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第35届中国控制会议

作者： Shengwei Mei Tianwen Zheng Laijun Chen Chun Lai Li Yang Si Yan Guo Qinghai Key Lab of Efficient Utilization of Clean Energy (New Energy Photovoltaic Industry Research Center Qinghai University) State Key Lab of Control and Simulation of Power Systems and Generation Equipment (Dept.of Electrical EngineeringTsinghua University) Qinghai Electrical Power Research Institute Qinghai Electric Power Corporation

ISBN: (纸本)9781509009107

This paper presents the concept and control strategy of PV-VSG,which integrates photovoltaic(PV) and virtual synchronous generator(VSG) together without battery energy storage system(BESS).First,the PV-VSG topology and the operation stability regions are clearly analyzed to ensure PV-VSG operate in the secure ***,to control multiple PV-VSGs operating well in grid-connected mode,a novel distributed control strategy based on consensus algorithm is *** consensus-based distributed control strategy can not only makes a group of PV-VSGs converge and operate at the preset ratio of available power,but also regulates the total active power flow on the public connection point(PCC) to keep the same as the referenced *** correctness and effectiveness of the proposed control strategy are verified with the provided simulation results.

关键词： Grid-friendly photovoltaic virtual synchronous generator consensus-based distributed control power dispatch

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Stability analysis of wide-area damping control system with stochastic communication time delay

Stability analysis of wide-area damping control system with ...

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Innovative Smart Grid Technologies (ISGT)

作者： Xinran Zhang Chao Lu Yingduo Han State Key Laboratory of Control and Simulation of Power System and Generation Equipments Tsinghua University Beijing

ISBN: (纸本)9781479917860

Stochastic time delay is a new challenge brought out by communication network in wide-area damping control system. Uncertainty introduced by stochastic time delay increases the difficulty of modeling and stability analysis. In this paper, a new approach of stability analysis through expectation model is proposed to solve the problem of uncertainty in wide-area controlled power systems considering the effect of stochastic time delay. In the proposed method, expectation model considering detailed stochastic time delay distribution is derived to accurately model the impact of communication network on wide-area control performance. Then, through matrix transformation of expectation model, eigenvalue of wide-area damping control system considering time delay can be calculated, which can be used for analyzing the system stability. Finally, the effectiveness of this method is verified through the simulation of a power system with 8 generators and 36 nodes with different types of time delay distribution.

关键词： Delay effects power system stability Stability analysis Eigenvalues and eigenfunctions Stochastic processes Damping Analytical models

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Analysis of Ant Colony Algorithm for Finding the Optimal Circuitous Route in the Communication Network of power system

Analysis of Ant Colony Algorithm for Finding the Optimal Cir...

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International Conference on Electric Utility Deregulation and Restructuring and power Technologies

作者： Xin Chen Zhiqian Bo Xinzhou Dong Shenxing Shi State Key Laboratory of Control and Simulation of Power System and Generation Equipments Tsinghua University Beijing China

ISBN: (纸本)9781467371070

The communication network of power system is often damaged after a disaster. To solve this problem, this paper uses ant colony algorithm to find the optimal circuitous route. simulation results show that the method is fast, which can accelerate the recovery of the communication network. Besides, this paper does some research on the dead end problem, and analyses relationship between degree of adjacency and ratio of coming to a dead end. The result shows that the efficiency of ant colony algorithm can be improved only if it tries to avoid coming to dead ends.

关键词： ant colony algorithm circuitous route degree of adjacency dead end

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Wind Turbine Fault Diagnosis system Based on A Fuzzy Expert system

Wind Turbine Fault Diagnosis System Based on A Fuzzy Expert ...

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2015 International power,Electronics and Materials Engineering Conference(IPEMEC 2015)

作者： Wenguang Yang Dongxiang Jiang State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Thermal EngineeringTsinghua University

ISBN: (纸本)9781510806474

A fuzzy expert system which can simultaneously support many kinds of rules including fuzzy production rule,fault tree and decision tree in a unified framework are *** rete algorithm is adopted to speed up the fuzzy reasoning chain.A wind turbine diagnosis expert system is developed based on the fuzzy expert *** data is employed to verify the feasibility of the inference engine,and the results show that with proper knowledge imported the misdiagnosis rate is low,the inference process can be exported and the match degree of the health rule can be used as a health state indicator.

