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Optimum parameters and maximum torque performances of the synchronous reluctance machine

Optimum parameters and maximum torque performances of the sy...

引用

International Conference on Electrical Machines and systems (ICEMS)

作者： Wang Shijing Zhao Zhengming Guo Wei State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing China

The permanent magnet assisted synchronous reluctance (SR-PM) machine can not only offer higher torque capacity and improved power factors compared with the conventional synchronous reluctance machine, but also own wider adjustable speed range compared with the permanent magnet machine. This paper presents a new method to optimize the key parameters of the machine under keeping the torque of the machine as large as possible by controlling the stator current. Nonlinear optimization and functional analysis are used to obtain the maximal torque at a certain speed. The investigation of many groups of the parameter data shows that the performance of a machine is influenced by various factors such as magnetic materials, the quantities of the material in the rotor, the turns of windings in the stator and so on. The best one should be chosen for applications. The trend of all the curves verifies the simulation results.

关键词： Reluctance machines Magnetic materials Permanent magnets Reactive power Permanent magnet machines Optimization methods Torque control Functional analysis Stator windings Machine windings

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Design and Experiments of Two Glued Axially-Laminated Synchronous Reluctance Permanent Magnetic Motors

Design and Experiments of Two Glued Axially-Laminated Synchr...

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International Conference on power Electronics and Drive systems (PEDS)

作者： Wei Guo Zhengming Zhao Department of Electrical Engineering State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China

Two axially-laminated glued axially-laminated synchronous reluctance permanent magnetic (SR-PM) motors are designed and tested. Compared to general axially-laminated synchronous reluctance (SR) motors, the steel bracket is replaced with iron lamination for reduction of iron loss in rotor. The axially-laminated iron and magnet are glued on the bracket with high strength cement with the help of special clamping device. Then the rotor is grinded to the cylinder and a stainless steel rotor sleeve is added to enhance the strength. The design flow starts with initial sizes trade-off and static performance analysis followed by high speed performance validation and dynamic operation simulations. The electromagnetic parameters measurement, no-load and load test are carried out on test bed to verify the design. The comparison of these two sample motors are given for future design reference. It can be concluded that very poor max energy product PM material is not a good choice for application that requires high power density

关键词： Permanent magnet motors Reluctance motors Synchronous motors Testing Iron Rotors Steel Strontium Lamination Magnetic devices

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simulation, Test and Analysis of Three-phase Short-Circuit Braking in IGCT-based MV Adjustable Speed Drive systems

Simulation, Test and Analysis of Three-phase Short-Circuit B...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Zhang Haitao Zhao Zhengming Yuan Liqiang Bai Hua State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing China

In the medium voltage adjustable speed drive (MV-ASD) systems, low switching frequency results in high harmonics in the output voltage waveform, which is harmful to the isolation of the induction motor. Therefore, the power filter is usually set between inverter and motor. However, self-excitation oscillation easily occurs under this structure due to the filter capacitor, which could continuously bring up the DC-link voltage of the inverter, and even destroy the devices in inverters. One of the effective ways to eliminate the self-excitation oscillation is to set the inverter to three-phase short-circuit braking state, which is described and analyzed in detail in this paper. Three-phase short-circuit braking could be easily realized in the inverter-motor system. It can be verified by both simulation based on PSIM and test results that this is an efficient way in real applications. Finally, the characteristics of the short-circuit braking is summarized and beneficial suggestions on using this braking method are presented

关键词： Analytical models System testing Variable speed drives Inverters power harmonic filters Medium voltage Switching frequency Induction motors power filters Capacitors

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A novel fiber-CAN-based real time communication system for MV-ASD systems

A novel fiber-CAN-based real time communication system for M...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Jue Qian Zhengming Zhao Haitao Zhang Hua Bai Liqiang Yuan Department of Electrical Engineering and Applied Electronic Technology State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China

The voltage increment in MV-ASD systems deteriorates the electromagnetic environment, therefore the communication system is facing a formidable challenge in the attempt to achieve the numerous real-time interactivities among those subsystems under such electromagnetic circumstance. This paper focuses on the real-time communication system for the MV-ASD systems, in which electromagnetic compatibility (EMC), real-time performance and system reliability are considered simultaneously. A novel fiber-CAN network is designed and implemented, which remarkably increases EMC compared to the conventional ones. The CAN system that serves in the multiprocessor control system for the MV-ASD system with the rated power of 1 MW is implemented. From the experiment results in the MV-ASD system with a 690 kW motor, it can be verified that the requests of timing performance and the reliability for the communication system are well accomplished

关键词： Optical fiber communication Real time systems control systems Communication system control Circuits Torque control Electromagnetic compatibility Pulse width modulation inverters Optical fiber devices power system simulation

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Accurate flux observer based on distributed multi-processor in MV adjustable speed drive system

Accurate flux observer based on distributed multi-processor ...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Liu Shu Liu Jianzheng Zhao Zhengming Yuan Liqiang Bai Hua Zhang Haitao Department of Electrical Engineering and Applied Electronic Technology State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China

This paper presents an accurate flux observer used in distributed multi-processor (DMP) adjustable speed drive systems. The stator flux linkage is estimated with a full-order observer, while the rotor speed is identified by using Lyapunov theorem. In order to improve the system performance in a wide speed range, the stator resistance is estimated simultaneously. In this paper, the structure of the DMP system, the principle of the full-order observer and the method for identifying the rotor speed and state resistance are all described in details. Relevant simulation results based on MATLAB/SIMULINK are given to prove the performance of the method. Experiments of a real system also verify the feasibility of this scheme

关键词： Variable speed drives Stators Observers control systems Mathematical model Couplings Torque control Optimal control Sampling methods Pulse width modulation

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Aging effect of UV radiation on SIR insulators' hydrophobicity property

Aging effect of UV radiation on SIR insulators' hydrophobici...

