CN112577560A - Flow detection method and device of water supply system - Google Patents
Flow detection method and device of water supply system Download PDFInfo
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- CN112577560A CN112577560A CN202011508364.2A CN202011508364A CN112577560A CN 112577560 A CN112577560 A CN 112577560A CN 202011508364 A CN202011508364 A CN 202011508364A CN 112577560 A CN112577560 A CN 112577560A
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- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F9/00—Measuring volume flow relative to another variable, e.g. of liquid fuel for an engine
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Abstract
The invention discloses a flow detection method and a flow detection device of a water supply system, wherein the method comprises the steps of obtaining a voltage value and a current value of a stator of a water pump motor, calculating a stator voltage active component of the water pump motor according to the voltage value, and calculating a stator current active component of the water pump motor according to the current value; calculating the slip ratio of the water pump motor according to the voltage active component, the current active component and the rotor resistance of the water pump motor, and then calculating the actual rotating speed of the water pump motor according to the slip ratio; and detecting the pressure value of the outlet of the water supply system pipe network to obtain the pipe network pressure value, and then calculating the flow of the water supply system pipe network according to the pipe network pressure value, the actual rotating speed and a preset flow detection mathematical model. The production cost of the water supply system pipe network can be reduced by implementing the invention.
Description
Technical Field
The invention relates to the technical field of flow detection, in particular to a flow detection method and device of a water supply system.
Background
Water pumps are machines that deliver or pressurize a liquid. It transfers the mechanical energy of prime mover or other external energy to liquid to increase the energy of liquid, and is mainly used to transfer liquid including water, oil, acid-base liquid, emulsion, suspoemulsion and liquid metal. In order to save energy, meet the requirements of industrial production and civil life, a frequency converter is generally adopted to control a water pump so as to realize dynamic regulation of the flow and pressure of the delivered liquid. The variable frequency water pump is a general name which is driven by a single-phase/three-phase alternating current frequency converter and adjusts the rotating speed of the water pump in real time to realize constant voltage. The system is a new-generation intelligent secondary water supply equipment system, has the series advantages of full-automatic operation, constant cleanness, sanitation, low noise, low vibration, energy conservation, environmental protection, long service life, complete protection functions, simple and convenient operation and maintenance and the like, and is used for building buildings in various cities, small and medium-sized buildings, industrial and agricultural production and manufacture, agriculture/garden irrigation and the like which need secondary water supply and pressurization.
At present, in order to achieve better control, a variable frequency water pump control system needs to acquire flow information of a water supply system pipe network, and a common method is to add a flow detection element switch at an outlet of a water supply system pump controlled by a variable frequency water pump. However, the flow rate detecting element is expensive, which increases the production cost of the water supply system pipe network.
Disclosure of Invention
The embodiment of the invention provides a flow detection method and a flow detection device for a water supply system, which can realize flow detection of the water supply system under the condition of not adopting a flow detection element, thereby reducing the production cost of a pipe network of the water supply system.
An embodiment of the present invention provides a method for detecting a flow rate of a water supply system, including: acquiring a voltage value and a current value of a stator of a water pump motor, calculating a stator voltage active component of the water pump motor according to the voltage value, and calculating a stator current active component of the water pump motor according to the current value;
calculating the slip ratio of the water pump motor according to the voltage active component, the current active component and the rotor resistance of the water pump motor, and then calculating the actual rotating speed of the water pump motor according to the slip ratio;
and detecting the pressure value of the outlet of the water supply system pipe network to obtain the pipe network pressure value, and then calculating the flow of the water supply system pipe network according to the pipe network pressure value, the actual rotating speed and a preset flow detection mathematical model.
Further, the pair of voltage value and current value of acquireing water pump motor stator specifically includes:
collecting three-phase current of a water pump motor stator to obtain a current value of the water pump motor stator;
the method comprises the following steps of collecting direct-current bus voltage of a frequency converter, then calculating three-phase voltage of a water pump motor stator through the following formula, and obtaining a voltage value of the water pump motor stator:
wherein K is the current sampling time, UsaIs the A phase voltage and U of the water pump motor statorsbIs the B-phase voltage and U-phase voltage of the water pump motor statorscIs the C-phase voltage and U of the water pump motor statordcAnd f is the output frequency of the frequency converter.
