An Optimal Islanding Detection Scheme for an Inverter-based Distribution Generation System
DOI:
https://doi.org/10.13052/dgaej2156-3306.3625Keywords:
DGS, islanding detection, modified H8-based controller, opti- mal solution, Reactive power control, LMI.Abstract
In this paper, an optimal controller-based islanding detection scheme is pro-
posed for an inverter-based distributed generation system (DGS). Islanding is
both harmful and unsafe but unavoidable state in a DGS. Therefore, islanding
state is required to be detected quickly and accurately. A reactive power
control strategy for islanding is presented in this work. It is reported that
the active and reactive power mismatches in a DGS forces its voltage or
frequency to deviate. That deviation is recorded continuously in this scheme
and islanding state is reported when the deviation touches the thresholds.
To help in this tracking process, a modified H8-based optimal controller
whose parameters are tuned with LMI is proposed. It can offer both feedback
and feed-forward control actions. The proposed DGS is modelled using
MATLAB/SIMULINK and tested taking several case studies. It is found that,
islanding condition is rapidly detected compared to that of the uncontrolled
scheme yielding an optimal solution. Further, it is an inexpensive, robust,
compact in structure and very easy to implement too.
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