一种无变频器式舰船交流电力推进系统稳态特性分析

为提高舰船电力推进系统功率密度,降低振动噪声,提出了一种基于永磁同步电机的无变频器式舰船交流电力推进系统。该系统将永磁同步电机作为推进电机,原动机与电励磁发电机直连,发电机与推进电机通过电缆直连。通过原动机调速实现推进电机转速调节,通过发电机励磁调节实现推进电机电压调节。建立了该电力推进系统静态数学模型,推导了系统主要电气量与发电机励磁电流及推进电机负载转矩间的函数关系,分析了系统的静态稳定性条件,分析了不同转速工况下和电机参数匹配条件下各电气量随发电机励磁电流的变化规律。数字仿真结果验证了所建立的静态数学模型及理论分析结果的准确性。

Study on Steady-State Characteristics of a Shipboard AC Electric Propulsion System with no Converters

A shipboard AC Electric Propulsion System based on permanent magnet propulsion motor (PMSM) and with non -variable-freqency governor is proposed, in order to improve the power density of electric propulsion system and reduce the vibration noise. In this system, prime mover and electric excitation generator are connected directly, so are electric excitation generator and PMSM with electrical cables. Speed governing of propulsion motor is carried out with the governing of prime mover, and voltage regulation of propulsion motor is carried out with adjustment of field current of generator. Steady-state mathematical model is established and functional relationships of major electrical variables, field current of generator and load torque of propulsion motor are deduced. Steady-state stability conditions and variation regularities of major electrical variables and field current of generator are analyzed. Validity and precision of mathematical model and theoretical analysis are verified by mathematical simulation.