Method and system for improving pump efficiency and productivity under power disturbance conditions
First Claim
1. 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 the occurrence of an electrical power disturbance;
determining when the electrical power disturbance is a power dip condition; and
using a power dip controller to provide controlled operation of the motor when the electrical power disturbance condition is determined to be a power dip condition, including weakening motor field current and motor flux as a bus voltage decreases during the power dip condition.
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Accused Products
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.
36 Citations
15 Claims
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1. 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 the occurrence of an electrical power disturbance;
determining when the electrical power disturbance is a power dip condition; and
using a power dip controller to provide controlled operation of the motor when the electrical power disturbance condition is determined to be a power dip condition, including weakening motor field current and motor flux as a bus voltage decreases during the power dip condition. - View Dependent Claims (2, 3, 4, 5, 6)
- said method comprising the steps of;
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7. 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 the occurrence of an electrical power disturbance by determining when the amplitude of the bus voltage decreases below a predetermined value, indicative of a voltage sag condition; and
providing controlled operation of the motor under a voltage sag condition by weakening motor field current and motor flux of the motor as the bus voltage decreases during the voltage sag condition. - View Dependent Claims (8, 9, 10, 11, 12)
- said method comprising the steps of;
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13. A system for controlling 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 power dip controller for detecting a power dip condition and to provide controlled operation of the pump motor during the power dip condition by reducing the motor field current and motor flux to reduced values for the motor as the bus voltage decreases during the power dip condition. - View Dependent Claims (14, 15)
- said system comprising;
Specification