An Irregular Current Injection Islanding Detection Method Based on an Improved Impedance Measurement Scheme

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, 2018, vol. 11, issue 9, 1-18

Abstract: One class of islanding detection methods, known as impedance measurement-based methods and voltage change monitoring-based methods, are implemented through injecting irregular currents into the network, for which reason they are defined in this paper as irregular current injection methods. This paper indicates that such methods may be affected by distributed generation (DG) unit cut-in events. Although the network impedance change can still be used as a judgment basis for islanding detection, the general impedance measurement scheme cannot separate island events from DG unit cut-in events in multi-DG operation. In view of this, this paper proposes a new islanding detection method based on an improved impedance measurement scheme, i.e., dynamic impedance measurement, which will not be affected by DG unit cut-in events and can further assist some other equipment in islanding detection. The simulations and experiments verify the stated advantages of the new islanding detection method.

Keywords: assisting islanding detection; distributed generation (DG) unit cut-in; impedance measurement; islanding detection; multi-DG (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: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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