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Applications of survival functions to continuous semi-Markov processes for measuring reliability of power transformers

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Journal of Modern Power Systems and Clean Energy 2017年第6期5卷 959-969页

作者： Yifei WANG mohammad shahidehpour Chuangxin GUO School of Automation Guangdong University of TechnologyGuangzhou 510006China Galvin Center for Electricity Innovation Illinois Institute of TechnologyChicagoIL 60616USA College of Electrical Engineering Zhejiang UniversityHangzhou 310058China

The reliability of power transformers is subject to service age and health *** paper proposes a practical model for the evaluation of two reliability indices:survival function(SF)and mean residual life(MRL).In the proposed model,the periodical modeling of power transformers are considered for collecting the information on health *** corresponding health condition is assumed to follow a continuous semi-Markov process for representing a state *** proportional hazard model(PHM)is introduced to incorporate service age and health condition into hazard *** addition,the proposed model derives the analytical formulas for and offers the analytical evaluation of SF and *** and MRL are calculated for new components and old components,*** both cases,the proposed model offers rational results which are compared with those obtained from comparative *** results obtained by the contrast of the proposed analytical method and the Monte Carlo *** impact of differentmodel parameters and the coefficient of variation(CV)on reliability indices are discussed in the case studies.

关键词： Power system reliability Transformers Proportional hazard model Survival function Mean residual life Semi-Markov process

Optimal sizing of PV and battery-based energy storage in an offgrid nanogrid supplying batteries to a battery swapping station

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Journal of Modern Power Systems and Clean Energy 2019年第2期7卷 309-320页

作者： Mingfei BAN Jilai YU mohammad shahidehpour Danyang GUO Harbin Institute of Technology Harbin 150001China Robert W.Galvin Center for Electricity Innovation Illinois Institute of Technology10 W 35th Street#1600ChicagoILUSA

Nanogrids are expected to play a significant role in managing the ever-increasing distributed renewable energy sources. If an off-grid nanogrid can supply fullycharged batteries to a battery swapping station(BSS)serving regional electric vehicles(EVs), it will help establish a structure for implementing renewable-energyto-vehicle systems. A capacity planning problem is formulated to determine the optimal sizing of photovoltaic(PV) generation and battery-based energy storage system(BESS) in such a nanogrid. The problem is formulated based on the mixed-integer linear programming(MILP)and then solved by a robust optimization approach. Flexible uncertainty sets are employed to adjust the conservativeness of the robust optimization, and Monte Carlo simulations are carried out to compare the performance of the solutions. Case studies demonstrate the merits of the proposed applications and verify the approach.

关键词： Nanogrid Battery swapping station Electric vehicle Renewable energy

Cyber-secure decentralized energy management for IoT-enabled active distribution networks

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Journal of Modern Power Systems and Clean Energy 2018年第5期6卷 900-917页

作者： Zhiyi LI mohammad shahidehpour Xuan LIU Robert W. Galvin Center for Electricity Innovation Illinois Institute of Technology College of Electrical and Information Engineering Hunan University

This paper provides a strategic solution for enhancing the cybersecurity of power distribution system operations when information and operation technologies converge in active distribution network(ADN). The paper first investigates the significance of Internet of Things(IoT) in enabling fine-grained observability and controllability of ADN in networked microgrids. Given severe cybersecurity vulnerabilities embedded in conventionally centralized energy management schemes, the paper then proposes a cyber-secure decentralized energy management framework that applies a distributed decision-making intelligence to networked microgrids while securing their individual mandates for optimal operation. In particular,the proposed framework takes advantage of software-defined networking technologies that can secure communications among IoT devices in individual microgrids, and exploits potentials for introducing blockchain technologies that can preserve the integrity of communications among networked microgrids in ADN. Furthermore, the paperpresents the details of application scenarios where the proposed framework is employed to secure peer-to-peer transactive energy management based on a set of interoperable blockchains. It is finally concluded that the proposed framework can play a significant role in enhancing the efficiency, reliability, resilience, and sustainability of electricity services in ADN.

