System and method for managing transient power disruptions on ESP motor drives

A method for controlling an electric submersible pump during a transient power interruption, wherein the electric submersible pump includes an electric motor, the method comprising the steps of:

• connecting a variable speed drive to a power source, wherein the variable speed drive has a DC bus that is charged by the power source;
• charging one or more rechargeable batteries within a power backup;
• connecting the power backup to the variable speed drive;
• operating the motor with the variable speed drive;
• detecting a disruption in AC power from the power source to the variable speed drive;
• applying power from the power backup to the variable speed drive to operate the motor during the transient interruption in electrical power;
• monitoring the voltage on the DC bus of the variable speed drive;
• and
• disconnecting power from the variable speed drive to the motor if the voltage on the DC bus falls below a threshold value.

A power backup for use in supporting the operation of an electric motor within a pumping system during a transient power interruption, wherein the electric motor is driven by a variable speed drive that is connected to a mains power source, the power backup comprising:

• one or more rechargeable batteries;
• a charging system connected to the one or more rechargeable batteries;
• and
• a power backup controller that includes a computer-implemented software program, wherein the power backup controller is configured to cause the variable speed drive to operate the electric motor of the pumping system under a reduced power profile if the power backup controller determines that a fluctuation has occurred in the mains power source.