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A hybrid MFO-GHNN tuned self-adaptive FOPID controller for ALFC of renewable energy integrated hybrid power system

IET RENEWABLE POWER GENERATION 2021年第7期15卷 1582-1595页

作者： Ramachandran, Rajeswari Satheesh Kumar, Jeevitha Madasamy, Balasubramonian Veerasamy, Veerapandiyan Govt Coll Technol Dept Elect Engn Coimbatore Tamil Nadu India Alagappa Chettiar Coll Engn & Technol Dept Elect Engn Karaikkudi Tamil Nadu India Univ Putra Malaysia UPM Dept Elect & Elect Engn Fac Engn Adv Lightning Power & Energy Res ALPER Serdang Selangor Malaysia

This paper proposes a hybrid moth flame optimization-generalized Hopfield neural network (MFO-GHNN) optimized self-adaptive fractional order proportional integral derivative (FOPID) controller for automatic load frequency control of multi-area hybrid power system (HPS). The control problem is formulated with an objective function of area control error associated with unknown parameters such as K-p, K-i, K-d, lambda and mu of FOPID controller. The fractional order of differentiator and integrator terms, and the initial values of K-p, K-i and K-d, are drawn from MFO algorithm. Then, the K-p, K-i and K-d are fine-tuned by solving the dynamic equations governing the behaviour of GHNN under system uncertainties. To test the practicability and effectiveness of the proposed controller, the multi-area HPS is studied with uncertain change in load demand, system parameters, solar and wind power generation. The proposed method is modelled using MATLAB/Simulink. The results showed that the steady state and transient performance indices of proposed FOPID controller are significantly enhanced than the PID, MFO-FOPID and GHNN-PID controllers. In addition, the stability of non-linear dynamic HPS is analysed using Matignon's theorem of stability. Further, the performance of controller is validated using real time digital simulator run in hardware-in-the loop environment.

关键词： Optimisation techniques Frequency control control of electric power systems Optimisation techniques Power system management, operation and economics Power system control control system analysis and synthesis methods

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Non-fragile H∞ control for LPV-based CACC systems subject to denial-of-service attacks

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IET control THEORY AND APPLICATIONS 2021年第9期15卷 1246-1256页

作者： Huang, Cong Karimi, Hamid Reza Donghua Univ Sch Informat Sci & Technol Shanghai Peoples R China Minist Educ Engn Res Ctr Digitalized Text & Fash Technol Shanghai Peoples R China Politecn Milan Dept Mech Engn Via La Masa 1 I-20156 Milan Italy Nantong Univ Sch Transportat & Civil Engn Nantong Peoples R China

This paper is concerned with a non-fragile H infinity state feedback control issue for linear parameter-varying collaborative adaptive cruise control systems subject to denial-of-service attacks. The dynamics of the collaborative adaptive cruise control system is described by a linear model where the deviation of the position and the velocity are selected as the state variables. The attack model is utilized, thereby better reflecting the randomly occurring phenomenon of the denial-of-service attacks based on a sequence of binary random variables. The main objective of this note is to develop a non-fragile state feedback control scheme such that, for denial-of-service attacks and possible parameter variations in controller gains, the exponential mean-square stability and the predefined performance index for the system states are guaranteed simultaneously. By using the matrix analysis techniques and Lyapunov stability theory, sufficient conditions for the desired controller are established and solved based on the solutions to the linear matrix inequality conditions. Finally, a three-car model is provided to check the feasibility of the designed control scheme.

