WorkinProgress Wireless Network Reconfiguration for Control Systems Wenchen

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Work-in-Progress: Wireless Network Reconfiguration for Control Systems Wenchen Wang, Daniel Mosse, Daniel Cole, Jason

Work-in-Progress: Wireless Network Reconfiguration for Control Systems Wenchen Wang, Daniel Mosse, Daniel Cole, Jason G Pickel Wenchen Wang wew [email protected] edu

Wireless Control System (WCS) Actuator Plant Sensors Delay and Message Loss control signal •

Wireless Control System (WCS) Actuator Plant Sensors Delay and Message Loss control signal • Performance Degradation Remote Controller measurements • Delay and message losses can induce additional error, network-induced error output Wired control system output Network-induced error Wireless control system output time Wenchen Wang wew [email protected] edu

Problem Statement • Trade-off between delivery ratio and delay – Higher delivery ratio more

Problem Statement • Trade-off between delivery ratio and delay – Higher delivery ratio more redundant nodes more delay – Optimal network configuration • Time-correlated link failures [Baccour TOSN’ 12] – Network reconfiguration • Objective: network-induced error reduction • Solution: network reconfiguration framework Wenchen Wang wew [email protected] edu

Network Reconfiguration Framework • Input – Network configuration set • Offline – Optimal network

Network Reconfiguration Framework • Input – Network configuration set • Offline – Optimal network configuration table indexed by LSR values. • Online – LSR estimation at run time – Centralized network reconfiguration algorithm Wenchen Wang wew [email protected] edu

Thanks! Wenchen Wang wew 50@pitt. edu

Thanks! Wenchen Wang wew [email protected] edu

Work-in-Progress: Cross-layer Real. Time Scheduling for Wireless Control System Wenchen Wang, Daniel Mosse, Jason

Work-in-Progress: Cross-layer Real. Time Scheduling for Wireless Control System Wenchen Wang, Daniel Mosse, Jason G Pickel, Daniel Cole Wenchen Wang wew [email protected] edu

Motivation: NPP demands • Multiple Small Modular Reactors (SMRs) in an NPP • Different

Motivation: NPP demands • Multiple Small Modular Reactors (SMRs) in an NPP • Different SMRs typically have different power demands – Power demands change dynamically, given load consumed Wenchen Wang wew [email protected] edu

Motivation: observations • Test the network-induced error on one PHX – Different reference functions

Motivation: observations • Test the network-induced error on one PHX – Different reference functions with one ramp • power change amount (PCA) • power change duration (PCD) – Different delivery ratio and delay Ramp 30 PCA: 10 MW PCD: 30 s Wenchen Wang wew [email protected] edu

Motivation: observations Power output RMSE Network-induced error 1 0. 9 0. 8 0. 7

Motivation: observations Power output RMSE Network-induced error 1 0. 9 0. 8 0. 7 0. 6 0. 5 0. 4 0. 3 0. 2 0. 1 0 delay=0. 1 s delay=0. 2 s delay=0. 3 s RMSEs are similar delay=0. 4 s delay=0. 5 s 15 30 45 60 PCD (s) 75 90 105 120 PCA: 10 MW; DR: 0. 9 • For reference functions with higher ramp ratios, the network delay becomes a more significant factor. Wenchen Wang wew [email protected] edu

Our Solution • Objective – Reduce total network-induced error for multiple control systems •

Our Solution • Objective – Reduce total network-induced error for multiple control systems • Cross-layer real-time scheduling – Inject the application demands into the network layer to change measurement deadlines dynamically – Assign smaller deadlines for more urgent application demands • Offline control system analysis Wenchen Wang wew [email protected] edu

Thanks! Wenchen Wang wew 50@pitt. edu

Thanks! Wenchen Wang wew [email protected] edu

Backup slides Wenchen Wang wew 50@pitt. edu

Backup slides Wenchen Wang wew [email protected] edu

Motivation: NPP demands • Multiple Small Modular Reactors (SMRs) in an NPP Do you

Motivation: NPP demands • Multiple Small Modular Reactors (SMRs) in an NPP Do you need this slide? Or the next one is sufficient? Wenchen Wang wew [email protected] edu

Power output RMSE Motivation: Observations 1 0. 8 delay=0. 1 s 0. 6 delay=0.

Power output RMSE Motivation: Observations 1 0. 8 delay=0. 1 s 0. 6 delay=0. 2 s RMSEs are similar 0. 4 delay=0. 3 s 0. 2 delay=0. 4 s 0 15 30 45 60 PCD (s) 75 90 105 120 delay=0. 5 s • For reference functions with shorter PCDs, the network delay becomes a more significant factor. Power output RMSE PCA: 10 MW; DR: 0. 9 0. 7 0. 6 0. 5 0. 4 0. 3 0. 2 0. 1 0 delay=0. 1 s RMSEs are similar delay=0. 2 s delay=0. 3 s delay=0. 4 s 10 8 6 PCA (MW) 4 2 PCD: 30 s; DR: 0. 9 Wenchen Wang wew [email protected] edu delay=0. 5 s • For reference functions with higher PCAs, the network delay becomes more significant factor.

Power output RMSE Motivation: observations 1 • 0. 8 delay=0. 1 s 0. 6

Power output RMSE Motivation: observations 1 • 0. 8 delay=0. 1 s 0. 6 delay=0. 2 s 0. 4 delay=0. 3 s 0. 2 Delay has more significant effect on the control system performance delay=0. 4 s 0 0. 9 0. 8 0. 7 Delivery ratio 0. 6 0. 5 delay=0. 5 s PCD: 30 s; PCA: 10 MW • Set a deadline according to the application demands – Small deadline for reference functions with less PCD or more aggressive PCA • Cross-layer dynamic schedule the network flows Wenchen Wang wew [email protected] edu

Problem Statement • Network flow – A set of end-to-end network flows – associates

Problem Statement • Network flow – A set of end-to-end network flows – associates with one source , a destination , a period , and a deadline, • Control systems application demands – Control systems have different reference functions with multiple ramps Required Power PHX 1 PHX 2 time • Objective: reduce total network-induced errors for multiple control systems: Wenchen Wang wew [email protected] edu