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A Scenario-classification Hybrid-based Banding Method for power Transfer Limits of Critical Inter-co.ridors

Journal of Modern power Systems and Clean Energy 2024年第2期12卷 547-560页

作者： Lidong Yi Maosheng Ding Jili Wang Gao Qiu Fei Xue Ji'ang Liu Yuxiong Huang Gengfeng Li Junyong Liu state grid Ningxia electric power co. Ltd.YinchuanChinaand M.Ding is also with State Grid Ningxia Electric Power Research InstituteYinchuanChina Northwest Branch State Grid Corporation of ChinaXi’anChina School of electrical Engineering Sichuan UniversityChengduChina state grid Ningxia electric power Research Institute Yinchuan YinchuanChina School of electrical Engineering Xi’an Jiaotong UniversityXi’anChina IEEE

To secure power system operations,practical dispatches in industries place a steady power transfer limit on critical inter-co.ridors,rather than high-dimensional and strong nonlinear stability ***,co.putational co.plexities lead to over-co.servative pre-settings of transfer limit,which further induce undesirable and non-technical co.gestion of power *** co.quer this barrier,a scenario-classification hybrid-based banding method is proposed.A cluster technique is adopted to separate similarities from historical and generated operating co.dition *** a practical rule,transfer limits are approximated for each operating ***,toward an interpretable online transfer limit decision,co.tsensitive learning is applied to identify cluster affiliation to assign a transfer limit for a given *** this stage,critical variables that affect the transfer limit are also picked out via mean impact *** enables us to co.struct low-co.plexity and dispatcher-friendly rules for fast determination of transfer *** numerical case studies on the IEEE 39-bus system and a real-world regional power system in China illustrate the effectiveness and co.servativeness of the proposed method.

关键词： Transfer limit transfer capability power transfer inter-co.ridor cluster co.t-sensitive learning banding power system operation

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Efficiency-oriented vehicle relocation of shared autonomous electric fleet in station-based car-sharing system

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Journal of Traffic and Transportation Engineering(English Edition) 2024年第4期11卷 681-699页

作者： Ning Wang Hangqi Tian Jiahui Guo Huahua Wu Jian Lyu School of Automotive Studies Tongji UniversityShanghai 201804China state grid Zhejiang electric power co. Ltd.Hangzhou 310007China state grid Zhejiang electric Vehicle Service co. Ltd.Hangzhou 310012China

Long waiting delays for users and significant imbalances in vehicle distribution are bothering traditional station-based one-way electric car-sharing system *** address the problems above,a“demand forecast-station status judgement-vehicle relocation”multistage dynamic relocation algorithm based on the automatic formation cruising technology was proposed in this *** stage one,a novel trip demand forecast model based on the long short-term memory network was established to predict users'car-pickup and car-return order volumes at each *** stage two,a dynamic threshold interval was determined by co.bining the forecast results with the actual vehicle distribution among stations to evaluate the status of each *** vehicle-surplus,vehicleinsufficient,vehicle-normal stations,and the number of surplus or insufficient vehicles for each station were *** stage three,setting driving mileage and carbon emission as the optimization objectives,an integer linear programming mathematical model was co.structed and the optimal vehicle relocation scheme was obtained by the co.mercial solver *** 43 stations and 187 vehicles in Jiading District,Shanghai,China,as a case study,results showed that rapid vehicle rebalancing among stations with minimum carbon emissions co.ld be realized within 15 min and the users’car-pickup and car-return demands co.ld be fully satisfied without any refusal.

关键词： Sustainable transportation One-way car-sharing Shared autonomous electric fleet Multistage dynamic relocation algorithm

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Stability Analysis of DC-DC co.verters with Energy Balance co.trol

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CSEE Journal of power and Energy Systems 2023年第5期9卷 1765-1773页

作者： Lei Wang Yang Liu Yongliang Guo Qing-Hua Wu Guangfu Tang School of electric power Engineering South China University of TechnologyGuangzhou 510641China state grid Smart grid Research Institute co. Ltd.Beijing 102209China

With variation of parameters,DC-DC co.verters may change from a stable state to an unstable state,which severely degrades the performances of the co.verter *** this article,by establishing the state-space average model,the stability and bifurcation of a boost and a buck-boost co.verter with energy balance co.trol(EBC)is studied,*** the stability boundary and stable parameter domains are accurately *** obtained stability region provides a parameter regulating range for co.verter ***,co.pared with the one-cycle co.trol(OCC)method,the EBC possesses an extended stable parameter domain,while avoiding unstable behaviors such as Hopf bifurcation,Quasi-periodic Oscillation even chaos,*** theoretic analysis is well validated through simulation and experiment.

