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more..Research on Adjustable Potential Evaluation Methods of Flexible Electrical Loads in Inland River Ports
TANG Yanmei;LI Bin;YU Janyang;XUE Li;ZHANG Yuanxing;GAO Peng;State Grid Changzhou Power Supply Company;With the in-depth advancement of China's “Dual Carbon” strategy,the electrification of inland river port areas has undergone comprehensive acceleration. These port areas posses abundant flexible load resources and significant adjustable potential. However,due to the diversity of load types and substantial differences in operational characteristics,effective quantitative assessment methods for adjustable potential remain lacking,which limits improvements in utilization efficiency. To address this challenge,a methodology is proposed for quantifying the adjustable potential of flexible electrical loads in inland river port areas.The primary flexible electrical loads—air conditioning systems,reefer containers,electric heavy-duty trucks,port machinery,and shore power systems—are classified into three categories based on operational characteristics:generalized energy storage loads,shiftable loads,and demand-responsive loads. By comprehensively considering multi-dimensional dynamic factors such as ambient temperature,equipment operating parameters,logistics schedules,and vessel berthing status,refined load models are established to identify sources of adjustable potential for each load category.Furthermore,an evaluation index system is developed,and a spatial-temporal estimation method is proposed to quantify the adjustable potential of port loads.Finally,through analysis of typical daily operational data from an inland river port,minute-level quantification of the adjustable potential for flexible electrical loads is achieved,providing theoretical support for optimizing resource allocation and enhancing dispatch efficiency in port energy systems.
Steady State Security Region Analysis of Multi-energy Station Considering Renewable Energy Access
LIU Bo;WANG Dong;CHEN Shijun;XU Dunbin;ZHAO Yuan;MENG Fanlin;State Grid Xuzhou Power Supply Company;An integrated electricity-heat energy station model is established,which systematically captures the energy demand of each energy station,electrical loads,active/reactive power outputs from photovoltaic units,network topology configurations,and relevant technical parameters,including line resistances and reactances.Operation constraints are constructed to ensure system meets its operational requirements,with safety operation boundaries for the coupled energy system concisely formulated.The steady-state safe region is subsequently derived through rigorous mathematical derivation processes,where renewable energy fluctuations are comprehensively accounted for using probabilistic power injection models.Furthermore,it can ensure the maximum energy supply capacity of the entire system,even in the event of a failure of one device within the energy station fails.Based on the operation constraints of the coupled system and the representation of the steady-state safe region,the quasigradient system(QGS)method in nonlinear dynamical systems is employed to explore a comprehensive representation of the steady-state safe region in nonlinear dynamical systems.Subsequently,the numerical trajectory unification(TJU)method of non-hyperbolic dynamical systems is used to calculate the boundary of the steady-state safe region for non-hyperbolic dynamical systems.This paper can effectively represent the steady-state safe region of a multi-integrated energy station and demonstrates considerable certain robustness,significantly reducing the errors associated with traditional methods.
Collaborative Planning for Distributed Photovoltaic and Electric Vehicle Charging Station Considering Charging Demand Capturing
WANG Kexin;YANG Shenquan;LIU Zhao;ZHAO Ren;YU Qiuyang;WANG Yanshuo;Driven by the strategy of “carbon peaking and carbon neutrality” target,the power distribution networks(PDNs)are integrated with generous electric vehicles(EVs)and distributed photovoltaics(PVs).This integration presents significant challenges for the operation of distribution networks. Implementing collaborative planning for distributed PVs and charging stations,while leveraging the complementary roles of energy sources and loads,is crucial for enhancing the hosting capacity of the distribution network and improving charging convenience for users.However,the demand for EV charging is affected by traffic flow and various other factors,exhibiting heterogeneous characteristics in both spatial and temporal distribution.This variability significantly impacts the planning of charging stations. To address these challenges,we propose a collaborative planning approach for distributed PV and EV charging station that takes into account the capture of charging demand.First,we introduce a charging demand assessment method for charging stations based on the traffic equilibrium model,which quantifies the charging traffic flow at each station under different probabilistic scenarios. This method considers elements such as the uncertainty of user travel demand and is utilized to evaluate the benefits of user charging demand following the construction of charging stations.Building on this foundation,we develop a stochastic optimization-based collaborative planning model for PVcharging stations within distribution networks,accounting for the uncertainties associated with PV output and load variations.Finally,a modified IEEE 33-bus system with a 12-bus transportation network is used as a case study to illustrate the effectiveness of the proposed method.
Low-carbon Operation Optimization of Integrated Energy System Considering Energy Hierarchical Utilization and Hybrid Energy Storage
LI Yiyang;WANG Ming;ZHANG Cunming;WANG Mingyuan;YANG Dongrun;GAO He;HAN Rong;To improve the energy efficiency of existing hydrogen-integrated energy systems,this paper proposes a low-carbon operation optimization method for hydrogen-integrated energy systems that considers the combined impact of energy cascade utilization and hybrid energy storage.Firstly,the paper classifies thermal loads,and proposes a three-stage waste heat recovery strategy for the aforementioned equipment by coordinating the high-grade waste heat generated by the electricity-hydrogen high-temperature coupling equipment in the hydrogen-integrated energy system with traditional waste heat recovery.Secondly,a green certificate-step carbon coupled trading mechanism is put forward to calculate the carbon emissions offset by green certificates.Thirdly,a hybrid energy storage system composed of flywheel energy storage and batteries is adopted to handle fluctuations caused by the changes in electrical power.Finally,an operation and dispatch optimization model for the hydrogenintegrated energy system is established.Taking a park in northern China as an example for case analysis,a dispatch model aiming at minimizing the comprehensive operation cost is constructed,and the economic efficiency and effectiveness of the proposed method are verified through case studies.
