US20130287596A1 - Method and system for identifying and controlling a centrifugal pump - Google Patents
Method and system for identifying and controlling a centrifugal pump Download PDFInfo
- Publication number
- US20130287596A1 US20130287596A1 US13/871,592 US201313871592A US2013287596A1 US 20130287596 A1 US20130287596 A1 US 20130287596A1 US 201313871592 A US201313871592 A US 201313871592A US 2013287596 A1 US2013287596 A1 US 2013287596A1
- Authority
- US
- United States
- Prior art keywords
- control
- pumping circuit
- flow rate
- centrifugal pump
- electric motor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
- F04D15/0022—Control, e.g. regulation, of pumps, pumping installations or systems by using valves throttling valves or valves varying the pump inlet opening or the outlet opening
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0066—Control, e.g. regulation, of pumps, pumping installations or systems by changing the speed, e.g. of the driving engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0088—Testing machines
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
The invention relates to a method and a system for controlling a centrifugal pump (1) actuated by an electric motor (2). The control method comprises:
-
- a first step of selecting a speed and of controlling the variable speed drive (3) in order to apply said speed to the electric motor (2),
- a second step of controlling the solenoid valve (6) over the whole of its operating range at said selected speed,
- a third step of measuring the pressure and the flow rate of the fluid flowing in the pumping circuit and of measuring the electric power supplied to the motor for each operating point of the solenoid valve (6),
- a fourth step of determining, for said selected speed, the pressure curve as a function of the flow rate and the curve of the power supplied as a function of the flow rate.
Description
- The present invention relates to a method and a system for identifying and controlling a centrifugal pump.
- A pumping circuit in which a centrifugal pump is included is driven by a control system.
- This control system comprises an electric motor actuating the centrifugal pump and controlled by a variable speed drive. The system also comprises a valve or a cock making it possible to control the flow rate in the pumping circuit. In normal operation, the control of the centrifugal pump is carried out on the basis of pump curves. These pump curves are defined for a single speed called the nominal speed and represent the pressure as a function of the flow rate, the mechanical power as a function of the flow rate. For a speed other than the nominal speed, there are laws of extrapolation called Rateau laws for creating the link between the magnitudes of the pumping circuit (pressure, flow rate) and the mechanical magnitudes (power, speed):
-
Flow rate=Flow rate_NominalSpeed×(Speed/NominalSpeed) -
Pressure=Pressure_NominalSpeed×(Speed/NominalSpeed)2 -
Power=Power_NominalSpeed×(Speed/NominalSpeed)3 - The pump curves and the extrapolation laws can already be stored in the system or reconstituted during an identification phase. In this identification phase, a pressure sensor and a flow-rate sensor are used to measure the flow rate and the pressure of the fluid flowing in the pumping circuit at each speed of the electric motor corresponding to a mechanical power supplied to the pump. Hitherto, the identification phase, carried out at a nominal speed, allows a correlation between the measurement data of the system, whether they be the data associated with the pumping circuit (pressure, flow rate) or the mechanical data (speed, power). The known drawbacks in the use of these data are of several orders:
-
- The collection of the various magnitudes is carried out with no guarantee of precise synchronization between these four measurements. It is known that the action of a valve or of a cock generates variations in the pumping system. Depending on the configuration of the pumping system, these variations can be oscillating and it is then difficult to collect a quadruplet of magnitudes that are coherent with one another.
- The pump curves are established at nominal speed in compliance with an ISO standard 9906 Annex A which requires 8% accuracy, that can be found insufficient for the required control activities.
- In practice, the extrapolation carried out according to theoretical laws does not always make it possible to obtain the desired accuracy.
- The use of a variable speed drive to control the electric motor and thus exclude the external mechanical measurements introduces a correlation bias between the data available in the control and estimation system, i.e. the pump curves, and the measurement or estimation data available (estimated speed, estimated mechanical power). Specifically it is known that, without a sensor of mechanical magnitudes (position, speed, torque or power) and according to the type of control algorithm used, a variable speed drive may be found to be inaccurate in the estimation of speed and power.
