VSI-based series compensation scheme for transmission lines

This paper addresses the loadability of long transmission lines. An advance d series compensation scheme is presented consisting of a series-connected voltage-sourced inverter and fixed series-capacitors. This scheme provides substantial increase of the line loadability beyond that achievable with fi xed capacitive compensation alone. In addition, it provides smooth power-fl ow control. Results from simulation studies demonstrate its effectiveness i n improving the loadability of long transmission lines and providing dampin g of interarea oscillations.