CN113901603B - Method and device for evaluating uncertainty of energy efficiency measurement of water pump unit - Google Patents
Method and device for evaluating uncertainty of energy efficiency measurement of water pump unit Download PDFInfo
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Abstract
The invention provides a method and a device for evaluating the uncertainty of energy efficiency measurement of a water pump unit driven by a three-phase asynchronous motor, and provides a method for evaluating the uncertainty of energy efficiency measurement of the water pump unit driven by the three-phase asynchronous motor, a method for calculating the operation efficiency of the three-phase asynchronous motor driven by the water pump unit and evaluating the uncertainty of the operation efficiency of the water pump unit, a method for evaluating the uncertainty of power consumption of the water pump unit by hundreds of tons of meters, and the influence of the maximum allowable error, accuracy level and stability of measuring instrument equipment on the energy efficiency measurement result of the water pump unit is quantified according to the calculation result of the uncertainty. When the uncertainty result can not meet the user requirement, the uncertainty influence introduced by each instrument measurement can be reversely deduced, so that the most serious component of the influence of the result is found, an optimal instrument configuration scheme is provided for reducing the uncertainty of the system, and the abrupt increase of the manufacturing cost of the measurement system caused by excessively pursuing a single index is avoided.
Description
Technical Field
The invention relates to the technical field of energy efficiency measurement of energy consumption equipment, in particular to an energy efficiency measurement uncertainty assessment method for a water pump unit driven by a three-phase asynchronous motor.
Background
The water pump unit is high energy consumption equipment, the energy efficiency measurement of the water pump unit is an effective means for obtaining the efficiency of the water pump unit, the energy saving transformation of the water pump unit requires uncertainty assessment on the energy efficiency measurement of the water pump unit, the uncertainty range of the measurement error of the measurement system is clearly measured, and the stability of the measurement system is ensured.
However, the prior art fails to provide an energy efficiency measurement uncertainty assessment method for a water pump unit driven by a three-phase asynchronous motor, and quantitative calculation cannot be realized.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a method for evaluating the uncertainty of the energy efficiency measurement of a water pump unit driven by a three-phase asynchronous motor, which is used for defining the uncertainty range of the measurement error of an energy efficiency measurement system of the water pump unit.
The invention adopts the following technical scheme:
An evaluation method for the uncertainty of energy efficiency measurement of a water pump unit, comprising the following steps:
Step 1: collecting operation parameters of a three-phase asynchronous motor, and evaluating the uncertainty of the operation efficiency of the three-phase asynchronous motor;
step 2: collecting operation parameters of a water pump unit driven by a three-phase asynchronous motor, and evaluating the uncertainty of the operation efficiency of the water pump unit;
Step 3: collecting operation parameters of a water pump unit driven by a three-phase asynchronous motor, calculating the power consumption of the water pump unit per hundred tons of meters, and evaluating the uncertainty of the power consumption of the water pump unit per hundred tons of meters;
Step 4: and determining the optimal configuration scheme of the water pump unit measuring instrument according to the uncertainty calculation result.
Preferably, the step 1 includes:
s11: repeatedly measuring the driving three-phase asynchronous motor, and calculating the operation efficiency of the three-phase asynchronous motor for driving the water pump unit;
S12: calculating an experimental standard deviation of the operation efficiency of the three-phase asynchronous motor driven by the water pump unit by using a Bessel formula;
S13: calculating a standard uncertainty component of class A evaluation of the operation efficiency of the three-phase asynchronous motor;
s14: calculating the standard uncertainty introduced by the measurement of the current I of the three-phase asynchronous motor and the standard uncertainty introduced by the current load rate beta of the three-phase asynchronous motor;
S15: and calculating the uncertainty of the synthesis standard of the operation efficiency of the three-phase asynchronous motor, the uncertainty of the operation efficiency of the three-phase asynchronous motor relative to the synthesis standard and the uncertainty of the load rate of the three-phase asynchronous motor relative to the expansion uncertainty according to the uncertainty.
