Investigating the impact of embedded generation on relay settings of utilities electrical feeders

A novel adaptive current protection scheme for distribution systems with distributed generation

“…When a fault occurs in the transmission line CD, the measured current I pm3 in R3 can be calculated using (1)-(3) and the adaptive primary protection setting I ps3 of R3 can be obtained by using (4)-(10). In the same way, the measured current I bm2 in R2 can be achieved using (1)-(3) and the backup protection setting I bs2 of R2 can be calculated using (4)- (9) and (11). …”

“…The Eqs. (10) and (11) are programmed in the relays. And the settings are calculated by the relays rather than commanded by a control center.…”

“…The implementation of DG can create difficulties for the existing power system protection schemes and cause protection devices to operate incorrectly [9][10][11][12]. It is feasible for adaptive protection scheme to solve the problems that DG brings to the protection system.…”

Impact of Distribuion Generation on Protection Coordination

“…However, no malfunctioning of protection device has been reported due to incorporation of DGs. Salman et al [12] presented an investigation on the impact of the integration of embedded synchronous generators and embedded induction generators on the settings of protective devices installed on the distribution systems. It has been observed that the conventional distribution overcurrent protection schemes do not have sufficient capacity to protect radial distribution network with all possible configurations and operating conditions of DG.…”

Torsional vibration characteristic study of the grid-connected DFIG wind turbine

“…Thus, the oscillation mode 5 is also mechanical oscillation mode, and the oscillation frequency is 1.765 Hz. Since the number of natural frequencies of a multi-mass system are equal to the number of masses minus one [19], the drive train model in this paper has only two natural frequencies, which are 12.427 Hz and 1.765 Hz, and the oscillation mode 4 and 5 are the torsional modes.…”