3 ms·
I thought the advantage of HVDC was mostly for subterranean and undersea cables. Why would it be better above ground?
by sidewndr46 2y ago
I thought the advantage of HVDC was mostly for subterranean and undersea cables. Why would it be better above ground?
- fdfgyu 2y agoTwo major reasons: Capacitive losses. They're worse in water (dielectric), but they're there in air lines as well. Compatibility and isolation of grids. If grid A is 35 degrees from grid B it's very hard to couple them. Also, cascading failures tend not cross DC boundaries.
- bsder 2y agoHVDC advantages pertain irrespective of environment. HVDC only needs one copper conductor. HVDC has no reactive power loss. HVDC has less corona effect and self-inductance to overcome so conductors can be smaller. HVDC is not subject to grid phase problems. In addition, since HVDC cabling can be cheaper at a given voltage, the voltage can be increased which minimizes resistive losses (Ptrans = IV while Ploss =I^2R--if you double V you halve I which reduces your losses by a factor or 4).