Preferably, the step 2 includes:
S21: repeatedly measuring a water pump unit system for driving the three-phase asynchronous motor, and calculating the operation efficiency of the water pump unit;
S22: calculating the experimental standard deviation of the running efficiency of the water pump unit by using a Bessel formula;
S23: calculating a standard uncertainty component of class A evaluation of the running efficiency of the water pump unit;
S24: the method comprises the steps of respectively calculating the standard uncertainty introduced by measuring the input power N 1 of the three-phase asynchronous motor, the standard uncertainty introduced by measuring the average flow velocity of inlet liquid, the standard uncertainty introduced by measuring the perimeter L 1 of the inlet pipeline and the standard uncertainty introduced by measuring the perimeter L 2 of the outlet pipeline;
S25: calculating a standard uncertainty introduced by the inlet pressure measurement to the vertical distance z 1 of the pump horizontal centerline, a standard uncertainty introduced by the outlet pressure measurement to the vertical distance z 2 of the pump horizontal centerline, a standard uncertainty introduced by the pump inlet pressure P 1 measurement, and a standard uncertainty introduced by the pump outlet pressure P 2 measurement, and a standard uncertainty introduced by the inlet conduit wall thickness delta 1 measurement and a standard uncertainty introduced by the outlet conduit wall thickness delta 2 measurement, respectively;
S26: calculating a standard uncertainty of an inlet pipe inner diameter D 1, a standard uncertainty of an outlet pipe inner diameter D 2, a standard uncertainty of a pump flow rate Q, a standard uncertainty of a pump outlet liquid average flow rate v 2, a standard uncertainty of a motor operating efficiency eta d, a standard uncertainty of a pump shaft power N b, a standard uncertainty of a pump static pressure difference delta P and a standard uncertainty of a pump lift H respectively;
s27: and calculating the uncertainty of the synthesis standard of the operation efficiency of the water pump unit, the uncertainty of the operation efficiency of the water pump unit relative to the synthesis standard and the uncertainty of the operation efficiency of the water pump unit relative to the expansion uncertainty of the operation efficiency of the water pump unit according to the uncertainty.
Preferably, the step 3 includes:
s31: repeatedly measuring the driving three-phase asynchronous motor, and calculating the power consumption of the water pump unit in hundreds of tons of meters;
s32: calculating the experimental standard deviation of the power consumption of the water pump unit per ton of hundred meters by using a Bessel formula;
s33: calculating standard uncertainty components of class A evaluation of the power consumption of the water pump unit in hundred tons of meters;
S34: respectively calculating the standard uncertainty of the system conveying efficiency, the standard uncertainty of the operation efficiency of the water pump unit and the standard uncertainty of the total liquid conveying efficiency;
s35: and calculating the composite uncertainty of the power consumption of one hundred tons of meters and the relative expansion uncertainty of the power consumption of one hundred tons of meters and the relative composite standard uncertainty of the power consumption of one hundred tons of meters according to the uncertainty.
Preferably, the step 4 includes:
s41: setting an expected value, evaluating a calculation result according to uncertainty, respectively comparing the uncertainty of the operation efficiency of the three-phase asynchronous motor for driving the water pump unit, the uncertainty of the operation efficiency of the water pump unit and the uncertainty of the power consumption of the water pump unit, which are hundreds of meters per ton, with the expected value, if the uncertainty is lower than the expected value, enabling the measuring instrument to meet the measurement requirement, and if the uncertainty is higher than the expected value, entering the next step;
S42: the method comprises the steps of adjusting related measurement quantities, selecting the accuracy grade of selected instrument equipment corresponding to the measurement quantities as a median value, selecting the accuracy grade higher than and lower than the median value upwards and downwards, calculating the operation efficiency uncertainty of a three-phase asynchronous motor for driving a water pump unit, the operation efficiency uncertainty of the water pump unit and the uncertainty of the power consumption of the water pump unit in hundred tons of meters under different measurement instrument accuracy grades, drawing a curve of measurement quantity-uncertainty, searching instrument equipment with the largest influence on the uncertainty, and simultaneously, considering the cost of the instrument equipment, and providing an optimal instrument configuration scheme for reducing the uncertainty of a system.
Preferably, the correlation measurement includes: measuring the current I of the three-phase asynchronous motor, measuring the input power N 1 of the three-phase asynchronous motor, measuring the average flow velocity of inlet liquid, measuring the perimeter L 1 of the pipeline at the inlet and measuring the perimeter L 2 of the pipeline at the outlet; the inlet pressure measurement is calculated to be the vertical distance z 1 from the pump horizontal centerline, the outlet pressure measurement is calculated to be the vertical distance z 2 from the pump horizontal centerline, the pump inlet pressure P 1 measurement and the pump outlet pressure P 2 measurement, and the inlet conduit wall thickness delta 1 measurement and the outlet conduit wall thickness delta 2 measurement.
The invention also provides a device for evaluating the uncertainty of the energy efficiency measurement of the water pump unit, which is used for realizing the method of the invention, and comprises the following steps:
The three-phase asynchronous motor operation efficiency uncertainty evaluation module is used for collecting operation parameters of the three-phase asynchronous motor and evaluating the operation efficiency uncertainty of the three-phase asynchronous motor;
the water pump unit operation efficiency uncertainty evaluation module is used for collecting operation parameters of a water pump unit driven by the three-phase asynchronous motor and evaluating the operation efficiency uncertainty of the water pump unit;
The system comprises a water pump unit ton and hundred-meter power consumption uncertainty evaluation module, a three-phase asynchronous motor and a three-phase asynchronous motor, wherein the water pump unit ton and hundred-meter power consumption uncertainty evaluation module is used for collecting operation parameters of the water pump unit driven by the three-phase asynchronous motor, calculating the ton and hundred-meter power consumption of the water pump unit and evaluating the ton and hundred-meter power consumption uncertainty of the water pump unit;
and the optimal configuration scheme selection module is used for determining the optimal configuration scheme of the water pump unit measuring instrument according to the uncertainty calculation result.
