Compared with the phase-locked loop-based grid-forming control (GFL), the power-synchronized grid-forming double-fed induction generator (GFM-DFIG) has better stability under weak grid conditions. However, for GFM-DFI...
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ISBN:
(纸本)9798350360875;9798350360868
Compared with the phase-locked loop-based grid-forming control (GFL), the power-synchronized grid-forming double-fed induction generator (GFM-DFIG) has better stability under weak grid conditions. However, for GFM-DFIG with the closed-loop control strategy using power outer loop and stator voltage & rotor current inner loop, the multi-loop structure may lead to insufficient damping in the system. In this paper, a modeling and analysis of GFM-DFIG is conducted to quantify the influence of power loop and voltage loop parameters on the active power response characteristics. A strategy combining lead-lag control strategy (LLCS) and proportional feedforward of active power rotor current control strategy (PFA-PRC) is proposed to improve the active power response characteristics of GFM-DFIG. Finally, the effectiveness of the proposed strategy is verified through simulation.
The variable scale of constant power loads (CPLs) can result in diverse perturbations of the AC bus voltage. This article addresses a dynamic tracking control issue in islanded AC microgrids that supply CPLs. First, d...
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ISBN:
(纸本)9798350360875;9798350360868
The variable scale of constant power loads (CPLs) can result in diverse perturbations of the AC bus voltage. This article addresses a dynamic tracking control issue in islanded AC microgrids that supply CPLs. First, disturbance observers are designed to estimate the CPLs, system couplings, and uncertainties. Second, instead of the recursive determination steps typically associated with classical virtual controllers, a onestep tracking framework is proposed by integrating with the estimation results of the disturbance observers. Third, a self-tuning algorithm is proposed to autonomously adjust the scaling gain of the non-recursive controllers, enabling the control system to enhance transient-time control performance while ensuring precise tracking. The effectiveness of the proposed method is validated by Matlab/Simulink.
This paper presents a programming by demonstration (PBD) approach for model predictive interaction control (MPIC). Therein, the user teaches the manipulation task including interactions multiple times. Then, the indiv...
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ISBN:
(纸本)9798350370959;9798350370942
This paper presents a programming by demonstration (PBD) approach for model predictive interaction control (MPIC). Therein, the user teaches the manipulation task including interactions multiple times. Then, the individual demonstrations are aligned using multi-dimensional dynamic time warping and modeled to retrieve nominal paths for the Cartesian pose and the interaction wrench. Based on this model, the reference profiles are segmented by a classification algorithm and a suitable parameterization of a hybrid force/motion control scheme is determined by solving an optimization problem. Finally, the overall task is saved as a sequence of manipulation primitives (MPs) and passed to the model predictive controller which is based on a path-following formulation. The effectiveness of the approach is shown by an experimental validation on a 7 degrees-of-freedom robot.
This paper outlines the application of geometrically constrained extremum-seeking control (ESC) to optimize froth flotation circuits. Froth flotation is a complex process, presenting challenges for model-based optimiz...
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ISBN:
(纸本)9798350370959;9798350370942
This paper outlines the application of geometrically constrained extremum-seeking control (ESC) to optimize froth flotation circuits. Froth flotation is a complex process, presenting challenges for model-based optimization. Furthermore, the process depends on stable operations for performance, with PID control often utilized for this purpose. To address the problem of rigorous modeling and provide high adaptability to changing operational conditions, this paper suggests using geometrically constrained extremum-seeking control as a combined approach to reach optimal performance while stabilizing the process. For this purpose, we developed and performed simulations of a 4-cell flotation circuit. The simulations show how the controller can steer the four cells toward a stable (predefined) operation point and drive it toward an (unknown) optimum.
This paper presents a computationally efficient MPC approach to achieve a nonlinear output regulation using lifting bilinearization. The method uses an internal model to anticipate the future effects of the disturbanc...
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ISBN:
(纸本)9798350370959;9798350370942
This paper presents a computationally efficient MPC approach to achieve a nonlinear output regulation using lifting bilinearization. The method uses an internal model to anticipate the future effects of the disturbance. The output regulation MPC formulation is formulated into an augmented reference scheme to reduce computational complexity. By using lifting bilinearization, the MPC formulation transforms into a linear optimal control problem that can be solved efficiently by well-established convex optimization techniques. The effectiveness of the proposed method is demonstrated in a simulation of a quadrotor system operating in three-dimensional space. The method shows adequate performance in improving the input delay time after observing the system state by approximately 90% and overall computational time by approximately 60%.
