An Improved Quasi-Z-Source Three-Level T-Type Inverter and Its Modulation Scheme
Authors:
- 1 March 2020
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- p. 412-416
Abstract
Conventional quasi-Z-source (qZS) three-level T-type inverter (3LT 2 I) has both boost and buck functions, and the boost function is achieved by the shoot-through state. However, the shoot-though state can be only inserted into the zero vectors, which would jeopardize the nearest three vectors synthesis method in space vector modulation (SVM), degrading the quality of the multilevel waveform. In this paper, the topology of qZS-3LT 2 I is improved, so that the shoot-through state can be inserted into not only zero vectors, but also small vectors. Accordingly, the nearest three vectors synthesis method in SVM is valid. And the third harmonic injection pulse width modulation (THIPWM) become available. By properly arranging the shoot-through state, no extra additional switching times will be introduced. A 3.5-kW prototype was built, and the experimental results confirm the theoretical expectation.Keywords
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