Further, the invention provides a terminal, which comprises a processor and a storage medium; the storage medium is used for storing instructions; the processor is operative to perform the steps of the method of the present invention in accordance with the instructions.
Further, the present invention proposes a computer readable storage medium having stored thereon a computer program which when executed by a processor realizes the steps of the method of the present invention.
The invention has the beneficial effects that compared with the prior art:
the invention discloses an uncertainty evaluation method for energy efficiency measurement of a water pump unit driven by a three-phase asynchronous motor, which can quantify the uncertainty of a measurement system during energy efficiency measurement of the water pump unit driven by the three-phase asynchronous motor.
The invention discloses a method for calculating the operation efficiency and evaluating the uncertainty of a three-phase asynchronous motor driven by a water pump unit, a method for evaluating the operation efficiency uncertainty of the water pump unit and a method for evaluating the uncertainty of the power consumption of the water pump unit, wherein the method is used for solving the problems of poor efficiency, poor efficiency and poor reliability of the three-phase asynchronous motor.
According to the calculation results of the operation efficiency uncertainty of the three-phase asynchronous motor for driving the water pump unit, the operation efficiency uncertainty of the water pump unit and the ton hundred meter power consumption uncertainty of the water pump unit, the influence of the maximum allowable error, accuracy level and stability of the measuring instrument and equipment on the energy efficiency measurement result of the water pump unit can be quantified. When the uncertainty result can not meet the user requirement, the uncertainty influence introduced by each instrument measurement can be reversely deduced, so that the most serious component of the influence of the result is found, an optimal instrument configuration scheme is provided for reducing the uncertainty of the system, and the abrupt increase of the manufacturing cost of the measurement system caused by excessively pursuing a single index is avoided.
Drawings
FIG. 1 is a flow chart of a method for assessing energy efficiency measurement uncertainty of a water pump assembly driven by a three-phase asynchronous motor;
FIG. 2 is a flow chart for assessing operational efficiency uncertainty of a three-phase asynchronous motor for water pump assembly drive;
FIG. 3 is a flow chart of a method for assessing uncertainty of the operation efficiency of a water pump unit;
fig. 4 is a flowchart of a method for evaluating uncertainty of power consumption of one hundred tons of meters of a water pump unit.
Detailed Description
The application is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and are not intended to limit the scope of the present application.
The invention discloses an uncertainty evaluation method for energy efficiency measurement of a water pump unit driven by a three-phase asynchronous motor, which is used for quantifying the uncertainty of a measurement system during the energy efficiency measurement of the water pump unit driven by the three-phase asynchronous motor.
As shown in FIG. 1, the method for evaluating the uncertainty of energy efficiency measurement of the water pump unit driven by the three-phase asynchronous motor comprises the following steps:
Step 1: and collecting operation parameters of the three-phase asynchronous motor, and evaluating the uncertainty of the operation efficiency of the three-phase asynchronous motor. As shown in fig. 2, step 1 is used for evaluating the operation efficiency uncertainty of a three-phase asynchronous motor driven by a water pump unit, and specifically includes:
A. And carrying out 10 independent repeated measurements on the three-phase asynchronous motor driven by the rated voltage 380V, the rated power 7.5kW and the rated efficiency 87%, and calculating the operation efficiency of the three-phase asynchronous motor driven by the water pump unit, wherein the operation efficiency is shown in the following formula:
Wherein:
Wherein:
η d is the operation efficiency of the three-phase asynchronous motor for driving the water pump unit,%;
η e denotes the rated motor efficiency,%;
Beta is the current load rate of the three-phase asynchronous motor,%;
i e is the rated current of the three-phase asynchronous motor, A;
i is the real-time current of the three-phase asynchronous motor, A.
After 10 independent measurements, the operation efficiency of the three-phase asynchronous motor for driving the water pump unit is calculated to be eta d1,ηd2,.....,ηd10 respectively, and the 10 measurements are the measurement times.
B. Calculating the experimental standard deviation of the operation efficiency of the three-phase asynchronous motor driven by the water pump unit by using a Bessel formula,
Wherein:
s (eta d) refers to the experimental standard deviation of the operation efficiency of the three-phase asynchronous motor;
η dj is an actual measurement value of the operation efficiency of the three-phase asynchronous motor obtained by independent measurement at the j-th time;
the running efficiency average value of the three-phase asynchronous motor obtained by n independent measurements is represented by n=10 in the example;
C. calculating standard uncertainty component of class A evaluation of operation efficiency of three-phase asynchronous motor
U A(ηd) refers to a standard uncertainty component of class a assessment of the operation efficiency of the three-phase asynchronous motor;
m refers to the actual number of measurements in each independent measurement.
