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A new technical standard for generating systems connected via low voltage power inverters to the South Australian distribution network requires that they meet ride-through standards as demonstrated by testing in accordance with testing standards in AS/NZS4777.2 and any applicable AEMO testing standard.

The standard is in effect as of 28 September 2020 and contributes to ensuring new and replacement inverter connected distributed energy resources can ride through power system disturbances.

The Australian Energy Market Operator (AEMO) has reported disconnection of large portions of the grid connected power inverter fleet in South Australia during disturbances which resulted in brief low voltage excursions. This appears to be due to some models of inverters disconnecting immediately upon measuring a grid voltage below the minimum set by Australian Standards.

From 28 September 2020 any generator connected via an inverter to the SA Power Networks distribution network must comply with new undervoltage ride-through performance standards designed to mitigate impacts on the South Australian power system during disturbances.

These requirements also apply to existing electricity generating plant connected via an inverter when the current inverter is being replaced, unless that inverter is being replaced under warranty.

Additionally, an exception applies if the intended owner or operator (or their agent) of the plant had submitted an application to connect to SA Power Networks’ distribution network on or before 10 August 2020.

On 28 July 2020, the Australian Energy Market Operator (AEMO) published the Short Duration Undervoltage Ride-Through (VDRT) Test Procedure which details testing and reporting requirements. Further information can be found on the AEMO website.

Manufacturers and their importers can enter into a legally binding arrangement with the Technical Regulator to be provided a transitional period to 31 March 2021 to complete their manufacturer testing where certain conditions are met. The conditions are:

  • Evidence of test reports showing the inverter meets the testing procedure
  • Commitment to complete the testing by 31 March 2021
  • Commitment to make good any inverter installed in South Australia during the transitional period if the Low voltage ride-through requirement inverter fails the test through the testing lab at no cost to the customer, installer or supplier.

List of approved inverters

Inverters included in this section are devices where a manufacturer has provided evidence to the Technical Regulator that they comply with the AEMO VDRT test above, and where the manufacturer will submit the undertaking document below to the Technical Regulator on commencement of the new regulations.

Those inverters which are approved for installation are described in the list of approved inverters.
List of approved inverters
Note that this list of inverters will be frequently updated.

How to submit inverter test results

Test results may be submitted to the technical regulator via
These must be accompanied by the following:

Note that the undertaking must be submitted to the OTR on 25 September 2020 for related inverters to remain on the list of approved inverters.