scholarly journals Robust pole placement and random disturbance rejection for linear polytopic systems with application to grid-connected converters

2021 ◽  
Author(s):  
A.A. Belov
Keyword(s):  
Disturbance Rejection ◽  
Pole Placement ◽  
Random Disturbance ◽  
Polytopic Systems ◽  
Grid Connected Converters

Frequency-domain conditions for disturbance rejection and decoupling with stability or pole placement

Automatica ◽  
1996 ◽  
Vol 32 (2) ◽  
pp. 229-234 ◽  
Author(s):  
Trifon G. Koussiouris ◽  
Konstantinos G. Tzierakis
Keyword(s):  
Frequency Domain ◽  
Disturbance Rejection ◽  
Pole Placement

scholarly journals Improved Active Disturbance Rejection Control of Dual-Axis Servo Tracking Turntable with Friction Observer

Electronics ◽  
2021 ◽  
Vol 10 (16) ◽  
pp. 2012
Author(s):  
Qian Zhang ◽  
Xu Wu ◽  
Qunjing Wang ◽  
Dijiang Chen ◽  
Chao Ye
Keyword(s):  
Disturbance Rejection ◽  
Fuzzy Controller ◽  
Tracking System ◽  
Estimation Error ◽  
Pole Placement ◽  
Active Disturbance Rejection Control ◽  
Factors Affecting ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control ◽  
Servo Tracking

Friction nonlinear disturbance is one of the main factors affecting the control performance of servo tracking system. In this paper, an improved Active Disturbance Rejection Control (ADRC) scheme of dual-axis servo turntable is researched to achieve accurate tracking. Firstly, the mathematical dynamics model of dual-axis servo tracking turntable system is established. The Elastoplastic model is used to describe nonlinear friction, in which the immeasurable part is extended to be a new state. Secondly, considering the smooth and monotonic increasing property of hyperbolic tangent function, an improved tracking differentiator is introduced, which can provide better noise attenuation performance. Thirdly, based on adjustable parameter systematic pole placement method, the fuzzy control algorithm is applied to realize the intelligent tuning of the improved Extended State Observer (ESO) gains, in which the input of the fuzzy controller is the estimation error, while the output is the observer bandwidth. Finally, the improved ADRC system is transformed into a Lurie system, then the extended circle criteria are adopted to analyze the absolute stability of the proposed system. Simulation and experimental verification of the improved ADRC method for the dual-axis turntable tracking servo system are conducted. Results illustrate the effectiveness and robustness of the proposed controller.

A Dual-Loop Current Control Structure With Improved Disturbance Rejection for Grid-Connected Converters

2019 ◽  
Vol 34 (10) ◽  
pp. 10233-10244 ◽  
Author(s):  
Srinivas Gulur ◽  
Vishnu Mahadeva Iyer ◽  
Subhashish Bhattacharya
Keyword(s):  
Disturbance Rejection ◽  
Control Structure ◽  
Current Control ◽  
Loop Current ◽  
Grid Connected Converters

Study on Dynamic Performance of Linear Direct Drive Based on Pole Placement

2012 ◽  
Vol 215-216 ◽  
pp. 926-929 ◽  
Author(s):  
Chao Pan ◽  
Jian Min Zuo ◽  
Mu Lan Wang
Keyword(s):  
Theoretical Analysis ◽  
Disturbance Rejection ◽  
Machine Tools ◽  
Dynamic Performance ◽  
Parameter Variation ◽  
Pole Placement ◽  
Direct Drive ◽  
Synchronous Motors ◽  
Linear Synchronous Motors ◽  
Force Ripple

Permanent magnet linear synchronous motors (PMLSM) can serve as direct drive actuators for machine tools. However, PMLSM is more easily affected by load disturbance, force ripple and parameter variation. As a result, the design of an appropriate controller and research on dynamic performance are very important for PMLSM. In this paper, a feedback controller based on pole-placement is proposed to achieve desired tracking performance. The effectiveness and feasibility of the proposed method are demonstrated through theoretical analysis. The dynamic response and disturbance rejection ability for linear servo system were researched and the parameters which influence the dynamic performance of the system were discussed.

scholarly journals State-PID Feedback for Pole Placement of LTI Systems

2011 ◽  
Vol 2011 ◽  
pp. 1-20 ◽  
Author(s):  
Sarawut Sujitjorn ◽  
Witchupong Wiboonjaroen
Keyword(s):  
Dynamical Systems ◽  
Disturbance Rejection ◽  
State Feedback ◽  
Eigenvalue Problems ◽  
Pole Placement ◽  
Numerical Examples ◽  
Inverse Eigenvalue Problems ◽  
Lti System ◽  
Inverse Eigenvalue ◽  
Single Input

Pole placement problems are especially important for disturbance rejection and stabilization of dynamical systems and regarded as algebraic inverse eigenvalue problems. In this paper, we propose gain formulae of state feedback through PID-elements to achieve desired pole placement for a delay-free LTI system with single input. Real and complex stable poles can be assigned with the proposed compact gain formulae. Numerical examples show that our proposed gain formulae can be used effectively resulting in very satisfactory responses.

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