A New Method of Three-Phase Unbalanced Load Harmonic Current Detection

Abstract:

The extensive usage of power electronic equipments makes harmonic problem increasingly serious. In unbalanced three-phase system, traditional p-q, d-q method ignores the zero sequence currents, resulting in zero sequence harmonic leakage error. This article is based on the basic principle of instantaneous reactive power theory, it proposes a new type of harmonic detection algorithm, this algorithm does not need phase-locked loop nor do a matrix transformation, and can effectively avoid the zero order harmonic leakage error caused by coordinate transformation.In the end, using Matlab/Simulink environment to build models of traditional algorithm and improved algorithm .Through comparison, the simulation result shows that the improved algorithm is more accurate and more effective than the traditional one.

• Periodical: Advanced Materials Research (Volumes 1070-1072)
• Pages: 726-730
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1070-1072.726
• Online since: December 2014
• Authors: Hong Zheng*, Yun Zhang, Jun Huang, Zhe Yu Wang
• Keywords: Active Power Filter, Harmonic Detection, Instantaneous Reactive Power Theory, Zero Order Harmonic Leakage Error

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