Retransmission Methods to Improve Voltage Control of Distributed Generation System

In smart grid, voltage control feeds back state information from sensors to controllers via wired or wireless channels to stabilize the electricity distribution. When wireless channel is applied, because of the interference among wireless sensors, scheduling is necessary for efficient and reliable data aggregations. Previous work proved that delay-tolerant Kalman filter (DTKF)-based dynamic state-aware scheduling can improve voltage stability of distributed generation system. However, in practice, the transmission of sensor data over fading channels suffers losses, and lost packets would miss the opportunity of providing state information for voltage controllers. In this work, we use retransmission to combat losses, and study the impact of retransmission on voltage control. Network-coding-based retransmission is also used to increase retransmission efficiency and reduce delays. Simulation results show that the scheduling strategies with retransmission are indeed effective in certain scenarios.