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A Simplified Guide to control algorithms for Grid Converters in Renewable Energy Systems

ENERGIES 2024年第18期17卷 4690-4690页

作者： Dmitruk, Krzysztof Bialystok Tech Univ Fac Elect Engn Wiejska 45D PL-15351 Bialystok Poland

This article provides an overview of control algorithms for grid-connected converters in renewable energy systems, demonstrating their relevance and potential for further research. A common issue among authors of scientific works is the lack of a wide range of conducted research. Often, the results showing the operation of the developed algorithms in transient states or under abnormal supply conditions (such as asymmetries and distortions) are missing. This significantly reduces the ability to compare developed solutions, making it difficult to choose the appropriate control method for future research. The article suggests which control algorithm for power converters is best suited for research considering various factors.

关键词： control algorithm grid converter PV inverter linear control method non-linear control method predictive control method renewable energy systems

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Synthesis of control algorithms for providing independence of the subsystems of a multivariable object

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JOURNAL OF COMPUTER AND SYSTEMS SCIENCES INTERNATIONAL 1996年第3期34卷 81-97页

作者： Medvedev, VS Romanova, RA

For one class of multivariable linear interlinked objects, a calculation is given for compensation of the dynamic mutual interaction between separate subsystems. algorithms are developed for synthesizing the control law for a multivariable linear system. The effectiveness of the control algorithms is illustrated by synthesis of the control law for a local regulator, which provides the desired coefficients for the characteristic equations for separate orders of movement by the manipulator.

关键词： control algorithm manipulator

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Adaptive Estimation and control algorithms for Certain Independent control Axis Misalignments

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JOURNAL OF GUIDANCE control AND DYNAMICS 2014年第1期37卷 72-85页

作者： Mercker, Travis H. Akella, Maruthi R. US Air Force Res Labs Wright Patterson AFB OH 45433 USA Univ Texas Austin Dept Aerosp Engn & Engn Mech Austin TX 78712 USA

Actuators are often assumed to be perfectly aligned when designing for a stable closed-loop system. In practice, small actuator misalignments can cause the system to perform poorly, or worse, become unstable. Consequently, adaptive observers can be introduced that build online estimates for the unknown misalignments and recover closed-loop stability. In this paper, the problem where the control axes are independently misaligned in three dimensions is considered. A study of the problem indicates a fundamental geometric difference between in-plane and out-of-plane misalignments. Accordingly, special attention is paid to the case where two axes are independently misaligned. New nonlinear adaptive observers are introduced for both the in-plane and out-of-plane problems that guarantee that the misalignment axis estimates remain unit vectors. Furthermore, a Lyapunov-like stability analysis is performed to show convergence of the misalignment estimates to their true values for a wide range of misalignment angles. In addition, a novel control system is developed for a representative dynamic system containing the aforementioned actuator misalignments that ensures perfect asymptotic tracking of prescribed reference trajectories. Also, an axis decoupling method is described that helps alleviate some of the inherent issues in the estimation problem. Detailed proofs and numerical simulations are presented to help illustrate the technical aspects of the work.

关键词： Model Reference Adaptive control Actuators control algorithm Numerical Simulation control Systems Extended Kalman Filter Convergence Analysis control Moment Gyros Monte Carlo Simulation Numerical Analysis

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SimApi, a smartgrid co-simulation software platform for benchmarking building control algorithms

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SOFTWAREX 2019年 9卷 271-281页

作者： Pallonetto, Fabiano Mangina, Eleni Milano, Federico Finn, Donal P. Univ Coll Dublin Energy Inst Dublin Ireland Univ Coll Dublin Sch Comp Sci Dublin Ireland Univ Coll Dublin Sch Elect & Elect Engn Dublin Ireland Univ Coll Dublin Sch Mech & Mat Engn Dublin Ireland

This paper describes an open source smart grid software infrastructure for co-simulation between cloud-based energy management systems and a building energy model. The core component of the infrastructure is an API, which provides a protocol abstraction as a decoupling mechanism between the control algorithms and the building, thereby facilitating the development and testing of intelligent controllers. The open-source infrastructure can be utilised for the development and benchmarking of smart grid demand response algorithms aimed at reducing the energy consumption and the carbon footprint of buildings, while facilitating the integration of renewable energies into the power system. (C) 2019 The Authors. Published by Elsevier B.V.

