A power system including a first grid and a second grid, each grid having power flow parameters. A breaker installed at a point of common coupling between the first grid and second grid. A first sensor and a second sensor, each located on a side of the point of the common coupling for continually determining the power flow parameters of the first grid and second grid. Wherein the power flow parameters for the first and second grid are indicative of a frequency and a phase. A power source for supplying power to either the first grid or second grid. A controller for synchronizing the frequencies and the phases of the first and second grid, by continually adjusting an amount of power supplied, based on continually determining a frequency mismatch and a phase mismatch between the first grid and second grid, until a first predetermined condition is met.