access icon openaccess Novel islanding detection method for inverter-based distributed generators based on adaptive reactive power control

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 20/06/2018, Accepted 01/08/2018, Published 22/01/2019

Here, a novel active islanding detection method for inverter-based distributed generators (IBDGs) is presented. In order to reduce the disturbance in grid-connected mode and realise rapid and effective detection during islanding, the linear reactive power disturbance is utilised in the proposed method and its slope can change adaptively. The voltage variation and correlation factor between reactive power disturbance and frequency variation are proposed as criteria for disturbance slope adjustment. In addition, considering IBDGs located at different positions can detect the same frequency variation characteristics, the value of the frequency is used as the criteria to control the disturbance values, which can guarantee the synchronisation of disturbances added on different IBDGs without the need of communication. According to the anti-islanding test system recommended in IEEE Std.929-2000, the effectiveness of the method has been validated with several case studies in the power systems computer-aided design (PSCAD)/EMTDC environment.

Inspec keywords: power generation control; power system simulation; frequency control; power generation faults; invertors; reactive power control; power distribution faults; IEEE standards; fault diagnosis; distributed power generation; power distribution control; electric generators; power grids; adaptive control

Other keywords: IBDG; adaptive reactive power control; voltage variation; frequency variation characteristics; active islanding detection method; disturbance slope adjustment; EMTDC environment; grid-connected mode; inverter-based distributed generators; linear reactive power disturbance; anti-islanding test system; power systems computer-aided design; correlation factor

Subjects: Distribution networks; Control of electric power systems; Distributed power generation; Power and energy control; Frequency control; Power system control; Power convertors and power supplies to apparatus; DC-AC power convertors (invertors)

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