Joint scheduling analysis of time-delay impact on networked control system for multi-inverter parallel operation

A networked control method for multi-inverter parallel system is proposed in this paper. Current-sharing control strategy and communication design are described. TOD (Try-Once-Discarded) scheduling mode is used to realize the real-time and accurate transmission, and the Joint scheduling algorithm of TOD is implemented to predict the networked control system performance with network time-delay. The time-delay bound to keep system stable is quantified and buffer area is used to adjust the time-delay value. Mathematical model is built with theory of both wireless multi-inverter parallel and TOD. The maximum induced time-delay represented by MALI (Maximum Allowable Transfer Interval) is estimated. The experimental results demonstrate the validity of using joint scheduling analysis method for inverter parallel operation system.