A Frequency/Phase/Amplitude Estimator for Three-Phase Applications Operating at a Low Sampling Rate

Abdullah M. Abusorrah and Hamed Sepahvand ()
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Abdullah M. Abusorrah: Renewable Energy and Power Systems Research Group, King Abdulaziz University, Jeddah 21589, Saudi Arabia
Hamed Sepahvand: Renewable Energy and Power Systems Research Group, King Abdulaziz University, Jeddah 21589, Saudi Arabia

Mathematics, 2024, vol. 12, issue 3, 1-18

Abstract: A frequency/phase/amplitude estimator is arguably one of the most crucial components in the control and synchronization of grid-connected equipment. Such an estimator may also be useful for monitoring and protection purposes in power systems. In this paper, an open-loop (and therefore unconditionally stable) estimator for the accurate and rapid extraction of the grid voltage phase, frequency, and amplitude is presented. In designing the proposed technique, special focus is given to applications operating at a low sampling rate. Examples of such applications include high-power converters, where both switching and sampling frequencies are very low. The study concludes with a comprehensive evaluation of the proposed estimator, demonstrating its effectiveness in accurately and swiftly estimating the fundamental parameters of grid voltage under low sampling rates. It highlights the estimator’s enhanced performance in scenarios of distorted grid conditions and its superiority in filtering capabilities compared to traditional methods. These findings underline the estimator’s potential for broad applicability in power system monitoring, protection, and control.

Keywords: amplitude estimation; backward difference formula (BDF); digital signal processing; frequency estimation; fundamental frequency; phase detection; power systems; sampling frequency (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2024
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