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World Non-Grid-Connected Wind power and Energy Conference, WNWEC

作者： Jie Chen Dongxiang Jiang State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Thermal Engineering Tsinghua University Beijing China

In order to fully understand the characters and working principles of non-grid-connected wind turbine, this paper makes an analysis on different methods for modeling non-grid-connected wind turbine. First, according to the structure of the wind turbine, a theoretical model is presented, including three subsystems: rotor, transmission system and generator. Response of the model to a wind sequence is simulated. Then, based on the data gained from experiment, a model of small wind turbine is presented using system identification. The main content of the model is the performance coefficient Cp derived from experimental data. A comparison is made on the simulation results of the model and the data measured. With simulation results of the two methods for modeling wind turbine, by using theoretical analysis and identification respectively, we can see the two models are both effective; only that they should be applied in different conditions.

关键词： Wind turbines Wind speed Wind energy generation Rotors power system modeling power generation Wind energy Analytical models power system simulation Load modeling

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Novel connection scheme of backup power supply adaptive to Distribution Line Non-Communication Protection and new criterion for high voltage and large capacity induction motor

Novel connection scheme of backup power supply adaptive to D...

引用

2009 Asia-Pacific power and Energy Engineering Conference, APPEEC 2009

作者： Liu, Kun Dong, Xinzhou Bo, Zhiqian State Key Lab of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing 100084 China AREVA T and D Automation Stafford ST17 4LX United Kingdom

ISBN: (纸本)9781424424870

This paper presents a new practical backup power supply connection scheme for Distribution Line Non-Communication Protection (DNCP). simulation tests have been conducted using the Alternate Transient Program (ATP) with respect to a typical single circuit breaker multi-section system. The results prove that the new scheme is able to not only recover the power supply of loads on healthy lines automatically, but also create disturbances in favor of Accelerated Over Current (AOC) criterion. Aiming at the failure of Directional Under Voltage (DUV) criterion derived from high voltage and large capacity induction motor load, a novel criterion using the increment of reactive power is proposed. © 2009 IEEE.

关键词： Induction motors

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An evaluation method for power supply capability of urban electric power distribution system based on “N−1” simulation analysis of transformers

An evaluation method for power supply capability of urban el...

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International Conference on Sustainable power Generation and Supply, SUPERGEN

作者： Fengzhang Luo Chengshan Wang Jun Xiao Shaoyun Ge Jianmin Wang Yinong Li Saiyi Wang Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University TJU Tianjin China Urban Power Supply Company Shanghai China

ISBN: (纸本)9781424449347

A proper evaluation on the power supply capability of urban distribution system is of enormous social and economical significance. In competitive marketing environment, to satisfy the sustainable growth of distribution loads, electric utilities must judge whether the return of power supply capability is sustainable and valued against the certain amount of investment. Therefore, to make up the insufficiency of traditional methods referring from the concept of total transfer capability of transmission system, this paper proposes a straightforward method to evaluate the power supply capability of distribution system, which is based on ldquoN-1rdquo simulation analysis of interconnected main-transformers under the ldquoN-1rdquo guideline. Firstly, a series of interconnected main-transformer groups are drawn from the main-transformers' interconnection analysis after the topological simplification of distribution system. Secondly, the maximum average load rates of main-transformers are concluded through the ldquoN-1rdquo simulation analysis of every interconnected group. Finally, based on a comprehensive analysis of all the interconnected groups' results, the maximum permissible load rate of each main-transformer can be obtained, thus the power supply capability of the entire distribution system can be calculated. Through the application in a district of Shanghai, China, the effectiveness and the accuracy of the method are demonstrated. The application results suggest that, the method presented in this paper based on ldquoN-1rdquo simulation analysis of interconnected main-transformers is a simple and practical tool, to evaluate the power supply capability of a distribution system, which will need only once calculation with constraint to the ldquoN-1rdquo guideline. Moreover, the interconnection weak-points and the interconnection bottlenecks of the distribution system can be identified easily with this approach, thus providing effective references for urban distribution

关键词： power supplies Analytical models Transformers power system interconnection Investments Guidelines power system economics power generation economics Environmental economics power industry

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Analysis of synchronous generator electro-magnetic torque and vibration with armature winding fault

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Tianjin Daxue Xuebao (Ziran Kexue yu Gongcheng Jishu Ban)/Journal of Tianjin University Science and Technology 2009年第4期42卷 322-326页

