To solve the problem of harmonic pollution to the power grid that caused by traditional diode rectifier and phase controlled rectifier, the unit power factor PWM rectifier is designed. The topology structure of the re...To solve the problem of harmonic pollution to the power grid that caused by traditional diode rectifier and phase controlled rectifier, the unit power factor PWM rectifier is designed. The topology structure of the rectifier circuit is introduced and the double closed-loop control strategy in three-phase stationary coordinate system is analyzed. For the deficiency of control strategy, the control strategy in two-phase synchronous rotating coordinate system is proposed. This makes the independent control of active current and reactive current to be realized. The simulation model of the PWM rectifier is built and the effectiveness of the control method proposed in this paper is verified by simulation.展开更多
为实现四旋翼飞行器稳定可靠性飞行控制,提出了以ATMEL公司AVR微控制器为核心IC(IntergratedCircuit)的MCU(Micro Control Unit)四旋翼飞行器控制系统。该系统由以无刷直流电机为动力核心的动力驱动系统、以微控制器及陀螺仪为核心的核...为实现四旋翼飞行器稳定可靠性飞行控制,提出了以ATMEL公司AVR微控制器为核心IC(IntergratedCircuit)的MCU(Micro Control Unit)四旋翼飞行器控制系统。该系统由以无刷直流电机为动力核心的动力驱动系统、以微控制器及陀螺仪为核心的核心控制系统、以2.4 GHz的无线遥控接收器为核心的无线遥控控制系统组成。采用脉冲宽度调制(PWM:Pulse Width Modulation)信号控制四旋翼控制动力驱动模块。通过对四旋翼工作模式与控制参数的研究,得到相应的控制算法,然后编程实现、模拟相应的飞行姿态。实验结果表明,四旋翼飞行器能稳定悬停、转向和三维控制。展开更多
文摘To solve the problem of harmonic pollution to the power grid that caused by traditional diode rectifier and phase controlled rectifier, the unit power factor PWM rectifier is designed. The topology structure of the rectifier circuit is introduced and the double closed-loop control strategy in three-phase stationary coordinate system is analyzed. For the deficiency of control strategy, the control strategy in two-phase synchronous rotating coordinate system is proposed. This makes the independent control of active current and reactive current to be realized. The simulation model of the PWM rectifier is built and the effectiveness of the control method proposed in this paper is verified by simulation.