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Conference on Electrical Insulation and Dielectric Phenomena, (CEIDP)

作者： Xun Wang Xidong Liang Yuanxiang Zhou State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing China

ISBN: (纸本)0780385845

Based on the simulation of ultraviolet (UV) radiation in the Sun's rays and in corona, the aging effect of UV radiation on composite insulators was studied in this paper, especially the effect on hydrophobicity properties. It is found that after irradiation with UV, no matter whether a short time of less than 24 hours or a long time of 2000 hours, the hydrophobicity and the hydrophobicity transfer properties of silicone rubber (SIR), which are described by contact angle, slowly turns better. Four different kinds of samples with different prescriptions were used in the test. As UV sources, a special setup to simulate the UV rays of corona and a xenon light to simulate the sunlight were both used. The change of rigidity of silicone rubber was also measured. Infrared spectra of the silicone rubber surface, irradiated by UV for various times, show that the content of the low molecule weight on the surface is different, and this can be due to the discrepancy of hydrophobicity properties of the samples.

关键词： Aging Testing Slabs Xenon Corona Rubber power system simulation Surface cleaning Dielectrics and electrical insulation Stress

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Influence of annealing method on the space charge properties in polyethylene

Influence of annealing method on the space charge properties...

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Conference on Electrical Insulation and Dielectric Phenomena, (CEIDP)

作者： Ninghua Wang Yuanxiang Zhou Hongbin Liu Bin Gao Xidong Liang Zhicheng Guan T. Takada State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China Electronic Measurement Laboratory Musashi Institute of Technology Tokyo Japan

In this paper, high-density polyethylene (HDPE) films were prepared by three kinds of annealing methods which were different in cooling speed. The crystallinity of those HDPE samples were measured and compared. A high DC voltage was applied to the samples and the space charge formed was measured. Homo-charges were found in samples that were applied with a negative high voltage. The space charge properties were discussed, based on crystallinity. From these results, it is found that the space charge formed in samples cooled at high speed is more than that of the samples cooled at normal and low speed.

关键词： Annealing Space charge Polyethylene Voltage Current measurement Charge measurement Conducting materials Crystallization Morphology Laboratories

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Extended load-flow arithmetic for voltage stability analysis

Extended load-flow arithmetic for voltage stability analysis

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International Conference on power System Technology (powerCON)

作者： L. Zhu S. Zhou Y. Zhang State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing China

ISBN: (纸本)0780363388

In this paper, a novel load-flow arithmetic for voltage stability analysis is studied where models of various dynamic elements in power systems are taken into account. It simultaneously solves the load flow equation and the state equation of dynamic elements and gets both the voltage amplitude, phase of all buses and the inner state variables of the dynamic elements. In this arithmetic different limits are considered and the assumption of PV bus, PQ bus and slack bus are eliminated, so the result is closer to the real operation condition. Using a flow arithmetic based on continuation-power-flow (CPF) method, the critical point of voltage stability of the system can be computed. The proposed method is demonstrated on a test system and the results are compared with the conventional power flow method.

关键词： Arithmetic Voltage Stability analysis power system dynamics power system modeling Load flow Equations power system analysis computing power system stability System testing

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Digital power system

Digital power system

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World Congress on Intelligent control and Automation (WCICA)

作者： Lu Qiang State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments China

The concept of a digital power system (DPS) is set forth in the paper. The definition, the contents, the function, the hardware and the software conditions for implementing it are discussed. Moreover, the necessary basic research work for implementing a DPS is also discussed. The DPS may be defined like this: the digital power system is the digital, figuration and real time description and reappearance of physical structure, technical characteristic, management system as well as personal information system of a real power system which is in operation. The DPS will be able to make a significant contribution to administrating and decision-making more scientifically, improving security and stability online, online making and implementing economical operation strategy and carrying out emergency and anti-fault control, etc.

关键词： power system control

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Analysis of the toroidal HVDC grounding systems in horizontal multilayer soils

Analysis of the toroidal HVDC grounding systems in horizonta...

引用

作者： Zou, J. Lui, Y.Q. Yuan, J.S. He, J.L. Cao, L. Lee, J. Chang, S. State Key Lab of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing 100084 China Electrical Environment and Transmission Group Korea Electrotechnology Research Institute Changwon 641600 Korea Republic of

A Fredholm integral equation of the first kind has been developed for analyzing the performance of the toroidal high-voltage direct current (HVDC) grounding system buried in the horizontal multilayer soil. The method of moment is used to solve the equations. The formulation of potential in the earth due to a circular current is proposed in closed form by means of conception of the complex resistivity and depth, which leads to the saving of the computational time greatly. The numerical results show the good agreements with those in other papers and the measured data. © 2006 IEEE.

关键词： Electric grounding

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