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L1 adaptive sampled-data control for uncertain multi-input multi-output systems

AUTOMATICA 2019年 103卷 346-353页

作者： Jafarnejadsani, Hamidreza Lee, Hanmin Hovakimyan, Naira Univ Illinois Dept Mech Sci & Engn Urbana IL 61801 USA Univ Illinois Dept Aerosp Engn Urbana IL 61801 USA

This paper develops a sampled-data (SD) controller for uncertain multi-input multi-output (MIMO) systems, possibly with non-minimum phase zeros, using the L-1 adaptive control architecture. The proposed controller compensates for disturbances and uncertainties within the bandwidth of a low-pass filter. Sufficient conditions for robust stability are obtained for the closed-loop system with SD controller, where the input/output signals are held constant over a sampling period. It is shown that the hybrid closed-loop system can recover the performance of a continuous-time reference system as the sampling time of the SD controller tends to zero. Simulation examples are provided to validate the theoretical findings. (C) 2019 Elsevier Ltd. All rights reserved.

关键词： multi-input multi-output system L-1 adaptive sampled-data control output-feedback Disturbance compensation Digital controller Non-minimum-phase system

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AC Impedance Modeling of True- Bipolar MMC-HVdc system With Dual-Droop Control

AC Impedance Modeling of True- Bipolar MMC-HVdc System With ...

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14th Annual IEEE Energy Conversion Congress and Exposition (IEEE ECCE) / IEEE-Industry-Applications-Society (IEEE-IAS) Annual Meeting

作者： Feng, Bole Wang, Yue Li, Pengkun Zhu, Quanle Xue, Yinglin Li, Fengmo Li, Runtian Liu, Yi Xi An Jiao Tong Univ State Key Lab Elect Insulat & Power Equipment Xian Peoples R China State Grid Corp China State Grid Econ & Technol Res Inst Co Ltd Beijing Peoples R China

ISBN: (数字)9781728193878

ISBN: (纸本)9781728193878

Droop control strategy proposed by referring to the output power versus frequency and voltage amplitude curve of the generator is used in the true-bipolar modular multilevel converter (MMC)- high-voltage direct current (HVdc) system. The other side of the true-bipolar MMC-HVdc system is generally connected to a large-scale new energy generation field. In this situation, people find that the oscillation problem occurs from time to time. To study systems with a high proportion of power electronics, this article respectively establishes the small-signal multi-input multi-output (MIMO) sequence impedance model of the ac side of a pseudo-bipolar MMC-HVdc system and a true-bipolar MMC-HVdc system considering frequency coupling. Simulation models are established on the MATLAB/Simulink platform to verify the accuracy of the established model.

关键词： True-bipolar droop control Sequence Impedance modeling Frequency coupling multi-input multi-output system

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Adaptive Compensation of Unmatched Disturbances in Unstable MIMO LTI Plants with Distinct input Delays 22

Adaptive Compensation of Unmatched Disturbances in Unstable ...

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22nd World Congress of the International Federation of Automatic Control (IFAC)

作者： Nikiforov, Vladimir O. Paramonov, Aleksei V. Gerasimov, Dmitry N. ITMO Univ Kronverksky Pr 49 St Petersburg 197101 Russia

ISBN: (纸本)9781713872344

The paper concerns the problem of adaptive compensation of unmatched disturbances in linear time-invariant (LTI) multi-input multi-output (MIMO) unstable plants with multiple distinct input delays. The external disturbances affect both the input and the output of the plant and are represented by multi-harmonic signals with unknown parameters (frequencies, phases, and amplitudes). The paper extends results of the paper Nikiforov et al. (2021) on adaptive compensation of unmatched disturbances to the case of distinct input delays. To overcome the problem of multiple distinct input delays, a special scheme of the disturbance prediction is proposed and used for design of the adaptive control *** (c) 2023 The Authors.

