Abstract
The UPFC, which is one of the many FACTS devices that are in use in the modem power system, is able to independently control the active and reactive power in the transmission systems by injecting a controlled voltage in series. The series injected voltage by the UPFC can be perceived as a change in transmission line impedance by existing distance protection relays and affect their correct operation. This paper first uses EMTDC models of the UPFC and surrounding power system of the Kangjin substation located in Jeonla-namdo province in Korea to investigate the impedance variation according to different UPFC operating conditions under steady and transient states. Then the operation of the UPFC protection controls, and impedance variations seen by the distance protection relay were reviewed under fault conditions to investigate the possibility of relay misoperation, and the need for relay protection setting modifications.
Published Version
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