Protection and control of hybrid LCC-VSC multi-terminal HVDC transmission systems against DC faults

Two High Voltage DC (HVDC) transmission technologies, the mature Line Commutated Converter (LCC) and newer Voltage Source Converter (VSC) technologies have their own pros and cons. For a HVDC transmission system carrying power from a single generation center to multiple load centers, by using a multi-terminal LCC-VSC type hybrid HVDC configuration, advantages of both technologies can be exploited. There is also the possibility of tapping into existing point-to-point LCC transmission lines using this hybrid configuration to supply intermediate locations. Despite the apparent benefits, hybrid LCC-VSC multi-terminal topology is not well understood. Thus, this study aims to understand the DC side fault behavior of a hybrid LCC-VSC multi-terminal HVDC transmission system, and develop a satisfactory protection methodology that can retain high reliability. TO BE CONTD

Naushath Mohamed Haleem
Faculty Supervisor: 
Athula Rajapakse
Partner University: