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Controlled islanding schemes for interconnected power systems based on coherent generator group identification and wide-area measurements

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Journal of Modern Power Systems and Clean Energy 2016年第3期4卷 440-453页

作者： Zhenzhi LIN fushuan wen Junhua ZHAO Yusheng XUE School of Electrical Engineering Zhejiang UniversityHangzhou 310027China Department of Electrical&Electronic Engineering Universiti Teknologi BruneiBandar Seri Begawan 1410Brunei School of Science and Engineering Chinese University of Hong Kong(Shenzhen)Shenzhen 518172China State Grid Electric Power Research Institute Nanjing 211106China

A reasonable islanding strategy of a power system is the final resort for preventing a cascading failure and/or a large-area blackout from occurrence. In recent years, the applications of wide area measurement systems(WAMS) in emergency control of power systems are increasing. Therefore, a new WAMS-based controlled islanding scheme for interconnected power systems is proposed. First, four similarity indexes associated with the trajectories of generators are defined, and the weights of these four indexes are determined by using the well-developed entropy theory. Then, a coherency identification algorithm based on hierarchical clustering is presented to determine the coherent groups of ***, an optimization model for determining controlled islanding schemes based on the coherent groups of generators is developed to seek the optimal cutset. Finally, a 16-generator68-bus power system and a reduced WECC 29-unit 179-bus power system are employed to demonstrate the proposed WAMS-based controlled islanding schemes, and comparisons with existing slow coherency based controlled islanding strategies are also carried out.

关键词： Wide area measurement system Coherent generators Controlled islanding Trajectory clustering algorithm Entropy weight

Risk-based security-constrained economic dispatch in power systems

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Journal of Modern Power Systems and Clean Energy 2013年第2期1卷 142-149页

作者： Qin WANG Aimin YANG fushuan wen Jihong LI Iowa State University AmesIA 50011-2151USA A.YANGSouth China University of TechnologyGuangzhou 510640China Zhejiang University Hangzhou 310027China Zhejiang Electric Power Corporation Hangzhou 310007China

Based on a new perspective in coordinating with the traditional"N-1"criteria and system risk,a real-time electricity market model is presented,in which the system risk is employed to model the system’s overall security *** new model is called the risk-based security-constrained economic dispatch(RB-SCED).Relative to the securityconstrained economic dispatch(SCED)used in the power industry today,the RB-SCED finds more secure and economic operating *** does this by obtaining solutions that achieve a better balance between post-contingency flows on individual branches and the overall system *** method exploits the fact that,in a SCED solution,some postcontingency branch flows which exceed their limits impose little risk while other post-contingency branch flows which are within their limits impose significant *** RB-SCED softens constraints for the former and hardens constraints for the latter,thus achieving simultaneous improvement in both security and *** this work,the basic concept and the mathematical formulation of the RB-SCED model are systematically *** results on a 9-bus system and the ISO New England actual system have demonstrated the advantages of RB-SCED over SCED.

关键词： Economic dispatch Security-constrained economic dispatch(SCED) Risk-based securityconstrained economic dispatch(RB-SCED) Contingency Power system

Electromechanical wave in power systems:theory and applications

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Journal of Modern Power Systems and Clean Energy 2014年第2期2卷 163-172页

作者： Yan XU fushuan wen Gerard LEDWICH Yusheng XUE School of Electrical Engineering Zhejiang UniversityHangzhou 310027China Queensland University of Technology Gardens PointBrisbaneQLDAustralia State Grid Electric Power Research Institute Nanjing 210003China

The continuum model is a key paradigm describing the behavior of electromechanical transients in power *** the past two decades,much research work has been done on applying the continuum model to analyze the electromechanical wave in power *** this work,the uniform and non-uniform continuum models are first briefly described,and some explanations borrowing concepts and tools from other fields are ***,the existing approaches of investigating the resulting wave equations are *** application named the zero reflection controller based on the idea of the wave equations is next presented.

