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Instantaneous energy balancing in three-level neutral point clamped converters

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

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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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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

2008 IEEE Vehicle power and Propulsion Conference, VPPC 2008

作者： Wang, Shuping Zhao, Zhengming Yuan, Liqiang Wang, Buyao 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 Corporation Company Ltd. Department of XiangTan Electric Machine Xiangtan China

ISBN: (纸本)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. © 2008 IEEE.

关键词： Finite element method

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Fast assessment of regional voltage stability based on WAMS

Fast assessment of regional voltage stability based on WAMS

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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

引用

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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Visualization tool for transient stability monitoring of bulk power systems based on DSR

Visualization tool for transient stability monitoring of bul...

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IEEE Asia-Pacific Conference on Circuits and systems

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

Dynamic security region (DSR) gives power system engineers systematic and global information about the feasible operation region. This paper is a result of an investigation into the use of DSR concept and its effective application in bulk power systems. It particularly concerns with developing a software-based tool for the transient stability monitoring in the on-line operation environment. A practical DSR solving method based on massively parallel computer clusters is described, and a new software package, named power system dynamic security region (PSDSR) is developed. Following a brief discussion about the main requirements, the paper gives a summary of the development of PSDSR from both the software architecture and the function implementation. A most distinctive character, the practical application in monitoring the cut-set power flows, with result visualization is emphasized.

关键词： power system transients power system stability Visualization Monitoring power system security power system dynamics Application software Information security power engineering and energy systems engineering and theory

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A torque ripple suppression circuit for brushless DC motors based on power DC/DC converters

A torque ripple suppression circuit for brushless DC motors ...

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Wei Chen Changliang Xia Mei Xue Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University TJU Tianjin China

This paper demonstrates a method of using a DC-DC boost conversion circuit to suppress the commutation torque ripple of a brushless DC (BLDC) motor with rectangular flux distribution. The commutation torque of a BLDC motor is depending on the commutation transient line current. To calculate the line current accurately, the phase resistance is taken into account, and the phase currents rising and falling speed are compared. Furthermore, it is proved that the line current will maintain constant if the DC voltage is lifted in the commutation period. The desired voltage is even higher than the supplied DC link voltage, if the back EMF is higher than two fifths of the input DC voltage. A super-lift Luo-converter is employed to increase the input voltage. The required waveform of the transient voltage is accomplished by changing the parameters of the power DC/DC converter based on the mathematical modeling for the proposed circuit. And the torque ripple is under control. The control stratagem for the torque ripple suppression is described in the paper and its reliability is testified by the simulation and experiment results.

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Interface control based on power flow tracing and generator re-dispatching

Interface control based on power flow tracing and generator ...

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IEEE Asia-Pacific Conference on Circuits and systems

作者： Yu Xiaodan Jia Hongjie Zhao Jing Wei Wei Li Yan Zeng Yuan Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University TJU Tianjin China

In recent years, economical and environmental reasons have forced the transmission systems to be operated closer to their security limits. power utilities world-wide have become even more concerned with various power system stability problems. In this paper, we mainly concern power flow control strategy on some system critical interfaces. A control method based on power flow tracing and generator re-dispatching is presented. It can effectively control the power flow on some critical interfaces in a relatively large range. power flow on the interface is first traced backward to locate generators to be adjusted in the sending-end subsystem. And then, it is traced forward to determine loads to be affected. power flow tracing is adopted again from such loads to determine their supplying generators in the receiving-end subsystem, which is then used to compensate the load fluctuation on the interface. Since power flow tracing is mainly used in the congestion management, power loss allocation, node pricing in deregulation study, the presented method can not only be used in the traditional and monopolistic environment to enhance power system stability, but also can be used to mitigate power system congestion under deregulation environment. Finally, New England 39-bus system, 57-bus system and 118 bus system are employed to verify the effectiveness of the presented method.

关键词： Load flow power generation power system stability power system management power system economics power generation economics Environmental economics power system security Load flow control Fluctuations

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The static characteristics of DSPM under different armature current and different PM thickness

The static characteristics of DSPM under different armature ...

引用

International Conference on Electrical Machines, ICEM

作者： Xiaoyuan Wang Chuan Wang Zhi Guo Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University TJU Tianjin China

In this paper, on the base of comparing with switched reluctance motor (SRM), a new doubly salient permanent-magnet machine (DSPM) and its structure and running principle were introduced. Because of the high nonlinearities of the DSPM motor, the finite element method (FEM) was adopted to analyze the static characteristics under different armature currents and different thickness of permanent-magnet (PM). The relationship between torque ripple and PM width was pointed out, and the structure parameters under the condition of the smallest torque ripple were computed. Some advices were given for DSPM motor design.

关键词： Reluctance motors Torque Inductance Permanent magnet motors Rotors Reluctance machines Magnetic fields Magnetic materials Stator cores Magnetic flux

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Modular stator structure permanent magnet synchronous machine

Modular stator structure permanent magnet synchronous machin...

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Proceedings of the Biannual World Automation Congress

作者： Yiguang Chen Zhiming Du Weigang Zhong Lingbin Kong Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University TJU Tianjin China

A new type of three-phase permanent magnet synchronous machine (PMSM) with modular stator structure is proposed. Its structure and principle is introduced. The machinepsilas teeth width is equal to polar pitch, its stator winding is concentrated winding, each phase winding is wound up continuously and the ends of windings are shorter then conventional machines. Therefore, the machinepsilas efficiency is increased and mass is reduced proportionally. The relation between structure parameter and pole number is discussed. It is also approved that only the 3rd and integral times of 3rd cogging torque is existed and the others are eliminated. A 22-pole prototype machine, of which magnets are mounted on the rotor surface (is equipped with surface-mounted magnet rotor), is analyzed by finite element method, and calculated result proved that phased inductive electromotive force(EMF) wave of three phase stator winding is shape of trapezoid, and the top flat waveband of EMF approaches to 2pi/3 electrical angle. And the prototype machine, in term of brushless direct current motor (BLDCM), is analyzed and correlative result is discussed when it is at full load. This kind of permanent magnet synchronous machine with new stator structure is especially suitable for the field of low speed BLDCM and direct driven wind turbine with PMSM.

关键词： Permanent magnet machines Stator windings Machine windings Prototypes Surface waves Magnetic analysis Teeth Wounds Forging Torque

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