Due to the harsh and changeable marine environment,one low speed stator-permanent magnet machine named doubly salient permanent magnet machine with toothed pole is applied for marine current energy conversion system.I...Due to the harsh and changeable marine environment,one low speed stator-permanent magnet machine named doubly salient permanent magnet machine with toothed pole is applied for marine current energy conversion system.Indeed,this machine has simple structure,intriguing fault tolerance,and higher power density,which could adequately satisfy the different complicated operation conditions.However,its permanent magnet flux-linkage has the same variation period as the inductance which leads to a strong nonlinear coupling system.Moreover,the torque ripple caused by this special characteristics,uncertainty of system parameters and disturbance of load greatly increases the difficulty of control in this strongly coupling system.Consequently,the classical linear PI controller is difficult to meet the system requirement.In this paper,the high-order sliding mode control strategy based on the super-twisting algorithm for this system is creatively utilized for the first time.The stability of the system within a limited time is also proved with a quadratic Lyapunov function.The relative simulation results demonstrate convincingly that,the high-order sliding mode control has little chattering,high control accuracy and strong robustness.展开更多
Considering the salient pole and high magnetic nonlinearity of the electromagnetic doubly salient(EMDS)DC generator,a 12/8 pole prototype EMDS generator is designed and calculated using a 2-D finite element method(FEM...Considering the salient pole and high magnetic nonlinearity of the electromagnetic doubly salient(EMDS)DC generator,a 12/8 pole prototype EMDS generator is designed and calculated using a 2-D finite element method(FEM).The phenomenon is analyzed and that the phase voltage wave changes between 120°and 180°.The influence of the exciting current and armature reaction on the DC voltage ripple of the generator is discussed in detail,and the nonlinear rules are gained that DC voltage ripple changes accordingly.The theoretical analysis is verified by the simulation and experimental results.The results are helpful for the optimal design of the generator and the optimal control of exciting-winding.We conclude that the filter-capacitance of the rectifier can be designed.展开更多
基金This work was supported by National Natural Science Foundation of China,China(Grant No:61503242)Nat-ural Science Foundation of Shanghai,China(15ZR1419800).
文摘Due to the harsh and changeable marine environment,one low speed stator-permanent magnet machine named doubly salient permanent magnet machine with toothed pole is applied for marine current energy conversion system.Indeed,this machine has simple structure,intriguing fault tolerance,and higher power density,which could adequately satisfy the different complicated operation conditions.However,its permanent magnet flux-linkage has the same variation period as the inductance which leads to a strong nonlinear coupling system.Moreover,the torque ripple caused by this special characteristics,uncertainty of system parameters and disturbance of load greatly increases the difficulty of control in this strongly coupling system.Consequently,the classical linear PI controller is difficult to meet the system requirement.In this paper,the high-order sliding mode control strategy based on the super-twisting algorithm for this system is creatively utilized for the first time.The stability of the system within a limited time is also proved with a quadratic Lyapunov function.The relative simulation results demonstrate convincingly that,the high-order sliding mode control has little chattering,high control accuracy and strong robustness.
基金supported by the National Natural Science Foundation of China(Grant No.50337030).
文摘Considering the salient pole and high magnetic nonlinearity of the electromagnetic doubly salient(EMDS)DC generator,a 12/8 pole prototype EMDS generator is designed and calculated using a 2-D finite element method(FEM).The phenomenon is analyzed and that the phase voltage wave changes between 120°and 180°.The influence of the exciting current and armature reaction on the DC voltage ripple of the generator is discussed in detail,and the nonlinear rules are gained that DC voltage ripple changes accordingly.The theoretical analysis is verified by the simulation and experimental results.The results are helpful for the optimal design of the generator and the optimal control of exciting-winding.We conclude that the filter-capacitance of the rectifier can be designed.