Demodulation of Three-Phase AC Power Transients in the Presence of Harmonic Distortion

Benjamin T. Gwynn and Raymond de Callafon
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Benjamin T. Gwynn: Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla, CA 92092, USA
Raymond de Callafon: Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla, CA 92092, USA

Energies, 2020, vol. 13, issue 9, 1-18

Abstract: Load switches in power systems may cause oscillations in active and reactive power flow. Such oscillations can be damped by synthetic inertia provided by smart inverters providing power from DC sources such as photovoltaic or battery storage. However, AC current provided by inverters is inherently non-sinusoidal, making measurements of active and reactive power subject to harmonic distortion. As a result, transient effects due to load switching can be obscured by harmonic distortion. An RLC circuit serves as a reference load. The oscillation caused by switching in the load presents as a dual-sideband suppressed-carrier signal. The carrier frequency is available via voltage data but the phase is not. Given a group of candidate signals formed from phase voltages, an algorithm based on Costas Loop that can quickly quantify the phase difference between each candidate and carrier (thus identifying the best signal for demodulation) is presented. Algorithm functionality is demonstrated in the presence of inverter-induced distortion.

Keywords: demodulation; harmonic distortion; costas loops; pulse width modulated inverters; power system control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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