六相异步电机的绕组结构及其仿真研究

本文阐述了多相电机相数的定义和六相异步电机的绕组结构,建立了六相异步电机静止坐标系下的仿真模型,给出了用Matlab/Simulink实现的具体步骤.仿真结果表明该模型的有效性,为研究不同工况下,特别是缺相运行时六相异步电机的动态性能仿真奠定基础,并极易扩展到任意相交流电机的建模和仿真研究中.     

六相异步电机的绕组结构及其仿真研究

本文阐述了多相电机相数的定义和六相异步电机的绕组结构，建立了六相异步电机静止坐标系下的仿真模型，给出了用Matlab／Simulink实现的具体步骤。仿真结果表明该模型的有效性，为研究不同工况下，特别是缺相运行时六相异步电机的动态性能仿真奠定基础，并极易扩展到任意相交流电机的建模和仿真研究中。     

多相感应电机缺相故障建模及仿真

多相电机具有相冗余特性,发生故障后仍可缺相运行.为准确模拟电机缺相运行工况,提出一种多相电机缺相故障仿真模型,采用不降阶方式建立电机缺相模型,并重构故障后相绕组电压以满足故障相电流为零的条件,从而模拟电机缺相情况.基于MATLAB/Simulink对缺相模型进行仿真,研究了多相电机在不同缺相故障情况下的电流特性,并利用...     

十五相异步电机建模及稳态仿真研究

为研究变频供电多相异步电机的稳态性能,依据电机多回路理论,采用广义坐标变换矩阵,建立了正交坐标系下十五相(3组五相移12°)异步电机的数学模型。在分析归纳以三相和五相为单元的2类典型多相电机状态变量对称性的基础上,给出了十五相异步电机的稳态仿真算法。对方波变频供电五相和十五相(3组五相移12°)两台异步电机的定子电流、转子电流和电磁转矩进行了仿真计算和分析比较。仿真计算结果表明,方波供电时十五相电机稳态定子电流谐波含量高于五相电机,稳态转矩脉动和转子侧电流谐波含量低于五相电机。     

四相双电枢绕组分布电励磁双凸极电机短路故障研究

短路故障是一种较为严重的电机故障,研究电机在短路故障下运行特性对提高电机在特殊环境下的运行能力至关重要.本文提出了一种四相12/9极双电枢绕组分布电励磁双凸极电机,深入研究了其基本结构与工作原理.在此基础上通过有限元仿真研究电机在两种短路故障下的绕组电流、磁链和端电压等电磁特性,得出了短路电流产生的电枢反应对电机的影响...     

两相不对称电机矢量控制和直接转矩控制的比较

矢量控制与直接转矩控制是当前主要的两种电机变频调速控制方法,已在两相交流感应电机中得到了应用。分析了两相不对称电机矢量控制和直接转矩控制原理以及两相三桥臂逆变器的SVPWM实现方法：运用Matlab的Simulink建立了两相不对称交流感应电机矢量控制和直接转矩控制调速系统的仿真模型并对两种控制系统进行了仿真研究,给出了仿真波形,进行了特性比较.     

基于Maxwell3D二相混合式步进电机静态性能研究

混合式步进电机具有转子分段、结构轴向不对称的特点.在Maxwell 3D下建立了二相混合式步进电机的仿真模型,计算得到了二相混合式步进电机的磁场分布与定、转子齿槽相对位置之间的关系,比较了矩角特性曲线的解析结果和有限元结果,肯定了有限元计算结果的正确性和精确性,并进一步定量分析了绕组电感随着绕组电流的增大而减小、随转子位置的非正弦变化的规律.研究结果可以为二相混合式步进电机的控制系统设计和电机优化设计提供理论基础.     

两相不对称交流感应电机矢量控制的仿真研究

运用MATLAB/SIMULINK工具建立了两相不对称交流感应电机矢量控制调速系统的仿真模型;介绍了两相不对称电机矢量控制的基本原理和两相三桥臂逆变器的SVPWM工作原理。对两相不对称电机矢量控制调速系统进行仿真研究,给出了电机矢量控制调速的仿真实验波形。     

