Pilot Protection Scheme for Photovoltaic Based Distribution Network by Using High Frequency Superimposed Network Approach

As fault current of distributed PVs depends on inverter control scheme and type of fault. This anomaly arises malfunctioning of current protection and differential protection scheme in distributed PVs. To overcome this anomaly high frequency superimposed network approach is used at very high frequency such that the pilot protection scheme gets independent of inverter control. Also, by using extra high frequency impedance modelling approach, identification of internal and external fault can be done effectively. Moreover, Protection scheme provide advantages such as fast tripping, adaptable to teed feeders, less data synchronisation is need, independent of fault resistance. This protection scheme is independent of type of fault and fault location.