A New Grid-Connected PV System Based on Cascaded H-bridge Quasi-Z Source Inverter Conference Paper uri icon

abstract

  • 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. 2012 IEEE.

name of conference

  • 2012 IEEE International Symposium on Industrial Electronics

published proceedings

  • 2012 IEEE INTERNATIONAL SYMPOSIUM ON INDUSTRIAL ELECTRONICS (ISIE)

author list (cited authors)

  • Sun, D., Ge, B., Peng, F. Z., Haitham, A. R., Bi, D., & Liu, Y.

citation count

  • 74

complete list of authors

  • Sun, Dongsen||Ge, Baoming||Peng, Fang Zheng||Haitham, Abu Rub||Bi, Daqiang||Liu, Yushan

publication date

  • May 2012