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Renewable Microgrid protection strategy Coordinating with Current-based Fault Control

Journal of Modern Power Systems and Clean Energy 2022年第6期10卷 1679-1689页

作者： Zihao Wang Longhua Mu Chongkai Fang College of Electronics and Information Engineering Tongji UniversityShanghai 201804China

The renewable microgrid(RMG)is a critical way to organize and utilize new energy.Its control and protection strategies during the fault are the core technologies to ensure the safe operation and stability of the system.The traditional protection principles are unsuitable for RMGs due to the flexibility of RMG operation,the complexity of RMG topology,and the variety of fault control strategies of inverter-interfaced distributed generators(IIDGs).The traditional fault component protection principle is affected by the low voltage ride-through(LVRT)control strategy and will fail in some scenarios.In order to make the fault component protection principle available in every scenario,a current-based fault control strategy is proposed.Specific fault characteristics are generated by the grid-feeding IIDGs during the fault so they can be equivalent to the open circuits,and the fault models in additional network can be simplified.By analyzing the fault characteristics,an RMG protection strategy based on the current-based fault control of IIDGs is presented.The fault directions of feeders can be distinguished and the fault feeder can be located accurately in both grid-connected and islanded RMGs.Then,the grid-feeding IIDGs can transit to LVRT mode smoothly.Thus,IIDGs are considered comprehensively in terms of coordinating with fault control and fault characteristic generation.Finally,the experimental results of the hardware platform prove the effectiveness of the proposed current-based fault control strategy,and the simulation results based on PSCAD/EMTDC verify the correctness of the protection strategy.

关键词： Renewable microgrid protection strategy fault characteristic control strategy fault component

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Research on the historical and cultural value of and protection strategy for rammed earth watchtower houses in Chongqing,China

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Built Heritage 2021年第3期5卷 143-158页

作者： Ying Shu Ying He Public Art College Sichuan Fine Arts Institute3-9-3Mingliugongguan MansionZhongshan 4th RoadYuzhong DistrictChongqing 400015China USA Corporation CarsonUSA

Chinese watchtower houses are part of the unique human cultural heritage of the world’s vernacular architectures.Many earthen manor watchtower houses in Chongqing,China,have absorbed the characteristics of other tower houses across the country and have brought together various types of watchtower construction techniques.They are important connection points for the integrity of the Chinese watchtower house as a comprehensive architectural cultural heritage system.They can be a typical sample of Chinese Han classical towers.These buildings are indispensable parts of the Chinese residential watchtower system and have important cultural protection value.However,due to the general lack of excavation and attention to their historical and cultural value,these buildings are on the verge of disappearing.Although they have lost their original architectural functions,they have important value in terms of their building materials,technical composition and artistic modelling.They can stimulate special emotional resonance and become an important bridge that maintains the cultural connection between ancient and modern humans.Therefore,discussing the historical and cultural value of Chongqing rammed earth watchtower houses,the strategy for heritage protection and utilisation is of far-reaching signifcance for Chinese watchtower dwellings.

关键词： Chongqing Historical culture Rammed earth watchtower house protection strategy

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Multi-performance Optimization of Cement Blending Process

Multi-performance Optimization of Cement Blending Process

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第三十届中国控制会议

作者： LI Junli,MAO Jianlin,ZHANG Guanghui College of Information Engineering and Automation,Kunming University of Science and Technology,Kunming 650051,P.R.China

＜正＞In order to effectively solve the blending optimization problem in cement production process,an optimization model integrating production indices,the cost and its solution method are provided.Firstly,the cost and the rate values of raw materials are incorporated into the optimization model respectively as the objective function.Penalty function is used to transform optimization problem with constraints into an unconstrained problem.And then particle swarm optimization algorithm（PSO） is applied to search the optimum ratios.When the optimization information of swarm becomes stagnant,the "inertia weight" operator,cross and mutation operations based on protection strategy are introduced in the optimization process that make the algorithm to maintain diversity and better convergence rates.The calculation result shows that the presented method can effectively improve the global search ability and convergence speed.The optimization result can improve the passing rate of indicators by reducing production cost and the harmful ingredient of the mixed material.

关键词： Blending optimization Penalty function Particle swarm optimization algorithm Inertia weight protection strategy

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