Disturbance Attenuation Using Proportional-Integral-Observer for Wind Turbine Speed Regulation

2014 ◽  
Author(s):  
Jackson G. Njiri ◽  
Yan Liu ◽  
Dirk Söffker
Keyword(s):  
Disturbance Rejection ◽  
High Gain ◽  
Disturbance Attenuation ◽  
Control Performance ◽  
Proportional Integral ◽  
Speed Regulation ◽  
Power Regulation ◽  
System States ◽  
Turbine Speed ◽  
Estimate System

In this paper high-gain Proportional-Integral-Observer (PI-Observer) is used to estimate system states and wind disturbances. To guarantee the robustness and the desired performance, a disturbance rejection scheme is employed to compensate these disturbances. The proposed method realizes speed/power regulation during high wind regime. Control performance of the proposed scheme is evaluated against a baseline collective pitch controller (CPC). The results show that the proposed method can maintain fairly constant power/rotor speed without inducing extra load on the rotor.

Disturbance Observer Based Control Design for Wind Turbine Speed Regulation

2016 ◽  
Author(s):  
Yuan Yuan ◽  
Xu Chen ◽  
Jiong Tang
Keyword(s):  
Wind Turbine ◽  
Pid Controller ◽  
Disturbance Observer ◽  
Control Loop ◽  
Wind Fields ◽  
Model Mismatch ◽  
Model Based ◽  
Speed Regulation ◽  
Power Regulation ◽  
Turbine Speed

Disturbance observer based (DOB) control has been implemented in motion control to reject unknown or time-varying disturbances. In this research, an internal model-based disturbance observer (DOB) design combined with a PID type feedback controller is formulated for wind turbine speed and power regulation. The DOB controller facilitates model-based estimation and cancellation of disturbance using an inner feedback control loop. The disturbance observer combined with a compensator is further designed to deal with the model mismatch. The proposed method is applied to National Renewable Energy laboratory (NREL) offshore 5-MW wind turbine. Our case studies show that the DOB controller can achieve improved speed and power regulation compared to the baseline PID controller, and exhibit excellent robustness under different turbulent wind fields.

Stabilization of a class of switched uncertain systems by active disturbance rejection control

2018 ◽  
Vol 40 (16) ◽  
pp. 4421-4431 ◽  
Author(s):  
Chen Liu ◽  
Chaoyang Dong ◽  
Qing Wang ◽  
Maopeng Ran
Keyword(s):  
Disturbance Rejection ◽  
External Disturbance ◽  
Average Dwell Time ◽  
Feedback System ◽  
Active Disturbance Rejection Control ◽  
Extended State ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control ◽  
System States ◽  
Estimate System

The problem of stabilization for a class of switched uncertain non-linear systems is studied by active disturbance rejection control (ADRC). Coordinate transformation is applied to transform the system into a strict feedback system in normal form. The unknown non-linearity, parameter uncertainty and external disturbance are treated as an extended state of each subsystem, and a corresponding switched extended state observer (ESO) is designed. Based on the output of the switched ESO, a switching ADRC law is proposed. Rigorous proof is given to show that the switched ESO can estimate system states and the unknown non-linearity of each subsystem effectively. Furthermore, the proposed controller guarantees the closed-loop system be semi-globally uniformly ultimately bounded for a class of switching with average dwell time. A numerical example illustrates the effectiveness of the proposed method.

The proportional-integral controller design based on a Smith-like predictor for a class of high order systems

2020 ◽  
pp. 014233122094462
Author(s):  
Zhenlong Wu ◽  
Jie Yuan ◽  
Donghai Li ◽  
Yali Xue ◽  
YangQuan Chen
Keyword(s):  
Disturbance Rejection ◽  
Control Structure ◽  
Controller Design ◽  
High Order ◽  
Industrial Processes ◽  
Thermal Processes ◽  
Control Performance ◽  
Proportional Integral ◽  
Integral Controller ◽  
Proportional Integral Controller

