Transient Stability Analysis Of Ship Integrated Electric Propulsion System

With the rapid development of marine transport industry,the type number of modern ships is increasing and the environmental pollution is becoming increasingly serious.So people have more requirements of the ship's own characteristics.Under this circumstance,the ship power propulsion system have been rapidly developed because of its high mobility,low pollution and many other advantages.As the ship integrated electric propulsion system is a stand-alone and capacity-limited power system,the investment and resection of the propulsion load will cause the fluctuations of the system power and voltage.When the ship sails,it will always change the working conditions,the change of working conditions determines the investment number of generators,the parallel and splitting operation may causes the system instability.And most ship electrical equipment installed in wet and enclosure environment,it is easy to occur short-circuit fault and then affect the system transient stability.In order to explore the exact influence of the above disturbance on system transient process,this paper does research on the transient stability of ship integrated electric propulsion system,include research on power angle stability analysis and voltage stability analysis under the typical large disturbance conditions.Firstly,according to the ideology of the modularize modeling to establish the mathematical which apply to the analysis of ship integrated electric propulsion system transient stability,it embraces from generating plants to load-side,then describes the parameter coupling relationship between modules.The mathematical models above are packaged into the modular simulation platform of ship integrated electric propulsion system by using Visual Studio 2010 and database software.Secondly,using time-domain simulation as the analysis method of system transient stability,respectively to research for the system transient simulation analysis on shock loading and short-circuit fault by the simulation platform.Through the analysis of the simulation results,the system voltage is on the critical state of stability and through the analysis of the simulation results to make sure short-circuit current calculation under the system short circuit fault,to provide the disturbance environment for the system becoming transient stability analysis.Thirdly,transient stability analysis take the multiprocessor system as the research object.So taking research on generator parallel operation control,including thegrid-connection control of the time when put into operation for the generator,the power distribution control of among generator after the success of parallel operation.In order to achieve the power-transfer which is stable and balanced among the generator,the passage use virtual difference regulation method of high applicability and low binding force to make power distribution,and to improve the system in reliability and stability.Finally,the transient stability simulation analysis of the three typical disturbance condition of the ship integrated electric propulsion system are respectively carried out.Mainly including the analysis of power angle stability and voltage stability,combining the simulation results and the stability criterion,to analyze the ability of keeping synchronous stable operation and the dynamic performance of all state variable in the process disturbance.Provide the evidence of stability for the system safety and reliable operation.