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DC 0079 - Frequency Changes during Large Disturbances and their effect on the total system - Phase 2

As of 1 October 2017 Grid Code Modifications GC 0036 and GC 0079 have now been superseded by Distribution Code Modification DC 0079.

Please note: all documents on the Grid Code GC 0079 web page will remain accessible as an archive to this new Distribution Code website area. As of 01 October 2017 all new documentation for Modification DC 0079 will only be available on the Distribution Code website. Access to the GC 0079 web page can be found here - http://www2.nationalgrid.com/UK/Industry-information/Electricity-codes/Grid-code/Modifications/GC0035-GC0079/

DCRP DC 0079 working group - Terms of Reference

Reports to Authority

REPORT TO AUTHORITY

Status

Approved by the Authority, Awaiting Implementation

Proposer

The Distribution Code Review Panel - www.dcode@energynetworks.org
020 7706 5105

Summary

It is recommended that the Distribution Planning Code and EREC G59 should be changed to ensure that all existing embedded generators make changes to comply with the following:

  1. That where rate of change of frequency (RoCoF) protection relays are used, as part of Loss of Mains protection, the applied setting should be 1Hzs-1 with a definite time delay of 500ms.
  2. That vector shift protection technique should be removed where it is in use as Loss of Mains protection.
  3. That existing Loss of Mains protection settings for type-tested generators need not be changed.
  4. Any existing over-frequency setting relays still set at 50.5Hz should if possible be reset to 52.0Hz.
Given the retrospective nature of the proposed change, the workgroup recommends the creation of an implementation team, with the governance, resourcing and stakeholder representation necessary to assure efficient and effective implementation of the proposed changes.

Impact

High Impact:
All non-type-tested embedded generators with plant rated >16A per phase commissioned before 1 February 2018

Medium Impact:
None

Low Impact:
None
Working GroupDCRP DC0079 Working Group

Consultation

The Distribution Code public consultation sought views from industry stakeholders on the modification to both the ‘DCode’ and Engineering Recommendation (EREC) G59 and EREC G83. It was published on the 31 January 2018 with a deadline for responses by 23 February 2018.

DCRP/18/04/PC Consultation Pack

Report to Authority

Following the meeting of the Distribution Code Review Panel (the Panel) held on 7th February 2019, it was agreed that the Report to Authority would be amended with minor changes before submission of the Report to Authority for approval. The Panel agreed to this submission and that the modification proposals better facilitate the objectives of the Distribution Code.

Subject to the agreement of the Authority the modification should be implemented from the date the revised Distribution Code is published. This date is proposed as 01 May 2019.

DC0079 Retrospective Action Report to Authority

DC0079 Retrospective Action Report to Authority Annexes

Authority Decision

The Authority has approved DCRP/MP/18/08 - Report to Authority - DC0079 Frequency Changes during Large Disturbances and their Impact on the Total System on 05 August 2019 with an implementation date of 01 September 2019.
DCRP/MP/18/08 - Authority Decision

Report to Authority DC0079 (Phase 2) - 27 March 2018

The purpose of this report is to assist the Authority in its decision to implement the proposed modifications to the Distribution Code Engineering Recommendations G59 and G83. The proposed modifications were subject to industry consultation in August 2017 and February 2018. During the August Consultation no response was received from manufacturers of type tested plant. As a result a second consultation was undertaken in February 2018 and one response was received from a type tested plant manufacturer. The manufacturer did not object to the proposal but proposed a delay in the implementation date.

It is recommended that modifications be made to Distribution Code and Engineering Recommendations G59 and G83 to mandate that all type tested generators commissioned on or after July 2018, demonstrate stability for appropriate RoCoF and vector shift disturbances. The report recommends:

a) That the rate of change of frequency (RoCoF) criterion used for Loss of Mains protection must be 1 Hzs per second with a definite time delay of 500ms

b) That vector shift protection technique should not be used as Loss of Mains protection for type tested generators and that generation must not trip for vector shifts of up to 50o

c) That type tested generation includes stability tests to prove immunity to RoCoF and vector shift less than the above criteria.

Report

Report Annexes

Decision of Authority - 3 May 2018

REPORT TO AUTHORITY

Report to Authority DC0079 (Phase 1) - 4 December 2017

The purpose of this Report is to assist the Authority in its decision to implement the proposed modifications to the Distribution Code and Engineering Recommendations G59. The proposed modifications were subject to industry consultation in August 2017. Responses from this consultation show that the industry is in favour of these modifications.

The Distribution Code Review Panel recommended that modifications are made to the Distribution Code and Engineering Recommendations G59 to mandate that all non type tested embedded generators with a commissioning date on or after 1 February 2018 comply with the following:

  1. That where rate of change of frequency (RoCoF) protection is used as Loss of Mains protection, the applied setting should be 1Hzs-1 with a definite time delay of 500ms.
  2. That all generation using discrete relays (non- type-tested) as part of their loss of mains technique should demonstrate stability for appropriate RoCoF and vector shift disturbance
  3. That vector shift protection technique should not be used as Loss of Mains protection for generators using discrete relays as part of loss of mains protection scheme.

Report

Report Annexes

DECISION OF AUTHORITY - 15th December 2017

The Authority has approved this modification. Full details of Ofgem's decision can be found in their decision letter which can be found here. The resultant modifications to the Distribution Code and Engineering Recommendation G59-3/3 will become effective from 1 February 2018.

2017 Meeting Dates

Work Group Meeting Dates 2017

October

Agenda

Papers

Actions

November

Agenda

Papers

Actions

December

Agenda

Papers

Minutes and actions

FAQ

Q1- What is DC0079

A1- DCRP Mandated WG

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