A detailed user-defined UD auxiliary frequency controller AFC model of HVDC has been developed based on Power System Analysis Software Package PSASP.
基于电力系统分析软件包p SASP，使用其用户自定义功能，建立了辅助频率控制模型。
Such a motor can not start, we must use another special auxiliary motor winding or so after the arrival of the appropriate frequency before it can be connected to AC.
此种电动机不能自己开动，必须用另一电动机或特殊辅助绕线使到达适当的频率后，始可接通交流电。
Based on the actuality that in China's printing industry equipment, the main drive mostly adjusts speed by variable frequency, but less usage in itss auxiliary function.
针对目前国内印刷行业设备中主传动已大量采用变频调速，而在其辅助功能上却很少的现状。
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