关键词： Cybersecurity Active distribution network Blockchain Decentralized decision-making Internet of Things Networked microgrids Transactive energy

Peer-to-Peer Trading in Distribution Systems with the Utility's Operation

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 629-638页

作者： Xuanyi Xiao Feng Wang mohammad shahidehpour Yujia Zhai Quan Zhou Department of Electrical and Information Engineering Hunan UniversityChangshaChina Robert W.Galvin Center for Electricity Innovation Ilinois Institute of TechnologyChicagoIL60616USA

To realize a liberalized peer-to-peer (P2P) electricity market in distribution systems with network security, this paper develops a general framework for P2P trading in distribution systems with the utility's operation. The model is formulated as a bi-level programming. The utility's operation is an upper level problem, where a calculation method of network usage charges for P2P trading is also proposed. Peers' P2P trading is a lower level problem. An iterative algorithm based on analytical target cascading (ATC) is proposed to solve the model, where the interactions between utility and peers are presented. Numerical results on the IEEE 33-bus system demonstrate that the proposed method realizes a liberalized P2P market and ensures network security in distribution systems.

关键词： Distribution system peer-to-peer trading electricitymarket distributed energyresources(DERs) analytical target cascading(ATC)

Architecture,Control,and Implementation of Networked Microgrids for Future Distribution Systems

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Journal of Modern Power Systems and Clean Energy 2022年第2期10卷 286-299页

作者： Lei Yan Mehrdad Sheikholeslami Wenlong Gong mohammad shahidehpour Zuyi Li the Illinois Institute of Technology ChicagoIL 60616USA

Microgrid(MG)is a small-scale,self-sufficient power system that accommodates various distributed energy resources(DERs),controllable loads,and future distribution *** microgrids(NMGs)are clusters of MGs,which are physically interconnected and functionally coordinated to enhance distribution systems in terms of economics,resilience,and *** paper introduces the architecture and control of NMGs including nanogrid(NG)and *** accommodate variable DERs in NMGs,master and distributed control strategies are adopted to manage the high penetration of DERs,where master control focuses on economic operation,while distributed control focuses on reliability and resilience through active power sharing and voltage and frequency *** initial practices of NG,MG,and NMG in the networked Illinois Institute of Technology(IIT)campus microgrid(ICM)and Bronzeville community microgrid(BCM)in the *** *** applications of the master and distributed control strategies are illustrated for the networked ICM-BCM to show their benefits to economics,resilience,and reliability.

关键词： Networked microgrid economics resilience reliability master control distributed control real-time simulation.

Robust coordination of interdependent electricity and natural gas systems in day-ahead scheduling for facilitating volatile renewable generations via power-to-gas technology

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Journal of Modern Power Systems and Clean Energy 2017年第3期5卷 375-388页

作者： Chuan HE Tianqi LIU Lei WU mohammad shahidehpour School of Electrical Engineering and Information Sichuan UniversityChengdu 610065China Electrical and Computer Engineering Department Clarkson UniversityPotsdamNY 13699USA Electrical and Computer Engineering Department Illinois Institute of TechnologyChicagoIL 60616USA

The increasing interdependency of electricity and natural gas systems promotes coordination of the two systems for ensuring operational security and *** paper proposes a robust day-ahead scheduling model for the optimal coordinated operation of integrated energy systems while considering key uncertainties of the power system and natural gas system operation cost. Energy hub,with collocated gas-fired units, power-to-gas(Pt G) facilities, and natural gas storages, is considered to store or convert one type of energy(i.e., electricity or natural gas)into the other form, which could analogously function as large-scale electrical energy storages. The column-andconstraint generation(C&CG) is adopted to solve the proposed integrated robust model, in which nonlinear natural gas network constraints are reformulated via a set of linear constraints. Numerical experiments signify the effectiveness of the proposed model for handling volatile electrical loads and renewable generations via the coordinated scheduling of electricity and natural gas systems.

