Pump station control system and method

• US 5,742,500 A
• Filed: 08/23/1995
• Issued: 04/21/1998
• 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): RUGGIERO, JOSEPH F
• Application Number:
  US08/518,190
• Time in Patent Office: 972 Days
• Field of Search: 364/146, 364/188, 364/189, 364/132, 364/138, 364/156, 364/492, 364/494, 364/509, 364/510, 364/505, 364/550, 364/551.01, 417/2, 417/18-20, 417/300
• US Class Current: 700/9
• 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
• CPC Class Codes: G06Q 30/0283 Price estimation or determination

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 monitoring operating parameters of a pump station having a pump for pumping a liquid, the system comprising:

means for sensing a plurality of operating parameters of the pump station;

means for determining a flow cycle time of the pump station;

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 displaying a time history of the operating parameters; and

means in communication with the sensing means for calculating a real-time cost parameter of the system averaged over an integral number of flow cycles.

2. The system recited in claim 1, wherein the real-time cost parameter comprises energy usage per quantity of fluid pumped.

5. The system recited in claim 1, further comprising means in communication with the storing means for identifying a degradation of an element of the pump station from a correlation of the real-time operating parameters with the time history of the operating parameters.

6. The system recited in claim 1, further comprising means in communication with the storing means for disabling the pump upon a comparison of the real-time operating parameters with predetermined acceptable ranges of the operating parameters.

14. The system recited in claim 1, wherein the sensing means comprises means for sensing a fluid level in the pump.

15. The system recited in claim 1, wherein the sensing means comprises means for sensing an energy usage of the pump and means for sensing a quantity of fluid pumped per unit time.

16. The system recited in claim 15, wherein the real-time cost parameter comprises the energy usage per quantity of fluid pumped.

17. The system recited in claim 1, further comprising means in communication with the sensing means for issuing an alarm when an operating parameter is sensed to have a value outside preset acceptable limits.

18. The system recited in claim 17, wherein the storing means further comprises means in communication with the alarm issuing means for storing a time history of issued alarms over a desired period of time.

19. The system recited in claim 18, wherein the displaying means further comprises means for displaying the time history of issued alarms.

20. The system recited in claim 1, wherein the sensing means comprises means for sensing operating parameters of the pump and a level of fluid to be pumped.

3. A system for monitoring operating parameters of a pump station having a pump for pumping a liquid, the system comprising:

means for sensing a plurality of operating parameters of the pump station;

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 displaying a time history of the operating parameters;

means in communication with the sensing means for calculating a real-time cost parameter of the system; and

means in communication with the calculating means for predicting a future cost parameter over a predetermined period of time.

4. The system recited in claim 3, wherein the future cost parameter comprises a predicted energy usage per quantity of fluid pumped.

7. A control system for interfacing between an operator and a pump station having a pump for pumping a liquid, the system comprising:

means for sensing a plurality of operating parameters of the pump station;

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

means for the operator to communicate a control signal to the pump station to effect a change in an operating parameter;

means in communication with the sensing means for calculating from the sensed parameters a real-time cost parameter of the system; and

means in communication with the calculating means for displaying the cost parameter to the operator.

8. The system recited in claim 7, further comprising:

means in communication with the cost-parameter calculating means for calculating a potential optimized cost parameter from the sensed parameters and the real-time cost parameter; and

means in communication with the optimized cost-parameter calculating means for determining and displaying to the operator a recommended change in an operating parameter needed to achieve the optimized cost parameter.

9. A control system for optimizing the energy usage of a pump station having a pump for pumping a liquid, the system comprising:

means for sensing a plurality of operating parameters of the pump station;

means for determining a flow cycle time of the pump station;

an interface in communication with the sensing means between an operator and the pump station for transmitting the sensed operating parameters and the determined flow cycle time to the operator and for transmitting a control signal from the operator to the pump station;

means in communication with the sensing means for calculating energy usage information averaged over an integral number of flow cycles from the sensed operating parameters and the determined flow cycle time;

means in communication with the calculating means for displaying the energy usage information to the operator; and

means in communication with the interface for permitting the operator to adjust a pump station operating parameter with a control signal to optimize for an energy usage parameter.

10. A control system for optimizing the energy usage of a pump station having a pump for pumping a liquid, the system comprising:

means for sensing a plurality of operating parameters of the pump station;

an interface in communication with the sensing means between an operator and the pump station for transmitting the sensed operating parameters to the operator and for transmitting a control signal from the operator to the pump station;

means in communication with the sensing means for calculating energy usage information from the sensed operating parameters;

means in communication with the calculating means for displaying the energy usage information to the operator;

means in communication with the interface for permitting the operator to adjust a pump station operating parameter with a control signal to optimize for an energy usage parameter; and

means in communication with the calculating means for determining a set of altered operating parameters required to achieve an optimized energy usage parameter and for transmitting the set to the operator.

