A New Common Grounded Quasi Z-Source DC-DC converter with Voltage Boosting Feature Applied for T-Type Inverter

This study presents a high step-up Quasi Z-source converter based on T-Type inverter. The proposed converter employs voltage multiplier cell and coupled inductors techniques with one magnetic core to create high voltage levels for inverter. The essential advantage of this converter is that the ground of input voltage source and grid is the same which eliminates the leakage current in Photovoltaic application. Also, the input current of this converter is continuous and the voltage stresses on main power switch and most of diodes are low. The mathematical analysis, operating principle, design consideration and comparison study for proposed converter are investigated and 730W PSCADE EMDCT software simulation results validate the accuracy of proposed converter

High Step-up Common Grounded Switched Quasi Z-Source DC-DC Converter Using Coupled Inductor with Small Signal Analysis

Publisher Copyright: AuthorsIn this article, a new common grounded switched quasi Z-source DC-DC converter is proposed. In the proposed converter, an additional switch and a diode are used compared to the conventional quasi Z-source converter. The proposed converter provides some benefits by using a coupled inductor and switched capacitor unit. These features are providing voltage-boosting capability using a small range of duty cycles, low voltage stress on semiconductors (switches and diodes), and continuous input current waveform. In this topology, the null of the load is connected to the negative terminal of the input DC source, directly. So, the common mode voltage is kept constant. In this case, the proposed DC-DC converter is suitable for photovoltaic (PV) power generation systems to boost the voltage of PV panels. In this paper, the proposed converter and operation modes are described completely. Also, in order to show the advantages and differences of the proposed topology with other DC-DC high-step up converters, a comparative comparison study is considered. Also, the small signal analysis and control strategy of the proposed converter are provided. In addition, design considerations of the used components are given. Then, the power loss analysis of the converter is provided. Finally, in order to prove the accurate performance of the suggested topology and verify the advantages and analysis, an experimental prototype is built at 250 W output power and the related results are provided.Peer reviewe

High Step-up Common Grounded Switched Quasi Z-Source dc-dc Converter Using Coupled Inductor

This paper presents a common grounded switched quasi-Z-source dc-dc converter by using one more power switch and diode in comparison with the conventional quasi-Z-source converter. The presented converter has used coupled inductor and switched capacitor cell in order to reach the following advantages: achieving high voltage gain with a small range of duty cycle, continuous input current, the low voltage stress on power switches, low voltage stress on output diode. These facilities make it reasonable to use in PV system applications to increase the level of the voltage. In this paper, the principle and analysis of operation modes for the presented converter are given and also, the comparison of the presented structure with conventional structures is evaluated. Finally, to certify the performance of the proposed converter and its theoretical relationships, the simulation results of 250 W of the proposed converter are presented