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more..Status and Prospects of Pilot Projects of Multi-energy Systems in Alpine Region
ZHAO Yuehao;SUN Yun;WANG Yue;LI Zhiyi;State Grid Jining Power Supply Company;Multi-energy systems in alpine areas promote renewable energy consumption through multi-energy complementarity and synergy,enhancing the system's overall energy efficiency. The status of multi-energy systems pilot projects in alpine areas,both domestically and internationally,is reviewed and analyzed.Practical experiences from these pilot projects are also summarized. The projects demonstrate that constructing multi-energy systems in alpine areas can facilitate the use of intermittent renewable energy,improve energy efficiency,and enhance operational economy.By comparing these pilot projects,differences and gaps are identified.Based on the current development status of multi-energy systems in China's alpine regions,recommendations are proposed for future development.
Risk Response and Regulation of Multi-energy Coupling Systems Considering Flexible Resources Participation
HE Rongkai;LI Wanxin;TANG Hua;ZHANG Tao;PAN Chao;State Grid Liaocheng Power Supply Company;Aiming at the characteristics of high latitude and severe cold climate in Northeast China,the safety response and regulation of an electric-gas-heat multi-energy coupling system in risk scenarios under extreme conditions are studied.Firstly,the composition of each energy flow system is analyzed,and the flexible resources in the domain are mined to enhance their ability to participate in multi-energy flow interaction.Secondly,considering the extreme conditions,a risk mitigation system is proposed. A risk definition criterion is constructed to categorize the risk types on both the source and load sides,the risk identification index is used to explore the weak links of the network side,and the risk guarantee strategy is formulated according to the supply guarantee state.Then,a flexible collaborative layering model is built to regulate and evaluate the system operation from the aspects of risk assessment,flexible resistance,power supply stability and economic operation.Finally,taking the actual systems in Northeast China and Shandong Province as the objects of study,the operation effect of various schemes is analyzed,and the benefits of stability,flexibility,economy and low carbon are evaluated.The results show that the exploration of flexible resources can improve the system's ability to resist extreme conditions.In the two typical risk scenarios,the system's security indicators are improved by 0.72 and 0.43 percentage points,respectively,and the flexibility is improved by 4.83 and4.90 percentage points,respectively.At the same time,the participation of low-carbon units in regulation further reduces the system's risk by 1.85 and 8.93 percentage points,respectively,which verifies that the hierarchical model based on the risk mitigation system can effectively reduce the impact of supply and demand imbalance risks on the system.
Analysis and Optimization of Low-temperature Stability of Ground Wire Energy Harvesting Device
ZHAO Dongsheng;FAN Yazhou;WANG Kaijin;YANG Jun;Electric Power Research Institute of Guangdong Power Grid Corporation;In winter,the output power of the ground wire energy harvesting current transformer(represented as TA)often falls short.To investigate the causes and solutions of this phenomenon,a finite element model of the existing ground wire energy harvesting TA is established and a finite element thermal-structural coupling simulation is conducted.It is found that the ground wire energy harvesting TA deforms in low temperature environments,and this deformation causes the core of the TA to separate at the bonding surface.Based on the characteristics of the induced current in overhead lines and the working principle of the ground wire energy harvesting TA,the influence of the deformation on the output power is analyzed in detail.To address the issue of air gaps forming at the core contact interface of the TA due to deformation in low temperatures,a new TA structure design is proposed to reduce its low-temperature deformation.The simulation shows that the deformation caused by temperature fluctuations in the optimized TA is significantly reduced.Two ground wire energy harvesting TAs are tested for low-temperature energy harvesting in a low-temperature test chamber,and the output results of the two TAs are compared.The results demonstrate that the optimized TA improves the stability of the output power of the ground energy harvesting device under low-temperature conditions.
A Forecasting-aid State Estimation Method for Distribution Networks With False Data Injection Attack Detection
ZHANG Sheng;JIANG Yusen;LIN Tong;RUAN Xinyu;XU Junjun;The distribution network state estimation(SE)combined with cyber-physical systems(CPS)faces challenges such as data explosion and malicious attacks from hackers,affecting the accurate perception of the system operation state. A dynamic SE method for false data injection attack(FDIA)detection is proposed to effectively address FDIAs in distribution networks.Firstly,a general imperfect FDIA model is introduced,which simulates real-world attack behavior through random disturbances,providing a theoretical foundation for subsequent detection methods. Secondly,a measurement transformation technique is employed to centralize dispersed measurement data,addressing the issue of inadequate measurement accuracy in distribution networks.Building on this foundation,a dynamic state estimation algorithm for distribution networks is proposed,which integrates multi-source measurement data and leverages anadaptive unscented Kalman filter(AUKF)for state correction.Additionally,the projection statistics(PS)method effectively detects and suppresses disruptive outliers,enhancing the network's adaptability and robustness to FDIA. Finally,simulations conducted on an improved IEEE 33-node test system demonstrate that the proposed method significantly improves state estimation accuracy and enhances FDIA detection accuracy,providing essential technical support for the secure and stable operation of distribution networks.
