Critical impedance based automatic identification of harmonic sources in deregulated power industry

In this paper automatic identification of origin of harmonic source in deregulated power sector has been carried out. It is a well known fact that Critical impedance method for detection of harmonic disturbances caused between utility and source side has already been reported in literature. Taking the critical impedance method as the base harmonic sources are identified in deregulated power sector. However, it is found out that the observation of critical impedance plots are confused and inefficient. Hence, a decision tree method is used to automatically identify the harmonic source. Due to unavailability of practical data simulation approach has been adopted. A five bus system model with two Generation companies (GENCOS) has been simulated for power transfer from GENCO to the considered five bus system. Harmonic current is injected in the system by using a three phase diode rectifier. The results obtained are very efficient in identifying the bus number at which harmonic source is present.