11. An interactive interface and display system for providing communication between an operator and a pump station having a plurality of sensors for sensing a plurality of operating parameters, the system comprising:

a processor;

means for transmitting the operating parameters from the pump station to the processor;

means resident in the processor for performing real-time calculations on the operating parameters to provide an efficiency parameter comprising an energy usage per volume of liquid pumped;

means in communication with the processor for storing time histories of the operating parameters at predetermined time intervals and of the efficiency parameter over a predetermined period of time; and

visual display means in communication with the processor for displaying the operating parameters and the efficiency parameter in real time and for displaying the time histories of the operating parameters and efficiency variable.

12. A method for optimizing an efficiency parameter of a wastewater pumping system having a variable-speed pump for pumping wastewater from a wet well, the wastewater having a level in the wet well, the method comprising the steps of:

setting a wet-well level for starting the pump;

setting a wet-well level for stopping the pump;

determining a minimum pump speed at which the efficiency parameter is an optimal value;

determining the wet-well level;

starting the pump when the level is greater than or equal to the pump start level;

running the pump at the minimum pump speed when the wet-well level is less than or equal to the pump start level;

running the pump at a level-dependent pump speed higher than the minimum pump speed when the wet-well level is greater than the pump start level, the pump speed generally equal to the minimum pump speed plus a level-dependent pump speed increment; and

stopping the pump when the level is less than or equal to the pump stop level.

13. A method for monitoring operating parameters of a pump station having a pump for pumping a liquid, the method comprising the steps of:

sensing a plurality of operating parameters of the pump station;

determining a flow cycle time of the pump station;

transmitting the operating parameters to an operator in real time;

storing the sensed operating parameters at predetermined time intervals over a predetermined period of time;

displaying a time history of the operating parameters; and

calculating a real-time cost parameter of the system averaged over an integral number of flow cycles.

21. A control system for interfacing between an operator and a pump station having a plurality of differentially controllable pumps for pumping a liquid, the system comprising:

means for sensing a plurality of operating parameters of the pump station, including a plurality of operating parameters of the pumps;

means for determining a flow cycle time of the pump station;

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

means for the operator to communicate a control signal to the pump station to effect a change in an operating parameter;

means in communication with the sensing means for calculating from the sensed parameters a real-time cost parameter of the system averaged over an integral number of flow cycles; and

means in communication with the calculating means for displaying the cost parameter to the operator.

22. A control system for interfacing between an operator and a pump station having a plurality of differentially controllable pumps for pumping a liquid, the system comprising:

means for sensing a plurality of operating parameters of the pump station, including a plurality of operating parameters of the pumps;

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

means for the operator to communicate a control signal to the pump station to effect a change in an operating parameter, comprising means for the operator to configure a set of setup parameters for the pumps;

means in communication with the sensing means for calculating from the sensed parameters a real-time cost parameter of the system; and

means in communication with the calculating means for displaying the cost parameter to the operator.

23. The control system recited in claim 22, wherein the control signal communication means comprises means for the operator to direct a pump alternation scheme for the pumps.

24. The control system recited in claim 23, wherein the real-time cost parameter comprises a real-time cost per quantity of fluid pumped, and further comprising:

means in communication with the cost-parameter calculating means for calculating a potential optimized cost per quantity of fluid pumped from the sensed parameters and the real-time cost per quantity of fluid pumped; and

means in communication with the optimized cost-per-quantity-of-fluid-pumped calculating means for determining and displaying to the operator a recommended change in an operating parameter needed to achieve the optimized cost per quantity pumped, thereby permitting the operator to effect an optimization of the cost per quantity of fluid pumped by communicating an appropriate control signal to the pump station.

25. A method for operating a pump in a water pumping station comprising the steps of:

increasing a speed of a pump being used in a water pumping station from a first rate to a second higher outflow rate responsive to a sensor detecting a threshold amount of water to be pumped from the water pumping station;

detecting a water throughput flow rate associated with a selected energy input to the pump;

determining a cost efficiency comprising an energy cost per unit volume of the water pumped at a time of usage of energy;

adjusting the pump speed to optimize the cost efficiency of pumping the water; and

decreasing the speed of the pump to a third outflow rate lower than the second rate upon achieving a preset value for a parameter of the station.

26. The method recited in claim 25, further comprising the step of determining an additional operating cost per unit flow rate the pump the water and adding the additional cost to the energy cost.

27. The method recited in claim 26, wherein the additional operating cost determining step comprises determining at least one of a maintenance cost of the pumping station and an equipment depreciation cost.

28. The method recited in claim 25, wherein the pump comprises a first pump, and further comprising the step of activating a second pump when a water inflow rate exceeds a threshold for efficient operation of the first pump for optimizing efficiency.

29. The method recited in claim 28, wherein the activating step comprises activating the second pump to operate at an outflow rate different from the outflow rate of the first pump to optimize efficiency.

30. The method recited in claim 25, wherein at least one of the first rate or the third rate can comprise a nonpumping rate.

