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Bo Liu,Xu Yang,Yan Zhang,Haizhong Ye,Fanlin Kong 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
In this paper, a new control strategy that combines Proportion Integrity (PI) with quasi-Proportion Resonant (PR) control under d-q rotate frame is proposed for three phase grid-connected photovoltaic inverter to achieve the zero error tracking of fundamental current as well as to suppress the selected harmonics current. Also, grid voltage feed forward is used to enhance the dynamic response and disturbance rejection capability. Finally, the proposed strategy is implemented on a 100 ㎾ PV array grid-connected inverter with 1.21% THD of grid current at 80㎾ output and 7th harmonics reduced by more than half. The experimental result shows that the proposed control strategy has good performance in fundamental current tracking and harmonics current rejection.
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The Waveform Model of Laser Altimeter System with Flattened Gaussian Laser
Ma Yue,Wang Mingwei,Yang Fanlin,Li Song 한국광학회 2015 Current Optics and Photonics Vol.19 No.4
The current waveform model of a laser altimeter is based on a Gaussian laser beam of fundamentalmode, while the flattened Gaussian beam has many advantages such as nearly constant energy distributionon the center of the cross-section. Following the theory of the flattened Gaussian beam and the waveformtheory of the laser altimeter, some of the primary parameters of the received waveform were derived, anda laser altimetry waveform simulator and waveform processing software were programmed and improvedunder the circumstance of a flattened Gaussian beam. The result showed that the bias between theoreticaland simulated waveforms was less than 3% for every order mode, the waveform width and range errorwould increase as target slope or order number rose. Under higher order mode, the shapes of the receivedwaveforms were no longer Gaussian, and could be fitted more precisely as a generalized Gaussian functionwith power bigger than 2. The flattened beam got much better performance for a multi-surface target,especially when the small surface is far from the center of the laser footprint. This article provides thewaveform theoretical basis for the use of a flattened Gaussian beam in a laser altimeter
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