A Comprehensive Review of basic Switching Patterns for Three-Phase Impedance-Source Inverters
Subject Areas : مهندسی برق و کامپیوتر
E. Shokati Asl
1
*
,
M. Hasan Babayi Nozadian
2
1 - Department of Energy, Materials and Energy Research Center, Karaj, Iran
2 - Department of Electrical Engineering, Faculty of Engineering, Bu-Ali Sina University, Hamedan, Iran
Keywords: Z-source inverter, simple boost control method, maximum constant boost control method, third harmonic injection, modulation index, voltage gain,
Abstract :
The most basic method for controlling impedance-source inverters is the simple boost control method. Besides the simple boost control method, several other control strategies have been developed, including the maximum boost control method, the maximum boost control method with third-harmonic injection, the maximum constant boost control method, and the maximum constant boost control method with third-harmonic injection.
Compared with the simple boost control method, the maximum boost control method provides a wider operating range. However, in this method, the inductor current and capacitor voltage exhibit significant low-frequency ripple in addition to the high-frequency ripple. To reduce the size and cost of the impedance-source network, these low-frequency ripples must be eliminated. For this purpose, the maximum constant boost control method is employed.
Moreover, third-harmonic injection can be incorporated into the maximum constant boost control method to further extend the modulation index range. In this paper, the switching methods of simple boost, maximum boost, maximum boost with third-harmonic injection, maximum constant boost, and maximum constant boost with third-harmonic injection are presented in detail, and the advantages and disadvantages of each method are discussed. Finally, simulation results obtained using PSCAD/EMTDC are provided to validate the accuracy of the reviewed control methods.
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