Research On Control Strategy Of Grid-connected Inverter

A novel circuit of grid-connected inverter based on DSPTMS320F2407 is proposed in this paper. In order to make the power balance between the input and the output, the control strategy of bus voltage is applied. Meanwhile, this equipment can also be used as feedback type electronic load. This circuit realize simpleness, intelligence, low cost.Firstly, prospects of the energy were presented. As the limit of traditional energy development, the photovoltaic becomes more and more important. This paper mainly research on the grid-connected inverter as the key component of a photovoltaic system. The principles and characteristics of traditional grid-connected inverter are analyzed. Basically, a novel grid-connected inverter is presented, which achieve power balance between input and ouput.This paper put emphasis on the circuit topology and control strategy of this novel current-source grid-connected inverter. It illuminates the advantages of the main topology different from other topologies. Furthermore, the filter and control parameters are given in detail. Based on these analyses, the simulation model of system is established and the experiment is carried out.Then the pulse width modulation technique is introduced. Based on analysis of respective operation principle of the bipolar and single-polar SPWM. Both the simulation and experimental results are given to verify that the bipolar SPWM generation scheme is more preferable. Then a control system is designed based on a digital signal processor-TMS320F2407. The DSP' s hardware and software configurations are calculated on the equipment for testing. Finally, a 1KV prototype is made on the research above. Validity of the feasibility of inverter is shown by simulation and experimental results.