HVDC 2020 Outages

Transpower, as grid owner, has major outages of the HVDC poles scheduled in January to April 2020. Due to the extended period of these outages information and industry communication from the system operator will be published on this page.

These outages are required to:

  • reconductor the Churton Park section of the HVDC BEN-HAY circuits 1 & 2
  • replace Pole 2 control system equipment (VBE) at HAY and BEN converter stations and undertake the associated system testing required
  • undertake maintenance and inspections of HVDC equipment.

Outage Information

The outages can be viewed on POCP. Any changes to these outages will be communicated through POCP.  A calendar view of the outage is available below.

HVDC 2020 Outage Calendar [ pdf 30.03 KB ]

On 25th July the bipole outages were moved from weekdays to weekends as per the CAN below. This change is in response to System Operator advice based on possible tight generation margins when the bipole outages were scheduled on weekdays.

CAN Bipole outages changed to weekends for 2020 HVDC outages [  301.77 KB ]

 

Industry Briefings and Presentations

New Zealand Generation Balance (NZGB)

The System Operator publishes monthly reports of the NZGB for the next 200 days. Due to the significant period of these outages, the system operator has completed additional assessments for these outages in our monthly reports.

These reports can be found on the NZGB website.

Q&A

We have listed below common questions we have received from industry along with our responses. We will continue to update this section and share with participants any updates.

1

Can you please provide further clarification of the HVDC limits during the HVDC 2020 outages?

System Operator Response, 8 August 2019:

Please refer to the following document on limits:

HVDC Transfer Limits [ pdf 541.25 KB ]

2

Can you please provide descriptions for the following electrode outages in POCP?

System Operator Response, 8 August 2019:

  • HAY_THW_1A Outage Block Description: Haywards Te Hikowhenua Earth electrode 1A..
  • HAY_THW_1B Outage Block Description: Haywards Te Hikowhenua Earth electrode 1B.
  • BEN_BGR       Outage Block Description: Benmore Earth Electrode Circuit 1

3

Where can I find more information on the New Zealand Generation Balance assessment?

System Operator Response, 8 August 2019:

The System Operator produces a monthly report on the forecast generation balance. Our reports can be found on the NZGB website.

Currently our reports contain a section specifically on the HVDC 2020 outages and provide commentary on the current margins.

4

How does recent announced gas outages affect generation balance margins?

System Operator Response, 8 August 2019:

Currently our NZGB reports contain a section specifically on the HVDC 2020 outages and provide commentary on the calculated margins.

5

How will lake levels affect the generation balance margins?

System Operator Response, 8 August 2019:

It is too early to make a call on any impact of hydrology.  We will be monitoring our electricity risk curves over the coming months, and will have a clearer picture of expected lake levels towards the end of this year.  

6

What HVDC risks and limitations are included in the NZ generation balance calculations?

System Operator Response, 8 August 2019:

Our calculations assume that the HVDC transfer is to the full capacity of each pole available. NZGB then calculates the reserves needed to cover the loss of the largest risk based on this assumption.  Our user guide available in NZGB provides more detail on our HVDC assumptions in sections 2.8 and 2.9, pages 24 onwards. 

7

What happens if P2 system testing finishes early. Will the start of the P3 outage be brought forward?

Grid Owner Response, 8 August 2019:

If Pole 2 system testing is completed early, Transpower would look to make Pole 2 available for market operation and commence the Pole 3 outage for BEN-HAY-1 reconductoring work. Any changes to the Pole 2 test period or the start of the Pole 3 outage would be advised to the industry via a CAN. An update on this will be given at the next industry briefing (30th October).

8

What happens if HVDC transfer North does not reach 400 MW at the time of Pole 2 testing?

Grid Owner Response, 8 August 2019:

Work to finalise the test programme with the System Operator is currently in progress, and as discussed we expect some tests may require HVDC transfers up to 400 MW. This requirement although desirable may not be essential. This work is ongoing and an update will be provided at the next industry briefing (30th October).

 

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