A decoupling schemes used in field oriented control for frequency conversion hydraulic timing system
A decoupling schemes used in field oriented control for frequency conversion hydraulic timing system
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发表时间：
2005
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通讯作者：
Shi Shengxian
中科院分区：
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作者：
Shi Shengxian
通过改变液压泵的驱动器交流电机的转速，可以改变液压泵的转速。建立了数学模型和仿真模型，设计了三种PI控制器，并进行了理论分析和计算机仿真分析。同时分析了液压系统主要参数对变频调速系统动态特性的影响。仿真结果表明：解耦控制策略是令人满意的。液压马达的调节时间为0.5s，超调量小于10%。调节阀的容积变化对系统的动态特性有很大的影响。随着阀门容积的增大，系统的调节时间延长，超调次数和喘振次数增加。随着液压元件泄漏系数的增大，系统的调节时间延长。负载变化对系统性能影响不大。
By changing the speed of AC motor, i.e. the driver of hydraulic pump, the speed of hydraulic pump can be changed. The mathematic model and simulation model were founded, three PI controllers were designed; theory analysis and computer simulation analysis were carried out. At the same time, the impact of main parameters of hydraulic system on the dynamic characteristics of variable frequency hydraulic timing system was analyzed. From the simulation, it can be concluded: The decoupling control strategy is satisfying. The adjustable time of hydraulic motor is 0.5s, and the overshooting is less than 10%. The variation of the volume of control valve has a great effect on system dynamic characteristics. The adjustable time of system will be prolonged, the overshooting and surge times increases with the increase of the volume of valve. Adjustable time of the system is prolonged with the increase of leakage coefficient of hydraulic components. Variation of load has little effect on the system performance.