Why can dc transmission lines only transmit active power

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Reference no: EM131367355

1. Can we contemplate Id < 0 when V2d > V1d in (5.1)? Why?

2. Why can DC transmission lines only transmit active power, but the converters absorb reactive power from the AC system?

3. What is the physical significance of phase-shifter resistance Rg in (5.21)?

Reference no: EM131367355

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