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Analysis of Maximum PowerPoint Tracking (MPPT) Adaptability in Inverters of the Three-Phase Photovoltaic Systems Integrated into the Electrical Grid of Congo-Brazzaville

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Journal of Power and Energy engineering 2024年第11期12卷 125-152页

作者： Rostand Martialy Davy Loembe Souamy Mavie Grace Mimiesse Brel Levallois Ndzah Yombi Zonzolo Guoping Jiang Wanghong Hua Xubao Wen Laboratory of Electrical and Electronic Engineering (LGEE) National Higher Polytechnic School Marien Ngouabi University Brazzaville Republic of the Congo National Institute of Research in Natural and Exact Sciences (IRSEN) Brazzaville Republic of the Congo College of Automation and Artificial Intelligence Nanjing University of Posts and Telecommunications Nanjing China Laboratory of Control Theory and Control Engineering Hohai University College of Energy and Electrical Engineering Nanjing China Jiangsu Provincial Key Laboratory for Novel Technology Department of Computers Sciences and Technology Nanjing University Nanjing China

This paper investigates the adaptability of Maximum Power Point Tracking (MPPT) algorithms in single-stage three-phase photovoltaic (PV) systems connected to the grid of Congo-Brazzaville and compares the attributes of various conventional, significance and novelty of controller system of the proposed of method and improved Incremental Conductance algorithms, Perturbation and Observation Techniques, and other Maximum Power Point Tracking (MPPT) algorithms in normal and partial shading conditions. Performance evaluation techniques are discussed on the basis of the dynamic parameters of the PV system although the control of this structure is relatively advanced technology but the conversion efficiency is difficult to improve due to increase in transformation series. The single stage topology has a simple topology with high reliability and efficiency because of high power consumption, but control algorithm is more complex because of its power convert main circuit a new strategy is being developed. This paper describes a method for maximum power point tracking (MPPT) in the single-stage and three single-phase PV grid-connected system. In the paper, the nonlinear output characteristics of the PV including I-V & P-V are obtained in changed solar insulations or temperature based on MATLAB, and the MPPT algorithm which is based on the P & O algorithm method, compared with Incremental Conductance, is also described, a dimensioning of the impedance adapter for better stabilization. A comparison SPWM and SVPWM control methods in the case of a grid connection applied to the electrical grid of Republic of Congo and their influences on the dynamic performance of the system and their impact in reducing the harmonic rate for better injection into the grid. The simulation model of three single-phase PV grid-connected system is built, and simulation results show the MPPT algorithm has excellent dynamic and static performances, which verifies the Incremental Conductance is effective f

关键词： Photovoltaic Array Congo Maximum Power Point Tracking Perturbation Observation Incremental Conductance Partial Shading Conditions Performance Evaluation State Flow

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Simulation of High-Definition Pixel-Headlights 15th

Simulation of High-Definition Pixel-Headlights

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15th International Symposium on Visual Computing, ISVC 2020

作者： Waldner, Mirko Bertram, Torsten TU Dortmund University Institute of Control Theory and Systems Engineering Dortmund Germany

ISBN: (纸本)9783030645557

This contribution presents a novel algorithm for real-time simulation of adaptive matrix- and pixel-headlights for motor vehicles. The simulation can generate the light distribution of a pair of pixel-headlamps with a resolution of more than one and a half million matrix-elements per light module in real-time. This performance is achieved by dividing the superposition process of the matrix-light-sources into an offline and an online part. The offline part creates a light database that is used by the online component to generate the illumination in memory access efficient way. For an ideal pixel-headlight the run-time of the approach is nearly constant by increasing the number of matrix-lights. This contribution evaluates the visual quality of the simulation. It also presents the changes in the run-time for different pixel-headlamp resolutions and solid angle discretizations. © 2020, Springer Nature Switzerland AG.

关键词： Headlights

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High-order robust dynamic surface control for uncertain nonlinear systems based on fully actuated system approach

High-order robust dynamic surface control for uncertain nonl...

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Fully Actuated System theory and Applications (CFASTA), Conference on

作者： Yongqiang Xiao Guangbin Cai Mingzhe Hou Xunliang Yan Department of Missile Engineering Rocket Force University of Engineering Xi’an China Center for Control Theory and Guidance Technology Harbin Institute of Technology Harbin China School of Astronautics Northwestern Polytechnic University Xi’an China

In this paper, a robust dynamic surface control method is designed for high-order strict feedback systems with nonlinear uncertainties. Based on the idea of dynamic surface control, a series of first-order low-pass filters are introduced to obtain the derivative of the virtual control law, and the controller is designed directly for each higher-order subsystem without converting it into the first-order one, hence is more concise and efficient. It is proved by the Lyapunov stability theory that the tracking error can converge to a small domain around zero. The effectiveness of the proposed algorithm is also verified by a simulation with the flexible joint robotic arm system.

