Islanding detection in a hybrid power system using continuous wavelet transform

Now a days, Distributed Generation is taking an important part in power systems. In the present scenario distributed generation has given lot of importance in energy systems. With the contribution of the distribution of energy to power generation, the impact on the power system becomes more apart. Now the island has become a major problem in the use of distributed generators (DGs)in the power systems. The increase in the Distributed Generator(DG) in the power system causing major issue of islanding. This condition is referred to as an isolated condition when a portion of the distributed system is electrically separated from the rest of the systems and the DG in the isolated portion continues to power the local load. When DG(s) continues to supply power to a separated power network and another part of it becomes electrically isolated from the power network, this frequent phenomenon is called as Islanding condition. In this paper, in order to detect the islanding effect in distributed generation, we use the wavelet transform components of current and voltage. In this work, we used continuous wavelet transforms which are caused by negative sequence components of voltage and current for the indication of islanding in distributed generation. When the detailed coefficients at level 1(d1) clearly isolate the event, further detection of the island condition.