Closed-Loop Pressure Control Based on Smith Predictor for Gas Distribution Network

The closed loop control problem of gas distribution network is investigated in this paper. This system involves two control loops where the secondary part of the process (the inner loop) has a negligible delay while the primary loop (the outer loop) has a significant and time variant delay. The use of Smith Predictor in the outer loop of cascade control system compensates the negative effect of time delay in the performance of the controller. Due to sensitivity of Smith Predictor to modeling error, this paper focuses on an accurate identification method to eliminate this problem. Simulation results for Khouzestan gas distribution network as a case study are included in this paper to illustrate the proposed technique.