scholarly journals Speed Control Based on ESO for the Pitching Axis of Satellite Cameras

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
BingYou Liu ◽  
Yi Jin ◽  
ChangZheng Chen ◽  
HuiCheng Yang
Keyword(s):  
Control System ◽  
Control Strategy ◽  
Input Parameter ◽  
Response Speed ◽  
Parameter Tuning ◽  
Fast Response ◽  
Angular Speed ◽  
Extended State ◽  
External Disturbances ◽  
State Variable

The pitching axis is the main axis of a satellite camera and is used to control the pitch posture of satellite cameras. A control strategy based on extended state observer (ESO) is designed to obtain a fast response speed and highly accurate pitching axis control system and eliminate disturbances during the adjustment of pitch posture. First, a sufficient condition of stabilization for ESO is obtained by analyzing the steady-state error of the system under step input. Parameter tuning and disturbance compensation are performed by ESO. Second, the ESO of speed loop is designed by the speed equation of the pitching axis of satellite cameras. The ESO parameters are obtained by pole assignment. By ESO, the original state variable observes the motor angular speed and the extended state variable observes the load torque. Therefore, the external load disturbances of the control system are estimated in real time. Finally, simulation experiments are performed for the system on the cases of nonload starting, adding external disturbances on the system suddenly, and the load of system changing suddenly. Simulation results show that the control strategy based on ESO has better stability, adaptability, and robustness than the PI control strategy.

Simulation and Analysis of PMSM Based on Space Vector Control Strategy

2013 ◽  
Vol 756-759 ◽  
pp. 472-476
Author(s):  
Gang Zhao ◽  
Nan Zhang
Keyword(s):  
Control System ◽  
Vector Control ◽  
Permanent Magnet ◽  
Control Strategy ◽  
Permanent Magnet Synchronous Motor ◽  
Response Speed ◽  
Fast Response ◽  
Synchronous Motor ◽  
Loop Control ◽  
Vector Control Strategy

Permanent magnet synchronous motor (PMSM) vector control strategy is studied deeply in the paper based on the analysis of the operation principle of permanent magnet synchronous motor (PMSM). Permanent magnet synchronous motor (PMSM) speed-current double closed loop control system was built by Matlab/Simulink. The simulation results showed that the system had fast response speed, high accuracy and strong anti-interference ability and so on. It also proved that Permanent magnet synchronous motor (PMSM) vector control system had good dynamic and static performances.

scholarly journals A New Control Strategy for Bi-directional DC/DC Converter in DC Microgrid

2021 ◽  
Vol 233 ◽  
pp. 01051
Author(s):  
Tianze Miao ◽  
Xiaona Liu ◽  
Siyuan Liu ◽  
Lihua Wang
Keyword(s):  
Steady State ◽  
Control Strategy ◽  
Feedback Linearization ◽  
Sliding Mode ◽  
Response Speed ◽  
Fast Response ◽  
Sliding Mode Controller ◽  
Exponential Approximation ◽  
Dc Microgrid ◽  
Simulation Results

The bi-directional DC / DC converter in DC microgrid is a typical nonlinear system which has large voltage disturbance during lead accumulator charging and discharging. In order to solve the problem of voltage disturbance, the linearization of the converter is realized by exact feedback linearization, and the sliding mode controller is designed by using exponential approximation law. The simulation results show that the method has fast response speed, strong anti-interference ability and good steady-state characteristics.

Control system of the six-axis serial manipulator based on active disturbance rejection control

2020 ◽  
Vol 17 (4) ◽  
pp. 172988142093947
Author(s):  
Xing Li ◽  
Bingyou Liu ◽  
Lichao Wang
Keyword(s):  
Control System ◽  
Control Strategy ◽  
Disturbance Rejection ◽  
State Observer ◽  
Extended State Observer ◽  
Active Disturbance Rejection Control ◽  
Extended State ◽  
Parameter Uncertainties ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control

This study considers the problems of manipulators with high coupling, parameter uncertainties, and external disturbances. A six-axis serial manipulator control system based on active disturbance rejection control strategy is proposed without the requirement of the exact dynamic model. First, the operating circuit of the manipulator joint motor is analyzed, and the mathematical model of the direct-current torque motor is established. Second, the components of active disturbance rejection control are designed, and a new nonlinear function is selected to construct the extended state observer and nonlinear state error feedback control law. Then, Kalman filter is introduced into an extended state observer to estimate the disturbance efficiently. Finally, the proportion–integration–differentiation control, traditional active disturbance rejection control, and improved active disturbance rejection control are simulated and compared under the same input signal. The results show that the proposed control strategy has good dynamic performance and uncertain disturbance robustness, which proves the effectiveness of the proposed method.