关键词： DC-DC co.verter energy balance co.trol average model slow-scale stability

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A New Topology Pattern for AC-DC Mixed Microgrid

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Journal of Electronic Science and Technology 2016年第3期14卷 281-286页

作者： Peng Yu Yong Zhang Xing-Hua Liu Peng Zhao Sun Li Rui-Qi Wang Shu-Min Sun Guang-Lei Li Yu-Yao Qu Lin Li the state grid Shandong electric power Research Institute Jinan 250002China the state grid Zibo electric power co.pany Zibo 255000China the state grid Shandong electric power co.poration Jin 250000Chin. the state grid Dongying electric power co.pany Dongying 257100China the Zhongshi Yitong Group co.Ltd. Jinan 250002China

In order to realize the modular design of the microgrid, this paper proposed a new modular topology for the AC-DC mixed microgrid. In that topology, the AC microgrid unit and the DC microgrid unit were packaged together by the back-to-back co.verter. The battery-supercapacitor hybrid energy storage system was co.nected to the DC bus of back-to-back co.verter. By the reasonable design on the battery-supercapacitor hybrid system, the energy storage system co.ld supply the rapid power and energy support for the microgrid spontaneously. The mathematical model and the co.trol algorithm of that microgrid topology were studied. By the simulation analysis, it can be co.cluded that AC-DC mixed modular microgrid topology co.ld operate steadily on both the grid-co.nected mode and the isolated mode. Furthermore, we can co.clude by the simulation that the designed modular microgrid co.ld operate uninterrupted when the microgrid topology switched from the grid-co.nected mode to the isolated mode. The seamless switching became the natural property for the modular microgrid. As a result, the modular microgrid topology can be co.sidered as a usual power/load module to realize the friendly power interaction with the power grid.

关键词： Microgrid topology energy storage mode switching operation mode.

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The Static Stability Region of an Integrated electricity-Gas System co.sidering Voltage and Gas Pressure

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Engineering 2024年第5期36卷 132-145页

作者： Yunfei Mu Zhibin Liu Xiangwei Guo Hongjie Jia Kai Hou Xiaodan Yu Bofeng Luo Hairun Li Key Laboratory of Smart grid of Ministry of Education Tianjin UniversityTianjin 300072China state grid Tianjin electric power co.pany Tianjin 300201China China Southern power grid Digital grid Research Institute co. Ltd.Guangzhou 510700China

In an integrated electricity-gas system(IEGS),load fluctuations affect not only the voltage in the power system but also the gas pressure in the natural gas *** static voltage stability region(SVSR)method is a tool for analyzing the overall static voltage stability in a power ***,in an IEGS,the SVSR boundary may be overly optimistic because the gas pressure may co.lapse before the voltage ***,the SVSR method cannot be directly applied to an *** this paper,the co.cept of the SVSR is extended to the IEGS-static stability region(SSR)while co.sidering voltage and gas ***,criteria for static gas pressure stability in a natural gas system are proposed,based on the static voltage stability criteria in a power ***,the IEGS-SSR is defined as a set of active power injections that satisfies multi-energy flow(MEF)equations and static voltage and gas pressure stability co.straints in the active power injection space of natural gas-fired generator units(NGUs).To determine the IEGSSSR,a co.tinuation MEF(CMEF)method is employed to trace the boundary point in one specific NGU scheduling direction.A multidimensional hyperplane sampling method is also proposed to sample the NGU scheduling directions *** obtained boundary points are further used to form the IEGSSSR in three-dimensional(3D)space via a Delaunay triangulation hypersurface fitting ***,the numerical results of typical case studies are presented to demonstrate that the proposed method can effectively form the IEGS-SSR,providing a tool for IEGS online monitoring and dispatching.

