TY - JOUR
T1 - Leakage Current Reduction of Three-phase Z-Source Three-level Four-Leg Inverter for Transformerless PV system
AU - Guo, Xiaoqiang
AU - Yang, Yong
AU - Wang, Baocheng
AU - Blaabjerg, Frede
PY - 2019/7
Y1 - 2019/7
N2 - 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 overcurrent 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.
AB - 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 overcurrent 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.
KW - four-leg inverter
KW - leakage current
KW - three-level inverter
KW - Z source inverter
UR - http://www.scopus.com/inward/record.url?scp=85055054776&partnerID=8YFLogxK
U2 - 10.1109/TPEL.2018.2873223
DO - 10.1109/TPEL.2018.2873223
M3 - Journal article
AN - SCOPUS:85055054776
SN - 0885-8993
VL - 34
SP - 6299
EP - 6308
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
IS - 7
M1 - 8496776
ER -