关键词： Robust day-ahead scheduling Electricity and natural gas coordination Renewable energy Power-to-gas Column-and-constraint generation

Integration of power-to-hydrogen in day-ahead security-constrained unit commitment with high wind penetration

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Journal of Modern Power Systems and Clean Energy 2017年第3期5卷 337-349页

作者： Mingfei BAN Jilai YU mohammad shahidehpour Yiyun YAO School of Electrical Engineering and Automation Harbin Institute of TechnologyHarbin 150001China Robert W.Galvin Center for Electricity Innovation Illinois Institute of TechnologyChicagoILUSA

The increasing integration of variable wind generation has aggravated the imbalance between electricity supply and demand. Power-to-hydrogen(P2H) is a promising solution to balance supply and demand in a variable power grid, in which excess wind power is converted into hydrogen via electrolysis and stored for later use. In this study, an energy hub(EH) with both a P2H facility(electrolyzer) and a gas-to-power(G2P) facility(hydrogen gas turbine) is proposed to accommodate a high penetration of wind power. The EH is modeled and integrated into a security-constrained unit commitment(SCUC) problem, and this optimization problem is solved by a mixed-integer linear programming(MILP) method with the Benders decomposition technique. Case studies are presented to validate the proposed model and elaborate on the technological potential of integrating P2H into a power system with a high level of wind penetration(HWP).

关键词： Electricity and natural gas coordination Power-to-hydrogen(P2H) Wind generation Security-constrained unit commitment(SCUC) Energy hub(EH)

Chain Rule for Extracting Resilience Procurement Costs from Locational Marginal Prices

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CSEE Journal of Power and Energy Systems 2024年第3期10卷 1342-1355页

作者： Yifei Wang Tong Zhu Tiancong Chen mohammad shahidehpour Qingshan Xu College of Electrical Engineering Southeast UniversityNanjing 210096China Henan Mechanical&Electrical Vocational College Xinzheng 451191China Illinois Institute of Technology ChicagoIllinois 60616USA IEEE CSEE

Power system resilience procurement costs in N-k contingencies have gained more prominence as number of extreme events continues to increase.A chain rule is presented in this paper for extracting resilience procurement costs from a fully decomposed locational marginal price(LMP)***,power transfer distribution factor(PTDF)matrices with AC power flow(i.e.,AC-PTDF)are ***-PTDF and AC-LODF(line outage distribution factor)equations are derived for N-k contingencies and a fully decomposed LMP model is developed where generation and transmission security components are established for specific ***,resilience procurement costs can be measured at different buses for the proposed security *** of N-k contingencies on resilience procurement costs at specific buses can be determined as proposed security components will gain more insight for resilience procurement in power *** modified IEEE 6-bus and 118-bus systems are adopted to verify effectiveness of the proposed resilience procurement method.

关键词： Line outage distribution factors locational marginal price power system resilience power transfer distribution factor security components

Intelligent data attacks against power systems using incomplete network information: a review

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Journal of Modern Power Systems and Clean Energy 2018年第4期6卷 630-641页

作者： Yufei SONG Xuan LIU Zhiyi LI mohammad shahidehpour Zuyi LI College of Electrical and Information Engineering Hunan University Electrical and Computer Engineering Department Illinois Institute of Technology

With the integration of information technologies, power system operations are increasingly threatened by cyber-attacks. It has even been revealed that an attacker can inject false data into real-time measurements stealthily without knowing the full configuration(e.g., network topology) of a power system. In this paper, we present a comprehensive review on false data injection attacks which utilize barrier conditions, blind identification techniques and data driven approaches to overcome limitations of incomplete network information. We also point out future research topics for facilitating the detection and prevention of such false data attacks.

关键词： Cyber security False data injection attack Incomplete network information Power system state estimation