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本文对可控硅串级调速系统采用自然换流方式与采用强迫换流超前导通方式下所产生的谐波电压和谐波电流进行了数学分析和比较。计算结果表明采用强迫换流超前导通方式的新型串级调速系统由于采用L—C换流环节,在换流过程中电容器充放电,在变压器次级引起额外的高次谐波电压分量,其最低次谐波为6次,幅值增加约15.9％Uem,加重了高次谐波对电网的污染是不容忽视。因此,文中还提出了相应的抑制高次谐波的途径。
In this paper, the mathematical analysis and comparison of the thyristor cascade speed control system using the natural commutation method and the harmonic voltage and harmonic current generated by the forced convection leading conduction mode. The calculation results show that the new cascade speed regulation system with forced convection advanced conduction mode charges and discharges the capacitor during the commutation due to the L-C commutation stage, which causes additional higher harmonic voltage components at the transformer secondary stage. The lowest harmonic is 6 times, the amplitude increases about 15.9% Uem, aggravating the higher harmonic pollution of the grid can not be ignored. Therefore, the paper also proposed a corresponding way to suppress higher harmonics.