Successes
- Raising Transfer Levels
- Avoiding Blackouts
- Stabiliser Tuning
- Early Release of Interconnector Capacity
- Prompt Detection of Poor Damping
- Generator Commissioning
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Identifying Sources of Damping
When poor damping is detected in the power system, it is useful to determine the cause of the problem. This may not be obvious from the model, as not all oscillations are well-represented in the system model. A damping issue was observed on a major power system by the system operator and investigated to identify the source of the problem.
The problem was identified to a particular region through wide-area monitoring. EMS records of active and reactive power from transmission lines and generator feeders were aligned with the dynamics records, and the changes in the system conditions that coincided with changes in dynamics were studied. It was found that the issue arose when a particular generator was operating with a near-zero or leading power factor.
In response, an operational constraint was applied on the reactive power from the generator, and a review of the controller design was recommended for the medium to long-term. Having applied the constraint, the occurrences of poor damping of that mode ceased. The problem was resolved before it caused any major disturbance to the operation of the system.