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The present invention provides a redundant prime mover system to drive a machine having an engine coupled to the machine, and a motor/generator coupled to the machine and an electrical network connection. The engine and the motor/generator have three or four operating modes. The first operating mode

The present invention provides a redundant prime mover system to drive a machine having an engine coupled to the machine, and a motor/generator coupled to the machine and an electrical network connection. The engine and the motor/generator have three or four operating modes. The first operating mode drives the machine with the engine. The second operating mode drives the machine with the motor/generator. The third operating mode drives the machine and the motor/generator with the engine such that the motor/generator generates electricity for delivery to the electrical network connection. Alternatively, the third operating mode drives the machine with both the engine and the motor/generator. This alternate operating mode can also be included as a fourth operating mode.

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1. A redundant prime mover system to drive a machine comprising: an engine coupled to the machine; a motor/generator coupled to the machine and an electrical network connection; and a controller communicably coupled to the engine and the motor/generator, the controller having at least three

1. A redundant prime mover system to drive a machine comprising: an engine coupled to the machine; a motor/generator coupled to the machine and an electrical network connection; and a controller communicably coupled to the engine and the motor/generator, the controller having at least three operating modes including a first operating mode comprising the engine driving the machine, a second operating mode comprising the motor/generator driving the machine, and a third operating mode comprising the engine driving the machine and the motor/generator such that the motor/generator generates electricity for delivery to the electrical network connection, wherein the controller selects the first operating mode whenever a first estimated operational cost for the engine is less than an estimated operational cost for the motor/generator, the second operating mode whenever an estimated operational cost for the motor/generator is less than or equal to the first estimated operational cost for the engine, and the third operating mode whenever a selling price for the electricity is greater than the second estimated operational cost for the engine. 2. The system as recited in claim 1, wherein the machine is a compressor.3. The system as recited in claim 1, wherein the machine is a pump.4. The system as recited in claim 1, wherein the engine is a turbine.5. The system as recited in claim 1, wherein the engine is a variable speed engine.6. The system as recited in claim 1, wherein the engine is a coupled to the machine with a clutch.7. The system as recited in claim 1, wherein the engine is a coupled to the machine with a magnetic coupling.8. The system as recited in claim 1, wherein the motor/generator is a coupled to the machine with a clutch.9. The system as recited in claim 1, wherein the motor/generator is a coupled to the machine with a magnetic coupling.10. The system as recited in claim 1, wherein the engine is a coupled to the machine with a gearbox and the motor/generator is a coupled to the machine with the gearbox.11. The system as recited in claim 1, further comprising a skid wherein the engine, the motor/generator and the machine are mounted on the skid.12. The system as recited in claim 1, wherein the controller further includes a fourth operating mode comprising both the engine and the motor/generator driving the machine.13. The system as recited in claim 1, wherein the controller is manually operated.14. The system as recited in claim 1, wherein the controller is a programmed logic controller.15. The system as recited in claim 1, wherein the controller is a computer.16. The system as recited in claim 1, wherein the controller comprises: a processor; a memory communicably coupled to the processor; an engine control interface communicably coupled to the processor and the engine; and a motor/generator control interface communicably coupled to the processor and the motor/generator. 17. The system as recited in claim 1, wherein the controller selects one of the operating modes based on one or more parameters.18. The system as recited in claim 17, wherein the one or more parameters include an estimated operational cost for the engine.19. The system as recited in claim 17, wherein the one or more parameters include an estimated operational cost for the motor/generator.20. The system as recited in claim 17, wherein the one or more parameters include a selling price for electricity.21. The system as recited in claim 17, wherein the one or more parameters include a fuel cost for the engine.22. The system as recited in claim 17, wherein the one or more parameters include an electricity cost for the motor/generator.23. The system as recited in claim 17, wherein the one or more parameters include a time period.24. The system as recited in claim 17, wherein the one or more parameters include an emission limit.25. The system as recited in claim 17, wherein the one or more parameters include an audible noise limit.26. A redu ndant prime mover system to drive a machine comprising: an engine coupled to the machine; a motor/generator coupled to the machine; and a controller communicably coupled to the engine and the motor/generator, the controller having at least three operating modes including a first operating mode comprising the engine driving the machine, a second operating mode comprising the motor/generator driving the machine, and a third operating mode comprising both the engine and the motor/generator driving the machine, wherein the controller selects the first operating mode whenever a first estimated operational cost for the engine is less than an estimated operational cost for the motor/generator, the second operating mode whenever an estimated operational cost for the motor/generator is less than or equal to the first estimated operational cost for the engine, and the third operating mode whenever load sharing is selected. 