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more..Optimization Dispatch Strategy for Multi-park Integrated Energy System Based on Spatiotemporal Correlation Pricing Mechanism
CHEN Jie;ZHOU Zilong;ZHANG Qiaolong;NIU Zhewen;XIE Liwei;Taiyuan University of Technology;Changsha University of Science and Technology;To address the mismatch between supply and demand across parks caused by the spatiotemporal differences in energy sources and loads within the multi-park integrated energy system(MPIES),a two-stage optimization dispatch strategy for MPIES is proposed based on a spatiotemporal correlation pricing mechanism.Firstly,a spatiotemporal correlated pricing mechanism,led by the upper-level energy service operator(ESO),is proposed based on time-of-use energy prices and cross-regional transmission costs.This mechanism dynamically characterizes the linkage between electricity and gas prices,as well as the cross-park regulation capabilities of energy storage devices,to guide the MPIES in achieving optimal energy allocation across time and space. Secondly,a bi-level scheduling model based on leader-follower game equilibrium is constructed between the ESO and MPIES. The first stage focuses on maximizing the ESO's profit through upper-level scheduling among the ESO,power grid,and gas network,while the second stage minimizes the MPIES's operational costs through lower-level scheduling between the ESO and MPIES. Finally,a distributed equilibrium collaborative optimization algorithm,which combines the distributed iterative alternating direction method of multipliers(DI-ADMM)and the gradient projection method,is proposed to solve the bi-level scheduling model.Case studies demonstrate that this strategy effectively coordinates multi-energy complementarity in the MPIES,enhances economic benefits,and significantly reduces carbon emissions,holding important practical significance for advancing dual carbon goals.
Accurate Current Measurement Method for Overhead Lines Based on Multi-source MEMS Sensors
ZHOU Zhanfan;YAN Yu;HE Zeyu;BI Lanxi;YU Kun;With the evolution of smart grids towards high-proportion renewable energy integration,wide-frequency-band current accurate detection in overhead transmission lines has become a critical technological requirement for situational awareness in new power systems.Aiming at the technical bottleneck of traditional electromagnetic current transformers being limited by the frequency response characteristics of iron core materials,which makes it difficult to achieve accurate transformation of high-frequency currents at the kHz level,this study focuses on the accuracy improvement of non-contact measurement methods. Although existing current sensors based on the tunneling magnetoresistance(TMR) effect exhibit advantages in wideband measurement,their decoupling calculations for three-phase current detection in overhead lines are significantly affected by spatial displacement disturbances caused by overhead line galloping.A multi-physical quantity fusion measurement method is proposed to address these challenges. First,a TMR current sensor array is employed to perform decoupled measurements of three-phase current in overhead lines under ideal static conditions,followed by an analysis of measurement errors induced by conductor displacement.Subsequently,an improved three-phase current measurement method for overhead lines using micro electro mechanical systems(MEMS)acceleration sensors is proposed.By fusing TMR current sensors with MEMS acceleration sensors,this approach simultaneously measures three-phase current while utilizing MEMS acceleration sensors to monitor real-time conductor motion postures and synchronously correcting the three-phase current decoupling equations,ultimately achieving precise three-phase current measurement of overhead lines in complex environments.
Optimization of Distribution Network Fault Repair and Restoration Coordination Under Dynamic Improvement of Power Supply Capacity
CHEN Bingbing;LIU Jiateng;WU Haotian;LIANG Rui;WANG Haiwei;State Grid Naijing Power Supply Company;In order to solve the fault recovery of distribution networks after accidents under extreme disasters,a coordinated optimization method of fault repair and restoration of distribution networks under dynamic restoration of power supply capacity is proposed,which quickly restores the power supply capacity through reconfiguration and repair of distribution networks under extreme disasters. First,the coupled planning model of distribution network fault restoration considering islanding,reconfiguration,and repair is created by comprehensively considering important load restoration,network loss,and the number of switch actions,and the layers interact with each other and dynamically optimized to ensure that the distribution network is reliably and quickly restored to normal.Then,the models and algorithms of each layer are introduced respectively,and the dynamic islanding strategy is adopted to realize faster and better restoration of power supply capacity during distribution network fault repair using the improved whale optimization algorithm(WOA) and dynamic recovery strategy. Finally,the effectiveness of the proposed strategy is verified by arithmetic simulation.
