HVDC system based on VSC technology built with IGBTs.

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The discussion focuses on the flow of reactive and real power in an HVDC system utilizing VSC technology with IGBTs. It clarifies that reactive power is indicated by the bidirectional arrows between AC1 and AC2, emphasizing its cyclical nature. The presence of a single bidirectional arrow at the transformer suggests that only reactive power is accounted for. A participant questions whether an additional bidirectional arrow can be added to represent real power flow, asserting that both reactive and real power should be considered. The conversation highlights the importance of accurately representing power flows in HVDC system diagrams.
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In the above fig the arrow indicates that just reactive power is following in and out from the AC1 & AC2. Does it mean that there is no real power follow from AC1 & AC2.
 

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Reactive power always flows out and back; they are just making it clear that it has to be accounted for.

The bidirectional arrow labeled real power indicates that real power may be drawn from AC 1 or 2.
 
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Hello! thanks for your response. Could you please answer to my following question?

There is only one bidirectional arrow at the transformer near AC1 & AC2 which indicates reactive power can follow in and out the transformer. Can I add one more bidirectional arrow at the transformer to represent real power follow? Because I think, not only reactive power but also real power is following in and out the transformer.
 
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