Operational Planning of Electric Power System with Multi-terminal - PowerPoint PPT Presentation

Electric Power Engineering Operational Planning of Electric Power System with Multi-terminal VSC-HVDC Ph.D. student: Wang Feng Supervisor and Examiner: Prof. Lina Bertling Co-supervisor: Tuan Le (Chalmers) Anders Mannikoff (SP) Anders Bergman (SP) Financial support: Chalmers Energy Initiative (CEI) Partners: Chalmers University of technology, SP Technical Research Institute of Sweden 2011-12-02 Chalmers Energy Initiative

Electric Power Engineering Outline • State-of-the-art of VSC-HVDC – VSC Topologies – Modeling and Control • Project examples • Potential applications • Summary from literature review • Example results • Further work F. Wang Operational Planning of Electric Power System with Multi-terminal VSC-HVDC Dec. 02, 2011 1

Electric Power Engineering State-of-the-art of VSC HVDC: VSC Topologies Two Level Converter Multi Level Converter Half Bridge Full Bridge MMC (Half Bridge) Neutral Point Clamped (NPC) three level converter * Two level Converter Modular Multilevel Converter (MMC) ** MMC (Full Bridge) * A. Nabae, I. Takahashi, and H. Akagi, "A New Neutral-Point- ** R. Marquardt, "Modular Multilevel Converter: An universal Clamped PWM Inverter," Industry Applications, IEEE Transactions concept for HVDC-Networks and extended DC-Bus-applications," in on, vol. IA-17, pp. 518-523, 1981. Power Electronics Conference (IPEC), 2010 International , 2010. F. Wang Operational Planning of Electric Power System with Multi-terminal VSC-HVDC Dec. 02, 2011 2

Electric Power Engineering State-of-the-art of VSC HVDC: Modeling and Control P+Resonant controller in stationary frame * Power-Synchronization controller in synchronous frame ** Linear PI controller in synchronous frame * R. Teodorescu, F. Blaabjerg, M. Liserre, and P. C. Loh, "Proportional-resonant controllers and filters for grid- ** Z. Lidong, L. Harnefors, and H. P. Nee, "Interconnection of Two Very Weak AC Systems by VSC-HVDC Links Using connected voltage-source converters," Electric Power Applications , IEE Proceedings -, vol. 153, pp. 750-762, 2006. Power-Synchronization Control," Power Systems, IEEE Transactions on, vol. 26, pp. 344-355, 2011. F. Wang Operational Planning of Electric Power System with Multi-terminal VSC-HVDC Dec. 02, 2011 3

Electric Power Engineering Example Projects Project Name Project Name Project Name Trans Bay Cable, South West link, Caprivi Link, Sweden/Norway Namibia USA Year of Year of South part 2014 Year of 2010 2009 Commissioning Commissioning West part 2016 Commissioning (Scheduled) 400 MW, Power Rating 300 MW Power Rating South part: ±170 MVAr Power Rating 2×600 MW DC Voltage 350 kV DC Voltage ±200 kV DC Voltage ±300 kV Remarkable: Remarkable: Connection two weak system via long The first project using MMC Remarkable: overhead lines The first multi-terminal VSC HVDC http://www.automation.com http://www.siemens.com http://www.svk.se system F. Wang Operational Planning of Electric Power System with Multi-terminal VSC-HVDC Dec. 02, 2011 4

