3rd Workshop: Increased Utilisation of the Nordic Power - - PowerPoint PPT Presentation

1 SINTEF Energy Research

3rd Workshop:

”Increased Utilisation of the Nordic Power Transmission System”

Time and place: Rica Hotel Gardermoen, Gardermoen

Start: Wednesday, 26. October 2005 at 13.00 (Lunch from 11.30) End: Thursday, 27. October at 13.00 (Lunch from 13.00)

The main aim of the workshop is

to establish a meeting place for all project participants to present results from the individual projects to discuss overall results and experiences from the project. to discuss views on future R&D collaboration

Participation: Project participants from universities and Sintef, key persons from the Nordic system operators and invited experts.

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Workshop program

Day 1 – Wednesday 26. October

11:30 Lunch at the hotel 13:00 Welcome and project summary (by Kjetil Uhlen, Sintef) 13:30 Power system security assessment

Introduction (Prof. Arne T. Holen, NTNU) Implementing a probabilistic approach in operation – Models, practical examples

and experiences (I. Gimmestad, Statnett)

A Method for the Probabilistic Security Analysis of Transmission Grids (L.

Pottonen, Fingrid)

15:00 Coffee break 15:15 Power system stability monitoring and control

Short introduction (Kjetil) Phasor measurements - status and applications (Olof Samuelsson, LTH) Phasor measurements at Statnett – Status report (Jan Ove Gjerde)

16:30 Power system operation and control – R&D challenges in the future

Introductory presentations (TSO views by Holmberg, Vormedal, Jyrinsalo,

Havsager)

Discussion (All)

19:30 Dinner at the hotel

SINTEF Energy Research

Increased utilisation of the Nordic power transmission systems

Co-operation between: Nordic TSOs: Elkraft System, Fingrid, Statnett, SvK Nordic universities: DTU, HUT, NTNU SINTEF Energy Research Duration: 2001-2006 Budget/Costs: NOK 15 mill. / NOK 13.5 mill 50% by Research Council of Norway / 50% by TSOs

SINTEF Energy Research

Increased utilisation of the Nordic power transmission systems

Objectives:

To carry out research and development in the area of power system security and power system operation and control. To develop new models, tools and strategies for power transmission system operation and new methods for power system security assessment and control design. .. to contribute to increased transmission system utilisation and efficiency of operation without sacrificing power system security.

Main activities:

• 1. Power system security assessment
• 2. Models and simulation tools for TSOs
• 3. System-oriented control and monitoring

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Workshop program

Day 1 – Wednesday 26. October

11:30 Lunch at the hotel 13:00 Welcome and project summary (by Kjetil Uhlen, Sintef) 13:30 Power system security assessment

Introduction (Prof. Arne T. Holen, NTNU) Implementing a probabilistic approach in operation – Models, practical examples

and experiences (I. Gimmestad, Statnett)

A Method for the Probabilistic Security Analysis of Transmission Grids (L.

Pottonen, Fingrid)

15:00 Coffee break 15:15 Power system stability monitoring and control

Short introduction (Kjetil) Phasor measurements - status and applications (Olof Samuelsson, LTH) Phasor measurements at Statnett – Status report (Jan Ove Gjerde)

16:30 Power system operation and control – R&D challenges in the future

Introductory presentations (TSO views by Holmberg, Vormedal, Jyrinsalo,

Havsager)

Discussion (All)

19:30 Dinner at the hotel

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Main activity 1: Power system security assessment

Starting point (vision):

Develop methods and tools for transmission limit determination

based on probabilistic criteria

Interface Flow (F) Costs (C)

Total cost Constraint cost Expected interruption cost

Market demand Fu (N-1) limit, FN-1 ∆Cost

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• 1. Power system security assessment

Sub-projects: Prototype model: Flexible transfer limits

Implement on-line tools for determination of flexible transfer

limits (Statnett)

The project is followed up with the development of a practical

decision support tool for congestion management

PhD-study at NTNU:

Subject: “Consequences of transmission system failures” Status: Giuseppe Di Marzio has good progress

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On-line tool “FlexLast” Flexible transfer limits

Prototype tools, computing:

Congestion costs based on available market and system

information from Nord Pool.

Risk indices based on contingency analyses and statistical

data.

