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检索条件"机构=State Key Laboratory of Control and Simulation of Power System and Power"

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Breakdown phenomenon identification of biodegradable polyethylene film under UV-irradiation environment

Breakdown phenomenon identification of biodegradable polyeth...

引用

2008 International Symposium on Electrical Insulating Materials, ISEIM 2008

作者： Du, B.X. Liu, Yong Xia, Y.S. Liu, B.C. Key Laboratory of Power System Simulation and Control of Ministry of Education School of Electrical Engineering and Automation Tianjin University 92 Weijin Road Tianjin 300072 China Tianjin Electric Power Research Institute Tianjin 300022 China

Biodegradable polymers are increasingly expected for substitute of present insulating materials in the electrical and electronic devices. However, their electrical properties are not systematically confirmed and need further investigation. In this paper, biodegradable polyethylene (BDPE) films are employed as the specimens and high density polyethylene (HDPE) films are as the reference. The breakdown endurance of BDPE film is examined using bias DC voltage under UV-irradiation environments. The images of breakdown craters are captured through applying a monocular-video-zoom microscope. Both breakdown area and box dimension of breakdown craters are obtained by an image-pattern- identification technique. The results reveal that for both BDPE and HDPE films, the breakdown voltage, breakdown area and box dimension all decrease with the increase of UV-irradiation level. Based on comparison of the results, it shows that under UV-irradiation environment, breakdown endurance of BDPE film is better than that of HDPE film.

关键词： Biodegradable polymers

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Instantaneous energy balancing in three-level neutral point clamped converters

Instantaneous energy balancing in three-level neutral point ...

引用

IEEE Conference on Vehicle power and Propulsion (VPPC)

作者： Lu Ting Zhengming Zhao Liqiang Yuan Shuping Wang 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 China

Instantaneous energy balancing plays an important role in power electronics conversion. The unbalance of electromagnetic energy not only debases the system performance but also decreases the reliability and efficiency of the conversion. In this paper, instantaneous energy balancing problems in three-level neutral point clamped (NPC) converters are classified and discussed. Typical examples and their usual solutions of each kind of problems are expounded and compared. In the end of this paper, limitations and disadvantages of traditional methods are analyzed, and electromagnetic field method is summarized as the new trend to analyze electromagnetic energy transmission and exchange. The method using electromagnetic field theory is emphasized to be the better approach to solve the aforementioned energy balancing problems.

关键词： Voltage control Capacitors Open loop systems Pulse width modulation converters power electronics Energy storage Switching converters power system simulation power system reliability Electromagnetic analysis

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The scheme of single-phase adaptive reclosing on EHV/UHV transmission lines

The scheme of single-phase adaptive reclosing on EHV/UHV tra...

引用

IET 9th International Conference on Developments in power systems Protection, DPSP 2008

作者： Bin, Li Shuo, Zhang Crossley, P. Bo, Zhiqian Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin 300072 China Manchester University United Kingdom AREVA T and D Automation and Information Stafford United Kingdom

ISBN: (纸本)9780863419027

Automatic reclosure (AR) is extremely effective in improving the reliability, stability and security of the overall power system. However, the present autoreclosure operates blindly and practices employing a fixed time. In the case of permanent fault, a second shock to the system can cause irreparable damage to expensive equipments. According to characters of transient faults and permanent faults, this paper introduces the method of Bergeron line model into the field of single-phase adaptive reclosing (SPAR). Therefore, the paper proposes a novel scheme based on the calculation of Bergeron model to realize SPAR. Theoretical analysis and simulation prove that the proposed scheme of single-phase adaptive reclosing is valid with high sensitivity and reliability.

关键词： Reliability analysis

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Intelligent controller for LEDs lighting systems supplied by batteries

Intelligent controller for LEDs lighting systems supplied by...

