access icon free Second harmonic impedance drift-based islanding detection method

© The Institution of Engineering and Technology
Received 03/11/2018, Accepted 09/10/2019, Revised 02/08/2019, Published 15/10/2019

Islanding detection is an important operational aspect of microgrids. Early detection of islanding is essential to avoid unsynchronised reclosing. The possibility for minimal or near zero power mismatch between generation and load of a microgrid is high in a modern reconfigurable distribution network. Hence, at the instant of islanding, the voltage at the Point of Interconnection (PoI) will not change significantly and may lead to failure of over/under voltage and frequency relays in detecting islanding. In this work, second harmonic voltage at PoI of a voltage source inverter-based distributed generation (DG) is extracted through a sliding window discrete Fourier transform and is used for generating a second harmonic current reference, through virtual admittance. The second harmonic impedance at DG terminal is estimated. This second harmonic impedance remains insignificant in the case of grid-connected mode but drifts beyond a threshold in islanding mode. The proposed method is validated on two test cases, and the comparative results from simulation studies indicate that the islanding detection is achieved in less time with minimal effect on the power quality, fundamental voltage, and frequency at the PoI.

Inspec keywords: discrete Fourier transforms; power distribution faults; distributed power generation; power grids; voltage-source convertors; invertors

Other keywords: PoI; harmonic current reference; detecting islanding; near zero power mismatch; modern reconfigurable distribution network; harmonic voltage; unsynchronised reclosing; point of interconnection; voltage source inverter-based distributed generation; harmonic impedance drift-based islanding detection method; sliding window discrete Fourier transform; fundamental voltage; minimal power mismatch; islanding mode; microgrid

Subjects: DC-AC power convertors (invertors); Integral transforms; Power supply quality and harmonics; Distributed power generation

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