因此，对于主从控制模式，文献研究主要集中于如何补偿、矫正时钟失步，进而

Therefore, for the master-slave control mode, the literature research mainly focuses on how to compensate and correct the clock out-of-step, and then eliminate the low-frequency zero-sequence circulating current. <br>26 It <br>should be pointed out that since both converters use the same carrier and the equivalent switching frequency of the parallel system is the same as that of a single converter, the quality of the AC current output by the system cannot be further improved by virtue of the parallel characteristic.

Therefore, for the master-slave control mode, the literature research mainly focuses on how to compensate and correct the clock out of step, so as to eliminate the low-frequency zero sequence circulation.<br>twenty-six<br>It should be pointed out that since both converters use the same carrier and the equivalent switching frequency of the parallel system is the same as that of a single converter, the AC current quality of the system output cannot be further improved by virtue of the parallel characteristics.

Therefore, for the master-slave control mode, literature research mainly focuses on how to compensate and correct the clock out-of-step, and then eliminate the low-frequency zero-sequence circulation. Twenty-six It should be pointed out that because both converters use the same carrier, the equivalent switching frequency of the parallel system is the same as that of a single converter, and the quality of AC current output by the system cannot be further improved by virtue of the parallel characteristics.