Power System Frequency Risk Review Consultation

Market National Electricity Market
StageFirst Stage
ConvenorAEMO NEM
Accepting submissions?Yes
Submissions close17/07/2020

Matter Under Consultation 

The Power System Frequency Risk Review (PSFRR) is an integrated, periodic review of major power system frequency risks associated with non-credible contingency events in the National Electricity Market (NEM). 
In accordance with Clause 5.20A.1 of the National Electricity Rules (NER), AEMO is undertaking a PSFRR for the NEM, considering:  

  • Non-credible contingency events which AEMO expects could involve uncontrolled frequency changes leading to cascading outages or major supply disruption. 
  • Current arrangements for managing such non-credible contingency events, including the performance of existing emergency frequency control schemes (EFCSs).  
  • Options for future management of such events. 

AEMO is developing the 2020 PSFRR in a staged approach to ensure it appropriately identifies and addresses key operational risks within the scope of the review. The stage 1 PSFRR report has been developed after initial consultation with transmission network service providers (TNSPs) and includes:  

  • A review of relevant non-credible incidents since the 2018 PSFRR that have caused significant frequency deviations, including the adequacy of actions taken to manage their impact. 
  • Observations about emerging risks based on operational experience, the changing generation mix and the impact of climate conditions. 
  • A recommendation to declare a new protected event to manage risks arising from non-credible separation of South Australia from the rest of the NEM in periods where available EFCSs are unlikely to prevent cascading failures and potentially a black system in South Australia.  
  • A list of other non-credible contingency events to be prioritised for analysis in Stage 2 of the 2020 PSFRR. 

In stage 2 of the PSFRR, AEMO will consult more extensively with both TNSPs and other key stakeholders, particularly distribution network service providers, in relation to the identified priority events. The stage 2 report, currently targeted for December 2020, will report on: 

  • Development of frequency control models to adequately assess system frequency performance and risks. 
  • Detailed studies to assess EFCS adequacy in response to identified priority non-credible contingencies, and recommendations for modifications or additional schemes if appropriate. 
  • Adequacy and cost of managing the current protected event declared for non-credible loss of generation in South Australia in forecast destructive wind conditions. 
  • Consideration of recommendations for further protected events if justified based on the analysis.   

Consultation Process 

AEMO is seeking email submissions on the draft stage 1 report from all persons interested in the PSFRR. Submissions will contribute to the finalisation of the PSFRR stage 1 report, including its recommendations and considerations for the PSFRR stage 2 report. In particular, AEMO is seeking stakeholder feedback regarding: 

  • AEMO’s recommendation to declare a new protected event for non-credible separation of Victoria and South Australia.  
  • The priority non-credible contingencies to be assessed as part of the PSFRR stage 2 report. 
  • Other suggestions or recommendations to enhance the PSFRR. 

If you would like to make a submission, please email it to 2020PSFRR@aemo.com.au. Written submissions will be accepted until 17 July 2020. Submissions will be published on AEMO’s website. Please indicate to AEMO if there are any parts of your submission you would like kept confidential.  
AEMO will also hold a Q&A session via Webex on Thursday 9 July 2020 at 10:00am AEST. This will provide an opportunity to discuss the PSFRR and answer any questions you may have about the review.  

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