Abstract
The paper presents a fault tolerant scheme for integrating renewable energy sources to HVDC system using a new modular resonant DC-DC converter. The proposed DC-DC converter consists of many identical low voltage submodules which consist of two controllable switches, one diode and a capacitor. The switches of the proposed DC-DC converter are configured to provide the converter an inherent fault tolerant feature which enables it to isolate itself during DC faults in the HVDC system. Zero current switching (ZCS) is also achieved for all the switches used in the converter. The paper focusses on the integration of renewable energy sources to HVDC transmission system using the proposed tapping scheme. The performance of the proposed scheme to evacuate power from renewable energy sources to HVDC transmission system has been demonstrated using simulation studies done in PSCAD/EMTDC. The performance of the proposed DC-DC converter is also verified with experimental results.
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