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Bearing-only circumnavigation control of the multi-agent system around a moving target

IET control THEORY AND APPLICATIONS 2019年第17期13卷 2747-2757页

作者： Yu, Yangguang Li, Zhongkui Wang, Xiangke Shen, Lincheng Natl Univ Def Technol Coll Mechatron & Automat Changsha 410073 Hunan Peoples R China Peking Univ Coll Engn Dept Mech & Aerosp Engn State Key Lab Turbulence & Complex Syst Beijing 100871 Peoples R China

The bearing-based coordinated circumnavigation control for networked multi-agent systems with only bearing measurements in the presence of moving target is studied. First, a distributed algorithm is proposed to estimate the target's velocity and the distances between the agents and the target, based on the velocity and the bearing information of the local network. Then, a distributed circumnavigation algorithm is designed to drive the agents to circumnavigate around a moving target at a desired distance. The stability of the proposed control algorithm is proven by employing the newly developed bearing rigidity theory. Finally, the simulation experiment is performed based on the Gazebo simulator to illustrate the effectiveness of the proposed circumnavigation control law.

关键词： mobile robots aerospace control multi-robot systems multi-agent systems control engineering computing numerical analysis mathematical analysis motion control space vehicles bearing-only multiagent system moving target bearing-based networked multiagent systems bearing measurements distributed algorithm bearing information local network distributed circumnavigation algorithm control algorithm circumnavigation control law

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Review on system development in eddy current testing and technique for defect classification and characterization

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IET CIRCUITS DEVICES & SYSTEMS 2017年第4期11卷 338-351页

作者： Bin Ali, Kharudin Abdalla, Ahmed N. Rifai, Damhuji Faraj, Moneer A. Univ Malaysia Pahang Fac Engn Technol Pekan Pahang Malaysia TATI Univ Coll Fac Elect & Automat Engn Technol Terengganu Malaysia

Eddy current testing (ECT) is one of the non-destructive evaluation techniques widely used, especially in oil and gas industries. It characterized noisy data to the less-than-perfect detection and as an indication of serious false alarm problem. However, not many researchers have described in detail the intelligent ECT crack detection system. This paper introduces a review of ECT technique and factors that affect the signal fundamental according to the hardware and software development. First, describe the magnetic excitation resources including the sinusoidal and pulse exciting signal. Second, outlines explanation about the ECT probe. The explanations are more about the probes development for air core probe and giant magnetoresistance probe. Third, there is discussion on ECT circuit that used including ECT system, ECT rotating magnetic field and application measurement for optimal control parameters. The defect in characterizations and measurement are discussed on the fourth part of this paper. The fourth part discusses the ECT lift-off compensation including the lift-off and application of intelligent technique in ECT. The limitations of lift-off for coil probe and compensation techniques also discussed in this part. Finally, a comprehensive review of previous studies on the application of intelligent ECT crack detection in nondestructive ECT is presented.

关键词： eddy current testing crack detection magnetic fields optimal control software architecture control engineering computing eddy current testing defect classification defect characterisation nondestructive evaluation techniques oil industries gas industries nuclear industries coating industries intelligent ECT crack detection system nondestructive testing signal fundamental hardware development software development magnetic excitation resources sinusoidal exciting signal pulse exciting signal air core probe giant magnetoresistance probe electronic circuit rotating magnetic field optimal control parameters air coil lift-off

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Online sensorless position estimation for switched reluctance motors using characteristics of overlap position based on inductance profile

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IET ELECTRIC POWER APPLICATIONS 2019年第4期13卷 456-462页

作者： Kim, Jae-Hoon Kim, Rae-Young Hanyang Univ Dept Elect & Biomed Engn Seoul South Korea

This study proposes an online sensorless position estimation method using switched reluctance motor (SRM) characteristics of overlapped position. The SRM drive system operation requires rotor position information of the motor to apply or commutate the current flowing in each phase winding. Conventional position sensorless control methods have some limitations due to complicated calculations, large memory space requirements dependency on lookup tables, and drive limitations for specific motors. To overcome these limitations, the proposed method uses the characteristics of the overlapping position of the SRM to estimate the rotor position information and hybrid sensorless control by varying the control method according to the operating section. The proposed sensorless position estimation method is verified experimentally using a 400W 4/2 SRM.

关键词： position control sensorless machine control reluctance motor drives rotors inductance table lookup control engineering computing overlap position online sensorless position estimation method switched reluctance motor characteristics SRM drive system operation rotor position information control method memory space requirements dependency hybrid sensorless control inductance profile current flow phase winding lookup tables

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Design of wide-area damping systems based on the capabilities of the supporting Information Communication Technology infrastructure

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IET GENERATION TRANSMISSION & DISTRIBUTION 2014年第4期8卷 640-650页

作者： Zhu, Kun Nordstrom, Lars KTH Royal Inst Technol Sch Elect Engn Dept Ind Informat & Control Syst SE-10044 Stockholm Sweden

