检索结果-内蒙古大学图书馆

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...

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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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Design and Implementation of Energy-Saving control System of Fan Based on PLC

Design and Implementation of Energy-Saving Control System of...

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

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

For the purpose of improving the operation efficiency and automatic control ability of fan, exploring energy saving potential at large and realizing full use of energy, the energy-saving control system of fan based on PLC S7-200 is presented. According to the variation of performance curve and pipeline characteristic curve under different flow regulating methods, the principle of energy-saving through frequency conversion control is investigated. The output voltage and frequency of variable frequency power supply can be adjusted in time on the basis of air flow pressure change so that it can keep fans' power input fluctuating in the high efficiency area. The frequency conversion of the boiler draught fan in a power plant indicates its energy-saving effect. Through a concrete example, the evaluation of frequency conversion is analyzed. The result shows that the system possesses high power-factor, auto constant pressure, and good reliability, so it has strong practicability and engineering application value.

关键词： PLC fan variable frequency energy saving

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

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

ISBN: (纸本)9781509054190

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.

关键词： Reliability power system reliability Wind power generation Markov processes Photovoltaic systems Indexes

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Transformer inrush current restraining scheme based on closing voltage amplitude controlling method

Transformer inrush current restraining scheme based on closi...

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

作者： Weixu Wang Wei Cong Yaru Sheng Jing Xiao Jianmei Cao Qingshui Hao Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Jinan China Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Jinan Shandong CN State Grid Shandong Electric Power Corporation Maintenance Company Jinan China State Grid of China Technolgy Coll. Jinan China

ISBN: (纸本)9781509054190

A scheme of restraining transformer inrush current based on control by closing voltage amplitude is proposed based on analyzing the influence factors of transformer inrush current and deriving the mathematical relationship between inrush current and influence factors. In this scheme, in order to making sure that the magnetic flux produced by the transformer no-load closing does not exceed saturated magnetic flux, the voltage amplitude should be controlled by selecting the appropriate curve, thus attaining the goal restraining the transformer inrush current. The control function of voltage amplitude is derived from the magnetic flux inequality and the attenuation law of the transient flux component, and the upper and lower limitation of initial value and slope in the voltage amplitude control function is deduced.

关键词： Surges Magnetic analysis Companies Reliability Switches Magnetic circuits

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Research of the transformer energization control strategy applied for storage-based wind farm self-start

Research of the transformer energization control strategy ap...

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

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

ISBN: (纸本)9781467391955

The self-start ability is the precondition for storage-based wind farm to be the black-start power source in local power grid. To avoid the strike to battery energy storage system which caused by energization of transformers, the no-load transformer energization control strategy during self-start process of storage-based wind farm is researched in this paper. The optimal starting control strategy for BESS is proposed by analyzing generation mechanism of magnetizing inrush current. Then equivalent model is established according to actual wind farm, simulation of proposed three different energization strategies has been made. Finally by comparison of simulation results, the energization control strategy applied for storagebased wind farm self-start is proposed.

关键词： wind farm self-start battery energy storage system energization of transformer magnetizing inrush current vsc control

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Mutual impedance parameter modeling and accurate location algorithm of angled space crossed transmission lines

Mutual impedance parameter modeling and accurate location al...

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China International Conference on Electricity Distribution, CICED

作者： Ying Zhang Jun Liang Peng Wang Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Jinan China State Grid Dezhou Electric Power Supply Company Dezhou China

ISBN: (纸本)9781467390712

On the account of more and more inevitable scene of angled space crossed transmission line in real project, classical distribution parameter model is no longer applicable, and coupling effect between two lines needs to be reconsidered. This paper popularizes mutual impedance from limited conductor to angled space crossed lines, and analyses the characteristic of mutual impedance coefficient along the line. Based on the segmented nominal-π line model, in which mutual impedance of each section is obtained by Neuman's Integral, the location equation is derived by utilizing the feature that the voltages calculated from two sides are equal at the fault point. Simulations in PSCAD compare the differences of fault-location results between in the condition of considering and ignoring coupling effect of space crossed transmission lines. The calculation results demonstrate that the proposed algorithm has higher accuracy, and is not affected by fault types.

关键词： Impedance Conductors power transmission lines Circuit faults Couplings Wires Mathematical model

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The Delicate Analysis of Short–Term Load Forecasting

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IOP Conference Series: Materials Science and Engineering 2017年第1期199卷

作者： Changwei Song Yuan Zheng Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China State Grid Jiangxi Electric Power Company Jiujiang Electric Power Supply Company China

This paper proposes a new method for short-term load forecasting based on the similar day method, correlation coefficient and Fast Fourier Transform (FFT) to achieve the precision analysis of load variation from three aspects (typical day, correlation coefficient, spectral analysis) and three dimensions (time dimension, industry dimensions, the main factors influencing the load characteristic such as national policies, regional economic, holidays, electricity and so on). First, the branch algorithm one-class-SVM is adopted to selection the typical day. Second, correlation coefficient method is used to obtain the direction and strength of the linear relationship between two random variables, which can reflect the influence caused by the customer macro policy and the scale of production to the electricity price. Third, Fourier transform residual error correction model is proposed to reflect the nature of load extracting from the residual error. Finally, simulation result indicates the validity and engineering practicability of the proposed method.

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Hybrid wind-PV system capacity limit calculation of based on constraint transformer

Hybrid wind-PV system capacity limit calculation of based on...

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China International Conference on Electricity Distribution, CICED

作者： Yifei Guo Houlei Gao Zhigang Wu Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China State Grid Shandong Electrical Power Company Jinan China

ISBN: (纸本)9781467390712

Aiming at the hybrid wind-PV system planning problem, a optimization model of installed capacity is proposed in this paper with the constraint of main transformer. Firstly, to account for the stochastic nature of wind and solar resource, by use of ARMA model and Fuzzy C-means(FCM) algorithm, a full-year time series models of wind power, photovoltaic(PV) power are presented. Then, using main transformer utilization, the complementarity of wind and solar energy resource is quantified. And based on the chance-constrained programming, the calculation models are respectively built for two common kinds of planning problem. With an actual case in Shandong province, the problems of wind and solar accommodation and the optimal proportion are calculated and analyzed. The results demonstrate the effectiveness of the proposed method in improving the renewable energy resource utilization.

关键词： Wind speed Planning Wind power generation Solar radiation Wind farms Load modeling

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Optimal reserve model with risk and emergency power control constraint

Optimal reserve model with risk and emergency power control ...

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

作者： Jibo Sun Yanwei Wang Yinguo Yang Yu Kou Jiangfeng Jiang Fan Liu Tao Ding Zhaohong Bie Yanlin Wu Electric Power Dispatching Control Center Guangdong Power Grid Co. Ltd Guangzhou China State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an China State Grid Shaanxi Economic Research Institute Xi'an China

ISBN: (纸本)9781509054190

In this paper, a new reserve model based on risk of the power system is proposed to considering both the reliability and the economy. In the meantime, the emergency DC power control are considered in this model. In the reserve model, the operating reserve are classified into load reserve and contingency reserve. The objective is to minimize the energy and reserve cost. Apart from system wide reserve requirements in the previous optimization model, constraints include emergency DC power support and contingency reserve requirements reflecting by risk. This model taking the reliability and the economy into account is insightful to guide the future development of reserve schedule for power system.

关键词： Generators power system stability Accidents power control Load modeling power system reliability

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