Study Of Grid-Connected Photovoltaic System Based On Z-Source Inverter

The grid-connected photovoltaic system is a type of photovoltaic system development.The traditional inverter is widely used in all kinds of conversions, however, it has conceptualand theoretical barriers and limitations. In order to overcome the problems of thetraditional inverter, a new type inverter named Z-source inverter is presented. It makes theshoot-through state possible by employing a unique impedance Z-network. This uniqueimpedance network allows the Z-source inverter to buck and boost its output voltage.In this paper, the operating principle introduces the buck-boost mechanism of the Z–source inverter first. The advantages of the mechanism can be clearly seen from manyperspectives based on the duality principle. It gives many simulation and experimental resultsto verify the performance and characteristics of the circuit. According to the model, this paperdiscusses the design method of the Voltage-fed Z–source inverter, including the designmethod of main circuit and sampling circuit. Then the control method of the voltage-fedZ-source inverter is discussed. Maximum power output is realized by making use of the mpptcontrol. Grid–connected current tracking a grid connected. frequency and phasic.Grid-connected inverter uses the control of current. The project is a three-cornered wave oftracking current involving operations, control and protection of PV Grid-connected system.Based on TMS320LF2407 DSP chip, richer external circuit is realized. Grid-connectedsystem based on TMS320LF2407 DSP also has strong credibility, high efficiency and goodstability. Finally the results also prove that Grid-connected inverter will improve applicationand expansion of PV Grid-connected power generation system.According to the control of DSP and Experiment circuit, we received experiment wave,its results have verified the feasibility and the correctness of the proposed topology.