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Selection method of transformer interconnecting distributed generation and distribution networks

Selection method of transformer interconnecting distributed ...

引用

IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Shouzhen Zhu Lin Geng Jinghong Zheng Xiaoyu Wang DaeHee Choi Yang Li State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing China

Recently, DG (distributed generation) is rapidly developed around the world. But there are several problems in the grid-connected operation. The paper focuses on the selection of proper transformers to meet the grounding requirements in the distribution networks. Through theory analysis and simulation, optimal selection methods are proposed. Yg/¿-connection transformer is suitable for small resistance grounding distribution networks while ¿ /Yg and ¿ / ¿ connection transformers are fit for small current neutral grounding networks. The conclusions are useful for the DG-connected power system.

关键词： Distributed control Grounding Power transformer insulation Power system simulation Coils Power system interconnection Distributed power generation Ferroresonance Voltage Power generation

来源：评论

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Study on modeling and simulation of non-grid-connected wind turbine

Study on modeling and simulation of non-grid-connected wind ...

引用

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

来源：评论

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Test system of a small wind turbine under laboratory conditions

Test system of a small wind turbine under laboratory conditi...

引用

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

作者： Dongxiang Jiang Qian Huang Liangyou Hong State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Thermal Engineering Tsinghua University Beijing China

As a clean, renewable, widely distributed, non-polluting energy, wind power plays an important role in the world's renewable energy development. In order to ensure the stable operation of wind turbines using non-grid-connected wind power, as well as the efficient utilization of wind resources, a study of condition monitoring of wind turbines is necessary. A test system of wind turbines under laboratory conditions based on a LabView platform has been designed and the system has been applied on small wind turbine test bed to test the performance of output power and vibration characteristics. The result of simulation testing has verified the effectiveness of the test system.

关键词： system testing Wind turbines Laboratories Power generation Vibration measurement Wind energy Wind energy generation Power measurement Rotors Acceleration

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Research on fault mechanism of icing of wind turbine blades

Research on fault mechanism of icing of wind turbine blades

引用

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

作者： Minghao Zhao Dongxiang Jiang Shaohua Li State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Thermal Engineering Tsinghua University Beijing China

In this paper, fault mechanism of icing of wind turbine blades is studied theoretically and experimentally. First, the aerodynamic performance of a wind turbine's primary airfoil under normal and icing conditions are simulated using Fluent software separately to analyze the geometry effect of icing on wind turbine. Then the formation and characteristics of vibration signal on main shaft caused by mass unbalance of wind turbine's rotor are analyzed using rotor dynamics theory to evaluate mass effect of icing on wind turbine. Finally, corresponding experiments are carried out on a self-made small wind turbine under laboratory conditions to testify the former theoretical analysis.

关键词： Wind turbines Blades Aerodynamics Automotive components Solid modeling Analytical models Software performance Performance analysis Geometry Shafts

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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

来源：评论

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The application of the data mining based on adaptive immune algorithm for power transformer, fault diagnosis

The application of the data mining based on adaptive immune ...

引用

International Conference on Cyber-Enabled Distributed Computing and Knowledge Discovery, CyberC

作者： Lin Jikeng Wu Congmin Wang Dongtao Key Laboratory of Power System Simulation and Control Tianjin University TJU Tianjin China Tianjin Engineering Normal College Tianjin China

Adaptive immune algorithm based data mining (AIA-data mining) is presented for fault diagnosis of power transformer. The information entropy is used for the production of the initial population, which leads to convergence speed of the algorithm to be faster than that of the initial population produced by random. On the basis of that, the bi-level search mechanism of the AIA further speeds up extraction of the decision-making table for the transformer fault diagnosis from the samples. Results from examples show that the method proposed is effective and feasible.

关键词： Data mining Power transformers Fault diagnosis Power transformer insulation Oil insulation Information entropy IEC standards Convergence Diagnostic expert systems Dissolved gas analysis

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Analysis of the increase of distribution network efficiency in parallel operation of the main transformers in high-voltage substations

Analysis of the increase of distribution network efficiency ...

引用

International Conference on Sustainable Power Generation and Supply, SUPERGEN

作者： Jun Xiao Hua Li Fengzhang Luo Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University TJU Tianjin China Tianjin University TJU Tianjin China

ISBN: (纸本)9781424449347

Based on the basic concepts and analysis methods of power supply capability, the paper analyzed the increase of distribution network efficiency in parallel operation. Firstly, the analysis process and formulas of the power supply capacity in parallel operation under general connection mode was given. And then the hand-in-hand connection mode was adopted as the specific network connection mode. The increased range of the power supply capability was obtained in parallel operation compared to split operation under different settings of main transformers in stations, different connection modes in stations and different network connection degrees. Finally, the conclusion that the power supply capability can be improved significantly in parallel operation without full network connection was obtained.

关键词： Transformers Substations Power supplies Power system reliability Information analysis Power system interconnection Switches Network topology Laboratories Power system simulation

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Protection schemes for closed loop distribution network with distributed generator

Protection schemes for closed loop distribution network with...

引用

International Conference on Sustainable Power Generation and Supply, SUPERGEN

作者： Bin Li Xuan Yu Zhiqian Bo Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin China Tianjin University TJU Tianjin China AREVA T and D UK

ISBN: (纸本)9781424449347

The paper proposes the protection schemes for closed loop distribution network with distributed generators. Generally, Most of distribution networks are operated in radial or open loop due to the security and protection limited. With the rapid expansion of modern power systems and demand for high quality of power supply, the closed loop operation is adopted gradually. Furthermore, with the increasing penetration of distributed generators, radial operation is not suit for improving stability of system and distributed generators. This paper investigates the protection requirements of closed loop network, and then analyzes the characteristics of conventional protection schemes which are applied in closed loop distribution network. Taking into distributed generators consideration, the paper proposes pilot wire instantaneous protection for closed loop network. What's more, non-communication over-current protection is also investigated to be applied in closed loop network. The proposed protection schemes are able to significantly improve the reliability and security of closed loop distribution network with distributed generators.

关键词： Power system protection Switches Distributed power generation Power system stability Power system security Power supplies Circuit faults Power system relaying Protective relaying Power system reliability

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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...

引用

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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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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