An electric drive hydraulic fracturing pump system includes one or more electric motors, with each electric motor electrically coupled to a dedicated dual inverter to control operation of the motor. A plurality of electric motors may be coupled to each end of a pump crankshaft and configured to provide rotational power to the power end of a hydraulic fracturing pump through a planetary gearset coupled to each end of the crankshaft. A hydraulic cooling circuit having a first and second cooling systems may be used to regulate the temperature of the electric motors and dual inverters.