PROJECT TITLE :

Optimized Control of LCL-VSC Converter with Refined s-Parameter - 2017

ABSTRACT:

For the management of high-voltage dc (HVdc) systems, especially for that of the multiterminal HVdc (MTdc) systems, the voltage source converter (VSC) could be a smart option because of its high controllability. These days, different types of VSC converters are realized like the two/3 level converter and modular multilevel converter. But, VSC converters are vulnerable against dc faults as a result of the paralleled diodes may experience massive fault currents. In order to maintain the sustainability of electricity delivery, efforts are paid on protecting the HVdc networks, like the novel converter topologies with the potential to tolerate faults and also the dc circuit breaker. Among that, the concept of the inductor-capacitor-inductor circuit (LCL)-VSC converter aims at enhancing the ability of converter to ride through dc faults, which limits currents flowing from the ac side to dc aspect. The proposed technique in this paper optimizes the management of LCL-VSC for partial load so that the ability loss will be drastically decreased. Yet, the preferable working range for the LCL converter is introduced to guarantee the ability of restraining fault currents. The method is verified on the PSCAD/EMTdc platform.