Delay-dependent Robust H_∞ Control for LFC in Advanced Power Systems
FAN Chunling;LIAN Honghai;LIU Yongzhi;JIA Rui;LI Zhiyang;A novel delay-dependent robust control H_∞design method is proposed for load frequency control(LFC)in power systems,aimed at enhancing system robustness and improving tolerance to network-induced delays.Firstly,a PI-type LFC control strategy is employed to establish an LFC model for multi-area power systems that incorporates renewable energy integration while considering time delays. Secondly,using an augmented Lyapunov-Krasovskii(L-K) functional and free matrix inequality estimation techniques,we formulate delay-dependent robust H_∞ stability and stabilization conditions for power system LFC.Finally,the effectiveness and superiority of the proposed method are verified through case studies of onearea and three-area LFC systems with renewable energy integration.
Overview of Application of Machine Learning in Wind Power Forecasting
LI Te;HUANG Ziying;Wind power generation has intermittent,random,and uncertain characteristics. Accurate wind power prediction methods are crucial for ensuring the stable operation of the power grid and promoting the consumption of new energy. A machine learning based wind power prediction model can establish a nonlinear and complex mapping between input features and predicted power values through feature mining and complex correlations of a large amount of data. Firstly,the overall framework of wind power prediction based on machine learning is given,and then summarizes five prediction models including deep learning prediction model,ensemble learning prediction model,small sample prediction model,online learning prediction model,and physical data joint prediction model. Targeted research suggestions are proposed,and the five wind power prediction models are compared and analyzed.Finally,the application of large model technology in wind power prediction is briefly analyzed,and the wind power prediction models based on machine learning small and large models are compared.
Research Status Review of Robots Applied in Substations for Equipment Inspection
Yang Xudong;Huang Yuzhu;Li Jigang;Li Li;Li Beidou;Inner Mongolia Power(Group)Co.,LTD Baotou Power Supply Bureau;Shandong Luneng Intelligence Technology Co.,LTD;T he substation inspection robot is an intelligent robot with infrared and visible camera to inspect and analyze the condition of the equipment instead of people.There are many countries have been study on the robotics technology,including Japan,China,Canada and Brazil.We introduce the technology research status and the generalization of the robot applied in the substation.
[Downloads: 4,366 ] [Citations: 290 ] [Reads: 71 ] HTML PDF Cite this article
Research on Fuzzy PID Control Method Combined Fuzzy Theory and Conventional PID Control
Fuzzy control and PID control are often used in industrial control area.However,a single fuzzy control or PID control can not satisfy the need of the rising complexity and precision of control systems.This paper deeply analyzed the advantages and the disadvantages of fuzzy control and PID control,and proposed a new fuzzy PID control combined fuzzy control and PID control.The simulation results show that the proposed method can effectively reduce the overshoot of the control system,accelerate the response speed,and shorten the adjustment time,thus,the method can enhance the dynamic performance of the control systems.
[Downloads: 3,883 ] [Citations: 168 ] [Reads: 89 ] HTML PDF Cite this article
Applying Unmanned Autonomous Helicopter to Transmission Line Inspection
With the rapid extention of the electric distribution network,the workload of the inspection of transmission lines increases dramatically.Unmanned helicopters,a kind of unmanned aerial vehicle(UAV),can be applied to transmission line inspection to improve the efficiency This paper introduces and discusses the some techniques of applying an unmanned helicopter to transmission line inspection.The main inspection tools are visible light camera and infeared camera.The inspection targets include tansmission lines,jumper conductor,isulator,damper,clamper,tower,hardware fittings,etc.The aim of inspection is to find any device damages,hardware fitting missing and thermal defects.This paper also introduces the unmanned helicopter and the carried inspection system and perspect the further applications of unmanned helicopters in power industry.
