当我们开始与库交流时，我们调用一个名为 newsession 的函数，它会返回一个空指针（这是组织事情的惯用方法）。
When we start talking to the library about something, we call a function called newsession that returns a void pointer (not an unusual way to organize things).
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。
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.
补数键控的新版本为你的工具箱增加电容器、感应器和交流电压源！现在你可以画出和时间形成函数关系的电流和电压。
This new version of the CCK adds capacitors, inductors and ac voltage sources to your toolbox! Now you can graph the current and voltage as a function of time.
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