关键词： Distinct input delays predictor-feedback stabilizing control adaptive control unmatched disturbance compensation multi-input multi-output system

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Reduced-order disturbance observer-based adaptive reaching law control for discretized MIMO systems with unmatched uncertainties

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NONLINEAR DYNAMICS 2021年第2期105卷 1611-1623页

作者： Wang, Cong Xia, Hongwei Wang, Yanmin Ren, Shunqing Harbin Inst Technol Sch Astronaut Harbin Peoples R China Harbin Inst Technol Sch Automat & Elect Engn Harbin Peoples R China

In this paper, an adaptive discrete-time sliding mode control based on reduced-order disturbance observer is proposed for discretized multi-input multi-output systems subjected to unmatching condition. By using the designed discrete reduced-order disturbance observer, a new sliding surface is constructed to counteract the unmatched uncertainties. Then, to guarantee a smaller width of the quasi-sliding mode domain, an adaptive reaching law is developed, whose switching gain is adaptively tuned to prevent overestimation of disturbance on the premise of ensuring the reaching condition of sliding surface;meanwhile, the ranges of the quasi-sliding mode band and attractiveness region are deduced. The proposed control algorithm has low computational complexity and needs no information about the upper bound of unmatched uncertainty. The simulations on the control of a bank-to-turn missile demonstrates that the proposed method can effectively reject unmatched disturbance and provide higher accuracy in comparison with traditional methods.

关键词： Discrete-time sliding mode control Adaptive reaching law Reduced-order disturbance observer Unmatched uncertainty multi-input multi-output system

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Design, implementation and model predictive based control of a mode-changeable DC/DC converter for hybrid renewable energy systems

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ISA TRANSACTIONS 2021年 114卷 485-498页

作者： Guler, Naki Irmak, Erdal Gazi Univ Tech Sci Vocat Sch Ankara Turkey Gazi Univ Fac Technol Elect & Elect Engn Dept Ankara Turkey

Since renewable energy sources such as PV and wind provide intermittent energy generation, this paper presents an advanced DC/DC converter that is able to set its operational mode automatically to either multi-input multi-output (MIMO) or single-input multi-output (SIMO) depending on the input source conditions. Power flow is controlled through the auxiliary relays added to a double-layer boost converter. Considering the transient events require fast dynamic response, model predictive control (MPC) is used to achieve the current control processes for both layers. Furthermore, the MPC is modified to adapt itself to changes in the topology. The proposed system is verified by simulations and experimentally. Results show that the proposed mode-changeable converter successfully determines the optimum power route after deciding the best operational mode in accordance with the input source conditions. Furthermore, the control method achieves a powerful and effective control process in both MIMO and SIMO modes. (C) 2020 ISA. Published by Elsevier Ltd. All rights reserved.

关键词： Hybrid renewable energy system Mode-changeable converter Model predictive control multi-input multi-output system

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Application of Taguchi design in system identification: A simple, generally applicable and powerful method

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MEASUREMENT 2020年 151卷 106879-000页

作者： Ghazbi, Somayeh Norouzi Akbarzadeh, Alireza Akbarzadeh-T, Mohammad-R Ferdowsi Univ Mashhad Dept Mech Engn POB 91775-1119 Mashhad *** Razavi Khorasan Iran Ferdowsi Univ Mashhad Dept Elect Engn Mashhad Razavi Khorasan Iran Ferdowsi Univ Mashhad Ctr Excellence Soft Comp & Intelligent Informat P Mashhad Razavi Khorasan Iran

This paper is a development of the authors' recently published idea on a simple and generally applicable system identification algorithm based on Taguchi method. In the previous paper, the effectiveness of the algorithm in identifying nonlinear systems was shown. This paper presents the modified algorithm with the capability of identifying multi-input multi-output (MIMO) systems, and systems with unknown parameters of quite different value-ranges. Regarding the former, a contribution analysis is introduced and utilized to determine that the model between which of the input-output pairs should be identified first. The results proved that this idea significantly results in less time-cost. Moreover, the study develops the identification algorithm by adding a step of breaking down the identification process to multiple steps, each identifying a group of parameters that are in about the same value-range. Utilizing Taguchi method that includes human intelligence in the loop, the presented method effectively saved the process time and led to a more accurate estimation. In the method presented, the algorithm identifies a group of parameters at each step starting with the most contributor ones rather than identifying all of them at once. To group parameters, a contribution analysis is employed. To prove the effectiveness of the method, without loss of generality, the algorithm is applied on a multi-input single-output system. The experimental test-setup used in this study is a custom-made linear series elastic actuator that is designed for lower limb exoskeletons in Ferdowsi University of Mashhad (FUM)-Robotic Laboratory. (C) 2019 Published by Elsevier Ltd.