D. calculating standard uncertainty introduced by current I measurement of three-phase asynchronous motor
The standard uncertainty introduced by the current I measurement of the three-phase asynchronous motor is expressed as
Wherein:
MPEV CP is the maximum allowable error of the probe of the current testing device;
MPEV C is the maximum allowable error of the body of the current testing device;
E. calculating standard uncertainty introduced by current load rate beta of three-phase asynchronous motor
F. calculating the uncertainty of the synthesis standard of the operation efficiency of the three-phase asynchronous motor:
the uncertainty of the operation efficiency of the three-phase asynchronous motor relative to the synthesis standard is calculated as follows:
the uncertainty of the load rate relative expansion of the three-phase asynchronous motor is calculated as follows:
Urel(ηd)＝kucrel(ηd)＝0.52％ (9)
Wherein:
k means inclusion factor.
Step 2: and collecting operation parameters of a water pump unit driven by the three-phase asynchronous motor, and evaluating the uncertainty of the operation efficiency of the water pump unit.
As shown in fig. 3, the evaluation of the uncertainty of the operation efficiency of the water pump unit in step 2 specifically includes:
A. 10 independent repeated measurements are carried out on a water pump unit system which drives a three-phase asynchronous motor and has 380V rated voltage, 7.5kW rated power and 87% rated efficiency, and the operation efficiency calculation formula of the water pump unit is shown as follows
Wherein the method comprises the steps of
Nb＝N1×ηd×ηc (17)
Wherein:
η b is the running efficiency of the water pump unit,%;
ρ is the density of the liquid, kg/m 3;
g is the gravitational constant, m/s 2;
q is the flow of the pump, m 3/h;
h is pump lift, m;
Δp refers to the pump static pressure difference, m;
P 1 is the pump inlet pressure, pa;
p 2 refers to pump outlet pressure, pa;
l 1 is the circumference of the pipeline at the inlet, m;
l 2 is the pipe circumference at the point of the mouth, m;
delta 1 refers to the inlet pipe wall thickness, m;
delta 2 is the indicated port tube wall thickness, m;
d 1 is the inner diameter of the pump inlet pipeline, m;
D 2 refers to the pump outlet pipe inner diameter, m;
v 1 is the average flow rate of the liquid at the pump inlet, m/s;
v 2 refers to the pump outlet liquid average flow rate, m/s;
z 1 is the vertical distance from the pump inlet pressure measurement point to the horizontal center line of the pump, m;
z 2 refers to the vertical distance from the pump outlet pressure point to the horizontal centerline of the pump, m;
N b refers to pump shaft power (pump input power), kW;
N 1 refers to input power of the three-phase asynchronous motor, and kW;
η d denotes motor operation efficiency, kW;
η c refers to the transmission efficiency.
After 10 independent measurements, the operation efficiency of the water pump unit is calculated to be eta b1,ηb2,.....,ηb10 respectively, and 10 measurements are carried out.
B. Calculating the experimental standard deviation of the running efficiency of the water pump unit by using a Bessel formula,
Wherein:
s (eta b) is the experimental standard deviation of the running efficiency of the water pump unit;
η bj is a measured value of the running efficiency of the water pump, which is obtained by independent measurement at the j th time,%;
Mean value,% > of running efficiency of the water pump obtained by n independent measurements;
C. calculating standard uncertainty component of class A evaluation of operation efficiency of water pump unit
U A(ηd) refers to a standard uncertainty component of the class a assessment of the operation efficiency of the water pump unit;
m refers to the actual number of measurements in each independent measurement.
D. the standard uncertainty introduced by the measurement of the input power N 1 of the three-phase asynchronous motor is calculated as follows:
Wherein:
MPEV N1 refers to the maximum allowable error of the input power N 1 measurement;
E. calculating the standard uncertainty introduced by the inlet liquid average flow rate measurement:
Wherein:
MPEV v1 refers to the maximum allowable error of the inlet liquid average flow rate measurement;
F. calculation of inlet pipe perimeter L 1 measurement introduced standard uncertainty:
Wherein:
MPEV L1 refers to the maximum allowable error measured for the pipe circumference L 1 at the inlet;
G. calculation of the pipe perimeter at outlet L 2 measurement of the introduced standard uncertainty:
Wherein:
MPEV L2 is the maximum allowable error of the pipe circumference L 2 measurement at the point;
H. Calculating the vertical distance z 1 from the inlet pressure point to the horizontal centerline of the pump measures the standard uncertainty introduced:
Wherein:
MPEV z1 refers to the maximum allowable error measured by the vertical distance z 1 from the inlet tap to the horizontal centerline of the pump;
I. Calculating the vertical distance z 2 from the outlet pressure point to the pump horizontal centerline measures the standard uncertainty introduced:
Wherein:
MPEV z2 is the maximum allowable error measured by the vertical distance z 2 from the outlet pressure point to the horizontal centerline of the pump;
