Performance of Induction Generator Protection During Distribution Network Disturbances

Distributed generators (DGs) that are rated between several kVA and 250 kVA in size are increasingly being connected at the 400 V electrical distribution level. Therefore, new requirements for the traditional network protection schemes and the co-ordination between network protection and intertie protection are needed. Actual problems have been experienced relating to DG transient behaviour, thereby, more accurate analysis is required. This paper presents studies using a real time simulation platform to investigate the transient behaviour of the distributed generators´ protection under external disturbances. Furthermore, an optimized DG protection setting for keeping most of the DG stable under such disturbances is proposed.