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Analysis of Small Oscillations in Complex electric power systems

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Engineering（科研） 2018年第5期10卷 253-261页

作者： Allaev Kaxramon Raximovich Makhmudov Tokhir Farkhadovich Department “electric Stations Networks and Systems” Tashkent State Technical University Named after Islam Karimov Tashkent Uzbekistan

In this article the mathematical model of complex regulated electric system in matrix form is developed. This mathematical model makes it possible to study the steady-state stability of a complex electrical system by determining the eigenvalues of the dynamics matrix. The model of an electrical system that reflects transient processes for small deviations is convenient, both algorithmically and computationally, in particular, in cases of their joint solution with steady-state equations—the equations of nodal voltages. The obtained results in the form of the eigenvalues of the matrix spectrum are qualitatively the same as the results of classical studies, which is a consequence of the adequacy of the proposed model and the correct reflection of the dynamic processes occurring in a real electrical system. In addition, the equations obtained are of independent importance for the analysis of various modes, including transient, electrical systems of any complexity.

关键词： electric System Small Oscillations Automatic Excitation Control Matrix Matrix Spectrum

Development of a methodology for assessing the adequacy of electric power systems

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Global Energy Interconnection 2022年第5期5卷 543-550页

作者： Dmitry S.Krupenev Denis A.Boyarkin Dmitrii V.Iakubovskii Melentiev Energy systems Institute of Siberian Branch of the Russian Academy of Sciences Lermontov str.130Irkutsk664033Russia

This study presents the results of a research into the developing a methodology for assessing the adequacy of advanced electric power systems characterized by the integration of various innovative technologies,which complicates their *** methodology development is aimed at solving two main problems:(1)increase the adequacy of modeling the processes that occur in the electric power system and (2)enhance the computational efficiency of the adequacy assessment *** study proposes a new mathematical model to minimize the power shortage and enhance the adequacy of modeling the *** model considers quadratic power transmission losses and network *** computational efficiency of the adequacy assessment methodology is enhanced using efficient random-number generators to form the calculated states of electric power systems and machine learning methods to assess power shortages and other reliability characteristics in the calculated states.

关键词： electric power systems Adequacy power shortage minimization Pseudo-and quasi-random number generation Machine learning methods.

Medium-term scheduling of operating states in electric power systems

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Global Energy Interconnection 2022年第5期5卷 472-483页

作者： Aizenberg N. Palamarchuk S. Melentiev Energy systems Institute Siberian Branch of the Russian Academy of Sciences664033130 Lermontov st.IrkutskRussia

This article presents a mathematical model for the medium-term scheduling of the operating states of electric power *** scheduling period is divided into several time *** model can be used to determine the equilibrium state in which each supplier earns maximum profit from supplying electricity to the wholesale *** estimated the maximum value of public welfare,which indicates the total financial gains of suppliers and consumers,to determine the prices at the nodes of the power *** was done by considering the balance constraints at the nodes of the power system and constraints on the allowable values of generation,power flows,and volumes of energy resources consumed over several time *** problem belongs to the class of bi-level Stackelberg game-theoretic models with several *** market equilibrium is modeled simultaneously in several intervals,given the multiplicity and duration of *** considered two approaches for solving the multi-interval equilibrium state *** first approach involved directly solving a system of joint optimality conditions for electricity suppliers and *** second approach involved iterative searches until the equilibrium state was *** article presents the results of medium-term scheduling using a case study of a simplified real-world power system.

关键词： Scheduling Mathematical model Optimality conditions Imperfect competition Equilibrium state Nodal prices.

Simplified Criterion of Steady-State Stability of electric power systems

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Journal of power and Energy Engineering 2015年第4期3卷 224-231页

作者： K. R. Allaev A. M. Mirzabaev T. F. Makhmudov T. A. Makhkamov power Engineering Department Tashkent State Technical University Tashkent Republic of Uzbekistan Mir Solar LLC Tashkent Republic of Uzbekistan power Engineering Department Tashkent State Technical University Tashkent Republic of Uzbekistan Research and Development Department Tecon Groups Moscow Russian Federation

In the paper the simplified criterion of a steady-state stability of electric power systems (EPS) is justified on the basis of Lyapunov functions in a quadratic form ensuring necessary and sufficient conditions of its performance. Upon that, the use of the node-voltage equations allows reducing study of a steady-state stability of complex EPS to study of the generator-bus system. The obtained results facilitate studies of a steady-state stability of the complex systems and have practical importance.

