Control-room Operation Measurement of Passive and Active System Strength (COMPASS)

The approach being used to achieve the project's goals is to simultaneously install system measuring equipment while evaluating the system strength methodology using simulation model. ​ 
Currently, system strength-based metrics, such as SCL (Short Circuit Level) and SCR (Short Circuit Ratio), use offline models combined with plant information to assess the stability and performance of both plant and system. This project will go one step further and use system measurements that are obtained using passive (events that happen on the system) and active (system will be perturbed by injecting a signal) measurements to develop a comprehensive view of system strength in the small and large signal domains.

Benefits

The project hopes to provide a better understanding of SCL and SCR levels in various locations across the GB network to understand regional differences​ and how they are changing, especially with more inverter-based resources on the system.
Project activities will include investigating whether an online/live measure for system strength is possible, which would allow for a better understanding of network operability challenges and how Inverter Based Resources (IBRs) impact operations.
The project will allow NESO to investigate how changes on the system impact system strength, allowing for correlations between how actions taken in the control room can influence system stability and potentially understand which actions could mitigate the proliferation of SSOs when there are higher shares of inverter-based generation. 

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