- The object of the invention is to propose a control and identification method and system making it possible, during a dedicated phase, to be sure of the synchronized correlation between the mechanical data applied to the electric motor that are available in the variable speed drive and the data of the pumping circuit collected by the external sensors. This correlation will make it possible to estimate with very great accuracy the magnitudes of the pumping circuit (pressure, flow rate) without using sensors in the pumping circuit, independently of the manufacturer data, that is to say of the nominal pump curves.
- The finality of the estimation of pressure and flow rate magnitudes can be either to diagnose the measurement elements, or to control or monitor the pumping circuit without pressure and flow-rate sensors.
- This object is achieved by a method for controlling a centrifugal pump included in a pumping circuit controlled by a control system, said control system comprising:
-
- a variable speed drive and an electric motor controlled by the variable speed drive so as to actuate the centrifugal pump,
- a measurement or an estimate by the variable speed drive of the mechanical power supplied to the electric motor,
- a solenoid valve designed to control the pumping circuit,
- a pressure sensor designed to measure the pressure of the fluid flowing in the pumping circuit,
- a flow-rate sensor designed to measure the flow rate of the fluid flowing in the pumping circuit,
- a control and processing unit,
said method comprising a phase of identification of the centrifugal pump, carried out by the control and processing unit, prior to the normal operation of said centrifugal pump, said identification phase comprising: - a first step of selecting a speed and of controlling the variable speed drive in order to apply said speed to the electric motor,
- a second step of controlling the solenoid valve over the whole of its operating range at said selected speed,
- a third step of measuring the pressure and the flow rate of the fluid flowing in the pumping circuit and of measuring the electric power supplied to the motor for each operating point of the solenoid valve,
- a fourth step of determining, for said selected speed, the pressure curve as a function of the flow rate and the curve of the power supplied as a function of the flow rate.
- According to one particular feature, the second step, the third step and the fourth step are carried out for several speeds applied to the electric motor.
- According to another particular feature of the invention, for a selected speed, the third step and the fourth step are carried out for each operating point of the solenoid valve.
- The invention also relates to a system for controlling a centrifugal pump included in a pumping circuit, said control system comprising:
-
- a variable speed drive and an electric motor controlled by the variable speed drive so as to actuate the centrifugal pump,
- a measurement or an estimate by the variable speed drive of the mechanical power supplied to the electric motor,
- a solenoid valve designed to control the pumping circuit,
- a pressure sensor designed to measure the pressure of the fluid flowing in the pumping circuit,
- a flow-rate sensor designed to measure the flow rate of the fluid flowing in the pumping circuit,
- a control and processing unit comprising a module for identifying the centrifugal pump, activated prior to the normal operation of said centrifugal pump,
said identification module comprising: - means for selecting a speed and means for controlling the variable speed drive in order to apply said speed to the electric motor,
- means for determining the power supplied to the electric motor for said selected speed,
- means for controlling the solenoid valve over the whole of its operating range at said selected speed,
- means for retrieving the measurements of the pressure and of the flow rate of the fluid flowing in the pumping circuit for each operating point of the solenoid valve,
- means for determining, for said selected speed, the pressure curve as a function of the flow rate and the curve of the power supplied as a function of the flow rate.
- According to one particular feature, the control and processing unit is included in the variable speed drive.
- Other features and advantages will become apparent in the following detailed description made with respect to the appended drawings in which:
-
FIG. 1 represents the pumping circuit and the control system of the invention, -
FIG. 2 represents the sequence applied during the phase of identifying the centrifugal pump, -
FIGS. 3A and 3B represent respectively the pressure/flow rate pump curves and the motor power/flow rate pump curves characterized by the sequence ofFIG. 2 . Marked in bold are the pump curves at the nominal speed. - A pumping circuit comprises a
centrifugal pump 1 controlled by a control system. Such a control system comprises an electric motor 2 designed to actuate the centrifugal pump and avariable speed drive 3 designed to control said electric motor. - Since the architecture of a variable speed drive is well known, it will not be described in the present application.