Expected interruption costs

Purpose: Practical testing and demonstration of the proposed concept. Proposed applications: Decision support tool in

• peration (re-dispatch), in operation planning, and in

daily price-setting in the Elspot market.

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Software modules

Congestion cost due to different Elspot area prices Congestion cost due to re-dispatch (Balancing Power Market costs) Risk index calculation Expected interruption cost estimation Assembly of results

Decision aid

Congestion cost due to different Elspot area prices Congestion cost due to re-dispatch (Balancing Power Market costs) Risk index calculation Expected interruption cost estimation Assembly of results

Decision aid

Assembly of results

Decision aid

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Control center implementation

Optimization and decision

SCADA/EMS

SA / SCD Weather forecast

F

p2 p1

F

Congestion cost

F

Operator NordPool

F

Security index

Cf(F) Risk(F) N-1

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800 1200 1600 2000 2400 2800 PTC flow [MW] 20000 40000 60000 80000 Congestion cost [NOK/hour] 0.2 0.4 0.6 0.8 Riskindex

Congestion cost and contingency analysis - HASLE

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Main result: Model for decision-making

Decision on operating startegy involves: Transfer limit (Amount of corrective re-dispatch) If and where to split the network

Generation & Consumption Congestion cost Expected interruption costs Deficit network area System protection Operating strategy Security criteria

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Network areas of interest

HOVE SIMA AURLAND FARDAL REFSDAL MODAL EVANGER SAMNANGER MAURANGER BLÅFALLI SAUDA HÅVIK STORD HYLEN KVILDAL NESFLATEN

SAURDAL

RJUKAN HOLEN SONGAVEMORK TOKKE DAGALI

LEIR- DØLA JOSTEDAL FORTUN

DALE FANA KOLLSNES HUSNES

SVELGEN STAKALDEFOSS HØYANGER GROV VINJE RØLDAL ÅSEN OKSLA

KLÆBU

VERDAL STRINDA

Ø.VINSTRA

NEA

ORKDAL AURA VÅGÅMO

TROLLHEIM

132 kV 300 kV 420 kV

Sunnhordland Bergen Indre Sogn

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Power system stability, monitoring and control

Background and motivation

Security can be improved if operators can detect and react to contingencies and

alert situations faster than today

New monitoring devices are available (e.g. PMUs and the VIP) Faster communication systems The industry need ”help” to develop system solutions (algorithms and prototypes) There is a need to develop and test applications

Problem areas to study:

What applications are needed? What are the main system problems (to monitor and control)? Local vs. centralised control? Automatic vs. manual control? How to / what to monitor? Where and how to control?

Challenges:

To develop algorithms and prototypes related to

Stability monitoring contingency monitoring System protection

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Main achievements (results and contributions)

• 1. Power system security assessment

Development of new methods for probabilistic security assessment, including a new model for decision support to be used during operation or operation planning.

Prototype model to be used in congestion management to select operating strategy

for optimal utilisation of transmission corridors feeding deficit generation areas.

• 2. Models and simulation tools for TSOs

Method for realistic representation of on-line generation in power system simulators.

The method is based on an algorithm that starts or stops generators in order to

provide a realistic amount of on-line reserves and frequency bias.

Development of a new method and a demonstration model for congestion management in conjunction with day-ahead electricity markets.

The method for area price determination uses a simplified power flow

representation, similar to the flow-based market coupling presented by ETSO and EuroPEX.

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Main achievements (results and contributions)

• 3. System-oriented control and monitoring

Contribution to the development of wind farm models and utility programs for representation of wind generation in power system simulators.

Methods and analysis to gain competence regarding transient stability and

voltage collapse problems.

Specific results are PSS/E user models to represent wind farms (turbine

and generator models)

Application of new methods for analysing stability and power

• scillation damping in large power system, including design of

stabilising controllers.

Contributions have been made to the design and tuning of new power

system stabilisers.

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Topics for future R&D projects

Wide area monitoring and control Research topics:

Configuration and design of wide area monitoring systems based on the use of

phasor measurement units.

Development of specific monitoring, control and system protection applications

enabled by phasor measurements.

Potential benefits:

Improved information about system stability properties Basis for better coordination of operator actions Improved preparedness for emergencies and potentially increased utilisation of the

system.

Probabilistic security assessment Research topics:

Further development of probabilistic methods for risk assessments. The use of probabilistic methods for determination of transmission limits and

• perating strategies.

