Constraint Breakdown 2021-2022

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
`https://api.neso.energy/api/3/action/datastore_search`
Query (via SQL)
`https://api.neso.energy/api/3/action/datastore_search_sql`

Query example (first 5 results)
`https://api.neso.energy/api/3/action/datastore_search?resource_id=419337fb-f609-45e3-9097-798a41b4b3de&limit=5`
Query example (via SQL statement)
`https://api.neso.energy/api/3/action/datastore_search_sql?sql=SELECT * from "419337fb-f609-45e3-9097-798a41b4b3de" LIMIT 5`

A simple ajax (JSONP) request to the data API using jQuery.

var data = {
  resource_id: '419337fb-f609-45e3-9097-798a41b4b3de', // 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=419337fb-f609-45e3-9097-798a41b4b3de&limit=5'
  fileobj = urllib2.urlopen(url)
  print fileobj.read()

Download (CSV)

Data Explorer

Table Information

Date

Title	Date
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

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Constraint Breakdown 2021-2022

CKAN Data API

Data Explorer

Data Explorer

Table Information

Date

Reducing largest loss cost

Increasing system inertia cost

Voltage constraints cost

Thermal constraints cost

Reducing largest loss volume

Increasing system inertia volume

Voltage constraints volume

Thermal constraints volume