Further, the calculating the active component of the stator voltage of the water pump motor according to the voltage value and the calculating the active component of the stator current of the water pump motor according to the current value specifically include:
respectively calculating the active components of the stator voltage and the stator current according to the following formulas:
wherein theta is the voltage phase i of the water pump motor stator at the current sampling momentaIs the a phase current i of the water pump motor statorbB phase current i of the water pump motor statorcAnd the phase current is the c phase current of the water pump motor stator.
Further, the calculating a slip ratio of the water pump motor according to the voltage active component, the current active component and a rotor resistance of the water pump motor, and then calculating an actual rotation speed of the water pump motor according to the slip ratio specifically includes:
calculating the slip ratio of the water pump motor by the following formula:
s(k)＝id(k)r2/usd(k)；
wherein s (k) is the slip ratio of the water pump motor, r2The resistance of the water pump motor rotor is used;
calculating the actual rotation speed of the water pump motor by the following formula:
n(k)＝n0(1-s(k))；
wherein n (k) is the actual rotation speed of the water pump motor, n0The synchronous rotating speed of the water pump motor.
Further, the calculating the flow of the water supply system according to the pipe network pressure value, the actual rotating speed and a preset flow detection mathematical model specifically includes:
calculating the flow of a water supply system pipe network through a preset flow detection mathematical model as follows:
wherein Q (K) is the flow of the water supply system pipe network, P (K) is the pipe network pressure value, and a, b and c are preset parameter values.
Further, the preset parameter value is obtained by the following method:
the method comprises the following steps that a water outlet pipeline is externally connected to the outlet of a pipe network of a water supply system, a pressure sensor is arranged at the joint of the water outlet pipeline and the outlet of the pipe network of the water supply system, and then pipe network pressure values of the pipe network of the water supply system at different sampling moments are obtained through the pressure sensor;
an encoder is arranged on an output shaft of the water pump motor, and then rotating speed values of the water pump motor at different sampling moments are obtained through the encoder;
setting a flow detection element at the joint of the water outlet pipeline and the outlet of the pipe network of the water supply system, and then acquiring pipe network flow values of the pipe network of the water supply system at different sampling moments through the flow detection element;
determining a preset parameter value in the flow detection data model by the following formula:
wherein, P1、P2And P3The pressure values n of the pipe network of the water supply system pipe network during three times of sampling1、n2And n3The rotating speed value and Q of the water pump motor during three times of sampling respectively1、Q2And Q3And the flow values of the pipe network of the water supply system pipe network during three times of sampling are respectively obtained.
On the basis of the embodiment of the method item, the invention correspondingly provides an embodiment of a device item;
an embodiment of the present invention provides a flow rate detection device for a water supply system, including: the device comprises a voltage and current detection module, a rotating speed calculation module and a flow detection module;
the voltage and current detection module is used for acquiring a voltage value and a current value of a stator of the water pump motor, calculating a stator voltage active component of the water pump motor according to the voltage value, and calculating a stator current active component of the water pump motor according to the current value;
the rotating speed calculating module is used for calculating the slip ratio of the water pump motor according to the voltage active component, the current active component and the rotor resistance of the water pump motor, and then calculating the actual rotating speed of the water pump motor according to the slip ratio;
the flow detection module is used for detecting the pressure value of the outlet of the water supply system pipe network to obtain the pipe network pressure value, and then calculating the flow of the water supply system pipe network according to the pipe network pressure value, the actual rotating speed and the preset flow detection mathematical model.
The embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides a flow detection method and a device of a water supply system, and the method cancels a flow detection link of a pipe network outlet of the water supply system on the basis of not increasing the hardware material of the existing variable frequency water pump control system; the output flow of the water supply system pipe network is calculated according to a preset flow detection mathematical model by detecting the pressure of the pipe network and the rotating speed value of a water pump motor. When the flow detection is realized, a flow detection element is not required to be arranged, so that the production cost of a water supply system pipe network is reduced.
Drawings
Fig. 1 is a schematic flow chart of a flow rate detection method of a water supply system according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a flow rate detection device of a water supply system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, which is a schematic flow chart of a flow detection method of a water supply system according to an embodiment of the present invention, the method includes:
step S101: and acquiring a voltage value and a current value of a stator of the water pump motor, calculating a stator voltage active component of the water pump motor according to the voltage value, and calculating a stator current active component of the water pump motor according to the current value.