引用

IEEE Conference on Vehicle power and Propulsion (VPPC)

作者： Bo Feng Zhengming Zhao Yingchao Zhang Dejia Zhou Liqiang Yuan State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China

LED lighting system supplied by batteries is one of effective solutions to vehicle and photovoltaic lighting systems. In order to improve lighting performance and prolong the life of LEDs and batteries, this paper proposes a novel intelligent controller for LED lighting systems. Stage constant current (SCC) control strategy is proposed, which determines the optimal working current of LEDs (I ref ) according to their ambient temperature and the capacity of batteries. For implementing SCC control strategy, a new control algorithm of double current loops and feedforward (DCLF) control is proposed based on Boost converter with constant current source. Both output current and inductor current are used as feedback control variables and input voltage is employed as feedforward compensation in the proposed algorithm. simulations have been conducted using PSIM software; and based on that, a 50 W photovoltaic LED lighting system has been developed to implement a serial of comparative experiments. The results show the advantages and validity of DCLF algorithm, such as excellent dynamic performance and good robustness.

关键词： Lighting control control systems Light emitting diodes LED lamps Photovoltaic systems Solar power generation Battery powered vehicles Optimal control Temperature control Inductors

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A novel Modbus RTU-based communication system for adjustable speed drives

A novel Modbus RTU-based communication system for adjustable...

引用

IEEE Conference on Vehicle power and Propulsion (VPPC)

作者： Hu Sideng Zhao Zhengming Zhang Yingchao Wang Shuping State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China

ISBN: (纸本)9781424418480

The communication protocol is important for applying adjustable speed drive (ASD) systems to an industry network. This paper proposes a novel scheme of communication system for the ASD system based on Modbus protocol. The most remarkable advantage of the approach lies in the tradeoff between performance and economic cost for a power converter system. The overall system is built on master-slave structure and easy for interacting with other networks. An additional study on the cyclic redundancy check (CRC) in Modbus RTU is introduced to obtain the optimization design in the actual application and the optimization method in software design is also presented. The performance of the communication system obtained from experiment conducted on the 15 kW ASD system validates the effectiveness of the proposed design method.

关键词： Variable speed drives Protocols Cyclic redundancy check Communication industry power system economics power generation economics Costs Master-slave Design optimization Application software

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Research of Position Sensorless control of PMSM Based on High Frequency Signal Injection

Research of Position Sensorless Control of PMSM Based on Hig...

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11th International Conference on Electrical Machines and systems(第11届国际电机与系统会议)

作者： Yiguang Chen Luyi Wang Lingbing Kong Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University China

The paper introduces a sensorless control method which is called high frequency (HF) injection for salient-pole permanent magnet synchronous motor (PMSM). High frequency signal injection means to inject three phase symmetric constant amplitude voltage into the stator of PMSM. If the rotor has saliency, the current magnetic field of HF voltage signal must be influenced by the modulating function of the salient pole rotor, and then a HF carrier wave relating to the position of the rotor will appear. From these carrier wave signals, the position information of the rotor can be further extracted, and the special position of the rotor can be accordingly decided. The self-detecting process of PMSM rotor position is simulated which proves the effectiveness of this method.

关键词： Sensorless control Frequency Hafnium Voltage Rotors Permanent magnet motors Stators Magnetic fields Magnetic modulators Data mining

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Fast assessment of regional voltage stability based on WAMS

Fast assessment of regional voltage stability based on WAMS

引用

IEEE Asia-Pacific Conference on Circuits and systems

作者： Jinli Zhao Yuan Zeng Wei Wei Hongjie Jia Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin China

Voltage stability margin of regional network is not a fixed quantity but closely related to operation condition and operation constrains. This paper proposes an effective method to estimate the real-time voltage stability margin based on some locally synchrophasor measurements. A Radial Basis Functions (RBF) neural network is employed to estimate the regional margin. The validity of the method is illustrated by case studies on the IEEE 30-bus system.

