TY - GEN
T1 - A common-ground single-phase five-level transformerless boost inverter for photovoltaic applications
AU - Shaffer, Ben
AU - Hassan, Hassan A.
AU - Scott, Mark J.
AU - Hasan, Saad Ul
AU - Town, Graham E.
AU - Siwakoti, Yam
PY - 2018
Y1 - 2018
N2 - This paper presents a transformerless five-level boost inverter with common ground connection for single-phase photovoltaic (PV) systems. It consists of nine switches, two capacitors, and an LC filter at the output. The topology eliminates common mode (CM) leakage current by connecting the negative terminal of the PV directly to the neutral point of the grid, which bypasses the PV array's stray capacitance. As compared to the conventional flying capacitor (FC) multilevel inverter and the cascaded H-bridge (CHB) multilevel inverter, the proposed topology achieves an output voltage that is up to four-times higher given an equivalent dc-link voltage. This reduces the dc-link voltage requirement to one fourth of the values used in conventional multilevel inverters (FC, CHB, NPC, ANPC) and one half of the conventional H-bridge topologies. The following manuscript presents the operation principles and theoretical analysis of the proposed topology, which are supported by simulation and experimental results. A 1 kW prototype was constructed; it achieves 96 % efficiency operating at an output of 240 VAC, 60 Hz, and 973 W.
AB - This paper presents a transformerless five-level boost inverter with common ground connection for single-phase photovoltaic (PV) systems. It consists of nine switches, two capacitors, and an LC filter at the output. The topology eliminates common mode (CM) leakage current by connecting the negative terminal of the PV directly to the neutral point of the grid, which bypasses the PV array's stray capacitance. As compared to the conventional flying capacitor (FC) multilevel inverter and the cascaded H-bridge (CHB) multilevel inverter, the proposed topology achieves an output voltage that is up to four-times higher given an equivalent dc-link voltage. This reduces the dc-link voltage requirement to one fourth of the values used in conventional multilevel inverters (FC, CHB, NPC, ANPC) and one half of the conventional H-bridge topologies. The following manuscript presents the operation principles and theoretical analysis of the proposed topology, which are supported by simulation and experimental results. A 1 kW prototype was constructed; it achieves 96 % efficiency operating at an output of 240 VAC, 60 Hz, and 973 W.
KW - Common mode (CM) current
KW - photovoltaic (PV) system
KW - switched capacitor
KW - transformerless inverter
KW - virtual DC bus
UR - http://www.scopus.com/inward/record.url?scp=85046958831&partnerID=8YFLogxK
U2 - 10.1109/APEC.2018.8341037
DO - 10.1109/APEC.2018.8341037
M3 - Conference proceeding contribution
AN - SCOPUS:85046958831
SN - 9781538611814
SP - 368
EP - 374
BT - The 2018 IEEE Applied Power Electronics Conference and Exposition (APEC) proceedings
PB - Institute of Electrical and Electronics Engineers (IEEE)
CY - Piscataway, NJ
T2 - 33rd Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2018
Y2 - 4 March 2018 through 8 March 2018
ER -