CN113901603A - Water pump unit energy efficiency measurement uncertainty evaluation method and device - Google Patents

Water pump unit energy efficiency measurement uncertainty evaluation method and device Download PDF

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CN113901603A
CN113901603A CN202111136297.0A CN202111136297A CN113901603A CN 113901603 A CN113901603 A CN 113901603A CN 202111136297 A CN202111136297 A CN 202111136297A CN 113901603 A CN113901603 A CN 113901603A
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uncertainty
water pump
pump unit
measuring
asynchronous motor
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CN113901603B (en
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陆婋泉
陈铭明
左强
杨世海
苏慧玲
瞿亚运
张驰
陈宇沁
黄艺璇
程含渺
刘恬畅
方凯杰
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State Grid Jiangsu Electric Power Co ltd Marketing Service Center
State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
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State Grid Jiangsu Electric Power Co ltd Marketing Service Center
State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
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Abstract

The invention provides a method and a device for evaluating uncertainty of energy efficiency measurement of a water pump unit driven by a three-phase asynchronous motor, and provides a method for evaluating uncertainty of energy efficiency measurement of a water pump unit driven by the three-phase asynchronous motor, a method for calculating operation efficiency of the three-phase asynchronous motor driven by the water pump unit and evaluating uncertainty of the three-phase asynchronous motor driven by the water pump unit, a method for evaluating uncertainty of operation efficiency of the water pump unit and evaluating uncertainty of power consumption of the water pump unit per ton and hundred meters, and influences of maximum allowable errors, accuracy grades and stability of measuring instrument equipment on the energy efficiency measurement result of the water pump unit are quantified according to the calculation result of the uncertainty. When the uncertainty result can not meet the requirements of users, the uncertainty influence introduced by the measurement of each instrument can be reversely deduced, so that the most serious component of the influence on the result is found, the optimal instrument configuration scheme is provided for reducing the uncertainty of the system, and the rapid increase of the manufacturing cost of the measurement system caused by excessive pursuit of a single index is avoided.

Description

Water pump unit energy efficiency measurement uncertainty evaluation method and device
Technical Field
The invention relates to the technical field of energy efficiency measurement of energy utilization equipment, in particular to an uncertainty evaluation method for energy efficiency measurement of a water pump unit driven by a three-phase asynchronous motor.
Background
The water pump unit is a high-energy-consumption device, 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 needs to evaluate the uncertainty of the energy efficiency measurement of the water pump unit, the uncertainty range of the measurement error of the measurement system is determined, and the stability of the measurement system is ensured.
However, the prior art fails to provide an uncertainty evaluation method for energy efficiency measurement of 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 determining 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:
a method for evaluating uncertainty of energy efficiency measurement of a water pump unit comprises the following steps:
step 1: collecting the 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 uncertainty of operation efficiency of the water pump unit;
and step 3: collecting operating parameters of a water pump unit driven by a three-phase asynchronous motor, calculating the power consumption of the water pump unit per ton and hundred meters, and evaluating the uncertainty of the power consumption of the water pump unit per ton and hundred meters;
and 4, 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 comprises:
s11: repeatedly measuring the driving three-phase asynchronous motor, and calculating the running efficiency of the three-phase asynchronous motor for driving the water pump unit;
s12: calculating the experimental standard deviation of the running efficiency of the three-phase asynchronous motor for driving the water pump unit by using a Bessel formula;
s13: calculating a standard uncertainty component of A-type evaluation of the running efficiency of the three-phase asynchronous motor;
s14: calculating standard uncertainty introduced by measuring the current I of the three-phase asynchronous motor and standard uncertainty introduced by the current load rate beta of the three-phase asynchronous motor;
s15: and calculating the synthetic standard uncertainty of the running efficiency of the three-phase asynchronous motor, the relative synthetic standard uncertainty of the running efficiency of the three-phase asynchronous motor and the relative expansion uncertainty of the load rate of the three-phase asynchronous motor 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 operating efficiency of the water pump unit by using a Bessel formula;