关键词： Integrated electricity-gas system Static stability region co.tinuation multi-energy flow Multidimensional hyperplane sampling

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co.rdinated Voltage co.trol of Distribution Network co.sideringMultiple Types of electric Vehicles

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Energy Engineering 2024年第2期121卷 377-404页

作者： Liang Liu Guangda Xu Yuan Zhao Yi Lu Yu Li Jing Gao state grid Jibei electric power Research Institute(North China electric power Research Institute co. Ltd.)Beijing100045China

The co.ple between the power network and the transportation network(TN)is deepening gradually with the increasing penetration rate of electric vehicles(EV),which also poses a great challenge to the traditional voltage co.trol *** this paper,we propose a co.rdinated voltage co.trol strategy for the active distribution networks co.sidering multiple types of *** the first stage,the action of on-load tap changer and capacitor banks,etc.,are determined by optimal power flow calculation,and the node electricity price is also determined based on dynamic time-of-use tariff *** the seco.d stage,multiple operating scenarios of multiple types of EVs such as cabs,private cars and buses are co.sidered,and the scheduling results of each EV are solved by building an optimization model based on co.straints such as queuing theory,Floyd-Warshall algorithm and traffic flow *** the third stage,the output power of photovoltaic and energy storage systems is fine-tuned in the normal co.trol *** charging power of EVs is also regulated in the emergency co.trol mode to reduce the voltage deviation,and the amount of regulation is calculated based on the fair voltage co.trol mode of ***,we test the modified IEEE 33-bus distribution system co.pled with the 24-bus Beijing *** simulation results show that the proposed scheme can mitigate voltage violations well.

关键词： electric vehicle transportation network voltage co.trol queuing theory

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Failure mechanism of metallized film capacitors under DC field superimposed AC harmonic:From equipment to material

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High Voltage 2024年第5期9卷 1081-1089页

作者： Zhiyuan Li Yihan Zhou Xuguang Wang Hongbo Liu Lu Cheng Wenfeng Liu Shengtao Li Jiang Guo Yang Xu state Key Laboratory of electrical Insulation and power Equipment School of Electrical EngineeringXi'an Jiaotong UniversityXi'anChina state Key Laboratory of power grid Environmental Protection WuhanChina state grid Jiangsu electric power co. Ltd.Research InstituteNanjingChina

This study focuses on the degradation behaviour of metallised film capacitors,which are the essential co.ponents for the stability of co.verter valves in flexible ultra-high voltage direct current(HVDC)transmission *** systematic experimentation,we investigated the failure mechanisms of MFCs under HVDC fields with superimposed harmonics,co.sidering both equipment and material *** experiments subjected capacitors to 500 h of ageing under two co.ditions:a DC/AC-superimposed field with a co.stant DC co.ponent of 290 kV/mm and an AC ripple rate varying from 12%to 28%,and a co.trol group aged solely under a DC *** findings indicate that capacitors aged under the DC/AC-superimposed field exhibited shorter lifespans and more significant capacitance loss than those aged under only the DC *** difference in performance is primarily attributed to the distinct electrode loss behaviours observed under each ageing co.dition,which are key factors in the capacitors'capacitance ***,the biaxially oriented polypropylene films in the DC-aged samples showed more severe deterioration,characterised by more noticeable molecular chain scission and reduced breakdown strength,co.pared to those aged under the DC/AC superimposed *** difference is partly due to the moderate temperature increase caused by harmonics,which benefits the aggregation structure,and partly to the reduced molecular structure damage from the AC field.

关键词： film harmonics field

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Study on multi-timescale operation of hydrogen-co.taining energy co.pled with transportation system

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Clean Energy 2024年第3期8卷 79-94页

作者： Xingang Wang Zhiyong Yu Jiayu Bian Jin Yu state grid Xinjiang electric power co LTD.Urumqi830000China state grid Xinjiang electric power Eco.omic and Technology Research Institute Urumqi830000China

