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Online grid-impedance measurement using ternary-sequence injection

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Online grid-impedance measurement using ternary-sequence injection. / Roinila, Tomi; Messo, Tuomas.

In: IEEE Transactions on Industry Applications, Vol. 54, No. 5, 01.04.2018, p. 5097-5103.

Research output: Contribution to journalArticleScientificpeer-review

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Roinila, T & Messo, T 2018, 'Online grid-impedance measurement using ternary-sequence injection' IEEE Transactions on Industry Applications, vol. 54, no. 5, pp. 5097-5103. https://doi.org/10.1109/TIA.2018.2825938

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Roinila, Tomi ; Messo, Tuomas. / Online grid-impedance measurement using ternary-sequence injection. In: IEEE Transactions on Industry Applications. 2018 ; Vol. 54, No. 5. pp. 5097-5103.

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@article{c7eb1f4126154a86b094bd12be1f2c9c,
title = "Online grid-impedance measurement using ternary-sequence injection",
abstract = "Grid impedance affects the stability and control performance of grid-connected power-electronics devices, such as inverters used to integrate wind and solar energy. Adaptive control of such inverters, to guarantee stability under different grid conditions, requires online measurement of the grid impedance performed in real time. Wideband frequency response-measurement techniques based on pseudo-random binary sequence (PRBS) or impulse injection have been often applied for grid-impedance measurements. However, while using the PRBS or impulse it is assumed that the system under study is linear. Because such an assumption does not typically hold for grid-connected systems, the measured impedances are usually prone to distortions caused by nonlinearities. This paper proposes the use of periodic ternary sequences for online grid impedance measurements. Using appropriately designed periodic ternary signals, the linear component of the grid impedance can be identified, eliminating errors from even-order nonlinear distortions. Inaddition, the ternary sequences can bedesigned for a much wider range of sequence length compared to conventional PRBS, enabling more efficient optimization of computing power and frequency resolution. Experimental measurements are shown from a grid-connected photovoltaic inverter.",
author = "Tomi Roinila and Tuomas Messo",
year = "2018",
month = "4",
day = "1",
doi = "10.1109/TIA.2018.2825938",
language = "English",
volume = "54",
pages = "5097--5103",
journal = "IEEE Transactions on Industry Applications",
issn = "0093-9994",
publisher = "Institute of Electrical and Electronics Engineers",
number = "5",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Online grid-impedance measurement using ternary-sequence injection

AU - Roinila, Tomi

AU - Messo, Tuomas

PY - 2018/4/1

Y1 - 2018/4/1

N2 - Grid impedance affects the stability and control performance of grid-connected power-electronics devices, such as inverters used to integrate wind and solar energy. Adaptive control of such inverters, to guarantee stability under different grid conditions, requires online measurement of the grid impedance performed in real time. Wideband frequency response-measurement techniques based on pseudo-random binary sequence (PRBS) or impulse injection have been often applied for grid-impedance measurements. However, while using the PRBS or impulse it is assumed that the system under study is linear. Because such an assumption does not typically hold for grid-connected systems, the measured impedances are usually prone to distortions caused by nonlinearities. This paper proposes the use of periodic ternary sequences for online grid impedance measurements. Using appropriately designed periodic ternary signals, the linear component of the grid impedance can be identified, eliminating errors from even-order nonlinear distortions. Inaddition, the ternary sequences can bedesigned for a much wider range of sequence length compared to conventional PRBS, enabling more efficient optimization of computing power and frequency resolution. Experimental measurements are shown from a grid-connected photovoltaic inverter.

AB - Grid impedance affects the stability and control performance of grid-connected power-electronics devices, such as inverters used to integrate wind and solar energy. Adaptive control of such inverters, to guarantee stability under different grid conditions, requires online measurement of the grid impedance performed in real time. Wideband frequency response-measurement techniques based on pseudo-random binary sequence (PRBS) or impulse injection have been often applied for grid-impedance measurements. However, while using the PRBS or impulse it is assumed that the system under study is linear. Because such an assumption does not typically hold for grid-connected systems, the measured impedances are usually prone to distortions caused by nonlinearities. This paper proposes the use of periodic ternary sequences for online grid impedance measurements. Using appropriately designed periodic ternary signals, the linear component of the grid impedance can be identified, eliminating errors from even-order nonlinear distortions. Inaddition, the ternary sequences can bedesigned for a much wider range of sequence length compared to conventional PRBS, enabling more efficient optimization of computing power and frequency resolution. Experimental measurements are shown from a grid-connected photovoltaic inverter.

U2 - 10.1109/TIA.2018.2825938

DO - 10.1109/TIA.2018.2825938

M3 - Article

VL - 54

SP - 5097

EP - 5103

JO - IEEE Transactions on Industry Applications

JF - IEEE Transactions on Industry Applications

SN - 0093-9994

IS - 5

ER -