关键词： Velocity, acceleration and rotation control Interpolation and function approximation (numerical analysis) Algebra Other topics in statistics Linear control systems control system analysis and synthesis methods Stability in control theory Optimal control Self-adjusting control systems Nonlinear control systems

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Fault tolerance in non-linear systems: A model-based approach with a robust soft sensor design

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IET control THEORY AND APPLICATIONS 2021年第4期15卷 499-511页

作者： Doraiswami, Rajamani Cheded, Lahouari Univ New Brunswick Dept Elect & Comp Engn Fredericton NB Canada

A novel multiple Kalman filtre (KF)-based scheme is proposed, as a generalisation of conventional gain-scheduling techniques, for fault diagnosis and tolerance in a large class of multiple-input and multiple-output non-linear systems. The outputs are corrupted by unknown stochastic disturbance and measurement noise. A reliable and computationally efficient, two-stage identification of a piecewise linear parameter-varying Box-Jenkins dynamic model that better approximates the non-linear system, at each operating point, and the design of the associated KFs are proposed. Novel emulators, whose induced parameter changes mimic likely and predictive operating scenarios, are used to provide an accurate model identification and robustness to noise, disturbance, non-linearity errors and model perturbations. These crucial emulators generate missing representative data, aid predictive analytics, and improve the reliability and accuracy of the identified KF model. A novel formulation of the KF is used for fault isolation, and the Bayes strategy is used to isolate difficult-to-detect incipient faults in noisy environments. The proposed scheme leads to the design of a novel robust soft sensor aimed at replacing the maintenance-prone hardware sensor in practical applications including product quality assessment, performance monitoring, condition-based maintenance, fault diagnosis and fault-tolerant control. The proposed soft sensor was successfully evaluated on simulated and laboratory-scale physical control systems.

关键词： Other topics in statistics Other topics in statistics control system analysis and synthesis methods Nonlinear control systems Aerospace control Interpolation and function approximation (numerical analysis) Linear control systems

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Design of uncertainty and disturbance estimator based tracking control for fuzzy switched systems

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IET control THEORY AND APPLICATIONS 2021年第14期15卷 1804-1817页

作者： Sakthivel, R. Harshavarthini, S. Almakhles, Dhafer J. Kavikumar, R. Bhatathiar Univ Dept Appl Math Coimbatore Tamil Nadu India Sungkyunkwan Univ Dept Math Suwon South Korea Prince Sultan Univ Renewable Energy Lab Riyadh Saudi Arabia Prince Sultan Univ Commun & Networks Engn Dept Riyadh Saudi Arabia Anna Univ Dept Math Reg Campus Coimbatore Tamil Nadu India

In this paper, an uncertainty and disturbance estimator (UDE)-based control is employed to ensure the finite-time tracking and disturbance rejection performance for a class of Takagi-Sugeno fuzzy switched systems including additive time-varying delays, unknown time-varying uncertainties and disturbances. To be precise, the robust tracking performance is achieved by estimating unknown uncertainties and disturbances with the aid of low-pass filter by means of appropriate bandwidth choice of the desired filter. Moreover, a new delay-dependent finite-time stability criterion is derived by employing fuzzy-dependent Lyapunov-Krasovskii functional, extended Wirtinger's integral inequality and average dwell-time approach to enforce the addressed system to track the given reference system within a finite period of time. Finally, the developed theoretical results are ensured by presenting the numerical examples with simulation results.

关键词： Algebra control system analysis and synthesis methods Stability in control theory Optimal control Fuzzy control Time-varying control systems Distributed parameter control systems Nonlinear control systems

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On the tuning of a nonlinear energy-based regulator for the positioning of a fully actuated surface marine craft

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IET control THEORY AND APPLICATIONS 2021年第6期15卷 850-860页

作者： Kazantzidou, Christina Perez, Tristan Valentinis, Francis Donaire, Alejandro Queensland Univ Technol Sch Elect Engn & Robot Brisbane Qld 4000 Australia Queensland Univ Technol Sch Elect Engn & Comp Sci Brisbane Qld Australia RMIT Univ Sch Engn Melbourne Vic Australia Univ Newcastle Sch Engn Callaghan NSW Australia

The authors address the problem of tuning a non-linear energy-based regulator for the positioning of a surface marine craft. Interconnection and damping assignment passivity-based control (IDA-PBC) is used for the control design, resulting in passive target dynamics that can be expressed as a port-Hamiltonian system (PHS). The IDA-PBC methodology has been successfully utilised in several applications, however, there has been minimal development in tuning methods that can analytically assist the designer to achieve desired response characteristics. It is demonstrated that eigenvalue assignment of the linearised target dynamics in PHS form can significantly aid the tuning process. Based on this analysis, the authors propose a systematic tuning approach to achieve certain performance and response characteristics. A comprehensive demonstration of the proposed tuning method is provided for the position regulation of an underwater vehicle in the horizontal plane in a case study, where numerical analysis of robustness is also conducted.

