Published Paper Details:

It is expected that increasing amounts of new generation technologies will be con- nected to electrical power systems in the near future. Most of these technologies are connected to distribution grids.When connected in small amounts, the impact of dis- tributed generation on power system transient stability will be negligible. However, if its penetration level becomes higher, distributed generation may start to influence the dynamic behavior of the power system as a whole.The effects of distributed genera- tion are increased short circuit levels,changes in load losses ,changes in voltage profiles along the network, voltage transients will appear, power quality and reliability may be affected and the networks protections may not function properly.The transients introduced will tend to change the input side voltage of a transformer.But in order to maintain a constant output, it is necessary to implement effective control meth- ods.Conventionally, this is done by On-Load Tap Changing mechanism.It is a method in which the turns ratio is varied in accordance with the input voltage variations and thus maintains a constant output.But the conventional system uses manually controlled mechanical tap changers.This has certain disadvantages like arcing, wear and tear of contacts and thus requiring frequent maintenance.The proposed system uses a TRIAC based OLTC technology.It maintains the output of the transformer constant even when there is variation in input due to voltage fluctuations, sag etc.Its response time is much better than the conventional system and the problem of arcing, wear and tear etc., are reduced.