An Approach to Minimize the Motor Starting Voltage Dip Using Voltage Support DG Controller

Direct Online (DOL) starting inrush current of induction motor creates voltage dip throughout the distribution network. This is one of the main causes of disruption of nearby sensitive equipment. This paper analyses the characteristics of voltage dip due to the DOL starting induction motor and explores an approach for mitigating the voltage dip using voltage support distributed generation (VSDG). A control strategy to mitigate the motor start transient and to restore the network voltage quickly is proposed. Simulation studies are carried out in order to validate the theoretical framework. It is shown that VSDG can restore the motor starting transient voltage dip quicker than a voltage regulator or an on-load tap changer (OLTC).