A Photovoltaic-Fed Z-Source Inverter Motor Drive with Fault-Tolerant Capability for Rural Irrigation

Vivek Sharma, M. J. Hossain, S. M. Nawazish Ali and Muhammad Kashif
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Vivek Sharma: School of Engineering, Macquarie University, Sydney NSW 2109, Australia
M. J. Hossain: School of Electrical and Data Engineering, University of Technology Sydney, Ultimo NSW 2007, Australia
S. M. Nawazish Ali: School of Engineering, Macquarie University, Sydney NSW 2109, Australia
Muhammad Kashif: School of Engineering, Macquarie University, Sydney NSW 2109, Australia

Energies, 2020, vol. 13, issue 18, 1-19

Abstract: In recent years, photovoltaic (PV) systems have emerged as economical solutions for irrigation systems in rural areas. However, they are characterized by low voltage output and less reliable configurations. To address this issue in this paper, a promising inverter configuration called Impedance (Z)-source inverter (ZSI) is designed and implemented to obtain high voltage output with single-stage power conversion, particularly suitable for irrigation application. An improved and efficient modulation scheme and design specifications of the network parameters are derived. Additionally, a suitable fault-tolerant strategy is developed and implemented to improve reliability and efficiency. It incorporates an additional redundant leg with an improved control strategy to facilitate the fault-tolerant operation. The proposed fault-tolerant circuit is designed to handle switch failures of the inverter modules due to the open-circuit and short-circuit faults. The relevant simulation and experimental results under normal, faulty and post-fault operation are presented. The post-fault operation characteristics are identical to the normal operation. The motor performance characteristics such as load current, torque, harmonic spectrum, and efficiency are thoroughly analysed to prove the suitability of the proposed system for irrigation applications. This study provides an efficient and economical solution for rural irrigation utilized in developing countries, for example, India.

Keywords: fault-tolerant; open-circuit fault; short-circuit fault; induction motor drive; Z-source network; inverter; photovoltaic (PV); Insulated-gate bipolar transistor (IGBT) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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Citations: View citations in EconPapers (3)

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