As backup power supply of the DC system, the residual capacity of battery effected safe operation of DC system directly when ac power failure occurs.
蓄电池作为直流系统交流停电时的后备电源，其剩余容量直接影响了直流系统的安全运行。
The BDFM is suitable to ac speed control system of great capacity besides working as VSCF generator.
无刷双馈电机除了可作为变速恒频发电机外，还特别适用于大容量的交流调速系统。
Recent years, multilevel inverter has been applied widely in the large-capacity electrical energy transformation of high-voltage and ac speed adjustable system.
近年来，多电平逆变器在高压大容量电能变换及交流电机调速中得到广泛应用。
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