- The characterization of the
centrifugal pump 1 consists in carrying out an identification phase prior to the normal operation of the pump in the pumping circuit. This identification phase is carried out at least once, for example before the first start-up of the pumping circuit. - The identification phase of the
centrifugal pump 1 consists in reconstituting the pump curves for the nominal speed but also at other operating speeds in order to cover the complete operating range. As shown inFIGS. 3A and 3B , pump curves define, for each speed of the electric motor, the pressure (Pf) of the fluid flowing in the pumping circuit as a function of the flow rate (Df) of the fluid flowing in the pumping circuit (FIG. 3A ) and the motor power (Pmot) as a function of the flow rate (Df) of the fluid flowing in the pumping circuit (FIG. 3B ). - In order to reconstitute the pump curves, the control system must also comprise a
pressure sensor 4 designed to measure the pressure (Pf) of the fluid that flows in the pumping circuit and a flow-rate sensor 5 designed to measure the flow rate (Df) of the fluid flowing in the pumping circuit. Once the identification phase is complete, these sensors are no longer of any use and can be removed. Alternatively, the pumping actuator consisting of a variable speed drive and a centrifugal pump identified according to the proposed method can be inserted into another pumping circuit that has no sensors of the pressure and flow-rate magnitudes and thus provide a control with no sensor of the pumping circuit. - Moreover, in order to ensure the correlation between the data imposed at the input and the data collected at the output during the identification phase, the control system comprises a control and
processing unit 30 making it possible to centralize the control and processing. This control andprocessing unit 30 may for example be a programmable controller or be that which is already present in thevariable speed drive 3. In the rest of the description, it will be considered that the control andprocessing unit 30 is included in the variable speed drive. The control andprocessing unit 30 comprises a module for identifying the characteristics of thecentrifugal pump 1, activated by the operator or activated automatically, for example when the system is first switched on. - The control system of the invention is shown in
FIG. 1 . In thisFIG. 1 , thevariable speed drive 3 is connected to the electric motor 2 and the electric motor 2 controls thecentrifugal pump 1. A solenoid valve 6, placed on the pumping circuit, is controlled directly by the control andprocessing unit 30. The flow-rate sensor 5 and thepressure sensor 4 are connected directly to the control andprocessing unit 30 in order to send their measurement data to the latter. - As shown in
FIG. 2 , when the identification module is activated, the phase of identifying thecentrifugal pump 1 begins. In a first step (E1), the control andprocessing unit 30 activates means for controlling thevariable speed drive 3 in order to apply a first speed to the electric motor 2. The speed is for example chosen from a range stretching from 30% to 120% of the nominal speed. In a second step (E2), for said selected speed, the control andprocessing unit 30 activates means for controlling the solenoid valve 6 for an operating point. Then, in a third step (E3), for each operating point of the solenoid valve 6, the control andprocessing unit 30 records the values supplied by thesensor 4 for sensing the pressure (Pf) of the fluid flowing in the pumping circuit and by thesensor 5 for sensing the flow rate (Df) of the fluid flowing in the pumping circuit and determines, by measurement or by estimation, the power (PMot) supplied by thevariable speed drive 3. All these measurement data are sent to the control andprocessing unit 30 which records them in storage means (step E4). The control andprocessing unit 30 repeats the same operations for a new speed to be applied to the electric motor 2, until all of the speeds have been scanned. Based on the collected data, the control andprocessing unit 30 activates means for determining the pump curves. - Once all the data have been collected, the control and
processing unit 30 establishes each pump curve in order to cover several possible cases of use: -
- The pump curves, at different speeds, can be used during normal operation of the pumping circuit. An interpolation principle can be used to estimate the flow rate and the pressure for a speed comprised between two curves.
- The same principle may also be applied if only two curves are acquired for the nominal speed value and a minimum speed value.
- Another principle may be to store only the curve corresponding to the nominal speed and to calculate adjustment coefficients of the affinity laws based on other pump curves measured for lower speeds.
- Irrespective of the principle of use of the pump curves, it is possible to employ said curves to estimate the pressure and the flow rate during normal operation of the pumping circuit when the pressure and flow-rate sensors are not present.
