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. SINTEF Energy Research 1
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 2
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 SINTEF Energy Research
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 5
Main activity 1: Power system security assessment � Starting point (vision): � Develop methods and tools for transmission limit determination based on probabilistic criteria Total cost Constraint cost Costs (C) Expected interruption cost ∆ Cost Market demand (N-1) limit, F u F N-1 Interface Flow (F) SINTEF Energy Research 6
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 SINTEF Energy Research 7
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 operation (re-dispatch), in operation planning, and in daily price-setting in the Elspot market. SINTEF Energy Research 8
Software modules Congestion cost Congestion cost Risk index Risk index due to different due to different calculation calculation Elspot area prices Elspot area prices Assembly of results Assembly of results Assembly of results Decision aid Decision aid Decision aid Congestion cost Congestion cost due to re-dispatch due to re-dispatch Expected interruption Expected interruption (Balancing Power (Balancing Power cost estimation cost estimation Market costs) Market costs) SINTEF Energy Research 9
Control center implementation Weather NordPool SCADA/EMS forecast p 2 SA / SCD p 1 F Congestion Security cost index F F C f (F) N-1 Risk(F) Operator Optimization and decision F SINTEF Energy Research 10
Congestion cost and contingency analysis - HASLE 80000 0.8 60000 0.6 Congestion cost [NOK/hour] Riskindex 40000 0.4 20000 0.2 0 0 800 1200 1600 2000 2400 2800 PTC flow [MW] SINTEF Energy Research 11
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 Security criteria Generation & Consumption Congestion cost Expected interruption Deficit Operating costs network area strategy System protection SINTEF Energy Research 12
Network areas of interest 132 kV 300 kV 420 kV Indre Sogn SVELGEN GYLTHALSEN GROV STAKALDEFOSS KR.SUND HØYANGER JOSTEDAL TROLLHEIM FARDAL ORKDAL Bergen HOVE DALE LEIR- FORTUN ISTAD DØLA VERDAL REFSDAL BRANDHOL KOLLSNES AURLAND DRIVA MODAL GRYTTEN AURA FANA EVANGER KLÆBU GRANA STRINDA SIMA STORD GISKEMO HUSNES SAMNANGER BRATTSET ØRSKOG HÅVIK NEA MAURANGER TAFJORD SYKKYLVEN HAUGEN DAGALI HÅHEIM BLÅFALLI LITJFOSSEN OKSLA LEIVDAL ÅSKÅRA SAUDA ÅSEN BRYGGJA ULSET RØLDAL NESFLATEN Sunnhordland VÅGÅMO SAVALEN SONGA VEMORK HYLEN RJUKAN Ø.VINSTRA KVILDAL RENDALEN SAURDAL VINJE HOLEN TOKKE SINTEF Energy Research 13
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 SINTEF Energy Research 14
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. SINTEF Energy Research 15
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 oscillation damping in large power system, including design of stabilising controllers. � Contributions have been made to the design and tuning of new power system stabilisers. SINTEF Energy Research 16
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