关键词： system identification Taguchi multi-input multi-output system MIMO Nonlinear systems Non-parametric system

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Smooth second-order sliding mode controller for multivariable mechanical systems

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SN APPLIED SCIENCES 2021年第10期3卷 816页

作者： Chawengkrittayanont, Panitnart Pukdeboon, Chutiphon Kuntanapreeda, Suwat Moore, Elvin J. King Mongkuts Univ Technol North Bangkok Fac Appl Sci Dept Math Bangkok Thailand King Mongkuts Univ Technol North Bangkok Fac Engn Dept Mech & Aerosp Engn Bangkok Thailand Ctr Excellence Math CHE Si Ayutthaya Rd Bangkok 10400 Thailand

This paper proposes a smooth second-order sliding mode controller for a class of multi-input multi-output mechanical systems with uncertain parameters and external disturbances. Since the control law is smooth, the chattering effect that can occur with non-smooth controllers is reduced. Lyapunov-based theorems are used to prove global and finite-time convergence of the sliding mode controller. Numerical simulations are presented to illustrate the performance of the proposed controller by applying it first to a variable-length pendulum and then to a two-link robotic manipulator. For the robotic manipulator, a detailed comparison is given of the finite-time convergence and chattering properties of the proposed controller, a super-twisting controller and a super-twisting like controller.

关键词： Finite-time convergence Second-order sliding mode control Smooth sliding mode control multi-input multi-output system

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Adaptive Compensation of Unmatched Disturbances in Unstable MIMO LTI Plants with Distinct input Delays

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IFAC-PapersOnLine 2023年第2期56卷 9179-9184页

作者： Vladimir O. Nikiforov Aleksei V. Paramonov Dmitry N. Gerasimov ITMO University Kronverksky Pr. 49 St. Petersburg 197101 Russia

关键词： Distinct input delays predictor-feedback stabilizing control adaptive control unmatched disturbance compensation multi-input multi-output system

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An approximate dynamic programming method for multi-input multi-output nonlinear system

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OPTIMAL CONTROL APPLICATIONS & METHODS 2013年第1期34卷 80-95页

作者： Huang, Zhijian Ma, Jie Huang, He Shanghai Jiao Tong Univ Ocean Engn State Key Lab Shanghai 200240 Peoples R China Shanghai Maritime Univ Merchant Marine Coll Shanghai 200135 Peoples R China IMS Automot Elect Syst Co Ltd Shanghai 200335 Peoples R China

Approximate dynamic programming is a useful tool in solving multi-stage decision optimal control problems. In this work, we first promote the action-dependent heuristic dynamic programming method to multi-input multi-output control system by extending its action network to multi-output form. The detailed derivation is also given. We then apply this method to the fluctuation control of a spark engine idle speed. An engine idling model is set up to verify the control effect of this method. Results here show that this method requires several iterations to suppress unbalanced combustion by manipulating spark ignition timing. This method provides an alternative for a simpler multi-input multi-output approximate dynamic programming scheme. Moreover, it has a faster iteration convergence effect. The derivation of this method also has a rigorous mathematical basis. Although illustrated for engines, this control system framework should also be applicable to general multi-input multi-output nonlinear system. Copyright (C) 2011 John Wiley & Sons, Ltd.

关键词： approximate dynamic programming adaptive critic designs fluctuation control of an engine idling neural network multi-input multi-output system

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A multiport Isolated DC-DC Converter for Plug-in Electric Vehicles Based on Combination of Photovoltaic systems and Power Grid 12

A Multiport Isolated DC-DC Converter for Plug-in Electric Ve...

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12th Power Electronics, Drive systems, and Technologies Conference (PEDSTC)

作者： Ebadpour, Mohsen Islamic Azad Univ Ahar Dept Elect Engn Ahar Branch Ahar Iran

ISBN: (纸本)9781665403665

In this study, a multiport isolated DC-DC converter is proposed for charging of plug-in electric vehicles, which can interface among the photovoltaic (PV) systems, vehicle batteries, and power grid. The proposed converter is dual-output, and vehicle batteries can charge from both PV systems and grid simultaneously or separately. Moreover, the converter is bidirectional, capable of delivering power from vehicle batteries to grid by using the half-bridge CLLLC resonant topology with less switching devices. Furthermore, a unified multi-input multi-output (MIMO) controller is used for control of converter. The main topology, operating scenarios, and control system of converter are presented. To validate the performance of the converter, the system is simulated by MATLAB/Simulink software and results are illustrated to prove the controller accuracy during different operation modes.

关键词： multiport converter photovoltaic system unified controller plug-in electric vehicles multi-input multi-output system

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