关键词： Power system Electromechanical wave propagation Continuum model Zero reflection controller

Small signal stability analysis of power systems with high penetration of wind power

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Journal of Modern Power Systems and Clean Energy 2013年第3期1卷 241-248页

作者： Ping HE fushuan wen Gerard LEDWICH Yusheng XUE South China University of Technology Guangzhou 510640China Zhengzhou University of Light Industry Zhengzhou 450002China Queensland University of Technology Gardens PointBrisbaneAustralia State Grid Electric Power Research Institute Nanjing 210003China

The integration of large amount of wind power into a power system imposes a new challenge for the secure and economic operation of the *** is necessary to investigate the impacts of wind power generation on the dynamic behavior of the power system *** paper investigates the impacts of large amount of wind power on small signal stability and the corresponding control strategies to mitigate the negative *** concepts of different types of wind turbine generators(WTGs)and the principles of the grid-connected structures of wind power generation systems are first briefly ***,the state-of-the-art of the studies on the impacts of WTGs on small signal stability as well as potential problems to be studied are ***,the control strategies on WTGs to enhance power system damping characteristics are presented.

关键词： Wind turbine generators Wind farm integration Small signal stability Damping characteristic

Technologies and Practical Implementations of Air-conditioner Based Demand Response

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Journal of Modern Power Systems and Clean Energy 2021年第6期9卷 1395-1413页

作者： Muhammad Waseem Zhenzhi Lin Yi Ding fushuan wen Shengyuan Liu Ivo Palu School of Electrical Engineering Zhejiang University Department of Electrical Power Engineering and Mechatronics Tallinn University of Technology

Nowadays,the most notable uncertainty for an electricity utility lies in the electrical demand of *** response(DR)has acquired considerable attention due to uncertain generation outputs from intermittent renewable energy sources and advancements of smart grid *** percentage of the air-conditioner(AC)load over the total load demand in a building is usually very ***,controlling the power demand of ACs is one of significant measures for implementing *** this paper,the increasing development of ACs,and their impacts on power demand are firstly introduced,with an overview of possible DR ***,a comprehensive review and discussion on control techniques and DR programs for ACs to manage electricity utilization in residential and commercial energy sectors are carried ***,comparative analysis among various programs and projects utilized in different countries for optimizing electricity consumption by ACs is ***,the conclusions along with future recommendations and challenges for optimal employment of ACs are presented in the perspective of power systems.

关键词： Air-conditioner(AC) commercial load cooling demand demand response(DR) energy consumption residential load

Interharmonic Analysis Model of Photovoltaic Grid-connected System with Extended Dynamic Phasors

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Journal of Modern Power Systems and Clean Energy 2021年第6期9卷 1540-1547页

作者： Qing Zhong Yangxin Qiu Yuming Zhao Haifeng Li Gang Wang fushuan wen School of Electric Power South China University of Technology Shenzhen Power Supply Bureau Co. Ltd. School of Electrical Engineering Zhejiang University

The interactions between randomly fluctuating power outputs from photovoltaic(PV) at the DC side and background voltage distortions at the AC side could generate interharmonics in the PV grid-connected system(PVGS). There is no universal method that can reveal the transmission mechanism of interharmonics and realize accurate calculation in different scenarios where interharmonics exist in the PVGS. Therefore, extended dynamic phasors(EDPs) and EDP sequence components(EDPSCs) are employed in the interharmonic analysis of the PVGS. First, the dynamic phasors(DPs) and dynamic phasor sequence components(DPSCs) are extended into EDPs and EDPSCs by selecting a suitable fundamental frequency other than the power frequency. Second, an interharmonic analysis model of the PVGS is formulated as a set of state space equations. Third, with the decoupling characteristics of EDPSCs,generation principles and interactions among the interharmonics in the PVGS are presented by the sequence components,and its correctness is verified by simulation and *** presented model can be used to accurately calculate the interharmonics generated in the PVGS both at the AC and DC sides. Because of the decoupling among the EDPSCs, the set of state space equations can effectively describe the principle.

关键词： Dynamic phasor sequence component(DPSC) harmonic interharmonic photovoltaic grid-connected system(PVGS) power quality

Scenario-based Optimal Real-time Charging Strategy of Electric Vehicles with Bayesian Long Short-term Memory Networks

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Journal of Modern Power Systems and Clean Energy 2024年第5期12卷 1572-1583页

作者： Hongtao Ren Chung-Li Tseng fushuan wen Chongyu Wang Guoyan Chen Xiao Li the College of Electrical Engineering Zhejiang UniversityHangzhou 310027China UNSW Business School The University of New South WalesNSW 2052SydneyAustralia Hainan Institute Zhejiang UniversitySanya 572000China the Department of Electrical Engineering College of Infor‐mation Science and EngineeringHuaqiao UniversityXiamenChina Guangzhou Power Supply Bureau of Guangdong Power Grid Co. Ltd.GuangzhouChina

