Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 34, Issue 7, Pages 6299-6308Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2018.2873223
Keywords
Four-leg inverter; leakage current; three-level inverter; Z-source inverter (ZSI)
Categories
Funding
- National Natural Science Foundation of China [51677161, 51777181]
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment [EERIKF2018002]
- Hebei University of Technology
- Hundred Excellent Innovation Talents Support Program of Hebei Province [SLRC2017059]
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Leakage current reduction is one of the important issues for transformerless photovoltaic (PV) systems. Many interesting solutions have been reported to reduce the leakage current for three-phase PV inverters. However, most of them are limited to two-level inverters. Moreover, there is a potential risk of the over-current phenomenon. In order to solve the problem, a Z-source three-level four-leg inverter with a new modulation strategy is proposed in this paper. First, the mathematical modeling of the three-level four-leg Z-source inverter for leakage current reduction is established for the first time. Second, a new carrier-based modulation strategy is proposed by utilizing the effective large, medium, small, and zero vectors, instead of the invalid vectors, to achieve the constant common-mode voltage, as well as the leakage current suppression. Finally, the proposed solution is carried out on the Texas Instruments TMS320F28335 DSP + Xilinx XC3400 field-programmable gate array digital control hardware platform. The experimental results verify the effectiveness of the proposed solution.
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