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6th International Conference on Computing, Electronics and Communications engineering, iCCECE 2023

作者： Wei, Hua-Liang Balikhin, Michael A. Boynton, Richard J. Walker, Simon N. The University of Sheffield Dept. of Automatic Control and Systems Engineering Sheffield United Kingdom

ISBN: (纸本)9798350340921

Space weather forecasting is of global interest, and its importance is well established in research community and recognized by government, industries and stockholders. Over the past years, many types of predictive models have been developed in the literature. There is a general agreement that forecasting models should not only provide point prediction but also inform the uncertainty associated with the prediction. This study presents a novel method bases on quantile regression and complex dynamic modelling for measuring uncertainties in space weather forecasting. The approach is implemented using Quantile regression and Nonlinear AutoRegressive Moving Average with Exogenous inputs (NARMAX) methods (for short the approach is called Q-NARMAX). The method is applied to Disturbance storm index (Dst) observations to examine its interpretability and capability for uncertainty analysis. Results show that the proposed Q-NARX model can produce excellent predictions of the Dst index, and meanwhile provides a measure for assessing the uncertainty in the forecast. The innovative integration of quantile regression, complex dynamic modelling and nonlinear system identification techniques enables the proposed work to have following attractive advantages and properties: 1) it can produce excellent prediction accuracy for space weather forecasting, 2) it uses transparent models to approximate (represent) black-box systems, enabling to interpret the dependent relationship between space weather indices (system outputs) and their drivers (system inputs), and 3) more importantly, it allows for uncertainty assessment and analysis of models and forecasts. © 2023 IEEE.

关键词： Uncertainty analysis

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Constrained Predictive Current control in dq Frame for a Permanent Magnet Synchronous Machine 28

Constrained Predictive Current Control in dq Frame for a Per...

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28th IEEE International Conference on Emerging Technologies and Factory Automation, ETFA 2023

作者： Costin, Madalin Lazar, Corneliu Gheorghe Asachi Technical University of Iasi Dept.of Automatic Control and Applied Informatics Iasi Romania Dunarea de Jos University of Galati Dept. of Automatic Control and Electrical Engineering Galati Romania

ISBN: (纸本)9798350339918

In the paper, the design and Simulink implementation of a predictive current control structure in dq frame for a permanent magnet synchronous machine (PMSM) are presented. Starting from the multivariable model of the currents in the dq reference frame, first it is decoupled and through the rejection of the disturbance introduced by the back-EMF, two single-input single-output (SISO) systems result whose dynamics are generated by R-L circuits. For these SISO systems, the model predictive control (MPC) algorithms are designed that allow the consideration of physical limitations through constraints The performances of the current control structure with MPC algorithms are compared with those obtained with the conventional PI controllers. © 2023 IEEE.

关键词： Model predictive control

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Effect of Multiple Models of Closed-loop Transfer Functions on Inter-harmonic Oscillation Characteristics of Grid-connected PMSG

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CSEE Journal of Power and Energy systems 2024年第5期10卷 1955-1964页

作者： Jingyi Li Jianjun Yang Xiaorong Xie Haozhi Li Ke Wang Zhaohui Shi Key Laboratory of Far-shore Wind Power Technology of Zhejiang Province Huadong Engineering Corporation LimitedPower ChinaHangzhou 310014China. State Key Lab of Control and Simulation of Power Systems and Generation Equipment(Dept.of Electrical Engineering Tsinghua University)Beijing 100084China.

Establishing a suitable closed-loop transfer function model for the grid-connected PMSG system is the key basis in performing inter-harmonic characteristics *** closed-loop transfer functions can be constructed when different components of the converter controller are taken into ***,the effect of different components of the converter controller on inter-harmonic stability analysis is not *** this paper,the complete transfer function,considering different loops,is first *** on the complete closed-loop transfer function,the DC-link,PLL and voltage forward-feed are removed step by step to derive different closed-loop transfer *** inter-harmonic related poles of different closed-loop transfer functions are further calculated to analyze the effect of closedloop transfer functions on inter-harmonic characteristics ***,by performing time domain simulation,the correctness of the theoretical analysis results is *** results show that under the conditions of a weak AC system,each loop of the converter control system will reduce the stability of the interharmonic in the sub-synchronous frequency range and influence the inter-harmonic oscillation *** transfer function needs to consider the influence of each loop to accurately calculate the inter-harmonic stability of the system.

关键词： Closed-loop transfer function converter controller inter-harmonic characteristics PMSG

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Circuit Design Method of Rate Increase in Operational Amplifiers Based on the MH2XA031 Array Chip and CBJT Technological Routes

Circuit Design Method of Rate Increase in Operational Amplif...

