Pump station control system and method

• US 6,178,393 B1
• Filed: 04/20/1998
• Issued: 01/23/2001
• Est. Priority Date: 08/23/1995
• Status: Expired due to Fees

• Current Assignee: William A. Irvin
• Original Assignee: William A. Irvin
• Inventors: Irvin, William A.
• Primary Examiner(s): Teska, Kevin J.
• Assistant Examiner(s): Sergent, Douglas W.
• Application Number:
  US09/063,194
• Time in Patent Office: 1,009 Days
• Field of Search: 395/500.3, 395/500.31, 364/138, 364/156, 364/528.17, 364/149, 702/6, 702/45, 702/12, 703/9, 703/10, 700/29, 700/36, 700/281, 700/282, 700/9
• US Class Current: 703/10
• CPC Class Codes: F04D 15/0066 by changing the speed, e.g. of the driving engine
• CPC Class Codes: F04D 15/029 for pumps operating in parallel
• CPC Class Codes: G05B 13/024 in which a parameter or coefficient is automatically adjusted to optimise the performance
• CPC Class Codes: G05B 23/0267 Fault communication, e.g. human machine interface [HMI]
• CPC Class Codes: G05D 9/12 characterised by the use of electric means

Abstract

The pump station control system and method monitors and displays a time history of the operating parameters of a pump station. Sensed operating parameters are transmitted to an operator in real time and are stored at predetermined time intervals over a predetermined period of time. A real-time cost parameter of the system is calculated that provides a measure of the cost per throughput of the material being pumped. The system can be optimized for the cost parameter by controlling system variables such as pump speed in response to the level of fluid.

Claims

1. A system for simulating a pump station status and for controlling the pump station, the pump station containing a pump for pumping fluid from a well, the system comprising:

a processor having control software resident therein for effecting automatic control of a system parameter of the pump station responsive to a fluid level in the well;

means for inputting a simulated fluid level within a well into the processor;

means for calculating a real-time cost parameter of the system based upon a pump flow rate and a pump power usage;

simulation software means resident in the processor and in communication with the control software, responsive to the simulated fluid level and the real-time cost parameter, for simulating an automatic control of the system parameter; and

means for displaying the simulated automatic control of the system parameter.

2. A system for predicting a failure of an element of a pump station containing a pump for pumping fluid from a well and a motor coupled to the pump, the system comprising:

means for sensing a plurality of operating parameters of the pump station, including means for sensing an energy usage of the pump, comprising a second transducer adapted to provide a signal proportional to an electrical power consumed by the motor, and means for sensing a quantity of fluid pumped per unit time, comprising a first transducer adapted to provide a signal proportional to a flow of fluid at an outlet of the pump;

means in communication with the sensing means for transmitting the operating parameters to an operator in real time;

means in communication with the sensing means for storing the sensed operating parameters at predetermined time intervals over a predetermined period of time;

means in communication with the storing means for comparing a sensed operating parameter with a predetermined derived operating parameter;

means for predicting from the comparing means if a failure of a pump station element is likely;

means in communication with the storing means for displaying a time history of at least one of the stored operating parameters;

means in communication with the sensing means for calculating and for displaying a real-time cost parameter of the system, wherein the real-time cost parameter comprises the energy usage per quantity of fluid pumped;

means for calculating a throughput efficiency comprising;

$\frac{\underset{i}{\overset{N}{\sum <br><br>}}<br><br>Q_i}{\underset{i}{\overset{N}{\sum <br><br>}}<br><br>P_i}$

where Q_i is the flow at a time point i and P_i the consumed power at time point i; and

means for calculating a potential optimized efficiency from the sensed parameters and the real-time efficiency.

3. The system recited in claim 2, wherein a pump failure is predictable by an increase in the real-time cost parameter.

4. The system recited in claim 3, further comprising means for taking a pump offline if the real-time cost parameter is found to increase above a predetermined value.

5. The system recited in claim 4, wherein the pump comprises a first pump, and further comprising a second pump and means for placing the second pump in a lead position upon taking the first pump offline.

6. The system recited in claim 2, wherein the pump motor is adapted to run the pump at a variable speed, and further comprising means for optimizing efficiency by varying the pump speed.

7. The system recited in claim 2, wherein the pump comprises a first pump, and further comprising:

a second pump, both pumps adapted to operate at a constant speed;

means for detecting an efficiency of the first and the second pump; and

means for remotely configuring the first and the second pump to place a pump having a higher efficiency into a lead position in order to optimize an efficiency of the system.

8. The system recited in claim 7, wherein the detecting means comprises means for detecting the efficiency of the first and the second pumps at a series of predetermined intervals, and wherein the configuring means comprises means for reconfiguring the first and the second pump upon a lead pump being detected to have a lower efficiency than a lag pump.