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Out-of-Step Protection Enhancement of Synchronous Generators Employing the Speed Sensor Signal

Hassanian, Mohammad | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57557 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Hajipour, Ehsan
  7. Abstract:
  8. The synchronous generator is one of the main components of the power system, which plays a very important role in its stability. The angular stability of the synchronous generator is related to the balance between the input mechanical power and the output active power. Faults in the power system, generator switching, load switching, transmission line switching, generator input mechanical power interruption and generator excitation circuit fault cause the generator rotor angle to swing. The stability or instability of the generator depends on the intensity of the disturbance. The out-of-step function is responsible for detecting the instability of the generator. Impedance-based methods are the most common method for out-of-step detection, which requires extensive transient stability studies. In this thesis, an out-of-step detection algorithm is designed only based on the speed sensor data of turbine overspeed protection. The aim is to propose a path completely independent of electrical measurements of the generator to detect this phenomenon. In this case, any disturbance in the measurement of electrical signals, such as the failure of the current and voltage sensors, will have no effect on the operation of the out-of-step function. Therefore, the aim of this thesis is to separate the generator excitation circuit fault from other transients using the second derivative data of the generator speed and to detect the out-of-step of synchronous generator using the generator speed, its first derivative and its second derivative data. The desired type of instability is the angular instability of a synchronous generator with respect to the power system. The proposed algorithm has been tested on the grid with two similar round rotor synchronous generators in parallel, two similar transformers in parallel, two similar transmission lines in parallel, one load and infinite bus and the results show that the proposed algorithm works correctly in all cases with limited noise
  9. Keywords:
  10. Synchronous Generator ; Stability ; Speed Sensor ; Power Fluctuation ; Rotor Angle ; Out-of-Step

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