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9th International Conference on Power and Renewable Energy

作者： Zhang, Haijing Wang, Xin Lu, Yuan Jiang, Yuan Feng, Yankun Guo, Tianan State Grid Shandong Elect Power Supply Co Mkt Serv Ctr Metrol Ctr Jinan Shandong Peoples R China State Grid Zibo Power Supply Co Zibo Shandong Peoples R China Comprehens Energy Technol Co Ltd Hebei Xiongan Xuji Elect Technol Henan Peoples R China

ISBN: (纸本)9798350377477;9798350377460

In recent years, user-side energy storage has developed rapidly and is widely used to save electricity costs for industrial and commercial users. Compared with source-side and grid-side centralised energy storage, user-side energy storage is more decentralised, with smaller single capacity and larger quantity, which is not easy to carry out centralised regulation and control. In contrast, the distributed control method has the characteristics of strong control robustness and stability, which is more suiTABLE as the SOC coordinated control of a large number of distributed energy storage. In this paper, a distributed energy storage SOC coordinated control algorithm based on improved consensus algorithm is designed, which can achieve SOC consensus control of multiple user-side energy storage, and compared with the centralised control scheme, it has the features of small computation amount of the central controller and strong robustness of the controller. Simulation results show that the distributed energy storage SOC coordinated control algorithm based on the improved consensus algorithm designed in this paper can effectively achieve the consistent control of multiple user-side energy storage in the station area.

关键词： User-side energy storage Consensus algorithm SOC coordination SOC estimation distributed control scheme

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Optimal Decision on Current Sharing and Voltage Balancing in DC Microgrids With Feedforward Input

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IEEE TRANSACTIONS ON ENERGY CONVERSION 2021年第3期36卷 2545-2555页

作者： Lu, Zibao Guo, Ge Zhong, Shangpeng Gong, Li Anhui Normal Univ Sch Phys & Elect Informat Wuhu 241000 Peoples R China Northeastern Univ State Key Lab Synthet Automat Proc Ind Shenyang 110819 Peoples R China

This article is concerned with the issue how to achieve proportional current sharing while realizing bus voltage balancing in DC microgrids, or vice versa. In order to address this issue, proportional current sharing is realized first and then the optimal bus voltage is obtained by using the least square method;Second, assuming that the bus voltage balancing is realized, the optimal current sharing is solved by using Lagrange multiplier method. It can be seen that the results of the two cases are identical. Then a global performance index relating to the generation capacities is presented to make an optimal decision on voltage balancing and current sharing. In order to decrease the communication burden, the distributed control schemes are proposed to replace centralized control strategies. It can be proved that the equilibrium points of distributed schemes are completely identical to the optimal solutions without significantly increasing system complexity. Finally, the effectiveness of the proposed distributed schemes is shown via a simulation example.

关键词： Voltage control Microgrids Load modeling Decentralized control Transmission line matrix methods Integrated circuit modeling Integrated circuit interconnections distributed control scheme optimization approach feedforward input current sharing voltage balancing

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distributed Voltage Regulation and Automatic Power Sharing in Multi-Terminal HVDC Grids

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IEEE TRANSACTIONS ON POWER SYSTEMS 2020年第5期35卷 3739-3752页

作者： Zhang, Yuanshi Shotorbani, Amin Mohammadpour Wang, Liwei Li, Wei Univ British Columbia Okanagan Sch Engn Kelowna BC V1V 1V7 Canada OPAL RT Technol Montreal PQ H3K 1G6 Canada

Conventional droop control methods for power-sharing in a multi-terminal high voltage DC (MTDC) grid lead to voltage deviation from the nominal value. Moreover, the power-sharing is inaccurate in the droop-controlled MTDC system. This paper proposes a secondary controller with a distributed architecture to compensate the voltage deviation and to achieve equal power sharing automatically among the converter stations. A distributed observer is used to estimate the average voltage of the converter stations. The proposed distributed controller and observer use local measurements of output powers and voltages, and only communicate with neighboring stations. Therefore, the requirement of the global information in the centralized secondary control schemes is eliminated, which reduces the communication requirement and improves the reliability of the MTDC grid. The case studies illustrate that the proposed distributed controller regulates the stations' average voltage and shares the power mismatch accurately. Impact of the communication time-delays and the control gain on stability of the MTDC grid are also investigated using the Lyapunov-KrasovskiiLMI condition. It is shown that reducing the control gain can stabilize the MTDC grid in the case of large communication time-delays.

