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- 저자 : Harinadha Reddy K. (검색결과 2 건)
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Hybrid ROCOF Relay for Islanding Detection
Rami Reddy Ch.,Harinadha Reddy K.,Aymen Flah,Srikanth Goud B.,Bajaj M.,Abdulaal M. J.,Milyani A. H. 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.1
Distributed generation (DG) is increasing in day to day life to meet the global energy consumption demand. One of the major problems with such DG is islanding. The islanding is caused in the grid connected system when a part of DG is disconnected from the main grid and continues to feed the load connected. As per the IEEE 1547 DG interconnection standards, the islanding should be detected within 2 s after islanding. This paper presents, a new rate of change of frequency (ROCOF) based hybrid islanding detection approach. It combines the passive and active ROCOF methods. The simulation results indicate this method is very effi ciently classifying the islanding and non islanding events. It detects the zero power balanced islanding within 200 ms and unbalanced islanding within 100 ms. The simulation results are carried on Matlab/Simulink 2018B environment.
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Ch. Rami Reddy,K. Harinadha Reddy 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.2
Grid integration of renewable energy sources in distributed generation (DG) is increasing day to day life due to their advantages of increasing system reliability and power quality. Ahead of their advantages, they are suff ering with the problem of unintentional islanding. Islanding is caused in the DG due to problems in the main grid. It is required to detect the islanding within 2 s after islanding as per DG interconnection standards. In this paper a new passive islanding detection method for single synchronous generator based DG and multiple DG units is proposed with rate of change of exciter voltage, over the rate of change of reactive power (dE/dQ). Due to inertia, the response of these exciter voltage and reactive power are very sensitive to small changes compared to other passive parameters, because in the real world the exciter voltage and reactive power are directly depends on the excitation of the generator. The investigations are made on the Matlab/Simulink environment. This method is clearly diff erentiating between islanding and non islanding events. The eff ectiveness of this method compared with other passive methods is, it detects islanding during zero power imbalance conditions of active and reactive power.
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