Voltage Support of Transmission Networks: Distributed Reactive Power Coordination

This lecture discusses the coordination of distributed reactive power sources for voltage support in transmission networks. It covers the motivation behind the need for coordination between transmission and distribution networks, the concept of passive and active voltage support modes, a model-free control scheme, coordination strategies, and the participation of LTCs in MV/LV transformers. The lecture also explores the control of PV systems under external requests, local support to PVs in overvoltage conditions, and the restoration process to normal operation. Simulation results and conclusions on the role of DER in complementing existing reactive power sources are presented.