With the battery in the power supply during the gradual reduction in the voltage is gradually reduced, will affect the AC output voltage amplitude changes.
在供电过程中随着蓄电池电量的逐渐减少，其电压也逐渐降低，将影响到交流输出电压幅值的变化。
By getting the direction function from the output AC current, the applied time of voltage vectors in one PWM period was chosen, the direction of central current was controlled for DC voltage balance.
该方法通过实时检测三相交流输出电流方向得到方向函数，利用该函数选择一个PWM周期内不同电压矢量作用时间来控制中点电流的方向，实现电压平衡。
We design a suit of aviation AC excitation generator system, it insures the output voltage is constant frequency and constant voltage.
我们设计了一套航空用交流励磁发电机系统，以保证输出电压恒频恒压。
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