Step S102: and calculating the slip ratio of the water pump motor according to the voltage active component, the current active component and the rotor resistance of the water pump motor, and then calculating the actual rotating speed of the water pump motor according to the slip ratio.
Step S103: and detecting the pressure value of the outlet of the water supply system pipe network to obtain the pipe network pressure value, and then calculating the flow of the water supply system pipe network according to the pipe network pressure value, the actual rotating speed and a preset flow detection mathematical model.
For step S101, in a preferred embodiment, the pair of obtaining the voltage value and the current value of the stator of the water pump motor specifically includes:
collecting three-phase current of a water pump motor stator to obtain a current value of the water pump motor stator;
the method comprises the following steps of collecting direct-current bus voltage of a frequency converter, then calculating three-phase voltage of a water pump motor stator through the following formula, and obtaining a voltage value of the water pump motor stator:
wherein K is the current sampling time, UsaIs the A phase voltage and U of the water pump motor statorsbIs the B-phase voltage and U-phase voltage of the water pump motor statorscIs the C-phase voltage and U of the water pump motor statordcAnd f is the output frequency of the frequency converter.
The stator voltage active component of the water pump motor is calculated according to the voltage value, and the stator current active component of the water pump motor is calculated according to the current value, and the method specifically comprises the following steps:
respectively calculating the active components of the stator voltage and the stator current according to the following formulas:
wherein theta is the voltage phase i of the water pump motor stator at the current sampling momentaIs the a phase current i of the water pump motor statorbB phase current i of the water pump motor statorcAnd the phase current is the c phase current of the water pump motor stator.
In this step, by frequency conversion in the water supply systemVoltage and current detection links in the converter respectively collect direct current bus voltage U in the frequency converterdcAnd the stator three-phase current of the water pump motor, and calculating the value of the stator three-phase voltage of the water pump motor at the current sampling moment through a formula (1): it should be noted that the specific sampling time interval can be set by a designer according to a practical scene and user requirements. The embodiment does not limit the three-phase voltage of the motor stator of the water pump as long as the three-phase voltage can be accurately constructed. And then, calculating the stator voltage active component and the stator current active component of the water pump motor through a formula (2).
For step S102, in a preferred embodiment, the calculating a slip of the water pump motor according to the voltage active component, the current active component and a rotor resistance of the water pump motor, and then calculating an actual rotation speed of the water pump motor according to the slip specifically includes:
calculating the slip ratio of the water pump motor by the following formula:
s(k)＝id(k)r2/usd(k)； (4)
wherein s (k) is the slip ratio of the water pump motor, r2The resistance of the water pump motor rotor is used;
calculating the actual rotation speed of the water pump motor by the following formula:
n(k)＝n0(1-s(k))； (5)
wherein n (k) is the actual rotation speed of the water pump motor, n0The synchronous rotating speed of the water pump motor.
The main purpose of this step is to calculate the actual rotation speed of the water pump motor at the current sampling time, substitute the active component of the stator voltage and the active component of the stator current into the above formula (4) to calculate the slip ratio of the water pump motor at the current sampling time, and then calculate the actual rotation speed of the water pump motor at the current sampling time according to the slip ratio and the synchronous rotation speed by using the above formula (5). It should be noted that the synchronous rotation speed of the water pump motor is calculated by the following formula:
p is the number of pole pairs generated by the stator winding, and f is the frequency of the current.
For step S103, first, the preset flow detection mathematical model needs to be explained:
the preferable expression of the flow detection data model is as follows:
wherein Q (K) is the flow of the water supply system pipe network, P (K) is the pipe network pressure value, and a, b and c are preset parameter values.
In a preferred embodiment, the preset parameter value is obtained by:
the method comprises the following steps that a water outlet pipeline is externally connected to the outlet of a pipe network of a water supply system, a pressure sensor is arranged at the joint of the water outlet pipeline and the outlet of the pipe network of the water supply system, and then pipe network pressure values of the pipe network of the water supply system at different sampling moments are obtained through the pressure sensor;
an encoder is arranged on an output shaft of the water pump motor, and then rotating speed values of the water pump motor at different sampling moments are obtained through the encoder;
setting a flow detection element at the joint of the water outlet pipeline and the outlet of the pipe network of the water supply system, and then acquiring pipe network flow values of the pipe network of the water supply system at different sampling moments through the flow detection element;
determining a preset parameter value in the flow detection data model by the following formula:
wherein, P1、P2And P3The pressure values n of the pipe network of the water supply system pipe network during three times of sampling1、n2And n3The rotating speed value and Q of the water pump motor during three times of sampling respectively1、Q2And Q3Respectively for three timesAnd (4) sampling the pipe network flow value of the water supply system pipe network.
