Project: Increased Utilisation of the Nordic Power Transmission System

Transkript

1 Workshop: Project: Increased Utilisation of the Nordic Power Transmission System The main aim of the workshop is to establish a meeting place for all project participants to present preliminary results from the individual projects get information on other relevant activities discuss further work. 1

2 Outline.. Background and motivation for the project Overview and organisation of the project Main project plan and activities Security assessment / Congestion management Models and simulation tools for TSOs System-oriented control and monitoring Related activities Agenda for the workshop 2

3 Background Important background is the work carried out in the project Driftssikkerhetsplanlegging og kontroll ( ). Common problems and challenges within the Nordic power system (one grid / one market). Closer cooperation among the Nordic system operators (TSOs / ISOs) through Nordel Nordic R&D cooperation was encouraged 3

4 Increased utilisation of the Nordic power transmission systems Co-operation between: Nordic TSOs Universities and Research institutions Norges Forskningsråd Work form (approach): R&D projects Prototype development PhD-studies

5 Increased utilisation of the Nordic power transmission systems Main activities: 1. Security assessment / congestion management 2. Models and simulation tools for TSOs 3. System-oriented control and monitoring

6 Utilisation of transmission system capacity (motivation and challenges) Increasing consumption Increasing exchange of power Power System Main focus on economy and markets Lower rate of investments -Increasing strain on transmission systems -Shortage of reserves and power capacity -Larger / more frequent changes in generation R&D Components / Control systems R&D Power system security and operation R&D Power markets and tariffs 6

7 Key questions and challenges: How to determine operating limits? Security criteria / operation planning How to enforce the limits? Congestion management / through Elspot / counter trade What happens when the limits are exceeded? Security assessment / Consequences / Expected interruption costs (Then in operation) What are the real limits? Thermal and voltage limits / voltage and angle stability What can be done to increase the limits? Better tools for assessments and system monitoring Stability improvements: Retuning / redesign of stabilisers System protection schemes 7

8 1. Security assessment / congestion management Proposed sub-projects: Prototype model: Flexible transfer limits Implement on-line tool for determination of flexible transfer limits (Statnett) Proposed R&D-project: Security assessment (common Nordic project) Proposed PhD-study: Consequences of transmission system failures 8

9 Interface Flow Limit determination Probabilistic criterion Total cost Constraint cost Costs (C) Cost Expected interruption cost (N-1) limit, F N-1 Market demand F u Interface Flow (F) 9

10 Main tasks during bidding and operation SYSTEM OPERATOR Preliminary load flow Price area exchange limits Load forecast FlexLast Overview of production and available capacity Sum gen. schedules Regulating Power Market Deviations / Congestion Regulating Power Market MARKET OPERATOR Market information Market clearing MARKET PLAYERS Pre-scheduling - obligations - generation 08:00 Spot Market bidding 12:00 15:00 en. schedules Bids Regulating Power 19:00 Secondary Control 00:00 24:00 SPOT PHASE PRE-OPERATIN PHASE OPERATION PHASE 10

11 2. Models and simulation tools for TSOs Proposed sub-projects: System models for market and network operation Market interfaces and network models for EMS applications Modelling tool with focus on system operation and security related problems (secondary control, congestion management, system protection, etc.). Area price determination based on network equivalents Implementation of a Nordic power system model based on area equivalents. Development of a prototype market simulator PhD-study TSO simulator 11

12 Simulation tool for system operation Market model - Dispatch (distribution of loads and generation) Scenario definitions Load change Outages P gen P load SIMULATOR - Load flow (AC and DC) - Dynamic simulation Prices (elspot and balancing markets) Post processing -Interface (OPF, PacDyn) - enerating equvivalents Topology Protection Limits Actions System operator 12

13 Market model NO2 SE FI NO1 DK 1 DK 2 13

14 Network model 14

15 Network equivalents, bids and cost functions P p 0 p 0 P 0 P 15

16 3. System-oriented control and monitoring Proposed sub-projects: Three sub-projects with main activities: Model development and validation Power system stability assessment New power system control and monitoring applications System operation (and system protection) with increasing wind power and distributed generation PhD-studies: Powerdamp System protection 16

17 Main areas of work Stability control and dynamic security assessment: Determination of stability limits Small signal stability assessment Coordinated design of PSSs Coordinated voltage control FACTS and HVDC Online DSA WAMS, State estimation, online stability analysis System protection and reserves Focus on new solutions to cope with large scale integration of wind power and distributed generation 17

18 Power transfer limits on transmission corridors Interface flow Thermal limit Angle stability limit Secure operation Voltage stability limit Loading criteria Overall objective: To raise the stability constrained limits towards (or beyond ) the thermal limit 18

19 P-V curves Results from dynamic simulations 1.1 Voltage, Hasle [p.u. on 400 kv base] Base Case operating point Contingency Case Base Case P owe r tra ns fe r, Ha s le [MW] 19

20 Assessing stability limits P = +400 M W P = +200 M W P = 0 M W P = -200 M W P = -400 M W P = -600 M W P = -800 M W P = M W

21 Related projects with focus on wide area control and use of synchronised phasor measurements PMU Sima Kvilldal PMU Rød Halden PMU VIP 21

22 Workshop: program and time table Day 1 Wednesday 30. October > Coffee, tea and refreshments : Welcome and introduction (Kjetil Uhlen, Sintef) : Security assessment / Congestion management Flexible transfer limits Flexlast (D.E. Nordgård, Sintef) : Models and simulation tools for TSOs Area price determination with network equivalents (O.S. rande, Sintef) 19.00: Dinner: Credo Ørjaveita 4, 7010 Trondheim

23 Workshop: program and time table Day 2 Thursday 31. October : System-oriented control and monitoring Determination of stability limits (Magni Palsson, Sintef) Stability analysis and stabiliser design (S. Elenius, HUT) System protection (J. Rasmussen, DTU/Elkraft System) : Lunch 12: : Wide area monitoring and control (Related activities) WAMS and PMU-projects (O. Samuelsson, Lund) PMU developments (K.O.H. Pedersen, DTU) NIP - project (Statnett PMU and VIP installations)(ø.kirkeluten, Statnett) : Discussion (Ideas and priorities for further work) (All) Introduction by Research Director Petter Støa, Sintef 23