. In addition, Z-source inverter and Quasi Z- inverter are analyzed in case of small duty has high voltage gain. Three pulse-width modulation (PWM) techniques of Z- source inverter are analyzed and compared; Simple boost PWM, maximum boost PWM and (SVPVM) space vector PWM methods. The boost gain, voltage output gain and switches stress equations of each method are deduced. The performance of the three pulse width modulation methods is evaluated under different load conditions and variable input voltage. Simulation work is carried out using MATLAB/Simulink package to evaluate the proposed method performance.
The simulation results have shown the success of using these suggested methods constant voltage and in the case of variable voltage of renewable energy sources.