Single-stage energy converters, in particular, the Z-Source Inverter (ZSI) or impedance source inverter, has gained significant attention in the recent years. ZSI ensures flexible energy conversions (dc–dc, dc–ac, ac–ac and ac–dc) because of its unique ability to boost the output voltage in typical renewable energy systems. The impedance network integrated between the energy source and the load contributes to the unique functionality of the ZSI. As substantial research has been conducted on the ZSI, this article provides a review on the operation of ZSI. The article initially examines the various topologies commonly adopted for the application of the ZSI. Subsequently, details of the various modulation methods that are commonly used to obtain the voltage boosting using ZSI are documented. Additionally, the phenomenon of neutral point formation, which is an important impediment to the adoption of multilevel ZSIs and the limitation of the modulation methods, is explained.
Ali, U. S. and Kamaraj, V. (2011). A novel space vector PWM for Z-source inverter. Electrical Energy Systems (ICEES), In: 2011 1st International Conference on, 2011. IEEE, 3–5 January 2011, Newport Beach, CA, USA, pp. 82–85.
António-Ferreira, A., Collados-Rodríguez, C. and Gomis-Bellmunt, O. (2018). Modulation Techniques Applied to Medium Voltage Modular Multilevel Converters for Renewable Energy Integration: A Review. Electric Power Systems Research, 155, pp. 21–39.
Banerjee, D. and Ranganathan, V. (2009). Load- Commutated SCR Current-Source-Inverter-Fed Induction Motor Drive with Sinusoidal Motor Voltage and Current. IEEE Transactions on Power Electronics, 24, pp. 1048–1061.
Financed by the National Centre for Research and Development under grant No. SP/I/1/77065/10 by the strategic scientific research and experimental development program:
SYNAT - “Interdisciplinary System for Interactive Scientific and Scientific-Technical Information”.