scholarly journals On the Flexible Operation of Supercritical Circulating Fluidized Bed: Burning Carbon Based Decentralized Active Disturbance Rejection Control

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1132 ◽  
Author(s):  
Fan Zhang ◽  
Yali Xue ◽  
Donghai Li ◽  
Zhenlong Wu ◽  
Ting He
Keyword(s):  
Power Systems ◽  
Fluidized Bed ◽  
Disturbance Rejection ◽  
High Efficiency ◽  
Circulating Fluidized Bed ◽  
Strong Nonlinearity ◽  
Active Disturbance Rejection Control ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control ◽  
Carbon Based

Supercritical circulating fluidized bed (CFB) is one of the prominent clean coal technologies owing to the advantages of high efficiency, fuel flexibility, and low cost of emission control. The fast and flexible load-tracking performance of the supercritical CFB boiler-turbine unit presents a promising prospect in facilitating the sustainability of the power systems. However, features such as large inertia, strong nonlinearity, and multivariable coupling make it a challenging task to harmonize the boiler’s slow dynamics with the turbine’s fast dynamics. To improve the operational flexibility of the supercritical CFB unit, a burning carbon based decentralized active disturbance rejection control is proposed. Since burning carbon in the furnace responds faster than throttle steam pressure when the fuel flow rate changes, it is utilized to compensate the dynamics of the corresponding loop. The parameters of the controllers are tuned by optimizing the weighted integrated absolute error index of each loop via genetic algorithm. Simulations of the proposed method on a 600 MW supercritical CFB unit verify the merits of load following and disturbance rejection in terms of less settling time and overshoot.

Modified active disturbance rejection control for fluidized bed combustor

2020 ◽  
Vol 102 ◽  
pp. 135-153 ◽  
Author(s):  
Zhenlong Wu ◽  
Donghai Li ◽  
Yali Xue ◽  
Liming Sun ◽  
Ting He ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Disturbance Rejection ◽  
Active Disturbance Rejection Control ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control ◽  
Fluidized Bed Combustor

An Industrial Quadrotor UAV Control Method Based on Fuzzy Adaptive Linear Active Disturbance Rejection Control

Electronics ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 376
Author(s):  
Changhao Sun ◽  
Mengqi Liu ◽  
Chang’an Liu ◽  
Xueling Feng ◽  
Hua Wu
Keyword(s):  
Strong Coupling ◽  
Disturbance Rejection ◽  
High Efficiency ◽  
Control Method ◽  
Fuzzy Controller ◽  
Response Speed ◽  
Active Disturbance Rejection Control ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control ◽  
Fuzzy Adaptive

In this paper, a fuzzy adaptive linear active disturbance rejection control (Fuzzy-LADRC) is proposed for strong coupling and nonlinear quadrotor unmanned aerial vehicle (UAV). At present, UAV conveys new opportunities in the industry, such as power line inspection, petroleum conduit patrolling, and defects detection for the wind turbine, because of its advantages in flexibility, high efficiency, and economy. Usually, the scene of the UAV mission has a high risk, and there are internal sensor noise and unknown external disturbance. Thus, the attitude stability and anti-interference ability of UAV are especially essential. To solve the strong coupling problem of UAV, the dynamics model of UAV is established via the Newton-Euler method, and the coupling part of dynamics is modeled as an internal disturbance. According to the function of linear active disturbance rejection control (LADRC) parameters, a Fuzzy-LADRC is proposed to improve the dynamic performance of the system. The proposed control method makes full use of the adaptive ability of the fuzzy controller and the anti-interference ability of LADRC to the nonlinear and strong coupling systems. As we know, this is the first time that Fuzzy-LADRC has been used in UAV control. In the simulation, the performance indicators of four controllers, including Fuzzy-LADRC, LADRC, PID, and Fuzzy-PID are compared and analyzed. The results indicate that the average response speed of Fuzzy-LADRC is 12.65% faster than LADRC, and it is 29.25% faster than PID. The average overshoot of Fuzzy-LADRC is 17% less than LADRC and 77.75% less than PID. The proposed control method can significantly improve the response speed and anti-interference ability of UAV.

scholarly journals Adaptive Fuzzy Active-Disturbance Rejection Control-Based Reconfiguration Controller Design for Aircraft Anti-Skid Braking System

Actuators ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 201
Author(s):  
Zhao Zhang ◽  
Zhong Yang ◽  
Guoxing Zhou ◽  
Shuchang Liu ◽  
Dongsheng Zhou ◽  
...  
Keyword(s):  
Disturbance Rejection ◽  
Controller Design ◽  
External Disturbance ◽  
Strong Nonlinearity ◽  
Active Disturbance Rejection Control ◽  
Adaptive Fuzzy ◽  
Braking System ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control ◽  
Reconfiguration Controller

