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Optimal speed control system of generator based on chaotic particle swarm optimization

Optimal speed control system of generator based on chaotic p...

引用

International Conference on Electrical and control Engineering, ICECE 2010

作者： Jiang, Huilan Liu, Yang Liu, Lin Ji, Huiqiang Shan, Dapeng Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin 300072 China Tianjin High Voltage Power Supplied Company Tianjin 300250 China

ISBN: (纸本)9780769540313

In view of real-time and operational requirements of the speed control system for generating, the method of determining the traditional PID control parameters seriously affected by the operator due to the use of the experience, not accurate enough. This paper proposed chaotic particle swarm optimization (PSO) and adjustment methods based on the traditional PID in the electro-hydraulic control, establish the state equation of the speed control system, and thus to design generator speed control system based on chaotic particle swarm optimization algorithm. The simulation experiments show that the regulator has better robustness and real-time compared to the traditional PID control method, and can provide optimal control in the light of the different types of the running point and the interference. © 2010 IEEE.

关键词： Three term control systems

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Discussion on setting calculation of loss-of-excitation protection for large turbogenerator

Discussion on setting calculation of loss-of-excitation prot...

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2010 International Conference on Electrical Machines and systems, ICEMS2010

作者： Yao, Siwang Wang, Weijian Luo, Ling Gui, Lin Qiu, Arui State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing China

Loss of excitation (LOE) is a common fault found in the generators. The most widely applied method for detecting a generator loss of excitation is the use of impedance relays to sense the variation of impedance as viewed from the generator terminals [1]. However, compared with China's approachs, in the setting of impedance circle, the IEEE's allow the circle to extend along the negative X axis, meanwhile, in the latest edition of the "IEEE Guide for AC Generator Protection", the circle is further extended, reaching to -1.25X_d.We think this is adverse, to prove our point, the paper ,basing on the IEEE 9 bus model and using computer digital simulation, have studied various loss-of-excitation conditions and some system disturbances that may lead to the relay false tripping. simulation results indicate that the IEEE's method not only can't accelerate the operation effectively, but also will increase the chances of maloperation.

关键词： Impedance Generators Relays Analytical models Power system stability Reactive power

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A method of collaborative multi-path load forecasting based on maximum entropy principle

A method of collaborative multi-path load forecasting based ...

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作者： Xiao, Jun Zhang, Xuan He, Lin Lin, Li-Peng Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin 300072 China Tianjin Electric Power Company Tianjin 300010 China

ISBN: (纸本)9781457700668

This paper introduces synergetic theory and proposes multi-path load forecasting automatically coordinated approach based on the maximum entropy principle. Taking the expectation and second order central moment of forecasted results into account and using the maximum entropy principle,this synergetic load forecasting method receives the probability distribution function of the forecasted values and obtains the final high, middle and low forecasting scheme based on the probability theory. Case study has shown the model and method mentioned above can take the affection of the conflicts among different forecasting path into account in forecasting, resulting in higher precision of load forecasting © 2010 Chinese Soc for Elec Eng.

关键词： Forecasting

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Study of distributed multiaxial intelligent tightening machine based on fieldbus control system

Study of distributed multiaxial intelligent tightening machi...

引用

International Conference on Intelligent control and Information Processing (ICICIP)

作者： Yunsheng Fan Chen Guo Wei Meng Department of Traffic Information Engineering and Control Navigation College Dalian Maritime University Dalian China Key Laboratory of Simulation and Control of Navigation System College of Information Science and Technology Dalian Maritime University Dalian China

We put forward a system structure of controlling the tightening operation of bolts using multiraxial tightening machine. A kind of fieldbus intelligent tightening control system is designed with the technology developing of fieldbus intelligent instrumentation. This system is a distributed structure based on fieldbus control system which consists of CAN bus, Profibus-DP bus, and adopts many advanced intelligent control methods. This system structure and intelligent control method study realizes integration of manufacture, control and management in the tightening of bolts and improves the level of network manufacture and information management of automobile industry. The integrating of tightening machine and fieldbus brings a new thought of automobile industry control technology.

关键词： Torque Fasteners Hardware Automobiles Torque measurement Force

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Study on transferred lightning overvoltage in microgrid

Study on transferred lightning overvoltage in microgrid

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Asia-Pacific International Symposium on Electromagnetic Compatibility

作者： Hongqiao Yu Shuiming Chen Pengcheng Yang State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University

ISBN: (纸本)9781424456215

If the microgrid is stroke by lightning, the lightning overvoltage which transferred though distribution transformer has great influence on the safety of the microgrid. The models of microgrid and high-frequency transformers are established based on the electromagnetic transient calculation program PSCAD/EMTDC. The transferred overvoltage with different lightning strike position in microgrid is researched in this paper. The effect of surge arresters on restricting overvoltage is also analyzed. The simulation results show that surge arresters must be installed at both sides of transformer due to the high overvoltage when the transformer has no load. If the transformer is connected with cables, the overvoltage will be reduced. The longer the cable is, the lower the overvoltage is. The types of loads have a little influence on the overvoltage.

关键词： Lightning Voltage control Power transformer insulation Frequency Capacitance Laboratories Power system simulation Power system modeling Power generation Electromagnetic modeling

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Study on lightning protection of cables and transformer in Microgrid

Study on lightning protection of cables and transformer in M...

