Guan, Rui
(2018).
Stability control and protection of power systems with VSC HVDC and VSC FACTS.
University of Birmingham.
Ph.D.
Abstract
The recent progress of high-voltage high-power fully controlled semiconductor technology laid the foundation of VSC technology, which continues to advance the developments of HVDC technology and FACTS., However, the high penetration of VSC based systems may introduce certain risks to existing power systems in two primary aspects: dynamic stability and protection. This thesis investigates the impacts of VSC HVDC and VSC FACTS on system dynamic stability and protection. An integrated small-signal stability model for the study of interactions between CFC and VSC is established. Modal analysis results are verified by simulation results from RTDS under both small and large AC/DC disturbances. The impacts of control parameters of CFC on the integrated AC/DC system and the interactions between VSC and CFC are investigated using both modal analysis and time-domain simulations. The mathematical representation of the apparent impedance measurements of distance relay is derived considering the infeed current from VSC HVDC and VSC FACTS at different locations. A RTDS-based HIL testing platform is established. The impacts of VSC HVDC and VSC FACTS on feeder distance protection are investigated, based on different types of internal/external fault test simulation occurred at various locations.
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