J. calculating pump inlet pressure P 1 measurement-introduced standard uncertainty:
Wherein:
MPEV P1 is the maximum allowable error of pump inlet pressure measurement;
J. Calculating pump outlet pressure P 2 measures the standard uncertainty introduced:
Wherein:
MPEV P2 is the maximum allowable error of pump outlet pressure measurement;
J. calculation of inlet pipe wall thickness δ 1 measurement introduced standard uncertainty:
Wherein:
MPEV δ1 is the maximum allowable error of the wall thickness measurement of the inlet pipe;
J. Calculation of outlet pipe wall thickness delta 2 measurement introduced standard uncertainty:
Wherein:
MPEV δ2 is the maximum allowable error of outlet pipe wall thickness measurement;
K. standard uncertainty of the inlet conduit inner diameter D 1 was calculated:
calculating the standard uncertainty of the inner diameter D 2 of the outlet pipeline:
m. standard uncertainty of calculating pump flow Q:
N. calculating the standard uncertainty of the average flow velocity v 2 of the liquid at the outlet of the pump:
Standard uncertainty in calculating motor operating efficiency η d:
P, calculating standard uncertainty of pump shaft power N b:
Calculating the standard uncertainty of the pump static pressure difference delta P:
And R, calculating the standard uncertainty of the pump lift H:
S, calculating the uncertainty of the synthesis standard of the running efficiency of the water pump unit:
the uncertainty of the operation efficiency of the water pump unit relative to the synthesis standard is calculated as follows:
Taking the inclusion factor k=2, the relative expansion uncertainty of the water pump unit operation efficiency is:
Urel(ηb)＝kucrel(ηb)＝3.4％ (40)
Step 3: and collecting operation parameters of a water pump unit driven by the three-phase asynchronous motor, calculating the power consumption of the water pump unit per hundred tons of meters, and evaluating the uncertainty of the power consumption of the water pump unit per hundred tons of meters.
As shown in fig. 4, the evaluation of uncertainty of power consumption of one hundred tons of meters of the water pump unit in step 3 specifically includes:
A. and (3) carrying out 10 independent repeated measurements on a three-phase asynchronous motor with 380V rated voltage, 7.5kW rated power and 87% rated efficiency, and calculating the power consumption of the water pump unit per hundred tons of meters, wherein the power consumption is shown in the following formula:
η＝ηb×ηd×ηg×ηc (42)
Wherein:
e refers to the power consumption of hundreds of tons of meters, kW.h/(t.hm);
η refers to the total efficiency of liquid transport,%;
η b denotes the pump operating efficiency,%;
η d denotes motor operating efficiency,%;
η g denotes the transport efficiency,%;
η c denotes the transmission efficiency,%;
p c is the residual pressure at the backwater end or outlet of the system, pa;
p 2 refers to pump outlet pressure, pa;
B. Calculating the experimental standard deviation of the power consumption of the water pump unit per ton of hundred meters by using a Bessel formula,
Wherein:
s (e) is the experimental standard deviation of the power consumption of the water pump unit in hundred tons and meters;
e j is the power consumption of the water pump measured independently for the jth time, i.e. one hundred tons of meters;
the average power consumption per ton of the water pump unit is obtained by n independent measurements, wherein n=10 in the example;
C. calculating standard uncertainty component of class A evaluation of power consumption of one hundred tons of water pump unit
U A (e) refers to a standard uncertainty component of the class A evaluation of the operation efficiency of the water pump unit;
m refers to the actual number of measurements in each independent measurement.
D. Calculating standard uncertainty of system delivery efficiency
P c is the measurement uncertainty introduced.
E. Calculating standard uncertainty of operation efficiency of water pump unit
F. Standard uncertainty in calculating total efficiency of liquid delivery
G. and (3) calculating the uncertainty of the power consumption synthesis of hundreds of tons of meters:
and calculating uncertainty of power consumption of hundreds of tons of meters relative to a synthesis standard:
Calculating the relative expansion uncertainty of the power consumption of hundreds of tons of meters, taking the inclusion factor k=2:
Urel(e)＝kucrel(e)＝2.6％ (51)
Step 4: and determining the optimal configuration scheme of the water pump unit measuring instrument according to the uncertainty calculation result. The method comprises the following specific steps:
s41: and setting an expected value, evaluating a calculation result according to the uncertainty, respectively comparing the uncertainty of the operation efficiency of the three-phase asynchronous motor for driving the water pump unit, the uncertainty of the operation efficiency of the water pump unit and the uncertainty of the power consumption of the water pump unit, which are measured by the measuring instrument, with the expected value, if the uncertainty is lower than the expected value, the measuring instrument meets the measurement requirement, and if the uncertainty is higher than the expected value, the next step is carried out.