Porosity is a critical defect affecting the quality of parts produced by the Directed Energy Deposition (DED) process, with its formation significantly influenced by the melt pool depth (MPD). Despite extensive resear...
ISBN:
(纸本)9798350370959;9798350370942
Porosity is a critical defect affecting the quality of parts produced by the Directed Energy Deposition (DED) process, with its formation significantly influenced by the melt pool depth (MPD). Despite extensive research on controlling melt pool dimensions and temperature, advancements in MPD control are stymied by the inability to directly observe it during the DED process. Here, we present an innovative Iterative Learning control (ILC) framework for enhancing MPD consistency in DED. Leveraging a simulation-based process design, our research showcases the capability of ILC in achieving precise control over MPD, reducing MPD variance between layers. Through comparative analyses, the proposed approach is evidenced to outperform traditional MPD control strategies.
Admittance control is considered an effective method for achieving constant force contact with a manipulator. However, the presence of unknown environmental stiffness and non-uniformity of the contact surface can adve...
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ISBN:
(纸本)9798350360875;9798350360868
Admittance control is considered an effective method for achieving constant force contact with a manipulator. However, the presence of unknown environmental stiffness and non-uniformity of the contact surface can adversely affect the manipulator's ability to maintain constant force contact, leading to jitter or even bouncing during the process. To address this issue, this paper introduces a novel constant force control method using Model Predictive control (MPC) with virtual delayed resonator admittance control. The virtual delayed resonator can effectively mitigate the adverse effects on the admittance controller caused by external interference during the manipulator's contact with the environment, thus reducing jitter. MPC ensures that the manipulator can quickly track the desired constant force required during contact with the environment. Finally, simulation experiments demonstrate that the virtual delayed resonator admittance control method based on MPC exhibits good robustness in constant force tracking tasks and can effectively achieve the desired constant force tracking.
This paper is concerned with the design of event-triggered impulsive control for finite-time stabilization of nonlinear systems under denial-of-service attacks. By establishing a non-Zeno event-triggering mechanism, s...
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ISBN:
(纸本)9798350360875;9798350360868
This paper is concerned with the design of event-triggered impulsive control for finite-time stabilization of nonlinear systems under denial-of-service attacks. By establishing a non-Zeno event-triggering mechanism, some Lyapunov-based sufficient conditions regarding the global finite-time stabilization of the attack-free system are first given, and then an updated event-triggering mechanism is proposed for the local finite-time stabilization of the system under cyber attacks.
IBRs (Inverter-Based Resources) have been widely connected to the conventional power grid, where grid-forming (GFM) control attracts attention for enhancing the grid's stability. This paper uses a test grid model ...
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ISBN:
(纸本)9798350375596;9798350375589
IBRs (Inverter-Based Resources) have been widely connected to the conventional power grid, where grid-forming (GFM) control attracts attention for enhancing the grid's stability. This paper uses a test grid model with 4 GFM inverters connected to the infinite bus and reports its time-domain simulation using a nonlinear state-space model. We show that instability phenomena occur in the grid model and are affected by the parameters of GFM control and the grid's codition.
This paper investigates a novel Fixed-time ESO based self-healing attitude control method for trans-medium aircraft with damaged actuators to achieve the proper contact between the fuselage and the new medium. How to ...
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ISBN:
(纸本)9798350360875;9798350360868
This paper investigates a novel Fixed-time ESO based self-healing attitude control method for trans-medium aircraft with damaged actuators to achieve the proper contact between the fuselage and the new medium. How to reconstruct the fault information has become a great challenge. To solve this problem, a novel self-healing attitude controller is proposed. Firstly, a Fixed-time ESO is constructed to achieve fault diagnosis. Subsequently, a self-healing controller is designed to cope with the actuator fault. Furthermore, the stability analysis indicates the convergence stability of the closed-loop system. Finally, numerical comparison results verify that the attitude can converge in the finite time.
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