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Prediction of line failure fault based on weighted fuzzy dynamic clustering and improved relational analysis

IOP Conference Series: Earth and Environmental Science 2018年第1期133卷

作者： Xiaocheng Meng Renfei Che Shi Gao Juntao He Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan 250061 CHN School of Electrical Engineering Shandong University Jinan 250061 CHN State Grid Hebei Maintenance Branch Shijiazhuang 050070 CHN

With the advent of large data age, power system research has entered a new stage. At present, the main application of large data in the power system is the early warning analysis of the power equipment, that is, by collecting the relevant historical fault data information, the system security is improved by predicting the early warning and failure rate of different kinds of equipment under certain relational factors. In this paper, a method of line failure rate warning is proposed. Firstly, fuzzy dynamic clustering is carried out based on the collected historical information. Considering the imbalance between the attributes, the coefficient of variation is given to the corresponding weights. And then use the weighted fuzzy clustering to deal with the data more effectively. Then, by analyzing the basic idea and basic properties of the relational analysis model theory, the gray relational model is improved by combining the slope and the Deng model. And the incremental composition and composition of the two sequences are also considered to the gray relational model to obtain the gray relational degree between the various samples. The failure rate is predicted according to the principle of weighting. Finally, the concrete process is expounded by an example, and the validity and superiority of the proposed method are verified.

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Analysis of influencing factors in hybrid state estimation

Analysis of influencing factors in hybrid state estimation

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

作者： Xueliang, Yu Hengxu, Zhang Cao, Jianmei Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China State Grid of China Technology College Jinan China

ISBN: (纸本)9781509054183

Hybrid state estimation has become a significant tool to utilize PMU measurements in modern power dispatch center. Factors affecting estimation accuracy are discussed in this paper, including measurement number, PMU number and measurement uncertainty. And it also explores the extent of impacts with simulation results. PMU current phasors are transformed into pseudo power injections and their uncertainties are calculated by uncertainty propagation theory. PMU numbers and their optimal deployment are determined by integer quadratic programming approach. Monte Carlo simulations are carried out in IEEE 14-bus system in this paper. © 2016 IEEE.

关键词： Quadratic programming

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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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2016 IEEE International Conference on power and Renewable Energy （ICPRE 2016）

作者： Haicheng Zhang Mingtian Du Quangang Zhao Li Xue Zhiqing Wei Qiang Zhang Binzhou Power Supply Company of State Grid Shandong Electric Power Company Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University) Shandong Electric Power Dispatching and Control Center

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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Transient Risk Assessment for power System with Wind Farms Integration Based on DSR

Transient Risk Assessment for Power System with Wind Farms I...

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IEEE power and Energy Society General Meeting

作者： Yuan Zeng Baozhu Zhou Chao Qin Yinsheng Su Peng Li Key Laboratory of Smart Grid of Ministry of Education Tianjin University China Electric Power Dispatching Control Center China Southern Power Grid Guangzhou China

ISBN: (纸本)9781509041695

Integration of wind power generation is increasing rapidly worldwide, hence bringing more challenges to the safe operation of the power system. In this paper, the basic construction method of dynamic security region (DSR) boundary is introduced. A model is established based on DSR, whose object is the minimization of controlling cost in dispatching operations. The coordinated control strategy based on DSR is proposed, with which transient risk assessment of the power system connecting wind farms is studied. The risk indexes calculation and comprehensive analysis method of wind power integration system are defined based on DSR, which can give quantitative indicators to the system day-ahead scheduling plan and present the risk sources as well as weak buses information. Test results on the New England 10-genrator 39-bus system are presented and prove the effectiveness of this approach.

关键词： Wind farms power system stability Transient analysis Risk management Wind power generation Generators

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Chance-Constrained Programming Model for Reference Network With Wind power Integration

Chance-Constrained Programming Model for Reference Network W...

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IEEE Conference on Energy Internet and Energy System Integration

作者： Donglei Sun Jinhong Yang Xueshan Han Junxiong Wang Xin Tian Bin Yang Lina Zhang Nan Wang Economic & Technology Research Institute of State Grid Shandong Electric Power Company State Grid Shandong Electric Power Maintenance Company Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University)

ISBN: (纸本)9781538614280

With the large-scale integration of volatile wind power generations, power system operation and planning face the problem of increasing injection fluctuations and uncertainties. In this paper, chance constraint expressions are used to characterize the wind power uncertainty, and then a new chance-constrained programming model for reference network with wind power integration is proposed to ensure the expected wind power utilization. In the proposed model, the objective function is minimizing total power generation cost and transmission investment cost, and the constraints are the safety operation technical requirements under intact operation state and the preconceived contingency operation state. The sample average approximation (SAA) method is used to develop a deterministic approach for the proposed model. Numerical analysis shows the potential benefit of the proposed model.

关键词： Reference network Wind power integration power grid evaluation Chance constraints Sample-average approximation (SAA)

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Unit Commitment Considering Demand Response Behavior Based on Utility Maximization

Unit Commitment Considering Demand Response Behavior Based o...

