Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 33, Issue 1, Pages 606-628Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2017.2661321
Keywords
Closed-loop control; dc/ac conversion; minimum switching frequency; pulse-width modulation (PWM) strategy; voltage gain; Z-source inverter
Categories
Funding
- State Key Laboratory of Electrical Insulation and Power Equipment [EIPE14112, EIPE16310]
- Power Electronics Science and Education Development Program of Delta Environmental and Educational Foundation [DREG2016010]
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Z-source inverter provides a competitive single-stage dc-ac power conversion with the capability of both buck and boost voltage regulation. In order to maximize voltage gain and to increase efficiency, this paper proposes an improved pulse-width modulation (PWM) strategy. By adjusting the shoot-through duty ratio of one-phase leg, it regulates the average value of intermediate dc-link voltage, which is the same as the instantaneous maximum of three-phase line voltage in one switching time period (T-s). And the other two-phase legs maintain the fixed switching states. Thus, the equivalent switching frequency of power devices in the inverter bridge is reduced to 1/3f(s) (f(s) is the frequency corresponding to T-s ). The operating principles and closed-loop controller design are analyzed and verified by simulation and experiments. Compared with the existing PWM strategies, the improved PWM (IPWM) strategy demonstrates higher efficiency under full operation range of low voltage gain (1.27-2) application. However, with the IPWM strategy, the inductor current and capacitor voltage contain sixtime-line-frequency ripples, which consequently require large size of the passive components when the output frequency is very low. Thus, it is also suitable for 400-800-Hz medium frequency aircraft and vessel power supply system due to a relatively high output line frequency. Furthermore, the idea of IPWM strategy can be extended to other kinds of three-phase impedance network-based inverters.
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