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2024 Conference of Young Researchers in Electrical and Electronic engineering, ElCon 2024

作者： Titov, Alexey E. Kleimenkin, Dmitriy V. Prokopenko, Nikolay N. Southern Federal University Dept. of Automatic Control Systems Rostov-on-Don Russia Don State Technical University Dept. of Scientific Research Dept. of Information Systems and Radio Engineering Rostov-on-Don Russia

ISBN: (纸本)9798350360646

It has been revealed that in the conditions of small-scale production of discrete-analog filters on switched capacitors and ADC-drivers, it is most advisable to design high-speed operational amplifiers (OAs) based on the CBJT technological route and the MH2XA031 array chip, which allows operation in conditions of low temperatures and exposure to radiation. It has been established that most commercially produced O A s provide an average value of the slew rate (SR, up to 200 div 300 ~V / μ s). This is largely due to the limitations of the technologies used, and most importantly, to the irrational design of circuits. We study the maximum performance parameters of a CBJT OA with one integrating capacitor, which ensures the stability of the O A, and a differentiating transient correction circuit, which is implemented by connecting additional small capacitors to the original circuit. In this case, the S R of the O A increases by more than 500 times (up to 4000 ~V / μ s). © 2024 IEEE.

关键词： array chip CBJT operational amplifier slew rate

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Zero-Shot Learning for Intelligent Fault Detection 27

Zero-Shot Learning for Intelligent Fault Detection

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27th International Conference on Automation and Computing, ICAC 2022

作者： Zhang, Siyu Wei, Hua-Liang University of Sheffield Dept. Automatic Control and Systems Engineering Sheffield United Kingdom

ISBN: (数字)9781665498074

ISBN: (纸本)9781665498074

Signal-based fault detection, as an essential technology in many engineering and industrial applications, has received extensive attention. Nevertheless, in a real-world application setting, collecting samples for some specific types of faults may be time-consuming and damaging, implying that samples of unseen faults may be unavailable in the training step. Keeping this in mind, we present a new semantic space-based zero-shot learning (SSB-ZSL) method for fault detection. The implementation of the method comprises three phases: feature extraction, human-defined semantic space, and a feature embedding model to address this issue. To evaluate the proposed method, we carry out experiments on two real datasets: a vibration-based rolling element bearing dataset from Case Western Reserve University, and an acoustic-based air compressor fault dataset. The results are promising and significantly better than that given by the compared state-of-the-art methods, showing that the proposed method can effectively detect unseen types of faults in the absence of their samples. © 2022 IEEE.

关键词： Fault detection

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Investigating the impacts of urban speed limit reduction through microscopic traffic simulation

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Communications in Transportation Research 2021年第1期1卷 144-157页

作者： Mánuel Gressai Balázs Varga Tamás Tettamanti István Varga Dept.of Control for Transportation and Vehicle Systems Fac.of Transportation Engineering and Vehicle EngineeringBudapest University of Technology and Economics

Road traffic congestion has become an everyday phenomenon in today's cities all around the *** reason is clear:at peak hours,the road network operates at full *** this way,growing traffic demand cannot be satisfied,not even with traffic-responsive signal *** external impacts of traffic congestion come with a serious socio-economic cost:air pollution,increased travel times and fuel consumption,stress,as well as higher risk of *** tackle these problems,a number of European cities have implemented reduced speed limit ***,a general urban speed limit measure is in preparatory phase in Budapest,*** this context,a complex preliminary impact assessment is needed using a simulated *** typical network parts of Budapest were analyzed with microscopic traffic *** results revealed that speed limits can affect traffic differently in diverse network types indicating that thorough examination and preparation works are needed prior to the introduction of speed limit reduction.

关键词： Speed limit reduction Microscopic traffic simulation Emission Traffic analysis

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High-Speed CBJT Operational Amplifier with Dual-Input-Stage Subclass Input Stage 3

High-Speed CBJT Operational Amplifier with Dual-Input-Stage ...

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3rd IEEE International Conference on Problems of Informatics, Electronics and Radio engineering, PIERE 2024

作者： Kuznetsov, Dmitry V. Titov, Alexey E. Sergeenko, Marsel A. Prokopenko, Nikolay N. Don State Technical University Dept. of Scientific Research Dept. of Information Systems and Radio Engineering Rostov-on-Don Russia Southern Federal University Dept. of Automatic Control Systems Rostov-on-Don Russia Don State Technical University Dept. of Information Systems and Radio Engineering Rostov-on-Don Russia

ISBN: (纸本)9798331516321

A significant disadvantage of classical operational amplifiers with two complementary differential stages in parallel (on the inputs) is that here the slew rate has small values (50-80 V/μs). This is due to the non-linear mode of operation of the input differential stage. In this paper, a new circuit technique for slew rate enhancement in CBJT operational amplifiers of this subclass is discussed. Due to the use of special circuitry of the input differential stage, the process of recharging of the integrating correction capacitance in non-inverting and inverting operational amplifier inclusions is forced. This ultimately improves the performance of the operational amplifier in the large-signal mode. The purpose and originality of this paper is to investigate a new circuit solution of operational amplifier, in which by introducing differentiating transient correction circuits, slew rate is improved by two orders of magnitude. This does not require nanometer-scale technological processes, and the operational amplifier transistors can operate with emitter currents on the order of 100 μA. It is possible to build micro-power operational amplifier on the basis of the proposed circuit design technique, including CBJT and CCMOS transistors. Computer simulations show that for micron CBJT silicon technological processes, the SR of the proposed operational amplifier in non-inverting inclusion (at 100% feedback) increases from 80 to 10000 V/μs, i.e., more than two orders of magnitude. © 2024 IEEE.