31. The method recited in claim 25, wherein the parameter comprises at least one of the wet-well level and the cost per unit volume of the water pumped.

32. A method for operating a water pumping station comprising the steps of:

increasing a speed of a pump being used in a water pumping station from a first rate to a second higher outflow rate responsive to a sensor detecting a threshold amount of water to be pumped from the water pumping station;

detecting a water throughput flow rate for an energy input to the pump;

determining a cost efficiency comprising a cost per unit volume of the water pumped at the station over a complete cycle of a characteristic parameter of the station; and

returning the pump to a third outflow rate lower than the second outflow rate upon achieving a preset value for the characteristic parameter of the station.

33. The method recited in claim 32, further comprising the step of optimizing a cost efficiency of pump operation for the characteristic parameter.

34. The method recited in claim 32, wherein the cost per unit volume determining step further comprises determining an energy cost at a time of usage.

35. The method recited in claim 32, wherein the station includes a plurality of pumps operable to optimize the cost per unit volume of water pumped.

36. The method recited in claim 35, wherein an optimum efficiency for each of the plurality of pumps in a selected combination of pumps depends upon a speed of other pumps in the selected combination.

37. The method recited in claim 32, further comprising the steps of:

monitoring the cost per unit volume of water pumped; and

comparing the cost per unit volume with a predetermined value characteristic of sound operation, thereby monitoring the pump for a deficient operational cost state.

38. The method recited in claim 37, wherein the deficient operational cost state comprises at least one of a defective pump state and an increased operational cost state.

39. The method recited in claim 32, wherein the increasing step from the first rate to the second rate comprises skipping an outflow rate intermediate between the first rate and the second rate.

40. The method recited in claim 32, further comprising the steps of:

comparing a cost per unit volume of a present water outflow rate with a cost per unit volume of a higher outflow rate; and

increasing a speed of a second pump to achieve a higher water outflow rate upon determining a threshold cost efficiency has been reached.

41. The method recited in claim 40, wherein the speed increasing step comprises increasing the speed by means of a discontinuous increase.

42. The method recited in claim 32, wherein the determining step comprises determining a complete cycle over at least one of:

a water level cycle in the pumping station;

a rate of water inflow cycle into the pumping station; and

a diurnal operation cycle of the pumping station.

43. The method recited in claim 32, further comprising the step of optimizing the cost efficiency over a complete cycle of the characteristic parameter.

44. A method of operating a water pumping station having a well and a plurality of pumps, the method comprising the steps of:

activating a video display comprising a video image showing at least one of;

a water level image in a schematic water well;

a bar graph of water outflow rate from the well;

a bar graph of cost per unit volume of water being pumped from the well; and

a schematic configuration of pumps available for operation in the station;

pressing a control segment of the video display to increase a speed of a pump from a first water outflow rate to a second higher water outflow rate;

measuring a water throughput flow rate at the second rate;

stepping through a plurality of water outflow rates;

monitoring an efficiency for each of the water outflow rates;

pressing the control segment of the video display to activate a pump operational state for a desired water outflow rate having an optimum efficiency; and

returning the pump to a lower water outflow rate upon achieving a preset value for a parameter of the station.

45. The method recited in claim 44, further comprising the step of depressing a visual image control on the video display for changing at least one of:

a number of pumps being used; and

a speed of one of the pumps being used.

46. The method recited in claim 44, further comprising the step of pressing a second visual image control segment on the video display for activating a simulation computer program allowing a user to modify at least one of a group of parameters comprising:

a simulated level of water in the well;

a speed of a pump; and

a number of pumps in use;

thereby enabling the user to view in real time an effect of changing the at least one of the group of parameters.

47. The method recited in claim 44, further comprising the steps of:

calculating a cost efficiency of operating the pump over a predetermined time period; and

displaying a history of the cost efficiency, thereby enabling a user to evaluate cost efficiency over time and pump operability.

48. A method of operating a water pumping station comprising the steps of:

activating a video display comprising a visual image including a visual output of historical data for water outflow, energy consumption of at least one pump, and an efficiency value associated with the pump;

displaying a visual image showing in real time a water outflow rate, energy consumption of the pump, and an efficiency value associated with the pump;

actuating graphical means disposed on the video display to change a speed of the pump;

comparing real-time values of the water outflow rate, energy consumption, and efficiency value with corresponding respective historical values;

, and

determining an efficiency value for the station from at least one of the water outflow rate, the energy consumption, and number of active, water pumps.

49. The method recited in claim 48, wherein the displaying step comprises displaying at least one of a graphical image and a tabular image.

50. The method recited in claim 48, further comprising the step, following the determining step, of optimizing the efficiency value.

51. The method recited in claim 50, wherein the determining and the optimizing step comprise determining and optimizing a cost per unit volume of water pumped.

52. The method recited in claim 48, wherein the determining step comprises determining at least one of wire-to-water efficiency and energy cost per unit volume of water pumped.

53. The method recited in claim 48, wherein the actuating step comprises actuating a touch screen of the video display.