Electro-hydraulic Position Control System Via Active Disturbance Rejection Controller Supplied with Oil by Variable-pressure Accumulators

2019 ◽  
Author(s):  
Dingxuan Zhao ◽  
Fanliang Meng ◽  
Lixin Wang ◽  
Shan Yao ◽  
Lingyu Meng ◽  
...  
Keyword(s):  
Control System ◽  
Disturbance Rejection ◽  
Position Control ◽  
Variable Pressure ◽  
Active Disturbance Rejection ◽  
Position Control System

Active Disturbance Rejection Control for Hydraulic Position Control System of High-Quality Cold Rolling Mill

2012 ◽  
Vol 572 ◽  
pp. 114-119
Author(s):  
Xiao Fei Xiang ◽  
Zhe Wang ◽  
Fei Zhang ◽  
Li Zhao
Keyword(s):  
Control System ◽  
Cold Rolling ◽  
Disturbance Rejection ◽  
Rolling Mill ◽  
Position Control ◽  
Tracking System ◽  
Cold Rolling Mill ◽  
Stability Margins ◽  
Active Disturbance Rejection ◽  
Position Control System

Active disturbance rejection controller (ADRC) instead of the conventional PID controller in the hydraulic position control system is proposed to satisfy high accuracy and speed requirements in cold rolling mill. Based on the simplified model, frequency-domain analysis of the two kinds of controllers is performed. The results show that ADRC produces better performances, such as bandwidth, stability margins. Because of the extended state observer (ESO) that can estimate and compensate the tracking system in real time, ADRC reduces the dependence on accurate mathematical model, improves anti-disturbance capability of the system, and maintains good dynamic characteristics. The simulation results verified the effect of the conclusion.

Simulation of Control System for Permanent Magnet Synchronous Machine

2011 ◽  
Vol 66-68 ◽  
pp. 1422-1427
Author(s):  
Ting You ◽  
Pei Jiang Li
Keyword(s):  
Control System ◽  
Sliding Mode Control ◽  
Permanent Magnet ◽  
Disturbance Rejection ◽  
Sliding Mode ◽  
Synchronous Machine ◽  
Permanent Magnet Synchronous Machine ◽  
Mode Control ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control

For optimal control of synchronous machine, chattering phenomenon will appear if traditional slider control is adopted because permanent magnet synchronous machine is a complex nonlinear time-dependent system with strong coupling of current and rotational speed to cause the deterioration of system control performance with load or load disturbance. In this article, based on the mathematical model of permanent magnet synchronous machine, a control system for it, which combines sliding mode control and active disturbance rejection control, is proposed to improve the dynamic performance and robustness of control system. In the control system, sliding mode control is adopted to control the inner current of machine and active disturbance rejection control is adopted to control the outer speed. The load disturbance of system is also estimated and offset. The results of matlab simulation show that the control system can eliminate serious chattering phenomenon existing in sliding mode control, improves the robustness of system for load and system parameter disturbance as well as has great dynamic and static performance.

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