关键词： Steady-State Stability Matrix Method Lyapunov Function Node-Voltage Equations

Statistical Analysis and Energy Planning of electric power Supply systems with Intelligent Control

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Journal of Energy and power Engineering 2014年第4期8卷 702-708页

作者： Valentin Gyurov Vladimir Chikov Department of electric power Supply and electrical Equipment Faculty of Electrical Engineering Technical University- Varna Varna 9010 Republic of Bulgaria

The study presents possibilities for reconstruction of electric power supply systems in Bulgarian Black Sea resorts and possibilities to use statistical methods in energy planning. The paper shows the use of classic statistical methods in combination with advanced digital measurement systems in order to obtain the correlation dependencies, nature of energy consumption and opportunities for energy forecasting. The main purpose of the study is to obtain statistical dependencies of the nature of power consumption and correlations between electricity consumption and ambient temperature in order to improve the accuracy of energy planning. The analysis includes application of energy management systems for proper energy planning, improving economical efficiency and reducing power and energy losses.

关键词： electric power supply energy planning energy forecasting.

Catastrophe Risk Management for electric power Distribution systems:An Insurance Approach

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CSEE Journal of power and Energy systems 2023年第1期9卷 393-410页

作者： Siyuan Sun Gengfeng Li Yiheng Bian Zhaohong Bie Qianwen Hu State Key Laboratory of electrical Insulation and power Equipment Smart Grid Key Laboratory of Shaanxi ProvinceDepartment of Electrical EngineeringXi’an Jiaotong UniversityXi’an 710049China

High-impact,low-probability catastrophes may cause equipment damage,customer outages and serious economic losses to an aging power distribution infrastructure with low redundancy and *** cope with catastrophe risks faced by distribution systems(DSs),insurance is proposed as a supplement to existing resilience enhancement measures,which can provide financial aid in recovery after disasters,as well as incentives to make DSs more resilient to potential *** calls for a quantitative assessment for insurance pricing that can not only predict potential losses caused by future catastrophes but also evaluate the effect of risk management *** this paper,a four-module actuarial framework,including hazard,vulnerability,resilience,and insurance modules,is developed to assess the catastrophe risks of *** on Monte Carlo simulation(MCS)and mixed integer linear programming(MILP),the dynamic characteristics of disasters,random failures of equipment,control measures including fault isolation,load transfer,line patrolling,manual switching,and fault repair,are comprehensively incorporated in the premium determination of catastrophe *** simulations are performed on the modified IEEE 33-bus test systems to illustrate the validity of the proposed catastrophe insurance schemes.

关键词： Actuarial framework catastrophe insurance distribution system risk assessment

Storing Freshwater Versus Storing electricity in power systems with High Freshwater electric Demand

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Journal of Modern power systems and Clean Energy 2024年第2期12卷 323-333页

作者： Mubarak J.Al-Mubarak Antonio J.Conejo Department of electrical and Computer Engineering The Ohio State UniversityColumbusOHUSA Department of electrical Engineering Kuwait UniversityP.O.Box 5969Safat 13060Kuwait Department of Integrated systems Engineering and the Department of electrical and Computer Engineering The Ohio State UniversityColumbusOH 43210USA IEEE

We consider a power system whose electric demand pertaining to freshwater production is high(high freshwater electric demand),as in the Middle East,and investigate the tradeoff of storing freshwater in tanks versus storing electricity in batteries at the day-ahead operation *** storing freshwater and storing electricity increase the actual electric demand at valley hours and decrease it at peak hours,which is generally beneficial in term of cost and ***,to what extent?We analyze this question considering three power systems with different generation-mix configurations,i.e.,a thermal-dominated mix,a renewable-dominated one,and a fully renewable *** generation-mix configurations are inspired by how power systems may evolve in different countries in the Middle *** production uncertainty is compactly modeled using chance *** draw conclusions on how both storage facilities(freshwater and electricity)complement each other to render an optimal operation of the power system.

