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Energies 2019, 12(8), 1467; https://doi.org/10.3390/en12081467

Compatibility Issues with Irregular Current Injection Islanding Detection Methods and a Solution

1
Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
2
Department of Engineering, Durham University, Durham DH1 3LE, UK
*
Author to whom correspondence should be addressed.
Received: 3 February 2019 / Revised: 27 March 2019 / Accepted: 10 April 2019 / Published: 17 April 2019
(This article belongs to the Section Electrical Power and Energy System)
PDF [1229 KB, uploaded 17 April 2019]

Abstract

Islanding detection methods, based on injecting high-/low-frequency currents or negative sequence fundamental frequency currents and observing the resultant responses, are collectively referred to as irregular current injection methods in this paper. In multi-distributed generation (DG) operation, if there is no restriction to the phase of injected irregular currents, the currents at the same frequency may cancel each other out, and then their convergent current may be too small to cause a detectable response, for which reason islanding detection will be severely affected. Accordingly, this paper raises a compatibility issue, which requires the phase difference between any two injected irregular currents to be within a certain interval. In response to this issue, a solution is proposed. According to this solution, the terminal voltage of DG units is referenced to conduct irregular currents injection, and only certain high-frequency currents are used as injected currents. If this solution is adopted by as many manufacturers as possible, the effect and reliability of such methods will be greatly improved.
Keywords: compatibility; current injection; islanding detection; multi-DG; terminal voltage reference compatibility; current injection; islanding detection; multi-DG; terminal voltage reference
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Liu, M.; Zhao, W.; Wang, Q.; Huang, S.; Shi, K. Compatibility Issues with Irregular Current Injection Islanding Detection Methods and a Solution. Energies 2019, 12, 1467.

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