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control CONFIGURATION-DESIGN FOR THE AIRCRAFT GAS-TURBINE ENGINE

computing & control engineering JOURNAL 1995年第1期6卷 22-28页

作者： SHUTLER, AG ROLLS ROYCE PLC BRISTOLAVONENGLAND

UK research into the design of multivariable controllers for gas turbines has been under way for several years. The results of simulation and engine test evaluations have been reported by Sulton(6), and Shutler and Betteridge(7). This article focuses on one aspect of multivariable controller design which is that of selecting outputs for closed-loop feedback control;this process is often referred to as control configuration design.

关键词： control configuration design aircraft gas turbine engine simulation Aerospace control control engineering computing aircraft control multivariable controller design process control gas turbines closed loop systems aerospace engines multivariable control systems Multivariable control systems feedback engine test evaluations closed-loop feedback control

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Development of adaptive perturb and observe-fuzzy control maximum power point tracking for photovoltaic boost dc-dc converter

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IET RENEWABLE POWER GENERATION 2014年第2期8卷 183-194页

作者： Zainuri, Muhammad Ammirrul Atiqi Mohd Radzi, Mohd Amran Mohd Che Soh, Azura Rahim, Nasrudin Abd Univ Putra Malaysia Fac Engn Dept Elect & Elect Engn Serdang 43400 Selangor Malaysia Univ Malaya Power Energy Dedicated Adv Ctr UMPEDAC Kuala Lumpur Malaysia

This study presents an adaptive perturb and observe (P&O)-fuzzy control maximum power point tracking (MPPT) for photovoltaic (PV) boost dc-dc converter. P&O is known as a very simple MPPT algorithm and used widely. Fuzzy logic is also simple to be developed and provides fast response. The proposed technique combines both of their advantages. It should improve MPPT performance especially with existing of noise. For evaluation and comparison analysis, conventional P&O and fuzzy logic control algorithms have been developed too. All the algorithms were simulated in MATLAB-Simulink, respectively, together with PV module of Kyocera KD210GH-2PU connected to PV boost dc-dc converter. For hardware implementation, the proposed adaptive P&O-fuzzy control MPPT was programmed in TMS320F28335 digital signal processing board. The other two conventional MPPT methods were also programmed for comparison purpose. Performance assessment covers overshoot, time response, maximum power ratio, oscillation and stability as described further in this study. From the results and analysis, the adaptive P&O-fuzzy control MPPT shows the best performance with fast time response, less overshoot and more stable operation. It has high maximum power ratio as compared to the other two conventional MPPT algorithms especially with existing of noise in the system at low irradiance.

关键词： adaptive control control engineering computing DC-DC power convertors digital signal processing chips fuzzy control perturbation techniques photovoltaic power systems power engineering computing power generation control power system stability maximum power point trackers stability oscillation maximum power ratio time response overshoot performance assessment TMS320F28335 digital signal processing board Kyocera KD210GH-2PU PV module MATLAB-Simulink MPPT performance improvement fuzzy logic control algorithm P& O control algorithm MPPT algorithm photovoltaic boost DC-DC converter adaptive perturb-and-observe-fuzzy control maximum power point tracking

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Online phase margin compensation strategy for a grid-tied inverter to improve its robustness to grid impedance variation

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IET POWER ELECTRONICS 2016年第4期9卷 611-620页

作者： Zheng, Chen Zhou, Lin Yu, Xirui Li, Bin Liu, Jinhong Chongqing Univ State Key Lab Power Transmiss Equipment & Syst Se 174 Shazheng St Chongqing 630044 Peoples R China

According to studies on active damping and the stability margin, grid impedance variation does not make active damping ineffective;instead, it attenuates the stability margin. The harmonic resonance mechanism of grid-tied inverters has been revealed by researching the influence of stability margin reduction on harmonic current amplification coefficients around the cut-off and phase crossover frequencies. With the stability margin decreasing, amplification to harmonics around relevant frequencies is strengthened. The harmonic resonance around the cut-off frequency is triggered as the stability margin decreases to zero. An online phase margin (PM) compensation strategy is proposed in this study to improve system robustness to grid impedance variation. The strategy is implemented by the lead network to enhance the phase and the proportional component to regulate the cut-off frequency according to the grid impedance measured online. Hence, the system can be maintained with a sufficient PM to mitigate the harmonic resonance caused by grid impedance. Simulation and experimental results validate the theoretical analysis presented in this study. Comparisons show that the proposed strategy is superior to the zero compensation strategy in suppressing the harmonic resonance.