关键词： nonlinear energy-based regulator linearised target dynamics Spatial variables control response characteristics surface marine craft PHS horizontal plane port-Hamiltonian system damping interconnection and damping assignment passivity-based control systematic tuning underwater vehicle Marine system control control system synthesis control system analysis and synthesis methods Nonlinear control systems numerical analysis underwater vehicles eigenvalues and eigenfunctions IDA-PBC methodology Linear algebra (numerical analysis) nonlinear control systems control design position control robustness position regulation passive target dynamics

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Robust control of pantograph-catenary system: Comparison of 1-DOF-based and 2-DOF-based control systems

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IET control THEORY AND APPLICATIONS 2021年第18期15卷 2258-2270页

作者： Yu, Pan Liu, Kang-Zhi Li, Xiaoli Yokoyama, Makoto Beijing Univ Technol Fac Informat Technol Beijing Inst Artificial Intelligence Beijing Peoples R China Chiba Univ Dept Elect & Elect Engn Chiba Japan Niigata Univ Grad Sch Sci & Technol Niigata Japan

Compared to control bandwidth, low-frequency uncertainties or disturbances like step signals can be well rejected by many methods having two-degree-of-freedom (2-DOF). Due to robustness constraint, technically more challenging is the rejection of medium frequencies, especially for bandwidth-limited systems. Here, the equivalent-input-disturbance (EID) approach is extended to deal with the main medium-frequency oscillation of a pantograph-catenary system. First, a general EID estimator is developed with a low-frequency estimator as a special case. Then, a fair comparison is conducted to clarify the essential differences between the conventional 1-DOF-based and the developed 2-DOF-based control systems. Furthermore, a robust stability condition is derived for the 2-DOF-based closed-loop control system. A design algorithm together with design guidelines is provided, where the frequency characteristics of the uncertainties are utilized in the parameter design. Finally, simulations are carried out to validate the developed 2-DOF-based method for the pantograph-catenary system in realistic environment.

关键词： Optimisation techniques control system analysis and synthesis methods Stability in control theory Optimal control

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Design and analysis of a novel AC-side power decoupling circuit

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IET POWER ELECTRONICS 2021年第7期14卷 1336-1346页

作者： Yonggao Zhang Weidong Fu Peng Liu Yu Chang Sheng Yan East China Jiaotong Univ Sch Elect & Automat Engn Nanchang Jiangxi Peoples R China

A large amount of second (2 omega) ripple power are coupled on the DC bus of a single-phase inverter due to the output pulsating power. In this paper, a novel AC-side power decoupling circuit (APDC) based on buck-boost is proposed for a single-phase inverter. The circuit is connected in parallel with the AC side of the inverter to realise the local decoupling of the pulsating power on the AC side. The working principle of APDC is elaborated and the switching sequence of APDC is derived. The corresponding pulse energy modulation (PEM) control strategy is designed to precisely control the decoupled power. The feasibility and superiority of the proposed APDC together with the PEM control strategy are finally verified by both the simulation and experimental results obtained on a 200 W single-phase inverter. The results show that 2 omega-ripple power of the system can be effectively buffered and the capacitor capacity in the inverter system is greatly reduced.