Heat transfer and fluid flow play important roles in industrial processes, especially in chemical and thermal processes. Their dynamics are often modelled as high order systems with the type of [Formula: see text], which have slow responses to the set point and the input disturbance. To enhance the tracking and disturbance rejection performance of these systems, a control structure combining the proportional-integral (PI) controller and Smith-like predictor is proposed in this paper. The tracking and disturbance rejection performance of the proposed control structure with the order mismatch are analyzed. In addition, the precondition where the proposed control structure can obtain satisfactory disturbance rejection performance is deduced. By analyzing the influence of PI parameters on control performance, an empirical tuning rule, which can balance the control performance and robustness constraint well, is summarized and the corresponding tuning toolbox is developed. Finally, the superiority of the proposed control structure is verified by simulations and comparative experiments based on Peltier temperature control platform.

Composite disturbance rejection control for hydraulic classification

2017 ◽  
Vol 40 (6) ◽  
pp. 1863-1872
Author(s):  
Dan Niu ◽  
Xisong Chen ◽  
Xiaojun Wang ◽  
Xingpeng Zhou
Keyword(s):  
Disturbance Rejection ◽  
Disturbance Observer ◽  
Control Strategies ◽  
Water Pressure ◽  
Feedback Regulation ◽  
Disturbance Attenuation ◽  
Proportional Integral Derivative ◽  
Large Coupling ◽  
Proportional Integral ◽  
Hydraulic Classification

In the hydraulic classification, precise control for the flow rate of overflow water is vital to guarantee the uniformity and stability of the powder product size. Usually the multiple overflow tanks are supplied by a shared overflow pipeline, which gives rise to large coupling effects in the controls for the flow rates of multiple overflow tanks simultaneously. To solve this issue, it is necessary to keep the water pressure in the shared overflow pipeline accurately constant, which is not easy due to strong disturbances. Several control strategies have been proposed to control the constant water pressure. However, most of them (such as proportional-integral-derivative and model predictive control) reject disturbances just through feedback regulation and do not reject disturbances directly. This may cause poor control performances in the presence of strong disturbances. For improving the disturbance rejection performance, a control scheme based on proportional-integral-derivatives and disturbance observer is put forward in this paper. The scheme employs disturbance observer as feedforward compensation and a proportional-integral-derivative controller as feedback regulation. The disturbance rejection properties under both model mismatches and external disturbances are discussed. The test results illustrate that the proposed method can remarkably improve the disturbance attenuation property compared with the conventional proportional-integral-derivative method in the hydraulic classification process.

scholarly journals Investigating On-Road Lane Maintenance and Speed Regulation in Post-Stroke Driving: A Pilot Case–Control Study

Geriatrics ◽  
2021 ◽  
Vol 6 (1) ◽  
pp. 16
Author(s):  
Heng Zhou ◽  
Qian (Chayn) Sun ◽  
Alison Blane ◽  
Brett Hughes ◽  
Torbjörn Falkmer ◽  
...  
Keyword(s):  
Cognitive Abilities ◽  
Speed Control ◽  
Executive Dysfunction ◽  
Case Control ◽  
Older Drivers ◽  
Control Performance ◽  
Post Stroke ◽  
Speed Regulation ◽  
Stroke Population ◽  
Lane Keeping

Stroke can adversely affect the coordination and judgement of drivers due to executive dysfunction, which is relatively common in the post-stroke population but often undetected. Quantitatively examining vehicle control performance in post-stroke driving becomes essential to inspect whether and where post-stroke older drivers are risky. To date, it is unclear as to which indicators, such as lane keeping or speed control, can differentiate the driving performance of post-stroke older drivers from that of normal (neurotypical) older drivers. By employing a case–control design using advanced vehicle movement tracking and analysis technology, this pilot study aimed to compare the variations in driving trajectory, lane keeping and speed control between the two groups of older drivers using spatial and statistical techniques. The results showed that the mean standard deviation of lane deviation (SDLD) in post-stroke participants was higher than that of normal participants in complex driving tasks (U-turn and left turn) but almost the same in simple driving tasks (straight line sections). No statistically significant differences were found in the speed control performance. The findings indicate that, although older drivers can still drive as they need to after a stroke, the decline in cognitive abilities still imposes a higher cognitive workload and more effort for post-stroke older drivers. Future studies can investigate post-stroke adults’ driving behaviour at more challenging driving scenarios or design driving intervention programs to improve their executive function in driving.

