Abstract
The new method for islanding detection in distribution network is presented in this paper. The islanding conditions should be detected as soon as possible. Therefore, this paper presents a new method that detects the islanding condition before main circuit breaker opening. The proposed method is based on the zero sequence angle of the current measured at the utility side of the utility circuit breaker. The measured parameter has a unique characteristic in the islanding conditions. The discrete wavelet transform is applied to extract the feature from the measured angle. This feature determines the islanding condition from non-islanding ones. The accuracy and efficiency of the proposed method for islanding detection is confirmed by simulation results. This method is effective for islanding detection in distribution network with high penetration of distributed generations. The proposed method causes no power quality problems for distribution network and can be developed in smart grids.
Highlights
Due to the development of semiconductor technologies and the environmental commitments, more Distributed Energy Resources (DERs) have been used in distribution networks
This paper presents a new method for islanding detection in distribution network
The relay and the utility circuit breaker need the time for sensing and clearing the fault current. This time can be saved for islanding detection and changing the control strategy by movement the measuring point from the point of common coupling (PCC) to the utility side of the utility circuit breaker
Summary
Due to the development of semiconductor technologies and the environmental commitments, more Distributed Energy Resources (DERs) have been used in distribution networks. The MG operates in grid connected mode. The MG should disconnect when a fault occurs in the upstream network. This MG operation mode is called islanding operation mode. In grid-connected operation mode, the frequency and the voltage of the MG is maintained within a tight range by the main grid. The frequency of the MG has a strong relation with the active power of the MG in an islanded operation mode. The control strategy of the DGs in an islanding operation mode is the frequency and voltage control. NDZ is "the difference between active and reactive power on the island when islanding cannot be detected by the corresponding method" [4]. The islanding detection method can be classified into the remote methods and the local methods
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