Title :
Improved modulation techniques to eliminate leakage ground currents in three-phase photovoltaic systems
Author :
Hao Huang ; Wenjie Chen ; Xiaomei Song
Author_Institution :
State Key Lab. of Electr. Insulation & Power Equip., Xi´an Jiaotong Univ., Xi´an, China
Abstract :
Nowadays transformerless PV converters are widely used in the energy conversion stage of a PV plant, because their good characteristics regarding efficiency, size, cost and weight. The main problem in transformerless PV systems is the common mode voltage variations that can generate leakage ground currents through the parasitic capacitance formed between the PV panels and ground. This paper comparisons the performance characteristic of conventional space vector PWM (SVPWM), AZSPWM, NSPWM and RSPWM. Based upon that, an improved AZSPWM scheme is proposed. Theoretical analysis is verified via simulation by means of MATLAB/SIMULINK.
Keywords :
PWM power convertors; leakage currents; photovoltaic power systems; AZSPWM scheme; Matlab-Simulink; NSPWM; PV panels; PV plant; RSPWM; SVPWM; common mode voltage variations; energy conversion stage; improved modulation techniques; leakage ground current elimination; parasitic capacitance; space vector PWM; three-phase photovoltaic systems; transformerless PV converters; Inverters; Leakage currents; Parasitic capacitance; Space vector pulse width modulation; Vectors;
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2014 Twenty-Ninth Annual IEEE
Conference_Location :
Fort Worth, TX
DOI :
10.1109/APEC.2014.6803692