Specifically, before flow detection, a flow detection mathematical model meeting the flow-pressure-water pump motor rotating speed constraint relation in a pipe network system needs to be constructed;
it is therefore necessary to measure the parameter values a, b and c of the mathematical flow rate measurement model in advance.
The alternative operating method is as follows:
step 1: externally connecting a section of pipeline not less than 50 cm to an outlet of the existing water supply pipe network system, and installing a pressure sensor in the outlet of the existing pipe network to obtain the pressure of the pipe network; obtaining a rotating speed value of the water pump motor through an encoder arranged on an output shaft of the water pump motor; specifically, the specific model of external pipeline and encoder can be set by the designer according to practical scene and user's demand. As long as the detection device can accurately acquire the water supply system pipeline pressure value at the current moment and the specific rotating speed of the water pump motor, the embodiment does not limit the values.
Step 2: and (3) changing the flow of the pipe network, and measuring three inherent parameter values a, b and c in the flow detection mathematical model by adopting the following formula (7) after the pressure difference of the pipe network is stabilized.
And finally substituting the values of a, b and c into a formula (6) to obtain the flow detection mathematical model.
In the invention, the parameter values a, b and c are measured only before the flow detection is started, and an encoder and a flow detection element are not needed to be arranged when the flow detection is carried out on the water supply system pipe network at each subsequent sampling moment. Therefore, when a water supply system pipe network is established, the accurate regulation and control of the pipeline pressure of the water supply system by the variable-frequency water pump control system can be realized without setting a flow detection element, and the overall production cost of the water supply system pipe network is reduced.
On the basis of the above method item embodiment, the present invention correspondingly provides an apparatus item embodiment:
as shown in fig. 2, an embodiment of the invention provides a voltage and current detection module, a rotation speed calculation module and a flow detection module;
the voltage and current detection module is used for acquiring a voltage value and a current value of a stator of the water pump motor, calculating a stator voltage active component of the water pump motor according to the voltage value, and calculating a stator current active component of the water pump motor according to the current value;
the rotating speed calculating module is used for calculating the slip ratio of the water pump motor according to the voltage active component, the current active component and the rotor resistance of the water pump motor, and then calculating the actual rotating speed of the water pump motor according to the slip ratio;
the flow detection module is used for detecting the pressure value of the outlet of the water supply system pipe network to obtain the pipe network pressure value, and then calculating the flow of the water supply system pipe network according to the pipe network pressure value, the actual rotating speed and the preset flow detection mathematical model.
It should be understood that the specific methods executed by the modules in the above-mentioned apparatus embodiments of the present invention correspond to the methods shown in the above-mentioned method embodiments of the present invention, and are not described herein again.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
By implementing the embodiment of the invention, the flow of the water supply system pipe network can be estimated by using the voltage and the current of the frequency converter in the water supply system, and a flow detection element at the outlet of the water supply system pipe network is cancelled, so that the cost of the pipe network system is reduced and the reliability of the whole pipe network system is improved.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (7)
1. A flow detection method of a water supply system is characterized by comprising the following steps:
acquiring a voltage value and a current value of a stator of a water pump motor, calculating a stator voltage active component of the water pump motor according to the voltage value, and calculating a stator current active component of the water pump motor according to the current value;
calculating the slip ratio of the water pump motor according to the stator voltage active component, the stator current active component and the rotor resistance of the water pump motor, and then calculating the actual rotating speed of the water pump motor according to the slip ratio;
and detecting the pressure value of the outlet of the water supply system pipe network to obtain the pipe network pressure value, and then calculating the flow of the water supply system pipe network according to the pipe network pressure value, the actual rotating speed and a preset flow detection mathematical model.