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.
Adaptive Dynamic State Estimation Strategy for Distribution Network Containing Photovoltaic-Storage-Charging Integrated Station
ZHAO Haichu;BO Bo;CHANG Muhan;ZHAO Xin;LIAO Shangzhang;Photovoltaic-storage-charging integrated station(PSCIS)can efficiently utilize clean energy by integrating multiple resources such as photovoltaic,energy storage and electric vehicles,and is an important component of the future low-carbon distribution networks.Aiming at the problem of strong coupling of source-load uncertainty caused by photovoltaic and electric vehicle charging loads within PSCIS,and the degraded state estimation accuracy caused by bidirectional energy flow characteristics between PSCIS and the grid,an adaptive dynamic state estimation strategy for distribution networks containing PSCIS is proposed. Firstly,a measurement data identification method considering the spatiotemporal correlation of PSCIS is proposed to effectively distinguish fluctuation data from bad data. Secondly,an adaptive strong tracking unscented Kalman filtering algorithm is designed by introducing the theory of strong tracking filtering into the unscented Kalman filtering algorithm,and based on the results of the data identification,the process/measurement noise covariance matrices are adaptively modified to effectively improve the state tracking capability of the distribution system connected to the PSCIS;Finally,simulations are conducted on the improved IEEE 33-node system containing PSCIS to verify the effectiveness of the proposed strategy.
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Research on Multi-Stage Coordinated Planning Methods for Wind-Gas-Hydrogen in Offshore Oilfield Systems
ZHANG Lei;WANG Su;XUE Tianliang;YE Jing;GAN Xianxin;The growth in energy demand is driving the continuous expansion of offshore oil fields. However,the traditional reliance on gas turbines for power supply faces dual challenges:low energy efficiency and high carbon emissions.To address these issues,a multi-stage planning method based on a wind-gas-hydrogen(WGH)system is proposed to promote the efficient integration of new energy sources with offshore oil fields.First,leveraging the hydrogen-blended combustion characteristics of gas turbines,a WGH system architecture is established that integrates offshore wind power,surplus electricity-based hydrogen production,and natural gas hydrogen blending.Secondly,a multi-stage planning model for the WGH system is established with the objective of minimizing the life-cycle cost under the constraint of offshore operation windows.Then,a budget uncertainty set is introduced to characterize the fluctuations in wind power output and oil field load,and the model is transformed into a solvable mixed-integer linear programming problem through robust optimization.Finally,using a specific offshore oil field in China as a case study,the proposed method is verified to effectively improve the utilization efficiency of new energy and reduce carbon emissions.The results show that this study provides a feasible decision-making basis and technical support for promoting the coordinated development and green integration of marine oil and gas with renewable energy.
[Downloads: 79 ] [Citations: 0 ] [Reads: 0 ] HTML PDF Cite this article
Modeling Method of Distributed Temperature Controlled Loads Aggregation Considering Physical Characteristics and Market Incentives
Liu Xiaoming;Qi Lujie;Liang Xiaolin;Fu Tiancheng;Wang Chen;Shi Xiaohan;The aggregation of distributed controllable resources is pivotal for mitigating source-load uncertainties in nextgeneration power systems. Realizing their full regulatory potential requires a model that couples their physical properties with market dynamics. A modeling framework for distributed thermostatically controlled resources is proposed to accurately assess their regulation capacity under various market incentives. The method first employs a virtual state of charge(SOC)-based state-space model to define the physical dynamics and constraints of the resources. Then,it incorporates a behavioral psychology model to quantify the impact of price incentives on user response. By integrating the physical model,a coordination algorithm,and the incentive response model,a coupled aggregation methodology is established. Simulations confirm that this proposed approach accurately represents an air conditioner cluster as a cohesive,grid-interactive asset,enabling precise assessment of its collective regulation capacity and its sensitivity to market signals.
[Downloads: 63 ] [Citations: 0 ] [Reads: 0 ] HTML PDF Cite this article
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: 186 ] [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: 4,793 ] [Citations: 336 ] [Reads: 239 ] 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: 1,359 ] [Citations: 172 ] [Reads: 147 ] 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: 3,954 ] [Citations: 171 ] [Reads: 139 ] 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: 4,344 ] [Citations: 97 ] [Reads: 89 ] 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.
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: 4,793 ] [Citations: 336 ] [Reads: 239 ] HTML PDF Cite this article
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.
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: 4,344 ] [Citations: 97 ] [Reads: 89 ] 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: 3,954 ] [Citations: 171 ] [Reads: 139 ] 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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