S42: the following measurement quantities are adjusted, including three-phase asynchronous motor current I measurement, three-phase asynchronous motor input power N 1 measurement, inlet liquid average flow speed measurement, inlet pipeline perimeter L 1 measurement and outlet pipeline perimeter L 2 measurement; calculating a vertical distance z 1 measurement of the inlet pressure tap to the pump horizontal centerline, a vertical distance z 2 measurement of the outlet pressure tap to the pump horizontal centerline, a pump inlet pressure P 1 measurement and a pump outlet pressure P 2 measurement, and an inlet conduit wall thickness delta 1 measurement and an outlet conduit wall thickness delta 2 measurement; and for the measured quantity, selecting the accuracy grade of the selected instrument and equipment corresponding to the measured quantity as a median value, inquiring a traceability report of the equipment by the accuracy grade of the instrument and equipment, selecting the accuracy grade higher than and lower than the median value upwards and downwards, calculating the operation efficiency uncertainty of the three-phase asynchronous motor for driving the water pump unit, the operation efficiency uncertainty of the water pump unit and the power consumption uncertainty of the water pump unit, which are used for driving the water pump unit under different accuracy grades of the measured instruments, drawing a curve of 'measured quantity-uncertainty', searching the instrument and equipment with the largest influence on the uncertainty, and simultaneously, considering the cost of the instrument and equipment, and providing an optimal instrument configuration scheme for reducing the uncertainty of the system.
While the applicant has described and illustrated the examples of the present invention in detail with reference to the drawings of the specification, it should be understood by those skilled in the art that the above examples are only preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, but not limiting the scope of the present invention, but any improvements or modifications based on the spirit of the present invention should fall within the scope of the present invention.
Claims (9)
1. The method for evaluating the uncertainty of the energy efficiency measurement of the water pump unit is characterized by comprising the following steps of:
Step 1: collecting operation parameters of a three-phase asynchronous motor, and evaluating the uncertainty of the operation efficiency of the three-phase asynchronous motor; comprising the following steps:
s11: repeatedly measuring the driving three-phase asynchronous motor, and calculating the operation efficiency of the three-phase asynchronous motor for driving the water pump unit;
S12: calculating an experimental standard deviation of the operation efficiency of the three-phase asynchronous motor driven by the water pump unit by using a Bessel formula;
S13: calculating a standard uncertainty component of class A evaluation of the operation efficiency of the three-phase asynchronous motor;
s14: calculating the standard uncertainty introduced by the measurement of the current I of the three-phase asynchronous motor and the standard uncertainty introduced by the current load rate beta of the three-phase asynchronous motor;
s15: calculating the operation efficiency synthesis standard uncertainty of the three-phase asynchronous motor, the operation efficiency relative synthesis standard uncertainty of the three-phase asynchronous motor and the load rate relative expansion uncertainty of the three-phase asynchronous motor according to the uncertainty;
Step 2: collecting operation parameters of a water pump unit driven by a three-phase asynchronous motor, and assessing the uncertainty of the operation efficiency of the water pump unit comprises the following steps:
S21: repeatedly measuring a water pump unit system for driving the three-phase asynchronous motor, and calculating the operation efficiency of the water pump unit;
S22: calculating the experimental standard deviation of the running efficiency of the water pump unit by using a Bessel formula;
S23: calculating a standard uncertainty component of class A evaluation of the running efficiency of the water pump unit;
S24: the method comprises the steps of respectively calculating the standard uncertainty introduced by measuring the input power N 1 of the three-phase asynchronous motor, the standard uncertainty introduced by measuring the average flow velocity of inlet liquid, the standard uncertainty introduced by measuring the perimeter L 1 of the inlet pipeline and the standard uncertainty introduced by measuring the perimeter L 2 of the outlet pipeline;
S25: calculating a standard uncertainty introduced by the inlet pressure measurement to the vertical distance z 1 of the pump horizontal centerline, a standard uncertainty introduced by the outlet pressure measurement to the vertical distance z 2 of the pump horizontal centerline, a standard uncertainty introduced by the pump inlet pressure P 1 measurement, and a standard uncertainty introduced by the pump outlet pressure P 2 measurement, and a standard uncertainty introduced by the inlet conduit wall thickness delta 1 measurement and a standard uncertainty introduced by the outlet conduit wall thickness delta 2 measurement, respectively;
S26: calculating a standard uncertainty of an inlet pipe inner diameter D 1, a standard uncertainty of an outlet pipe inner diameter D 2, a standard uncertainty of a pump flow rate Q, a standard uncertainty of a pump outlet liquid average flow rate v 2, a standard uncertainty of a motor operating efficiency eta d, a standard uncertainty of a pump shaft power N b, a standard uncertainty of a pump static pressure difference delta P and a standard uncertainty of a pump lift H respectively;
s27: calculating the uncertainty of the synthesis standard of the operation efficiency of the water pump unit, the uncertainty of the operation efficiency of the water pump unit relative to the synthesis standard and the uncertainty of the operation efficiency of the water pump unit relative to the expansion uncertainty of the operation efficiency of the water pump unit according to the uncertainty;
