Differential ROCOF relay for Loss-of-Mains protection of Renewable Generation using phasor measurement over Internet Protocol

Renewable generation typically falls into the category of embedded generation subject to loss-of-mains protection requirements. Loss-of-mains protection is intended to avoid out of synchronism connection of an operating embedded generator to the utility supply after restoration of a fault. Present day technologies, such as ROCOF and Vector Shift are widely known to suffer from nuisance tripping and mal-operation caused by system-wide disturbances. This paper examines the use of modern day technologies to provide enhanced Loss-of-Mains protection using synchrophasor measurements delivered over Internet Protocol telecommunications. It will be shown that such a technique reduces the impact of nuisance tripping and allows embedded generation to ride through faults.