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Phasor Measurement Improvement Using Digital Filter in a Smart Grid

Phasor Measurement Improvement Using Digital Filter in a Smart Grid
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Author(s): Abderrahmane Ouadi (Institute of Electrical and Electronic Engineering, University M'hamed Bougara of Boumerdes, Algeria)and Abdelkader Zitouni (University M'hamed Bougara of Boumerdes, Algeria)
Copyright: 2021
Pages: 18
Source title: Optimizing and Measuring Smart Grid Operation and Control
Source Author(s)/Editor(s): Abdelmadjid Recioui (Université M'hamed Bougara de Boumerdes, Algeria)and Hamid Bentarzi (Université M'hamed Bougara de Boumerdes, Algeria)
DOI: 10.4018/978-1-7998-4027-5.ch005

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Abstract

During a transient operation condition of power smart grid, line current may include unwanted components that may cause unnecessary tripping of protection system. The disturbance mainly appears in a form of harmonics and sub-harmonics. In this case of signal waveforms including harmonics, the low pass filter may be used. However, this type of filter does not provide the ability to reject sub-harmonics. This chapter presents the digital filtering design issue based on optimization approach for removing sub-harmonics and hence improving the measurement. The first point of view is to reach an unified accurate phasor measurement algorithm that is immune to nearly all disturbances (sub-harmonics) in power grid including FACT devices and renewable energy sources, simultaneously with required speed of convergence. The second point focuses on reducing the computational requirement and algorithm complexity through designing recursive digital filter with reduced order.

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