A grid inductance detection method based on the oscillation characteristic of inverter terminal voltage

Duan, Shuangming, Xia, Bo, Yan, Gangui, Li, Nan ORCID: https://orcid.org/0000-0002-0649-9493, Li, Gen ORCID: https://orcid.org/0000-0002-0649-9493 and Ding, Yi 2022. A grid inductance detection method based on the oscillation characteristic of inverter terminal voltage. IEEE Transactions on Power Electronics 37 (6) , pp. 7209-7217. 10.1109/TPEL.2021.3139886

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Abstract

In grid-connected photovoltaic (PV) systems, grid inductance greatly influences the performance of grid-connected inverters. However, the grid inductance usually varies with the changes of the grid operation conditions. Therefore, accurate grid inductance detection is one of the key technologies to achieve an adaptive control of the grid-connected inverters under different operation conditions. In this paper, an equivalent circuit model of a grid-connected PV system which includes the controller, filter, and grid impedance is established. The oscillation characteristic of the inverter terminal voltage caused by the step change of the inverter output power is analyzed. The oscillation mechanism of the inverter terminal voltage caused by the interaction of the controller, filter, and grid impedance is investigated. A grid inductance detection method based on the oscillation characteristic of the inverter terminal voltage is proposed. The main advantage of the proposed method is that it does not need complicated signal processing and calculation procedures. A 10 kW grid-connected PV system was built for both simulations and the experimental setup. Finally, simulation and experimental results validate the correctness and effectiveness of the proposed method.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Publisher:	Institute of Electrical and Electronics Engineers
ISSN:	0885-8993
Date of First Compliant Deposit:	6 January 2022
Date of Acceptance:	23 December 2021
Last Modified:	06 Nov 2023 16:28
URI:	https://orca.cardiff.ac.uk/id/eprint/146422

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