TY - JOUR
T1 - A Six‐Switch Seven‐Level Triple‐Boost Inverter
AU - Chen, Manxin
AU - Chiang Loh, Poh
AU - Yang, Yongheng
AU - Blaabjerg, Frede
PY - 2021/2
Y1 - 2021/2
N2 - Multilevel inverters in renewable applications usually require a high-voltage dc link fed by a front-end dc--dc boost stage. Such a two-stage power conversion, however, increases the switch count, leading to higher costs and power losses. To lower the number of switches, this letter proposes a six-switch inverter, capable of generating a seven-level voltage and a triple-voltage boost. Both features are achieved with only four switches operating at a high frequency while clamped by low-voltage capacitors. The remaining two switches must, however, endure higher voltage stresses but fortunately operate at a much lower frequency. The overall switching losses of the inverter are, thus, significantly reduced. Besides, the inverter shares a common ground between its dc input and ac output, which theoretically helps to eliminate the leakage current, if powered by photovoltaic sources. The operating principles of the inverter have been described and verified through experiments with an 800-W prototype.
AB - Multilevel inverters in renewable applications usually require a high-voltage dc link fed by a front-end dc--dc boost stage. Such a two-stage power conversion, however, increases the switch count, leading to higher costs and power losses. To lower the number of switches, this letter proposes a six-switch inverter, capable of generating a seven-level voltage and a triple-voltage boost. Both features are achieved with only four switches operating at a high frequency while clamped by low-voltage capacitors. The remaining two switches must, however, endure higher voltage stresses but fortunately operate at a much lower frequency. The overall switching losses of the inverter are, thus, significantly reduced. Besides, the inverter shares a common ground between its dc input and ac output, which theoretically helps to eliminate the leakage current, if powered by photovoltaic sources. The operating principles of the inverter have been described and verified through experiments with an 800-W prototype.
KW - Boost multilevel inverter (MLI)
KW - common-grounded (CG) structure
KW - low switch count
KW - renewable applications
UR - http://www.scopus.com/inward/record.url?scp=85092724743&partnerID=8YFLogxK
U2 - 10.1109/TPEL.2020.3010010
DO - 10.1109/TPEL.2020.3010010
M3 - Journal article
SN - 0885-8993
VL - 36
SP - 1225
EP - 1230
JO - I E E E Transactions on Power Electronics
JF - I E E E Transactions on Power Electronics
IS - 2
M1 - 9143454
ER -