## 1 Introduction
In References [12] and [13], the current amplitude of IBDGs was controlled below the predefined value during a fault. In Reference [14], the current amplitude of IBDGs was reduced in proportion to the voltage sag at the point of common coupling (PCC). In addition to the current amplitude, the solution in Reference [15] was to adjust the current phase angle of IBDGs (\(\theta_{IBDG}\)), and the solution in Reference [16] changed the current phase angle of the IBMG. When the current phase angle was tuned toward the calculated result, the total fault current amplitude was reduced to the grid current amplitude. Thus, the protective devices were not affected by the fault current contribution of IBDGs and the IBMG. Although the solutions in References [12; 13; 14; 15] can alleviate the effects of fault current contributions from IBDGs, they become ineffective when an SDG exists in the power system. They are designed in the absence of an SDG. Likewise, the solution in Reference [16] suffers from the same problem because it can neutralize only fault currents from an IBMG. The SDG contributes to fault currents around 4-5 times their rated currents [17]. Thus, this is considered to be a major cause of protective device miscoordination. The solution of adding a fixed \(\Delta\) into the current phase angle of IBDGs was introduced to remove the effects of the fault current contribution from an SDG [18]. The fixed \(\Delta\) is comparable to the additional phase shift. The current phase angle added by the fixed \(\Delta\) produces a current gap between the grid current and total fault current. This current gap compensates for the fault current contribution from an SDG. Unfortunately, the fault current from an SDG (\(I_{SDG}\)) is unpredictable, since it depends on fault types, impedances, and locations. The use of a fixed \(\Delta\), therefore, does not always provide the proper current phase angle for generating the current gap. The current gap createdby an improper current phase angle is not efficient in compensating for the fault current contribution from an SDG. To improve the improper current phase angle caused by the fixed \(\Delta\), a modified current phase angle calculation was presented without the fixed \(\Delta\)[19]. The current phase angle was calculated by considering the fault currents from an SDG. Consequently, it can prepare an appropriate current phase angle that varies with unpredictable fault currents from an SDG. This solution is attractive, but even so, its development is still preliminary. Only symmetrical faults have been studied. Moreover, DC-link voltage (\(V_{dc}\)) variation has not been considered. The current reference is determined regardless of \(V_{dc}\). When excessive \(V_{dc}\) occurs, the IBDGs are disconnected from the grid [20]. The IBDGs thus fail to eliminate the effects of fault current contribution from SDGs on protective device coordination. The time delay caused by phasor measurement units (PMUs) in advanced metering systems is also neglected. This delay can degrade the performance of the modified current phase angle calculation. The contribution of this paper is twofold. First, our proposed separated phase-current control simultaneously adjusts the IBDG current phase angle in the faulty phase to maintain the designed recloser-fuse coordination. The adjusted current phase angle in the faulty phase can reduce the total fault current to the same level as the grid current without any further complications. The main difference between this work and what was done in Reference [18] is that the current phase angle is adjustable based on the estimated fault current from the SDG. The effects of the fault current contribution from the SDG on the recloser-fuse coordination are successfully removed. Second, the necessary amount of active and reactive currents is evaluated and injected into the nonfaulty phase to prevent an excessive \(V_{dc}\) rise in the IBDG and grid voltage variation.