关键词： Operational amplifiers

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Method for Improving the Performance of Operational Amplifier with HA2700 Microchip Architecture

Method for Improving the Performance of Operational Amplifie...

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2024 International Conference on Electrical engineering and Photonics, EExPolytech 2024

ISBN: (纸本)9798350388879

A circuit technique for increasing the maximum output voltage slew rate (SR) of an integrated operational amplifier (OpAmp) with the HA2700 microchip architecture based on the modernization of the input differential stage (DS) is considered. An OpAmp architecture is proposed in which the influence of parasitic capacitances of DS reference current sources and capacitances on the transistor substrate on the SR is minimized. This allows the use of micron technological processes in the fabrication of CBJT OpAmps, which are widely used to improve the radiation resistance of microchips. Computer simulation of the proposed OpAmp is performed, which shows that the SR of the new circuit differs from the SR of the well-known serial OpAmp by more than 40 times and reaches values of about 800 V/μs at the emitter current of the input transistors of the DC in the range of up to 80-100 μA. The developed OpAmp is recommended for practical use in discrete-to-analog filters on switched capacitors. © 2024 IEEE.

关键词： Operational amplifiers

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Design of Output and Impacts control systems

Design of Output and Impacts Control Systems

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2023 International Russian Automation Conference, RusAutoCon 2023

作者： Gaiduk, Anatoly Prokopenko, Nikolay Chumakov, Vladislav Southern Federal University Scientific Design Office Robotics and Control Systems Taganrog Dept. of Automatic Control Systems Rostov-on-Don Russia Don State Technical University Dept. of Scientific Research Dept. of Information Systems and Radio Engineering Rostov-on-Don Russia

ISBN: (纸本)9798350345551

To design linear control systems a new method is suggested on the basis of the principle of output and impacts control. The main difference of this principle consists in the use of only measurable variables and separate operators for each input signal of the control device. The design problem has a solution if the plant is completely controllable, and at least the controllable variable is measured. The suggested approach makes it possible to eliminate the well-known contradiction between the accuracy and stability of systems with control on deviation, and to provide the required astatism orders or selective invariance to the external actions. At the same time, the conditions of ensuring the direct indicators of the transient quality and the physical implementation of the control device are taken into account. The coefficients of the equation of the output and impacts control device are determined by solving a system of linear algebraic equations. The control device can be implemented on the basis of either operational amplifiers or sufficiently high-speed digital automation tools. The suggested method can be applied for designing high-quality linear control systems for various purposes. © 2023 IEEE.

关键词： Operational amplifiers

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High-Speed Operational Amplifier Based On Complementary 'Folded' Cascodes 3

High-Speed Operational Amplifier Based On Complementary 'Fol...

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3rd IEEE International Conference on Problems of Informatics, Electronics and Radio engineering, PIERE 2024

作者： Kuznetsov, Dmitry V. Kleimenkin, Dmitriy V. Prokopenko, Nikolay N. Titov, Alexey E. Don State Technical University Dept. of Scientific Research Dept. of Information Systems and Radio Engineering Rostov-na-Donu Russia Don State Technical University Dept. of Information Systems and Radio Engineering Rostov-na-Donu Russia Southern Federal University Dept. of Automatic Control Systems Rostov-na-Donu Russia

ISBN: (纸本)9798331516321

A significant disadvantage of classical operational amplifiers with a complementary 'folded' cascode is that in the dynamic overload mode of the input differential stage, the maximum output current of the 'folded' cascode is tightly coupled to the currents of the current-stabilizing bipoles that establish its static mode. This prevents (under the static current consumption limitations of the operational amplifier) a fast recharge of the integrating correction capacitor, which limits the maximum slew rate of the output voltage. The paper discusses new circuit solutions of CBJT operational amplifier based on complementary 'folded' cascodes and input differential stage of dual-input stage subclass to increase slew rate from 215 V/μs to 8000 V/μs level. The problem solved here is to provide higher levels of 'folded' cascode output current during the transient edge. This effect is achieved by introducing three additional small capacitance correction capacitors into the circuit. It is possible to introduce a special current limiting resistor in series with the third additional capacitor to reduce overshoot during the transient edge. The proposed modifications of operational amplifier have significant advantages in comparison with the classical ones based on complementary 'folded' cascodes in terms of slew rate level. Results of computer modeling of the operational amplifier in LTSpice environment for silicon CBJT technological process with micron topological norms are presented. © 2024 IEEE.

关键词： Operational amplifiers

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