Meshing and Load Clustering in Distribution Networks Based on Improved K-means and Cluster Generative Adversarial Network
XU Chunlei;JIAO Hao;MA Zhoujun;XIAO Maoran;YIN Junjie;To optimize the load clustering strategy in distribution network grid space and improve the accuracy and efficiency of load clustering,this paper proposes a meshing and load clustering method in distribution network grid space based on improved K-means and cluster generative adversarial network(Cluster-GAN). The method performs preliminary meshing of distribution network load data by improved K-means algorithm,and then uses Cluster-GAN for refined clustering of gridded load data. Firstly,the initial processing of the distribution network load data is performed by introducing the improved K-means algorithm based on the integrated meshing metrics. Subsequently,a Cluster-GAN model incorporating clustering loss is used to perform deep clustering analysis of complex load data within the grid.By generating sample data rich in clustering information,Cluster-GAN achieves efficient clustering in potential space,which effectively circumvents the difficulty that traditional clustering methods are prone to fall into local optimum,and significantly improves the accuracy and efficiency of load clustering.Simulation results show that the method can accurately depict the load distribution characteristics of the distribution network,which lays a solid data foundation and technical support for the scientific management and accurate portrayal of the distribution network and loads under the new power system.
Analysis of Multi-objective Low-carbon Optimization Paths for Power Transmission and Transformation Project Construction
ZHANG Feng;FANG Jingyu;LI Chao;FANG Mengxiang;CHEN Jing;Low-carbon implementation of power transmission and transformation project construction is a key enabler of green and low-carbon transformation in the field of power construction.Focusing on material and technical emission reduction,this paper develops a low-carbon optimization framework for power transmission and transformation project construction from four aspects:Low-carbon materials,low-carbon energy,integrated layouts,and prefabricated components.Taking the construction of a 500kV power transmission and transformation project as an example,through a quantitative carbon emission model of power transmission and transformation project construction and non-dominated sorting genetic algorithm Ⅱ(NSGA-Ⅱ),a comprehensive evaluation is conducted on the low-carbon optimization path for power transmission and transformation project construction based on these low-carbon measures,focusing on the emission reduction level and emission reduction cost,to identify the emission reduction potential and the most cost-effective emission reduction opportunities of the low-carbon path for power transmission and transformation project construction.The research results show that 15 low-carbon optimization paths for power transmission and transformation project construction can be identified.The carbon emission reduction rates of these optimization paths range from 0.72% to 39.95%,and the emission reduction costs range from-1 350.74 to 280.22 yuan per ton.These low-carbon optimization paths can provide solution selection and practical reference for the low-carbon implementation of power transmission and transformation project construction and the low-carbon transformation in the field of power construction.
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Virtual Circuit Closed-loop Identification Model and Method for Black Box Controller of Grid-forming Converter-based Energy Storage
QI Xiaoxiao;WANG Lichao;MA Jian;YU Yongjun;ZHANG Yuan;Grid-forming(GFM)converter-based energy storage has the ability to provide frequency and voltage support,which can improve the stability of high-proportion renewable energy power systems.However,due to the secrecy of the technology,the white-box model that depicts the dynamics of GFM converter-based energy storage cannot be directly obtained,which makes it difficult to accurately analyze its response characteristics. Therefore,a closed-loop model is proposed for parameter identification of GFM converter-based energy storage control black box to improve the flexibility of identification scene construction and the accuracy of parameter solving.Firstly,given the lack of adaptability of the existing identification methods to the change of power grid operation state,the source-network interaction characteristics of the converter and the power grid are abstracted into virtual circuits,and the closed-loop model is constructed from the physical essence of power transmission.Secondly,in view of the increase of complexity and the decrease of accuracy caused by the coupling of multiple series control links,a parameter identification method based on virtual steady state operation points was proposed to realize the decoupling of control parameters in different loops.Finally,the effectiveness of the closed-loop model for parameter identification is verified by simulation,and the results show that there is a decoupling condition for the coupling parameters at the virtual steady-state operation point,and the proposed method can significantly reduce the complexity of parameter solving and improve the identification accuracy.