The dependence of the functionality of the wide-area monitoring and control (WAMC) systems on the capabilities of their underlying Information Communication Technology (ICT) infrastructure indicates that the parameterisation of the WAMC application algorithm should be coordinated with the design of the supporting ICT system. This study presents a systematic approach to design wide-area damping systems considering phasor measurement unit (PMU) communication delays and data frame losses. The proposed design method is applied to calibrate a wide-area damping system based on generalised predictive control (GPC) for demonstration purposes. In addition, a framework to guide the parameterisation of the GPC- based wide-area damping system is also provided. This research offers a better perspective to predict the capabilities of the underlying ICT infrastructure in the WAMC systems. Moreover, the proposed design method can be generalised to design delay-robust damping systems with compensation limits. Finally, it also offers an opportunity to associate the parameterisation of the damping system with the capabilities of its supporting ICT infrastructure and the reliability of the intended damping control function.

关键词： control engineering computing control system synthesis damping delay systems power engineering computing power system control predictive control phasor measurement wide-area damping system design information communication technology infrastructure wide-area monitoring and control system WAMC application algorithm ICT system phase measurement unit PMU communication delays generalised predictive control delay-robust damping systems

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Signal difference-based deadband control for networked control systems with variable sampling intervals

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IET control THEORY AND APPLICATIONS 2014年第15期8卷 1439-1448页

作者： Liu, Ying-Ying Che, Wei-Wei Chu, Yun-Kai Shenyang Univ Sch Informat Engn Shenyang 110044 Peoples R China Shenyang Univ Key Lab Mfg Ind Integrated Automat Shenyang 110044 Peoples R China Chinese Acad Sci Shenyang Inst Automat Shenyang 110016 Liaoning Peoples R China

This study investigates a signal difference-based deadband control approach as a solution to reduce data transmission in networked control systems (NCSs). A new modelling method for the NCSs with time-varying delays, time-varying sampling intervals and signal transmission deadbands is presented. The Lyapunov functional with discontinuity is exploited, which takes full advantages of the NCSs' characteristic information including the bounds of network delay (BND), the bounds of sampling interval (BSI) and the bounds of transmission deadband (BTD). In addition, it has been shown that Lyapunov functional decreases at the jump instants. Furthermore, the new stability analysis and stabilisation conditions for the NCSs are proposed, which describes the relationship of BND, BSI, BTD and the system stability. Three examples are used to demonstrate the effectiveness of the proposed methods. The simulation results have shown that the proposed approach could guarantee the system asymptotically stable and effectively reduce the data transmission in network channel.

关键词： networked control systems sampling methods delays time-varying systems Lyapunov methods asymptotic stability control engineering computing signal difference-based deadband control networked control systems variable sampling intervals data transmission NCS time-varying delays time-varying sampling intervals signal transmission deadbands Lyapunov functional bounds of network delay BND bounds of sampling interval BSI bounds of transmission deadband BTD stability analysis stabilisation conditions asymptotic stability network channel

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COMPUTER-AIDED-DESIGN OF control-SYSTEMS VIA OPTIMIZATION

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PROCEEDINGS OF THE INSTITUTION OF ELECTRICAL ENGINEERS-LONDON 1979年第6期126卷 573-578页

作者： BECKER, RG HEUNIS, AJ MAYNE, DQ Department of Computing and Control Imperial College of Science and Technology London UK

The paper describes a computer-aided-design procedure which may be used to design,inter alia, multivariable control systems which satisfy constraints on peak overshoot of step response on control magnitudes, control r... 详细信息

关键词： multivariable control systems control system CAD control system analysis and synthesis methods peak overshoot Optimisation step response Multivariable control systems Optimisation techniques control engineering computing optimisation control rates

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Model-driven real-time control coordination for distribution grids with medium-scale photovoltaic generation

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IET RENEWABLE POWER GENERATION 2017年第12期11卷 1603-1612页

作者： Krata, Jaroslaw Saha, Tapan Kumar Yan, Ruifeng Univ Queensland Sch Informat Technol & Elect Engn Level 4Gen Purpose South Bldg Brisbane Qld 4072 Australia Univ Queensland Global Change Inst BldgTop Staff House Rd Brisbane Qld 4072 Australia

Increasing penetration of photovoltaic (PV) generation may significantly impact existing voltage regulation schemes. In particular, the lack of coordination between control devices and fast change in PV generation can cause voltage magnitude to go beyond limits. This study addresses the issue by providing a novel real-time centralised voltage control algorithm to tackle voltage fluctuations caused by variability of PV power generation. The new method considers autonomous response of upstream voltage regulation devices and provides optimised set-points for the chosen downstream controllers. Furthermore, the investigated method was tested in the real-time digital simulator on a model of 11kV grid located in a semi-rural area of Queensland, Australia. The control algorithm was designed in MATLAB with a multidimensional, non-linear, mixed-integer optimisation. The parallel computing implementation of the KNITRO optimiser helped to provide quicker and more accurate response than the existing uncoordinated control schemes. As a result, optimised control coordination leads to a substantial reduction in voltage fluctuations and decrease in regulation time. Moreover, the proposed method detects and eliminates unnecessary control operations. Thus, it can also prevent voltage hunting in distribution networks.

