Assessment of Risks Resulting from the Adjustment of ROCOF Based Loss of Mains Protection Settings

Abstract:

This document contains a report on Phase II of the work undertaken by the University of Strathclyde and commissioned by the Energy Network Association on behalf of the workgroup "Frequency changes during large system disturbances" (GC0079). The workgroup is a joint activity of the UK Grid Code Review Panel (GCRP) and Distribution Code Review Panel (DCRP) which addresses the issue of system integrity under anticipated future low inertia conditions. The original terms of reference for this work issued by ENA in April 2014 are included in Appendix D of this report.

The aim of the work described in this report is to assess and quantify the risks associated with proposed changes to ROCOF protection settings from the point of view of undetected islands and the consequent risks to individuals' safety, as well as the risk of potential equipment damage through unintentional out-of-phase auto-reclosing.

1. Executive Summary
2. Introduction
3. WP2 - Simulation based assessment of NDZ
4. WP3 - Risk level calculation at varying NDZ
5. Conclusions
6. References

• Appendix A: Simulation model parameters
• Appendix B: Detailed record of NDZ Assessment
• Appendix C: Full record of risk assessment results
• Appendix D: Terms of Reference

Publication Year:

2015

Publisher:

Ofgem

DOI:

No DOI minted

Author(s):

Dysko, A., Tzelepis, D. and Booth, C.