关键词： power grids invertors power harmonic filters stability frequency control electric impedance measurement damping control engineering computing power engineering computing online phase margin compensation strategy grid-tied inverter grid impedance variation active damping stability margin reduction harmonic resonance suppression harmonic current amplification coefficients cut-off frequency regulation phase crossover frequencies system robustness improvement grid impedance measurement

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engineering STUDIES FOR ITAIPU CONVERTER STATION DESIGN

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IEE PROCEEDINGS-C GENERATION TRANSMISSION AND DISTRIBUTION 1983年第1期130卷 41-50页

作者： PEIXOTO, CAO FRONTIN, SO JARDINI, JA THEMAG ENGENHARIA BR-22250 RIO DE JANEIROBRAZIL

The paper presents a discussion on some of the engineering studies performed to determine the design parameters of the Itaipu convertor stations. The following studies are discussed: steady-state conditions, reactive-power compensation, insulation co-ordination and arrester protective scheme, current stresses, system stability, main characteristics of the master control, AC and DC filter and DC line resonance. For each of these study areas, the paper gives a summary of the study methodology used, indicates the main study results, and includes some of the system problems encountered and the solution adopted.

关键词： insulation co-ordination Electromagnetic compatibility and interference Power convertors and power supplies to apparatus hydroelectric power stations design parameters AC filter rectifier substations DC line resonance current stresses DC filter control of electric power systems steady-state conditions electromagnetic interference reactive-power compensation system stability invertors Power system management, operation and economics Hydroelectric power stations and plants power system control control engineering computing Substations Itaipu convertor station design reactive power power convertors arrester protective scheme

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UAV payload and mission control hardware/software architecture

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IEEE AEROSPACE AND ELECTRONIC SYSTEMS MAGAZINE 2007年第6期22卷 3-8页

作者： Pastor, Enric Lopez, Juan Royo, Pablo Tech Univ Catalonia Dept Comp Architecture Castelldefels 08860 Barcelona Spain

This paper presents an embedded hardware/software architecture specially designed to be applied on mini/micro Unmanned Aerial Vehicles (UAV). A UAV is a low-cost non-piloted airplane designed to operate in D-cube (Dangerous-Dirty-Dull) situations [8]. Many types of UAVs exist today;however with the advent of UAV's civil applications, the class of mini/micro UAVs is emerging as a valid option in a commercial scenario. This type of UAV shares limitations with most computer embedded systems: limited space, limited power resources, increasing computation requirements, complexity of the applications, time to market requirements, etc. UAVs are automatically piloted by an embedded system named "Flight control System." Many of those systems are commercially available today, however no commercial system exists nowadays that provides support to the actual mission that the UAV should perform. This introduces a hardware/software architecture specially designed to operate as a flexible payload and mission controller in a mini/micro UAV. Given that the missions UAVs can carry on justify their existence;we believe that specific payload and mission controllers for UAVs should be developed. Our architectonic proposal for them orbits around four key elements: a LAN-based distributed and scalable hardware architecture, a service/subscription based software architecture and an abstraction communication layer.

关键词： aerospace computing aircraft control computer architecture control engineering computing distributed processing remotely operated vehicles software architecture LAN-based distributed architecture UAV payload abstraction communication layer embedded hardw Unmanned vehicles Distributed processing Computer Architecture drone honey bees Payload Unmanned Aerial Vehicle Aircraft control control engineering computing Software architecture aerospace computing

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Probabilistic analysis of gear flank micro-pitting risk in wind turbine gearbox using supervisory control and data acquisition data

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IET RENEWABLE POWER GENERATION 2015年第6期9卷 610-617页

作者： Al-Tubi, Issa Long, Hui Tavner, Peter Shaw, Brian Zhang, Jishan Univ Sheffield Dept Mech Engn Sheffield S1 3JD S Yorkshire England Chongqing Univ State Key Lab Mech Transmiss Chongqing Peoples R China Univ Durham Sch Engn & Comp Sci Durham DH1 3LE England Newcastle Univ Design Unit Newcastle Upon Tyne NE1 7RU Tyne & Wear England

This study investigates the probabilistic risk of gear tooth flank micro-pitting in wind turbine (WT) gearboxes and shows how relatively slow rate of supervisory control and data acquisition (SCADA) data, recorded during operation, can be used to analyse the onset of gear surface damage. Field measured time series of SCADA signals, including wind speed, generator power and rotational speed, were used to obtain the statistical variation of gear shaft torque and rotational speed. From the SCADA data obtained over a 2.2 year period random number datasets of smaller sizes were selected. Based on these random number datasets the effect of gear shaft torque and rotational speed variations on the probabilistic risk of gear micro-pitting was investigated. Determinations of the gear tooth flank contact stress and lubricant film thickness were based on the technical report of gear micro-pitting, ISO/TR 15144-1 (2010). The study has shown that the considered pinion gear is subjected to high load conditions resulting in high contact stresses. The variation of rotational speed causes greater sliding between the gear teeth. The results of specific lubricant film thicknesses have shown that there is considerable risk of gear micro-pitting under the operational conditions recorded from the SCADA field data.

