Rule Changes: Open

Emergency frequency control schemes

Reference:
ERC0212
Stage:
Publication of Draft Determination
Proponents:
South Australian Minister for Mineral Resources and Energy
Project Leader:
Claire Rozyn
Date initiated:
08-Sep-2016
Overview

On 22 December 2016, the AEMC published a draft rule and draft rule determination on the Emergency Frequency Control Scheme rule change request.

On 22 December 2016, the AEMC published a draft rule and draft rule determination on the Emergency Frequency Control Scheme rule change request.

The draft rule establishes an enhanced framework for emergency frequency control in the National Electricity Market. The draft rule includes:

  • an enhanced emergency frequency control scheme framework to allow for the efficient use of all available technological solutions to limit the consequences of emergency frequency events, including a formalised arrangement for the management of over-frequency events.
  • a new classification of contingency event, the protected event, that in the circumstances defined by such an event, will allow power system security to be managed by using a combination of ex-ante solutions, as well as load shedding.

An enhanced emergency frequency control scheme and protected events will support security of supply for consumers. However, it is important these measures are delivered efficiently, so that costs for consumers are as low as possible. The draft rule sets out clear governance arrangements for both, including a robust cost benefit process, to achieve this outcome.

Background

Emergency under-frequency and over-frequency control schemes are the last line of defence to maintain the power system following a major disturbance. They are central to keeping the power system secure.

The South Australian Minister for Mineral Resources and Energy submitted two rule changes that were designed to enhance the frameworks for emergency frequency control schemes.  These rule change requests asked the AEMC to consider various matters including:

  • Clarifying the roles and responsibilities of different parties.
  • Developing a new sub category of non-credible contingency event for which AEMO should maintain system frequency.
  • Developing a new framework in the NER for the development of a scheme to deal with over-frequency events.

As these two rule change requests relate to similar matters, the AEMC has decided to consolidate them under s.93(1) of the National Electricity Law.

This rule change is related to a broader package of work being progressed by the AEMC and AEMO related to power system security. The AEMC’s System Security Market Frameworks review (the System Security review) is considering power system security issues and various regulatory/market frameworks that might be used to address these issues. On 15 December 2016, the AEMC published an interim report for the system security review.

View more View less

Documentation