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This paper presents Audited Selective Verification, a novel approach for real-time N-1 contingency screening in energy management systems that balances the trade-off between verification assurance and operational cost. By employing a surrogate model to identify outages that can be skipped and conducting online audits on a random sample, the method ensures that the thermal violation rate remains within a specified budget, even under deployment shifts. The results demonstrate that this approach significantly reduces the need for full power-flow studies by 29 to 75 percent while maintaining safety, outperforming traditional deterministic and calibrated screens in scenarios with operational shifts.
Audited Selective Verification cuts the need for full power-flow studies by up to 75% while ensuring safety in energy management systems under deployment shifts.
Real-time N-1 contingency screening in an energy management system trades assurance against cost: verifying every credible outage with full power flow is too slow, while fast linear-sensitivity screening gives no statistical guarantee and can silently pass unsafe operating points, especially when a controller drives the system into unfamiliar regimes. This paper introduces Audited Selective Verification, a risk-budgeted screening and triage layer for any controller's output (optimization, model-predictive, or learned). A cheap surrogate proposes which outages to skip; an online audit runs full power flow on a small random sample each window; and a calibrated threshold certifies a thermal-violation-rate bound for the skipped set at a chosen budget and confidence, with a corresponding bound for the unverified trusted subset. Validity rests on real verification and the audit rather than on surrogate accuracy, so it holds under arbitrary deployment shift. It is a risk-budgeted screen, not a replacement for deterministic verification when policy requires checking every credible contingency. On three public transmission systems up to 1354 buses, the realized violation rate stays within budget, standard deterministic and calibrated screens become unsafe under shift, and the method cuts full power-flow studies by 29 to 75 percent per real-time operating point.