TY - GEN
T1 - A new grid-connected PV system based on cascaded H-bridge quasi-Z source inverter
AU - Sun, Dongsen
AU - Ge, Baoming
AU - Peng, Fang Zheng
AU - Haitham, Abu Rub
AU - Bi, Daqiang
AU - Liu, Yushan
PY - 2012
Y1 - 2012
N2 - A new scheme for grid-connected photovoltaic (PV) interface by combination of a quasi-Z source inverter (qZSI) into cascaded H-bridge (CHB) is proposed in this paper. The proposed scheme enables PV string voltage boost to a higher level, and solves the imbalance problem of DC-link voltage in traditional CHB inverters. A multilevel voltage waveform of inverter output is generated by an improved phase shifted sinusoidal pulse width modulation (PS-SPWM) algorithm, which introduces shoot-through states into the conventional zero states to control qZS-CHB module. The effective control schemes are proposed to regulate the maximum power point tracking (MPPT) of each string, and control the DC-link voltage of each H-bridge, respectively. Grid injected power is controlled corresponding to the proportionality factors of each PV string output power. A 1.5 kW system is built in MATLAB/SIMULINK, and the simulation results verify the proposed novel multilevel PV interface inverter and its control principles.
AB - A new scheme for grid-connected photovoltaic (PV) interface by combination of a quasi-Z source inverter (qZSI) into cascaded H-bridge (CHB) is proposed in this paper. The proposed scheme enables PV string voltage boost to a higher level, and solves the imbalance problem of DC-link voltage in traditional CHB inverters. A multilevel voltage waveform of inverter output is generated by an improved phase shifted sinusoidal pulse width modulation (PS-SPWM) algorithm, which introduces shoot-through states into the conventional zero states to control qZS-CHB module. The effective control schemes are proposed to regulate the maximum power point tracking (MPPT) of each string, and control the DC-link voltage of each H-bridge, respectively. Grid injected power is controlled corresponding to the proportionality factors of each PV string output power. A 1.5 kW system is built in MATLAB/SIMULINK, and the simulation results verify the proposed novel multilevel PV interface inverter and its control principles.
UR - https://www.scopus.com/pages/publications/84864856733
U2 - 10.1109/ISIE.2012.6237218
DO - 10.1109/ISIE.2012.6237218
M3 - Conference contribution
AN - SCOPUS:84864856733
SN - 9781467301589
T3 - IEEE International Symposium on Industrial Electronics
SP - 951
EP - 956
BT - Proceedings - 2012 IEEE International Symposium on Industrial Electronics, ISIE 2012
T2 - 21st IEEE International Symposium on Industrial Electronics, ISIE 2012
Y2 - 28 May 2012 through 31 May 2012
ER -