TAILIEUCHUNG - Summary of doctoral thesis: Improving the efficiency in using double fed induction machine in shaft generator system on shipboards

Aims doctoral thesis: The application of doubly - fed induction machine on power-station on shipboard ensures that the two work modes working in parallel with the grid of shipboard and work independently when requiring. | MINSTRY OF EUCATION AND TRANING HANOI UNIVESITY TRANSPORT AND COMMUNICATIONS NGUYEN TRONG THANG IMPROVING THE EFFICIENCY IN USING DOUBLE-FED INDUCTION MACHINE IN SHAFT GENERATOR SYSTEM ON SHIPBOARDS Major Technology of Control and Automation Code SUMMARY OF DOCTORAL THESIS HÀ NỘI- 2014 The thesis was completed at Hanoi University of Transport and Communications Supervisor 1. . Dr Nguyen Tien Ban 2. . Dr Nguyen Thanh Hai Reviewer 1 . Reviewer 2 . Reviewer 3 . This thesis will be defended at Universitarian dissertation Committee at University of Transport and Communications. At . .hour date. .month. .year. The thesis can be found at National Library Library of University of Transport and Communications. 1 INTRODUCTION Brief The thesis studies the shaft generator system using doubly-fed induction machine on power-station on shipboards for providing solutions to improve the efficiency of energy production and saving operating costs on shipboards. The thesis consists of 4 chapters 113 pages 97 references 54 figures and graphs. Rationale While running on the sea on the stable environment in climate and weather the main engine propeller of shipboard often is not at full power mode to take advantage of this excess power the large shipboard often is designed with shaft generator working together with the diesel-generator. However one of the complex technical issues is the stabilizing in frequency and voltage of the shaft generator when the speed of the main machine changing with the large limit one of the effective technical solution is that using doubly-fed induction machine working in generator mode. The advantages of DFIG in the power generation systems is that the stator is connected directly to the grid and the rotor is connected to the grid through the control circuit. Because the control circuit is in the rotor the power of the control circuit is much less than the power fed in to the grid and the generating power is fed into the grid .

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