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research on Total electric Field PredictionMethod of Ultra-High Voltage Direct Current Transmission Line Based on Stacking Algorithm

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Computer Systems Science & Engineering 2024年第3期48卷 723-738页

作者： Yinkong Wei Mucong Wu Wei Wei Paulo R.F.Rocha Ziyi Cheng Weifang Yao Key Laboratory of Operation and Control of Terraced Hydropower Plants in Hubei Province Three Gorges UniversityYichang443002China School of electricity and New Energy Three Gorges UniversityYichang443002China Marketing Service Center(Metering Center) State Grid Hubei Electric Power Co.Ltd.Wuhan430072China Centre for Functional Ecology-Science for People&the Planet Associate Laboratory TERRADepartment of Life SciencesUniversity of CoimbraCoimbra3000-456Portugal research institute of electric power Science State Grid Anhui Electric Power Company LimitedHefei230601China

Ultra-high voltage(UHV)transmission lines are an important part of China’s power grid and are often surrounded by a complex electromagnetic *** ground total electric field is considered a main electromagnetic environment indicator of UHV transmission lines and is currently employed for reliable long-term operation of the power ***,the accurate prediction of the ground total electric field remains a technical *** this work,we collected the total electric field data from the Ningdong-Zhejiang±800 kV UHVDC transmission project,as of the Ling Shao line,and perform an outlier analysis of the total electric field *** show that the Local Outlier Factor(LOF)elimination algorithm has a small average difference and overcomes the performance of Density-Based Spatial Clustering of Applications with Noise(DBSCAN)and Isolated Forest elimination ***,the Stacking algorithm has been found to have superior prediction accuracy than a variety of similar prediction algorithms,including the traditional finite *** low prediction error of the Stacking algorithm highlights the superior ability to accurately forecast the ground total electric field of UHVDC transmission lines.

关键词： DC transmission line total electric field effective data multivariable outliers LOF algorithm Stacking algorithm

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Application research of compressed-air energy storage under high proportion of renewable energy

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Clean Energy 2022年第2期6卷 305-312页

作者： Bin Feng Bo Yu state grid ningxia electric power Co.ltd YinchuanNingxiaChina state grid ningxia Economic and Technological research institute YinchuanNingxiaChina

China will strive to achieve a‘dual carbon’target:‘carbon peak’by 2030 and‘carbon-neutral’by *** this context,improving the efficiency of renewable energy and reducing the use of thermal power are important ways to achieve the ***,efficient and large-capacity energy-storage technology is the key to improving the utilization rate of renewable ***,this paper proposes to use compressed-air energy-storage technology instead of the old energy-storage technology to build an economical and environmentally friendly comprehensive energy park capacity optimization configuration ***,this paper uses the newly proposed improved chicken swarm optimization algorithm to solve the model,which is more accurate and ***,this paper analyzes a comprehensive energy park in north-west *** case analysis,it can be seen that the average utilization rate of renewable energy can reach 73.87%through the model proposed in this paper,while the average power-abandonment rate is only 9.32%.

关键词： renewable energy compressed-air energy storage power-abandonment rate chicken swarm optimization

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Distribution Network Equipment Location and Capacity Planning Method Considering Energy Internet Attribute from the Perspective of Life Cycle Cost

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Energy Engineering 2022年第3期119卷 1059-1074页

作者： Qiang Li Lei Xue Xia Lin state grid Shanxi electric power Company Economic and technical research institute TaiyuanChina state grid Shanxi electric power Company TaiyuanChina

For facing the challenges brought by large-scale renewable energy having access to the system and considering the key technologies of energy Internet,it is very necessary to put forward the location method of distribution network equipment and capacity from the perspective of life cycle *** with the traditional energy network,the equipment capacity problem of energy interconnected distribution network which involves in electricity network,thermal energy network and natural gas network is comprehensively considered in this *** this basis,firstly,the operation architecture of energy interconnected distribution network is ***,taking the grid connection location and configuration capacity of key equipment in the system as the control variables and the operation cost of system comprehensive planning in the whole life cycle as the goal,the equipment location and capacity optimization model of energy interconnected distribution network is ***,an IEEE 33 bus energy mutual distribution grid system is taken for example analysis,and the improved chaotic particle swarmoptimization algorithm is used to solve *** simulation results show that the method proposed in this paper is suitable for the equipment location and capacity planning of energy interconnected distribution network,and it can effectively improve the social and economic benefits of system operation.

关键词： Locating and sizing method distribution energy internetwork whole life cycle cost distribution network planning

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research on the risk-evaluation model of power transmission and transformation projects based on multilevel fuzzy-thought weighting for cloud-model improvement

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Clean Energy 2022年第1期6卷 153-164页

作者： Yanli Xiao Ruixin Gou Zheng Wang Ye Wan state grid ningxia electric power Co.Ltd Eco-Tech research institute NingXia Yinchuan750004P.R.China

The risk evaluation of power transmission and transformation projects is a complex and comprehensive evaluation process influenced by many factors and involves many *** order to solve the uncertainty and fuzziness problems in the process of the multilevel fuzzy risk evaluation of power transmission and transformation projects,this paper introduces the cloud theory,which is specialized in the study of uncertainty problems and constructs the multilevel fuzzy comprehensive risk-evaluation model of power transmission and transformation projects based on the improved multilevel fuzzy-thought weighting based on the cloud ***,the risk of the Beijing 220-kV Tangyu power transmission and transformation project is evaluated and the feasibility of the evaluation model is *** results of the evaluation and the evaluation layer cloud model are combined with MATLAB simulation to show that the risk level of the project is between large risk and general risk.