A novel fractional order PID plus derivative (PIλDµDµ2) controller for AVR system using equilibrium optimizer

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Abdulsamed Tabak
Keyword(s):  
Fractional Order ◽  
Transient Response ◽  
Superior Performance ◽  
Control Performance ◽  
Proportional Integral Derivative ◽  
Content Type ◽  
Proportional Integral ◽  
Avr System ◽  
Optimization Parameters ◽  
Fractional Order Pid

Purpose The purpose of this paper is to improve transient response and dynamic performance of automatic voltage regulator (AVR). Design/methodology/approach This paper proposes a novel fractional order proportional–integral–derivative plus derivative (PIλDµDµ2) controller called FOPIDD for AVR system. The FOPIDD controller has seven optimization parameters and the equilibrium optimizer algorithm is used for tuning of controller parameters. The utilized objective function is widely preferred in AVR systems and consists of transient response characteristics. Findings In this study, results of AVR system controlled by FOPIDD is compared with results of proportional–integral–derivative (PID), proportional–integral–derivative acceleration, PID plus second order derivative and fractional order PID controllers. FOPIDD outperforms compared controllers in terms of transient response criteria such as settling time, rise time and overshoot. Then, the frequency domain analysis is performed for the AVR system with FOPIDD controller, and the results are found satisfactory. In addition, robustness test is realized for evaluating performance of FOPIDD controller in perturbed system parameters. In robustness test, FOPIDD controller shows superior control performance. Originality/value The FOPIDD controller is introduced for the first time to improve the control performance of the AVR system. The proposed FOPIDD controller has shown superior performance on AVR systems because of having seven optimization parameters and being fractional order based.

scholarly journals Active Disturbance Rejection Control Design Using the Optimization Algorithm for a Hydraulic Quadruped Robot

2021 ◽  
Vol 2021 ◽  
pp. 1-22
Author(s):  
Yuqi Fan ◽  
Junpeng Shao ◽  
Guitao Sun ◽  
Xuan Shao
Keyword(s):  
Disturbance Rejection ◽  
Search Algorithm ◽  
Parameter Tuning ◽  
Quadruped Robot ◽  
Search Problem ◽  
Lévy Flight ◽  
Control Performance ◽  
External Interference ◽  
Levy Flight ◽  
Active Disturbance Rejection

To increase the robustness and control precision of a hydraulic quadruped robot and simultaneously enhance the dynamic and steady characteristic of the hydraulic system, an active disturbance rejection controller (ADRC) tuned using the Lévy-flight beetle antennae search algorithm (LBAS) was proposed. Moreover, the designed controller was used in the hydraulic quadruped robot to enhance the control performance and restrain the disturbances. The use of the Lévy-flight trajectory in the advanced algorithm can help increase the search speed and iteration accuracy. In the LBAS-ADRC, the parameter tuning method is adopted to develop the active disturbance rejection controller enhanced using the beetle antennae search algorithm. When implemented in the hydraulic quadruped robot, the LBAS-ADRC can ensure satisfactory dynamic characteristics and stability in the presence of external interference. In particular, in the proposed method, the ADRC parameter search problem is transformed to a sixteen-dimensional search problem, the solution of which is identified using the Lévy-flight beetle antennae search algorithm. Moreover, three different algorithms are implemented in the active disturbance rejection controller tuning problem to demonstrate the control performance of the proposed controller. The analysis results show that the proposed controller can achieve a small amplitude overshoot under complex and changeable environments.

Disturbance attenuation using proportional integral observers

2001 ◽  
Vol 74 (6) ◽  
pp. 618-627 ◽  
Author(s):  
Krishna K. Busawon ◽  
Pousga Kabore
Keyword(s):  
Disturbance Attenuation ◽  
Proportional Integral
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