CIRED 2011RT 5b

CIRED 2011RT 5b

TSO-DSO co-ordination of planning for wind connections

Tony HearneManager, Renewable Planning ESB Networks

Frankfurt (Germany), 6-9 June 2011

Topics

Utility Landscape in Ireland Wind situation in Ireland Group processing Gate 3 Conclusions


Topics



Main Players in Ireland

Regulator Transmission System Operator Transmission System Planner Distribution System Operator Distribution System Planner Transmission and Distribution Asset

owner

CER EirGrid EirGrid ESB Networks ESB Networks ESB


System Operator Structures

ESB Group

Generation- Customer supply

Consultancy

Eirgrid PLC

•TSO

•Plan Tx network

•Contol access to Tx network

•Operate Tx network

•SEMO

•Operate wholsale energy market

ESB Networks Ltd•TAO•DAO•DSO


Transmission Transmission 6,300 km of Overhead Network6,300 km of Overhead Network 140km of Underground Cables140km of Underground Cables 165 HV Stations165 HV Stations

€€1B RAB Value 1B RAB Value

DistributionDistribution 160,000 km of Lines/Cables160,000 km of Lines/Cables 630 HV Substations630 HV Substations 230,000 MV Transformers/Units230,000 MV Transformers/Units 2m meters2m meters

€€5B RAB Value 5B RAB Value

Transmission

400kV 220kV 110kV

38kV

MV 20 kV & 10 kV

Distribution

LV 400 & 230 V

110kV

220kV

400kV 20kV

10kV


Topics




Wind Connections MW

1460 MW c1250

3990

System Demand 2020


0

10

20

30

40

50

60

00

:00

01

:30

03

:00

04

:30

06

:00

07

:30

09

:00

10

:30

12

:00

13

:30

15

:00

16

:30

18

:00

19

:30

21

:00

22

:30

%

Time

Wind generation as % of system demandMonday 5th April 2010

%


History to date

Up to 2003 applications for connection of wind to both System Operators were processed sequentially

Since 2004, following a moratorium on wind connections, such is the volume of applications in the queue, that a Group Processing Approach [GPA] was the only practical way forward.

They are now processed in batches known as Gates

Gate Size [MW] YearTake up of

offers

1 370 2005 100%

2 1385 2007 100%

3 3900 2011 Offers issue nearing

completion


Connected: Blue

In Progress: Red

Being Quoted: Green


Topics



Example of Sequential Approach

110kV

38kV

MV

110/38kV Stn

38kV/MV Stn

38kV/MV Stn

38kV

38kV


110kV

38kV

MV

?

110/38kV Stn

38kV/MV Stn

38kV/MV Stn

38kV

38kV

Example of Sequential Approach


110kV

38kV

110/38kV Stn

38kV/MV Stn

38kV/MV Stn

110kV

38kV

Example of Group Approach


Sequential processing

Large applicants tend to apply to TSO, smaller ones to DSO

The connection method is determined solely on the basis of their connection

Applicants pay for their dedicated works

Interracting offers can cause withdrawal of offers already in train

Group Processing

Applications are processed by the SO most suited to their Group connection irrespective of which SO they originally applied to.

The connection method is determined by the Least Cost technically Acceptable [LCTA] method for the defined sub-group

Applicants pay in full for their dedicated shallow works and a per MW share of shared shallow works

No Interaction issues within Gates


General operation of a “Gate”

Regulator [with input from both System Operators and wind industry] determine criteria for eligibility for inclusion of “Gate”

TSO and DSO jointly apply criteria to the “Queue” of application

Queue comprises both DSO and TSO applicants

Result: Make up of “Gate” is determined


Topics



Implementation of Gate 3

The implementation of Gate 3 required very close collaboration between CER, TSO and DSO.

The following slides will endeavour to explain the steps, mechanisms and features involved

Network MWNumber of

Connections

Distribution 1941 127

Transmission 2050 28


Size of Gate 3

22


1: Eligibility criterion

Full consultation held with industry and stakeholders

Result: Date order of applications the clear preference from the wind industry

CER Direction issued to System Operators including MW size of the Gate

Implementation commences Unified “queue” formed by

combining separate SO queues Cut-off criterion applied

In

Out


What next?

Now we know who is in and out! To begin their studies, TSO need to know how much

generation will present at their transmission nodes In order to inform this, DSO would normally carry out full

studies on the smaller applicants to determine which transmission node

To shorten timeframe as much as possible it was necessary to frontload the node assignments


2: Node Assignments

Banded rule-set devised based upon distance to nearest distribution primary sub-station

Clauses put in place to define “nearest”

Result: Transmission sub-groups formed

Application Capacity

Node Rule

Less than 5 MW Nearest 38 kV

5 MW – 10 MW Nearest 38 kV or 110 kV

10 MW – 40 MW Nearest 110 kV

40 MW – 177 MW New 110 kV

Greater than 177 MW

New 220 kV or 400 kV

Tx Node 1

Tx Node 2


DSO and TSO

DSO

TSO

Gate 3 General TSO-DSO Process

Node Assignment

Establish Tx Firm Access Quantities

Determine Distribution connection methods

Report to TSO

Tx SC and other studies

Connection Agreement

Issue DSO offers

Issue Tx offers


◦ Transmission System Operator calculates additional capacity available at each node for each future year.

◦ Available capacity allocated based on application date-order

◦ Each Gate 3 application will have a Scheduled Firm Access Quantity for each year from 2010 to 2025, taking account of grid reinforcements and other new generation

◦ Thus, transmission reinforcement based on approved development strategy leads the wind generation connections.

Transmission Firm access quantities


Takes account of: demand growth renewable generation to meet targets conventional generation development future DC interconnections with UK or Europe.

Will require ~ 1,150 km new transmission ~ 2,300 km upgrades

Grid development strategy to 2025

http://www.eirgridprojects.com/


Project Planning

Country divided in to ”Areas” for transmission study purposes

Detailed offer issuance Project Plan agreed between TSO, DSO and CER.

Project Plan published


Communications Gate 3 Liaison Group meeting

chaired by Regulator Attended by both SO ‘s and representatives of all industry

stakeholders SO’s report on progress per workplan Other issues discussed as they emerge

Customer connection meetings Held once distribution connection methods signed off

TSO-DSO bi-lateral meetings Held bi-monthly or weekly

Questions ?

[email protected]


Conclusions

The circumstances in Ireland lend themselves to the TSO-DSO-Regulator approach outlined above

Facilitates large quantities of Renewable Energy being processed in a structured manner

Transmission and Distribution systems developed in co-ordinated fashion

Certainty of offer issuance to those in the Gate

Rationalises the allocation of scarce capacity

Documents

CIRED 2011RT 5b