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Effects of inductance nonlinearities in a transformer-rectifier DC motor drive system on the AC side harmonic distortion using a time-stepping coupled finite element-circuit technique

机译:时分耦合有限元电路技术在变压器整流直流电动机驱动系统中的电感非线性对交流侧谐波畸变的影响

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The effects of the periodic nature of changes in the magnetic saturation in cores of transformers connected to rectifiers feeding DC motor type loads on performance of the AC side of the system are investigated. Performance issues pertaining to the AC side include harmonic contents of the AC current waveform and total harmonic distortion and their relationship to magnetic saturation effects in transformer cores, whose windings are connected to these rectifiers. The findings were obtained using the rigorous approach of time stepping coupled finite element-state space (TSCFE-SS) modeling and simulation technique, which couples the time-varying magnetic saturation conditions within cores of transformers to their external circuits. The results include TSCFE-SS simulation of the transformer-rectifier-DC-motor load and comparison to laboratory test results on a case study system. The system comprises a 1.5 kVA, 120/277 Volts transformer feeding a full-wave single-phase rectifier bridge which is supplying a 240 V, 7.75 A, 2-pole, separately excited DC motor. The simulation and test data confirm and quantify the significant impact of transformer time-variant core saturation on system currents and harmonic distortion.
机译:研究了与整流器相连的变压器铁芯的磁饱和度的周期性变化对整流器的影响,该整流器为直流电动机类型的负载供电,对系统交流侧的性能产生了影响。与交流侧有关的性能问题包括交流电流波形的谐波含量和总谐波失真,以及它们与变压器铁心的关系,变压器铁心的绕组连接到这些整流器。使用严格的时步耦合有限元状态空间(TSCFE-SS)建模和仿真技术,将变压器铁心内随时间变化的磁饱和条件耦合到其外部电路,从而获得了这些发现。结果包括变压器整流器-直流电动机负载的TSCFE-SS仿真,并与案例研究系统上的实验室测试结果进行比较。该系统包括一个1.5 kVA,120/277伏的变压器,为全波单相整流桥供电,该桥为240 V,7.75 A,两极,单独励磁的直流电动机供电。仿真和测试数据证实并量化了变压器时变铁心饱和度对系统电流和谐波失真的重大影响。

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