2. The method for detecting the flow of the water supply system according to claim 1, wherein the step of obtaining the voltage value and the current value of the stator of the water pump motor specifically comprises the steps of:
collecting three-phase current of a water pump motor stator to obtain a current value of the water pump motor stator;
the method comprises the following steps of collecting direct-current bus voltage of a frequency converter, then calculating three-phase voltage of a water pump motor stator through the following formula, and obtaining a voltage value of the water pump motor stator:
wherein K is the current sampling time, UsaIs the A phase voltage and U of the water pump motor statorsbIs the B-phase voltage and U-phase voltage of the water pump motor statorscIs the C-phase voltage and U of the water pump motor statordcAnd f is the output frequency of the frequency converter.
3. The method for detecting the flow of the water supply system according to claim 2, wherein the calculating the active component of the stator voltage of the water pump motor according to the voltage value and the calculating the active component of the stator current of the water pump motor according to the current value specifically comprises:
respectively calculating the active components of the stator voltage and the stator current according to the following formulas:
wherein theta is the voltage phase i of the water pump motor stator at the current sampling momentaIs the a phase current i of the water pump motor statorbB phase current i of the water pump motor statorcAnd the phase current is the c phase current of the water pump motor stator.
4. The method for detecting flow of a water supply system according to claim 3, wherein the calculating a slip ratio of the water pump motor according to the stator voltage active component, the stator current active component and a rotor resistance of the water pump motor, and then calculating an actual rotation speed of the water pump motor according to the slip ratio specifically comprises:
calculating the slip ratio of the water pump motor by the following formula:
s(k)＝id(k)r2/usd(k)；
wherein s (k) is the slip ratio of the water pump motor, r2The resistance of the water pump motor rotor is used;
calculating the actual rotation speed of the water pump motor by the following formula:
n(k)＝n0(1-s(k))；
wherein n (k) is the actual rotation speed of the water pump motor, n0The synchronous rotating speed of the water pump motor.
5. The method for detecting the flow rate of the water supply system according to claim 4, wherein the calculating the flow rate of the water supply system according to the pipe network pressure value, the actual rotation speed and a preset flow rate detection mathematical model specifically comprises:
calculating the flow of a water supply system pipe network through a preset flow detection mathematical model as follows:
wherein Q (K) is the flow of the water supply system pipe network, P (K) is the pipe network pressure value, and a, b and c are preset parameter values.
6. The flow rate sensing method of a water supply system according to claim 5, wherein the preset parameter value is obtained by:
the method comprises the following steps that a water outlet pipeline is externally connected to the outlet of a pipe network of a water supply system, a pressure sensor is arranged at the joint of the water outlet pipeline and the outlet of the pipe network of the water supply system, and then pipe network pressure values of the pipe network of the water supply system at different sampling moments are obtained through the pressure sensor;
an encoder is arranged on an output shaft of the water pump motor, and then rotating speed values of the water pump motor at different sampling moments are obtained through the encoder;
setting a flow detection element at the joint of the water outlet pipeline and the outlet of the pipe network of the water supply system, and then acquiring pipe network flow values of the pipe network of the water supply system at different sampling moments through the flow detection element;
determining a preset parameter value in the flow detection data model by the following formula:
wherein, P1、P2And P3The pressure values n of the pipe network of the water supply system pipe network during three times of sampling1、n2And n3The rotating speed value and Q of the water pump motor during three times of sampling respectively1、Q2And Q3And the flow values of the pipe network of the water supply system pipe network during three times of sampling are respectively obtained.
7. A flow rate detecting device for a water supply system, comprising: the device comprises a voltage and current detection module, a rotating speed calculation module and a flow detection module;
the voltage and current detection module is used for acquiring a voltage value and a current value of a stator of the water pump motor, calculating a stator voltage active component of the water pump motor according to the voltage value, and calculating a stator current active component of the water pump motor according to the current value;
the rotating speed calculating module is used for calculating the slip ratio of the water pump motor according to the active stator voltage component, the active stator current component and the rotor resistance of the water pump motor, and then calculating the actual rotating speed of the water pump motor according to the slip ratio;
the flow detection module is used for detecting the pressure value of the outlet of the water supply system pipe network to obtain the pipe network pressure value, and then calculating the flow of the water supply system pipe network according to the pipe network pressure value, the actual rotating speed and the preset flow detection mathematical model.
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