关键词： Automatic voltage control Reliability Power system stability Switches Power demand Automatic power sharing average voltage regulation distributed control scheme MMC multi-terminal high-voltage DC system secondary controller

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Stability analysis of islanded DC microgrid for the proposed distributed control strategy with constant power loads

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COMPUTERS & ELECTRICAL ENGINEERING 2018年 70卷 151-162页

作者： Shivam Dahiya, Ratna Natl Inst Technol Kurukshetra Dept Elect Engn Kurukshetra Haryana India

Droop control by means of virtual resistance in control loop is applied for parallel operation of sources in order to minimize circulating currents. The droop control approach is widely used in DC microgrids. The conventional droop control schemes are unable to mitigate trade-off between effective equal load-sharing (in per unit) and bus voltage regulation for unequal cable line parameters. The stability analysis becomes important when constant power loads (CPLs) are applied to DC bus due to the impact of the negative impedance of CPLs. In this paper, the distributed control scheme is proposed with a digital communication link for an averaging current signal to compensate the cable line voltage drop and load sharing error. The proposed control scheme based on the hysteresis current controller is found robust in terms of simplex tuning procedure than conventional cascaded proportional integral controllers. The stability analysis of the DC microgrid is done with the effect of the proposed distributed controller and CPLs. This analysis covers a specific range of droop gain, communication time delay, and CPLs. The performance analysis of the system is done based on three source units and common CPL. (C) 2018 Elsevier Ltd. All rights reserved.

关键词： DC microgrid distributed control scheme Voltage droop control Hysteresis current control Stability analysis CPLs

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Hierarchical control scheme for coordinated reactive power regulation in clustered wind farms

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IET RENEWABLE POWER GENERATION 2018年第10期12卷 1119-1126页

作者： Yuan, Liang Meng, Ke Dong, Zhao Yang Univ New South Wales Sch Elect Engn & Telecommun Sydney NSW Australia

Coordinated reactive power regulation is always a critical issue when it comes to a system with a high penetration level of wind energy. This study provides a distributed control scheme for wind farm reactive power regulation, aiming to coordinate the reactive power reference among wind farm clusters. Within the limited communication among neighbouring clusters, fair reactive power generation sharing is achieved. Moreover, the reactive power capability of the wind turbine (WT) is utilised to cooperate with reactive power compensation devices. The characteristics of the collector system are analysed to improve the voltage profile. Instead of averagely assigning the generation order to each WT, the reference is assigned based on voltage sensitivity. Case studies are carried out to validate the performance of the proposed control scheme.

关键词： reactive power control wind power plants power generation control distributed control wind turbines hierarchical control scheme coordinated reactive power regulation clustered wind farm wind energy distributed control scheme fair reactive power generation sharing wind turbine WT reactive power compensation device collector system

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Automatic restoration system for power distribution networks based on multi-agent systems

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IET GENERATION TRANSMISSION & DISTRIBUTION 2017年第2期11卷 475-484页

作者： Sampaio, Raimundo F. Melo, Lucas Silveira Leao, Ruth P. S. Barroso, Giovanni Cordeiro Bezerra, Jose Roberto Univ Fed Ceara Dept Elect Engn Campus Pici BR-60440554 Fortaleza Ceara Brazil Fed Univ Cear Dept Phys Campus Pici BR-60440554 Fortaleza Ceara Brazil Fed Inst Educ Sci & Technol Ceara BR-60040531 Fortaleza Ceara Brazil

The advance on smart grid calls for the development and application of distributed intelligent control strategies based on open platforms that provides interoperability. The distributed control must be able to ensure reliable and secure operation of the power systems and enhance supply quality to consumers. The development of a multi-agent system for automatic restoration system (MARS) applied to a real power distribution network is presented. The agents of the MARS are embedded in external hardware to the intelligent electronic devices (IEDs) and communicate with each other via standard Foundation for Intelligent Physical Agents open protocols. To evaluate the MARS performance, a computer simulator was developed in Java to represent the distribution system. Experimental tests were performed in laboratory with the simulator integrated to the MARS via TCP/IP. The tests results have shown that the MARS was able to locate and isolate branches under permanent fault condition and restore healthy branches efficiently through a given switching sequence taking into account the system operational constraints. The proposed MARS has proved the effectiveness of distributed control scheme based on multi-agent system that runs independently of the current technologies of the IEDs of control and protection.

关键词： power system restoration MARS Power system management, operation and economics intelligent electronic devices intelligent physical agents open protocols automatic restoration system distributed control scheme Expert systems and other AI software and techniques power distribution networks distribution networks IP Distribution networks Java computer simulator IED power engineering computing multiagent systems multi-agent systems TCP Power engineering computing distribution system

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distributed Simultaneous Coverage and Communication control by Mobile Sensor Networks

Distributed Simultaneous Coverage and Communication Control ...

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IEEE Global Conference on Signal and Information Processing (GlobalSIP)

作者： Kantaros, Yiannis Zavlanos, Michael M. Duke Univ Dept Mech Engn & Mat Sci Durham NC 27708 USA

ISBN: (纸本)9781479970889

The purpose of this paper is to propose a distributed control scheme to maximize area coverage by a mobile robot network while ensuring reliable communication between the members of the team. The information that is generated at the sensors depends on the sensing capabilities of the sensors as well as on the frequency at which events occur in their vicinity, captured by appropriate probability density functions. This information is then routed to a fixed set of access points via a multihop network whose links model the probability that information packets are correctly decoded at their intended destinations. The proposed distributed control scheme simultaneously optimizes coverage and routing of information by decoupling coverage and routing control. Specifically, optimization of the communication variables is performed periodically in the dual domain. Then, between communication rounds, the robots move according to the solution of a distributed sequential concave program that handles efficiently the introduced nonlinearities in the mobility space. Our method is illustrated in computer simulations.

