System and Method for Controlling Hybrid and Grid Power in an Electric Fracturing Spread

A method of controlling electrical loads in an electric fracturing spread comprising:

• monitoring input power received from an electric power source on a power bus of the electric fracturing spread;
• measuring a measured voltage or a measured frequency of the input power;
• determining if the measured voltage is less than a first threshold or determining if the measured frequency is less than a second threshold;
• and
• reducing power applied to a selected one of the plurality of electrical loads from the power bus when the measured voltage is less than a first threshold or when the measured frequency is less than a second threshold, wherein reducing the power applied to the selected electrical load reduces an operating speed of an electrical motor.

A method of performing a wellbore servicing operation at a wellsite comprising a well having a wellbore penetrating a subterranean formation, the method comprising:

• positioning a plurality of electrically powered wellbore servicing equipment at the wellsite;
• connecting the wellbore servicing equipment to an electric power source, wherein the electric power source comprises at least one of an electric power grid and a local electric generator located proximate the electric fracturing spread;
• performing the wellbore servicing operation;
• and
• managing electric power during the wellbore servicing operation, wherein managing electric power comprises:
• monitoring input electric power received from the electric power source on a power bus of the wellbore servicing operation;
• measuring a measured voltage or a measured frequency of the input electric power;
• determining if the measured voltage is less than a first threshold or determining if the measured frequency is less than a second threshold;
• and
• reducing electric power applied to a selected electrical load from the electric power bus when the measured voltage is less than a first threshold or when the measured frequency is less than a second threshold, wherein reducing the electric power applied to the selected electrical load reduces an operating speed of a first electrical motor.

An electric fracturing spread at a wellsite comprising a well having a wellbore penetrating a subterranean formation, the electric fracturing spread comprising:

• a plurality of fracturing fluid pumps;
• a power distribution unit configured to receive input power from a power grid and a local generator located proximate the electric fracturing spread and distribute the input power to the plurality of fracturing fluid pumps;
• and
• a load phase back system for controlling the input power distributed to the plurality of fracturing fluid pumps, the load phase back system comprising:
• monitoring circuitry configured to monitor the input power received from the power grid and the local generator, the monitoring circuitry configured to determine a measured voltage and a measured frequency of the input power;
• and
• a controller configured to control the input power distributed to the plurality of fracturing fluid pumps from the power distribution unit according to a value of the measured voltage or according to a value of the measured frequency of the input power, the controller configured to reduce power applied to a selected one of the plurality of fracturing fluid pumps when the measured voltage is less than a first threshold or when the measured frequency is less than a second threshold.