Constraint Breakdown 2018-2019
This file contains a breakdown of constraint actions into the following categories - Inertia (reducing largest loss and increasing system inertia), Voltage, and Thermal. Costs and Volumes are shown.
CKAN Data API
Access resource data via a web API with powerful query support.
Further information in the main CKAN Data API and DataStore documentation.
The Data API can be accessed via the following actions of the CKAN action API.
Query example (first 5 results) |
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https://api.neso.energy/api/3/action/datastore_search?resource_id=26af8438-1824-4436-9bbd-d397a9a517e2&limit=5
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Query example (via SQL statement) |
https://api.neso.energy/api/3/action/datastore_search_sql?sql=SELECT * from "26af8438-1824-4436-9bbd-d397a9a517e2" LIMIT 5
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A simple ajax (JSONP) request to the data API using jQuery.
var data = { resource_id: '26af8438-1824-4436-9bbd-d397a9a517e2', // the resource id limit: 5 // get 5 results }; $.ajax({ url: 'https://api.neso.energy/api/3/action/datastore_search', data: data, dataType: 'jsonp', success: function(data) { alert('Total results found: ' + data.result.total) } });
A simple ajax (JSONP) request to the data API using jQuery.
import urllib2 url = 'https://api.neso.energy/api/3/action/datastore_search?resource_id=26af8438-1824-4436-9bbd-d397a9a517e2&limit=5' fileobj = urllib2.urlopen(url) print fileobj.read()
Data Explorer
Data Explorer
Table Information
Date
Title | Date |
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Type | date |
Description | The date of the costs/volumes. |
Comment | |
Example | 2021-04-04 |
Unit | ISO 8601 |
Reducing largest loss cost
Title | Reducing largest loss cost |
---|---|
Type | number |
Description | At times of low inertia we must take more actions to keep the potential RoCoF below trigger points. We limit RoCoF by limiting the largest credible loss. Trading or taking BM Actions can reduce the level of the generation or demand that comprises the largest loss. eg. reducing generation output in one area whilst increasing generation output elsewhere. Or reducing demand or export on an interconnector and reducing generation output to balance. Reducing the potential largest loss on the system reduces the RoCoF on the system that would ocur in the event of that loss. The costs of these Trading and BM Actions are shown here. |
Comment | |
Example | 2128995 |
Unit | £ |
Increasing system inertia cost
Title | Increasing system inertia cost |
---|---|
Type | number |
Description | Increasing the level of inertia on the system can also reduce RoCoF. Taking BM Actions to increase synchronous generation can increase inertia. The costs of these BM Actions are shown here. |
Comment | |
Example | 9195 |
Unit | £ |
Voltage constraints cost
Title | Voltage constraints cost |
---|---|
Type | number |
Description | Reactive power needs to be kept in balance to keep the voltage at the right level. Voltage requirements can vary from one region to another. Trades and BM Actions can support Voltage Control. The costs of these actions are shown here. |
Comment | |
Example | 120288 |
Unit | £ |
Thermal constraints cost
Title | Thermal constraints cost |
---|---|
Type | number |
Description | Thermal constraints are taken when the amount of energy that would flow naturally from one region to another exceeds the capacity of the circuits connecting the two regions. Thermal constraints can be managed by Trades or BM Actions. The costs of these actions are shown here. |
Comment | |
Example | 2132332 |
Unit | £ |
Reducing largest loss volume
Title | Reducing largest loss volume |
---|---|
Type | number |
Description | At times of low inertia we must take more actions to keep the potential RoCoF below trigger points. We limit RoCoF by limiting the largest credible loss. Trading or taking BM Actions can reduce the level of the generation or demand that comprises the largest loss. eg. reducing generation output in one area whilst increasing generation output elsewhere. Or reducing demand or export on an interconnector and reducing generation output to balance. Reducing the potential largest loss on the system reduces the RoCoF on the system that would ocur in the event of that loss. The volumes of these Trading and BM Actions are shown here. |
Comment | |
Example | -47450 |
Unit | MWh |
Increasing system inertia volume
Title | Increasing system inertia volume |
---|---|
Type | number |
Description | Increasing the level of inertia on the system can also reduce RoCoF. Taking BM Actions to increase synchronous generation can increase inertia. The volumes of these BM Actions are shown here. |
Comment | |
Example | 2047 |
Unit | MWh |
Voltage constraints volume
Title | Voltage constraints volume |
---|---|
Type | number |
Description | Reactive power needs to be kept in balance to keep the voltage at the right level. Voltage requirements can vary from one region to another. Trades and BM Actions can support Voltage Control. The volumes of these actions are shown here. |
Comment | |
Example | 17140 |
Unit | MWh |
Thermal constraints volume
Title | Thermal constraints volume |
---|---|
Type | number |
Description | Thermal constraints are taken when the amount of energy that would flow naturally from one region to another exceeds the capacity of the circuits connecting the two regions. Thermal constraints can be managed by Trades or BM Actions. The volumes of these actions are shown here. |
Comment | |
Example | 16436 |
Unit | MWh |