DER integration and maintaining power system security

The following reports outline analysis on DER integration and maintaining power system security while levels of DER grow:

  • Chapter 8 of the 2020 South Australian Electricity Report highlighting the challenges and opportunities associated with the high level of renewable energy resources in South Australia. The chapter includes a summary of DER integration issues, including unintended disconnection of distributed PV in disturbances, minimum demand thresholds, impacts of DER on under frequency load shedding, and the requirement for emergency PV curtailment capability.
  • Chapter 7 of the 2020 Electricity Statement of Opportunities discusses the challenges arising across the NEM relating to managing voltage, system strength and inertia in low load conditions. It highlights opportunities for managing the power system during low demand periods including active DER management, load shifting, using frequency control services and transmission voltage control services, and actions to take to mitigate risk including introducing emergency back stop mechanisms and improving DER performance.
  • Quantifying the Minimum operational demand threshold in South Australia, investigating operational challenges that could emerge as South Australia moves to lower levels of operational demand due to increasing growth in distributed PV
  • Contributions to the Renewable Integration Study (RIS) Appendix A, with the development of case studies on DER integration challenges in South Australia.
  • Appendix A of the Final 2020 Power System Frequency Risk Review – Stage 1 which explores the impacts of distributed PV on the operation of emergency frequency control schemes in South Australia in periods with high distributed PV generation.
  • An update on the progress to address issues identified with the Under Frequency Load Shedding (UFLS) in South Australia is outlined in section 6 of the Power System Frequency Risk Review – Stage 2 Final Report. This section also includes the proposed scope of the submission to the Reliability Panel for a new protected event relating to the separation of South Australia from the rest of the NEM.
  • A fact sheet on an updated and expanded constraint set to keep imports into South Australia across the Heywood interconnector within limits that reduce the risk of cascading failure and a black system if South Australia separates from the rest of the National Electricity Market (NEM).
  • A report investigating dynamic arming implementation for the Under Frequency Load Shedding (UFLS) scheme in South Australia. Dynamic arming, which enables UFLS circuits to be automatically disarmed when they are in reverse flows, is one of a suite of recommendations by AEMO to address issues with UFLS due to the high distributed DPV generation in the region.

This work has been conducted in partnership with SA Power Networks, ElectraNet, and the South Australian Government.

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