Load shedding in a distribution network

Conventional methods of load shedding are too slow, do not effectively calculate the correct amount of load to shed and lack in operating in a coordinated way. This results in either unnecessary or insufficient load reduction. A new technique should be applied that will be fast and optimal relying on slow communication in order for the distribution network to maintain stability and to improve the reliability of supply to customers. This paper assesses the behavior of a 33 kV distribution network consisting of different type and size of loads and distributed generators, with the load shedding technique. The magnitude of the disturbance is determined using the swing equation, obtaining this way a more efficient system operation during emergency conditions with less customer interruption. Explanation of the load shedding architecture implemented and the investigation of its behavior are demonstrated through dynamic simulation using the power system analysis package PSCAD.