Addressing operational contingencies faced in parallel operation of ±800 kV 6000 MW Champa Kurukshetra HVDC link

High Voltage Direct Current (HVDC) systems are widely used in long-distance electric power transmission-networks. ±800 kV 6000 MW Champa Kurukshetra HVDC link is an important 1287 KM inter-regional transmission-link connecting Western region of India with Northern region. This inter-regional transmission link consists of-two Bipoles operating in parallel configuration with two HV conductors (one +800 kV and other -800 kV) and two-parallel DMR lines (Dedicated Metallic Return line provides return path to current during unbalance operation) on same Tower. Both the Bipoles of this project were awarded as separate packages and present significant technical complexities in their integration. Bipole 1 of this project was commissioned in 2017 while the Bipole 2 of this project got commissioned in 2020. This paper elaborates the major challenges faced in the operation-of this link from a utility perspective and the steps taken to address those issues. The major topics covered in this paper are listed below:

(1) Main Scheme Parameters of the Project

(2) Tap Hunting During Parallel Operation

(3) Criticality of Reliable Fast Communication between Parallel Poles

(4) Criticality of DC switchgear healthiness in Parallel Operation

(5) DMR Faut Location