TY - GEN
T1 - Front-end isolated quasi-Z-source DC-DC converter modules in series for photovoltaic high-voltage DC applications
AU - Liu, Yushan
AU - Abu-Rub, Haitham
AU - Ge, Baoming
N1 - Publisher Copyright:
© 2016 IEEE.
PY - 2016/5/10
Y1 - 2016/5/10
N2 - A quasi-Z-source modular cascaded converter (qZS-MCC) is proposed for high-voltage (HV) dc integration of photovoltaic (PV) power. The qZS-MCC comprises front-end isolated qZS half-bridge (HB) dc-dc converter submodules (SMs) in series. By the qZS-HB handling PV voltage and power variations, a unified duty cycle is applicable for the front-end isolation converter of all SMs. Resultantly, the proposed system improves the quasi-Z-source cascaded multilevel inverter and the modular multilevel converter based PV counterparts in terms of no double-line-frequency pulsating power so as to low qZS impedance, HV dc collection of PV power thus to reduce conversion stages for dc transmission, and overcoming the limit of series-output voltage with simple galvanic isolation. Operating principle and power loss evaluation of the qZS-MCC are presented. Parameter design guidelines and simulation are addressed based on a 60-kW SM; experimental results are carried out on a downscaled prototype as a proof-of-concept, demonstrating the validity of the proposed system.
AB - A quasi-Z-source modular cascaded converter (qZS-MCC) is proposed for high-voltage (HV) dc integration of photovoltaic (PV) power. The qZS-MCC comprises front-end isolated qZS half-bridge (HB) dc-dc converter submodules (SMs) in series. By the qZS-HB handling PV voltage and power variations, a unified duty cycle is applicable for the front-end isolation converter of all SMs. Resultantly, the proposed system improves the quasi-Z-source cascaded multilevel inverter and the modular multilevel converter based PV counterparts in terms of no double-line-frequency pulsating power so as to low qZS impedance, HV dc collection of PV power thus to reduce conversion stages for dc transmission, and overcoming the limit of series-output voltage with simple galvanic isolation. Operating principle and power loss evaluation of the qZS-MCC are presented. Parameter design guidelines and simulation are addressed based on a 60-kW SM; experimental results are carried out on a downscaled prototype as a proof-of-concept, demonstrating the validity of the proposed system.
KW - dc-dc power conversion
KW - galvanic isolation
KW - Photovoltaic power system
KW - quasi-Z-source converter
UR - http://www.scopus.com/inward/record.url?scp=84973595134&partnerID=8YFLogxK
U2 - 10.1109/APEC.2016.7468023
DO - 10.1109/APEC.2016.7468023
M3 - Conference contribution
AN - SCOPUS:84973595134
T3 - Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
SP - 1214
EP - 1219
BT - 2016 IEEE Applied Power Electronics Conference and Exposition, APEC 2016
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 31st Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2016
Y2 - 20 March 2016 through 24 March 2016
ER -