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。
Based on the Back-to-Back Project for the Northwest and Central China Connection, This report studies the harmonics and ac filter at ac side in the HVDC converter station.
本论文以西北—华中联网背靠背直流换流站工程为基础，进行换流站交流侧谐波和交流滤波器的研究。
To investigate the difference of central corneal thickness(CCT) measured by optical coherence tomography(OCT), anterior chamber-optical coherence tomography(AC-OCT), and compare their repeatability.
探讨眼前段光学相干断层扫描仪（AC-OCT）测量中央角膜厚度（CCT），并与光学相干断层扫描仪（OCT）进行比较。
Last season Park performed a typically selfless role, either out wide or in central midfield, where he impressed as a destructive man-marker against AC Milan and Liverpool.
上赛季他扮演了重要角色，不管在边路还是中路都有好的表现。特别是对AC米兰和利物浦的比赛中是决定比赛的球员。
In addition, it has communication function that can realize central control in the cab to ac units of the full train and show operation information of ac units in each car.
另外，还具有通讯功能，在列车司机室进行全列车空调机组的集中控制，了解各车辆空调机组的工作信息。
The system characteristics of main converter drive control unit of Central China Star AC drive EMUs is described. Thehardware and software functions are introduced in details.
阐述了“中原之星”号交流传动电动车组主变流器传动控制单元的系统特点，并对其硬件功能和软件功能做了详细的介绍。
The system characteristics of main converter drive control unit of Central China Star AC drive EMUs is described. Thehardware and software functions are introduced in details.
阐述了“中原之星”号交流传动电动车组主变流器传动控制单元的系统特点，并对其硬件功能和软件功能做了详细的介绍。
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