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Short-term nodal load forecasting method considering redundant information

IOP Conference Series: Materials Science and Engineering 2018年第1期366卷

作者： Si Yang Long Zhao Xueshan Han Yong Wang Wenbo Li Donglei Sun Junxiong Wang Economic & Technology Research Institute of State Grid Shandong Electric Power Company Jinan China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China State Grid Shandong Electric Power Research Institute Jinan China

The most existing short-term nodal load forecasting methods only focused on the application of separate historical data, ignoring the abundant redundant information in power system. In this paper a new nodal load forecasting method considered physical redundancy and measurement redundancy was proposed. Firstly, the effect of redundant information on short-term nodal load forecasting was analysed and the forecasting principle was given. Secondly, in order to form additional state variable measurement equations, two kinds of existing redundant information between state variable and measured values were analysed deeply. Then based on the forecasting principle and the analysis results, the forecasting model mainly imitated the form of state estimation was established and the specific forecasting process was given. Case studies demonstrated that compared with traditional support vector machine model, the proposed method could effectively decrease forecasting errors and improve forecasting results.

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Fast Optimal Dispatch of Renewable Energy Sources in Distribution Networks

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IOP Conference Series: Earth and Environmental Science 2018年第2期153卷

作者： Wenbo Li Keqiang Li Liang Wang Bo Chen Xin Li Guojun Teng State Grid Shandong Electric Power Research Institute China. Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University) Jinan China. Shandong Electric Power Company China.

With the increasing penetration of distributed renewable energy sources such as photovoltaic and wind power generators in distribution networks, overvoltage problems occurred as a result of the reversed power flow. The randomness and intermittence of power outputs of the renewable energy sources make the operations of distribution systems complex at the same time. This paper proposes a simplified optimal dispatch algorithm for fast renewable energy sources power control to overcome voltage problems and permit better performance for distribution systems. Case study demonstrates the accuracy and efficiency of the optimal dispatch method proposed.

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Energy Hub Dispatch Considering Heating Network Flexibility

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IOP Conference Series: Earth and Environmental Science 2018年第5期186卷

作者： Wenbo Li Chunlong Chen Linlin Ma Cheng Wu Guangfeng Zhao Lulu Li State Grid Shandong Electric Power Research Institute China. Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University) Jinan China. Shandong Electric Power Company China.

Under high-penetration wind power, multi-energy complementary cooperation has provided new ideas to cope with its uncertainties. The widely distributed heating network affords high heat flexibility, which reflects in the mismatch between energy production value (EPV) and energy consumption value (ECV). The concept of generalized energy storage system (GESS) is introduced in this paper. To describe the relationship and build thermoelectric energy hub (EB) model considering heating network flexibility, temperature is employed as characteristic quantity. The result shows that the proposed method can decouple the Combined Heat and power (CHP) unit's coupling constraints to some extent and cooperate in dealing with wind power uncertainty during the process of ensuring active power coordination.

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Interactions Between Gas Networks and Microgrids Through Microturbines

Interactions Between Gas Networks and Microgrids Through Mic...

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IEEE power and Energy Society General Meeting

作者： Xiandong Xu Kang Li Hongjie Jia Yuanjun Guo Energy Power and Intelligent Control Cluster Queen's University Belfast Key Laboratory of Smart Grid of Ministry of Education Tianjin University Shenzhen Institute of Advanced Technology Chinese Academy of Sciences

ISBN: (纸本)9781538622131;9781538622124

By supplying thermal and electric energies to host facilities, microgrids with combined heat and power can enhance the resilience of urban energy systems. However, the increasing use of gas-fired distributed generations is pushing gas distribution networks to their operating limits, which may cause significant adverse impacts on microgrids. This paper investigates the interactions between gas networks and microgrids from the viewpoint of integrated energy systems. Four operating modes of microgrids are discussed to describe their connections with external energy networks. A novel model for gas-fired distributed generations, particularly microturbines, is first proposed to capture the interactions between gas networks and microgrids. An integrated system model is then developed to characterize the behaviors of the interrelated gas network and microgrids under different scenarios. Numerical results demonstrate that the variation of microturbine outputs may cause a large pressure drop of the gas network, especially during the transient process of gas flow adjustments. The results also reveal that microgrids can alter the operations among themselves through the accessed gas network.