s23: calculating a standard uncertainty component of the A-type evaluation of the operating efficiency of the water pump unit;
s24: respectively calculating the input power N of the three-phase asynchronous motor1Measuring the standard uncertainty introduced, measuring the average flow rate of the liquid at the inlet, and measuring the perimeter L of the pipe at the inlet1Measuring the introduced standard uncertainty, the perimeter L of the pipe at the outlet2Measuring the introduced standard uncertainty;
s25: respectively calculating the vertical distance z between the inlet pressure measuring point and the horizontal central line of the pump1Measuring the standard uncertainty introduced, the vertical distance z from the outlet pressure-measuring point to the horizontal centre line of the pump2Measuring the introduced standard uncertainty, pump inlet pressure P1Measuring the introduced standard uncertainty and the pump outlet pressure P2Measuring the standard uncertainty introduced, and the inlet duct wall thickness delta1Measuring the incoming standard uncertainty and outlet pipe wall thickness delta2Measuring the introduced standard uncertainty;
s26: respectively calculating the inner diameters D of the inlet pipelines1Standard uncertainty, outlet pipe internal diameter D2Standard uncertainty of (d), standard uncertainty of pump flow Q, pump outlet liquid average flow velocity v2Standard uncertainty, motor operating efficiency etadStandard uncertainty, pump shaft power NbThe standard uncertainty of the pump head, the standard uncertainty of the pump static pressure difference delta P and the standard uncertainty of the pump head H;
s27: and calculating the uncertainty of the synthetic standard of the operation efficiency of the water pump unit, the uncertainty of the relative synthetic standard of the operation efficiency of the water pump unit and the uncertainty of the relative expansion of the operation efficiency of the water pump unit according to the uncertainty.
Preferably, the step 3 comprises:
s31: repeatedly measuring the driving three-phase asynchronous motor, and calculating the power consumption of the water pump unit per ton and hundred meters;
s32: calculating the experimental standard deviation of the power consumption of the water pump unit per ton and hundred meters by using a Bessel formula;
s33: calculating the standard uncertainty component of class A evaluation of the water pump unit power consumption per ton and hundred meters;
s34: respectively calculating the standard uncertainty of the system conveying efficiency, the standard uncertainty of the water pump unit operating efficiency and the standard uncertainty of the total liquid conveying efficiency;
s35: and calculating the synthetic uncertainty of the power consumption of one ton and one hundred meters, the uncertainty of the power consumption of one ton and one hundred meters relative to the synthetic standard and the uncertainty of the power consumption of one ton and one hundred meters relative to the expansion according to the uncertainty.
Preferably, the step 4 comprises:
s41: setting an expected value, respectively comparing the uncertainty of the operating efficiency of the three-phase asynchronous motor for driving the water pump unit, the uncertainty of the operating efficiency of the water pump unit and the uncertainty of the power consumption of the water pump unit per ton and hundred meters with the expected value according to the uncertainty evaluation calculation result, 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: adjusting related measurement quantity, selecting the accuracy grade of selected instrument equipment corresponding to the measurement quantity as a median, selecting the accuracy grade higher than and lower than the median upwards and downwards, calculating the uncertainty of the operating efficiency of the three-phase asynchronous motor for driving the water pump unit, the uncertainty of the operating efficiency of the water pump unit and the uncertainty of the power consumption of the water pump unit in different accuracy grades of the measurement instrument, drawing a 'measurement quantity-uncertainty' curve, searching the instrument equipment with the largest influence on the uncertainty, and simultaneously considering the cost of the instrument equipment, providing an optimal instrument configuration scheme for reducing the uncertainty of the system.
Preferably, the relevant measurement quantities include: current I measurement of three-phase asynchronous motor, input power N of three-phase asynchronous motor1Measurement, measurement of average flow velocity of liquid at inlet, and perimeter L of pipe at inlet1Measuring, outlet pipe perimeter L2Measuring; calculating the vertical distance z between the inlet pressure measuring point and the horizontal central line of the pump1Measuring the vertical distance z from the outlet pressure measuring point to the horizontal central line of the pump2Measuring, pump inlet pressure P1Measuring and pump outlet pressure P2Measurement, and inlet duct wall thickness delta1Measuring and outlet pipe wall thickness delta2And (6) measuring.