[Downloads: 63 ] [Citations: 0 ] [Reads: 0 ] HTML PDF Cite this article
Dual layer interactive operation strategy of integrated energy system based on low-carbon comprehensive demand response
WANG Hongxi;SHEN Hongtao;FENG Bo;WANG Hongying;YAN Chao;LI Mengyu;Against the backdrop of the ongoing dual-carbon initiative,unlocking the potential of source-load interaction in energy conservation and carbon reduction has become a key pathway to promote the low-carbon transformation of integrated energy systems. This paper proposes a dual-layer low-carbon scheduling model for integrated energy systems based on comprehensive low-carbon demand response.First,a multi-energy coupled carbon emission matrix is constructed to clarify the transmission relationships of carbon emissions during the conversion among electricity,heat,and gas. Building on this foundation,a dynamic carbon emission factor calculation method is developed to enable accurate quantification of carbon intensity across multiple energy carriers.Then,a dual-layer scheduling architecture is established,wherein dynamic carbon emission factors function as interactive signals.In the upper layer,the integrated energy system performs multi-energy device scheduling and iteratively updates the carbon emission factors.In the lower layer,a load aggregator aggregates user loads and implements low-carbon demand response strategies.Through iterative feedback between the two layers,the model achieves a coordinated evolution of emission factors and demand response strategies. Finally,simulation results demonstrate that the proposed strategy significantly reduces overall carbon emissions and enhances the utilization of renewable energy,while maintaining economic efficiency.
[Downloads: 158 ] [Citations: 0 ] [Reads: 0 ] HTML PDF Cite this article
Research on Optimal Operation Method of Port Microgrid Based on Berth and Quay Crane Scheduling
YU Jianyang;NIU Tao;WU Wei;LIU Lingyan;GAO Haili;The high energy consumption and pollution characteristics of the shipping industry are becoming more and more prominent with the increase of trade volume.Consequently,the development of electrification has become a necessary pathway for the green transformation of the shipping sector.We propose a joint day-ahead scheduling method to jointly optimize the operation strategy of the port logistics system and the energy system through the cooperative functioning of the shore power system and the port microgrid. The method establishes a coupled logistics-energy model for the port power grid,comprehensively considering factors such as the ship berthing time,shore bridge operation sequence,shore power demand curve and microgrid dynamic tariffs. It also considers the uncertainty of the port living load forecast and renewable energy output. Furthermore,the study investigates the flexible synergistic mechanisms of multiple shore bridges,and proposes a scheduling strategy that integrates load leveling with time-of-use tariff differentials.This approach aims to reduce energy costs and alleviate pressure on the microgrid.Examples show that the proposed joint scheduling algorithm can enhance the energy independence,port operation efficiency,reliability,and economic performance of port microgrids compared with the traditional berth allocation strategy.
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Flexible Resource Aggregation Feasible Region of Port Power Network and Its Characterization Method
YU Jianyang;WU Wei;GAO Haili;NIU Tao;LI Min;The continuous advancement of port electrification and the increasing penetration of distributed renewable energy underscore the necessity of harnessing the adjustable potential of distributed resources within port areas.This approach can provide significant insights intothe flexible interaction between port area grids and the main power grid,as well as enhance the overall flexible operation of port area grids. To this end,introduce the concept of the flexible resource aggregation feasible region for port areas. By considering the operational constraints of port area grids and the operational characteristics and adjustable potential of distributed resources,such as photovoltaics,cold chain logistics,and energy storage,a flexible resource aggregation feasible region model suitable for port areas is established.Given the stochastic nature of renewable energy and the uncertainties associated with load forecasting in port power networks,the flexibility aggregation is described as a series of stochastic optimization problems. A convex hull vertex search algorithm is designed to approximate the boundaries of the flexible resource aggregation feasible region.Finally,simulations based on a modified IEEE 33 bus distribution system for a port power network substation are conducted to validate the effectiveness of the proposed flexible resource aggregation feasible region method for port areas.
[Downloads: 92 ] [Citations: 0 ] [Reads: 0 ] HTML PDF Cite this article
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: 154 ] 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: 111 ] 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: 118 ] 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: 78 ] 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: 154 ] 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: 111 ] 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: 78 ] 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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