关键词： Wind turbine Fault diagnosis system Fuzzy expert system Fuzzy Rete algorithm

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Ambient signal based load model parameter identification using optimization method

Ambient signal based load model parameter identification usi...

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IEEE General Meeting power& Energy Society

作者： Xinran Zhang Chao Lu Yingduo Han Songtai Yu Jifeng Wang He Huang Yinsheng Su State Key Laboratory of Control and Simulation of Power System and Generation Equipments Tsinghua University Beijing China China Southern Power Grid Guangzhou China

Load modelling is a crucial part in modelling a power system. The complex, nonlinear and stochastic characteristics of power load increase the difficulty of modelling. In this paper, a new approach of ambient signal based load model parameter identification method is proposed to solve this problem. With the proposed method, load model parameter can be identified in any time regardless of the existence of fault. First, Z+M model is simplified to reduce the number of parameters to be identified. Then, parameters of Z+M model are identified with an optimization method, the objective function of which is calculated from WAMS measured power and voltage data. An iterative process is proposed to solve the problem of initial value sensitivity in optimization problems. Finally, the effectiveness of this identification method is validated through the simulation results on WSCC three machines nine nodes system under different operation situation including both small disturbance and large disturbance.

关键词： Load modeling Optimization Integrated circuit modeling Parameter estimation Data models Reactive power power measurement

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Dynamic Response of Rubbing Happening in a Flexible Rotor-Bearing system

Dynamic Response of Rubbing Happening in a Flexible Rotor-Be...

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2015 International Conference on Electrical, Automation and Mechanical Engineering(EAME 2015)

作者： J.M.Chen D.X.Jiang T.T.Deng J.S.Wang J.L.Zhong S.B.Wang State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Thermal Engineering Tsinghua University Guizhou Electric Power Research Institute

ISBN: (纸本)9781510806528

To reduce the steam loss and raise the efficiency of the steam turbine,the vapour seals are applied in the inner cylinder of the steam *** small gap may easily results in the rubbing happening in the inner ***,the rotor is a flexible *** this paper,dynamic response of rubbing happening in a flexible rotor-bearing system was studied.A simplified flexible rotor-bearing system was constructed,whose rotating speed was between the 1st and 2nd critical rotating *** effect was considered in the analysis,*** rubbing introduce heat and result in the thermally induced *** transient thermal bow was treated as a pair of moments functioning on the shaft segment where rubbing *** shows the amplitude and phase of vibration would be stable after a long *** severity of rubbing affect the stabilization time,which could be regarded as a diagnostic feature to identify the severity of rub happening in a flexible rotor-bearing system.

关键词： thermally induced vibration equivalent thermal moment stabilization time rubbing flexible rotor-bearing system

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A real-time wind power control method for power systems with high wind power penetration and its implementation

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Dianli Xitong Zidonghua/Automation of Electric power systems 2015年第21期39卷 23-29页

作者： Wang, Bin Sun, Yong Wu, Wenchuan Zheng, Taiyi Zhang, Boming State Key Laboratory of Control and Simulation of Power System and Generation Equipments Tsinghua University Beijing100084 China Department of Electrical Engineering Tsinghua University Beijing100084 China State Grid Jilin Electric Power Supply Company Changchun130021 China

A real-time wind power control method is proposed to accommodate the severe fluctuation of wind power, which can be used in power systems with high wind power penetration. The maximum allowable wind power generation is estimated online according to the automatic generation control (AGC) downward spinning reserve and the tie-line power deviation. Considering the different priorities for wind farms and the transmission security constraints, different control strategies, such as corrective control to eliminate the transmission congestion, optimal dispatch considering the trade-off between minimum curtailment of wind power and the fairness among wind farms, are integrated in the proposed method. The numerical simulation on the test system and the results of field operation in a provincial power grid show that the method is efficient and practical. © 2015 Automation of Electric power systems Press.