step 3: the operation parameters of the water pump unit driven by the three-phase asynchronous motor are collected, the power consumption of the water pump unit per ton of hundred meters is calculated, and the uncertainty of the power consumption of the water pump unit per ton of hundred meters is assessed, and the method comprises the following steps:
s31: repeatedly measuring the driving three-phase asynchronous motor, and calculating the power consumption of the water pump unit in hundreds of tons of meters;
s32: calculating the experimental standard deviation of the power consumption of the water pump unit per ton of hundred meters by using a Bessel formula;
s33: calculating standard uncertainty components of class A evaluation of the power consumption of the water pump unit in hundred tons of meters;
S34: respectively calculating the standard uncertainty of the system conveying efficiency, the standard uncertainty of the operation efficiency of the water pump unit and the standard uncertainty of the total liquid conveying efficiency;
s35: according to the uncertainty, calculating the composite uncertainty of the power consumption of the ton and the hundred meters, the uncertainty of the power consumption of the ton and the hundred meters relative to the composite standard and the uncertainty of the power consumption of the ton and the hundred meters relative to the expansion;
step 4: according to the uncertainty calculation result, determining an optimal configuration scheme of the water pump unit measuring instrument, wherein the optimal configuration scheme comprises the following steps:
s41: setting an expected value, evaluating a calculation result according to uncertainty, respectively comparing the uncertainty of the operation efficiency of the three-phase asynchronous motor for driving the water pump unit, the uncertainty of the operation efficiency of the water pump unit and the uncertainty of the power consumption of the water pump unit, which are hundreds of meters per ton, with the expected value, if the uncertainty is lower than the expected value, enabling the measuring instrument to meet the measurement requirement, and if the uncertainty is higher than the expected value, entering the next step;
S42: the method comprises the steps of adjusting related measurement quantities, selecting the accuracy grade of selected instrument equipment corresponding to the measurement quantities as a median value, selecting the accuracy grade higher than and lower than the median value upwards and downwards, calculating the operation efficiency uncertainty of a three-phase asynchronous motor for driving a water pump unit, the operation efficiency uncertainty of the water pump unit and the uncertainty of the power consumption of the water pump unit in hundred tons of meters under different measurement instrument accuracy grades, drawing a curve of measurement quantity-uncertainty, searching instrument equipment with the largest influence on the uncertainty, and simultaneously, considering the cost of the instrument equipment, and providing an optimal instrument configuration scheme for reducing the uncertainty of a system.
2. The method of claim 1, wherein the correlation measurement comprises: measuring the current I of the three-phase asynchronous motor, measuring the input power N 1 of the three-phase asynchronous motor, measuring the average flow velocity of inlet liquid, measuring the perimeter L 1 of the pipeline at the inlet and measuring the perimeter L 2 of the pipeline at the outlet; the inlet pressure measurement is calculated to be the vertical distance z 1 from the pump horizontal centerline, the outlet pressure measurement is calculated to be the vertical distance z 2 from the pump horizontal centerline, the pump inlet pressure P 1 measurement and the pump outlet pressure P 2 measurement, and the inlet conduit wall thickness delta 1 measurement and the outlet conduit wall thickness delta 2 measurement.
3. A water pump assembly energy efficiency measurement uncertainty assessment device for implementing the method of any one of claims 1-2, comprising:
The three-phase asynchronous motor operation efficiency uncertainty evaluation module is used for collecting operation parameters of the three-phase asynchronous motor and evaluating the operation efficiency uncertainty of the three-phase asynchronous motor;
the water pump unit operation efficiency uncertainty evaluation module is used for collecting operation parameters of a water pump unit driven by the three-phase asynchronous motor and evaluating the operation efficiency uncertainty of the water pump unit;
The system comprises a water pump unit ton and hundred-meter power consumption uncertainty evaluation module, a three-phase asynchronous motor and a three-phase asynchronous motor, wherein the water pump unit ton and hundred-meter power consumption uncertainty evaluation module is used for collecting operation parameters of the water pump unit driven by the three-phase asynchronous motor, calculating the ton and hundred-meter power consumption of the water pump unit and evaluating the ton and hundred-meter power consumption uncertainty of the water pump unit;
and the optimal configuration scheme selection module is used for determining the optimal configuration scheme of the water pump unit measuring instrument according to the uncertainty calculation result.
4. The apparatus of claim 3, wherein the device comprises a plurality of sensors,
The three-phase asynchronous motor operation efficiency uncertainty evaluation module is used for repeatedly measuring the driving three-phase asynchronous motor, calculating the three-phase asynchronous motor operation efficiency driven by the water pump unit, the experimental standard deviation of the three-phase asynchronous motor operation efficiency driven by the water pump unit, the standard uncertainty component for evaluating the three-phase asynchronous motor operation efficiency A class, the standard uncertainty introduced by the three-phase asynchronous motor current I measurement and the standard uncertainty introduced by the three-phase asynchronous motor current load rate beta; and calculating the uncertainty of the synthesis standard of the operating efficiency of the three-phase asynchronous motor, the uncertainty of the relative synthesis standard of the operating efficiency of the three-phase asynchronous motor and the uncertainty of the relative expansion of the load rate of the three-phase asynchronous motor according to the uncertainty.
