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Effects of interfacial pressure on tracking failure at XLPE cable joint by analyzing discharge light distribution

Effects of interfacial pressure on tracking failure at XLPE ...

引用

IEEE International Conference on Solid Dielectrics (ICSD)

作者： B. X. Du L. Gu Key Laboratory of Power System Simulation and Control of Ministry of Education Department of Electrical Engineering School of Electrical Engineering and Automation Tianjin University TJU Tianjin China

This paper investigated the effects of interfacial pressure on the discharge and tracking failure at the interface between XLPE and silicon rubber by analyzing the distribution of discharge light emitted during the failure process. The test sample was made by pressing together a piece of XLPE and a piece of transparent silicon rubber with the pressure of 20 kN/cm 2 , 100 kN/cm 2 and 300 kN/cm 2 , respectively. Test voltage was applied to a pair of plate-needle electrodes sandwiched at the interface with the insulation distance of 10 mm. The initial discharge voltage, the discharge light from discharge to tracking failure and the tracking patterns after failure were recorded with a digital camera. Then the discharge light was analyzed with an image processing method. Results show that the initial discharge voltage increases with the increase of pressure, which significantly influences the distribution characteristics of the discharge light and tracking pattern at the interface. The analysis of discharge light distribution is helpful in understanding the failure process and its mechanism at the interface between XLPE and silicon rubber found in prefabricated cable joint.

关键词： Discharges Insulation life Degradation Brightness Power cables Rubber Silicon

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Effect of temperature on electrical tree in silicone rubber

Effect of temperature on electrical tree in silicone rubber

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IEEE International Conference on Solid Dielectrics (ICSD)

作者： B. X. Du Z. L. May Gao T. Han Key Laboratory of Power System Simulation and Control of Ministry of Education Department of Electrical Engineering School of Electrical Engineering and Automation Tianjin University TJU Tianjin China

In this paper, room temperature vulcanized (RTV) silicone rubber (SiR) was employed as test sample to investigate the relationship between electrical tree propagation characteristics and the experiment temperature. Both the structures and growth characteristics of electrical tree in SiR were observed by using a digital camera and a microscope system. Obtained results show that electrical tree in RTV SiR is white gap tree channel, which all initiate from single branch, and the width of initiative single branch channel varies a lot with the electrical tree structure. The structure of electrical tree at experiment temperature from 30°C to 90°C in RTV SiR can be classified into four categories. They are branch, bush, pine branch and bush-pine mixed tree. The distribution of tree structures changes with the experiment. At the temperature of 30°C, branch tree take up a great proportion, however, bush tree becomes the dominant structure when the temperature rise up to 60°C and 90°C. The probability of tree initiation decreases obviously with the rise of the experiment temperature from 30°C to 90°C. All kinds of electrical tree grow rapidly in the first beginning of the treeing propagation, and this process lasts only a few minutes. In addition, a new parameter, the treeing proportion is introduced to describe propagation characteristics of bush tree.

关键词： Electrodes Rubber Temperature distribution Needles Power cables Cable insulation

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Reactive Power Compensation Devices Optimization Based on Improved Ant Colony Algorithm

Reactive Power Compensation Devices Optimization Based on Im...

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International Conference on Electrical and control Engineering (ICECE)

作者： Huilan Jiang Ming He Lin Liu Huiqiang Ji Dapeng Shan Key Laboratory of Power System Simulation and Control Ministry of Education Tianjin University TJU Tianjin China Tianjin High Voltage Power Supplied Company Tianjin China

In the assumption that all load nodes are installed reactive power compensation device, injecting a variety of disturbances to the grid, through the application of improved ant colony algorithm, we can obtain the optimal control sequence under disturbance, that is current switching reactive power compensation device node location. Comparing control sequences under the various perturbations, with circulation mechanism of successive exclusion, the best installation location of reactive power compensation devices is obtain, while the system voltage deviation smaller, improving power system operation economy. In this paper, there is a planning example, the results show that the proposed method is feasible.

关键词： Reactive power Voltage control Biological system modeling Simulated annealing Heuristic algorithms

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Analysis of Windup in Brushless DC Motor Speed Regulating system and its control

Analysis of Windup in Brushless DC Motor Speed Regulating Sy...

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The 8th World Congress on Intelligent control and Automation(第八届智能控制与自动化世界大会 WCICA 2010)

作者： Zhaoxia Xiao Hongwei Fang School of Electrical Engineering and Automation　Tianjin Polytechnic University Tianjin 300160 Chin Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Ti

The windup phenomenon caused by the current limitation and PWM voltage regulation in the brushless DC motor (BLDCM) double PI loop speed regulating system has been investigated. And the anti-windup controller has been applied to suppress the relevant windup phenomenon. The simulation illustrates that the anti-windup controller make the BLDCM speed regulating less overshoot and quickly dynamic response. And it also has the same anti-disturb performance while the BLDCM running with external load disturb and/or internal resistor, inductance and inertia variation. The results have good reference for the design of BLDCM and the performance enhancement of the BLDCM speed regulating system.

