Controlling a power demand of a hydraulic fracturing system

A system for hydraulic fracturing, comprising:

• a plurality of power sources that include at least one active power source and at least one inactive power source;
• a fluid pump;
• a motor configured to drive the fluid pump;
• a variable frequency drive (VFD) configured to control the motor;
• and
• a controller configured to:
• monitor an available power supply from the at least one active power source, and a current power demand of the system;
• determine, based on monitoring the available power supply and the current power demand, whether a relationship between the current power demand and the available power supply is indicative of an impending power failure;
• determine, based on determining that the relationship between the current power demand and the available power supply indicates the impending power failure, an adjustment to a speed of the motor that achieves a minimum reduction of the current power demand that avoids the impending power failure;
• cause, via the VFD, reduction of the speed of the motor in accordance with the adjustment to achieve the minimum reduction of the current power demand;
• and
• cause activation of the at least one inactive power source to increase the available power supply.