1. Connection of Large – Scale Renewables to the Energy Queensland Network
1st May 2018
Presented by Chris Barker

2. Who are Energy Queensland?
Merger between Ergon Energy (regional) and Energex (metro) electricity distribution entities
Services all of Queensland

3. Large Scale Renewable Connection
1,200 MW committed at April 2018 over 23 plants

4. Process Overview
Simplified process:

5. Preliminary Enquiry Response (PER)
Contains system information:
Capacity of lines and substations
System stability information, including committed generation
Indicative options for connection
Indicative costs for progressing to Application to Connect
Collation of publicly available information

6. Site Specific Advice Optional Could be: options analysis, or
an investigation such as confirming conductor stringing

7. Detailed Enquiry Response (DER)
Planning report on single option
Detailed scope and cost analysis
System strength information
Information for progressing to an Application

8. Application Information required to progress an application:
Completed application form and fee
Single-line diagrams
Site location and layout
Inverter data sheets
Detailed Enquiry Response from Energex or Ergon Energy
Proposed GPS and GPS report
RUG (Releasable User Guide)
Confirmation from supplier of validity of model at low SCR and minimum SCR operation
Site-specific, tuned PSCAD model
PSSE model
Benchmarking report of PSSE and PSCAD

9. Who will you be dealing with?
Connections Solutions
Project Sponsor
Project scoping and estimating
Contracts and Agreements
Network Connections
Verification of network capacity
Steady state analysis
Constraint management
GPS compliance
Dynamic analysis and full system impact assessment

10. Issues Control mode Undersized plant
Control modes have pros and cons – understand what the implications are before deciding
Control mode can have an effect on the control system complexity and design
Costs and time increases can occur by not considering implications
Undersized plant
Can cause problems with reactive capability and fault ride through
Inaccurate PSCAD models leading to extensive back and forth
More work upfront results in smoother due diligence
Considerations of loss factors to financial viability
Aim for automatic access
EQ has weak network – the better the plant can perform, the fewer issues will occur
Harmonics – a harmonic filter can take >6 months to design and manufacture

11. System Strength Change 1st July 2018
Full Assessment will now be responsibility of DNSP
A Preliminary System Strength Assessment will be made at the DER stage
A Full Assessment will occur after Application to Connect
Proponent’s model will be included in network model
If remediation is required, the DNSP will inform the proponent
The proponent may disagree and complete their own modelling
Possible remediation:
FACTS devices or synchronous condensers
Upgrade to network infrastructure

12. Useful links