六相感应电机的无源性控制研究

无源性控制从能量的角度分析电机控制系统,具有形式简单、无奇异点、鲁棒性好等特点。对六相感应电机的无源性控制进行研究,得到六相感应电机的欧拉-拉格朗日(E-L)模型,证明六相感应电机E-L模型的无源性。在此基础上,利用无源性控制原理,设计六相感应电机的转矩控制器和转速控制器。在Sim-ulink环境下,进行六相感应电机无源性控制的动态仿真。仿真结果证明了基于此算法的六相感应电机控制系统能很好地跟踪速度给定,具有较好的动态与静态响应能力。     

船舶电力推进中十五相感应电机同轴运行及容错控制策略

同轴双十五相电机推进系统具有高可靠性、能容错运行、能驱动较重负载等优势,因此其在船舶电力推进中的应用具有重要意义。本文首先分析建立了十五相电机的数学模型,在此基础上建立了十五相感应电机和螺旋桨负载的仿真模型。通过广义派克变换矩阵的建立,设计了十五相电机转子磁场定向矢量控制策略,并结合同轴电机的转矩随动控制,得到了转矩随动矢量控制策略。分析了断相故障下十五相电机气隙磁场的变化,研究了切除对称分布定子相绕组的容错控制策略。通过Matlab/Simulink中的仿真模型,说明了同轴双十五相电机推进系统控制策略的有效性和容错控制策略的可行性。     

异步电动机定子绕组短路故障仿真研究

介绍了三相异步电机的一个新模型,该模型由原始的相轴线模型变换得到。运用该模型对定子绕组短路故障进行了仿真研究,通过对定子起动电流的频谱分析发现,定子绕组短路时,三次、五次、七次谐波增加较多。     

Improvements of numerical stability of electromagnetic transient simulation by use of phase‐domain synchronous machine models

The present paper proposes the use of a phase‐domain (abc frame) generator model in electromagnetic transient analysis instead of the conventional dq0‐domain generator model in order to improve numerical stability. The drawback of the conventional dq0‐domain machine model is that the prediction of a number of electrical variables as well as machine speed is needed in order to interface the circuit of a machine model with the rest of the power system network, and the prediction of these variables leads to numerical instability. In contrast, prediction of electrical variables is not needed in the proposed phase‐domain model. In this paper, the phase‐domain machine model is developed. The proposed model is validated by comparisons with an existing EMTP type‐59 machine model. The paper makes it clear that numerically stable solutions are obtained by using the proposed model even in cases where numerical instabilities occur when the existing type‐59 model is used. © 1999 Scripta Technica, Electr Eng Jpn, 128(3): 53–62, 1999     

基于改进静止频率响应试验的同步电机参数辨识

针对同步电机参数辨识问题,以全电流为状态变量,研究同步电机d、q轴磁链与定子电流及励磁电压的关系,建立电机的数学模型。通过分析静止频率响应试验曲线,获得不同频率下各测试参数的增益和相位,替换d、q轴电磁参数特性传递函数方程中的相关部分,简化电机数学模型及其状态空间方程。基于励磁和定子回路开路时电机状态的分析结果,改进数据处理过程,辨识电机参数,对比采用其它方法测取的结果,有较好的一致性,所提参数辨识方法的有效性得以验证。     

Rotor/Stator Internal Phase to Phase Fault Detection in Three-Phase Wound Rotor Induction Machines

Abstract

This paper presents a novel method based on Magnetic Equivalent Circuit (MEC) to model the wound rotor three-phase induction machine under healthy and faulty conditions. Different parameters of machine such as the number of poles, number of slots, winding configuration and dimension can be selected based on designed properties of a given machine. Internal phase to phase fault is also detected by stator current signature analysis in dq frame. Saturation effect is modeled by a tunable function as well as the core nonlinearity characteristic is considered. Finally, Finite Element Method (FEM) is used to evaluate the accuracy of the proposed MEC model. Short computational time of MEC method shows that this model is suitable for electrical machine modeling and analysis.     

考虑主磁路瞬态饱和时异步电机的仿真模型

根据考虑主磁路瞬态饱和时三相异步电机在(d，q)静止坐标系下的数学模型，利用MATLAB软件中的动态仿真工具Simulink建立了一个新的三相异步电机的瞬态仿真模型，通过实例仿真证明了该方法的有效性。     

Sensorless control of a linear reciprocating switched-reluctance electric machine

