the feasibility of synchronous interconnection

union for the co-ordination of transmission of electricity

The Feasibility of Synchronous Interconnection between IPS/UPS and UCTEMatthias Luther

Regional Electricity System and Market towards the Internal Electricity Market (RESYM)

Bucharest, 26 October 2007Supported by:

The Feasibility of Synchronous Interconnection between IPS/UPS and UCTE

page 2 Matthias Luther; 26 October 2007

UCTE-IPS/UPS Study – three major questions to answer

Is a synchronous coupling of IPS/UPS with UCTE feasible?

What are the mandatory measures and requirements on both sides?

What are the associated costs?

Considering technical, organisational and legal issues the study has to answer the following questions:

Additionally, market aspects and environmental issues are building the conditional framework.

First priority: maintaining the present performance of the systems with respect to system security and reliability.



Facts and framework of the project

The three years investigation is a joint project under the responsibility of UCTE

The project focus on a synchronous coupling of IPS/UPS and UCTE

Additionally, the consideration of non-synchronous link projects is foreseen

Budget: approximately 10 million €

Nearly 100 experts from both sides involved

No example in the world of a synchronous transmission system

- with 900 GW installed generation capacity

- serving 700 million customers

- in 10 time zones



Mandatoryinterconnection

rules

System integration vs. System coupling

System Arules

System Brules

System Arules System B

UCTErules

IPS/UPSrules

Integration

Allocation of corresponding and further mandatory

• technical• organisational • legal

measures and rules on both sides.

System coupling:UCTErules

IPS/UPSrules

Coupling



UCTE-IPS/UPS study – common project organisation

PM / PM UCTE PM IPS/UPS

Project Representative Board (PRB)

Project Management Board (PMB)

Technical Aspects

WG 1:Steady StateAnalysis

WG 2:System Dynamics

WG 3:Power System Control

WG 4:Operation and Organization

WG 5:Legal Aspects



Initial time schedule and project phases

pre-phase

phase 2Verification

and Simulation

phase 1Model

Preparation

April 20

08

Final Rep

ort

• verification ofmodels

• power system simulations

• sensitivity analyses

• ToR• TEN-E

Application• Set up of

consortia• Cooperation

Agreement

• Project kick-off• survey of IPS/UPS

system• installation of

measurement devices

• power system measurements

• data collection• preparation of

models

• further analyses • evaluation ofresults

• identification of measures and theircosts

• presentation of results

• preparation of draftof final report

phase 3Assessmentand Results

finalphase

• final report • final accounting• end of project

2005 2006 2007

Conceptual

Report

2004 April 20

05

2008

“go” for

simulat

ions



Summary of Analysis ProgramSteady State Analysis

Load flow simulation of nominal and emergency conditions Estimation of interface transmission capacityIdentification of most probable load flow scenarios

System DynamicsTransient and small signal stability analysisImpact of IPS/UPS Emergency Control Automatics

Power System ControlPower / frequency controlVoltage / reactive power controlAnalysis of defense, disconnection and restoration plans

Operation and OrganizationAnalysis of operational practiceGuidelines for interface proceduresCoordination of operation (i. e. data exchange, congestion management, etc.)

Legal AspectsAnalysis of legal frameworksLegal case studiesIdentification of legal requirements for synchronous operation



Merged UCTE-IPS/UPS load flow study model

Load flow model includes representation for the planning horizon 2008 of

HV and UHV network (220 kV and above)

Important transmission lines of lower voltages (inter-system transmission lines, generator lines of large power stations)

Significant power stations in the interface area

Volume of load flow model

3,910 nodes

9,730 ties (lines and transformers)

770 generator nodes

Total load (winter peak load 10 GMT): 530 GW



Fran

ce

Transfer scenarios for load flow analysis



1 Cartelle2 Montearenas3 Aldeadavila4 San Sebastian de las Reyes5 Hernani6 Arkale7 Biescas8 Vic9 Rubi10 Benejama11 Puerto de la Cruz12 Cedillo13 Saucelle14 Albertville15 Tavel16 Saucats17 Tabarderie18 Lonny19 Uchtelfangen20 Hagenwerder21 Röhrsdorf22 Krajnik23 Wielopole24 Rogowiec25 Polaniec26 Györ27 Göd28 Sajoszöged29 Heviz30 Paks

31 Portile de Fier

32 Tantareni33 Blagoevgrad34 Ag.Stefanos35 Bassecourt36 Mettlen37 Lavorgo38 Soazza39 Rondissone40 Redipuglia41 Aurelia42 Brindisi43 Sorgente44 Avelgem

measuring devices:installedplanned

Wide Area Measuring System (WAMS)in UCTE

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45 Oujda46 Ghazaouet47 Tlemcen48 Oued Sly49 Jijel50 Biskra51 El Aouinet52 Tajerouine53 Tataouine



Thu, 2006-02-09; 11:26:47 - Generation Outage: NUEVA ESCOMBRERAS (ES) dPa=-1200 MW

49,930

49,940

49,950

49,960

49,970

49,980

49,990

50,000

50,010

50,020

50,030

11:26:35 11:26:40 11:26:45 11:26:50 11:26:55 11:27:00 11:27:05 11:27:10 11:27:15 11:27:20

f [Hz]

Portile de Fier (RO)

SS Reyes (ES)

Uchtelfangen (D) Röhrsdorf (D)

49,93

49,95

49,97

49,99

50,01

50,03

0,00 2,00 4,00 6,00 8,00 10,00 12,00 14,00 16,00 18,00 20,00 22,00 24,00 26,00 28,00 30,00

Time [s]

freq

uenc

y [H

z]

ES/PORGERPortile de FierRöhrsdorf

Verification of UCTE dynamic study model:Outage of 1200 MW generation capacity in Spain (9 February 2006)

recordings simulations with study model



Preliminary findings

the necessity of the transmission network re-enforcements mainly dedicated to the IPS/UPS interface area,

a higher potential risk for the dynamic stability of the interconnected systems compared to the current performance of both systems,

the adaptation and harmonisation of today’s existing defence and restoration plans in both synchronous areas

the need for interzonal, bilateral and multilateral agreements in order to setup a legal basis for a future reliable market platform with the focus on necessary organisational and operational issues under the framework of EU-market requirements and standards

The preliminary results underline that - even if a synchronous coupling mode of operation may appear viable under the implementation of certain pre-conditions - it can only be understood as a long term option for creating a joint electricity market platform.



Outlook: expected results in 2008An evaluation of the feasibility considering technical, operational, organisational and legal aspects based on available resultsAn allocation of necessary measures and their associated costs to be made on both sides of the interface.An open outlook on non-synchronous system coupling possibilities aiming at an economic comparison for the investigated system coupling and an indication for the time horizon for a possible implementation for both variants.The final study results may form a basis for further steps undersupervision of the European Commission and other stakeholders.Nevertheless, any decision need to be made by stakeholders taking into account the two further fundamental pillars

- reciprocity in market conditions - compatibility of environmental standards including

nuclear safety



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