关键词： power system operation freshwater production and transportation coordination day-ahead scheduling

Energy Planning of Beijing Towards Low-carbon,Clean and Efficient Development in 2035

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CSEE Journal of power and Energy systems 2024年第3期10卷 913-928页

作者： Chengzhou Li Ningling Wang Xiaohu Shen Yumeng Zhang Zhiping Yang Xiaofeng Tong François Maréchal Ligang Wang Yongping Yang Institute of Energy power Innovation North China Electric Power UniversityBeijing 102206China School of Energy Power and Mechanical Engineering and National Research Center for Thermal Power Engineering and TechnologyNorth China Electric Power UniversityBeijing 102206China Industrial Process and Energy systems Engineering Swiss Federal Institute of Technology in LausanneSionSwitzerland

Energy transition towards clean,efficient energy supply has been a common sense of the government and public in ***,lacking reasonable planning will lead to undisciplined development,resource waste,and excessive *** this context,this paper investigates potential pathways of Beijing energy transition towards a high-level low-carbon,clean and efficient energy system in 2035 with an extended energysocpe ***,based on available data,future energy demands are predicted by a newly proposed hybrid forecasting method,which combines the traditional regression model,grey model,and support vector machine model with an entropy-based weighted ***,the superstructure-based optimization model is employed to investigate the system configuration and operation strategy of the future Beijing energy ***,the uncertainty impact of electricity price,natural gas price,hydrogen price,and the capital expenditures of electrolyzer and steam methane reforming for hydrogen applications are *** forecasting results show that all walks of life will witness a continuously increasing energy demand in multiple sectors of Beijing towards *** planning results suggest that the imported electricity and natural gas will dominate the energy supply of Beijing in 2035 with a contribution of 86%of the energy resources consumption of 384 ***,the energy system presents a high end-use electrification level of 65%and high penetration of efficient technologies,which supply 119 TWh via combined heat and power,26 TWh via heat pump and 95 TWh via district heating *** energy use of various sectors of energy resources,technologies and end-use are closely *** will have an increased penetration in the private mobility sector,but the locally generated hydrogen is mainly from steam methane reforming technology.

关键词： Energy transition energy planning carbonneutral demand forecasting energyscope

Localization method of subsynchronous oscillation source based on high-resolution time-frequency distribution image and CNN

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Global Energy Interconnection 2024年第1期7卷 1-13页

作者： Hui Liu Yundan Cheng Yanhui Xu Guanqun Sun Rusi Chen Xiaodong Yu Institute of electric power systems School of Electrical and Electronic EngineeringNorth China Electric Power UniversityBeijing 102206P.R.China electric power Research Institute of State Grid Hubei electric power Co. Ltd.Wuhan 430077P.R.China Central China Branch of State Grid Corporation of China Wuhan 430077P.R.China

The penetration of new energy sources such as wind power is increasing,which consequently increases the occurrence rate of subsynchronous oscillation ***,existing subsynchronous oscillation source-identification methods primarily analyze fixed-mode oscillations and rarely consider time-varying features,such as frequency drift,caused by the random volatility of wind farms when oscillations *** paper proposes a subsynchronous oscillation sourcelocalization method that involves an enhanced short-time Fourier transform and a convolutional neural network(CNN).First,an enhanced STFT is performed to secure high-resolution time-frequency distribution(TFD)images from the measured data of the generation unit ***,these TFD images are amalgamated to form a subsynchronous oscillation feature map that serves as input to the CNN to train the localization ***,the trained CNN model realizes the online localization of subsynchronous oscillation *** effectiveness and accuracy of the proposed method are validated via multimachine system models simulating forced and natural oscillation events using the power systems Computer Aided Design *** results show that the proposed method can localize subsynchronous oscillation sources online while considering unpredictable fluctuations in wind farms,thus providing a foundation for oscillation suppression in practical engineering scenarios.

关键词： Subsynchronous oscillation source localization Synchronous squeezing transform Enhanced short-time Fourier transform Convolutional neural networks