It is proposed to use a simple switched-reluctance electric machine that does not have windings or permanent magnets on a movable part to develop a linear reciprocating electric machine intended for use as an electric generator together with a free-piston internal-combustion engine. It is noted that one of the most difficult problems in the development of such a linear electric machine is the development of a control system. A sensorless control algorithm is considered. Information on the stator-phase inductance of the electric machine and its variation is used to determine the position of the movable part. For its estimation, probing voltage pulses of known duration are applied to the phase. The amplitude of the current pulses caused by them will be proportional to the phase inductance. A mathematical model of electromagnetic processes is used to test the efficiency of the proposed control algorithm and determine appropriate control parameters. Since stator phases have separate magnetic circuits and are not magnetically connected, the electromagnetic processes in each phase are considered independently. Model parameters are determined experimentally using an experimental prototype of the considered electric machine, for which the dependences of the phase flux linkage and the generated force on the phase current for different positions of the movable part are obtained. The results of the investigation of processes in the considered electric machine at different frequencies of the movable part are given. It is found that, at frequencies of the movable part close to the nominal frequency, the phase should be connected to the power supply even before the movable part reaches the extreme position. Control using probing pulses applied to the operating phase is impossible, because the level of these pulses does not reach the maximum value until the phase is switched on. In this case, it is necessary to use the probing pulses of another, nonoperating phase to determine the position of the movable part. Such an algorithm makes it possible to control a linear reciprocating switched-reluctance electric machine at both low and high frequencies of the movable part. The obtained results confirmed the correctness of the adopted approaches to the development of a sensorless control algorithm.     

Mathematical simulation and parameter determination of regulation of a linear electrical reciprocating machine

A linear switched-reluctance electrical machine (LEM) intended to be used as an electric-power generator together with a free-piston internal-combustion engine (ICE) has been analyzed. Taking into account the hard service conditions of an electrical machine (EM) in close proximity to a cylinder ICE, hottemperature zones and heavy mechanical loads of the EM of the vent-inductor type have been recommended to be used. Development of a control system for this type of machine is one of the most complicated problems when developing it. It has been suggested to determine the reasonable principles and regulating algorithms of the machine that is being considered, as well as its regulation system and energy-data evaluation, on the basis of a model of the electromagnetic process. Taking into account the characteristic properties of the linear switched-reluctance machine as a modeling object, a mathematical model has been developed to solve the problems mentioned above. As stator phases have separate coil-flux guides and are not connected magnetically, the electromagnetic processes in each phase are analyzed independently. For experimental corroboration of ideas for design calculation, an experimental model of the machine has been constructed. Parameters required for modeling the characteristics’ correspondences of flux linkage and phase current’s generating force at various positions of a moving element have been determined for this machine experimentally. Performance of the linear switched reluctance electrical reciprocating machine has been analyzed with the mathematical model with moving-element movement frequencies unfeasible for study on a proving stand. Reasonable parameters of the current pulses’ phases of the machine have been determined, and its energy data have been evaluated. The obtained results have confirmed the correctness of the design approaches, choice of regulation principles, and adjustment of a linear vent-inductor electrical machine of forward and backward action and the feasibility of using it as an electric-power generator together with a free-piston ICE.     

基于混沌理论和支持向量机的电价预测

根据电价时间序列的混沌特性,结合混沌理论和支持向量机方法提出了一种新的电价预测模型。该模型基于混沌理论对电价时间序列进行相空间重构,并根据相空间演变规律确定模型的输入输出结构,然后采用支持向量机拟合相点演化的非线性关系。为增强模型的泛化推理能力,训练样本按照预测相点最近邻点原理选择。对美国PJM电力市场边际电价历史数据的仿真研究表明,文中提出的预测模型能有效、稳定地提高电价预测精度。     

A Voltage-Behind-Reactance Synchronous Machine Model for the EMTP-Type Solution

A full-order, voltage-behind-reactance synchronous machine model has recently been proposed in the literature. This paper extends the voltage-behind-reactance formulation for the electromagnetic transient program (EMTP)-type solution, in which the rotor subsystem is expressed in qd coordinates and the stator subsystem is expressed in abc phase coordinates. The model interface with the nodal-analysis network solution is non-iterative and simultaneous. An example of a single-machine, infinite-bus system shows that the proposed model is more accurate and efficient than several existing EMTP machine models     

单相永磁同步电动机动态性能的仿真

本文基于Maxwell2D仿真环境,建立了单相永磁同步电动机(SPPMSM)的仿真模型。对该电动机的动态性能进行了仿真研究,得到了电流、反电动势等曲线,结果有助于进一步研究单相永磁同步电动机。