Title :
Research on the Z-source inverter grid-connected control of micro-grid based on differential geometry
Author :
Guo Ke ; Chen Yan ; Zhou Lin ; Gan Yuanxing
Author_Institution :
State Key Lab. of Transm. & Distrib. Equip. & Power Syst. Safety & New Technol., Chongqing, China
fDate :
Aug. 30 2011-Sept. 1 2011
Abstract :
Aiming at the Z-source inverter used in the micro-grid and its grid-connected control research, the photovoltaic system was taken as the example. The inverter integrated three functions including MPPT (Maximum Power Point Tracking), step-up/down DC-side voltage and output grid-connected. In order to overcome the system instability caused by zero point of Z-source net in the right half-plane, the paper proposed nonlinear control method based on differential geometry theoretic, which overcomes the non-minimum phase behavior. When the input condition of the photovoltaic system changes, this control method could make the Z-source inverter DC side output track the MPP rapidly, steadily and little overshoot, and the inverting side output three-phase voltage transmit rapidly and steadily, then improved the quality of grid-connected current. The simulation contrast and experiment result proved the proposed method in the paper is correct and effective.
Keywords :
differential geometry; distributed power generation; invertors; maximum power point trackers; nonlinear control systems; photovoltaic power systems; power distribution control; power grids; MPPT; Z-source inverter grid-connected control; differential geometry; grid-connected current quality; inverting side output three-phase voltage; maximum power point tracking; microgrid; nonlinear control method; nonminimum phase behavior; output grid-connection; photovoltaic system; step-up-down DC-side voltage; Bridge circuits; Control systems; Equivalent circuits; Inverters; Mathematical model; Photovoltaic systems; Differential geometry; Grid-connected; Photovoltaic system; Z-source inverter;
Conference_Titel :
Power Electronics and Applications (EPE 2011), Proceedings of the 2011-14th European Conference on
Conference_Location :
Birmingham
Print_ISBN :
978-1-61284-167-0
Electronic_ISBN :
978-90-75815-15-3