Approximate Algorithm for Fast Calculating Voltage Unbalance Factor of Three-Phase Power System

The method of calculating voltage unbalance factor (VUF) recommended by the IEC61000-4-27 has the disadvantage of requiring square root operation. This paper focuses on the fast and accurate calculation of VUF of three-phase power system. The approximate algorithm for calculating the magnitude of th...

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Bibliographic Details
Published in:IEEE transactions on industrial informatics Vol. 10; no. 3; pp. 1799 - 1805
Main Authors: Wen, He, Cheng, Da, Teng, Zhaosheng, Guo, Siyu, Li, Fuhai
Format: Journal Article
Language:English
Published: Piscataway IEEE 01.08.2014
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Algebra
Algorithms
Approximation
Clocks
Digital signal processors
Electric potential
Equations
IEC
Informatics
Mathematical analysis
Mathematical model
Motors
Power systems
Roots
Simulation
Unbalance
Voltage
Approximate
voltage unbalance
unbalance factor
unbalanced vectors
three-phase power system
ISSN:1551-3203, 1941-0050
Online Access:Get full text
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Summary:The method of calculating voltage unbalance factor (VUF) recommended by the IEC61000-4-27 has the disadvantage of requiring square root operation. This paper focuses on the fast and accurate calculation of VUF of three-phase power system. The approximate algorithm for calculating the magnitude of the zero, positive, and negative sequences by simple algebraic equation is presented. In the proposed method, the square root operation is first transformed to simple trigonometric equations based on the geometric figure, and then the trigonometric equations are approximated by the algebraic operations, which thus reduced the computation burden sufficiently. The simulation and practical experiment results show that the proposed method can achieve the same level of precision as the method recommended by the IEC61000-4-27, while much less clock cycles are required, which indicates its wide application in digital signal processor (DSP).
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ISSN:1551-3203
1941-0050
DOI:10.1109/TII.2014.2327485