关键词： Smart grid control algorithm Building simulation software

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Robustness evaluation of control algorithms for a long-stroke fast tool servo

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JOURNAL OF MANUFACTURING PROCESSES 2022年 80卷 458-468页

作者： Gong, Zheng Huo, Dehong Niu, Zengyuan Chen, Wanqun Cheng, Kai Newcastle Univ Sch Engn Newcastle Upon Tyne NE1 7RU England Jiangsu Ind Technol Res Inst Uptech Kunshan 215300 Jiangsu Peoples R China Soochow Univ Sch Electromech Engn Suzhou 215031 Peoples R China Brunel Univ Sch Engn & Design London UB8 3PH England

Fast tool servo (FTS) is an effective freeform surface machining technology in precision machining. The robustness of the FTS control algorithm is an important factor influencing the quality of machining. In this paper, an advanced PID control algorithm and a hybrid control algorithm are tested on a Lorentz force FTS. A mathematical simulation model is built according to the system characteristics. The model is verified by the system identification model and used for the simulation of the system's motion under disturbance. Simulation results show that the advanced PID control results in more significant differences in tracking error, amplitude error, and phase errors than the hybrid control. Four machining experiments are designed and conducted. The motion profile results from simulations and experiments show that the hybrid control (<0.5% tracking error) has better robustness than advanced PID control (>1.5% tracking error). In addition, the hybrid control exhibits rapid response speed. From the 3D profile of the machined microstructured surface, the hybrid control helps to achieve better form accuracy in the workpiece than the advanced PID control.

关键词： Fast tool servo control algorithm Tracking error Robustness Microstructured surface

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Practical Implementation of Attitude-control algorithms for an Underactuated Satellite

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JOURNAL OF GUIDANCE control AND DYNAMICS 2012年第1期35卷 40-50页

作者： Horri, Nadjim M. Palmer, Phil Univ Surrey Surrey Space Ctr Guildford GU2 7XH Surrey England

The challenging problem of controlling the attitude of satellites subject to actuator failures has been the subject of increased attention in recent years. The problem of controlling the attitude of a satellite on all three axes with two reaction wheels is addressed in this paper. This system is controllable in a zero-momentum mode. Three-axis attitude stability is proven by imposing a singular quaternion feedback law to the angular velocity trajectories. Two approaches are proposed and compared to achieve three-axis control: The first one does not require angular velocity measurements and is based on the assumption of a perfect zero momentum, while the second approach consists of tracking the desired angular velocity trajectories. The full-state feedback is a nonlinear singular controller. In-orbit tests of the first approach provide an unprecedented practical proof of three-axis stability with two control torques. The angular velocity tracking approach is shown to be less efficient using the nonlinear singular controller. However, when inverse optimization theory is applied to enhance the nonlinear singular controller, the angular velocity tracking approach is shown to be the most efficient. The resulting switched inverse optimal controller allows for a significant enhancement of settling time, for a prescribed level of the integrated torque.

关键词： Small Satellites control algorithm Attitude Stabilization Spin Stabilisation Full State Feedback Quaternions Actuators Gain Scheduled control Numerical Simulation Hamilton Jacobi Bellman (HJB) Equations

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Development of control algorithms for the Orbital Motion of a Small Technological Spacecraft with a Shadow Portion of the Orbit

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MICROGRAVITY SCIENCE AND TECHNOLOGY 2020年第5期32卷 941-951页

作者： Sedelnikov, A., V Orlov, D., I Samara Natl Res Univ Samara Russia

The paper proposes algorithms for controlling the orbital motion of a small spacecraft for executive bodies with constant and variable thrust. The developed algorithms are aimed at neutralizing the influence of temperature shock on the level of microaccelerations in the area of technological equipment. The influence of the most significant part of the disturbances associated with a change in the size of large elastic elements as a result of temperature shock is leveled out. The developed algorithms can be used in the implementation of technological spacecraft projects such as the "Foton", "Bion", SJ series as well as promising small spacecraft such as Vozvrat-MKA.

关键词： control algorithm Small spacecraft Microacceleration Gravitationally sensitive processes

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In vivo evaluation of two adaptive Starling-like control algorithms for left ventricular assist devices

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BIOMEDICAL ENGINEERING-BIOMEDIZINISCHE TECHNIK 2021年第3期66卷 257-266页

作者： Habigt, Moriz A. Gesenhues, Jonas Ketelhut, Maike Hein, Marc Duschner, Patrick Rossaint, Rolf Mechelinck, Mare Univ Hosp RWTH Aachen Anaesthesiol Clin Pauwelsstr 30 D-52074 Aachen Germany Rhein Westfal TH Aachen Inst Automat Control Aachen Germany

