Operation of Davenport and Robertstown Synchronous Condensers
To fill the declared system strength gap in South Australia, ElectraNet is in the process of commissioning four large synchronous condensers, two at Davenport and two at Robertstown. Once these are commissioned AEMO will commence transitioning to new limits and generator combinations.
The two synchronous condensers at Davenport were energized and completed testing in the first week of August 2021. Two synchronous condensers at Robertstown are planned to be commissioned during September 2021.
AEMO and ElectraNet have conducted analysis to identify the impacts of these synchronous condensers on the system strength limit. It has been identified that higher asynchronous generation can be supported with these synchronous condensers in service, and that it will reduce the number of synchronous generators that are required to be online.
Transition to new limits/generator combinations
Transitioning to the new limits for the synchronous condensers online is a three-stage process.
- Stage 1 is the plant commissioning tests which are currently underway.
- Stage 2 is a monitoring period and will run for 2 to 4 weeks following completion of Stage 1. If no issues are observed starting at 2 weeks AEMO will progressively lift the constraint on asynchronous generation in SA.
- Stage 3 is an extended monitoring period which will run from 6 to 12 weeks after Stage 1. This stage is to transition to a minimum of two synchronous generators on-line.
During this monitoring period, if AEMO is not satisfied with the performance of the synchronous condensers, AEMO may extend this monitoring period and limit asynchronous generation in SA.
Prior to each change to limits or generator combinations AEMO will inform the market via a market notice.
The limits advice is available on the Congestion Information Resource limits advice page.
Once the synchronous condensers are commissioned outages will be notified via the Network Outage Schedule (NOS) and constraints implemented as required.