关键词： Microgrids Load modeling Pipelines Cogeneration power system dynamics Resilience

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A Demand Response Scheme for Wind Integrated power System Based on Mechanism Design Theory

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IOP Conference Series: Materials Science and Engineering 2018年第1期366卷

作者： Xueliang Li Donglei Sun Yumin Zhang Xueshan Han Mingqiang Wang Si Yang Wenbo Li Xin Wei Economic & Technology Research Institute of State Grid Shandong Electric Power Company Jinan China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan 250061 China State Grid Shandong Electric Power Research Institute Jinan China

The increasing integration of high penetration of wind power into power systems have created great challenges for stable operation of the power system. It is important to design a reasonable demand response scheme (DRS) to make decision the optimal load relief, specially, for the wind power suppliers (WPS) and their customers (WPSC). Therefore, this paper proposes a demand response scheme for wind integrated power system based on mechanism design theory. Firstly, we derive the outage cost function and incentive function modeled by the two variables: the customers' type parameter and the location value. Secondly, incorporate customers' type parameter and locational flexibility into the DRS, and based on game theory, a demand response scheme with incentive compatible constraint and participation constraint is designed to maximize the benefit both the wind power suppliers and their customers. The implication of demand response scheme is to design an incentive structure that encourages customers to sign up for the right scheme and reveal their true value of load reduction. Finally, the eight-bus system example can demonstrate the effectiveness of the proposed method.

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Reliability assessment of micro-grid based on Markov model

Reliability assessment of micro-grid based on Markov model

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2016 IEEE PES Asia Pacific power and Energy Engineering Conference, APPEEC 2016

作者： Liu, Xiaoxian Yong, Wang Changwei, Song Qu, Hanbing Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Jinan China State Grid Jinan Power Supply Company Jinan China

ISBN: (纸本)9781509054183

Micro-grid can absorb the distributed power effectively, reduce loss, and improve power supply reliability. In order to assess micro-grid reliability quantitatively, the random natures of distributed power output are analyzed firstly in this paper. Wind power and photovoltaic Markov model are set up. And the power smoothing of energy storage is considered. Then the corresponding reliability evaluation process was given. And lastly, this paper realizes the micro-grid running states analysis and reliability assessment based on the analytic method. In addition, the new reliability indexes for micro-grid are proposed in the paper. Finally, example proves the efficiency of the above model and method. The results show that distributed power Markov model has a timing sequence and makes the assessment can better reflect the practical operation of micro-grid. It's significant for improving the reliability and economy of micro-grid operation. © 2016 IEEE.

关键词： Wind power

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Hierarchical control of isolated power system with DFIG-based wind turbine and parallel-connected battery energy storage system

Hierarchical control of isolated power system with DFIG-base...

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2016 IEEE Information Technology, Networking, Electronic and Automation control Conference, ITNEC 2016

作者： Liqing, Liu Ping, Du Yuliang, Wan Zengqiang, Mi State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources Baoding China Power Dispatching Control Center State Grid East Inner Mongolia Electric Power Company Limited Hohhot China

ISBN: (纸本)9781467391924

In this paper a two-level hierarchical control scheme is proposed for the coordinated control of DFIG-based wind turbine(DFIG) and battery energy storage system(BESS) within an isolated power system. The primary level consists of the local controllers associated with DFIG and BESS. With the indirect air gap flux linkage orientation technology adopted and the pitch control strategy improved, DFIG can maintain the voltage and frequency of isolated power system and operate along the transfer trajectory set by the second level control. With the P/Q control technology adopted, BESS can output special level of active and reactive power. The second level, consisting of a coordinate controller, is designed to coordinately regulate the active power output of DFIG and BESS, which can optimize the transfer trajectory of DFIG operation point and prolong the service life of BESS. Finally, Matlab/Simulink software is applied to verify the effectiveness of the proposed control strategy for the isolated power system. © 2016 IEEE.

关键词： controllers

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Hierarchical control of Isolated power System with DFIG-based Wind Turbine and Parallel-connected Battery Energy Storage System

Hierarchical Control of Isolated Power System with DFIG-base...