The implantation of a left ventricular assist device (LVAD) is often the only therapy in terminal heart failure (HF). However, despite technical advancements, the physical fitness of the patients is still limited. One strategy to improve the benefits of ventricular assist device therapy might be the implementation of load adaptive control strategies. Two control strategies and a constant speed controller (CS) were implemented in an acute animal model where four healthy pigs received LVAD implantations. In the first strategy (preload recruitable stroke work [SW] controller, PRS), the desired pump work was computed in relation to the end-diastolic volume. In the second strategy, the controller was programmed to keep a fixed ratio of the mean hydraulic power of the assist device to the mean hydraulic power of the left ventricle (power relation controller, PR). Preload reduction, after-load increase experiments and short-term coronary artery occlusions were conducted to test the behavior of the control strategies under variable conditions. Within the experiments, the PR controller demonstrated the best preload sensitivity. The PRS controller had the best response to an increased afterload and to a reduced ventricular contractility in terms of effectively preventing ventricular overloading and increasing VAD support. No significant differences in systemic flow were observed.

关键词： animal model control algorithm load intervention physiologic ventricular assist device

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Analysis and optimization of control algorithms for RSS^TSP for horizontal well drilling

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JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY 2018年第4期8卷 1069-1078页

作者： Zhang, Li Gang Liu, G. R. Li, Wei Li, Shi Bin Northeast Petr Univ Dept Petr Engn Daqing Peoples R China Hebei Univ Technol Sch Mech Engn Tianjin Peoples R China Univ Cincinnati Dept Aerosp Engn & Engn Mech Cincinnati OH 45220 USA

Steering control algorithm plays an important role in a rotary steerable system for horizontal well drilling, including the determination of the well trajectory, vibrations, stability, durability among other variables. This work develops a control algorithm for three static push-the-bit rotary steerable systems (RSSTSP) (TSP is the abbreviation of three static push-the-bit). Based on the structure, mechanism, and working process of the RSSTSP, mechanical and mathematical models are proposed to determine the required steering force (amplitude and direction) to move the drill bit from a point to another. Additional equations are constructed to overcome the non-uniqueness and then compute the optimal forces for the three pads to achieve the required steering force. Moreover, a new control algorithm of RSSTSP is developed, considering the steerability, stability, durability, favorable area, unfavorable area, maximum usable magnitude of steering force. The proposed control algorithm is also applied to a new RSSTSP and tested on a GU-693-P102 well for validation. It is found that each pad force changes smoothly, the drilling tool is stable, and the well trajectory is consistent with the design, demonstrating that our proposed control algorithm is robust and effective for RSSTSP for horizontal well drilling.

关键词： Horizontal well drilling Rotary steerable system (RSSTSP) control algorithm Steering force Pad force Dogleg

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Hydrodynamic response on trajectory tracking of a tethered underwater robot system under hybrid control algorithms of umbilical cable and propellers

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DISCOVER APPLIED SCIENCES 2024年第9期6卷 1-18页

作者： Chen, Dongjun Wu, Jiaming Yangzhou Polytech Inst Dept Architecture Engn Huayang West Rd 199 Yangzhou 225127 Peoples R China South China Univ Technol Dept Naval Architecture & Ocean Engn Guangzhou 510640 Peoples R China

A hydrodynamic control model is established in attention to coupling relationships among cable, propellers and robot body of a tethered underwater robot system. In this model the governing equations of umbilical cable and the robot are firstly introduced, then supplementary conditions are coupled into the equations to forming the dynamic mathematical model;finally a hybrid control strategy based on feed-forward negative feedback method for the cable and PID rule for the propellers are integrated in the mathematical model for composing the whole hydrodynamic control model. Both the mathematical model and the control algorithms are proved to be effective and reliable through comparing simulation with the experimental data in existed references. Based on the numerical model constructed in this paper, trajectory tracking of a tethered underwater robot system in different motion combinations are numerically simulated through computational fluid dynamics method. In the numerical simulations, finite difference method is used to solving the kinematic parameters of the mathematical model, while finite volume method is applied on calculating the hydrodynamic forces under a hybrid control manipulations. The robot motion in vertical direction is determined primary by feed-forward negative feedback strategy of adjusting the cable length, while the horizontal movement of the robot is controlled mainly through PID algorithm;The hydrodynamic loading on the robot body are influenced by the flow fields around the robot. Established the coupling equations with considering dynamic behaviors among propellers, umbilical cable and robot *** the conversion relation which unrelated to objective factors between the rotating speeds of propellers and the corresponding *** the changing rules of hydrodynamic loading on the underwater robot under a hybrid control strategy.

关键词： Motion equations Umbilical cable Underwater robot Hydrodynamic response control algorithm Trajectory tracking

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