关键词： power distribution control power grids photovoltaic power systems power generation control voltage control digital simulation control engineering computing power engineering computing integer programming nonlinear programming distribution networks voltage hunting prevention regulation time optimised control coordination KNITRO optimiser parallel computing mixed-integer optimisation nonlinear optimisation multidimensional optimisation MATLAB Australia Queensland real-time digital simulator downstream controllers upstream voltage regulation devices PV power generation variability voltage fluctuations control devices real-time centralised voltage control algorithm voltage magnitude voltage regulation schemes medium-scale photovoltaic generation distribution grids model-driven real-time control coordination

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Testing and validation of wide-area control of STATCOM using real-time digital simulator with hybrid HIL-SIL configuration

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IET GENERATION TRANSMISSION & DISTRIBUTION 2017年第12期11卷 3039-3049页

作者： Musleh, Ahmed S. Muyeen, S. M. Al-Durra, Ahmed Kamwa, Innocent Khalifa Univ Sci & Technol Dept Elect & Comp Engn PI Campus Abu Dhabi U Arab Emirates Curtin Univ Dept Elect & Comp Engn Perth WA Australia Hydroquebec IREQ Power Syst & Math Varennes PQ Canada

This study presents a novel interfacing setup for testing and validating wide-area monitoring and control (WAMC) techniques used in smart grids. The main purpose of this study is to provide a realistic approach for conducting WAMC studies. In here, a wide-area controller (WAC) for a flexible AC transmission system (FACTS) device is implemented. The measurements for the WAC are collected using phasor measurements units (PMUs). Three main segments are being interfaced in this study. First, the real-power grid, the local area controller of the actual FACTS device, and the PMUs are simulated using real-time digital simulator. This simulation represents the central simulation and is interfaced with the WAC, which is realised using a MATLAB-based program. This interface represents a novel software-in-the-loop (SIL) scheme. On the other hand, an actual FACTS device is designed and interfaced to the central simulation via hardware-in-the-loop (HIL) scheme. This SIL and HIL combination makes the experimental testbed more realistic and closer to the industrial standard. Various tests are conducted to examine the performance of the developed testbed.

关键词： static VAr compensators phasor measurement flexible AC transmission systems digital simulation control engineering computing power engineering computing hardware-in-the loop simulation smart power grids power transmission control HIL scheme SIL scheme software-in-the-loop scheme MATLAB-based program PMU phasor measurements units FACTS device flexible AC transmission system device wide-area controller smart grids hybrid HIL-SIL configuration real-time digital simulator STATCOM WAMC techniques wide-area monitoring-and-control techniques

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A CCS CASE-STUDY - A SAFETY-CRITICAL SYSTEM

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SOFTWARE engineering JOURNAL 1991年第4期6卷 159-167页

作者： BAILLIE, J School of Information Sciences Hatfield Polytechnic Hatfield UK

A level-crossing control system is specified in CCS, motivated by a temporal logic specification of the safety requirements. We show that, with certain reservations, these can be satisfactorily stated entirely within CCS. The crossing system is divided into two smaller subsystems, which are shown to be equivalent to the original single system, and whose behaviour is then analysed using the methods of the calculus. We also show that the crossing satisfies the safety requirements;there is no bisimulation although the system is both 'may' and 'must' equivalent to the specification. Some of the implications of this are discussed.

关键词： calculus formal specification control engineering computing Mathematical techniques engineering mathematics and numerical techniques traffic computer control Formal logic Road-traffic system control level-crossing control system Rail-traffic system control safety-critical system CCS Calculus of Communicating Systems process algebras temporal logic temporal logic specification

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Single bit-line 8T SRAM cell with asynchronous dual word-line control for bit-interleaved ultra-low voltage operation

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IET CIRCUITS DEVICES & SYSTEMS 2018年第6期12卷 713-719页

作者： Huang, Chi-Ray Chiou, Lih-Yih Natl Cheng Kung Univ Dept Elect Engn Tainan Taiwan

This study proposes a single bit-line and disturbance-free static random-access memory (SRAM) cell for ultra-low voltage applications. SRAM cell with read-decoupled and cross-point structure addresses both the read-disturb and half-select stability issues;nevertheless, the write-ability is degraded due to the stacked pass transistors. In this study, the authors propose a single-ended 8T bit-cell and dual word-line control technique that can simultaneously improve the read stability, half-select stability, and write-ability without additional peripheral circuits, which is advantageous for bit-interleaved ultra-low voltage operations. A 4kb test chip was implemented in a 90nm complementary metal-oxide-semiconductor process to verify the proposed design. Silicon measurements indicate that the proposed design can operate at a voltage as low as 360mV with 2.68W power consumption.

关键词： CMOS integrated circuits SRAM chips low-power electronics integrated circuit design control engineering computing asynchronous machines machine control asynchronous dual word-line control bit-interleaved ultra-low voltage operation random-access memory cell write-ability read stability ultra-low voltage single bit-line 8T SRAM cell ingle-ended 8T bit-cell dual word-line control half-select stability metal-oxide-semiconductor process

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