27. The system as recited in claim 26, wherein the machine is a compressor.28. The system as recited in claim 26, wherein the machine is a pump.29. The system as recited in claim 26, wherein the engine is a turbine.30. The system as recited in claim 26, wherein the engine is a variable speed engine.31. The system as recited in claim 26, wherein the engine is a coupled to the machine with a clutch.32. The system as recited in claim 26, wherein the engine is a coupled to the machine with a magnetic coupling.33. The system as recited in claim 26, wherein the motor/generator is a coupled to the machine with a clutch.34. The system as recited in claim 26, wherein the motor/generator is a coupled to the machine with a magnetic coupling.35. The system as recited in claim 26, wherein the engine is a coupled to the machine with a gearbox and the motor/generator is a coupled to the machine with the gearbox.36. The system as recited in claim 26, further comprising a skid wherein the engine, the motor/generator and the machine are mounted on the skid.37. The system as recited in claim 26, further comprising: an electrical network connection coupled to the motor/generator; and the controller further includes a fourth operating mode comprising the engine driving the machine and the motor/generator such that the motor/generator generates electricity for delivery to the electrical network connection. 38. The system as recited in claim 26, wherein the controller is manually operated.39. The system as recited in claim 26, wherein the controller is a programmed logic controller.40. The system as recited in claim 26, wherein the controller is a computer.41. The system as recited in claim 26, wherein the controller comprises: a processor; a memory communicably coupled to the processor; an engine control interface communicably coupled to the processor and the engine; and a motor/generator control interface communicably coupled to the processor and the motor/generator. 42. The system as recited in claim 26, wherein the controller selects one of the operating modes based on one or more parameters.43. The system as recited in claim 42, wherein the one or more parameters include an estimated operational cost for the engine.44. The system as recited in claim 42, wherein the one or more parameters include an estimated operational cost for the motor/generator.45. The system as recited in claim 42, wherein the one or more parameters include a selling price for electricity.46. The system as recited in claim 42, wherein the one or more parameters include a fuel cost for the engine.47. The system as recited in claim 42, wherein the one or more parameters include an electricity cost for the motor/generator.48. The system as recited in claim 42, wherein the one or more parameters include a time period.49. The system as recited in claim 42, wherein the one or more parameters include an emission limit.50. The system as recited in claim 42, wherein the one or more parameters include an audible noise limit.51. The redundant prime m over system to drive a machine comprising: a motor/generator coupled to the machine and an electrical network connection; an engine coupled to the motor/generator; and a controller communicably coupled to the engine and the motor/generator, the controller having at least three operating modes including a first operating mode comprising the engine driving the machine, a second operating mode comprising the motor/generator driving the machine, and a third operating mode comprising the engine driving the machine and the motor/generator such that the motor/generator generates electricity for delivery to the electrical network connection, wherein the controller selects the first operating mode whenever a first estimated operational cost for the engine is less than an estimated operational cost for the motor/generator, the second operating mode whenever an estimated operational cost for the motor/generator is less than or equal to the first estimated operational cost for the engine, and the third operating mode whenever a selling price for the electricity is greater than the second estimated operational cost for the engine. 52. The system as recited in claim 51, wherein the machine is a compressor.53. The system as recited in claim 51, wherein the machine is a pump.54. The system as recited in claim 51, wherein the engine is a turbine.55. The system as recited in claim 51, wherein the engine is a variable speed engine.56. The system as recited in claim 51, wherein the engine is a coupled to the motor/generator with a clutch.57. The system as recited in claim 51, wherein the engine is a coupled to the motor/generator with a magnetic coupling.58. The system as recited in claim 51, wherein the motor/generator is a coupled to the machine with a clutch.59. The system as recited in claim 51, wherein the motor/generator is a coupled to the machine with a magnetic coupling.60. The system as recited in claim 51, further comprising a skid wherein the engine, the motor/generator and the machine are mounted on the skid.61. The system as recited in claim 51, wherein the controller further includes a fourth operating mode comprising both the engine and the motor/generator driving the machine.62. The system as recited in claim 51, wherein the controller is manually operated.63. The system as recited in claim 51, wherein the controller is a programmed logic controller.64. The system as recited in claim 51, wherein the controller is a computer.65. The system as recited in claim 51, wherein the controller comprises: a processor; a memory communicably coupled to the processor; an engine control interface communicably coupled to the processor and the engine; and a motor/generator control interface communicably coupled to the processor and the motor/generator. 