可控硅变流设备谐波分析及其容量与系统短路容量配合问题的探讨

The Analysis of Harmonics from Power Converters and an Approach to the Relationship between System Short Capacity and Converter Power

本文对工业上广泛应用的可控硅变流设备所产生的谐波作了较系统的分析;从母线电压波形畸变的角度,探讨了交流设备的功率和系统短路容量的配合关系。文章在计算了6脉波单桥变流器和12脉波双桥变流器的谐波电压并确定了它们的相位关系之后,导出等值线性谐波网络。建立了用短路比S.C.R.和控制角α表示的母线电压波形畸变因数DF的关系式,并利用电子计算机计算和绘制了便于在工程设计中实际应用的曲线。

In this paper, the higher harmonics generated in power converterswhich have found wide application in industry are analysed in a systematic way.The relationship between system short capacity and converter power is investigeted,so far as the distortion of the bus voltage is concerned. Firstly, computation ofthe harmonic-voltage for the case of one and two-bridge circuit are given, thephases displaced from each other are also established, then the equivalent linearharmonic-networks for both kinds of circuit are derived. On the basic, taking S. C.R. and control angle a as independent variables, equations for the computation ofdistortion factor of bus voltage waveform are developed. In the meantime, thedistortion factors of bus voltage waveform against S. C. R. and α are plotted incurves, with an electronic microcomputer, in order to facilitate its use in engineeringdesign.