Claims (6)
1. Method for controlling a centrifugal pump (1) included in a pumping circuit controlled by a control system, said control system comprising:
a variable speed drive (3) and an electric motor (2) controlled by the variable speed drive so as to actuate the centrifugal pump,
a measurement or an estimate by the variable speed drive of the mechanical power supplied to the electric motor,
a solenoid valve (6) designed to control the pumping circuit,
a pressure sensor (4) designed to measure the pressure of the fluid flowing in the pumping circuit,
a flow-rate sensor (5) designed to measure the flow rate of the fluid flowing in the pumping circuit,
a control and processing unit (30),
said method being characterized in that it comprises a phase of identification of the centrifugal pump (1), carried out by the control and processing unit (30), prior to the normal operation of said centrifugal pump, said identification phase comprising:
a first step of selecting a speed and of controlling the variable speed drive (3) in order to apply said speed to the electric motor (2),
a second step of controlling the solenoid valve (6) over the whole of its operating range at said selected speed,
a third step of measuring the pressure and the flow rate of the fluid flowing in the pumping circuit and of measuring the electric power supplied to the motor for each operating point of the solenoid valve (6),
a fourth step of determining, for said selected speed, the pressure curve as a function of the flow rate and the curve of the power supplied as a function of the flow rate.
2. Control method according to claim 1 , characterized in that the second step, the third step and the fourth step are carried out for several speeds applied to the electric motor (2).
3. Control method according to claim 1 , characterized in that, for a selected speed, the third step and the fourth step are carried out for each operating point of the solenoid valve (6).
4. System of controlling a centrifugal pump (1) included in a pumping circuit, said control system comprising:
a variable speed drive (3) and an electric motor (2) controlled by the variable speed drive so as to actuate the centrifugal pump (1),
a measurement or an estimate by the variable speed drive of the mechanical power supplied to the electric motor,
a solenoid valve (6) designed to control the pumping circuit,
a pressure sensor (4) designed to measure the pressure of the fluid flowing in the pumping circuit,
a flow-rate sensor (5) designed to measure the flow rate of the fluid flowing in the pumping circuit,
a control and processing unit (30),
said system being characterized in that the control and processing unit (30) comprises a module for identifying the centrifugal pump, said module being activated prior to the normal operation of said centrifugal pump, and in that said identification module comprises:
means for selecting a speed and means for controlling the variable speed drive (3) in order to apply said speed to the electric motor (2),
means for determining the power supplied to the electric motor (2) for said selected speed,
means for controlling the solenoid valve (6) over the whole of its operating range at said selected speed,
means for retrieving the measurements of the pressure and of the flow rate of the fluid flowing in the pumping circuit for each operating point of the solenoid valve (6),
means for determining, for said selected speed, the pressure curve as a function of the flow rate and the curve of the power supplied as a function of the flow rate.
5. Control system according to claim 4 , characterized in that the control and processing unit (30) is included in the variable speed drive (3).
6. Control method according to claim 2 , characterized in that, for a selected speed, the third step and the fourth step are carried out for each operating point of the solenoid valve (6).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1253882 | 2012-04-26 | ||
FR1253882A FR2990007B1 (en) | 2012-04-26 | 2012-04-26 | METHOD AND SYSTEM FOR IDENTIFYING AND CONTROLLING A CENTRIFUGAL PUMP |
Publications (1)
Publication Number | Publication Date |
---|---|
US20130287596A1 true US20130287596A1 (en) | 2013-10-31 |
Family
ID=47900973
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/871,592 Abandoned US20130287596A1 (en) | 2012-04-26 | 2013-04-26 | Method and system for identifying and controlling a centrifugal pump |
