wind farms with hvdc delivery in load frequency control n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Wind farms with HVDC delivery in Load Frequency Control PowerPoint Presentation
Download Presentation
Wind farms with HVDC delivery in Load Frequency Control

Loading in 2 Seconds...

play fullscreen
1 / 13

Wind farms with HVDC delivery in Load Frequency Control - PowerPoint PPT Presentation


  • 118 Views
  • Uploaded on

Wind farms with HVDC delivery in Load Frequency Control. Lingling Fan April 22, 2010. Wind farm + HVDC . Why use HVDC to deliver wind power? Off-shore wind farm, dc cable is preferred for undersea use (no need of shunt reactive power compensation)

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Wind farms with HVDC delivery in Load Frequency Control' - suzuki


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
wind farm hvdc
Wind farm + HVDC
  • Why use HVDC to deliver wind power?
    • Off-shore wind farm, dc cable is preferred for undersea use (no need of shunt reactive power compensation)
    • Large-scale wind power, the existing ac system is already congested
      • Injecting large wind power at any point could cause congestion in other lines – we cannot control flows in ac lines (KCL, KVL).
      • We like point to point transmission (from generation to load)--- HVDC.
problem identified
Problem identified
  • Wind farms are not traditional synchronous generators
    • Doubly fed induction generator
    • Permanent magnet synchronous generator
    • Interconnected with the grid partially or fully by converters
  • The output power level follows maximum wind power (Maximum Power Point Tracking)
  • What about load sharing or primary frequency response?
  • No existing research addressed such problem.
frequency response
Frequency response
  • Primary frequency response
    • If there is increase in loads in the grid, rotating masses of synchronous generators will release kinetic energy, the grid frequency will drop.
    • In turn, each turbine will increase its output – mechanical power until Pm=Pe
  • How can wind farms with HVDC delivery participate in frequency response?
things to be considered
Things to be considered
  • There should be spinning reserve in wind farms to participate load sharing.
  • Wind farms cannot operate at maximum power point tracking mode. Need 20% margin.
  • HVDC delivering power is controllable through firing angle of the converters.
    • We can design a feedback control to force HVDC delivering power responding to frequency change
    • We can then think about how Pm and Pe get balanced in wind farms.
study case
Study case

G2 (600 MW) will be tripped. The system frequency will decrease. G1, G3 and G4 will increase their output power levels to make up 600 MW.

Wind power with HVDC delivery is planned to participate in load sharing.

coordination in wind farms
Coordination in wind farms
  • Wind turbine has pitch controllers to change pitch angle to change wind power extracted.
  • Pitch controllers measure the rotating speed. If it is too high, reduce wind power by increasing pitch angle. Too low, increase wind power by reducing pitch angle
  • If the electric power increases, the rotating speed decreases. Pitch angle decreases, the mechanical power increases to match the electric power.
conclusions
Conclusions
  • Wind farms with HVDC delivery can participate in load sharing by introducing a feedback control loop
  • Pitch controllers help balance the powers in wind farms.
  • Operating margin should be left for primary frequency response by wind farms