The aircraft anti-skid braking system (AABS) is an essential aero electromechanical system to ensure safe take-off, landing, and taxiing of aircraft. In addition to the strong nonlinearity, strong coupling, and time-varying parameters in aircraft dynamics, the faults of actuators, sensors, and other components can also seriously affect the safety and reliability of AABS. In this paper, a reconfiguration controller-based adaptive fuzzy active-disturbance rejection control (AFADRC) is proposed for AABS to meet increased performance demands in fault-perturbed conditions as well as those concerning reliability and safety requirements. The developed controller takes component faults, external disturbance, and measurement noise as the total perturbations, which are estimated by an adaptive extended state observer (AESO). The nonlinear state error feedback (NLSEF) combined with fuzzy logic can compensate for the adverse effects and ensure that the faulty AABS maintains acceptable performance. Numerical simulations are carried out in different runway environments. The results validate the robustness and reconfiguration control capability of the proposed method, which improves AABS safety as well as braking efficiency.

scholarly journals Active Disturbance Rejection Control Scheme for Reducing Mutual Current and Harmonics in Multi-Parallel Grid-Connected Inverters

Energies ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 4363 ◽  
Author(s):  
Muhammad Saleem ◽  
Byoung-Sun Ko ◽  
Si-Hwan Kim ◽  
Sang-il Kim ◽  
Bhawani Chowdhry ◽  
...  
Keyword(s):  
Power Systems ◽  
Disturbance Rejection ◽  
Renewable Energy Sources ◽  
Harmonic Distortion ◽  
Active Disturbance Rejection Control ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control ◽  
Exogenous Disturbance ◽  
Control Scheme ◽  
Hardware In Loop

With the increasing penetration of renewable energy sources into modern power systems, parallel inverters with LCL filters are commonly employed in the grid interface, giving rise to potential resonance problems. Among the different resonances, interactive resonance is triggered by interaction among inverters when different current references are applied to parallel inverters. It may also feature a mutual current that circulates among inverters instead of flowing into the grid and introduces harmonics or instability in the control system. In this paper, active disturbance rejection control based on a reduced-order extended state observer (RESO) was proposed for parallel inverters. With the proposed scheme, the interaction between inverters is considered as an exogenous disturbance caused by other parallel inverters, estimated by the RESO, and rejected by the controller. In the results, the mutual current and interactive harmonics, calculated via fast Fourier transform, were reduced with the proposed control scheme. Thus, the lower total harmonic distortion of each current was achieved. Additionally, the robust stability and less model-dependent control design are the other additive advantages over the derivative filtered capacitor voltage feedforward-based active damping using PI control. The simulation and real-time experimental results of the conventional and proposed scheme, obtained using the hardware-in-loop, were presented to verify the theoretical analysis under the similar and different current reference cases.

scholarly journals Rapid attitude maneuver of the space tether net capture system using active disturbance rejection control

2019 ◽  
Vol 10 (2) ◽  
pp. 575-587
Author(s):  
Cheng Wei ◽  
Hao Liu ◽  
Chunlin Tan ◽  
Yongjian Liu ◽  
Yang Zhao
Keyword(s):  
Disturbance Rejection ◽  
Controller Design ◽  
Strong Nonlinearity ◽  
Active Disturbance Rejection Control ◽  
Control Performance ◽  
Space Tether ◽  
Flexible System ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control ◽  
Attitude Maneuver

Abstract. The space tether net capture system is a spacecraft system with a mounting tether net for capturing targets. It has the advantages of reusability and the adaptability to capture varying targets with different geometries or flying-motion statuses. However, due to its flexible tether net, the system shows strong nonlinearity, which makes it difficult to achieve the desired control performance for rapid and accurate maneuvering; moreover, this limits the ability of the tether net system to capture fast-moving targets. This paper focused on the maneuver controller design of the space capture system with a large flexible tether net. Firstly, based on the absolute node coordinate method, the dynamic model of the space tether net system is established, which can accurately describe the geometric and material nonlinearities of the space tether net. Then, a two-loop active disturbance rejection control is proposed for the rapid and high-precision maneuvering of the flexible system; meanwhile the second-order extended state observer is designed to estimate and compensate for the tether net vibration disturbance. The simulation validated the proposed control, which could complete the rapid and accurate maneuvering and also compensate for the disturbance caused by the vibration of the flexible tether net.

Load Frequency Control of Hybrid Power Systems via Active Disturbance Rejection Control (ADRC)

2013 ◽  
Vol 325-326 ◽  
pp. 1145-1151 ◽  
Author(s):  
Qiao Li Guo ◽  
Wen Tan
Keyword(s):  
Power Systems ◽  
Disturbance Rejection ◽  
Frequency Control ◽  
Load Frequency Control ◽  
Active Disturbance Rejection Control ◽  
Hybrid Power ◽  
Load Frequency ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control ◽  
Frequency Controller

This paper studies the load frequency control (LFC) problem for hybrid power system (HPS) with renewable energy technology. The goal is to attenuate the frequency deviation due to changing load demand, fluctuating wind and varying solar radiation. Two typical HPSs are considered in the paper: one with abundant wind energy and the other with solar energy. Active disturbance rejection control (ADRC) method is used to design the load frequency controller. Simulation results show that ADRC provides higher reliability and stability for the studied HPSs than conventional PI control.

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