Based on the information points located in the distribution network

the load zone units aroundthe certain load bus and the source zone units around the distribution generator（DG）are defined. Andthen the regions merging algorithm is programmed according to the sequence of voltage stability marginindex of load buses

in which the index can conduct the priority trend of the merging operation of loadunits. Finally

the island partition zones will be product with the better voltage stability. The IEEE-33 bus system with single fault and multi-faults is used as the benchmark and the results of island partitionzones confirm the feasibility and the validity of the above method. After that

from the engineering view

the unbalanced load flow calculations are carried out. According the above calculation results

the splitphase compensation and distribution location measures by means of installation of single phase PV panelsare implemented

and then the voltage magnitude and the three-phase voltage unbalance factor can bepulled to the reasonable range. So the island partition scheme is valuable for the practical grid operators.