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Karunamoorthy, B.
- Modeling and Control of Grid-Connected Three Phase Inverters
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Authors
Affiliations
1 Department of Electrical and Electronics Engineering, Kumaraguru College of Technology, Coimbatore, IN
2 Department of Electronics and Communication Engineering, Adithya Institute of Technology, Coimbatore, IN
3 Kumaraguru College of Technology, Coimbatore, IN
1 Department of Electrical and Electronics Engineering, Kumaraguru College of Technology, Coimbatore, IN
2 Department of Electronics and Communication Engineering, Adithya Institute of Technology, Coimbatore, IN
3 Kumaraguru College of Technology, Coimbatore, IN
Source
Programmable Device Circuits and Systems, Vol 4, No 2 (2012), Pagination: 95-99Abstract
This paper analyses the stability problem of grid connected inverter. Distributed generation (DG) systems are usually connected to the grid using power electronic converters. Power delivered from such DG sources depends on factors like energy availability and load demand. The converters used in power conversion do not operate with their full capacity all the time. The unused or remaining capacity of the converters could be used to provide some ancillary functions like harmonic and unbalance mitigation of the power distribution system. As some of these DG sources have wide operating ranges, they need special power converters for grid interfacing. Being a single-stage buck-boost inverter, recently proposed Z-source inverter (ZSI) is a good candidate for future DG systems. This paper presents a controller design for a ZSI-based DG system to improve power quality of distribution systems. Due to the variation of grid impedances, the system gets affected by stability problems. Since the grid impedance varies, the system tends to be unstable. In this control strategy, the inverter is controlled by means of robust H∞ controller along with stability is analyzed. An inner inverter-output-current loop with high bandwidth is also designed to get better disturbance rejection capability. The selection of weighting functions, inner inverter-output-current loop design, and system disturbance rejection capability are discussed in detail in this paper. The proposed control method is tested with simulation results obtained using Matlab/Simulink. In this paper the performance of the grid model is compared when it is connected from renewable energy sources through traditional and Z-Source inverter.Keywords
Distributed Generation (DG), Grid Impedance, Nqyuist Stability Criterion, Voltage Source Inverter (VSI).
- Online Sewing Defect Monitoring for SNLS Machine by Image Processing Technique
Abstract Views :444 |
PDF Views:0
Authors
Affiliations
1 Department. of Textile Technology, Department. of Electrical and Electronics Engineering, Kumaraguru College of Technology, Coimbatore-641049, IN
1 Department. of Textile Technology, Department. of Electrical and Electronics Engineering, Kumaraguru College of Technology, Coimbatore-641049, IN
Source
Research Journal of Engineering and Technology, Vol 8, No 4 (2017), Pagination: 373-377Abstract
Apparels are subjected to visual examination to detect sewing defects after making of the garments which results in higher rejection, time, cost etc. Sewing defects must be detected early i.e during sewing itself and accurately to overcome above quality issues. Apparels are mostly sewn with lock stitch in straight and curve directions, with different colours and stitches per inch. The paper discuss the on line detection of sewing defects occurring during the sewing process. Common defects such as skipped stitch, missed stitch, or loose stitch occurring in lockstitch are detected and marked. Using image processing methods, the proposed work follows the stitch path by capturing digital images of stich lines in lock stitch sewing machine and processed through PYTHON software to detect the sewing defects and subsequently stop the machine during sewing.Keywords
Sewing, Defect, Online, Image Processing, SNLS.References
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