In a thermal power plant, the feed water coming to the economiser is heated using

Out of the considerations (i) to (iv) listed below,
(i) No distance limitation related to steady state stability
(ii) No reactive power requirement from the system at the two terminals
(iii) No substantial effect on fault level of the two systems at the terminals inspite of the inter connection
(iv) no corona problems
The considerations which constitute advantages of HVDC transmission are