Electric Power Engineering Potential Applications • Multi-terminal VSC-HVDC • Hybrid System of CSC and VSC • Segmentation of AC Grid • Meshed DC grid Supplying power to urban load center using Multi-termianl VSC-HVDC 2 Integration of Wind farms using Multi-termianl VSC-HVDC 1 Hybrid application of CSC and VSC-HVDC 3 Segmentation of ac grid using VSC-HVDC 4 2. X. Lie, B. W. Williams, and Y. Liangzhong, "Multi- 1. R. da Silva, R. Teodorescu, and P. Rodriguez, "Power 4. H. Clark, A. A. Edris, M. El-Gasseir, K. Epp, A. Isaacs, 3. B. R. Andersen and X. Lie, "Hybrid HVDC system for terminal DC transmission systems for connecting large delivery in multiterminal VSC-HVDC transmission and D. Woodford, "Softening the Blow of Disturbances" power transmission to island networks" (in Proc. (Power and Energy Magazine, IEEE, vol. 6, 2008, pages Transmission and Distribution Conference and Exposition, offshore wind farms" (in Proc. Power and Energy Society system for offshore wind power applications" (in Proc. General Meeting - Conversion and Delivery of Electrical Innovative Smart Grid Technologies Conference Europe 30-41). 2003 IEEE PES, 2003, pages. 55-60 Vol.1). Energy in the 21st Century, 2008 IEEE, 2008, pages. 1-7). (ISGT Europe), 2010 IEEE PES, 2010, pages. 1-8) F. Wang Operational Planning of Electric Power System with Multi-terminal VSC-HVDC Dec. 02, 2011 5

Electric Power Engineering Summary from Literature Review The most important aspects concerning this technology include: • Applications of MMC in HVDC • New modelling and control methods of VSC • Future applications of VSC will be multi-terminal VSC HVDC and/or DC grid • Research studies on operations of mixed DC and AC grid at the system level will be more demanding. F. Wang Operational Planning of Electric Power System with Multi-terminal VSC-HVDC Dec. 02, 2011 6

Electric Power Engineering Example Results M ain : AC source VS C 1 : C ontrols VS C ... S 1 S v S 1 S ph S 1 S f S 1 P ref S 1 Q ref S 1 U dcref S 1 U dc/P C trl Three-terminal VSC-HVDC model 450 90 55 700 700 700 P Udc Degree kV Hz (preliminary) in PSCAD/EMTDC 0 -90 45 -700 -700 -700 367 0 50 0 0 600 1 VS C 1 : C ontrols VS C 2 : C ontrols S 1_U dcfil S 1_P dc S 2_U dcfil S 2_P dc 599.989 296.333 594.573 323.071 P = -301.4 P = -328.2 0.0291 ohm/km X 200 km Q = -0.06018 Q = -0.0599 V F Ph Ph F V V = 367.3 V = 367.3 VSC1 VSC2 0.0001 [H] 0.0001 [H] 5.82 [ohm] A A V V 5.82 [ohm] 2.91 [ohm] 2.91 [ohm] 0.0291 ohm/km X 100 km VS C 3 : C ontrols S 3 U dcfil S 3 P dc P = 600 Q = -0.03626 Ph F V V = 367.3 VSC3 0.0001 [H] A V 588.539 -609.395 F. Wang Operational Planning of Electric Power System with Multi-terminal VSC-HVDC Dec. 02, 2011 7

Electric Power Engineering Further work • Steady state study • Joint AC and DC load flow calculation • Optimal operation study in steady state condition • Dynamic study • VSC model simplification for dynamic studies in the system level • Multi-terminal VSC-HVDC system development using simplified VSC model in the system dynamic study platform • Interaction study between AC and DC system F. Wang Operational Planning of Electric Power System with Multi-terminal VSC-HVDC Dec. 02, 2011 8

Electric Power Engineering Questions or comments? Thank Thank you you ! ! F. Wang Operational Planning of Electric Power System with Multi-terminal VSC-HVDC Dec. 02, 2011 9

Electric Power Engineering Contact Information Wang Feng Electric Power Engineering Energy and Environment Department Chalmers University of Technology SE-412 96 Gothenburg, Sweden +46 73 658 6258 feng.wang@chalmers.se http://www.chalmers.se http://www.chalmers.se/ee/EN/research/research-divisions/epe F. Wang Operational Planning of Electric Power System with Multi-terminal VSC-HVDC Dec. 02, 2011 10