How to model an HVDC bi-pole outage in vSPD

  • Last post 13 December 2018
Tuong Nguyen posted this 11 December 2018


Somebody recently asked us how to model an HVDC bi-pole outage using vSPD. In this previous post I have described one of the ways to model a branch outage. Modelling an HVDC bi-pole outage is a bit more complex. Please note that this guidance relates to the use of vSPD in standalone mode and not vSPD-online

In order to model an HVDC outage we need to take the four HVDC branches out of service (open status = 1) and disable the reserve sharing mode. The code snippet below will do the trick. The piece of code should be inserted into vSDPSolve.gms as instructed in the previous post.

i_TradePeriodBranchOpenStatus(tp,'BEN_HAY1.1') = 1 ;

i_TradePeriodBranchOpenStatus(tp,'BEN_HAY2.1') = 1 ;

i_TradePeriodBranchOpenStatus(tp,'HAY_BEN1.1') = 1 ;

i_TradePeriodBranchOpenStatus(tp,'HAY_BEN2.1') = 1 ;

UseShareReserve = 0 ;

reserveShareEnabled(tp,resC) = 0  ;

Of course, there can be special cases that will need to be dealt differently. Please do not hesitate to reach out for assistance by posting quesiotns on this forum. We will try our best to help out.



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Tuong Nguyen posted this 13 December 2018

Hi Josheph,

Different days and/or trading periods have different demand, grid configuration. And market participants will make their offers/bids based on expected demand and grid configuation (and other factors on the day). 

Removing HVDC without modifying energy/reserve offer may give you indeasible prices because the offers was made based on the assumption that HVDC is in service.

So, I can't see any obvious way to achieve what you are trying to achieve.





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SpdJoe posted this 13 December 2018

Hi Tuong,

Thanks for the post!

I was wondering if there's a way to use another day's input such as the 11 Nov 2018 final pricing GDX file to simulate prices similar to 25 Nov 2018 final price (base case)?

Currently, I find if the HVDC poles are opened and use share reserve is disabled for 11 Nov 2018 as shown by your post:
- The nodal prices jump to infeasible levels ($4.5k+) which is not similar to the prices reflected on the 25 Nov 2018 (one of the days of recent HVDC outage).

Thank you,