Direct Phase-Angle Detection for Three-Phase Inverters in Asymmetrical Power Grids

Sadeque, Fahmid; Benzaquen, Joseph; Adib, Aswad; Mirafzal, Behrooz

doi:10.1109/jestpe.2020.2977398

Title: Direct Phase-Angle Detection for Three-Phase Inverters in Asymmetrical Power Grids

Journal Article · Mon Mar 02 00:00:00 EST 2020 · IEEE Journal of Emerging and Selected Topics in Power Electronics

DOI:https://doi.org/10.1109/jestpe.2020.2977398· OSTI ID:1905740

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Kansas State Univ., Manhattan, KS (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

This paper introduces a signal reformation based direct phase-angle detection (DPD-SR) technique for three-phase inverters supporting asymmetrical grids. Asymmetries in three-phase systems may happen because of unbalanced three-phase loads, which can lead to the voltage asymmetry at the terminals of grid-tied inverters. The proposed DPD-SR technique can detect the voltage phase-angle under asymmetrical conditions. The DPD-SR technique also offers precise and rapid phase-angle detection via signal reformation and trigonometric functions. In essence, the phase-angle detection is directly derived from the trigonometric properties of the line-line voltages, while signal reformation is implemented to handle asymmetrical voltages. The proposed method measures two line-line voltages and detects the phase-angle of a three-phase system under both symmetrical and asymmetrical conditions. Unlike classical phase-locked loop (PLL) techniques, DPD-SR does not need any closed-loop PI controller, which significantly reduces the complexity and the delay in detecting the phase-angle. In this paper, the efficacy of the proposed technique is examined in comparison with the state-of-the-art PLLs under asymmetrical conditions via a set of laboratory experiments. Here, the performance of the phase-angle detection is also tested as part of an inverter feeding an asymmetrical grid.

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Research Organization:: Kansas State Univ., Manhattan, KS (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office

Grant/Contract Number:: EE0008767

OSTI ID:: 1905740

Journal Information:: IEEE Journal of Emerging and Selected Topics in Power Electronics, Vol. 9, Issue 1; ISSN 2168-6777

Publisher:: IEEECopyright Statement

Country of Publication:: United States

Language:: English

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On Control Schemes of Voltage Source Converters Sadeque, Fahmid; Hossen, Tareq arXiv https://doi.org/10.48550/arxiv.2112.06993	preprint	January 2021

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24 POWER TRANSMISSION AND DISTRIBUTION
Phase-angle detection
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Title: Direct Phase-Angle Detection for Three-Phase Inverters in Asymmetrical Power Grids

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