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.
偏置电压的大小、门脉冲宽度和周期的选择对后脉冲的消除起着关键的作用。
How to choose the bias voltage, the width and the period of the gated pulse is very important.
本文就项目管理方法、项目寿命周期、项目管理相关软件的选择和执行问题进行了简单讨论，以期对企业项目管理系统的建立起到一定参考作用。
The paper expounds the application of fixed assets geography information system in fixed assets management of electric power enterprise, and the support role of fixed assets life cycle management.
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