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

Menghua Liu, Wei Zhao, Qing Wang, Songling Huang and Kunpeng Shi
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Menghua Liu: Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
Wei Zhao: Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
Qing Wang: Department of Engineering, Durham University, Durham DH1 3LE, UK
Songling Huang: Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
Kunpeng Shi: Department of Electrical Engineering, Tsinghua University, Beijing 100084, China

Energies, 2019, vol. 12, issue 8, 1-20

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 (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: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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