检索结果-南通市图书馆

Coordination of PSS and FACTS Damping Controllers to Improve Small Signal Stability of Large-scale power Systems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CSEE Journal of power and Energy Systems 2019年第4期5卷 507-514页

作者： Guangzheng Yu Tao Lin Jiannan Zhang Ye Tian Xiu Yang Shanghai University of Electric power ShanghaiChina Electrical Engineering School Wuhan UniversityWuhanChina Zhumadian power supply company of Henan Electric power company ZhumadianChina Central China Electric power Dispatching and Commu-nication Center WuhanChina

This paper presents an approach for designing parameters of power system stabilizer(PSS)and FACTS damping controllers in a large scale practical power *** objective is maximizing damping ratio of the target mode,and tracking technology(MTT)is used to avoid frequent alternations of target mode in optimization *** improved planted growth simulation algorithm(IPGSA),which has high search efficiency and quick convergence speed,is proposed to optimize controller parameters *** on case study of a large-scale power grid,and by using local and interregional low-frequency oscillation modes as target modes,simulation results verify proposed method in this ***,coordination optimization strategy adapted to multi-operating conditions demonstrates that the proposed approach is robust.

关键词： Coordinating optimization large-scale power grid mode tracking technology PSS and FACTS damping controllers small signal stability

RankXGB-Based Enterprise Credit Scoring by Electricity Consumption in Edge Computing Environment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2023年第4期75卷 197-217页

作者： Qiuying Shen Wentao Zhang Mofei Song State Grid Suzhou power supply company Suzhou215004China School of Computer Science and Engineering Southeast UniversityNanjing210000China

With the rapid development of the internet of things(IoT),electricity consumption data can be captured and recorded in the IoT cloud *** provides a credible data source for enterprise credit scoring,which is one of the most vital elements during the financial decision-making ***,this paper proposes to use deep learning to train an enterprise credit scoring model by inputting the electricity consumption *** of predicting the credit rating,our method can generate an absolute credit score by a novel deep ranking model–ranking extreme gradient boosting net(rankXGB).To boost the performance,the rankXGB model combines several weak ranking models into a strong *** to the high computational cost and the vast amounts of data,we design an edge computing framework to reduce the latency of enterprise credit ***,we design a two-stage deep learning task architecture,including a cloud-based weak credit ranking and an edge-based credit score *** the first stage,we send the electricity consumption data of the evaluated enterprise to the computing cloud server,where multiple weak-ranking networks are executed in parallel to produce multiple weak-ranking *** the second stage,the edge device fuses multiple ranking results generated in the cloud server to produce a more reliable ranking result,which is used to calculate an absolute credit score by score *** experiments demonstrate that our method can achieve accurate enterprise credit evaluation quickly.

关键词： Electricity consumption enterprise credit scoring edge computing deep learning

Optimal Decomposition of Stochastic Dispatch Schedule for Renewable Energy Cluster

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Modern power Systems and Clean Energy 2021年第4期9卷 711-719页

作者： Yue Yang Wenchuan Wu Bin Wang Mingjie Li Tao Zhu State Key Laboratory of power Systems Department of Electrical EngineeringTsinghua UniversityBeijing 100084China National Electric power Control Center of State Grid Corporation of China BeijingChina Kunming Electric power supply company of Yunnan power Grid Corporation KunmingChina

The correlated renewable energy farms are usually aggregated as a cluster in economic dispatch to relieve computational *** strategy can also achieve better performance since the precision of predicting the power generation of a cluster can be higher than those of individual *** paper proposes an optimal decomposition method to allocate dispatch schedules among renewable energy farms(REFs)in the cluster under existing stochastic optimization *** proposed model takes advantage of probabilistic characteristics of renewable generation to minimize the curtailment and ensure the feasibility of dispatch schedule of the *** tractable formulation and efficient solution method are the proposed to solve the proposed *** tests show that the proposed method achieves the optimal decomposition of dispatch schedule among REFs and facilitates the utilization of renewable generation.

关键词： Renewable energy stochastic optimization economic dispatch decomposition of dispatch schedule

维普期刊数据库

Hierarchically Correlated Equilibrium Q-learning for Multi-area Decentralized Collaborative Reactive power Optimization

在线全文

学校读者我要写书评

暂无评论

CSEE Journal of power and Energy Systems 2016年第3期2卷 65-72页

作者： Min Tan Chuanjia Han Xiaoshun Zhang Lexin Guo Tao Yu Yangjiang power supply Bureau China Southern Power Grid CompanyYangjiang 529500China College of Electric power South China University of TechnologyGuangzhou 510640China Shenzhen power supply Co. LtdShenzhen 518000China

A hierarchically correlated equilibrium Q-learning(HCEQ)algorithm for reactive power optimization that considers carbon emission on the grid-side as an optimization objective,is proposed *** on the multi-area decentralized collaborative framework,the controllable variables in each region are divided into several optimization layers,which is an effective method for solving the limitations posed by *** HCEQ provides constant information on the interaction between the state-action value function matrices,as well as on the cooperative game equilibrium among agents in each *** acquiring the optimal value function matrix in the pre-learning process,HCEQ is able to quickly achieve an optimal solution *** of the IEEE 57-bus system is performed,which demonstrates that the proposed algorithm can effectively solve multi-area decentralized collaborative reactive power optimization,with the desired global search capabilities and convergence speed.

