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Name Forooz Ghassemi (National Grid)

Distribution Code Public Consultation – DCRP/19/03/PC – Stage 3 Worked Example– Stakeholder Engagement Dissemination Event. Name Forooz Ghassemi (National Grid) Company Energy Networks Association – Code Administrator – Distribution Code of Great Britain Date 1 st April 2019. Content.

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Name Forooz Ghassemi (National Grid)

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  1. Distribution Code Public Consultation – DCRP/19/03/PC – Stage 3 Worked Example– Stakeholder Engagement Dissemination Event Name Forooz Ghassemi (National Grid) Company Energy Networks Association – Code Administrator – Distribution Code of Great Britain Date 1st April 2019

  2. Content • A fictitious test network • One connection • Harmonic limits • Two concurrent connections at the same node • Two concurrent connection at different nodes • Harmonic limits for second connection Distribution Code Public Consultation – DCRP/19/03/PC – Engineering Recommendation (EREC) G5 Issue 5 (2019) – Stakeholder Engagement Dissemination Event

  3. Test network • A five bus network • A 800 MW connection at Node X is assessed • Transfer coefficients from Node X to other nodes are calculated from the harmonic model • Different scenarios, winter peak, summer mean, outages are considered • Transfer coefficients are the highest in all study cases • Background harmonic levels are obtained by measurement • Assume =1.4 for the harmonic order under study and the Planning Level is 2% Distribution Code Public Consultation – DCRP/19/03/PC – Engineering Recommendation (EREC) G5 Issue 5 (2019) – Stakeholder Engagement Dissemination Event

  4. First connection-calculate the headrooms The harmonic headroom at the PCC (Node X): =1.79 For Node Y, the headroom is calculated and transferred to Node X: =0.71 The same is applied for other nodes Distribution Code Public Consultation – DCRP/19/03/PC – Engineering Recommendation (EREC) G5 Issue 5 (2019) – Stakeholder Engagement Dissemination Event

  5. Calculate the apportionment factor • For an 800 MW connection at 400 kV: • =2000 • and k=0.4 • From apportionment curve; M=0.532 Distribution Code Public Consultation – DCRP/19/03/PC – Engineering Recommendation (EREC) G5 Issue 5 (2019) – Stakeholder Engagement Dissemination Event

  6. Limits for the first connection =0.95% = 0.41 is the lowest, thus the limiting node for the incremental limit is Node B Distribution Code Public Consultation – DCRP/19/03/PC – Engineering Recommendation (EREC) G5 Issue 5 (2019) – Stakeholder Engagement Dissemination Event

  7. Two concurrent connection at the same PCC • Assume, following the signing of the first connectee of 800 MVA, the second connection of 2000 MVA applies to connect to Node X • For the second connection at Node X • From the apportionment curve; M=0.66 Distribution Code Public Consultation – DCRP/19/03/PC – Engineering Recommendation (EREC) G5 Issue 5 (2019) – Stakeholder Engagement Dissemination Event

  8. Modification of headroom by the first connection • Headrooms are modified by the impact of first connection • Since the first connection is not yet connected, measurement does not show the impact • The background shall be determined by calculation • It is assumed the harmonic levels rise by the limits of the first connection • The background at Node X rises to the total limit: • The harmonic headrooms of the other nodes transferred to Node X are modified by the incremental harmonic limit of the first connection • E.g. for example for Node B, the modified transferred headroom is: • Node B is still the limiting node Distribution Code Public Consultation – DCRP/19/03/PC – Engineering Recommendation (EREC) G5 Issue 5 (2019) – Stakeholder Engagement Dissemination Event

  9. Notes of transfer coefficients • Connection of the first User plant does not change the transfer coefficients from Node X to other nodes • therefore no further re-calculation of the transfer coefficients is necessary, i.e. the original transfer coefficients are still valid • However, the connection of the first User plant does impact the transfer coefficients from other nodes to Node X Distribution Code Public Consultation – DCRP/19/03/PC – Engineering Recommendation (EREC) G5 Issue 5 (2019) – Stakeholder Engagement Dissemination Event