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2016 IEEE Information Technology,Networking,Electronic and Automation control Conference(ITNEC 2016)

作者： Liu Liqing Du Ping Wan Yuliang Mi Zengqiang State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources Power Dispatching Control Center State Grid East Inner Mongolia Electric Power Company Limited

ISBN: (纸本)9781467391955

In this paper a two-level hierarchical control scheme is proposed for the coordinated control of DFIG-based wind turbine(DFIG) and battery energy storage system(BESS)within an isolated power *** primary level consists of the local controllers associated with DFIG and *** the indirect air gap flux linkage orientation technology adopted and the pitch control strategy improved,DFIG can maintain the voltage and frequency of isolated power system and operate along the transfer trajectory set by the second level *** the P/Q control technology adopted,BESS can output special level of active and reactive *** second level,consisting of a coordinate controller,is designed to coordinately regulate the active power output of DFIG and BESS,which can optimize the transfer trajectory of DFIG operation point and prolong the service life of ***,Matlab/Simulink software is applied to verify the effectiveness of the proposed control strategy for the isolated power system.

关键词： DFIG BESS Indirect stator flux orientation Optimization of the transfer trajectory

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Probabilistic Forecasting for the Ampacity of Overhead Transmission Lines Using Quantile Regression Method

Probabilistic Forecasting for the Ampacity of Overhead Trans...

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IEEE PES Asia-Pacific power and Energy Engineering Conference (APPEEC)

作者： Wei, Zhiqing Wang, Mengxia Han, Xueshan Zhang, Haicheng Zhang, Qiang Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan Shandong Peoples R China State Grid Shandong Elect Power Co Binzhou Power Supply Co Binzhou Shandong Peoples R China Shandong Elect Power Dispatching & Control Ctr Jinan Shandong Peoples R China

ISBN: (纸本)9781509054183

Dynamic thermal rating (DTR) is an effective technique to improve the ampacity of overhead power transmission lines based on the monitoring of real-time environmental conditions. With DTR technology being introduced, the thermal rating of transmission line is no longer constant but time-dependent. To fully utilize the transfer capability of transmission lines, it is necessary to provide operators with probabilistic forecasting information of DTR to make dispatch decision. In this paper, a new probabilistic forecast method based on the quantile regression analysis theory is proposed to realize the probabilistic prediction of DTR. The weather parameters which have significant influence on the real-time ampacity and historical line ratings are embedded in the quantile regression prediction model. The proposed method can not only give the point prediction and interval prediction result, but also can provide the forecasting results of probability distribution function. Finally, the validity of the proposed method is illustrated by case studies.

关键词： capacity forecast dynamic line rating overhead line probability distribution function quantile regression

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Security Constrained Economic Dispatch with Dynamic Thermal Rating Technology Integration

Security Constrained Economic Dispatch with Dynamic Thermal ...

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IEEE International Conference on power and Renewable Energy (ICPRE)

作者： Zhang, Haicheng Du, Mingtian Zhao, Quangang Xue, Li Wei, Zhiqing Zhang, Qiang State Grid Shandong Elect Power Co Binzhou Power Supply Co Binzhou Shandong Peoples R China Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan Shandong Peoples R China Shandong Elect Power Dispatching & Control Ctr Jinan Shandong Peoples R China

ISBN: (纸本)9781509030682

In traditional model for security constrained economic dispatch (SCED) decision, the limit on power transfer capability of overhead transmission line (OTL) is represented by its static thermal rating (STR) which incurs conservative constraints on OTLs' transfer limits which definitely causes conservative decision results. Comparing with STR, dynamic thermal rating (DTR) is an effective technique to improve the ampacity of OTL based on the monitoring of real-time environmental conditions including ambient temperature, solar radiation, wind speed and direction. Aiming to the issue mentioned above, in this paper, a SCED implementation framework is first designed with DTR technology integration, after that, on basis of the historical data gathered by DTR, a forecasting approach for thermal rating is proposed. Predict the environmental conditions along the overhead line using the exponential smoothing method first and then the forecasting of the DTR can be obtained. Then the benefits that delivered by utilizing the forecast thermal rating in SCED is analyzed via case studies. This paper explores an application pattern of DTR technology in SCED. It is capable of enhancing the power system security and economic performances by exploiting the potential transfer capability of OTLs.

关键词： power system overhead line dynamic thermal rating security constrained economic dispatch

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