66. The system as recited in claim 51, wherein the controller selects one of the operating modes based on one or more parameters.67. The system as recited in claim 66, wherein the one or more parameters include an estimated operational cost for the engine.68. The system as recited in claim 66, wherein the one or more parameters include an estimated operational cost for the motor/generator.69. The system as recited in claim 66, wherein the one or more parameters include a selling price for electricity.70. The system as recited in claim 66, wherein the one or more parameters include a fuel cost for the engine.71. The system as recited in claim 66, wherein the one or more parameters include an electricity cost for the motor/generator.72. The system as recited in claim 66, wherein the one or more parameters include a time period.73. The system as recited in claim 66, wherein the one or more parameters include an emission limit.74. The system as recited in claim 66, wherein the one or more parameters include an audible noise limit.75. A redundant prime mover system to drive a machine comprising: a motor/generator coupled to the machine; an engine coupled to the motor/generator; and a controller communicably coupled to the engine and the motor/generator, the controller having at least three operating modes including a first operating mode comprising the engine driving the machine, a second operating mode comprising the motor generator driving the machine, and a third operating mode comprising both the engine and the motor/generator driving the machine, wherein the controller selects the first operating mode whenever a first estimated operational cost for the engine is less than an estimated operational cost for the motor/generator, the second operating mode whenever an estimated operational cost for the motor/generator is less than or equal to the first estimated operational cost for the engine, and the third operating mode whenever load sharing is selected. 76. The system as recited in claim 75, wherein the machine is a compressor.77. The system as recited in claim 75, wherein the machine is a pump.78. The system as recited in claim 75, wherein the engine is a turbine.79. The system as recited in claim 75, wherein the engine is a variable speed engine.80. The system as recited in claim 75, wherein the engine is a coupled to the machine with a clutch.81. The system as recited in claim 75, wherein the engine is a coupled to the machine with a magnetic coupling.82. The system as recited in claim 75, wherein the motor/generator is a coupled to the machine with a clutch.83. The system as recited in claim 75, wherein the motor/generator is a coupled to the machine with a magnetic coupling.84. The system as recited in claim 75, wherein the engine is a coupled to the machine with a gearbox and the motor/generator is a coupled to the machine with the gearbox.85. The system as recited in claim 75, further comprising a skid wherein the engine, the motor/generator and the machine are mounted on the skid.86. The system as recited in claim 75, further comprising: an electrical network connection coupled to the motor/generator; and the controller further including a fourth operating mode comprising the engine driving the machine and the motor/generator such that the motor/generator generates electricity for delivery to the electrical network connection. 87. The system as recited in claim 75, wherein the controller is manually operated.88. The system as recited in claim 75, wherein the controller is a programmed logic controller.89. The system as recited in claim 75, wherein the controller is a computer.90. The system as recited in claim 75, wherein the controller comprises: a processor; a memory communicably coupled to the processor; an engine control interface communicably coupled to the processor and the engine; and a motor/generator control interface communicably coupled to the processor and the motor/generator. 91. The system as recited in claim 75, wherein the controller selects one of the operating modes based on one or more parameters.92. The system as recited in claim 91, wherein the one or more parameters include an estimated operational cost for the engine.93. The system as recited in claim 91, wherein the one or more parameters include an estimated operational cost for the motor/generator.94. The system as recited in claim 91, wherein the one or more parameters include a selling price for electricity.95. The system as recited in claim 91, wherein the one or more parameters include a fuel cost for the engine.96. The system as recited in claim 91, wherein the one or more parameters include an electricity cost for the motor/generator.97. The system as recited in claim 91, wherein the one or more parameters include a time period.98. The system as recited in claim 91, wherein the one or more parameters include an emission limit.99. The system as recited in claim 91, wherein the one or more parameters include an audible noise limit.