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Trajectory Tracking control for a Class of 2×2 Hyperbolic PDE-ODE Systems

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IFAC-PapersOnLine 2021年第9期54卷 416-421页

作者： A. Irscheid N. Gehring J. Rudolph Chair of Systems Theory and Control Engineering Saarland University 66123 Saarbrücken Germany Institute of Automatic Control and Control Systems Technology Johannes Kepler University 4040 Linz Austria

This paper introduces an approach to trajectory tracking control of linear 2×2 hyperbolic partial differential equations (PDEs) actuated at one boundary and coupled with ordinary differential equations (ODEs) at the other one. Well-known state feedback methods that benefit from so-called backstepping coordinates are limited to the case of boundary conditions consisting of linear time-invariant ODEs. In a first step, the new approach is introduced for this restricted class of linear dynamic boundary conditions. It is shown that tracking control is immediately achieved by a surprisingly simple, yet elegant, modification of a stabilizing state feedback. Then, a direct extension for solving trajectory tracking problems for a class of nonlinear ODEs at the unactuated boundary is discussed. Numerical studies underline the performance of the proposed method.

关键词： tracking control PDE-ODE systems boundary control predictor feedback distributed parameter systems hyperbolic systems

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Predictive Diagnostics of Power Generating Equipment Failures Based on Neural Network Technology

Predictive Diagnostics of Power Generating Equipment Failure...

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Neural Networks and Neurotechnologies (NeuroNT), II International Conference on

作者： Ivan V. Nekrasov Yurij D. Konstantinovskij Nikolay S. Kukin Laboratory of Schedule Theory and Discrete Optimization V.A. Trapeznikov Institute of Control Sciences RAS Moscow Russia Aerospace Faculty Bauman Moscow State Technical University Moscow Russia Autonomous Non-Profit Organization “Institute of Engineering Physics” Serpukhov Russia

ISBN: (数字)9798350363739

ISBN: (纸本)9798350363746

This paper is covers basic problems of creating a predictive diagnostic system for assets and units of a heating power plant based on a fully connected neural network. The research confirms frequent situation when the network cannot be properly trained against typical failures due to lack of statistical data associated with each type of failure. In order to solve the problem we implement the idea of utilizing additional data that belongs to pre-fault time period and/or corresponds to warning alarms thrown before the failure itself. The primary analysis shows that existing databases from industrial enterprises contain significant amount of pre-fault data. We introduce a procedure of creating and preprocessing the training set based on pre-fault data measurements. The procedure includes basic stages of detecting cross-correlation between measured parameters, defining each parameter variation/range and choosing the data most applicable for neural network training. The result of training the network and testing the diagnostic system on real data taken from the turbine's feeding pump located at the heat power plant. Based on the real result demonstrated we certify positive outcome of the designed predictive diagnostic system and share some future improvements to be done.

关键词： Training Heating systems Heat pumps Databases Data models Noise measurement Biological neural networks

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Consensus of Uncertain Euler-Lagrange Multi-agent Systems under Switching Digraphs and Disturbances

Consensus of Uncertain Euler-Lagrange Multi-agent Systems un...

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Automation, control and Robotics engineering (CACRE), International Conference on

作者： Lei Ju Zhiwei Wang Anqing Wang Xiaotong Zhou College of Marine Electrical Engineering Dalian Maritime University Dalian China College of Intelligent Systems Science and Engineering Harbin Engineering University Harbin China Center for Control Theory and Guidance Technology Harbin Institute of Technology Harbin China

This paper focuses on exploring the problem of achieving leader-follower consensus in uncertain Euler-Lagrange multi-agent systems, which are subjected to disturbance, and operate on switched digraph. To be more precise, the system dynamics are characterized by uncertainties that can be linearly parameterized, and the disturbances that are considered are those originating from the leader system. A novel adaptive distributed control strategy is proposed to overcome the difficulties of suppressing disturbances and achieving consistency under the condition of joint connectivity of switched digraphs. By using Lyapunov stability theory and the generalized Barbalat's lemma, it is proved that the uncertain Euler-Lagrange multi-agent systems achieves state consensus asymptotically with the proposed distributed adaptive control protocol. The efficacy of the adaptive distributed control strategy proposed in the paper is validated by presenting a case study involving a system composed of four double-link manipulators.

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A Robust Time-Delay Approach to Continuous-Time Extremum Seeking for Multi-Variable Static Map

A Robust Time-Delay Approach to Continuous-Time Extremum See...