The invention also provides a water pump unit energy efficiency measurement uncertainty evaluation device, which is used for realizing the method of the invention and comprises the following steps:
the uncertainty evaluation module of the running efficiency of the three-phase asynchronous motor is used for acquiring the running parameters of the three-phase asynchronous motor and evaluating the uncertainty of the running efficiency of the three-phase asynchronous motor;
the water pump unit operation efficiency uncertainty evaluation module is used for acquiring 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;
the water pump unit one-ton one-hundred-meter power consumption uncertainty evaluation module is used for acquiring operation parameters of a water pump unit driven by a three-phase asynchronous motor, calculating the one-ton one-hundred-meter power consumption of the water pump unit and evaluating the uncertainty of the one-ton one-hundred-meter power consumption 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 present invention provides a terminal, including a processor and a storage medium; the storage medium is used for storing instructions; the processor is configured to operate in accordance with the instructions to perform the steps of the method of the present invention.
Further, the invention proposes a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to the invention.
Compared with the prior art, the invention has the beneficial effects that:
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 operating efficiency of a three-phase asynchronous motor driven by a water pump unit and evaluating the uncertainty of the three-phase asynchronous motor, a method for evaluating the uncertainty of the operating efficiency of the water pump unit and a method for evaluating the uncertainty of the power consumption of the water pump unit per ton and hundred meters.
According to the calculation results of the uncertainty of the operating efficiency of the three-phase asynchronous motor for driving the water pump unit, the uncertainty of the operating efficiency of the water pump unit and the uncertainty of the power consumption of the water pump unit per ton and hundred meters, the influences of the maximum allowable error, the accuracy grade and the stability of the measuring instrument on the energy efficiency measuring result of the water pump unit can be quantified. When the uncertainty result can not meet the requirements of users, the uncertainty influence introduced by the measurement of each instrument can be reversely deduced, so that the most serious component of the influence on the result is found, the optimal instrument configuration scheme is provided for reducing the uncertainty of the system, and the rapid increase of the manufacturing cost of the measurement system caused by excessive pursuit of a single index is avoided.
Drawings
FIG. 1 is a flow chart of an evaluation method for uncertainty of energy efficiency measurement of a water pump unit driven by a three-phase asynchronous motor;
FIG. 2 is a flow chart for evaluating uncertainty of operation efficiency of a three-phase asynchronous motor driven by a water pump set;
FIG. 3 is a flow chart of a method for evaluating uncertainty of operating efficiency of a water pump unit;
fig. 4 is a flow chart of a method for evaluating uncertainty of power consumption of a water pump unit per ton and hundred meters.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.
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 uncertainty of a measurement system during energy efficiency measurement of the water pump unit driven by the three-phase asynchronous motor.
As shown in fig. 1, the method for evaluating uncertainty of energy efficiency measurement of a water pump unit driven by a three-phase asynchronous motor according to the present invention includes:
step 1: collecting the 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 uncertainty of operation efficiency of a three-phase asynchronous motor driven by a water pump unit, and specifically includes:
A. 10 independent repeated measurements are carried out on the driving three-phase asynchronous motor with the rated voltage of 380V, the rated power of 7.5kW and the rated efficiency of 87%, and the running efficiency of the three-phase asynchronous motor for driving the water pump unit is calculated, wherein the running efficiency is shown as the following formula:
Figure BDA0003282145930000061
wherein:
Figure BDA0003282145930000071
in the formula:
ηdthe running efficiency of a three-phase asynchronous motor for driving a water pump unit is percent;
ηemeans rated motor efficiency,%;
beta means current load rate,%, of the three-phase asynchronous motor;
Iethe rated current of the three-phase asynchronous motor is A;
i refers to the real-time current of the three-phase asynchronous motor, A.
After 10 times of independent measurement, the running efficiency of the three-phase asynchronous motor for driving the water pump unit is calculated to be eta respectivelyd1,ηd2,.....,ηd10And 10 times are the number of measurements.