5. The apparatus of claim 4, wherein the device comprises a plurality of sensors,
The water pump unit operation efficiency uncertainty evaluation module is used for repeatedly measuring a water pump unit system for driving the three-phase asynchronous motor, and calculating the water pump unit operation efficiency, the experimental standard deviation of the water pump unit operation efficiency and the standard uncertainty component of the water pump unit operation efficiency class A evaluation; the method comprises the steps of respectively calculating the standard uncertainty introduced by measuring the input power N 1 of the three-phase asynchronous motor, the standard uncertainty introduced by measuring the average flow velocity of inlet liquid, the standard uncertainty introduced by measuring the perimeter L 1 of the inlet pipeline and the standard uncertainty introduced by measuring the perimeter L 2 of the outlet pipeline; calculating an introduced standard uncertainty of the inlet pressure measurement to the vertical distance z 1 of the pump horizontal centerline, an introduced standard uncertainty of the outlet pressure measurement to the vertical distance z 2 of the pump horizontal centerline, an introduced standard uncertainty of the pump inlet pressure P 1 measurement and an introduced standard uncertainty of the pump outlet pressure P 2 measurement, and an introduced standard uncertainty of the inlet conduit wall thickness delta 1 measurement and an introduced standard uncertainty of the outlet conduit wall thickness delta 2 measurement; calculating a standard uncertainty of the inlet pipe inner diameter D 1, a standard uncertainty of the outlet pipe inner diameter D 2, a standard uncertainty of the pump flow rate Q, a standard uncertainty of the pump outlet liquid average flow rate v 2, a standard uncertainty of the motor operating efficiency η d, a standard uncertainty of the pump shaft power N b, a standard uncertainty of the calculated pump static pressure difference Δp, and a standard uncertainty of the pump head H; and calculating the uncertainty of the synthesis standard of the operation efficiency of the water pump unit, the uncertainty of the operation efficiency of the water pump unit relative to the synthesis standard and the uncertainty of the operation efficiency of the water pump unit relative to the expansion uncertainty of the operation efficiency of the water pump unit according to the uncertainty.
6. The apparatus of claim 5, wherein the device comprises a plurality of sensors,
The uncertainty evaluation module for the power consumption of the water pump unit in hundred tons of meters is used for repeatedly measuring the driving three-phase asynchronous motor and calculating the experimental standard deviation of the power consumption of the water pump unit in hundred tons of meters and the standard uncertainty component of class A evaluation of the power consumption of the water pump unit in hundred tons of meters; calculating the standard uncertainty of the system conveying efficiency, the standard uncertainty of the operation efficiency of the water pump unit and the standard uncertainty of the total liquid conveying efficiency; and then, according to the uncertainty, calculating the composite uncertainty of the power consumption of the ton and the hundred meters, the uncertainty of the power consumption of the ton and the hundred meters relative to the composite standard and the uncertainty of the power consumption of the ton and the hundred meters relative to the expansion.
7. The apparatus of claim 6, wherein the optimal configuration selection module sets an expected value, evaluates a calculation result according to uncertainty, compares an operation efficiency uncertainty of the three-phase asynchronous motor for driving the water pump unit, an operation efficiency uncertainty of the water pump unit and a power consumption uncertainty of one hundred tons of meters of the water pump unit with the expected values respectively, and if the operation efficiency uncertainty is lower than the expected value, meets a measurement requirement, and if the operation efficiency is higher than the expected value, adjusts the following measurement quantities, including three-phase asynchronous motor current I measurement, three-phase asynchronous motor input power N 1 measurement, inlet liquid average flow rate measurement, inlet pipeline perimeter L 1 measurement and outlet pipeline perimeter L 2 measurement; calculating a vertical distance z 1 measurement of the inlet pressure tap to the pump horizontal centerline, a vertical distance z 2 measurement of the outlet pressure tap to the pump horizontal centerline, a pump inlet pressure P 1 measurement and a pump outlet pressure P 2 measurement, and an inlet conduit wall thickness delta 1 measurement and an outlet conduit wall thickness delta 2 measurement; and for the measured quantity, selecting the accuracy grade of the selected instrument and equipment corresponding to the measured quantity as a median value, inquiring a traceability report of the equipment by the accuracy grade of the instrument and equipment, selecting the accuracy grade higher than and lower than the median value upwards and downwards, calculating the operation efficiency uncertainty of the three-phase asynchronous motor for driving the water pump unit, the operation efficiency uncertainty of the water pump unit and the power consumption uncertainty of the water pump unit, which are used for driving the water pump unit under different accuracy grades of the measured instruments, drawing a curve of 'measured quantity-uncertainty', searching the instrument and equipment with the largest influence on the uncertainty, and simultaneously, considering the cost of the instrument and equipment, and providing an optimal instrument configuration scheme for reducing the uncertainty of the system.
8. A terminal, comprising a processor and a storage medium;
the storage medium is used for storing instructions;
the processor being operative according to the instructions to perform the steps of the method according to any one of claims 1-2.
9. Computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the steps of the method according to any of claims 1-2.
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