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IEEE Conference on Energy Internet and Energy System Integration

作者： Yumin Zhang Xueshan Han Bo Xu Li Zhang Donglei Sun Xiaofeng Miao Jiayin Jiang Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment (Department of Electrical Engineering Tsinghua University) Economic & Technology Research Institute of State Grid Shandong Electric Power Company State Grid Shandong Electric Power Company Yantai Electric Power Company

ISBN: (纸本)9781538614280

The active participation of demand side resources in power grid operation not only benefits the individual participant but also benefits the whole system. The optimal goal can promote by excavating the active behaviors of demand side. The welfare maximization of market participant is the driving force of such active behaviors. Considering the independence of each user's behavior, the consumer's utility function is selected to depict consumer's preference and demand response behavior. In order to coordinate the consumers' maximum welfare with social welfare maximization, consumers' utility function and units' operation cost are integrated into Unit Commitment (UC) model. The objective function is to maximize social welfare, by subtracting units' operation cost from consumers' total utility, and this objective can be acquired. Considering the proposed model should be solved in a distributed manner, the idea of the centralized coordination and the decentralized decision-making is proposed. Based on the Lagrangian relaxation (LR) principle and distributed real-time pricing scheme, a closed-loop feedback mechanism is constructed to reflect the relationship among generator output, price level, and load demand. The ten generating units example can illustrate the effectiveness of the proposed method.

关键词： Demand utility Decomposition coordination Electricity market Lagrangian relaxation Real-time pricing Unit commitment

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An analytic method of calculating rotor and stator short-circuit current of DFIG with RSC control

An analytic method of calculating rotor and stator short-cir...

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

作者： Jinhua Zhang Baohui Zhang Bingqing Wu Jin Wang Shaanxi Key Laboratory of Smart Grid Xi'an Jiaotong University Xi'an China Electric Power Dispatching and Control Center State Grid Shandong Electric Power Company Jinan China

ISBN: (纸本)9781509054190

To investigate the fault features of doubly-fed induction generator (DFIG) with rotor side converter (RSC) control, an analytic method of calculating the DFIG short-circuit current is proposed in this paper. Based on the space vector model of DFIG with RSC control, the dynamic equation of rotor current reflecting both the machine transient process and the impact of RSC control is derived, and analytic expressions of rotor and stator fault current in time-domain are obtained. The calculation result is certified by being compared with the PSCAD simulation result. According to the derived analytic expressions, the components of the DFIG short-circuit current are analyzed. It indicates that the machine terminal voltage dip of DFIG, the current reference value, the orientation angle, and the proportional-integral value of RSC controller are main factors influencing the short-circuit current characteristics.

关键词： Damping Indexes power grids Frequency control Time-frequency analysis Stators

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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： Zhiqing Wei Mengxia Wang Xueshan Han Haicheng Zhang Qiang Zhang Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University) Shandong Jinan China Binzhou Power Supply Company of State Grid Shandong Electric Power Company Shandong Binzhou China Shandong Electric Power Dispatching and Control Center Shandong Jinan China

ISBN: (纸本)9781509054190

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： Forecasting Conductors Wind forecasting Probabilistic logic power transmission lines Probability distribution

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Output Tracking of Boiler-Turbine System by Fuzzy Guaranteed Cost control

Output Tracking of Boiler-Turbine System by Fuzzy Guaranteed...

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第35届中国控制会议

作者： Bo Pang Yadong Zhao Bowen Yi Liyue Chen Weidong Zhang Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education Electric power dispatching control center State Grid Zhejiang Electric Power Company

ISBN: (纸本)9781509009107

This paper proposes a controller design strategy of output tracking by guaranteed cost control(GCC) for TakagiSugeno(T-S) fuzzy systems and applies it to a boiler-turbine ***,based on the original T-S fuzzy system,an augmented system with integral action is established to eliminate steady tracking ***,a state-feedback parallel distributed compensation(PDC) controller is designed such that the guaranteed cost function has an upper *** condition that guarantees quadratical stability of the resulting closed-loop system is derived by using a relaxed stability condition of T-S fuzzy *** obtain as good performance as possible,the design procedure is transformed into a linear matrix inequalities(LMIs) optimization problem and the upper bound of the guaranteed cost function is ***,the simulation of output tracking control of a boiler-turbine system verifies the effectiveness and feasibility of the proposed approach.

关键词： Guaranteed cost control(GCC) Takagi-Sugeno(T-S) fuzzy system Linear matrix inequalities(LMIs) Boilerturbine unit

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Design and Implementation of PLC Based Reclosing Device on Synchronization Line of Small Hydropower Stations

Design and Implementation of PLC Based Reclosing Device on S...

引用

2016 IEEE International Conference on power and Renewable Energy （ICPRE 2016）

作者： Yang Genghuang Wang Jiguang Su Xin Sun Wenbin Tianjin Key Laboratory of Information Sensing and Intelligent Control Tianjin University of Technology and Education Chengxi Power Supply Bureau Tianjin POWER GRID

The traditional auto-reclosing method in relaying cannot meet the requirements of the distribution network with small hydropower in case of faults. In order to provide reliable guarantee for safe operation of transmission line, on the basis of the improvement measures by the reclosing device in the practical engineering, a reclosing device adapted to synchronization line of small hydropower station is designed and implemented in this paper. SIEMENS PLC-1200 is used and the human-computer interface is realized by WinCC monitoring configuration software. Field application result indicates that the device improves the success rate of reclosing and promotes reliability and stability of power supply in small-hydroelectric area.

关键词： PLC small hydropowe eclosing device WinCC

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