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Harmonic Load Identification Using Independent Component Analysis



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Section 6 Chapter 5 Chapter 19 Harmonic Load Identification Using Independent Component Analysis Ekrem Gursoy Dagmar Niebur 5 1 Introduction Due to an increase of power electronic equipment and other harmonic sources the identification and estimation of harmonic loads is of concern in electric power transmission and distribution systems Conventional harmonic state estimation requires a redundant number of expensive harmonic measurements In this chapter we explore the use of a statistical signal processing technique known as Independent Component Analysis for harmonic source identification and estimation If the harmonic currents are statistically independent ICA is able to estimate the currents using a limited number of harmonic voltage measurements and without any knowledge of the system admittances or topology Results are presented for the modified IEEE 30 bus system Identification and measurement of harmonic sources has become an important issue in electric power systems since increased use of power electronic devices and equipments sensitive to harmonics has increased the number of adverse harmonic related events Harmonic distortion causes financial expenses for customers and electric power companies Companies are required to take necessary action to keep the harmonic distortion at levels defined by standards i e IEEE Standard 519 1992 Marginal pricing of harmonic injections is addressed in to determine the costs of mitigating harmonic distortion Harmonic levels in the power system need to be known to solve these issues However in a deregulated network it may be difficult to obtain sufficient measurements at substations owned by other companies Harmonic measurements are more sophisticated and costly than ordinary measurements because they require synchronization for phase measurements which is achieved by Global Positioning Systems GPS It is not easy and economical to obtain a large number of harmonic measurements because of instrumentation installation



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