关键词： power system stability Voltage control power system transients Impedance power system relaying control systems power transmission lines Reactive power control power system interconnection Laboratories

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Non-intrusive method for on-line power load decomposition

Non-intrusive method for on-line power load decomposition

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China International Conference on Electricity Distribution, CICED

作者： Yi-xin Yu Peng Li Chun-liu Zhao Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University 300072 China

A novel non-intrusive method for on-line power load decomposition is introduced. This method is based on the following fact, that in normal operation states of electrical appliances, steady-state currents (including fundamental current and harmonic currents) of electrical appliances have normally certain statistical regularity. In such cases, a power load current can be approximately estimated by the linear superposition of the currents components of n main types of electrical appliances, when the power load consists of n main types of electrical appliances. The subject of the power load decomposition is to calculate a group of reasonable weight coefficients by an optimization method, so that the estimation current has the maximum similarity with the real current. The experimental results indicate that this method of load decomposition not only has higher precision and better stability but also is easy to be realized on-line.

关键词： Electrical products Steady-state Voltage Hardware power system planning power system harmonics Monitoring power system transients power system simulation power measurement

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A control Strategy of Direct Driven Permanent Magnet Synchronous Generator for Mazimum power Point Tracking in Wind Turbine Application

A Control Strategy of Direct Driven Permanent Magnet Synchro...

引用

11th International Conference on Electrical Machines and systems(第11届国际电机与系统会议)

作者： Yiguang Chen Zhiqiang Wang Yonghuan Shen Lingbing Kong Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University 300072 China

A novel maximum power point tracking (MPPT) strategy is presented in the paper. When wind speed varies, the wind turbine could obtain a big torque difference by adopting the novel strategy to achieve the aim of tracking the optimum turbine speed fleetly. The square wave permanent magnet synchronous generator (PMSG) is adopted in this paper for considering the characteristic of the diode rectifier-Boost circuit-voltage source inverter power transformation structure. The DC-link capacitor voltage is maintained at a constant value by ensuring the balance of the input and output energy of the both sides of the capacitor. The independent control of boost circuit and inverter is achieved. The simulation results indicates that compared with the conventional MPPT strategy, the efficiency of the turbine capturing wind energy by adopting the novel MPPT strategy is enhanced. And the independent electric control mode not only ensures the stability of generation system operation but also strengthen the flexibility and compatibility of system control.

关键词： Permanent magnets Synchronous generators Wind turbines Inverters Capacitors control systems Wind speed Torque Diodes Magnetic circuits

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Investigation and Analysis of the Influence of Magnetic Wedges on High Voltage Motors Performance

Investigation and Analysis of the Influence of Magnetic Wedg...

引用

Vehicle power and Propulsion Conference

作者： Shuping Wang Zhengming Zhao Liqiang Yuan Buyao Wang Department of Electrical Engineering State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China Anhui Electric Power Research Institute Department of Electrical Engineering State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China Department of Electrical Engineering State Key Laboratory of Control and Simulation of Power System and Generation EquipmentTsinghua University Beijing China Corporation Company Ltd. Of XiangTan Electric Machine XiangTan China

ISBN: (纸本)9781424418480;9781424418497

To weaken the pulsation of the harmonic magnetic field and improve the wave of the air-gap magnetic field in high voltage motors because of their open slots, magnetic slot wedge should be imbedded into the slot opening. In the paper, through analyzing the air-gap magnetic field distribution of large-scale motors affected by embedding magnetic slot wedges in open slots, the influence of magnetic slot wedge on the motor parameters and performance is discussed in theory. The finite element analysis (FEA) and the experiment results were given, which not only proves the validity of the analysis in the paper, also through the simulation results the proper parameters of magnetic slot wedges for best performance of motors were concluded, which provides a theoretical reference for the manufacturers when choosing or processing magnetic slot wedges.

关键词： Air-gap Magnetic Field Magnetic Slot Wedges Motor Performance

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