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Design and Implementation of an OPC UA-based Cloud System for the Management of Distributed Microgrid Networks |
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Changdae Lee, Junghwan Im, Hyukyoon Kwon, Young Il Lee(SeoulTech, Korea) |
| This paper introduces a cloud system based on Open Platform Communications Unified Architecture (OPC UA) for managing distributed microgrid networks. It proposes a three-layer model optimized for cloud-based microgrid management and specifies the information model for each layer. The paper emphasizes the use of JSON format for data transmission within the cloud. A detailed diagram, designed for a testbed at SeoulTech University, demonstrates the system's applicability in managing distributed microgrids. The paper also discusses the necessary communication protocols for each layer, providing a complete overview of the system's operational requirements. |
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Improved Rotor Speed Strategy of a DFIG for Suppressing Second Frequency Drop |
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Gangui Yan(Northeast Electric Power University, China), Yanfeng Ge(State Grid Liaoning Electric Power, China), Yang De Jian(Northeast Electric Power University, China), Mingyi Sun(State Grid Liaoning Electric Power, China), Xinwei Li(Electric Power Research Institute of State Grid Liaoning Electric Power , China), Xin Wang(Northeast Electric Power University, China) |
| After supporting system frequency, when regaining the rotor speed, the existing recovery researches are unable to achieve the counterbalance between the depth double frequency drop (DFD) and rotor speed recovery performance. To overcome this issue, firstly, the influence of the amount of the power reduction on the DFD and the speed recovery performance is quantified in this paper; secondly, a recovery strategy of DFIG based on PI controller is proposed, in which the active power reduction with output characteristics of “rising after restraining” is preliminary constructed. Then, in order to compensate the shortcomings of the fixed-PI-coefficient based speed recovery strategy; the dynamic-PI- |
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Adaptive Frequency-Regualtion Strategy of a DFIG for Enhancing Frequency Support Capability |
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Mingyi Sun(State Grid Liaoning Electric Power , China), Xinwei Li(Electric Power Research Institute of State Grid Liaoning Electric Power, China), Dejian Yang(Northeast Electric Power University, China), Lin Yue(Northease Electric Power University, China), Xin Wang(Northeast Electric Power University, China) |
| Short-term frequency support (STFS) strategy with droop control of variable-speed wind turbine generators could provide fast frequency response to improve the maximum rate of change of frequency (MROCOF) and maximum frequency deviation (MFD); however, the improvement capability of MFD is weakened because of the dynamics of the maximum power point tracking operation control loop. To address the dynamics, an improved STFR strategy based on power tracking operation is suggested. To address the difficulties for assigning the control coefficients of power tracking operation mode suitable for various conditions, the adaptive control coefficients of power tracking operation mode are determined base |
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Constrained Variational Policy Optimization for Emergency Load Shedding of Power Systems |
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Zhang Haotian, Sun Xinfeng, Moon Jun, Lee Myoung Hoon(Hanyang University, Korea) |
| Power system emergency control with safety has been considered to be an essential issue as it is regarded as the last safety guarantee for power system grids. Nowadays, it is difficult to meet the requirements of stability and adaptiveness using traditional emergency control methods. In this paper, we approach the Constrained Variational Policy Optimization (CVPO) algorithm to load shedding tasks, it can achieve good training performance and efficiency. |
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Voltage and Frequency Control in a Multi-Area Power System with Integrated PV and BESS using Tie-Line Synchronization |
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Pornnapat Amornsrivarakul, Norranat Songsriboonsit, Itthisek Nilkhamhang(Sirindhorn International Institute of Technology, Thammasat University, Thailand) |
| This paper utilizes particle swarm optimization and a prediction model based on load profiles to mitigate voltage and frequency deviations in a multi-area power system. Verification is conducted using data obtained from a university campus in Thailand, including power generation from PV cells and daily power consumption. Other prerequisite assumptions include the installation of battery energy storage systems and flexible AC transmission system devices that enable power-sharing between interconnected feeders. By adjusting the tie-line synchronizing coefficients between areas, the result demonstrates that the proposed strategy effectively improves the power quality in the multi-area system. |
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Real-time Reconfiguration of Networked Microgrids for Frequency Regulation using Optimal Switching Control |
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Donghyun Lee, Jaepil Ban(Kumoh National Institute of Technology, Korea) |
| Frequency regulation is crucial for balancing supply and demand by controlling frequency deviations. This study introduces a real-time method for optimal frequency regulation in networked microgrids, using network reconfiguration and secondary frequency control. The method employs switched system frameworks, where different modes represent microgrid dynamics based on switch statuses. By using optimal switching control theory, it simultaneously determines the best network configuration and secondary control inputs for effective frequency regulation. Simulation shows this method surpasses conventional approaches in minimizing frequency deviations. |
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