Review of high spring washer resolution issue with SFT

Prior to the introduction of the simultaneous feasibility test (SFT) in March 2011, security constraints were applied manually, with one constraint being applied to parallel lines.

In this section:

Stage: II (Review)

Status: Complete

Date commenced: 18/08/2011

Since the introduction of SFT, different but very similar constraints can be applied to parallel transmission lines. The similar constraints undermine the ability of the high spring washer resolution process to mitigate extreme prices.

This report elucidates the underlying high spring washer resolution issue through analysis of some recent market situations.