This study proposes a new topology of cascaded transformer-based multilevel inverter using single Z-source. The suggested circuit consists of only one Z network and one DC voltage source; as a result installation area is reduced. In this topology, the output voltage amplitude is not limited to DC voltage source similar to traditional cascaded transformer-based multilevel inverter and can be increased with Z network shoot-through state control flexibly. Besides, the same as traditional Z-source inverter, it is more reliable against short circuit. Also, a particular switching algorithm has been suggested for presented inverter, which can obtain total harmonic distortion (THD) of output voltage nearly constant for different boost ratio. Moreover, as compared to traditional Z-source inverter, the THD of output voltage is decreased in the suggested topology. The performance of proposed inverter and switching algorithm are validated with simulation results using MATLAB/SIMULINK software and experimental results based PCI-1716 data acquisition system.

This study combines quasi-Z-source into the five-level inverter using coupled inductors. The suggested circuit consists of only one dc voltage source, one quasi-Z-network, six power switches and only one set of coupled inductors. In this topology, the output voltage amplitude is not limited to dc voltage source and it is reliable and higher efficiency because of quasi-Z-network presence. This study also proposes new switching algorithms for the inverter based on pulse width modulation (PWM) and space vector control (SVC) algorithms, which cause boosting capability of output voltage with low total harmonic distortion (THD). This PWM algorithm is particular one, which calculates dwelling time for each switch in every sample time. The proposed SVC algorithm generates a voltage vector with very low harmonic distortion and reduced switching frequency. The performance of proposed inverter and switching algorithm are validated with simulation results using MATLAB/SIMULINK software and experimental results based PCI-1716 data acquisition system. These results demonstrate the proposed inverter with suggested algorithm can generate a wide range of load voltage.

This paper suggests quinary asymmetric inverter with coupled inductors and transformer, and uses it in hybrid system including photovoltaic (PV) and wind. This inverter produces twenty-five-level voltage in addition to merits of multilevel inverter, has only one DC source. Then, it is adequate for hybrid systems, which prevents increasing DC-link and makes control of system easy. Proposed structure also provides isolation in the system and the switch numbers are reduced in this topology compared with other multilevel structures. In this system, battery is used as backup, where PV and wind have complementary nature. The performance of proposed inverter and hybrid system is validated with simulation results using MATLAB/SIMULINK software and experimental results based PCI-1716 data acquisition system. Ó 2015 Faculty of Engineering, Ain Shams University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

This paper proposes two advanced algorithms for multilevel Z-source inverter (MLZSI), which employ space vector control (SVC) as control algorithm of cascaded H-bridge multilevel Z-source inverter; where output voltage is achieved by summing the output voltages of bridge. In these algorithms different states to generate the same voltage with low THD, as the purpose, are verified and the suitable one is selected. This method is simple and has appropriate performance, where sample time is set quietly. Use of Z-network allows the inverter to generate a wide range of output voltage with high reliability. The accuracy of suggested algorithms is validated with simulation results using MATLAB/SIMULINK software and experimental results based PCI-1716 data acquisition system. Ó 2015 Faculty of Engineering, Ain Shams University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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