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。
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