作者： Fang, Hong-Wei Xia, Chang-Liang Li, Guo-Ping Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin 300072 China Beijing Chatone Computer Room Equipment Company Beijing 100101 China

The air-gap magnetic field characteristic of the synchronous generator, caused by stator winding inter-turn short circuit fault, was analyzed in this paper with a consideration of the air-gap eccentricity. Then the characteristics of electro-magnetic torque and vibration of generator were obtained, especially the magnitudes and frequency variation of the instantaneous pulse torque. And the characteristic of the 17th and 19th order component of terminal current under this condition was also analyzed by the coupled field-circuit method. Lastly, in the dynamic simulation experiment, the vibration acceleration data in the vertical direction of a 7.5 kVA generator with stator winding inter-turn short circuit fault were acquired, and then these data were analyzed by discrete fast Fourier technique. The results show that the change of the double frequency vibration acceleration is bigger when stator winding inter-turn short circuit faults occur and the 17th and 19th order component of terminal current can be used to detect the dynamic eccentricity of machines with or without internal faults.

关键词： Stators

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Design of Adaptive Increment controlled Hybrid-Type Active power Filter

Design of Adaptive Increment Controlled Hybrid-Type Active P...

引用

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

作者： Dong Liu Bingda Zhang Xiaolei Zhang Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University TJU Tianjin China Daqing OilField Power Conglomerate Power Supply Company Heilongjiang China

HAPF (HAPF) is composed of an active power filter (APF) and a passive power filter (PPF), for integrated harmonic compensation of unbalanced or nonlinear loads and compensation of reactive power. The PPF tunes at special harmonics and compensates reactive power to improve the power factor. The APF is composed of two full controlled three-phase PWM inverters. It traces harmonic current on system line, and works as a controlled voltage source, injecting current into system to eliminating harmonic current generated by nonlinear loads. In structure design, the PPF supplies fundamental series resonance brunch for APF to avoid enduring fundamental voltage. It lowers the rated capacity of APF and reduces the volume of APF. The adaptive increment control method is employed, which is simple and fast responding. It enables the control of APF independent of the parameters of PPF. It makes the filter flexible to harmonics, and overcome the effect of input current of APF. simulation and experiment have been carried out. The result shows that the design achieves expected goals. The harmonic in system is reduced below expect level, and the filter is fast response and adaptive to the harmonic current.

关键词： Programmable control Adaptive control Active filters power harmonic filters Reactive power power system harmonics power filters Pulse width modulation inverters Nonlinear control systems Voltage control

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Sensitivity-Based Approach for Optimal power Flow with Transient Stability Constraints

Sensitivity-Based Approach for Optimal Power Flow with Trans...

引用

International Conference on Energy and Environment Technology (ICEET)

作者： Sun Wen Dazhong Fang Yuan Shiqiang Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University TJU Tianjin China Tianjin Electric Power Corporation Tianjin China

This paper presents a new method for optimal power flow with transient stability constraints (OTS). Based on the theory of projection energy function (PEF), the variation characteristic of minimum projection kinetic energy (PKE) in post-fault duration against generation of severely disturbed generators has been studied. The trajectory sensitivity mapping technique is utilized to evaluate the gradient of minimum PKE with respect to active power output of generators. Using the gradient, a new approach for stability-constrained generation limit assessment is proposed. Then the stability constraints represented by differential equation are converted into inequality constraints of active power outputs of generators. Thus, the OTS problem could be solved by traditional optimal power flow (OPF) method. The proposed approach can deal with multi-contingencies simultaneously. Case study on the 10-generator New England test power system is given to verify the efficiency of the method.

关键词： Load flow power system transients power system stability power generation power system simulation Kinetic energy Differential equations power system security Character generation system testing

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A Novel Approach for Dynamic Congestion Management in Open power Markets

A Novel Approach for Dynamic Congestion Management in Open P...

引用

International Conference on Energy and Environment Technology (ICEET)

作者： Zhenyu Xue D.Z. Fang Wen Sun Shiqiang Yuan Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University TJU Tianjin China Tianjin Electric Power Corporation Tianjin China

This paper presents a novel approach for dynamic congestion management (DCM) in an unbundled power system. In the DCM model, the objective function is constructed using the cost of the generation increment and an algebraic nonlinear programming is formulated. To establish the linear inequality of transmission limit constraints and transient stability constraints, generator shift factor and trajectory sensitivity are calculated, with which the nonlinear programming problem transforms into a linear programming. Hence, sequential quadratic programming is employed to assess the generation rescheduling for minimizing the objective function. A case study of DCM is performed on the 10-generator New England test system. Comparison between the proposed DCM and static congestion management (SCM) model verifies the validity of the model and the effectiveness of the method.

