The dynamic model for a bidirectional driven float-type wave power generation system design is presented in this paper.The gravity,buoyancy and drag force acting on the wave energy converter(WEC)are all analyzed.The a...The dynamic model for a bidirectional driven float-type wave power generation system design is presented in this paper.The gravity,buoyancy and drag force acting on the wave energy converter(WEC)are all analyzed.The analytical expression of the torque applied on the rotor is given based on a linear model of the switched reluctance generator(SRG).The SRG usually rotates with low velocity in the WEC system.In this situation,current chopping control(CCC)is adopted with fixed turn-on angle and turn-off angle control mode to have a quick response for SRG.Further,in order to make the float keep in phase with the wave so as to improve the power generation efficiency,the reference current is dynamically adjusted according to the wave motion at all working stages.Then maximum power point tracking(MPPT)of system is achieved.A simulation model is developed in MATLAB for the bidirectional driven float-type wave power generation system with real wave statistical characteristics taken into account.Simulation results show that the WEC can output desired torque periodically with high efficiency and good adaptability.Therefore,the feasibility of applying a SRG in a WEC is also verified.展开更多
A novel current chopping mode was used in a switched reluctance motor drive system to make full use of the characteristics of digital signal processor (DSP) TMS320F240. The necessity of this 180° phase-shift curr...A novel current chopping mode was used in a switched reluctance motor drive system to make full use of the characteristics of digital signal processor (DSP) TMS320F240. The necessity of this 180° phase-shift current control (PSCC) mode is introduced first and then the principle of PSCC covering both hardware requirement and software programming is described in detail. The analysis made indicated that with this mode, the chopping frequency in winding can reach 20 kHz with 10 kHz power switches and the control frequency can reach 40 kHz at the same time. Subsequently, based on the linear and nonlinear mathematical models of the switched reluctance motor (SRM), some simulation work has been done. The simulation results show that when this mode is applied to SRM drive (SRD) system, the current waveform becomes better. So the ripple of the torque is reduced simultaneously and the vibration and acoustic noise are reduced involuntarily. Stationary tests show that the acoustic noise is greatly diminished. Finally, some experiments were made using a 50 kW SRD system for electric vehicle (EV). Experimental results indicate that this mode can be implemented feasibly and it has a good action on the SRD system.展开更多
基金supported by National Natural Science Foundation of China (No.51577124)the Key Technologies Research and Develop Program of Tianjin (No.15ZCZDGX00980)Tianjin Research Program of Application Foundation and Advanced Technology (No.15JCZDJC32100)
文摘The dynamic model for a bidirectional driven float-type wave power generation system design is presented in this paper.The gravity,buoyancy and drag force acting on the wave energy converter(WEC)are all analyzed.The analytical expression of the torque applied on the rotor is given based on a linear model of the switched reluctance generator(SRG).The SRG usually rotates with low velocity in the WEC system.In this situation,current chopping control(CCC)is adopted with fixed turn-on angle and turn-off angle control mode to have a quick response for SRG.Further,in order to make the float keep in phase with the wave so as to improve the power generation efficiency,the reference current is dynamically adjusted according to the wave motion at all working stages.Then maximum power point tracking(MPPT)of system is achieved.A simulation model is developed in MATLAB for the bidirectional driven float-type wave power generation system with real wave statistical characteristics taken into account.Simulation results show that the WEC can output desired torque periodically with high efficiency and good adaptability.Therefore,the feasibility of applying a SRG in a WEC is also verified.
文摘A novel current chopping mode was used in a switched reluctance motor drive system to make full use of the characteristics of digital signal processor (DSP) TMS320F240. The necessity of this 180° phase-shift current control (PSCC) mode is introduced first and then the principle of PSCC covering both hardware requirement and software programming is described in detail. The analysis made indicated that with this mode, the chopping frequency in winding can reach 20 kHz with 10 kHz power switches and the control frequency can reach 40 kHz at the same time. Subsequently, based on the linear and nonlinear mathematical models of the switched reluctance motor (SRM), some simulation work has been done. The simulation results show that when this mode is applied to SRM drive (SRD) system, the current waveform becomes better. So the ripple of the torque is reduced simultaneously and the vibration and acoustic noise are reduced involuntarily. Stationary tests show that the acoustic noise is greatly diminished. Finally, some experiments were made using a 50 kW SRD system for electric vehicle (EV). Experimental results indicate that this mode can be implemented feasibly and it has a good action on the SRD system.
