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A method is provided for using a temporary power source to transfer a power bus from a first power source to a second power source. The first power source operates at a first electrical frequency, and the second power source operates at a second electrical frequency that is different from the first

A method is provided for using a temporary power source to transfer a power bus from a first power source to a second power source. The first power source operates at a first electrical frequency, and the second power source operates at a second electrical frequency that is different from the first electrical frequency. The method includes adjusting the output frequency of the temporary power source to match the first electrical frequency and supplying power to the power bus from the temporary power source. The method also includes disconnecting the first power source from the power bus. The method further includes adjusting the output frequency of the temporary power source to match the second electrical frequency. The method further includes coupling the second power source to the power bus.

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1. A method of transferring an electrical supply of a power bus from a first electrical generator operating at a first electrical frequency to a second electrical generator operating at a second electrical frequency different from the first electrical frequency, the method comprising: adjusting the

1. A method of transferring an electrical supply of a power bus from a first electrical generator operating at a first electrical frequency to a second electrical generator operating at a second electrical frequency different from the first electrical frequency, the method comprising: adjusting the output frequency of a temporary power source to substantially match the first electrical frequency;supplying power to the power bus from the temporary power source at the first electrical frequency;disconnecting the first electrical generator from the power bus;adjusting the output frequency of the temporary power source to substantially match the second electrical frequency; andcoupling the second electrical generator to the power bus. 2. A method according to claim 1, further comprising charging the temporary power source from the power bus. 3. A method according to claim 1, further comprising adjusting the output of the temporary power source such that a phase difference between the temporary power source and the second electrical generator is about zero degrees. 4. A method according to claim 1, wherein adjusting the output frequency of the temporary power source to match the second electrical frequency comprises adjusting the output frequency of the temporary power source from the first electrical frequency to the second electrical frequency in less than about 100 milliseconds. 5. A method according to claim 1, wherein the temporary power source comprises a capacitor, and wherein supplying power to the power bus from the temporary power source comprises discharging the capacitor while supplying power to the power bus. 6. A method according to claim 1, wherein the temporary power source includes a converter and wherein supplying power to the power bus from the temporary power source at the first electrical frequency comprises converting direct current supplied from at least one of a capacitor and a battery to alternating current. 7. A power transfer device operatively couplable to each of a main load bus, a first power source bus coupled to a first electrical generator operating at a first electrical frequency, a second power source bus coupled to a second electrical generator operating at a second electrical frequency, and a temporary power source, the power transfer device configured to: adjust the output frequency of the temporary power source to match the first electrical frequency;supply power to the main load bus from the temporary power source;disconnect the first power source bus from the main load bus;adjust the output frequency of the temporary power source to match the second electrical frequency, the second electrical frequency being different from the first electrical frequency; andcouple the second power source bus to the main load bus. 8. A power transfer device according to claim 7, wherein the temporary power source is positioned in a single housing with the power transfer device. 9. A power transfer device according to claim 8, wherein the temporary power source comprises an energy storage device. 10. A power transfer device according to claim 9, wherein the temporary power source further comprises a converter configured to convert direct current from the energy storage device to alternating current. 11. A power transfer device according to claim 10, further configured to adjust the output of the converter such that a phase difference between the temporary power source and the second power source bus is about zero degrees. 12. A power transfer device according to claim 7, further configured to charge the energy storage device from the main load bus. 13. A power transfer device according to claim 7, wherein: the first power source bus is electrically couplable to the main load bus through a first switch;the second power source bus is electrically couplable to the main load bus through a second switch; the power transfer device is configured to disconnect the first power source bus from the main load bus by opening the first switch; andthe power transfer device is configured to couple the second power source bus to the main load bus by closing the second switch. 14. A system for transferring a load bus from a first source bus to a second source bus, the first source bus electrically coupled to a first electrical generator and electrically couplable to a power bus through a first switch, the second source bus electrically coupled to a second electrical generator and electrically couplable to the power bus through a second switch, the system comprising: a temporary power source electrically coupled to the load bus; anda controller operatively coupled to the first switch, the second switch, and the temporary power source,wherein the controller is configured to: determine electrical parameters of the first source bus and the second source bus;adjust the output frequency of the temporary power source to substantially match a first electrical frequency determined on the first source bus, wherein the first electrical frequency is a frequency at which a first electrical generator coupled to the first source bus operates;supply power to the power bus from the temporary power source;open the first switch to disconnect the first source bus from the power bus;adjust the output frequency of the temporary power source to substantially match a second electrical frequency detected on the second source bus, the second electrical frequency differing from the first electrical frequency, wherein the second electrical frequency is a frequency at which a second electrical generator coupled to the second source bus operates; andclose the second switch to couple the second source bus to the power bus. 15. A system according to claim 14, wherein the temporary power source comprises an energy storage device comprising at least one of a capacitor and a battery. 16. A system according to claim 15, wherein the controller is further configured to charge the energy storage device from at least one of the power bus, the first source bus, and the second source bus. 17. A system according to claim 14, wherein the controller is further configured to adjust the output of the temporary power source such that a phase difference between the temporary power source and the second power bus is about zero degrees. 18. A system according to claim 14, wherein the controller is configured to adjust the output frequency of the temporary power source to substantially match the second electrical frequency by adjusting the output frequency of the temporary power source from the first electrical frequency to the second electrical frequency. 19. A system according to claim 17, wherein the controller is configured to adjust the output frequency of the temporary power source from the first electrical frequency to the second electrical frequency in less than about 100 milliseconds. 20. A system according to claim 14, wherein at least one of the first source bus and the second source bus is coupled to an electrical generator operating at a variable electrical frequency.