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D15: C-RAS System Monitors System Status and Exerts Control to Maintain System Stability and Prevent Overloads

This use case describes how centralizing and coordinating Remedial Action Schemes (RAS) in a Centralized Remedial Action Scheme (C-RAS) architecture can improve SCE’s ability to respond to contingencies in real-time to maintain system stability. RASs are used to detect abnormal grid conditions involving transmission line or transformer outages in congested transmission corridors, and to mitigate these conditions by taking pre-planned corrective actions. Corrective action can include generation runback or tripping, load shedding, or system configuration changes. Recent increases in the number of new RASs, limitations with existing RAS technology, and interactions between overlapping RASs has complicated SCE’s ability to manage them. C-RAS addresses these limitations by offering a centralized platform that coordinates and optimizes the various RASs. C-RAS operates through a high-speed communications network, increasing the speed of SCE’s response to an event. The business value of C-RAS includes improved system reliability, reduced costs, improved customer benefits and increased renewable energy.

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Southern California Edison
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