A distributed six-degree-of-freedom (6-DOF) cooperative control for multiple spacecraft formation is investigated considering parametric uncertainties, external disturbances, and time-varying communication delays. Uni...
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A distributed six-degree-of-freedom (6-DOF) cooperative control for multiple spacecraft formation is investigated considering parametric uncertainties, external disturbances, and time-varying communication delays. Unit dual quaternions are used to describe the kinematics and dynamics models of the 6-DOF relative motion of the spacecraft. A distributed coordinated controller based on dual quaternions with time-varying communication delays is proposed. The unknown mass and inertia, as well as unknown disturbances, are then taken into account. An adaptive coordinatedcontrol law is developed by combining the coordinatedcontrol algorithm with an adaptive algorithm to compensate for parametric uncertainties and external disturbances. The Lyapunov method is used to prove that the tracking errors converge globally asymptotically. Numerical simulations show that the proposed method can realize cooperative control of attitude and orbit for the multi-spacecraft formation.
As the communication delays in smart grid are considered, the novel secondary voltage and frequency restoration, the optimal active power sharing, and the accurate reactive power sharing protocols are proposed in this...
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As the communication delays in smart grid are considered, the novel secondary voltage and frequency restoration, the optimal active power sharing, and the accurate reactive power sharing protocols are proposed in this paper. The Lyapunov-Krasovskii functions are used to analyze the stability of our proposed distributed secondary control schemes. Sensitivity analysis of time delays is also provided. Whether the communication delays exist or not, the control protocols always guarantee that the output voltage amplitude and frequency of each distributed generator synchronize to the reference values and maintain the optimal active power sharing and the accurate reactive power sharing properties. Moreover, our proposed control protocols are implemented through sparse communication networks and thus meet the plug-and-play feature of the future smart grid. Simulation results are provided to show the effectiveness of the proposed control protocols.
A key issue in the construction of grid-friendly offshore wind farm is how to reasonably achieve the optimal allocation of active power of each unit so as to improve the safety and grid power of the wind farm. This pa...
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A key issue in the construction of grid-friendly offshore wind farm is how to reasonably achieve the optimal allocation of active power of each unit so as to improve the safety and grid power of the wind farm. This paper proposes a novel distributedcontrol strategy for cooperative optimization active power output on the basis of the deficiencies of the traditional distribution strategies. A simple type division algorithm is proposed to solve offshore wind farm dispatch problem. The principle of division is in accordance with the actual conditions and power characteristics of the wind turbine. Secondly, we propose a distributed coordinated control scheme based on ratio consensus algorithm for two types of wind turbines. This algorithm is stem from distributed average consensus for undirected graph. Ratio consensus is guaranteed by updating the auxiliary variables state values with the step size of the distributed consensus algorithm is chosen appropriately. Simulation examples show the effectiveness of these design methods. (C) 2017 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license.
A key issue in the construction of grid-friendly offshore wind farm is how to reasonably achieve the optimal allocation of active power of each unit so as to improve the safety and grid power of the wind farm. This pa...
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A key issue in the construction of grid-friendly offshore wind farm is how to reasonably achieve the optimal allocation of active power of each unit so as to improve the safety and grid power of the wind farm. This paper proposes a novel distributedcontrol strategy for cooperative optimization active power output on the basis of the deficiencies of the traditional distribution strategies. A simple type division algorithm is proposed to solve offshore wind farm dispatch problem. The principle of division is in accordance with the actual conditions and power characteristics of the wind turbine. Secondly, we propose a distributed coordinated control scheme based on ratio consensus algorithm for two types of wind turbines. This algorithm is stem from distributed average consensus for undirected graph. Ratio consensus is guaranteed by updating the auxiliary variables state values with the step size of the distributed consensus algorithm is chosen appropriately. Simulation examples show the effectiveness of these design methods.
This paper proposes a distributed algorithm for coordination of flywheel energy storage matrix system (FESMS) cooperated with wind farm. A simple and distributed ratio consensus algorithm is proposed to solve FESMS di...
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This paper proposes a distributed algorithm for coordination of flywheel energy storage matrix system (FESMS) cooperated with wind farm. A simple and distributed ratio consensus algorithm is proposed to solve FESMS dispatch problem. The algorithm is based on average consensus for both undirected and unbalanced directed graphs. Average consensus is guaranteed in unbalanced digraphs by updating the weight matrix with both its row sums and column sums being 1. Simulation examples illustrate the effectiveness of the proposed control method.
This paper addresses the frequency regulation problem in paralleled inverter-based microgrid. A fully distributed adaptive control scheme is presented without the need for the central computer. With this method the fr...
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ISBN:
(纸本)9781467397148
This paper addresses the frequency regulation problem in paralleled inverter-based microgrid. A fully distributed adaptive control scheme is presented without the need for the central computer. With this method the frequency is regulated to its nominal value, while the power sharing of generators is maintained at the same time. By estimating the parameters on power lines adaptively, the distributed generators do not need prior knowledge of the microgrid system. The adaptive nature of the proposed controller yields a stable performance of the paralleled inverter system. Simulation examples illustrate the effectiveness of the proposed control method.
This paper addresses the frequency regulation problem in paralleled inverter-based microgrid.A fully distributed adaptive control scheme is presented without the need for the central *** this method the frequency is r...
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ISBN:
(纸本)9781467397155
This paper addresses the frequency regulation problem in paralleled inverter-based microgrid.A fully distributed adaptive control scheme is presented without the need for the central *** this method the frequency is regulated to its nominal value,while the power sharing of generators is maintained at the same *** estimating the parameters on power lines adaptively,the distributed generators do not need prior knowledge of the microgrid *** adaptive nature of the proposed controller yields a stable performance of the paralleled inverter *** examples illustrate the effectiveness of the proposed control method.
The paper adopts the method and the strategy of distributed coordinated control, considering the traffic flow of the adjacent intersections and the road status between them generally, make a real time control to the t...
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ISBN:
(纸本)9781424452729
The paper adopts the method and the strategy of distributed coordinated control, considering the traffic flow of the adjacent intersections and the road status between them generally, make a real time control to the traffic signal of each intersection. According to the character of traffic system for urban multi-intersections, this method based on single intersection abandons unified signal cycle in order to improve the traffic capacity and reduce vehicle's delay time. It also adopts fuzzy control assisted with neural network to enhance the system control precision and robustness and has been proved effective by the consequence of the simulation.
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