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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 September 2014 by the PA Consulting Group. Their approach to testing and the statement by the PA Consulting Group of vSPD's fitness for use are explained in the vSPD certificate of compliance.

vSPD certificate of compliance

Last updated: 12th September 2014

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 3.0.3 of vSPD is consistent with commit 787d9a1 on the vSPD GitHub repository.

Most recent version of vSPD

Last updated: 1st March 2017

Last audited version of vSPD

Last updated: 12th September 2014

vSPD education
vSPD-online: Getting started and fundamentals

Category  - Wholesale 14 months ago

Wholesale price/demand sensitivity

Category  - Wholesale 32 months ago

GDX files for vSPD

Category  - Wholesale 32 months ago

vSPD education
vSPD-online: Getting started and fundamentals

Category  - Wholesale 14 months ago

Wholesale price/demand sensitivity

Category  - Wholesale 32 months ago

GDX files for vSPD

Category  - Wholesale 32 months ago

Latest vSPD-online jobs
Huntly peaker test

Testing whether peak offer at Huntly will be useful.. for yesterday.

Created by  - Dougal McQueen 7 days ago

Jobberry

They took our jobs

Created by  - Charles Chrystall 8 days ago

Test job

Test job using base case

Created by  - josephkim 51 days ago

Electricty job 3

Electricty job 3

Created by  - Rachel Langford 2 months ago

geoff_test_run

Trying out vspd online

Created by  - geoff_ey 2 months ago

Latest vSPD discussions
How to model an HVDC bi-pole outage in vSPD

Category  - Wholesale 42 days ago

Which solver to use with vSPD?

Category  - Wholesale 2 months ago

vSPD-online: Getting started and fundamentals

Category  - Wholesale 14 months ago

How are outages modeled in vSPD?

Category  - Wholesale 18 months ago

Running vSPD on Linux

Category  - Wholesale 18 months ago

Latest vSPD discussions
How to model an HVDC bi-pole outage in vSPD

Category  - Wholesale 42 days ago

Which solver to use with vSPD?

Category  - Wholesale 2 months ago

vSPD-online: Getting started and fundamentals

Category  - Wholesale 14 months ago

How are outages modeled in vSPD?

Category  - Wholesale 18 months ago

Running vSPD on Linux

Category  - Wholesale 18 months ago