B. The experimental standard deviation of the running efficiency of the three-phase asynchronous motor for driving the water pump set is calculated by a Bessel formula,
Figure BDA0003282145930000072
in the formula:
s(ηd) The standard deviation is the experimental standard deviation of the running efficiency of the three-phase asynchronous motor;
ηdjthe measured value of the running efficiency of the three-phase asynchronous motor is obtained by the jth independent measurement;
Figure BDA0003282145930000073
the average value of the running efficiency of the three-phase asynchronous motor is obtained by n times of independent measurement, wherein n is 10 in the example;
C. calculating standard uncertainty component of A-type evaluation of running efficiency of three-phase asynchronous motor
Figure BDA0003282145930000074
uA(ηd) The standard uncertainty component refers to the A-type evaluation of the running efficiency of the three-phase asynchronous motor;
m refers to the actual number of measurements in each individual measurement.
D. Calculating standard uncertainty introduced by measuring current I of three-phase asynchronous motor
The standard uncertainty introduced by the current I measurement of the three-phase asynchronous motor is expressed as
Figure BDA0003282145930000081
In the formula:
MPEVCPthe maximum allowable error of a current test equipment probe is referred to;
MPEVCthe maximum allowable error of the current testing equipment body is defined;
E. calculating standard uncertainty introduced by current load rate beta of three-phase asynchronous motor
Figure BDA0003282145930000082
F. Calculating the uncertainty of the synthetic standard of the running efficiency of the three-phase asynchronous motor:
Figure BDA0003282145930000083
calculating the uncertainty of the relative synthesis standard of the operating efficiency of the three-phase asynchronous motor as follows:
Figure BDA0003282145930000084
calculating the uncertainty of the relative expansion of the load factor of the three-phase asynchronous motor as follows:
Urel(ηd)＝kucrel(ηd)＝0.52％ (9)
in the formula:
k is an inclusion factor.
Step 2: collecting the operating parameters of a water pump unit driven by a three-phase asynchronous motor, and evaluating the uncertainty of the operating efficiency of the water pump unit.
As shown in fig. 3, step 2, evaluating uncertainty of operating efficiency of the water pump unit 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 the rated voltage of 380V, the rated power of 7.5kW and the rated efficiency of 87 percent, and the calculation formula of the operating efficiency of the water pump unit is shown as follows
Figure BDA0003282145930000091
Wherein
Figure BDA0003282145930000097
Figure BDA0003282145930000092
Figure BDA0003282145930000093
Figure BDA0003282145930000094
Figure BDA0003282145930000095
Figure BDA0003282145930000096
Nb＝N1×ηd×ηc (17)
In the formula:
ηbthe operating efficiency of the water pump unit is percent;
rho means the liquid density, kg/m3；
g is a gravitational constant, m/s2；
Q is the flow rate of the pump, m3/h；
H is pump head, m;
Δ p means pump static pressure difference, m;
P1refers to pump inlet pressure, Pa;
P2refers to pump outlet pressure, Pa;
L1means the perimeter of the pipeline at the inlet, m;
L2refers to the perimeter of the pipeline at the outlet, m;
δ1refers to the inlet pipe wall thickness, m;
δ2refers to the outlet pipe wall thickness, m;
D1refers to the inner diameter of the inlet pipeline of the pump, m;
D2refers to the pump outlet pipe inner diameter, m;
v1the average flow speed of liquid at the inlet of the pump is m/s;
v2mean pump outlet liquid average flow velocity, m/s;
z1is the vertical distance, m, from the pressure measuring point at the inlet of the pump to the horizontal center line of the pump;
z2the vertical distance m between a pump outlet pressure measuring point and a horizontal center line of the pump;
Nbmeans pump shaft power (pump input power), kW;
N1the method is characterized in that the input power of a three-phase asynchronous motor is kW;
ηdmeans the motor operating efficiency, kW;
ηcrefers to the transmission efficiency.
After 10 times of independent measurement, the operating efficiency of the water pump unit is calculated to be eta respectivelyb1,ηb2,.....,ηb10And 10 times are the number of measurements.
B. Calculating the experimental standard deviation of the operating efficiency of the water pump unit by using a Bessel formula,
Figure BDA0003282145930000101
in the formula:
s(ηb) The method is the experimental standard deviation of the operating efficiency of the water pump unit;
ηbjmeans the operation efficiency of the water pump obtained by the jth independent measurementFound,%;
Figure BDA0003282145930000111
the average value,%, of the running efficiency of the water pump is obtained by n times of independent measurement;
C. calculating standard uncertainty component for A-type evaluation of operating efficiency of water pump unit
Figure BDA0003282145930000112
uA(ηd) The component is the standard uncertainty component of the A-type evaluation of the operating efficiency of the water pump unit;
m refers to the actual number of measurements in each individual measurement.
