Cyber-Physical Integration of System Integrity Protection Schemes in Thailand: From Simulation to Real-Time Operation

(SIPS) provide fast and automatic responses to abnormal and emergency conditions. This paper presents a practical application of cyber-physical system planning in Thailand’s transmission network, demonstrating how simulation-based studies are translated into real-time SIPS implementation.

The proposed framework integrates power system simulations with physical control infrastructure to develop implementable SIPS logic for voltage, thermal, and transient stability issues. The logic is deployed through high-speed digital automation integrated with

SCADA/EMS, RTUs, fiber-optic and protection relays, enabling real-time execution and monitoring. A cross-border SIPS between Northeastern Thailand and Lao PDR executed automatic load shedding in Lao PDR within 100 milliseconds after a command from Thailand’s

National Control Center, preventing thermal overloads and cascading trips leading to widespread blackout. Currently, 70 SIPS schemes are in operation across Thailand’s transmission system, resulting in reduced restoration times, fewer operator interventions, and improved operational efficiency. The results confirm that modelling-based cyber-physical SIPS planning is practical, scalable, and field-proven.