关键词： Energy management power markets power system dynamics power system management Nonlinear dynamical systems power system stability power system modeling power system transients Linear programming Cost function

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Application of Voltage Space Vector PWM in Electronic Load

Application of Voltage Space Vector PWM in Electronic Load

引用

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

作者： Guixiu Jiang Xiaolei Zhang Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University TJU Tianjin China Daqing Oil Field Power Conglomerate Power Supply Company Heilongjiang China

By analyzing the basic principle of voltage space vector PWM (SVPWM) and the AC electronic load which consists of voltage source PWM rectifier, a novel current control method is proposed. The control strategy combining the SVPWM and hysteresis current control technology is adopted. The vector of current error or the vector of differential of current error is used to select the most suitable voltage space vector, and control the current error in the limit of hysteresis band. The result shows that with the new scheme, the fast current response is gained and the current harmonic is eliminated, so that the dynamic performance of current tracking and the system stability are improved.

关键词： Space vector pulse width modulation power system simulation Current control Hysteresis Voltage control Rectifiers Switching frequency Circuits Laboratories power system harmonics

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A practical GIS-based decision-making support system for urban distribution network expansion planning

A practical GIS-based decision-making support system for urb...

引用

International Conference on Sustainable power Generation and Supply, SUPERGEN

作者： Fengzhang Luo Chengshan Wang Jun Xiao Shaoyun Ge Bo Yu Jianmin Wang Yinong Li Saiyi Wang Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University TJU Tianjin China SMEPC Urban Power Supply Company Shanghai China

ISBN: (纸本)9781424449347

The computer-supported decision-making system has become an essential tool for the sustainable growth and expansion planning of modern urban power distribution network. Current packages with planning functions are independent packages, which are limited in the academic research. Presently, in Shanghai Municipal Electric power Company and its subordinate units, a geographic information system(GIS)-based production management system(PMS) has been applied successfully as the working platform in most departments, which makes the further research on the computer-aided decision-making system possible and feasible. Taking the PMS as the graphics supporting platform, this paper studies and develops a practical GIS-based decision-making support system for urban distribution network expansion planning, which establishes a primary foundation for information-based planning, daily-frequent planning and elaborate planning. Firstly, the physical structure of the system is designed with a four-layer hierarchical architecture, including the data layer, platform layer, application layer and performance layer, which is suitable for object-oriented development to ensure the security and stability of the system. Secondly, to satisfy the requirements of distribution expansion planning, the main functions of the system are divided into seven modules according to the planning process abstracted in the computer, including the module of current situation analysis, load forecasting, substation locating and sizing, network planning, cable channel planning, economic evaluation of planning and so on. There is at least one or one set of practical mathematical models and methods for planning adopted in each module to ensure the accuracy and reasonableness of the final planning results. Finally, an actual planning of Shanghai, China is accomplished with the expansion planning system. The practical application achievements show that the system can not only optimize the expansion planning results of

关键词： Decision making Urban planning power system planning Process planning Computer networks Distributed computing power systems Packaging Production management Computer graphics

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Application of dielectric barrier discharge in the removal of NOx from diesel exhaust

Application of dielectric barrier discharge in the removal o...

引用

Conference on Electrical Insulation and Dielectric Phenomena, (CEIDP)

作者： B.X. Du H. J. Liu X. H. Wang K.F. Wang Key Laboratory of Power System Simulation and Control of Education Ministry School of Electrical Engineering and Automation Tianjin University TJU Tianjin China

Application of Non-thermal plasma for gas cleaning is gaining prominence in recent years, which can effectively remove NOx and other exhaust gases simultaneously. As the present researches are mostly adopting simulation gas for the investigation, this paper employed the NOx from the actual diesel exhaust as the investigated subject. Effects of the amplitude and frequency of voltage, the diameter of high-voltage electrode, the reactor volume and the discharge gap on NOx removal were studied based on dielectric barrier discharge. Obtained results indicate that, the removal rate of NOx increased first and then decreased with increasing the magnitude and frequency of the voltage. With decreasing discharge gap, the removal rate of NOx increased. With increasing the volume of reactor and the diameter of high-voltage electrode, the removal rate of NOx increased.

关键词： Dielectrics Electrodes Inductors Voltage Frequency Diesel engines Gases Plasmas Engine cylinders Air pollution

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