关键词： concave programming decoding distributed control mobile radio mobile robots probability telecommunication control telecommunication network reliability telecommunication network routing wireless sensor networks communication control communication reliability decoupling coverage distributed control scheme distributed sequential concave program distributed simultaneous coverage information routing control mobile robot network mobile sensor network multihop network probability density function Mobile communication Mobile computing Optimization Robot sensing systems Routing Communication and control decentralised control wireless multi-hop networks DECODING Manipulator sensing systems communication reliability telecommunication network reliability Mobile robots Sensor networks telecommunication network routing Mobile radios Network routing Probability density function Mobile Computing mobile communication

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Coordinated primary frequency control among non-synchronous systems connected by a multi-terminal high-voltage direct current grid

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IET GENERATION TRANSMISSION & DISTRIBUTION 2012年第2期6卷 99-108页

作者： Dai, J. Phulpin, Y. Sarlette, A. Ernst, D. SUPELEC Dept Power & Energy Syst F-91192 Gif Sur Yvette France INESC Porto P-4200465 Oporto Portugal Univ Ghent SYSTeMS B-9052 Ghent Belgium Univ Liege Dept Elect Engn & Comp Sci B-4000 Liege Belgium

The authors consider a power system composed of several non-synchronous AC areas connected by a multi-terminal high-voltage direct current (HVDC) grid. In this context, the authors propose a distributed control scheme that modifies the power injections from the different AC areas into the DC grid so as to make the system collectively react to load imbalances. This collective reaction allows each individual AC area to downscale its primary reserves. The scheme is inspired by algorithms for the consensus problem extensively studied by the control theory community. It modifies the power injections based on frequency deviations of the AC areas so as to make them stay close to each other. A stability analysis of the closed-loop system is reported as well as simulation results on a benchmark power system with five AC areas. These results show that with proper tuning, the control scheme makes the frequency deviations converge rapidly to a common value following a load imbalance in an area.

关键词： control of electric power systems high-voltage engineering stability analysis closed-loop system coordinated primary frequency control power injection Power system control distributed control scheme power grids HVDC power transmission control theory community frequency control load regulation load imbalance frequency deviation DC grid Frequency control nonsynchronous AC area d.c. transmission power transmission control multiterminal high voltage direct current grid

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Consensus control for multi-agent systems with double-integrator dynamics and time delays

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IET control THEORY AND APPLICATIONS 2010年第1期4卷 109-118页

作者： Hu, J. Lin, Y. S. Univ Elect Sci & Technol China Sch Automat Engn Chengdu 610054 Peoples R China

In this study, mathematical modelling and analysis for consensus problems will be conducted for a group of autonomous mobile agents with double-integrator dynamics and time-varying interconnection delays. To solve the problems, distributed control scheme for each agent will be proposed first. Then the consensus stability of the multi-agent system is obtained for the problem, where the dynamics of each agent is second-order with time-varying interconnection delays. In the convergence analysis, both fixed and switched interconnection topologies of the considered multi-agent system are investigated. Finally, some numerical examples are presented to validate the consensus algorithms.

关键词： mobile agents multi-agent systems consensus stability autonomous mobile agents double-integrator dynamics consensus control multiagent system distributed control scheme distributed control mathematical modelling delays consensus algorithm time-varying interconnection delays distributed systems software convergence analysis consensus problems time delays Expert systems and other AI software and techniques distributed parameter control systems

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Performance Analysis of Irrigation Channels with distributed control

Performance Analysis of Irrigation Channels with Distributed...

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IEEE International Conference on control Applications Part of 2010 IEEE Multi-Conference on Systems and control

作者： Li, Yuping De Schutter, Bart Delft Univ Technol Delft Ctr Syst & Control NL-2628 CD Delft Netherlands

ISBN: (纸本)9781424453634

For a string of pools with distant-downstream control, the internal time-delay for water transport from upstream to downstream not only limits the local control performance of regulating water-levels at setpoints and rejecting offtake disturbances in each pool, but also impacts the global performance of managing the water-level error propagation and attenuating the amplification of control actions in the upstream direction. A distributed control scheme which inherits the interconnection structure of the plant is studied. It is shown that the decoupling terms in the controller helps to improve global closed-loop performance by decreasing the low-frequency gain of the closed-loop coupling. Moreover, they compensate for the influence of the time-delay by imposing extra phase lead-lag compensation in the mid-frequency range on the closed-loop coupling function.

关键词： closed loop systems closed-loop coupling function closed-loop performance delays distant-downstream control distributed control distributed control scheme extra phase lead-lag compensation internal time-delay irrigation irrigation channels performance analysis water transport water-level error propagation

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