Alves, F.R.M. Henriques, R.M. Passos Fº, J.A. Gomes Jr., S. Borges, C.L.T. CEPEL UFJF UFJF CEPEL UFRJ

Transcription

1 1 Integrating Solution Engines Under a Distributed Processing Environment: An Alternative Approach for Static and Dynamic Security Assessment of Large Scale Power Systems Alves, F.R.M. Henriques, R.M. Passos Fº, J.A. Gomes Jr., S. Borges, C.L.T. CEPEL UFJF UFJF CEPEL UFRJ Falcão, D.M. Aveleda, A. Taranto, G.N. Assis, T.M.L. UFRJ UFRJ UFRJ UFRJ

2 2 Introduction Power Systems s Growth Utilities Deverticalization Power system operation close to physical and operational limits Growing Complexity Interconnections

3 3 Introduction Brazilian Interconnected Power System - BIPS Sto Antônio / Jirau São Luiz do Tapajós Belo Monte Teles Pires

4 4 Introduction Hydrological Complementarity Renewable Energy Sources Wind Bagasse Photovoltaic... Distributed Generation Natural Gas... Increasing Load Multiple Generation Scenarios Need for reliable power system analysis tools to ensure secure operation of the Brazilian Interconnected Power System

5 Structureofa SDSA Tool 5 EMS DATABASE DATA NETWORK TOPOLOGY PROCESSOR Online SDSA SCADA STATES MEASUREMENTS STATE ESTIMATOR 5 10 min refresh cycle BUS / BREAKER MODEL POWER SYSTEM NODE / BRANCH MODEL SUPERVISED NETWORK CONTINGENCIES DYNAMIC DATA NON SUPERVISED NETWORK STATIC AND DYNAMIC SECURITY ASSESSMENT (SDSA) RESULTS VOLTAGE SECURITY ASSESSMENT (VSA) TRANSIENT SECURITY ASSESSMENT (TSA) SMALL SIGNAL STABILITY ASSESSMENT (SSSA)... Graphical Display ADDITIONAL FUNCTIONS

6 Structureofa SDSA Tool 6 Proposed Architecture 5 10 min refresh cycle POWER SYSTEM CONTINGENCIES DYNAMIC DATA NON SUPERVISED NETWORK STATIC AND DYNAMIC SECURITY ASSESSMENT (SDSA) RESULTS Visor Chart ANAREDE (Power Flow & Contingency Analysis) ANATEM (Transient Stability Analysis) PACDYN (Small Signal Stability Analysis)... FLUPOT (Optimal Power Flow)

7 Structureofa SDSA Tool 7 Prototype Architecture Database CONTINGENCIES DYNAMIC DATA POWER SYSTEM STATIC AND DYNAMIC SECURITY ASSESSMENT (SDSA) ANAREDE (Power Flow & Contingency Analysis) ANATEM (Transient Stability Analysis) RESULTS Visor Chart

8 Basic Concepts 8 tie lines Generation Groups Export Area Generation Transfer Import Area G1 Slack generation group is responsible for load and generation balance Operating Point Generation Transfer Step Infeasible (reference) Feasible Security or Generation Limit Curve

9 Basic Concepts Limit Search Strategy Violation! Limit Violation! Feasible Operating Point Reduced Generation Transfer Step 6 7 Last Feasible Operating Point 1 Infeasible Operating Point Infeasible Operating Point Active Generation Transfer Direction Initial Generation Transfer Step Stopping Criteria Violation OR Power Flow Divergence OR Power Flow Non Convergence

10 Basic Concepts Limit Search Strategy 2 10 Last Feasible Operating Point 4 2 Violation! Limit Violation! Feasible Operating Point 6 5 Infeasible Operating Infeasible Operating 3 Point Point Active Generation Transfer Direction 1 Stopping Criteria Reduced Generation Transfer Step < Minimum Generation Transfer Step Violation OR Power Flow Divergence OR Power Flow Non Convergence OR Maximum Number of Consecutive Reductions of the Generation Transfer Step OR Current Generation Transfer Step < Minimum Generation Transfer Step

11 Software Integration 11 Run Manager Contingencies VisorChart Base Case ANAREDE (Power Flow) Operating Points ANATEM (Transient Stability) Database Dynamic Data Modified Dynamic Data Snap Shot SSRs DSRs SDSA Results Results Manager GCC

12 Brazilian Interconnected Power System Operation Planning Case December 2011 ONS Peak Load 4666 buses / 217 generators 20 generation transfer directions / 5 contingencies 1 HVDC link (Itaipu) / 15 SVCs 778 UDCs / UDC blocks All controllers modeled as ANATEM UDCs 12 Static Security Region ZIP Load Dynamic Security Region ZIP Load

