Contents I. Introduction
The electric power suppliers and consumers are getting more concerned about the quality of power that is provided to them, and which is consumed by the users. Power quality (PQ) is a very vast subject and has many factors that affect it. These factors cause disturbances to the electrical system either at the supplier side or on the consumer side. These factors have been associated with PQ for a long time, but they are only coming to forefront now as the financial aspect, and loses to different equipment has demanded more attention from engineers and researchers. The engineers and researchers have decided to develop specific methodologies to handle these issues and to mitigate the losses for all the stake holders. PQ has come to centre stage due to very important factors which include more sensitive loads, rise in use of microprocessor control system, and certain devices which can detect these disturbances more accurately and efficiently. The system efficiency plays important role along with a well-informed user who is familiar with the PQ issues. Technically engineers define power as “the rate at which electrical energy is provided to the circuit or consumed by a load and it is proportional to the product of current and voltage”. The definition of power does not quantify the specific parameters that can affect the quality of power. It is evident from the definition of power that the only factor which can be of any help is the voltage as it can be regulated by the power system [1]
