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

作者:Sun Dongsen*; Ge Baoming; Peng Fang Zheng; Haitham Abu Rub; Bi Daqiang; Liu Yushan
来源:21st IEEE International Symposium on Industrial Electronics (ISIE), 2012-05-28 to 2012-05-31.

摘要

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.