Performance assessment of active frequency drifting islanding detection methods

Islanding detection is a mandatory feature for grid-connected inverters. The effectiveness of passive islanding detection methods (IDMs) is usually demonstrated by means of nondetection zones (NDZs) represented in a power mismatch space (/spl Delta/P versus /spl Delta/Q). Active frequency drifting I...

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Bibliographic Details
Published in:IEEE transactions on energy conversion 2006-03, Vol.21 (1), p.171-180
Main Authors: Lopes, L.A.C., Huili Sun
Format: Article
Language:English
Subjects:
Dispersed storage and generation
Drift
Electric power distribution
Electric power systems
Equivalence
Frequency
Frequency shift
Inverters
islanding
Load
Mathematical analysis
photovoltaic power systems
Photovoltaic systems
Power generation
Power system protection
protection
Q factor
Quality factor
RLC circuits
safety
Simulation
Studies
Substation protection
Sun
Voltage
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Summary:Islanding detection is a mandatory feature for grid-connected inverters. The effectiveness of passive islanding detection methods (IDMs) is usually demonstrated by means of nondetection zones (NDZs) represented in a power mismatch space (/spl Delta/P versus /spl Delta/Q). Active frequency drifting IDMs have been shown to provide improved performance but their theoretical NDZ cannot be described in the /spl Delta/P versus /spl Delta/Q space for a general RLC load. This paper shows that a load parameter space based on the values of the quality factor and resonant frequency of the local load (Q/sub f/ versus f/sub 0/) can be used in these cases. It employs a single curve to represent the NDZ of frequency drifting IDMs for any RLC loads. Equations that represent NDZs of three common active IDMs in the Q/sub f/ versus f/sub 0/ load parameter space are derived and it is shown that the slip mode frequency shift and the Sandia frequency shift IDMs can be designed to guarantee islanding detection for equivalent RLC loads with a quality factor smaller than a design value. The accuracy of the NDZs is verified with simulation and experimental results.
ISSN:0885-8969
1558-0059
DOI:10.1109/TEC.2005.859981