Dynamic Model and Small Signal Analysis of Z-Source Inverter

ABSTRACT

Z-source converters, as one of the most noteworthy power electronic interfaces, have become so popular in the last decade. In this paper, the dynamic model of a three-phase six-switch Z-source inverter is presented. An accurate dynamic model is necessary for both determining the appropriate Z-source inverter with the efficient size of inductor and capacitor and designing the control system which guarantees the stability of the system. In this study, the steady state model and AC small signal analysis were used to obtain the dynamic model. To continue previous studies, in the proposed model, the state variables of the AC side were considered. Therefore, the model was more comprehensive and could be also used for three phase Z-source converter in the inverting mode. To validate the proposed model, the dynamic model was solved by MATLAB and compared with the real circuit implemented in the PSCAD/EMTDC. The simulation results demonstrated the accuracy of the proposed model for the three-phase Z-source inverter.

KEYWORDS:

• Block diagram
• Dynamic model
• Impedance network
• Small signal analysis
• State space model
• Z-Source inverter

DISCLOSURE STATEMENT

No potential conflict of interest was reported by the authors.

Additional information

Notes on contributors

M. Jokar Kouhanjani

Masoud Jokar Kouhanjani was born in Shiraz, Iran. He received the BSc degree in electrical engineering from Shiraz University of Technology, Shiraz, Iran, in 2011 and the MSc degree in electrical engineering (power) from Shiraz University, Shiraz, Iran, in 2014. His research interests include power electronic interfaces, stochastic programming, and electric vehicles.

E-mail: [email protected]

A. R. Seifi

Ali Reza Seifi was born in Shiraz, Iran. He received his BS degree in electrical engineering from Shiraz University, Shiraz, Iran, in 1991, his MS degree in electrical engineering from the University of Tabriz, Tabriz, Iran, in 1993 and PhD in electrical engineering from Tarbiat Modarres University (T.M.U.), Tehran, Iran, in 2001. He is currently the professor in Department of Power and Control Engineering, School of Electrical and Computer Engineering, Shiraz University, Shiraz, Iran. Since 2017, he is working as a visiting professor in Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary. His research interests include energy, energy management, power plant simulations, power systems, electrical machine simulations, power electronics and fuzzy optimization.

M. Mehrtash

Mahdi Mehrtash received the BSc degree in electrical engineering from Shahid Chamran University, Ahvaz, Iran, in 2012 and the MSc degree in electrical engineering (power) from Shiraz University, Shiraz, Iran, in 2014, both with honours. His research interests include electricity market, renewable energy sources, stochastic programming, and electric vehicles.

E-mail: [email protected]