Dynamic Control and Time-Delayed Channel Scheduling Co-Design for Voltage Control in Active Distribution Networks

For the purpose of dealing with the weaker tolerance of the distribution system to voltage fluctuations after the massive distributed generation (DG) access, this paper proposes a dynamic voltage and communication channel scheduling co-design scheme for active distribution networks (ADNs). The scheme exploits the centralized robust controller, the channel scheduler, and the synchrophasor from the distribution network PMU to achieve fast coordination of DG and recovery of voltage under the condition of restricted communication channel resources. In this paper, a unified mathematical model based on an uncertain discrete time-delay switched system is developed, considering both channel scheduling and voltage control. A design of a robust cost-guaranteed voltage controller considering dynamic channel scheduling is proposed to ensure stability. Further, an optimal dynamic channel scheduling strategy is proposed to provide performance optimization via the channel scheduler for the control system. The simulation validates the effectiveness of the proposed co-design scheme in terms of stability and improvement of performance under limited communication resources.