D. Calculating input power N of three-phase asynchronous motor1The standard uncertainty introduced by the measurement is:
Figure BDA0003282145930000113
in the formula:
MPEVN1is the input power N1Maximum allowable error of measurement;
E. calculating the standard uncertainty introduced by the average inlet liquid flow rate measurement:
Figure BDA0003282145930000114
in the formula:
MPEVv1refers to the maximum allowable error of the average flow rate measurement of the inlet liquid;
F. calculating the perimeter L of the pipeline at the inlet1Standard uncertainty introduced by the measurement:
Figure BDA0003282145930000115
in the formula:
MPEVL1refers to the circumference L of the pipeline at the inlet1Maximum allowable error of measurement;
G. calculating the perimeter L of the pipeline at the opening2Standard uncertainty introduced by the measurement:
Figure BDA0003282145930000116
in the formula:
MPEVL2refers to the perimeter L of the pipeline at the outlet2Maximum allowable error of measurement;
H. calculating the vertical distance z between the inlet pressure measuring point and the horizontal central line of the pump1Standard uncertainty introduced by the measurement:
Figure BDA0003282145930000121
in the formula:
MPEVz1is the vertical distance z from the inlet pressure measuring point to the horizontal center line of the pump1Maximum allowable error of measurement;
I. calculating the vertical distance z between the outlet pressure measuring point and the horizontal central line of the pump2Standard uncertainty introduced by the measurement:
Figure BDA0003282145930000122
in the formula:
MPEVz2is the vertical distance z from the outlet pressure measuring point to the horizontal center line of the pump2Maximum allowable error of measurement;
J. calculating the Pump Inlet pressure P1Standard uncertainty introduced by the measurement:
Figure BDA0003282145930000123
in the formula:
MPEVP1is the maximum allowable error of the pump inlet pressure measurement;
J. calculating pump outlet pressure P2Standard uncertainty introduced by the measurement:
Figure BDA0003282145930000124
in the formula:
MPEVP2is the maximum allowable error of pump outlet pressure measurement;
J. calculating the wall thickness delta of the inlet pipe1Standard uncertainty introduced by the measurement:
Figure BDA0003282145930000131
in the formula:
MPEVδ1is the maximum allowable error of the wall thickness measurement of the inlet pipe;
J. calculating the wall thickness delta of the outlet pipe2Standard uncertainty introduced by the measurement:
Figure BDA0003282145930000132
in the formula:
MPEVδ2is the maximum allowable error of outlet pipe wall thickness measurement;
K. calculating the inner diameter D of the inlet pipe1Standard uncertainty of (d):
Figure BDA0003282145930000133
l. calculating the inner diameter D of the outlet pipeline2Standard uncertainty of (d):
Figure BDA0003282145930000134
calculating the standard uncertainty of the flow Q of the pump:
Figure BDA0003282145930000135
n. calculating average flow velocity v of liquid at pump outlet2Standard uncertainty:
Figure BDA0003282145930000136
calculating the motor operating efficiency etadStandard uncertainty of (d):
Figure BDA0003282145930000141
p. calculating pump shaft power NbStandard uncertainty of (d):
Figure BDA0003282145930000142
calculating the standard uncertainty of the pump static pressure difference delta P:
Figure BDA0003282145930000143
r. calculating the standard uncertainty of the pump head H:
Figure BDA0003282145930000144
s, calculating the uncertainty of the synthetic standard of the operating efficiency of the water pump unit:
Figure BDA0003282145930000145
calculating the uncertainty of the operating efficiency of the water pump unit relative to a synthetic standard as follows:
Figure BDA0003282145930000146
and if the k containing factor is 2, the uncertainty of the relative expansion of the operation efficiency of the water pump unit is as follows:
Urel(ηb)＝kucrel(ηb)＝3.4％ (40)
and step 3: collecting the operating parameters of a water pump unit driven by a three-phase asynchronous motor, calculating the power consumption of the water pump unit per ton and hundred meters, and evaluating the uncertainty of the power consumption of the water pump unit per ton and hundred meters.
