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 condition is a phase loss condition or a voltage imbalance condition; and
using a phase loss controller to provide controlled operation of the motor when the electrical power disturbance condition is determined to be a phase loss condition or voltage imbalance condition, including reducing motor power output to maintain a drive power output at or below that for a single phase capacity or voltage imbalance power capacity during the phase loss condition or voltage imbalance 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.
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Citations
13 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 condition is a phase loss condition or a voltage imbalance condition; and using a phase loss controller to provide controlled operation of the motor when the electrical power disturbance condition is determined to be a phase loss condition or voltage imbalance condition, including reducing motor power output to maintain a drive power output at or below that for a single phase capacity or voltage imbalance power capacity during the phase loss condition or voltage imbalance condition. - View Dependent Claims (2, 3, 4)
- said method comprising the steps of;
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5. 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 to obtain an indication of bus ripple current; detecting the occurrence of an electrical power disturbance condition by determining when the amplitude of the bus ripple current increases to a value above a setpoint value for rated bus ripple current, indicative of a phase loss condition or a voltage imbalance condition; and providing controlled operation of the motor under a phase loss condition or voltage imbalance condition by reducing motor power output to maintain a drive power output at or below that for a single phase capacity or voltage imbalance power capacity during the phase loss condition or voltage imbalance condition. - View Dependent Claims (6, 7, 8)
- said method comprising the steps of;
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9. 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 monitor for providing an output signal indicative of the amplitude of bus ripple current; and a phase loss controller responsive to the output signal provided by said monitor and a further signal indicative of speed of the motor for providing controlled operation of the motor whenever the electrical power disturbance condition is a phase loss condition or voltage imbalance condition, the phase loss controller reducing motor power output to maintain a drive power output for the motor drive at a level at or below that for a single phase or voltage imbalance power capacity during the phase loss condition or voltage imbalance condition. - View Dependent Claims (10, 11, 12, 13)
- said system comprising;
Specification