  10. Limits for the second User at Node X • 21=0.80% • = • The headrooms are apportioned and the incremental and total limits are calculated Distribution Code Public Consultation – DCRP/19/03/PC – Engineering Recommendation (EREC) G5 Issue 5 (2019) – Stakeholder Engagement Dissemination Event

  11. Two connection at different nodes Consider the second connection at Node Y instead of Node X The harmonic transfer coefficients from Node X to other nodes are the same as before The harmonic transfer coefficients from Node Y to other nodes, including Node X should also be obtained from the harmonic model Distribution Code Public Consultation – DCRP/19/03/PC – Engineering Recommendation (EREC) G5 Issue 5 (2019) – Stakeholder Engagement Dissemination Event

  12. Impact of the first connection on background The background harmonic levels at all nodes are impacted by the first connection Therefore, harmonic headroom at all nodes are modified by the first connection the background at Node X (first PCC) would be the total limit, i.e. after connection the levels rise to the total limit for the first connection The remote nodes background increase by the incremental limit for the first connection through the transfer coefficient from Node X to others Distribution Code Public Consultation – DCRP/19/03/PC – Engineering Recommendation (EREC) G5 Issue 5 (2019) – Stakeholder Engagement Dissemination Event

  13. Modification of background of Nodes X and Y • Node X new background =1.21% • For Node Y the background harmonic level increases using the incremental limit for the first connection through the transfer coefficient from X and Y Distribution Code Public Consultation – DCRP/19/03/PC – Engineering Recommendation (EREC) G5 Issue 5 (2019) – Stakeholder Engagement Dissemination Event

  14. Other nodes new backgrounds • =1.55% • =1.55% • =0.48% Distribution Code Public Consultation – DCRP/19/03/PC – Engineering Recommendation (EREC) G5 Issue 5 (2019) – Stakeholder Engagement Dissemination Event

  15. Harmonic headrooms Harmonic headroom at Node Y =1.22% Harmonic headroom at other nodes =0.77% =0.28%=0.60%=1.64% Distribution Code Public Consultation – DCRP/19/03/PC – Engineering Recommendation (EREC) G5 Issue 5 (2019) – Stakeholder Engagement Dissemination Event

  16. Limit for the second connection at Node Y • 22=0.81% • =74% The limiting remote node is Node A The multiplier M is 0.66 (for k=1, M=0.66). Distribution Code Public Consultation – DCRP/19/03/PC – Engineering Recommendation (EREC) G5 Issue 5 (2019) – Stakeholder Engagement Dissemination Event

  17. Harmonic limit table Distribution Code Public Consultation – DCRP/19/03/PC – Engineering Recommendation (EREC) G5 Issue 5 (2019) – Stakeholder Engagement Dissemination Event

  18. Distribution Code Public Consultation – DCRP/19/03/PC – Engineering Recommendation (EREC) G5 Issue 5 (2019) – Background Name Forooz Ghassemi/Simon Scarbro Company National Grid/Western Power Distribution Date 1st April 2019

  19. Closing • Second Stakeholder Engagement – Glasgow 10th April 09:30-16:00 • Consultation Next Steps • A comprehensive consultation pack with further details can be downloaded from the Distribution Code Website using the following link- http://www.dcode.org.uk/consultations/open-consultations/ and opening consultation tab DCRP/19/03/PC. • Responses to this consultation should be sent to the Distribution Code Administrator at dcode@energynetworks.orgby 17:00 on 19 April 2019 on the pro-forma provided in the pack. Responses received after this date may not be considered. Distribution Code Public Consultation – DCRP/19/03/PC – Engineering Recommendation (EREC) G5 Issue 5 (2019) – Stakeholder Engagement Dissemination Event

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