Research On Power Flow Calculation Of Ship AC Power System

This thesis probes into the calculation of the load flow calculation of ship AC power system based on the characteristics of ship power system and the calculation of the load flow of land power system with ship AC power system as the object of study.First, the three-phase mathematic model is built according to the characteristics of ship power system and also the detailed process of deduction for the three-phase transformer and load of wye delta connection in this mathematical model which lays the foundation for the calculation method of load flow.Second, through the study of the calculation method of classic land power supply network and distribution network flow, according to the traits of ship power system network, the respective advantages of Gauss-Sadal method in the power supply network and forward backward method in the distribution network are both applied to ship AC power system to accomplish the calculation of the load flow of ship power system by means of iteration calculation for obtaining the final value which is satisfied the convergence condition of presetting.Third, multiple iteration calculations are needed in the power system calculation to obtain an exact value. Therefore, it is vital to employ a convenient and quick flow calculation software. But at the mean time, there is no uniform calculation software which can be applied to civil ships in lack of a mature calculation method of ship power load flow. Besides, due to the widespread application and rapid development of electrically-propelled ships, the calculation software demands continuous improvement and amelioration. In consequence, by means of calling MATLAB engine by Visual C++ software this paper conducts the flow calculation by the method of inputting the real-time data visually and it also verifies the load flow calculation method put forward in this paper by the example.In the end, the author concludes the whole thesis and looks forward to the prospect of the application of flow calculation of ship power system.