关键词： Hierarchically correlated equilibrium multiarea decentralized collaborative reactive power optimization reinforcement learning

Research progress on electrolyte key salts for sodium-ion batteries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2024年第02期34卷 263-273页

作者： weimin Zhao Miao Wang Haichen Lin Kangwoon Kim Rongkai He Shijie Feng Haodong Liu College of Chemical Engineering and Safety Binzhou University Center for Memory and Recording Research Building University of California San Diego STATE GRID Liaocheng power supply company

Sodium-ion batteries(SIBs) are considered potential successors to lithium-ion batteries in the fields of energy storage and low-speed vehicles, thanks to their advantages such as abundant raw material sources, high energy density, and a wide operational temperature range. However, several scientific and engineering challenges still require attention in the development of sodium-ion batteries. Electrolyte salts, as a key component of sodium-ion battery electrolytes, play a critical role in battery performance. This paper provides a brief overview of the research progress on different electrolyte salt systems in sodium-ion batteries. It discusses characteristics such as ionic conductivity, electrochemical windows, electrochemical performance, and thermal safety in various solvent systems. Furthermore, the paper summarizes a series of strategies for controlling electrolyte and electrode interfaces, offering references for addressing the challenges in the mass production and application of sodium-ion batteries.

关键词： Sodium ion batteries Electrolyte Electrolyte salts Electrochemical performance

Global synchronous discontinuous pulse width modulation method with fast calculation capability for distributed three-phase inverters

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Modern power Systems and Clean Energy 2016年第1期4卷 103-112页

作者： Tao XU Ran WEI Ke ZHOU Feng GAO Key Laboratory of power System Intelligent Dispatch and Control(Shandong University) Ministry of EducationJinan 250061China State Grid Jining Electric power supply company Jining 272000China

When multiple distributed converters are integrated, the high frequency harmonics will randomly accumulate at the point of common coupling(PCC). This paper proposes a new fast global synchronous discontinuous pulse width modulation(GSDPWM) method of threephase inverters to effectively attenuate the high frequency current harmonics at PCC. Firstly, the basic principle and the realization method of GSDPWM for three-phase inverters are explained, which can be employed for different modulation types. Then a fast calculation method,which can equally derive the minimized total harmonic distortion(THD) of total current, is proposed to release the calculation burden. Finally, MATLAB simulations and experimental results are presented to verify the performance of GSDPWM.

关键词： Global synchronous pulse width modulation Three-phase inverters High frequency harmonics Discontinuous pulse width modulation

维普期刊数据库

Chaos Existence in Surface Discharge of Tracking Test

在线全文

学校读者我要写书评

暂无评论

Transactions of Tianjin University 2009年第3期15卷 168-172页

作者：杜伯学董典帅郑晓磊 School of Electrical Engineering and Automation Tianjin University State Grid Jiangsu Wuxi power supply company Henan Electric power Survey and Design Institute

Tracking tests for different polymer materials were carried out to investigate the chaotic behavior of surface discharge. The discharge sequences measured during the discharge process were analyzed for finding the evidence of chaos existence. Four kinds of nonlinear analysis methods were adopted： estimating the largest Lyapunov exponent, calculating the fractal dimension with increasing the embedding dimension, drawing the recurrence plots, and plotting the Poincare maps. It is found that the largest Lyapunov exponent of the discharge is positive, and the plot of fractal dimension, as a function of embedding dimension, will saturate at a value. The recur- rence plots show the chaotic frame-work patterns, and the Poincar6 maps also have the chaotic characteristics. The results indicate that the chaotic behavior does exist in the discharge currents of the tracking test.

关键词： chaos Lyapunov exponent fractal dimension recurrence plot Poincare map tracking

维普期刊数据库

Newly designed identifying method for ice thickness on highvoltage transmission lines via machine vision

在线全文

学校读者我要写书评

暂无评论

High Voltage 2021年第5期6卷 904-922页

作者： Bingjun Weng Wei Gao Weicou Zheng Gengjie Yang College of Electrical Engineering and Automation Fuzhou UniversityFuzhouFujianChina Ningde power supply company of State Grid Fujian Electric power Co. LtdNingdeFujianChina

The icing of transmission lines will bring considerable challenges to the safe operation of the power ***,a novel method combines machine vision and machine learning algorithms for identifying the ice thickness on high‐voltage transmission line(HVTL)as proposed ***,noise and background interference in the image are filtered,and the grey image is used as ***,the algorithms of improved Canny edge detection,Hough transform,improved K‐means clustering,and least‐squares fitting are adopted in turn to locate the edges of ***,according to the distance mapping model based on monocular vision,the ice thickness of the conductor is determined by calculating the width difference before and after *** experimental results show that the proposed method can accurately locate the edge of the conductor in both field and experimental ***,it can ensure ideal effects under different illumination and hardly not be affected by distortion in both horizontal and vertical ***,the distance mapping model can map the pixel distance to the actual distance with high precision,no matter whether the background is simple or complex,and the calculated ice thickness has only a small deviation compared to the actual *** addition,the proposed method shows high reliability and effectiveness when various interference such as different backgrounds,uneven icing,height difference changes,conductor movement,contrast changes,and conductor sag occur.

关键词： method image illumination

Storage and parallel topology processing of the power network based on Neo4j 36

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Storage and parallel topology processing of the power networ...