13 Brazilian Interconnected Power System Operation Planning Case December 2011 Computational Performance (BIPS case 4666 buses / 217 generators) Cluster SGI Altix ICE 8400 at NACAD/COPPE-UFRJ composed of 640 Cores 64 CPUs Six Core Intel Xeon X5650 (Westmere), 2.67 GHz: 384 Cores 64 CPUs Quad Core Intel Xeon X5355 (Clovertown), 2.66 GHz: 256 Cores 1.28 TBytes RAM and Infiniband QDR, DDR and Gigabit networks 1 core / 30255,27s = 8h24min 120 cores / 309,46s = 5min10s < 10 min refresh cycle 13

14 Brazilian Interconnected Power System Real Time Case February Run Manager Contingencies VisorChart Base Case ANAREDE (Power Flow) Operating Points ANATEM (Transient Stability) Database Dynamic Data Modified Dynamic Data Snap Shot SSRs DSRs SDSA Results Results Manager

15 Brazilian Interconnected Power System Real Time Case February2014 ONS Medium Load 4514 AC buses 6168 AC circuits 686 individualized generators (481 modeled) 1902 UDCs UDC blocks HVDC links (Itaipu and Garabi) 26 SVCs 20 generation transfer directions / 5 contingencies 15

16 Brazilian Interconnected Power System Real Time Case February Rotor angle (deg) Time (s) Generator rotor angles from a no-fault dynamic simulation. Load = 50% constant P 50% constant Z.

17 17 Brazilian Interconnected Power System Real Time Case February2014 Rotor angle de eviation (deg) Time (s) Generator rotor angle deviations from a no-fault dynamic simulation. Load = 50% constant P 50% constant Z.

18 Brazilian Interconnected Power System Real Time Case 18 Itaipu 14GW 10 x 700 MW 60Hz 10 x 700 MW 50Hz 17% of Brazilian Energy Demand 80ms short circuit at Foz 765 kv + Foz Ivaiporã 2 transmission lines outage Load = 50% constant P 50% constant Z.

19 Brazilian Interconnected Power System Real Time Case 19 Rotor angl le (deg) Time (s) Generator rotor angles - 80ms short circuit at Foz 765 kv + Foz Ivaiporã 2 lines outage dynamic simulation. Load = 50% constant P 50% constant Z.

20 Brazilian Interconnected Power System Real Time Case x Operation Planning Case 20 February 2014 Medium Load 4514 AC buses 6198 AC circuits 2065 power transformers 481 generators 1902 UDCs UDC blocks HVDC links (Itaipu and Garabi) 26 SVCs February 2014 Medium Load 5442 AC buses 7610 AC circuits 2811 power transformers 267 generators groups (power plants) 1045 UDCs UDC blocks HVDC links (Itaipu and Garabi) 26 SVCs

21 Brazilian Interconnected Power System Real Time Case x Operation Planning Case 21 Itaipu 60Hz Operation Planning Case ONS Database Rotor angle (deg) Time (s) Itaipu 60Hz Real Time Case SAGE EMS Rotor angle (deg) Time (s) Short circuit at Foz do Iguacu 765kV followed by Foz-Ivaiporã 2 transmission lines outage.

22 Brazilian Interconnected Power System Real Time Case x Operation Planning Case Hz Itaipu Rotor ang gle (deg) Real Time Case Operation Planning Case Time (s) Short circuit at Foz do Iguacu 765kV followed by Foz-Ivaiporã 2 transmission lines outage.

23 Brazilian Interconnected Power System Real Time Case x Operation Planning Case 23 Tucu urui Rotor ang gle (deg) Operation Planning Case Real Time Case Time (s) Short circuit at Foz do Iguacu 765kV followed by Foz-Ivaiporã 2 transmission lines outage.

24 Conclusions 24 Integration of power system simulation engines is a feasible approach. Using conventional time domain simulation and accurate dynamic models fits into a reasonable time window. Similar results were obtained for the real time case and the operation planning case. Using accurate dynamic models is an advantage. Properly initialized dynamic models are key to a smooth start of more realistic DSA simulations. Access to detailed dynamic models is essential for the quality of simulation results.

25 Future Work 25 Automatic procedures to eliminate dynamic model data edition. Fully integrate the SDSA tool with Cepel s EMS. Additional tests using different load/generation scenarios. Improve parallelization strategies. Develop algorithms to early interrupt unstable transient stability simulations. Develop topology sharing among UDCs. Aggregate similar generators. Explore alternative security indexes and result visualization. Model remedial action schemes and special protection schemes. Improve the performance of desktop and hybrid versions for offline studies.