Abstract
Targeting at reduce the difficulty of fault protection of a modern more-electric ship (MES), a doubly-fed induction motor (DFIM) based shipboard propulsion system (SPS) is proposed. The on-board electric power supply is provided by a synchronous generators (SG). Therefore, the accurate parameter setting is important for achieving the optimal system performance. In this paper, the effects of parameter deviations (PDs) in SG on the system performance are studied. The detailed models of a salient-pole SG and a type DC1A excitation system (EXS) are presented. Different degrees of PDs (DoPDs) are applied to 8 important parameters of SG to analyze the sensitivity of each parameter. Simulation studies are carried out in Matlab/Simulink to obtain data for investigating the PD effects. Three PD effect indicators (PDEIs) are defined to illustrate the effects on the SG terminal voltage and output active power. Meanwhile, when applying different DoPDs, the increasing rates of PDEIs are different, which are also investigated. Moreover, the two most critical SG parameters are determined, and the overall system performance is analyzed when applying different DoPDs on these two parameters.
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