| More and more power electronic converters were being taken with the development ofship integrated power systems. The nonlinear characteristics of power electronic would causethe interaction between converters and other system issues. The system interaction andassisted control technology has been an important research subject to improve the stability ofsystem. In this dissertation, the stability of ship power converter system, the interactionbetween the system modules control strategy of source and load converter were researched.This dissertation presented an overview of ship power integrated system, and the currentresearch state and hot issue including typical issues and challenges in the practical applicationwere demonstrated at first. The ESAC was taken as stability analysis criterion, and theinput/output impedance prohibited area of power converters was defined. The impedancemodule of power converters in ship power integrated systems was given for theoreticalanalysis and application later.Secondly, the power converters were classified by function and location in the DC zonaldistributed system, and the detail simply rules was presented. An stability analysis methodwas given and the structure of two bus with two generation, one bus with two generation andone bus with one generation were analysis, the stability control were taken when theinstability occurred.Thirdly, the constant power load characteristic of load converter and its impact on thestability was analyzed. For improving the output impedance of source converter and systemstability, a one cycle control with voltage and current feedback and an active damping controlwere proposed to improve the output impedance of source converters. The simulation andexperiment verified the control was simple and effective.Then, the interaction of power converters and the effect of source converters outputimpedance were demonstrated. An adaptive gain feed forward control was taken to reduce theinteraction. Besides, the effect of one cycle control to restress the input voltage disturbance,and the input impedance of load converters was optimized designed to improve systemstability.Lastly, the input impedance and its influencing factors of asynchronous motor wereanalyzed and a negative input impedance compensator was designed. The simulation resultshowed the interaction between motor and dc bus would be decreased by the compensator andthe system stability would be improved. The correctness of the theory analysis and research was verified by the simulation andexperimental results in this dissertation. These works provided design and optimizationfoundation of ship integrated power system based power converter. |
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