Potential benefits:

To share and increase knowledge concerning available methods and applications To enable flexibility in system operation practices to effectively deal with frequent

bottlenecks as well as the more occasional critical situations.

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Topics for future R&D projects

On-line security assessment Research topics:

To develop and tailor new EMS applications to the needs of system operators. Dynamic security assessment.

Potential benefits:

Improved utilisation of state estimators and EMS system. To share knowledge and experiences concerning the development and utilisation of

EMS systems.

Secondary control and reserves Research topics:

Develop tools and methods for monitoring, management and co-ordination of

reserves

Study of market based AGC for secondary control.

Potential benefits:

Improve management and monitoring of reserves in a power system with more

frequent changes due to increasing amount of wind power generation and increasing power exchange due to closer integration of power markets and more HVDC links.

Reduce overall costs due to provision of reserves.

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Sub-project 2001 2002 2003 2004 2005 2006

• 1. Security assessment

1.1 Flexible transfer limits, ”Flexlast” (Statnett avtivity)

• 1.2 Decision support tool

for congestion man. (Statnett avtivity)

• 1.3 PhD study
• ---- -----------
• 2. Models and Simulation tools for TSOs

2.1 System models for market/network oper. (SvK activity)

• 2.2 Area price determin.

based on network eq. (Nordel activity)

• 3. System-oriented control and monitoring

3.1 System stability – (Statnett activity)

• 3.2 System stability –

(Fingrid activity)

• 3.3 System operation –

(Elkraft System)

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Workshop program

Day 2 – Thursday 27. October

09:00 Models and simulation tools for TSOs

Introduction (Kjetil) Flow-based market coupling - Status and model developments (K. Uhlen / L. Warland,

Sintef)

Step-wise power flow - A model for analysing balancing control and capacity problems

(B.H. Bakken, Sintef)

Network models for EMS - Summary of SvK-project (Tobias Larsson / L. Warland)

10:45 Coffee break 11:00 Power system stability – modelling and control

Introduction and overview of project activities (Kjetil) Stability assessments at Fingrid (Harri Kuisti, Fingrid)

• Efforts to improve power system damping
• Power oscillation monitoring system

Wind farm system requirements (Giuseppe Di Marzio, NTNU) Wind farm modelling for power system studies (Magni Þ. Palsson, Sintef)

• Wind power integration - case studies for Elkraft System and Statnett)

13:00 Lunch at the hotel

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Main activity 2: Models and simulation tools for TSOs

Starting point (vision): Vision about and integrated computer analysis and simulation tools tailored for TSO needs

Market model

• Dispatch

(distribution of loads and generation) SIMULATOR

• Load flow (AC and DC)
• Dynamic simulation

Prices (elspot and balancing markets) Pload Pgen Post processing

• Interface (OPF,

PacDyn)

• Generating

equvivalents Scenario definitions Load change Outages System operator Topology Protection Actions Limits Market model

• Dispatch

(distribution of loads and generation) SIMULATOR

• Load flow (AC and DC)
• Dynamic simulation

Prices (elspot and balancing markets) Pload Pgen Post processing

• Interface (OPF,

PacDyn)

• Generating

equvivalents Scenario definitions Load change Outages System operator Topology Protection Actions Limits

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Main activity 2: Models and simulation tools for TSOs

Results: Several computer models:

Market model Model for secondary

control assessments

Specific network

models and tools Market model

Area price determination based on network equivalents

Network models and tools Stepwise Power Flow

Secondary control /reserves

User models for PSS/E

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Main activity 3:

Power system stability – modelling and control

Starting point (vision): Intelligent networks

Agent technology Wide area monitoring Local intelligence Distributed control

Elimination of stability constraints

Loading criteria Interface flow Thermal limit Angle stability limit Voltage stability limit Secure

• peration

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Main activity 3:

Power system stability – modelling and control

Results: Application oriented research

Stability assessments Stabiliser design Wind farm dynamic models Case studies

Practical results!

Common problems Most successful activities!

60 70 80 90 100 110 2 3 4 5 6 7 8 9 10

Linear analysis Damping (%) Flow Northern-Finland - Sweden (% of base case)

0.34 Hz, SVCs connected 0.34 Hz, SVCs disconnected 0.57 Hz, SVCs disconnected 0.57 Hz, SVC connected