关键词： Power electronics, supply and supervisory circuits Capacitors control system analysis and synthesis methods

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Parameter-space-based robust control of event-triggered heterogene-ous platoon

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IET INTELLIGENT TRANSPORT systemS 2021年第1期15卷 61-73页

作者： Ma, Fangwu Wang, Jiawei Yu, Yang Wu, Liang Liu, Zhenze Aksun-Guvenc, Bilin Guvenc, Levent Jilin Univ Coll Automot Engn Changchun 130022 Peoples R China Ohio State Univ Automated Driving Lab Columbus OH 43210 USA Jilin Univ Coll Commun Engn Changchun Peoples R China

A parameter-space-based robust platooning controller for the event-triggered heterogeneous platoon is presented. The novel heterogeneous platoon is established with different longitudinal vehicle dynamic and driving preferences and the event-triggered communication scheme is designed to reduce the utilization of communication resources. To handle the stricter demand of the heterogeneous system and the disturbance caused by event-triggered communication scheme, the parameter space approach is adopted to optimize the gains of a robust controller. The feasible region where internal stability and L2 string stability are satisfied is then visualized in the parameters space, by extending the parameter space approach to the D-stability and frequency response magnitude specifications. Subsequently, the robust controller, which combines the feedforward loop and feedback loop, is developed by selecting the gain from the feasible solution area. The simulation results of the event-triggered heterogeneous platoon are presented and evaluated to verify the efficiency of this control algorithm. It is seen that the internal stability and string stability of the event-triggered heterogeneous platoon are guaranteed by this robust controller. Furthermore, 89.7% of communication resources are saved by the application of event-triggered communication scheme, while the following performance is also favourable during the highway fuel economy cycle.

关键词： Optimisation techniques Road-traffic system control Vehicle mechanics Optimisation techniques control system analysis and synthesis methods Stability in control theory Optimal control Nonlinear control systems

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Separation principle for discrete-time quasi-one-sided Lipschitz nonlinear systems

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IET control THEORY AND APPLICATIONS 2021年第1期15卷 136-147页

作者： Dong, Wenqiang Hu, Guang-Da Cong, Yuhao Shanghai Univ Dept Math Shanghai 200444 Peoples R China Shanghai Customs Coll Shanghai Peoples R China

This paper is concerned with output stabilisation for a class of discrete-time quasi-one-sided Lipschitz nonlinear systems. Firstly, an observer is designed for estimating the state of the systems in terms of quasi-one-sided Lipschitz condition and quadratic inner-boundness condition. Then, a state feedback controller is proposed to stabilize the systems. Subsequently, it is shown that the separation principle holds for stabilisation of the discrete-time nonlinear systems based on the observer-based controller. Under the quasi-one-sided Lipschitz condition, the state observer and feedback controller can be designed separately, even though the parameter (A,B) of discrete-time systems is not stabilisable and parameter (A,C) is not detectable. Finally, two numerical examples are given to indicate the feasibility of the main results.

关键词： Simulation, modelling and identification Algebra control system analysis and synthesis methods Stability in control theory Optimal control Discrete control systems Nonlinear control systems

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Frequency coordinated control strategy based on sliding mode method for a microgrid with hybrid energy storage system

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IET GENERATION TRANSMISSION & DISTRIBUTION 2021年第13期15卷 1962-1971页

作者： Ge, Shaoyun He, Xingtang Liu, Hong Mi, Yang Wang, Chengshan Tianjin Univ Minist Educ Key Lab Smart Grid Tianjin 300072 Peoples R China Shanghai Univ Elect Power Sch Elect Engn Shanghai Peoples R China

Frequency stability is important for microgrid with renewable energy. However, the deterioration of frequency and the increased energy storage equipment are caused by source-load uncertainty. Therefore, a frequency coordinated control strategy based on sliding mode method for a microgrid with hybrid energy storage system (HESS) is proposed. First of all, the detailed frequency regulation is designed, which divides deviation of frequency and area control error into different components as power reference value of different power supply. Secondly, the power threshold of HESS, which is consisted of ultra-capacitor and battery, is set by designed fuzzy controller to reduce reserve power of HESS and avoid unreasonable power output. Thirdly, a load frequency control model with HESS is built and a sliding mode control is designed by using the detailed frequency regulation. Finally, the effectiveness of the proposed frequency coordinated control strategy is verified through comparison of different cases.

关键词： Frequency control control of electric power systems Distributed power generation Power system control control system analysis and synthesis methods Multivariable control systems Fuzzy control

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