With the widespread attention on hydrogen energy,the operation optimization of the co.pling system of hydrogen energy and transportation has beco.e a critical ***,this study develops a hydrogen-co.taining energy transportation co.pling system for the system co.laborative operation framework,operation mode and equipment modelling of the ***,a medium-to long-term operation optimization model and a short-term operation optimization model were co.structed co.sidering the differences in the operation of co.pled systems at different timescales and operating co.ts as the objective function and power balance and system equipment as *** the medium-and long-term operation optimization model,the planning scenario reduction method is used to reduce the wind power generation *** the short-term operation optimization model,a multivariate uncertainty model is co.structed to represent the uncertainty in the co.pling ***,the solution method of the model is ***,a co.pled system is simulated to verify the effectiveness of the model.(i)When the initial scene set is 600,the typical scene reduction method using Latin hypercube sampling and the Wasserstein distance can reduce operating co.ts by 7.60%and 9.49%co.pared with K-means reduction and K-media reduction methods.(ii)The sensitivity co.fficients of hydrogen sales price,electricity sales price and maintenance rate to operating co.ts are-0.031%,-1.009%and 0.0105%,respectively.(iii)co.sidering multiple uncertainties can help make optimal decisions based on the overall co.sideration of disadvantage scenarios,thereby reducing system operating co.ts.

关键词： hydrogen-co.taining energy system transportation system multi-timescale operation optimization

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co.trolling structural vibrations in wind turbines by co.structing function V

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Science China(Technological Sciences) 2015年第7期58卷 1186-1195页

作者： DENG Ying GAO Jie TIAN De ZHOU Feng GAO Shang ZHAO Ming Institute of Renewable Energy North China Electrical Power University state Key Laboratory of Alternate electrical power System with Renewable Energy Sources (NCEPU) Yunnan electric power grid co. Power Research Institute

For a variable speed large scale wind turbine, the vibration issues beco.e a key problem that cannot be ignored in the turbine＇s life cycle. Wind turbine tower vibration will cause superfluous mechanical loads. To resolve the vibration issue, a method for co.structng the energy function V is proposed to meet the demands of safe operation. The Lyapunov theorem has been em- bedded in a wind turbine co.trol algorithm, proving the theoretical feasibility of stability co.trol based on function V. Acco.d- ing to an analysis of this co.plex nonlinear model for the wind turbine, the general method of co.structing an energy function suitable for a wind turbine is presented explicitly. The feasibility of applying an energy function to wind turbine vibration co.- trol is verified experimentally using a 3.0-MW direct drive wind turbine model. The experimental results indicate that the dy- namic performance of the tested wind turbine model with energy function co.trol is significantly better than that of the unco.- trolled structure in terms of the reduction of nacelle acceleration, velocity, and displacement response.

关键词： wind energy stability analysis vibration co.trol Lyapunov theorem

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Detection of Nonlinear Behavior Induced by Hard Limiting in Voltage Source co.verters in Wind Farms Based on Higher-order Spectral Analysis

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Journal of Modern power Systems and Clean Energy 2024年第2期12卷 630-645页

作者： Zetian Zheng Shaowei Huang Qiangsheng Bu Chen Shen Jun Yan state Key Laboratory of power Systems Department of Electrical EngineeringTsinghua UniversityBeijing 100084China state grid Jiangsu electric power co. Ltd.Research InstituteNanjingChina

In recent years, sub-synchronous oscillation accidents caused by wind power integration have received extensive attention. The reco.ded co.stant-amplitude waveforms can be induced by either linear or nonlinear oscillation mechanisms. Hence, the nonlinear behavior needs to be distinguished prior to choosing the analysis method. Since the 1960s, the higher-order statistics(HOS) theory has beco.e a powerful tool for the detection of nonlinear behavior(DNB) in production quality co.trol wherein it has mainly been applied to mechanical co.dition monitoring and fault diagnosis. This study focuses on the hard limiters of the voltage source co.verter(VSC) co.trol systems in the wind farms and attempts to detect the nonlinear behavior caused by bi-or uni-lateral saturation hard limiting using the HOS analysis. First, the co.ventional describing function is extended to obtain the detailed frequency domain information on the bi-and uni-lateral saturation hard limiting. Furthermore, the bi-and tri-spectra are introduced as the HOS, which are extended into bi-and tri-co.erence spectra to eliminate the effects of the linear parts on the harmonic characteristics of hard limiting in the VSC co.trol system, respectively. The effectiveness of the HOS in the DNB and the classification of the hard-limiting types is proven, and its detailed derivation and estimation procedure is presented. Finally, the quadratic and cubic phase co.pling in the signals is illustrated, and the performance of the proposed method is evaluated and discussed.

关键词： Bi-co.erence spectrum detection of nonlinear behavior hard limiting higher-order statistics tri-co.erence spectrum voltage source co.verter wind farms.

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