Method and system for improving pump efficiency and productivity under power disturbance conditions
AssigneeUnico, Inc.
InventorsRobb G. Anderson, Mark E. Garlow, Harry W. Schulz
Life of this patent
Estimating the term…
Abstract
A system for controlling operation of a progressing cavity pump to maintain the motor operating under power disturbance conditions. For a blackout condition, a backspin controller uses regenerative power to provide controlled deceleration of the pump, counteracting backspin and preventing backspinning freely. For a brownout condition, a power dip controller weakens the motor field to maximize pump production consistent with reduced input power availability. For a phase loss or voltage imbalance condition, a phase loss controller reduces motor power output to keep drive system output power at or below single phase capacity.
Claims33
A method for controlling the operation of a pump for optimizing pump efficiency and productivity under electrical power disturbance conditions, wherein the pump is driven by an AC electrical motor having a motor drive;
- said method comprising the steps of:
- determining an occurrence of an electrical power disturbance;
- determining whether the power disturbance is a blackout condition, a brownout condition, a phase loss condition or a voltage imbalance condition;
- and
- using a backspin controller to provide controlled operation of the motor when a power outage condition is determined to be a blackout condition, using a power dip controller to provide controlled operation of the motor when the power outage condition is determined to be a brownout condition, and using a phase loss controller to provide controlled operation of the motor when the power outage condition is determined to be a phase loss or voltage imbalance condition.
A method for controlling the operation of a pump for optimizing pump efficiency and productivity under electrical power disturbance conditions, wherein the pump is driven by an AC electrical motor having a motor drive;
- said method comprising the steps of:
- detecting an occurrence of an electrical power disturbance condition;
- determining when the electrical power disturbance condition is a blackout condition;
- and
- using a backspin controller to provide controlled operation of the motor when the electrical power disturbance condition is determined to be a blackout condition, including operating the backspin controller in a REGENERATIVE mode to maintain the motor drive power during a portion of the blackout condition using load on the pump to recover energy stored in a fluid column produced by the pump to maintain the motor drive power at least during said portion of the blackout condition.
A method for controlling the operation of a pump for optimizing pump efficiency and productivity under electrical power disturbance conditions, wherein the pump is driven by an AC electrical motor having a motor drive energized by a voltage derived from a bus voltage;
- said method comprising the steps of:
- monitoring the bus voltage;
- detecting an occurrence of an electrical power disturbance by determining when the amplitude of the bus voltage decreases below a setpoint value, indicative of a blackout condition;
- and
- providing controlled operation of the motor under the blackout condition to maintain the motor drive power during a portion of the blackout condition, including using a load on the pump to recover energy stored in a fluid column produced by the pump.
A system for controlling the operation of a pump for optimizing pump efficiency and productivity under electrical power disturbance conditions, wherein the pump is driven by an AC electrical motor having a motor drive;
- said system comprising:
- a voltage monitor for providing an output signal indicative of the amplitude of a bus voltage;
- a plurality of parameter monitors for providing outputs indicative of at least one operating parameter of the motor;
- and
- a backspin controller operable in a RUN mode to cause the motor to be driven in a forward direction, providing normal operation of the pump, the backspin controller being responsive to an output signal provided by said voltage monitor, indicative of an electrical power outage condition, to operate in a REGENERATIVE mode in which the backspin controller provides controlled deceleration of the pump by commanding a negative torque to cause the motor to decelerate.
Dependencies are inferred from the claim text.