A comparative analysis of the interaction between different FACTS and HVDC

SVC and TCSC, two different types of FACTS devices, play an important role in power systems. The interaction between SVC/TCSC and HVDC may impose negative influence on power systems. Taking IEEE 3-machine 9-bus AC/DC hybrid system as a test system, the relationship between connection type of FACTS and interaction is investigated, and the steady-state and dynamic relative gain array (RGA) methods are adopted to compare the interaction between TCSC (series type) and HVDC with that between SVC (parallel type) and HVDC in the different cases, such as changing electrical distance and DC transmission power. The sensitive frequency which occurs in the RGA peak value point is found. Results show that the interaction between FACTS and HVDC varies with electrical distance, DC transmission power and frequency, which can provide technical support for configuring FACTS devices.