In allusion to the application limitations of micro-grid in the domain with high-quality power of electric power equipment testing laboratory as the case study

we presented a series micro-grid access structure with distributed generation distributed generation（DG）

and proposed a power factor/frequency inverse droop control method to reduce power distribution error and improve voltage instability.The results show that the series micro-grid and inverse droop control method can realize the equipartition of active and reactive power between DG units

and reduce power distribution error; voltage waves of DG units can be synchronized to resolve the power mismatch caused by the phase angle difference of DG units

and improve the voltage amplitude of point of common coupling（PCC） and the voltage instability.The research results show that the access structure and power control algorithm of specialized micro-grid can provide the electromagnetic compatibility laboratory for micro-grid generation with accurate power control and voltage instability

and this supply can meet the test requirements of electric power equipment testing laboratory.