Skip to main content
  1. Wholesale category
  2. Tools
  3. vSPD

vSPD overview

vSPD stands for vectorised Scheduling, Pricing and Dispatch. The vSPD model is a precise replica of SPD. It is written and solved using the GAMS software and is based on the published SPD formulation.

vSPD takes advantage of the computational efficiency of modern linear programming and mixed integer programming solvers through vectorisation of some schedules prior to solving. Vectorisation involves reformulating the sequential, independent trading period problems as a single optimization and therefore requires just a single solve for the entire vectorised set of schedules. In other words, vSPD is generally configured to solve an entire day, or 48 trading periods, at once.

The input data for vSPD is provided in the form of GDX files. Daily GDX files for use in vSPD can be found in Datasets.

vSPD output is generated as a collection of GDX and CSV files that report on the key model outputs such as generation, prices, branch flows and reserves. Some inputs to the model, for example load, are also included in the output reports.

An online version of vSPD called vSPD-online is available for use from within a web browser and without the need to learn GAMS or acquire the GAMS software. Under the hood, vSPD-online is identical to vSPD, it uses the same input GDX files, and will generate an identical solution to an equivalently configured run of vSPD. However, the range of what-if scenarios that can be explored, while still quite substantial, is less than can be undertaken by users that have access to vSPD.

Audit and certificate of compliance

vSPD is regularly audited by the same independent auditors contracted by the system operator to audit SPD each time a change to the SPD formulation is implemented.

The most recent audit of vSPD was undertaken in August 2019 by Robinson Bowmaker Paul (RBP). The RBP approach to testing and their statement of vSPD's fitness for use are explained in the vSPD certificate of compliance.

vSPD certificate of compliance

Last updated: 29 August 2019

Download and install vSPD

Development of vSPD is ongoing. Soon after vSPD has been audited, it is likely to be modified in some way although at all times it will replicate SPD for all published schedules. We don’t have vSPD audited after every modification; some changes are quite trivial. Version 3.0.4 of vSPD is consistent with commit 967c236 on the vSPD GitHub repository.

Most recent version of vSPD

Last updated: 19 September 2019

Last audited version of vSPD

Last updated: 29 August 2019

vSPD education
vSPD-online: Getting started and fundamentals

Category  - Wholesale 30 months ago

Wholesale price/demand sensitivity

Category  - Wholesale 49 months ago

GDX files for vSPD

Category  - Wholesale 2 months ago

vSPD education
vSPD-online: Getting started and fundamentals

Category  - Wholesale 30 months ago

Wholesale price/demand sensitivity

Category  - Wholesale 49 months ago

GDX files for vSPD

Category  - Wholesale 2 months ago

Latest vSPD-online jobs
aug1_no_ovrd

aug 1 no override

Created by  - jonathan 25 days ago

thermal_aug1-2_v3

aug 1-2, tps1-5, using aug1-2_thermal_ovrd3

Created by  - jonathan 29 days ago

aug1-2_no_ovrrd

aug 1-2, tps 1-5, no override

Created by  - jonathan 29 days ago

thermal_aug1-2_v2

same as v1 but using override with tps vs datetimes

Created by  - jonathan 30 days ago

aug1-2_thermal_ovrrd

aug 1-2 using thermal override

Created by  - jonathan 30 days ago

Latest vSPD discussions
GDX files for vSPD

Category  - Wholesale 2 months ago

vSPD training workshop – Feb 2020

Category  - Wholesale 3 months ago

Adding a new offer to the vSPD input data

Category  - Wholesale 12 months ago

How to model an HVDC bi-pole outage in vSPD

Category  - Wholesale 18 months ago

Latest vSPD discussions
GDX files for vSPD

Category  - Wholesale 2 months ago

vSPD training workshop – Feb 2020

Category  - Wholesale 3 months ago

Adding a new offer to the vSPD input data

Category  - Wholesale 12 months ago

How to model an HVDC bi-pole outage in vSPD

Category  - Wholesale 18 months ago