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IEEE Conference on Decision and control

作者： Xuefei Yang Emilia Fridman Center for Control Theory and Guidance Technology Harbin Institute of Technology Harbin China National Key Laboratory of Modeling and Simulation for Complex Systems School of Electrical Engineering Tel-Aviv University Israel

In this article, we introduce a time-delay approach to gradient-based extremum seeking (ES) in the continuous domain for n-dimensional (nD) static quadratic maps. As in the recently introduced (for 2D maps in the continuous domain), we transform the system to the time-delay one (neutral type system). This system is $\mathbf{O}(\varepsilon)$ . ‘perturbation of the averaged linear ODE system. We further explicitly present the neutral system as the linear ODE, where $\mathrm{O}(\varepsilon)$ -terms are considered as disturbances with distributed delays of the length of the small parameter $\varepsilon$ . Quantitative (for uncertain map) and qualitative (for unknown map) practical stability analyses are provided by employing a variation of constants formula that greatly simplifies the results compared to the previously used Lyapunov-Krasovskii (L-K) method. The new approach also simplifies the conditions and improves the results. Examples from the literature illustrate the efficiency of the new approach, allowing essentially large uncertainty of the Hessian matrix with bounds on $\varepsilon$ that are not too small.

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Phase transition and piezoelectric property of (Ag,K)NbO_(3) ceramics

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Journal of Materiomics 2022年第4期8卷 863-872页

作者： Lin Chen Mingyuan Zhao Jing Wang Suwei Zhang Fuhua Sun Lei Zhao Key Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei Province College Physics Science and TechnologyHebei UniversityBaoding071002China Key Laboratory of Mechanics and Control of Mechanical Structures College of Aerospace EngineeringNanjing University of Aeronautics and AstronauticsNanjing210016China Center for Advanced Measurement Science National Institute of MetrologyBeijing100029China Institute for Advanced Materials Hubei Normal UniversityHuangshi435002China

AgNbO_(3) is an antiferroelectric (AFE) material with double hysteresis loop. Both the antiferroelectricityand ferroelectricity can be enhanced by doping. Herein, the ferroelectricity of AgNbO_(3) ceramics wasenhanced via K-doping and the phase diagram of the (Ag_(1-x)K_(x))NbO_(3) ceramics was upgraded. In details,(Ag_(1-x)K_(x))NbO_(3) ceramics are ferrielectric (FIE) M1 phase as x=5.00-5.50 mol% and ferroelectric (FE) Ophase as x=5.75-6.00 mol% before poling, and FE O phase as x=5.00-6.00 mol% after poling at roomtemperature. With increasing temperature, (Ag_(1-x)K_(x))NbO_(3) ceramics show the phase evolutions from FIEM1, AFE M2 to paraelectric (PE) T phase at x=5.00-5.50 mol% and from FE O, FE T to PE T phase at x=5.75-6.00 mol% before poling, and from FE O, FE T to PE T phase at x=5.00-6.00 mol% after *** d33 values of 180 pC/N and 285 pC/N are obtained at the FE O-FE T and FE T-PE T phase *** work sheds light on a novel and promising lead-free piezoelectric system.

关键词： (Ag_(1-x)K_(x))NbO_(3)ceramics Phase diagram Piezoelectric property

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Bounded Extremum Seeking for Single-Variable Static Map with Large Measurement Delay via Time-Delay Approach to Averaging

Bounded Extremum Seeking for Single-Variable Static Map with...

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IEEE Conference on Decision and control

作者： Xuefei Yang Emilia Fridman Bowen Zhao Center for Control Theory and Guidance Technology Harbin Institute of Technology Harbin China National Key Laboratory of Modeling and Simulation for Complex Systems School of Electrical Engineering Tel-Aviv University Israel

In this paper, we present a time-delay approach to gradient-based bounded extremum seeking (ES) with large measurement constant delay, for an unknown single-input static quadratic map. We assume that the extremum point and the Hessian $H$ belong to known intervals, whereas the sign of $H$ is known. We apply a time-delay approach to the bounded ES system and arrive at the neutral type system with a nominal linear delayed system. We present the latter system as a retarded one and employ variation of constants formula for practical stability analysis. Explicit conditions in terms of simple scalar inequalities depending on tuning parameters and delay are established to guarantee the practical stability of the bounded ES control systems. Given any delay and neighborhood of the extremum point and through the solution of the constructed inequalities, we find lower bounds on the dither period that ensures the practical stability.

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Exploiting symmetries in active set enumeration for constrained linear-quadratic optimal control

arXiv

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arXiv 2023年

作者： Mitze, Ruth Kvasnica, Michal Mönnigmann, Martin Automatic Control and Systems Theory Ruhr-Universität Bochum Bochum Germany Institute of Information Engineering Automation and Mathematics Faculty of Chemical and Food Technology Slovak University of Technology Bratislava Slovakia

This paper studies symmetric constrained linear-quadratic optimal control problems and their parametric solutions. The parametric solution of such a problem is a piecewise-affine feedback law that can be equivalently expressed as a set of active sets. We show symmetries of the optimal control problem entail symmetries of the active sets, which can be used to simplify finding the set of active sets considerably. Specifically, we improve a recently proposed method for the dynamic-programming-based enumeration of all active sets. The achieved reduction of the computational effort is illustrated with an example. © 2023, CC BY-NC-ND.

关键词： Quadratic programming

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