Power sources and transmission networks for auxiliary equipment onboard hydraulic fracturing units and associated methods

A system for fracturing a well, the system comprising:

• one or more hydraulic fracturing units, each of the one or more hydraulic fracturing units comprising:
• a chassis;
• a reciprocating plunger pump connected to the chassis and configured to pump a fracturing fluid;
• a powertrain connected to the chassis and configured to power the reciprocating plunger pump, the powertrain including a direct drive gas turbine engine and a drivetrain, the direct drive gas turbine engine operable by use of two or more different types of fuel;
• and
• auxiliary equipment located onboard the chassis, the auxiliary equipment driven by one or more electric motors to support operation of the hydraulic fracturing unit including the reciprocating plunger pump and the powertrain;
• one or more electric power arrangements configured to power the auxiliary equipment of each of the one or more hydraulic fracturing units, each electric power arrangement of the one or more electric power arrangements comprising an engine-generator set configured to generate electric power;
• an electric power network configured to deliver electric power generated by the engine-generator set of at least one electric power arrangement of the one or more electric power arrangements to the one or more electric motors of at least one hydraulic fracturing unit of the one or more hydraulic fracturing units, the electric power network being coupled to the engine-generator set of the at least one electric power arrangement and the one or more electric motors of the at least one hydraulic fracturing unit, the electric power network being switchably connectable to a utility power grid, a battery bank, or another engine-generator set and being configured to deliver electric power generated by the engine-generator set of the at least one electric power arrangement to the one or more electric motors of the at least hydraulic fracturing unit to drive the auxiliary equipment of the at least one hydraulic fracturing unit and to be switchably connected to the utility power grid, the battery bank, or the another engine-generator set to deliver power to the one or more electric motors of the at least one hydraulic fracturing unit responsive to a failure or fault of the engine-generator set of the at least one electric power arrangement;
• and
• a manifold connected to each reciprocating plunger pump of the one or more hydraulic fracturing units, the manifold configured to deliver fracturing fluid from the reciprocating plunger pump to the well, and wherein the electric power network comprises electric buses affixed to the manifold and connecting the one or more hydraulic fracturing units to the one or more electric power arrangements to power the one or more hydraulic fracturing units.