关键词： power transmission and transformation project risk cloud model multilevel fuzzy comprehensive evaluation smart grid

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Optimal Operation of electric Vehicles and Distributed Generation Resources in Smart grid Considering Load Management

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Energy Engineering 2022年第6期119卷 2655-2679页

作者： Zheng Wang Shangke Liu Yanli Xiao Ye Wan Bin Bai state grid ningxia electric power Co. Ltd.Eco-Tech Research InstituteYinchuan750004China

Technology advancement and the global tendency to use renewable energy in distributed generation units in the distribution network have been proposed as sources of energy *** the complexity of their protection,as well as the operation of distributed generation resources in the distribution network,factors such as improving reliability,increasing production capacity of the distribution network,stabilizing the voltage of the distribution network,reducing peak clipping losses,as well as economic and environmental considerations,have expanded the influence of distributed generation(DG)resources in the distribution *** location of DG sources and their capacity are the key factors in the effectiveness of distributed generation in the voltage stability of distribution ***,along with the scattered production sources of electric vehicles with the ability to connect to the network,due to having an energy storage system,they are known as valuable resources that can provide various services to the power *** vehicles can empower the grid or be used as a storage supply source when parked and connected to the *** paper introduces and studies a two-stage planning framework for the concurrent management of many electric vehicles and distributed generation resources with private *** the first stage,the aim is to increase the profit of electric vehicles and distributed generation sources;finally,the purpose is to reduce operating *** proposed scheduling framework is tested on a distribution network connected to bus 5 of the RBTS sample *** distributed generation sources and electric vehicles,we integrate time-consistent load management into the *** to distributed generation sources such as photovoltaic systems and wind turbines and the studied design in the modeling,we use the Taguchi TOAT algorithm to generate and reduce the scenario to ensure the uncertainty in renewable *** software is used t

关键词： electric vehicle distributed generation sources coordinator uncertainty taguchi algorithm harmony search algorithm load management

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Architecture,Key Technologies and Applications of Load Dispatching in China power grid

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Journal of Modern power Systems and Clean Energy 2022年第2期10卷 316-327页

作者： Yu Dong Xin Shan Yaqin Yan Xiwu Leng Yi Wang state grid Corporation of China Beijing 100031China NARI Group Corporation(state grid electric power research institute) Nanjing 211000China

With the development of renewable energy and the changes in the characteristics of power grid,it is becoming increasingly difficult to balance power supply and demand in space and *** addition,the requirement for improved dispatching capability of power grid is ***,the potential of flexible load dispatching should be realized,which can promote the large-scale consumption of renewable energy and the construction of new power *** on the analysis of existing load dispatching studies and the differences in the characteristics of domestic and foreign load dispatchings,a technical architecture and several key technologies are proposed for load resources to participate in power grid dispatching under the new situation,i.e.,the autonomous collaborative control system of load *** system implements the multi-layer coordinated control of main,distribution and micro grids(load aggregators).Adjustable load resources are aggregated through an aggregator operation platform and connected with a dispatcher load regulator platform to realize real-time data interaction with dispatching agencies as well as the monitoring,con-trol,and marketing of *** supports the load resources to participate in network-wide dispatching optimization via continuous power *** key technologies such as the control mode,load modeling,dispatching strategy,and safety protection are also *** the closed-loop control of orderly charging piles and energy storage clusters in the North China power grid,the feasibility of the proposed architecture and key technologies is *** route has successively supported multiple adjustable load aggregators to partici-pate in the ancillary services market of North China power grid for ***,the technical challenges of load resources participating in power grid dispatching under the dual carbon goals are discussed and prospected.

关键词： Automatic power control(APC) load modeling load dispatching renewable energy accommodation situation awareness.

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Two-Stage Low-Carbon Economic Dispatch of Integrated Demand Response-Enabled Integrated Energy System with Ladder-Type Carbon Trading

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Energy Engineering 2023年第1期120卷 181-199页

作者： Song Zhang Wensheng Li Zhao Li Xiaolei Zhang Zhipeng Lu Xiaoning Ge state grid Shandong electric power Company Jinan250000China state grid Shandong electric power Company Economic and technical research institute Jinan250000China state Nuclear electric power Planning Design&research institute Co. Ltd.Beijing100095China

Driven by the goal of“carbon neutrality”and“emission peak”,effectively controlling system carbon emissions has become significantly important to governments around the *** this end,a novel two-stage low-carbon economic scheduling framework that considers the coordinated optimization of ladder-type carbon trading and integrated demand response(IDR)is proposed in this paper for the integrated energy system(IES),where the first stage determines the energy consumption plan of users by leveraging the price-based electrical-heat *** contrast,the second stage minimizes the system total cost to optimize the outputs of generations with consideration of the uncertainty of *** addition,to fully exploit the system’s emission reduction potential,a carbon trading cost model with segmented CO_(2) emission intervals is built by introducing a reward-penalty ladder-type carbon trading mechanism,and the flexible thermal comfort elasticity of customers is taken into account by putting forward a predicted mean vote index on the load *** CPLEX optimizer resolves the two-stage model,and the study results on a modified IES situated in North China show the proposed model can effectively reduce carbon emissions and guarantee economical efficiency operation of the system.

