Feasibility study of an intentional islanding operation with a new adaptive load shedding

Abstract

Intentional islanding operation has recently been considered by some utilities to effectively use the available renewable energy generation. In this paper, an intentional islanding operation of hydro Distributed Generation (DG) is proposed. Governor and Automatic Voltage Regulation (AVR) are properly developed such that the DG exhibits a good dynamic response once a part of the network is islanded. A new adaptive load shedding scheme is also proposed to address the issue of overload or insufficient generation after the system is islanded. The scheme is based on a combination of adaptive and intelligent techniques. The disturbance magnitude of response based and event based is treated differently: 1) event based is based on the power imbalance 2) response based is based on the swing equation which relies on the frequency and Rate of Change of Frequency measurement. To investigate the effectiveness of the controller and the load shedding scheme, dynamic simulation on an intentional islanding operation is performed on an existing Malaysia network interconnected with mini hydro generation. The simulation results demonstrate that the island is successfully established with the frequency and voltage response during the islanding operation are within the acceptable limit.