[Downloads: 1,310 ] [Citations: 162 ] [Reads: 94 ] HTML PDF Cite this article
Study on Performance and Application of Lithium Iron Phosphat Battery
Zhang Song,Ding Guangqian,Hu Tiejun,et alThe lithium iron phosphate(LiFePO4) battery has advantages of high voltage,energy density,long service life,safety performance,low self-discharge rate and no memory effect.This paper introduced the structure of LiFePO4 battery,the principle of charging and discharging.It introduced the structure of LiFePO4 battery energy storage system and discussed the principle of energy conversion system.It also studied the applications of LiFePO4 battery which is widely used in stable supply of renewable energy such as wind power,solar power,peak load shifting,electric vehicles,distributed power and uninterruptible power supply.
[Downloads: 3,788 ] [Citations: 92 ] [Reads: 72 ] HTML PDF Cite this article
Study on Power Quality and its Measurement
The basic situation of power quality is briefly reviewed.The necessity to detect and measure the power quality is discussed.The detecting items and basic hardware requirements are listed.Some feasible detecting methods are presented.
Review of Load Flow Calculation Methods in Power Systems
The load flow calculation is one of the most commonly used tools in power system engineering. This paper presents a summary of the load flow calculation. At first, a brief review of the development of load flow calculation is given; and secondly, a variety of algorithms for load flow calculation are mentioned, with their principles introduced and merits & defaults compared. The problems at present and the prospect of future are discussed in the end.
Research Status Review of Robots Applied in Substations for Equipment Inspection
Yang Xudong;Huang Yuzhu;Li Jigang;Li Li;Li Beidou;Inner Mongolia Power(Group)Co.,LTD Baotou Power Supply Bureau;Shandong Luneng Intelligence Technology Co.,LTD;T he substation inspection robot is an intelligent robot with infrared and visible camera to inspect and analyze the condition of the equipment instead of people.There are many countries have been study on the robotics technology,including Japan,China,Canada and Brazil.We introduce the technology research status and the generalization of the robot applied in the substation.
[Downloads: 4,366 ] [Citations: 290 ] [Reads: 71 ] HTML PDF Cite this article
Research on Fuzzy PID Control Method Combined Fuzzy Theory and Conventional PID Control
Fuzzy control and PID control are often used in industrial control area.However,a single fuzzy control or PID control can not satisfy the need of the rising complexity and precision of control systems.This paper deeply analyzed the advantages and the disadvantages of fuzzy control and PID control,and proposed a new fuzzy PID control combined fuzzy control and PID control.The simulation results show that the proposed method can effectively reduce the overshoot of the control system,accelerate the response speed,and shorten the adjustment time,thus,the method can enhance the dynamic performance of the control systems.
[Downloads: 3,883 ] [Citations: 168 ] [Reads: 89 ] HTML PDF Cite this article
Study on Performance and Application of Lithium Iron Phosphat Battery
Zhang Song,Ding Guangqian,Hu Tiejun,et alThe lithium iron phosphate(LiFePO4) battery has advantages of high voltage,energy density,long service life,safety performance,low self-discharge rate and no memory effect.This paper introduced the structure of LiFePO4 battery,the principle of charging and discharging.It introduced the structure of LiFePO4 battery energy storage system and discussed the principle of energy conversion system.It also studied the applications of LiFePO4 battery which is widely used in stable supply of renewable energy such as wind power,solar power,peak load shifting,electric vehicles,distributed power and uninterruptible power supply.
[Downloads: 3,788 ] [Citations: 92 ] [Reads: 72 ] HTML PDF Cite this article
Progress in Synthesis and Application of Perovskite Photovoltaic Materials
CHENG Fang;Photovoltaic power generation has significant energy,environmental and economic benefits,and can significantly reduce carbon emissions.It will become the main source of global energy supply in the future.With the gradual improvement of society's awareness of energy greening and the advancement of chemical synthesis technology,the research and development of high photoelectric conversion efficiency solar cells has become a current research hotspot. Among them,perovskite(ABX3)materials have become one of the most promising materials for new-generation solar cells due to their high photoelectric conversion efficiency,low cost,and strong optical tunability.The principle and development status of perovskite solar cells was introduced. Then,the technical advantages and development prospects of different types of solar cells from the perspective of different chemical compositions were analyzed and compared,including organic-inorganic hybrid perovskite solar cells,inorganic perovskite solar cells,nanoscale inorganic perovskite materials and other types of solar cell materials,which provide a reference for the next step in the development of perovskite high conversion efficiency photovoltaic materials synthesis technology.
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