The digital algorithm for fast detecting and identifying the asymmetry of voltages in three-phase electric grids of mechanical engineering facilities

International Conference on Mechanical Engineering, Automation and Control Systems 2016

机械制造;无线电电子学;计算机科学

Shonin, O.B.^1 ; Kryltcov, S.B.^1 ; Novozhilov, N.G.^1

Department of Electrical Engineering, Saint-Petersburg Mining University, 2, 21st Line, St Petersburg

199106, Russia^1

关键词: High order harmonics;    Iterative algorithm;    SIMULINK environment;    Symmetrical components;    Three phase voltage;    Unbalanced voltage sags;    Unbalanced voltages;    Voltage space vectors;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/177/1/012011/pdf
DOI  :  10.1088/1757-899X/177/1/012011

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

The paper considers a new technique for the fast method of extracting symmetrical components of unbalanced voltages caused by the faults in electric grids of mechanical engineering facilities. The proposed approach is based on the iterative algorithm that checks if the set of at least three voltage discrete measurements belongs to a specific ellipse trajectory of the voltage space vector. Using classification of unbalanced faults in the grid and results of decomposing the voltages into symmetrical components, the algorithm is capable to discriminate between one-phase, two-phase and three-phase voltage sags. The paper concludes that results of simulation in Simulink environment have proved the correctness of the proposed algorithm for detecting and identifying the unbalanced voltage sags in the electrical grid under condition that it is free from high order harmonics.