船舶电力推进DTC系统低速性能的改善研究

针对船舶电力推进传统直接转矩控制(DTC)技术低速性能差的问题,引入模糊控制对定子电阻进行在线辨识。引入空间矢量脉宽调剂技术(SVPWM)来减低转矩与电流的脉动;并且使开关频率得到固定。另外由于船舶推进时易受外界干扰的影响,导致基于固定PI参数的速度调节器不能实时跟踪动态的外界环境干扰,因此引入模糊自适应PID对速度调节器进行动态整定。仿真结果表明引入模糊控制和空间矢量脉宽调剂技术后,低速性能及动态性能得到显著改善。

The improvement study of low speed performance in ship electric propulsion DTC system

According to the poor performance at low speed in ship electric propulsion traditional DTC technology, Including: the stator flux distort,caused by influence of stator resistance in U-I flux observation model; Torque and current ripple is bigger ;The unfixed switching frequency makes the switching loss and noise incrensed.Thus, in this paper, the fuzzy control is introduced to online identify stator resistance ,and adopt SVM technology to reduce torque and current ripple,it also makes the switch frequency fixed.Besides,because of ship propulsion is susceptible to external interference effect,that result based on a fixed PI parameters of the speed regulator can not be real-time tracking dynamic environment interference.So,the method of fuzzy adaptive PID is adapted to dynamic set the parameters.The simulation in matlab/simulink results show that the low speed performance and dynamic performance can be improved significantly after fuzzy control and SVM technology are adapted.