A hydraulic position system was designed employing two high speed On/Off solenoid valves with PWM(Pulse width modulation) technique and using LQ(Linear Quadratic) optimization principle. Based on the system, the parts...A hydraulic position system was designed employing two high speed On/Off solenoid valves with PWM(Pulse width modulation) technique and using LQ(Linear Quadratic) optimization principle. Based on the system, the parts of system can be formulated with equations. According to equations, the mathematical model of the system was established. By simulation, the corresponding LQ optimal controller was designed and the PWM signals were generated. The comparison of the simulation and experiment results show that LQ optimal control method with PWM technique employing high speed On/Off solenoid valve can provide better system performance and a high position precision is obtained.展开更多
在综合考虑波形特性、开关损耗、电压利用率及易实现性的基础上,提出一种新的最优移相脉宽调制(PWM)控制策略。从线电压出发,指出电压利用率的提高实质上是一个非线性规划问题,并就此非线性规划问题分8种情况进行讨论,系统地分析了谐波...在综合考虑波形特性、开关损耗、电压利用率及易实现性的基础上,提出一种新的最优移相脉宽调制(PWM)控制策略。从线电压出发,指出电压利用率的提高实质上是一个非线性规划问题,并就此非线性规划问题分8种情况进行讨论,系统地分析了谐波注入正弦脉宽调制(SPWM)电压利用率可以达到的极限值。采用数字仿真得出易于现场可编程门阵列(FPGA)实现的最优移相PWM调制波数据,并对其进行频谱分析。论证了移相法和堆波法在开关损耗上的一致性,以及移相法具有开关动作均匀、易于FPGA实现的特点。最后给出了最优移相PWM策略MATLAB仿真波形以及在SIGA(system in gate array)多电平高压变频器模型机中应用的实验波形。展开更多
文摘A hydraulic position system was designed employing two high speed On/Off solenoid valves with PWM(Pulse width modulation) technique and using LQ(Linear Quadratic) optimization principle. Based on the system, the parts of system can be formulated with equations. According to equations, the mathematical model of the system was established. By simulation, the corresponding LQ optimal controller was designed and the PWM signals were generated. The comparison of the simulation and experiment results show that LQ optimal control method with PWM technique employing high speed On/Off solenoid valve can provide better system performance and a high position precision is obtained.
文摘在综合考虑波形特性、开关损耗、电压利用率及易实现性的基础上,提出一种新的最优移相脉宽调制(PWM)控制策略。从线电压出发,指出电压利用率的提高实质上是一个非线性规划问题,并就此非线性规划问题分8种情况进行讨论,系统地分析了谐波注入正弦脉宽调制(SPWM)电压利用率可以达到的极限值。采用数字仿真得出易于现场可编程门阵列(FPGA)实现的最优移相PWM调制波数据,并对其进行频谱分析。论证了移相法和堆波法在开关损耗上的一致性,以及移相法具有开关动作均匀、易于FPGA实现的特点。最后给出了最优移相PWM策略MATLAB仿真波形以及在SIGA(system in gate array)多电平高压变频器模型机中应用的实验波形。