Research and Application of Human-Simulated Intelligent Controller

2012 ◽  
Vol 195-196 ◽  
pp. 1142-1146
Author(s):  
Zhi Kui Wang ◽  
Qing Hui Zhu
Keyword(s):  
Control Strategy ◽  
Response Speed ◽  
Parameter Tuning ◽  
System Response ◽  
Programmable Logic ◽  
Industrial Control ◽  
Change Rate ◽  
Intelligent Controller ◽  
Pid Algorithm ◽  
Tuning Process

The principle of human-simulated intelligent controller (HSIC) and the application in industrial control have been discussed. The improved HSIC compensates and consumes the system according to different conditions combined by error and error change rate. Because the parameter tuning of HSIC is completed in programmable logic controller, the control strategy of HSIC is simple than that of PID algorithm and the system response speed is more quickly. The author suggests that the parameters of HSIC should be optimized to decrease the complex degree of parameter tuning process and to reduce system overshoot dramatically.

Analysis on Structure of Active Disturbances Rejection Controller

2013 ◽  
Vol 721 ◽  
pp. 452-455
Author(s):  
Zhao Lin Han ◽  
Huan Ma ◽  
Long Ling Ge
Keyword(s):  
Control System ◽  
Real Time ◽  
External Disturbance ◽  
Error Feedback ◽  
Extended State ◽  
External Disturbances ◽  
Plant Model ◽  
Tracking Differentiator ◽  
Parameter Perturbations ◽  
Nonlinear State

Regarding the Active Disturbances Rejection Controller (ADRC) as main line, this present paper has Introduced Extended State Observer (ESO), Tracking Differentiator (TD), Nonlinear State Error Feedback (NLSEF), which are all the key parts of ADRC, in addition, the realization means and specific structure of ADRC is included. In ADRC control system, it is not necessary to identify the plant model and the form of external disturbance, but taking the unified model parameter perturbations and external disturbances on the system as a system disturbance for real-time compensation, therefor the control system has very good adaptability and robustness.

scholarly journals Application of Repetitive Control and ANFIS-PI Compound Control Strategy in APF

2021 ◽  
Vol 2121 (1) ◽  
pp. 012037
Author(s):  
Mengtao Zhang ◽  
Tao Sui
Keyword(s):  
Control Strategy ◽  
Control Method ◽  
Balance Control ◽  
Dynamic Performance ◽  
Repetitive Control ◽  
Response Speed ◽  
Fast Response ◽  
Application Process ◽  
Actual Application ◽  
Compound Control

Abstract In order to effectively solve a series of problems caused by harmonics in power system, an active power filter based on ANFIS-PI and repetitive control is designed. The traditional single control method cannot balance control accuracy and response speed, so a compound control strategy is adopted. Repetitive control can produce the same output as the harmonic current, so it can achieve zero steady-state error tracking compensation for each harmonic, but its dynamic performance is not good. As a traditional control method, the PI control method has a fast response speed, but in the actual application process, when the load changes suddenly, that is, when the system parameters change, its tracking effect is not ideal. Therefore, a composite control strategy of ANFIS-PI and repeated control is proposed. It has been proved that its compensation accuracy and dynamic response speed have been significantly improved.

A coordinated control law for inlet/outlet independent regulation of electro-hydraulic speed control system under sustained negative load

2020 ◽  
Vol 234 (9) ◽  
pp. 1689-1705
Author(s):  
Wei Liu ◽  
Yunhua Li ◽  
Dong Li
Keyword(s):  
Control System ◽  
Control Strategy ◽  
Tracking Control ◽  
Sliding Mode ◽  
Coordinated Control ◽  
Back Pressure ◽  
Extended State Observer ◽  
Control Law ◽  
Extended State ◽  
Control Subsystem

