Distributed Energy Resources Based Two-Layer Delay-Independent Voltage Coordinated Control in Active Distribution Network
Sergey Gorbachev, Ashish Mani, Li Li, Long Li, Yudi Zhang
Abstract
In order to solve serious voltage problem in active distribution networks and improve the utilization rate of renewable energy resources, a distributed energy resources (DERs) based two-layer delay-independent voltage coordinated control method is proposed. First, an upper-layer sensitivity-based voltage coordinated control strategy is designed by maximizing the use of residual reactive power and minimizing active power reduction, where reactive power compensation and active power regulation from the most sensitive DERs are performed in a high priority. Then, a lower-layer delay-independent coordinated controller is designed to dynamically regulate the reactive/active power of each DER unit, when communication transmission delays are within the estimated allowable range. A robust controller is designed with the local states of DER and the states of other coupling DERs with time delay, thereby overcoming the effects of coupling characteristics among DERs and parameter uncertainties. Finally, simulation results demonstrate the effectiveness of the proposed method.