关键词： Stators Windup Torque Resistance Brushless DC motors Inductance simulation

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An Improved Under Frequency Load Shedding Scheme Based on Rate of Change of Frequency

An Improved Under Frequency Load Shedding Scheme Based on Ra...

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International Conference on Electrical and control Engineering (ICECE)

作者： Huilan Jiang Geng Yan Huiqiang Ji Lin Liu Dapeng Shan Key Laboratory of Power System Simulation and Control Ministry of Education Tianjin University TJU Tianjin China Tianjin High Voltage Power Supplied Company Tianjin China

In allusion to the traditional UFLS scheme's deficiencies of changeless frequency setting value and amount of load shedding of every run, this paper proposes improved UFLS scheme which can alter the frequency setting value of the first run and the amount of load shedding of every run dynamically according to the magnitude of frequency change rate, namely the insufficient amount of active power. The simulation results of stand-alone model show that the reformative UFLS scheme can restrain the frequency falling depth effectively, fit speed controller preferably, make full use of system rotating spare capacity, and reduce the amount of load shedding and the possibility of over-cut or owes-cut.

关键词： Load modeling Generators Power system dynamics Mathematical model Time frequency analysis

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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...

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International Conference on Electrical and control Engineering (ICECE)

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

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.

关键词： Particle swarm optimization Chaos Generators Optimization Algorithm design and analysis Velocity control

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Impacts of motor load on the transient stability of the MicroGrid

Impacts of motor load on the transient stability of the Micr...

引用

World Congress on Intelligent control and Automation (WCICA)

作者： Zhaoxia Xiao Hongwei Fang School of Electrical Engineering and Automation Tianjin Professional University Tianjin China Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University TJU Tianjin China

Transient stability of a MicroGrid in which the micro sources using the peer-to-peer and master-slave control was investigated. The P-f and Q-V droop control was used for micro sources 1 and 2. And the PQ control was used for micro source 3. The impacts of motor load on the transient stability of the MicroGrid were shown when the motor load starts, load power changes and a three-phase faults happens. And the power sharing between each micro sources and the main frequency supporting are achieved. simulation results have verified the effectiveness of the proposed control strategy.

关键词： Stability analysis Power system stability Transient analysis Automation Inverters Distributed power generation

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A Pi-based control scheme for primary cascaded H-bridge rectifier in transformerless traction converters

A Pi-based control scheme for primary cascaded H-bridge rect...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Tao Xinghua Li Yongdong Sun Min Department of Electrical Engineering Naval University of Engineering China State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University China

Cascaded H-Bridge rectifier (CHBR) is a more attractive solution in traction application for its transformerless structure. Because of the currents of different cells are exactly the same one, it is a challenge job to regulate the voltages of cells with only one current controller. In this paper, a PI-based control scheme is presented to deal with the voltages balance issue in CHBR. To satisfy the demand of rectifier such as unity power factor and regulated output DC voltages, the proposed control scheme consists of two parts. One is for shaping the grid current waveform and regulating the sum of DC-link voltages of all the cells; the other one is for balancing DC-link voltages. The latter is more concerned in this paper and is discussed in detail especially. simulations and experiments are carried on. The results verified the feasibility and effectiveness of the proposed scheme.

关键词： Rectifiers Voltage control Voltage measurement Converters Pulse width modulation Mathematical model

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State of the art of hybrid excitation permanent magnet synchronous machines

State of the art of hybrid excitation permanent magnet synch...

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作者： Wang, Shanming Xia, Yonghong Wang, Xiangheng Su, Pengsheng Huang, Shaogang Zhang, Anming State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing 100084 China Department of Electrical and Automatic Engineering Nanchang University Nanchang Jiangxi 330031 China Military Deputy Department Dalian 426 Factory No.1 Yanhai Jie Xigang Qu Dalian Liaoning 116005 China

ISBN: (纸本)9788986510119

The hybrid excitation permanent magnet machine (HEPMM) combines two kinds of excitation: permanent magnet (PM) and electrical excitation, so it possesses the advantages of PM machines and overcomes the incapability of regulating the excitation field. By now many HEPMM schemes have been presented. In this paper the operation principle, structure, advantages and disadvantages of these HEPMMs have been reviewed and compared in detail. These HEPMMs are classified into three types by new classification method - placement of PM and iron poles. At last novel harmonic excitation HEPMM is proposed and discussed.

关键词： Permanent magnets

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State of the art of hybrid excitation permanent magnet synchronous machines

State of the art of hybrid excitation permanent magnet synch...

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2010 International Conference on Electrical Machines and systems, ICEMS2010

关键词： Iron Magnetic fields Windings Stator cores Rotors Stator windings Magnetic circuits

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