Research on new type photovoltaic grid-connected inverter in distributed power supply network
The grid-connected inverter plays a key connection role in the distributed power supply system taking the photo-voltaic power generation as the electric power source,which can invert the electric power generated by the photovoltaic array in-to the voltage and current which have the same frequency and same phase with the electric power network voltage,so as to guar-antee the normal operation of the photovoltaic power generation system and electric power network. Since the traditional grid-con-nected inverter has the problems of serious common-mode leakage current,secondary pulsation of the neutral point potential and too much secondary harmonic content of the conversion voltage,a new type single-phase inverter without isolation transformer structure was designed to improve the invertion performance of the grid-connected inverter. The working mechanisms of the DC converting circuit and DC-AC converting circuit modules of the new type grid-connected inverter are analyzed. The voltage pro-cessing effect of the new type grid-connected inverter on the photovoltaic array is compared with that of the traditional one by the simulation mode. The result shows that the secondary harmonic content of the output inverting voltage of the new type inverter is decreased by 54.87%. The inverter has good invertion function.
distributed power supplyphotovoltaic arraygrid-connected invertersecond harmonic
国家科技期刊平台
NSTL
万方数据
维普
