控制理论与技术（英文版）/Journal Control Theory and TechnologyCSCDEI
查看更多>>“Journal of Control Theory and Applications”(《控制理论与应用》(英文版))是由国家教育部主管、华南理工大学主办的全国性学术刊物。2003年创刊，双月刊、 A4开本，国内外公开发行。本刊主要报道系统控制科学中具有新观念、新思想的理论研究成果及其在各个领域中，特别是高科技领域中的应用研究成果。本刊设置的栏目主要有：论文、短文、书刊评介、国内外学术动态等。读者对象为从事控制理论与应用研究的科技人员，高校师生及其它有关人员。
查看更多>>摘要：This paper focuses on the recent progress in the adoption of active disturbance rejection control(ADRC)in thermal pro-cesses as a viable alternative to proportional-integral-derivative(PID),especially in coal-fired power plants.The profound interpretation of this paradigm shift,with backward compatibility,is discussed in detail.A few fundamental issues associated with ADRC's applications in thermal processes are discussed,such as implementation,tuning,and the structural changes.Examples and case studies are presented,encompassing coal-fired power plants,gas turbines and nuclear power plants,as well as highlighting results of field applications.Also discussed are future research opportunities brought by ADRC's entry as the baseline control technology in thermal processes.
查看更多>>摘要：To support the adoption of active disturbance rejection control(ADRC)in industrial practice,this article aims at improv-ing both understanding and implementation of ADRC using traditional means,in particular via transfer functions and a frequency-domain view.First,to enable an immediate comparability with existing classical control solutions,a realizable transfer function implementation of continous-time linear ADRC is introduced.Second,a frequency-domain analysis of ADRC components,performance,parameter sensitivity,and tuning method is performed.Finally,an exact implementation of discrete-time ADRC using transfer functions is introduced for the first time,with special emphasis on practical aspects such as computational efficiency,low parameter footprint,and windup protection.
查看更多>>摘要：The paper presents a novel control design,which is based on the idea of active disturbance rejection control(ADRC),for a kind of flexible aerocraft whose controlled variable cannot be measured directly.Since the original frame of ADRC can-not be directly applied,the paper puts forward a new extended state observer(ESO)and the corresponding ADRC law.In order to assign the poles of the closed-loop system to ideal positions such that the vibration can be quickly suppressed,an elastic damping term is added into feedback law.The advantages of the new ESO for effectively estimating both the rigid mode and elastic mode from the measurements are discussed.Moreover,the analysis on the stability,the relative stability and the steady state of the closed-loop system is given.Finally,the effectiveness and robustness of the proposed ADRC are verified by simulations.
查看更多>>摘要：An extended state observer(ESO)-based loop filter is designed for the phase-locked loop(PLL)involved in a disturbed grid-connected converter(GcC).This ESO-based design enhances the performances and robustness of the PLL,and,therefore,improves control performances of the disturbed GcCs.Besides,the ESO-based LF can be applied to PLLs with extra filters for abnormal grid conditions.The unbalanced grid is particularly taken into account for the performance analysis.A tuning approach based on the well-designed PI controller is discussed,which results in a fair comparison with conventional PI-type PLLs.The frequency domain properties are quantitatively analysed with respect to the control stability and the noises rejection.The frequency domain analysis and simulation results suggest that the performances of the generated ESO-based controllers are comparable to those of the PI control at low frequency,while have better ability to attenuate high-frequency measurement noises.The phase margin decreases slightly,but remains acceptable.Finally,experimental tests are conducted with a hybrid power hardware-in-the-loop benchmark,in which balanced/unbalanced cases are both explored.The obtained results prove the effectiveness of ESO-based PLLs when applied to the disturbed GcC.
查看更多>>摘要：A pneumatic actuator is a fast and economical tool that converts compressed air into mechanical motion.In this paper,an extended state observer(ESO)-based sliding mode controller(SMC)is developed to adjust the air pressure of the actua-tor for accurate position control.Specifically,an impedance control module is established to produce desired air pressure based on the relationship between forces and desired positions.Then,the ESO-based SMC is implemented to adjust the air pressure to the required level despite the presence of system uncertainties and disturbances.As a result,the position of the actuator is controlled to a setpoint through the regulation of pressure.The performance of ESO-based SMC is compared with that of a classic active disturbance rejection controller(ADRC)and a SMC.Simulation results demonstrate that the ESO-based SMC shows comparable performance to ADRC in terms of precise pressure control.In addition,it requires the least control effort necessary to excite valves among the three controllers.The stability of ESO-based SMC is theoretically justified through Lyapunov approach.
查看更多>>摘要：In this paper,a data-driven method for disturbance estimation and rejection is presented.The proposed approach is divided into two stages:an inner stabilization loop,to set the desired reference model,together with an outer loop for disturbance estimation and compensation.Inspired by the active disturbance rejection control framework,the exogenous and endogenous disturbances are lumped into a total disturbance signal.This signal is estimated using an on-line algorithm based on a data-driven predictor scheme,whose parameters are chosen to satisfy high robustness-performance criteria.The above process is presented as a novel enhancement to design a disturbance observer,which constitutes the main contribution of the paper.In addition,the control strategy is completely presented in discrete time,avoiding the use of discretization methods for its digital implementation.As a case study,the voltage control of a DC-DC synchronous buck converter affected by disturbances in the input voltage and the load is considered.Finally,experimental results that validate the proposed strategy and some comparisons with the classical disturbance observer-based control are presented.
查看更多>>摘要：In this work,the problem of designing a robust control algorithm for a DC-DC buck power converter is investigated.The applied solution is based on a recently proposed error-based version of the active disturbance rejection control(ADRC)scheme,in which the unknown higher-order terms of the reference signal are treated as additional components of the system"total disturbance".The motivation here is to provide a practical following of a reference voltage trajectory for the buck converter in specific cases where neither the analytical form of the desired signal nor its future values are known a'priori,hence cannot be directly used for control synthesis.In this work,the application of the error-based ADRC results in a prac-tically appealing control technique,with compact structure,simplified control rule,and intuitive tuning(inherited from the conventional output-based ADRC scheme).Theoretical,numerical,and experimental results are shown to validate the efficacy of the error-based ADRC in buck converter control,followed by a discussion about the revealed theoretical and practical limitations of this approach.
Hebertt Sira-RamírezMario Andres Aguilar-Ordu?aBrian C.Gómez-León
113-126页
查看更多>>摘要：This article deals with a linear classical approach for the robust output reference trajectory tracking control of nonlinear SISO Lagrangian systems with a controllable(flat)tangent linearization around an operating equilibrium point.An endogenous injections and exogenous feedback(EIEF)approach is proposed,which is naturally equivalent to the generalized propor-tional integral control method and to a robust classical compensation network.It is shown that the EIEF controller is also equivalent,within a frequency domain setting demanding respect for the separation principle,to the reduced order observer based active disturbance rejection control approach.The proposed linear control approach is robust with respect to total dis-turbances and,thus,it is effective for the linear control of the nonlinear Lagrangian system.An illustrative nonlinear rotary crane Lagrangian system example,which is non-feedback linearizable,is presented along with digital computer simulations.
查看更多>>摘要：An adaptation of the active disturbance rejection control(ADRC)approach is applied to a fractional-order system with a flat output.Albeit the rather scarce information about the system,the conditions to establish an ultimate bound for a specific configuration of the system are found and compiled in a guideline for the tuning of the observer implemented in the ADRC.
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