Joint operation optimization for electric vehicles(EVs)and on-site or adjacent photovoltaic generation(PVG)are pivotal to maintaining the security and economics of the operation of the power system *** offline optimization algorithms lack real-time applicability due to uncertainties involved in the charging service of an EV charging station(EVCS).Firstly,an optimization model for real-time EV charging strategy is proposed to address these challenges,which accounts for environmental uncertainties of an EVCS,encompassing EV arrivals,charging demands,PVG outputs,and the electricity ***,a scenario-based two-stage optimization approach is *** scenarios of the underlying uncertain environmental factors are generated by the Bayesian long short-term memory(B-LSTM)***,numerical results substantiate the efficacy of the proposed optimization approach,and demonstrate superior profitability compared with prevalent approaches.

关键词： Bayesian neural network charging strategy electric vehicle(EV) long short-term memory(LSTM) scenario analysis

Data-driven Two-step Day-ahead Electricity Price Forecasting Considering Price Spikes

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Journal of Modern Power Systems and Clean Energy 2023年第2期11卷 523-533页

作者： Shengyuan Liu Yicheng Jiang Zhenzhi Lin fushuan wen Yi Ding Li Yang School of Electrical Engineering Zhejiang UniversityHangzhou 310027China School of Electrical Engineering Shandong UniversityJinan 250061China State Grid Zhejiang Electric Power Corporation Hangzhou 310007ChinaHangzhou 310027China

In the electricity market environment,electricity price forecasting plays an essential role in the decision-making process of a power generation company,especially in developing the optimal bidding strategy for maximizing ***,it is necessary for a power generation company to develop an accurate electricity price forecasting *** this background,this paper proposes a two-step day-ahead electricity price forecasting algorithm based on the weighted Knearest neighborhood(WKNN)method and the Gaussian process regression(GPR)*** the first step,several predictors,i.e.,operation indicators,are presented and the WKNN method is employed to detect the day-ahead price spike based on these *** the second step,the outputs of the first step are regarded as a new predictor,and it is utilized together with the operation indicators to accurately forecast the electricity price based on the GPR *** proposed algorithm is verified by actual market data in Pennsylvania-New JerseyMaryland Interconnection(PJM),and comparisons between this algorithm and existing ones are also made to demonstrate the effectiveness of the proposed *** results show that the proposed algorithm can attain accurate price forecasting results even with several price spikes in historical electricity price data.

关键词： Electricity market electricity price forecasting price spike weighted K-nearest neighborhood(WKNN) Gaussian process regression(GPR).

Optimal Pricing Strategy for Data Center Considering Demand Response and Renewable Energy Source Accommodation

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Journal of Modern Power Systems and Clean Energy 2023年第1期11卷 345-354页

作者： Chenwei Jiang Chung-Li Tseng Yizheng Wang Zhou Lan fushuan wen Fei Chen Liang Liang School of Electrical Engineering Zhejiang UniversityHangzhou 310027China Economic and Technology Research Institute State Grid Zhejiang Electric Power Co.Ltd.Hangzhou 310000China UNSW Business School The University of New South WalesSydneyAustralia Department of Electrical Power Engineering and Mechatronics Tallinn University of TechnologyEstonia Jiaxing Power Supply Company State Grid Zhejiang Electric Power Co.Ltd.Jiaxing 314000China IEEE

With the continuous development of information technology,data centers(DCs)consume significant and evergrowing amounts of electrical *** energy sources(RESs)can act as clean solutions to meet this requirement without polluting the *** DC serves numerous users for their data service demands,which are regarded as flexible *** this paper,the willingness to pay and time sensitivities of DC users are firstly explored,and the user-side demand response is then devised to improve the overall benefits of DC ***,a Stackelberg game between a DC and its users is *** upper-level model aims to maximize the profit of the DC,in which the time-varying pricing of data services is optimized,and the lower-level model addresses user’s optimal decisions for using data services while balancing their time and cost *** original bi-level optimization problem is then transformed into a single-level problem using the Karush-Kuhn-Tucker optimality conditions and strong duality theory,which enables the problem to be solved ***,case studies are conducted to demonstrate the feasibility and effectiveness of the proposed method,as well as the effects of the time-varying data service price mechanism on the RES accommodation.

关键词： Data center(DC) demand response(DR) pricing strategy renewable energy source(RES) Stackelberg game