As shown in fig. 4, step 3 is to evaluate uncertainty of the water pump unit power consumption per ton and hundred meters, and specifically includes:
A. 10 independent repeated measurements are carried out on a driving three-phase asynchronous motor with the rated voltage of 380V, the rated power of 7.5kW and the rated efficiency of 87%, and the power consumption of the water pump unit per ton and hundred meters is calculated, wherein the power consumption is shown as the following formula:
Figure BDA0003282145930000147
η＝ηb×ηd×ηg×ηc (42)
Figure BDA0003282145930000151
in the formula:
e is the power consumption per hectometer, kW.h/(t.hm);
η means total efficiency,%;
ηbmeans pump operating efficiency,%;
ηdmeans motor operating efficiency,%;
ηgmeans transport efficiency,%;
ηcmeans transmission efficiency,%;
pcrefers to the residual pressure at the tail end or the outlet of the backwater of the systemForce, Pa;
p2refers to pump outlet pressure, Pa;
B. calculating the experimental standard deviation of the power consumption of the water pump unit per ton and hundred meters by using a Bessel formula,
Figure BDA0003282145930000152
in the formula:
s (e) is the experimental standard deviation of the power consumption of the water pump unit per ton and per hundred meters;
ejthe power consumption of the water pump per ton and hundred meters is measured independently in the jth time;
Figure BDA0003282145930000153
the average power consumption per ton and hundred meters of the water pump unit is obtained by n times of independent measurement, wherein n is 10 in the example;
C. calculating standard uncertainty component of class A evaluation of water pump unit power consumption per ton and hundred meters
Figure BDA0003282145930000154
uA(e) The component is the standard uncertainty component of the A-type evaluation of the operating efficiency of the water pump unit;
m refers to the actual number of measurements in each individual measurement.
D. Calculating standard uncertainty of system transport efficiency
Figure BDA0003282145930000161
PcIs the introduced measurement uncertainty.
E. Calculating standard uncertainty of operating efficiency of water pump unit
Figure BDA0003282145930000162
F. Calculating standard uncertainty of total efficiency of liquid delivery
Figure BDA0003282145930000163
G. Calculating the synthetic uncertainty of the power consumption per ton and hundred meters:
Figure BDA0003282145930000164
calculating the uncertainty of the power consumption per hectometer relative to the synthetic standard:
Figure BDA0003282145930000165
and calculating the uncertainty of the relative expansion of the power consumption per ton and hectometer, and taking a factor k as 2:
Urel(e)＝kucrel(e)＝2.6％ (51)
and 4, 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, respectively comparing the uncertainty of the operating efficiency of the three-phase asynchronous motor for driving the water pump unit, the uncertainty of the operating efficiency of the water pump unit and the uncertainty of the power consumption of the water pump unit per ton and hundred meters with the expected value according to the uncertainty evaluation calculation result, 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: adjusting the following measurement variables, including current I measurement of three-phase asynchronous motor, input power N of three-phase asynchronous motor1Measurement, measurement of average flow velocity of liquid at inlet, and perimeter L of pipe at inlet1Measuring, outlet pipe perimeter L2Measuring; calculating the vertical distance z between the inlet pressure measuring point and the horizontal central line of the pump1Measuring the vertical distance z from the outlet pressure measuring point to the horizontal central line of the pump2Measuring, pump inlet pressure P1Measuring and pump outlet pressure P2Measurement, and inlet duct wall thickness delta1Measuring and outlet pipe wall thickness delta2Measuring; for the measured quantity, the selected instrument and equipment accuracy grade corresponding to the measured quantity is selected as a median, the instrument and equipment accuracy grade inquires the equipment traceability report to obtain, the accuracy grade higher than and lower than the median is selected upwards and downwards, the operating efficiency uncertainty of the three-phase asynchronous motor for driving the water pump unit, the operating efficiency uncertainty of the water pump unit and the uncertainty of the water pump unit in ton and hundred meter power consumption under different measuring instrument accuracy grades are calculated, a 'measured quantity-uncertainty' curve is drawn, the instrument and equipment with the largest influence on the uncertainty are searched, meanwhile, the cost of the instrument and equipment is considered, and the optimal instrument configuration scheme for reducing the system uncertainty is provided.
