Unified power flow controller based on matrix converter

Recently, L. Gyugyi introduced the concept of the unified power flow controller (UPFC) in flexible AC transmission systems (FACTS). This paper shows that the voltage-source type matrix power converter cannot only fulfil the specifications of the UPFC but also surpass it on the following points: (1) the ability to link power systems at different frequency standards (60 Hz and 50 Hz); (2) 360° phase-shift range; and (3) high synchronizing power associated with series reactance compensation. This paper shows the modifications required to adapt the matrix power converter for UPFC application and presents experimental results which substantiate its capabilities