Loading...

Analysis and Improvement of Transients and Stability of Electric Shipboards Against Load Disturbances

Zarif Mansour, Milad | 2018

509 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51108 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Parniani, Mostafa
  7. Abstract:
  8. Nowadays, According to the improvement of technology, especially in power electronics, electric shipboards are preferred over traditional ones. Better maneuverability, lower emission, higher efficiency and reliability are the most conspicuous merits of this type of ships. Notwithstanding the fact that electric shipboards have many advantages, some serious problems may arise in these ships. Since the thruster motors of these ships are usually induction motors and they are fed by the microgrid of the ship, and taking into ACcount that thruster motors consume a huge amount of the generated power by the synchronous generators, the concept of infinite bus is inexistent in these microgrids. Hence, this microgrid may experience voltage instability and harmful voltage transients when a large disturbance such as the start of the thruster motors occurs. The purpose of this thesis is conquering this problem. To this end, in the first place, the elements of this microgrid are investigated in order to analyze their effect on the stability of the grid. Afterward, two remedies have been suggested and implemented in the grid. The first approach is using an Active front end as the drive of the thruster motors, and controlling the injected or absorbed reActive power, in order to control the grid. The proposed method is designing an optimal time controller and implementing it in the excitation system, in parallel with the AVR of the generator. By doing so, the reaction of the generator to the change of the grid voltage will be faster. Thus, voltage stability will be enhanced
  9. Keywords:
  10. Voltage Stability ; Transient Analysis ; Voltage Regulator ; Electric Shipboard ; Optimal Time Controller

 Digital Object List

 Bookmark

No TOC