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Analysis the Impact of Wind Power Plants on Power System Small Signal Stability

Jafarian, Mohammad | 2014

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 45763 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Ranjbar, Ali Mohammad
  7. Abstract:
  8. As long as the wind power penetration is low, overall dynamic behavior of a power system is determined by the interactions of system synchronous generators, but introduction of large amounts of new wind generation can affect the power system behavior. In this research, the impact of large wind farms on the small signal stability of power systems is studied. Because constant wind turbines are not very conventional in today’s wind industry and the dynamics of full converter wind turbines are isolated from power system, in this study only the doubly fed wind turbines are considered. In this order, a novel index is introduced to analyze the impact of doubly fed wind farms on the damping of system electromechanical oscillations. This index is implemented on a one-machine/infinite-bus test system and then extended to be used in a four-machine/infinite-bus test system. Modal analysis and time domain simulations are used to verigy the results.In the one-achine/infinite-bus system it is shown that when the wind farm is operating at super- ynchronous speed, the wind turbine active power control loop detrimentally interacts with the system electromechanical mode and decrease the damping of this modfe. With the increase in wind farm rating and decrease in the electrical distance between wind farm connection point and synchronous generator, the interaction strengthens. In the four-machine/infinite-bus system, it is shown that with the integration of the wind farm the damping of system inter-are oscillation increases, but there are circumstances where the damping of one of the system local oscillations decreases. Afterwards it is shown that with the help of the developed index, it is possible to regulate the control gains of DFIG wind turbines in order to increase the damping of system oscillations, while preserving the dynamic performance of wind farm. At the end the impact of DFIG based wind farms on the system torsional oscillations is investigated and it is shown in IEEE first benchmark system that when the wind farm is operating at super-synchronous mode, the wind farm voltage control loop detrimentally interacts with one of the system torsional modes and makes it unstable.
  9. Keywords:
  10. Small Signal Stability ; Wind Turbine ; Damping ; Electromechanical Oscillations

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