Negative load operation is an inevitable operating condition for a completed task cycle of electro-hydraulic speed control system. In this working condition, to coordinate both tracking control and speed smooth regulation is necessary for avoiding stall. In this paper, a nonlinear coordinated control law aiming at independent regulation of inlet/outlet oil of valve-controlled electro-hydraulic speed system under sustained negative load is proposed. The overall control system can be divided into position tracking control subsystem and speed smooth control subsystem according to the function of the system operation. First, the coordinated control strategy is designed according to the requirements of speed tracking and speed smoothing. Then, for the coupling control problem existed in the system, a novel control law based on objective acceleration planning and expected back-pressure planning is presented. Furthermore, specified on the problem of uncertain random disturbance in practical applications, the extended state observer is designed, extending the summation of uncertain stochastic disturbance under sustained negative load into a new state variable. Finally, addressing the coordinated control strategy with expected back-pressure planning, we designed nonlinear decoupling control laws by using backstepping sliding mode robust control and backstepping sliding mode control based on extended state observer, respectively. The results of simulation and experiment show that the proposed nonlinear coordinated control strategy can provide the excellent coordination and robust performance for tracking control and speed smooth regulation.

The Modification of Digital Current Following Control Approach of Buck DC-DC Converter

2014 ◽  
Vol 574 ◽  
pp. 628-632
Author(s):  
Hong Li Cheng ◽  
Long Fei Jia
Keyword(s):  
Steady State ◽  
Control Strategy ◽  
Control Strategies ◽  
Sudden Change ◽  
Response Speed ◽  
Fast Response ◽  
State Control ◽  
Control Approach ◽  
Dynamic Performances ◽  
Steady State Control

Current following control Buck DC-DC converter has such advantages as simple control strategy and fast response speed, in this paper, based on the existing control strategy, a detailed research is gave and a mathematical model is established to load sudden change. This improves the existing control strategy. The modified control strategies which can be divided into steady state control strategy and load change control strategy. By Simulation, the results shows that the proposed control strategy is feasible. Ensuring accuracy of output voltage while steady state, the modified control strategy obviously improves the dynamic performances, also shorter recovery time under the condition of the existing hardware parameters.

scholarly journals Adaptive Robust SMC-Based AGC Auxiliary Service Control for ESS-Integrated PV/Wind Station

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Xiao-Ling Su ◽  
Zheng-Kui Zhao ◽  
Yang Si ◽  
Yong-Qing Guo
Keyword(s):  
Power System ◽  
Sliding Mode ◽  
Control Strategies ◽  
Renewable Energy Sources ◽  
Response Speed ◽  
Fast Response ◽  
Automatic Generation ◽  
Voltage Regulation ◽  
System Stability ◽  
External Disturbances

Power source structure has developed significantly because of the increasing share of renewable energy sources (RESs) in the power system. RESs bring inevitable impacts on power system frequency, voltage regulation, and power system stability. The conventional automatic generation control (AGC) loops which relay only on the synchronous generating units cannot meet the requirements of these new circumstances. This paper presents an ESS-integrated PV/wind station topology and its control structure for AGC auxiliary service in order to provide existing RESs the additional functionality of AGC auxiliary service without changing their control strategies conceived for MPPT mode. The shifting operation modes and external disturbances make ESSs in an ESS-integrated PV/wind station inherently nonlinear and time variable. Therefore, an adaptive robust sliding-mode control (ARSMC) system is proposed. The ARSMC colligates the advantages of adaptive control and SMC contains state feedback term, robust control term, and adaptive compensation term. The strictly logical and rigorous proof using Lyapunov stability analysis indicates the ARSMC system is insensitive to parametric uncertainties and external disturbances; meanwhile, it guarantees fast response speed and high control precision. The case studies on NI-PXI platform validate the effectiveness of the proposed approach.

Research on the Application of Proportional Controller Based on Phase Plane Division in the Tension Control System of Coating Device

2014 ◽  
Vol 687-691 ◽  
pp. 121-125
Author(s):  
Lei Zhang ◽  
Si Yun Tan ◽  
Wen Lei Gu
Keyword(s):  
Control System ◽  
Control Strategy ◽  
Phase Plane ◽  
Parameter Tuning ◽  
Tension Control ◽  
Simulation Results ◽  
Tuning Methods ◽  
Tension Control System ◽  
Proportional Controller

The objective of this paper is to research on the application of proportional controller based on phase plane division in the tension control system of coating device to improve the quality of tension control. Firstly, the control strategy of proportional controller based on phase plane division and the parameter tuning methods are analyzed. Then the simulation model of tension control system is built with the help of MATLAB SIMULINK. Finally, the simulation results are given. Simulation results indicate that the tension control system is effectively controlled by the proportional controller based on phase plane division.

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