An Islanding Detection Method Based on Q-Axis Disturbance Signal Injection

Abstract:

This paper puts forward a novel islanding detection method based on q-axis disturbance signal injection. This method, by introducing q-axis disturbance signal injection, makes the RLC load generate frequency offset to detect the island in the case that the power network is disconnected due to certain fault.The introduced q-axis disturbance signal injection method is connected with reactive power variation and frequency variation whose values are close to zero when photovoltaic system is operated in grid-connected mode. Therefore, the suggested method has the advantage of tiny harmonic distortion and good power quality. The simulation results based on the MATLAB/Simulink software show that the novel islanding detection method can detect the island in 1 second and has little effects on the system under the condition of the set parameters.

• Periodical: Advanced Materials Research (Volumes 732-733)
• Pages: 646-652
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.732-733.646
• Online since: August 2013
• Authors: Jian Liu, Hou Hui Fang, Xian Feng Li
• Keywords: Current Disturbance, Frequency Deviation, Islanding Detection, Reactive Power Variation

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