Country Status (6)
Country | Link |
---|---|
US (1) | US20130287596A1 (en) |
EP (1) | EP2657529A1 (en) |
JP (1) | JP2013227975A (en) |
CN (1) | CN103375412B (en) |
BR (1) | BR102013009522A2 (en) |
FR (1) | FR2990007B1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160076549A1 (en) * | 2014-09-12 | 2016-03-17 | Smith & Loveless Inc. | Pump control for operation on a variable pressure force main |
US10415562B2 (en) * | 2015-12-19 | 2019-09-17 | Schlumberger Technology Corporation | Automated operation of wellsite pumping equipment |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2573403B1 (en) * | 2011-09-20 | 2017-12-06 | Grundfos Holding A/S | Pump |
WO2014089694A1 (en) * | 2012-12-12 | 2014-06-19 | S. A. Armstrong Limited | Self learning control system and method for optimizing a consumable input variable |
JP6290119B2 (en) * | 2015-02-25 | 2018-03-07 | 株式会社東芝 | Driving efficiency estimation system, driving efficiency estimation method, driving efficiency estimation device, and computer program |
DE102019212325A1 (en) * | 2019-08-17 | 2021-02-18 | Ziehl-Abegg Se | Method for the quantitative determination of a current operating state-dependent variable of a fan, in particular a pressure change or pressure increase, and fan |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070212210A1 (en) * | 2006-03-08 | 2007-09-13 | Itt Manufacturing Enterprises, Inc. | Method for determining pump flow without the use of traditional sensors |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58113596A (en) * | 1981-12-28 | 1983-07-06 | Toshiba Corp | Flow control device for pump |
US5240380A (en) * | 1991-05-21 | 1993-08-31 | Sundstrand Corporation | Variable speed control for centrifugal pumps |
US6260004B1 (en) * | 1997-12-31 | 2001-07-10 | Innovation Management Group, Inc. | Method and apparatus for diagnosing a pump system |
US6655922B1 (en) * | 2001-08-10 | 2003-12-02 | Rockwell Automation Technologies, Inc. | System and method for detecting and diagnosing pump cavitation |
JP2006307682A (en) * | 2005-04-26 | 2006-11-09 | Ebara Densan Ltd | Pump device |
DE502005009320D1 (en) * | 2005-07-29 | 2010-05-12 | Grundfos Management As | Method for data transmission between a pump unit and a control device and a correspondingly designed pump system |
DE102006022740A1 (en) * | 2006-05-12 | 2007-11-15 | Ksb Aktiengesellschaft | Device for the transmission of measured values |
US8092190B2 (en) * | 2007-04-06 | 2012-01-10 | Baker Hughes Incorporated | Systems and methods for reducing pump downtime by determining rotation speed using a variable speed drive |
DE102007022348A1 (en) * | 2007-05-12 | 2008-11-13 | Ksb Aktiengesellschaft | Device and method for fault monitoring |
-
2012
- 2012-04-26 FR FR1253882A patent/FR2990007B1/en active Active
-
2013
- 2013-03-25 EP EP13160869.7A patent/EP2657529A1/en not_active Withdrawn
- 2013-04-18 BR BR102013009522A patent/BR102013009522A2/en not_active IP Right Cessation
- 2013-04-22 JP JP2013089573A patent/JP2013227975A/en active Pending
- 2013-04-24 CN CN201310145939.2A patent/CN103375412B/en not_active Expired - Fee Related
- 2013-04-26 US US13/871,592 patent/US20130287596A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070212210A1 (en) * | 2006-03-08 | 2007-09-13 | Itt Manufacturing Enterprises, Inc. | Method for determining pump flow without the use of traditional sensors |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160076549A1 (en) * | 2014-09-12 | 2016-03-17 | Smith & Loveless Inc. | Pump control for operation on a variable pressure force main |
US9886018B2 (en) * | 2014-09-12 | 2018-02-06 | Smith & Loveless Inc. | Pump control for operation on a variable pressure force main |
US10415562B2 (en) * | 2015-12-19 | 2019-09-17 | Schlumberger Technology Corporation | Automated operation of wellsite pumping equipment |
Also Published As
Publication number | Publication date |
---|---|
JP2013227975A (en) | 2013-11-07 |
EP2657529A1 (en) | 2013-10-30 |
FR2990007B1 (en) | 2014-04-18 |
CN103375412B (en) | 2016-08-03 |
FR2990007A1 (en) | 2013-11-01 |
BR102013009522A2 (en) | 2016-02-16 |
CN103375412A (en) | 2013-10-30 |
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Owner name: SCHNEIDER TOSHIBA INVERTER EUROPE SAS, FRANCE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:GENEAU, MARC;LE GOUALEC, PHILIPPE;MALRAIT, FRANCOIS;REEL/FRAME:030303/0647 Effective date: 20130307 |
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