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Computational simulation and experimental research on speed control of VVVF hydraulic elevator

机译：变频调速液压电梯速度控制的计算仿真与实验研究

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This paper discusses and analyses the speed control of variable voltage variable frequency (VVVF) hydraulic elevator. The computational models of the control system are established. Numerical simulations are carried out with the SIMULINK of MATLAB. PID control law is adopted in experiments because the PID control algorithm is simple in operation, and is characteristic of good computer real-time control. It also possesses good adaptability when the parameters of the controlled object are changed. Experiments are also carried out for the upward and downward running speed of the VVVF hydraulic elevator. Computational simulations coincide with experimental results in general. The results of both simulations and experiments show that serious flutter occurs at the start-up of the VVVF hydraulic elevator, and there is an oscillating phenomenon in the system. During the start-up of the VVVF hydraulic elevator, the system absorbs elastic energy when static friction is changed to dynamic friction. This results in the oscillations after starting.
机译：本文讨论并分析了可变电压变频（VVVF）液压电梯的速度控制。建立了控制系统的计算模型。使用MATLAB的SIMULINK进行数值模拟。由于PID控制算法操作简单，具有良好的计算机实时控制特性，因此在实验中采用了PID控制律。改变被控对象的参数时，也具有很好的适应性。还对VVVF液压升降机的向上和向下运行速度进行了实验。通常，计算模拟与实验结果一致。仿真和实验结果均表明，在VVVF液压电梯启动时会发生严重的颤动，并且系统中会出现振荡现象。在VVVF液压升降机启动期间，当静摩擦力变为动摩擦力时，系统会吸收弹性能。这导致启动后产生振荡。

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