中低速磁悬浮列车空心电抗器设计与研究

介绍中低速磁悬浮列车空心电抗器的研制过程,描述空心电抗器的技术要求,重点分析电抗器的电感计算、机械结构设计、温升及屏蔽板计算。运用了ANSOFT有限元软件对电抗器电磁场进行模拟分析,以达到国际非电离辐射标准要求。     

中低速磁悬浮列车悬浮电磁铁线圈电感计算

采用传统磁路方法和有限元数值计算方法,对中低速磁悬浮列车悬浮电磁铁线圈电感进行了研究,得到悬浮电磁铁电感随着悬浮气隙、电磁铁线圈电流和电磁铁滚动角度变化而动态变化,在悬浮供电电源和悬浮斩波器的设计中应重点考虑.     

RIGOROUS PROOF FOR CHARACTERISTICS OF PRACTICABLE MAGNETIC POTENTIOMETERS AND THEIR APPLICATION

IntroductionThe magnetic potentiometer or Rogowski coilhas been widely applied for measuring the heavyAC- current and pulsed current[1～ 3 ] . It has variousadvantages among which the following are of vitalimportance:1 The relation between the inducedoutput voltage in secondary winding and the differ-ential of the primary currents is exactly linear;2The output voltage is independent of the positionof the primary circuit;3 The outputvoltage is un-affected by stray fields of the current which …     

并联有源电力滤波器补偿性能的研究

研究了影响桥式整流带阻感型负载的并联型有源电力滤波器补偿性能的因素,从理论上分析指令延时和母线电压以及输出电感对补偿效果影响的具体原因,并通过Matlab软件建立仿真模型,借助仿真波形和THD数据证明了理论分析的正确性,最后根据实际工程需要合理优化了各个参数,并在一台50 KVA三相四线的并联电力有源滤波器样机上验证了该方法的实用性和有效性.     

消磁工作线圈电流对纵向补偿的干扰研究

从现行消磁工作线圈电流对纵向补偿效果产生较大干扰的事实出发,研究其干扰程度。计算得到相关消磁线圈电感,利用法拉第电磁感应定律具体计算了在工作线圈电流首脉冲换向过程中纵向补偿线圈感应电流的大小。进而提出降低干扰的改进方案,通过科学计算及仿真分析检验了方案效果。研究结果表明改进方案可行。     

On-line detecting of transformer winding deformation based on parameter identification of leakage inductance

Transformers are required to demonstrate the ability to withstand short circuit currents. Over currents caused by short circuit can give rise to windings deformation. In this paper, a novel method is proposed to monitor the state of transformer windings, which is achieved through on-line detecting the leakage inductance of the windings. Specifically, the mathematical model is established for on-line identifying the leakage inductance of the windings by applying least square algorithm （LSA） to the equivalent circuit equations. The effect of measurement and model inaccuracy on the identification error is analyzed, and the corrected model is also given to decrease these adverse effect on the results. Finally, dynamic test is carried out to verify our method. The test results clearly show that our method is very accurate even under the fluctuation of load or power factor. Therefore, our method can be effectively used to on-line detect the windings deformation.     

回转器在工业控制中的应用

回转器在自动控制、仪器仪表、信号变换以及传感器信号采集与处理等电路中实现大时间常数的一种新方法.根据近代电工理论中的回转器原理,利用运算放大器及其电阻、电容器件可以实现模拟电感,给出了理论计算和应用实例.     

磁场饱和与畸变对发电机电感参数计算的影响

为了提高发电机故障检测的灵敏性,需要准确计算发电机电感参数.考虑发电机负载运行时磁路的饱和与位置的畸变,分别应用磁路法和磁场法计算了不同饱和程度与畸变程度下的电感参数,讨论了磁路饱和与磁场畸变对电感参数的影响,指出磁路法计算电感参数的局限性.对一台一对极隐极式发电机样机进行的不同工况下转子匝间短路实验表明：磁场法可以充分考虑物理情况,参数计算结果更加准确.在要求准确计算电感参数的场合使用磁场法更合适.     

电动汽车无线充电原理分析

就一款主、副边互感线圈均为串联谐振感应耦合的电动汽车无线充电原理电路进行了深入分析,经对电动汽车的蓄电池电压与输入交流电源电压之比的优化,得出了它在稳态工作时电路的输出功率、传输效率与电路参数的关系,并得到了与互感线圈对应的补偿电容上的电压与输入交流电源电压、蓄电池电压及互感线圈互感量间的关系。通过仿真,对以上结果进行了验证,此结果可以为电动汽车在行进中充电打下基础。     

移动电站测试中感性负载的控制

介绍了通过开发的控制平台,利用RS232协议,通过PLC来控制可调电抗器上的伺服电机旋转,从而调节电抗器内部电感值的变化,满足对不同功率、电压等级下感性负载的测试要求。