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Smart Control of on Load Tap Changer deployed in Low Voltage Distribution Network

Electric utilities conventionally maintain distribution voltage within acceptable limit using transformer tap changer located at Medium Voltage (MV) side. Traditionally, tap changers receive control signals from single bus and change the tap positions to maintain voltages accordingly. Penetration level, location and intermittent behaviour of the Distributed Generations (DGs) integrated with the distribution system will change this trend. In future smart grids, On Load Tap Changer (OLTC) will be required to pick up the control signals from different voltage buses and change the tap positions of the transformers. In this paper, UK Low Voltage (LV) network with DGs is modelled on Matlab/Simulink and OLTC is installed at both MV and LV transformers. Conditional controller is designed to pick up the most appropriate signals from different buses to change the tap positions of both MV and LV transformers collaboratively.