关键词： probability gears wind turbines SCADA systems time series statistical analysis shafts lubricants power engineering computing power generation control control engineering computing pinion gear tooth flank micropitting risk wind turbine gearbox supervisory control and data acquisition data probabilistic risk analysis WT SCADA data gear surface damage time series wind speed generator power statistical variation gear shaft torque random number dataset rotational speed variation lubricant film thickness gear tooth flank contact stress ISO-TR 15144-1

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APPLICATION OF SYSTEM-IDENTIFICATION TECHNIQUES TO MODELING A TURBOGENERATOR

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IEE PROCEEDINGS-D control THEORY AND APPLICATIONS 1989年第3期136卷 113-121页

作者： SWIDENBANK, E HOGG, BW Department of Electrical & Electronic Engineering Queen's University of Belfast Belfast UK

The paper is concerned with the derivation of low-order linear models of a turbogenerator from test data. Data are obtained using a computer-based data-acquisition system, which injects small disturbances to the set points of plant controllers and monitors the response of the unit. The information is processed by identification algorithms, to provide models of the plant dynamics over a range of operating conditions. These state-space models can be obtained online, and provide a basis for multivariable control system design. Tests were performed on a 271 MW unit, onload and connected to the grid. The results include comparisons of plant and model responses and show that accurate models were obtained.

关键词： turbogenerator Simulation, modelling and identification state-space methods a.c. machines computer-based data-acquisition system multivariable control system design Power engineering computing state-space models system identification techniques low-order linear models identification control of electric power systems disturbances 271 MW unit turbogenerators power engineering computing 271 MW control engineering computing control engineering computing machine control set points

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SEAM TRACKER FOR TIG WELDING

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IEE PROCEEDINGS-D control THEORY AND APPLICATIONS 1985年第4期132卷 164-167页

作者： CLARK, S LUCAS, J PARKER, AB Department of Electrical Engineering and Electronics University of Liverpool Liverpool UK

The use of robotic welding in industry is well documented. Further automation will involve the use of sensors with feedback to carry out such tasks as seam tracking or weld penetration monitors. The paper describes a seam tracker for TIG welding. It uses a standard black and white television camera to view the light reflected from the components being welded. The light source is a halogen tungsten lamp. High-speed digitisation using a microcomputer enables rapid correction for any misalignment. All the components used are standard, so that a low-cost system may be produced.

关键词： seam tracking digitisation Robotics Assembling computer vision control applications in assembling television camera industrial robots tracking systems control technology and theory robotic welding control engineering computing position control Spatial variables control TIG welding computerised control Joining processes and welding Industrial applications of IT arc welding

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ENDLESS POLARIZATION control EXPERIMENT WITH 3 ELEMENTS OF LIMITED BIREFRINGENCE RANGE

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ELECTRONICS LETTERS 1986年第25期22卷 1341-1343页

作者： NOE, R Lehrstuhl für Nachrichtentechnik Technische Universität München München West Germany

An automatic endless polarisation control system is presented. A computer controls three birefringent elements and applies simple reset strategies at the range limits.

关键词： control engineering computing optical communication equipment Optical variables control coherent optical communications optical variables control computer control limited birefringence range reset strategies telecommunications computer control Other control applications in telecommunications Optical communication birefringence automatic endless polarisation control system light polarisation

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Efficient acceleration and deceleration technique for short distance movement in industrial robots and CNC machine tools

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ELECTRONICS LETTERS 2000年第8期36卷 766-768页

作者： Jeon, JW Sungkyunkwan Univ Sch Elect & Comp Engn Jangan Gu Suwon 440746 Kyungki Do South Korea

Previous techniques for accelerating and decelerating industrial robots and computer numerical control (CNC) machine tools either cannot be computed in real-time, fail to generate various motion profiles. or cannot fully utilise the maximum values of velocity and acceleration. An efficient technique is proposed that has been designed to generate various motion profiles that fully utilise the maximum values of velocity and acceleration.

关键词： motion control industrial robots machine tools control engineering computing Spatial variables control acceleration technique control technology and theory computerised numerical control deceleration technique control equipment and processes in production engineering Machining motion profiles Robotics short distance movement CNC machine tools maximum values Industrial applications of IT control applications in machining processes and machine tools

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