关键词： Integrated energy system low-carbon economic dispatch integrated demand response ladder-type carbon trading thermal comfort elasticity

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Intelligent Breakage Assessment of Composite Insulators on Overhead Transmission Lines by Ellipse Detection Based on IRHT

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CSEE Journal of power and Energy Systems 2023年第5期9卷 1942-1949页

作者： Zhikang Yuan Linxuan He Shaohe Wang Youping Tu Zhaojing Li Cong Wang Fan Li College of Electronic and Information Engineering Tongji UniversityShanghai 201804China the state Key Laboratory of Alternate electrical power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China state grid Zhejiang electric power research institute Hangzhou 310014China state grid Jiangxi electric power research institute Nanchang 330000China

With the development of unmanned aerial vehicle(UAV)technology,visible images are playing an important role in the maintenance of power *** achieve the shed breakage evaluation of composite insulators by UAV visible images,an intelligent fault assessment method is ***,the composite insulators in visible light images are identified by *** image preprocessing,the image is enhanced and the noise is ***,a canny operator is used to extract the edge of the *** Improved Randomized Hough Transform(IRHT)is used to detect the ellipses in the edge *** parameters of the detected ellipse,length of major axes and minor axes,center coordinates and deflection angle of major axes,are used to realize the segmentation of the composite ***,the number of pixel points in the ellipse and the distance between the points and the ellipse boundary are used to judge whether there are breakage or cracks on the *** area ratio of the breakage to the whole shed is calculated based on the number of pixel points inside the broken *** method can be realized without a large amount of training dataset of the specific fault type and provides a technical basis for the online fault assessment of a composite insulator on overhead transmission lines.

关键词： Breakage assessment composite insulator ellipse detection Improved Randomized Hough Transform(IRHT)

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DC Current Order Optimization Based Strategy for Recovery Performance Improvement of LCC-HVDC Transmission Systems

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Journal of Modern power Systems and Clean Energy 2023年第3期11卷 1020-1026页

作者： Renlong Zhu Xiaoping Zhou Shuchen Luo Lerong Hong Hanhang Yin Yifeng Liu College of electrical and Information Engineering Hunan UniversityChangsha 410082China state grid Hunan electric power Company Limited Economical and technical research institute Changsha 410011China

For the safe and fast recovery of line commutated converter based high-voltage direct current(LCC-HVDC)transmission systems after faults,a DC current order optimization based strategy is *** the constraint of electric and control quantities,the DC current order with the maximum active power transfer is calculated by Thevenin equivalent parameters(TEPs)and quasi-state equations of LCC-HVDC transmission ***,to mitigate the subsequent commutation failures(SCFs)that may come with the fault recovery process,the maximum DC current order that avoids SCFs is calculated through imaginary commutation ***,the minimum value of the two DC current orders is sent to the control *** results based on PSCAD/EMTDC show that the proposed strategy mitigates SCFs effectively and exhibits good performance in recovery.

关键词： Line commutated converter(LCC) high-voltage direct current(HVDC) DC current order calculation subsequent commutation failure(SCF) recovery

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Stability Analysis and Control of DC Distribution System with electric Vehicles

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Energy Engineering 2023年第3期120卷 633-647页

作者： Zhijie Zheng Song Zhang Xiaolei Zhang Bo Yang Fang Yan Xiaoning Ge state grid Shandong electric power Company Economic and Technological research institute JinanChina state grid Shandong electric power Company Limited JinanChina state Nuclear electric power Planning Design&research institute Company Limited BeijingChina

The DC distribution network system equipped with a large number of power electronic equipment exhibits weak damping characteristics and is prone to low-frequency and high-frequency unstable *** current interpretation of the oscillation mechanism has not been ***,this paper established the complete statespace model of the distribution system consisting of a large number of electric vehicles,characteristic equation of the distribution network system is derived by establishing a state-space model,and simplified reduced-order equations describing the low-frequency oscillation and the high-frequency oscillation are ***,based on eigenvalue analysis,the oscillation modes and the influence of the key system parameters on the oscillation mode are ***,impacts of key factors,such as distribution network connection topology and number of dynamic loads,have been discussed to suppress oscillatory instability caused by inappropriate design or dynamic ***,using the DC distribution example system,through model calculation and time-domain simulation analysis,the correctness of the aforementioned analysis is verified.

关键词： DC distribution network system oscillation instability reduced-order equivalent model damping control sensitivity analysis

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