Latency viewed as a stochastic process and its impact on wide area power system control signals

A method of calculating the communication delay (latency) for measurements and control signals in a power system is shown. The basis of the calculation is a dedicated communication channel for control signals. The time delay calculation is examined using a dynamic equivalent of the Western Electricity Coordinating Council transmission system. The impact on control system response is discussed. The application given is a wide area control system for interarea mode damping. Results demonstrate that control signal latency can degrade the performance of controls in a wide area control system. Index Terms--Damping, latency, network delay, power system control, power system stabilizer, queuing, wide area control systems, wide area measurement systems.