关键词： Wind farm

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Adaptive Sliding Mode control of Flexible Load Driven by Motors considering the damping

Adaptive Sliding Mode Control of Flexible Load Driven by Mot...

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International Conference on Electrical Machines and systems

作者： Youshuang Ding Xi Xiao State Key Lab of Security Control and Simulation of Power Systems and Large Scale Generation Equipment Department of Electrical Engineering Tsinghua University China

ISBN: (纸本)9781467388634

This paper presents an adaptive sliding mode controller for the system of flexible load driven by motors with the damping and friction considered. The controller comprised the sliding mode controller and the Kalman estimator. Firstly, the parameter uncertainties and disturbance are modeled with a bounded variable and then an integral sliding surface is designed. Then, to relax the requirement for the bound of uncertainties, a Kalman state estimator is proposed to estimate the bound of uncertainties and the unmeasurable states. With the proposed control structure, the vibration caused by the flexibility can be suppressed and besides, the controller is robust to a wide range of parameter uncertainty and disturbance. The performance of the control strategy is verified via simulation and experimental results.

关键词： Flexible joint flexible manipulator sliding mode adaptive Kalman filter

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Secondary voltage control considering rapid dynamic reactive power compensation

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Dianli Xitong Zidonghua/Automation of Electric power systems 2015年第2期39卷 53-60页

作者： Wang, Xuran Guo, Qinglai Sun, Hongbin Wang, Bin Zhang, Mingye Zhang, Boming Department of Electrical Engineering Tsinghua University Beijing100084 China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Tsinghua University Beijing100084 China

This paper presents a secondary voltage control system considering rapid dynamic var compensators, such as static var compensator/static synchronous compensator (SVC/STATCOM). In order to take full advantage of the rapid adjustment feature of SVC/STATCOM in static voltage control and transient voltage stability, two independent control stages are dealt with. In the first stage, SVC/STATCOM and conventional var compensators are incorporated in the coordinate secondary voltage control model to bring the rapid adjustment feature of SVC/STATCOM into full play. In the second stage, a quadratic programming model is designed to do the optimal control of the dynamic reactive power reserves. The reactive power compensation of the slow dynamic var compensators is substituted for that of SVC/STATCOM, and the dynamic reactive power reserves level is improved. Through coordination between sequence and space, all kinds of reactive power compensators are made full use of in the secondary voltage control and transient voltage stability prevention control. Nordic system test results show that the system can greatly improve the response speed of traditional secondary voltage control while avoiding the conflict between SVC/STATCOM and the traditional reactive power compensators. At the same time, the system is able to carry out effective preventive control of transient voltage stability and improve the recovery effect of system voltage after the disturbance. ©, 2015 state Grid Electric power Research Institute Press.

关键词： Reactive power

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Natural Frequency and Dynamic Response of Rotor system of Steam Turbine Modelled with Euler-Bernoulli Beam

Natural Frequency and Dynamic Response of Rotor System of St...

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2015 International power,Electronics and Materials Engineering Conference(IPEMEC 2015)

作者： T.T.Deng J.S.Wang X.J.Li J.L.Zhong S.B.Wang S.P.An W.G.Yang D.X.Jiang Guizhou Electric Power Test and Research Institute State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Thermal EngineeringTsinghua University

ISBN: (纸本)9781510806474

Based on Finite element method(FEM),analysis of natural frequency and dynamics response is carried out in this ***,modeling of rotor system in steam turbines is analyzed with Euler-Bernoulli beam ***,natural frequency of the rotor system is obtained and ***,dynamic response of the rotor system is simulated and the vibration of the rotor system is *** results show that the proposed model can obtain results with high accuracy,and the model is *** modeling approach presented in this work provides a fast and accurate method in analyzing dynamic characteristics of the practical rotor system in steam turbine units

关键词： Natural frequency transient response rotor system steam turbine Euler-Bernoulli Beam

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