System Reduced DC Voltage and Restart Sequence Analysis for Repeated Line Faults on VSC HVDC Transmission System

High Voltage Direct current transmission plays a major role in reliable power transmission for long distances. HVDC Plus and HVDC Light are the two prominent power transmission systems in DC technologies. This paper mainly focuses on reduction of power transmission capacity and their grid diturbances for the multiple line faults with in a particular period of time. The complete study was done as a test protocal for the project PK-2000, a HVDC link in India between the Pugalur station in Tamil Nadu state to Thissur station in Kerala state. The project facilitates the power transmission capability of 2000MW between stations. Multiple line faults, the system behavior and reduced voltage principles, effect on power transmission were mentioned. Because of multiple line faults with in a period, the system will go to DC voltage reduced mode and transmission system coupled state to de-coupled state. The reduced DC voltage mode effects the active power transmission capacity and reactive power transmission capacity in the system at both the stations. The active power and reactive power disturbances and power transmsion disturbaces between the stations mentioned.