SLLA498 October   2020

 

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3.3 Bidirectional Inverter/ PFC Power Stage

The power stages used in the inverter power stage needs to be bidirectional in the storage ready inverter as it should be able to charge the battery when the situation demands it. However, there is no need for any special power topology to achieve this, as the inverter power stages commonly used in standard string inverters like two-level H-bridge, HERIC, three-level TNPC, three-level NPC, and three-level ANPC are all capable of bidirectional operation. The only difference will be in the firmware used for controlling these power stages to enable bi-directional operation.