1551–1556. Abstract: Unified energy flow controller UPFC is one engineering matlab most sophisticated bendy AC transmission equipment FACTS contraptions that can concurrently and independently manage both matlab real and reactive power flow in engineering transmission line. The utilization of UPFC can lead to enormous reliability merits in contemporary power programs. This paper proposes engineering novel reliability community brand for engineering UPFC, which contains matlab logical constitution and matlab distinct operating modes of engineering UPFC. Two state or three state fashions have been used for UPFC by outdated researchers. The proposed brand divides matlab UPFC working modes into four states, particularly matlab UPFC up state, STATCOM state, SSSC state and UPFC down state, in an effort to improve matlab accuracy engineering matlab model by spotting matlab useful operating states of engineering UPFC.