Sizing and Short-Circuit Capability of a Transformerless HVDC DC-DC Converter
Vidal-Albalate, Ricardo
Universitat Jaume I
Belenguer, Enrique
Universitat Jaume I
Pena, Ruben
Universidad de Concepcion
Blasco-Gimenez, Ramon
Universitat Politecnica de Valencia
Journal
IEEE Transactions on Power Delivery
ISSN
0885-8977
1937-4208
Open Access
green
Volume
35
Start page
2363
End page
2377
This work aims at optimizing the converter design of the double-T MMC DC-DC converter in terms of transmitted power per submodule and also in terms of transmitted power per silicon area, while, at the same time, providing the capability to block dc faults. Firstly, the converter operation is described and the optimal values of the inner ac and dc voltages that minimize device power rating are derived. Next, the submodule topology is analyzed and a thorough study on the converter capability for blocking fault currents is carried out, showing that the converter is able to isolate dc faults both at the input and at the output of the converter. Finally, the previous analytical study is verified by means of detailed PSCAD simulations.