School of Automation and Electrical Engineering Lanzhou Jiaotong University Lanzhou 730070;
School of Automation and Electrical Engineering Lanzhou Jiaotong University Lanzhou 730070;
Automatic Control Research Institute Lanzhou Jiaotong University Lanzhou 730070;
Frequency of harmonic distortion; fuzzy proportional complex integral; inductance-capacitance-inductance(LCL) filtering circuit photovoltaic grid-connection; quasi-Z source inverter;