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China International Conference on Electricity Distribution, CICED

作者： Hong-qiao Yu Shui-ming Chen Yang Peng-cheng State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing 100084 China

ISBN: (纸本)9781457700668

The cable and transformer are important distribution equipment in Microgrid. Due to the low insulation level, the insulation of them is easily damaged by lightning. The models of high-frequency transformer and the calculation model of induced lightning with transmission line based on electromagnetic transient calculation software PSCAD / EMTDC are designed in this paper. The lightning protection of cables and transformer in Microgrid, the transferred overvoltage of transformer and the effect of the length of cables and the load types to overvoltage level are researched. The conclusion shows that the induced overvoltage and transferred overvoltage could be reduced efficiently after installing surge arrester at the cables and transformer, but the direct lightning overvoltage is not reduced in the safety range; The longer the cables, the lower the overvoltage is; The inductively load can reduce the overvoltage level slightly while the capacitive and resistance loads has no influence.

关键词： Power cables Load modeling Arresters Cable insulation EMTDC Lead PSCAD

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Notice of Retraction: The Optimal Bidding Based On The Prospect Theory

Notice of Retraction: The Optimal Bidding Based On The Prosp...

引用

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

作者： Ji-keng Lin Xudong Wang Key laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin China

This article has been retracted by the publisher.

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A study on steady characters of inverter interfaced distributed generation in three phase symmetrical system

A study on steady characters of inverter interfaced distribu...

引用

International Conference on Power system Technology (POWERCON)

作者： Qiang Jin Yong-Li Li Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin China

Recently inverters are all-pervading used as the connective instrument of distributed generations and distributed power system. When inverter interfaced distributed generations are connected to the distribution system, it may bring some new problems on load flow and fault characteristic and protection. The analysis on steady characters of PQ control mode and VF control mode inverter interfaced distributed generation is done when the system is three phase symmetrical. Generally speaking there are limits on power and current in control system for the security of distributed generations and power electronic devices in inverter, so the analysis is more complex. The mathematical analysis on three phase symmetrical system is done and restriction equations are described whether three phase symmetrical fault occurs or not. For the solution of the equation groups expresses the steady state of the system, so the solution of the equation groups is one and only. Then the restriction equation groups are solved. The solution in different areas shows the reason of steady non-linear character of inverter interfaced distributed generations and the simulation shows the conclusion correct. The steady characteristic curves of PQ control mode and VF control mode inverter interfaced distributed generation about voltage and current and power are got from the function of voltage and current and power at the same time. PQ control mode and VF control mode inverter interfaced distributed generation behave similarly but not identically when three phase symmetrical fault occurs in three phase symmetrical system. The disadvantageous influence on protection is analysed by the way.

关键词： Equations Mathematical model

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Total Supply Capability and Ideal Total Supply Capability for distribution system: Definition, model and algorithm

Total Supply Capability and Ideal Total Supply Capability fo...

引用

China International Conference on Electricity Distribution, CICED

作者： Jun Xiao Wei Zhai Wenzhuo Gu Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University TJU China

ISBN: (纸本)9781457700668

This paper proposes the definition, model and algorithm of two quantitative indices named the Total Supply Capability (TSC) and Ideal Total Supply Capability (ITSC) for distribution planning. The TSC of a distribution system is comparable to Total Transfer Capability (TTC) in transmission systems, which is defined as the maximum load it can serve under the N-1 guideline for distribution systems, taking into account the capacities of the substation transformers, network link topology, link capacity, and other constraints. The ITSC of a distribution system is the calculated TSC which considers capacities of tie lines are large enough. Mathematical models for TSC and ITSC are set up and procedures to calculate TSC and ITSC are presented. Based on TSC and ITSC calculation, a concept named Potential Supply Capability(PSC) is proposed, which depicts the “potential” or “hidden” TSC of the distribution system. Finally, TSC and ITSC calculation have been performed in a test system with promising results. The case study has shown that TSC and ITSC algorithms are efficient approaches to analyze and evaluate the existing distribution system.

关键词： Load modeling Silicon Conductors Mathematical model

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Cascaded battery energy storage system based on dual active bridges and a common DC bus

Cascaded battery energy storage system based on dual active ...

引用

International Power Engineering Conference (IPEC)

作者： Yiding Jin Qiang Song Wenhua Liu Weixin Sun State Key Laboratory of Control and Simulation of Power System and Generation Equipments Tsinghua University Beijing China

Along with the increasing system capacity, large-scaled energy storage systems are supposed to be connected into 10kV or higher networks. Urban network has strict criterions on power quality of the power electronic devices connected. Moreover, the occupancy and noise of industrial frequency transformers also become restraints to the promotion of urban network energy storage. For that reason, this paper proposes a battery energy storage system based on cascaded dc-ac converter, dual active bridges, and a common dc bus. High frequency transformers are used to replace the industrial frequency transformer for insulation, and battery groups are connected to the common dc bus with respective dc-dc interfaces. This multilevel converter system is easy to modularize, easy to extend, and allows different kinds of batteries to work together. The main circuit and proper control system are designed, with the soft-switching condition and current control issues of the dual active bridge analyzed in detail. The simulation results from EMTDC model verify the operation principles and corresponding control strategies.

关键词： Batteries Voltage control Converters Switches Bridge circuits

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