While the best mode for carrying out the invention has been described in detail and illustrated in the accompanying drawings, it is to be understood that the same is by way of illustration and example only and is not to be taken by way of limitation, the scope of the invention should be determined by the appended claims and any changes or modifications which fall within the true spirit and scope of the invention should be construed as broadly described herein.

Claims (13)

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 the 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 uncertainty of operation efficiency of the water pump unit;
and step 3: collecting operating parameters of a water pump unit driven by a three-phase asynchronous motor, calculating the power consumption of the water pump unit per ton and hundred meters, and evaluating the uncertainty of the power consumption of the water pump unit per ton and hundred meters;
and 4, step 4: and determining the optimal configuration scheme of the water pump unit measuring instrument according to the uncertainty calculation result.
2. The method of claim 1, wherein step 1 comprises:
s11: repeatedly measuring the driving three-phase asynchronous motor, and calculating the running efficiency of the three-phase asynchronous motor for driving the water pump unit;
s12: calculating the experimental standard deviation of the running efficiency of the three-phase asynchronous motor for driving the water pump unit by using a Bessel formula;
s13: calculating a standard uncertainty component of A-type evaluation of the running efficiency of the three-phase asynchronous motor;
s14: calculating standard uncertainty introduced by measuring the current I of the three-phase asynchronous motor and standard uncertainty introduced by the current load rate beta of the three-phase asynchronous motor;
s15: and calculating the synthetic standard uncertainty of the running efficiency of the three-phase asynchronous motor, the relative synthetic standard uncertainty of the running efficiency of the three-phase asynchronous motor and the relative expansion uncertainty of the load rate of the three-phase asynchronous motor according to the uncertainty.
3. The method of claim 2, wherein step 2 comprises:
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 operating efficiency of the water pump unit by using a Bessel formula;
s23: calculating a standard uncertainty component of the A-type evaluation of the operating efficiency of the water pump unit;
s24: respectively calculating the input power N of the three-phase asynchronous motor1Measuring the standard uncertainty introduced, measuring the average flow rate of the liquid at the inlet, and measuring the perimeter L of the pipe at the inlet1Measuring the introduced standard uncertainty, the perimeter L of the pipe at the outlet2Measuring the introduced standard uncertainty;
s25: respectively calculating the vertical distance z between the inlet pressure measuring point and the horizontal central line of the pump1Measuring the standard uncertainty introduced, the outlet pressure-measuring point to the horizontal central line of the pumpIs perpendicular to the plane of the plane2Measuring the introduced standard uncertainty, pump inlet pressure P1Measuring the introduced standard uncertainty and the pump outlet pressure P2Measuring the standard uncertainty introduced, and the inlet duct wall thickness delta1Measuring the incoming standard uncertainty and outlet pipe wall thickness delta2Measuring the introduced standard uncertainty;
s26: respectively calculating the inner diameters D of the inlet pipelines1Standard uncertainty, outlet pipe internal diameter D2Standard uncertainty of (d), standard uncertainty of pump flow Q, pump outlet liquid average flow velocity v2Standard uncertainty, motor operating efficiency etadStandard uncertainty, pump shaft power NbThe standard uncertainty of the pump head, the standard uncertainty of the pump static pressure difference delta P and the standard uncertainty of the pump head H;
s27: and calculating the uncertainty of the synthetic standard of the operation efficiency of the water pump unit, the uncertainty of the relative synthetic standard of the operation efficiency of the water pump unit and the uncertainty of the relative expansion of the operation efficiency of the water pump unit according to the uncertainty.
4. The method of claim 1, wherein step 3 comprises:
s31: repeatedly measuring the driving three-phase asynchronous motor, and calculating the power consumption of the water pump unit per ton and hundred meters;
s32: calculating the experimental standard deviation of the power consumption of the water pump unit per ton and hundred meters by using a Bessel formula;
s33: calculating the standard uncertainty component of class A evaluation of the water pump unit power consumption per ton and hundred meters;
s34: respectively calculating the standard uncertainty of the system conveying efficiency, the standard uncertainty of the water pump unit operating efficiency and the standard uncertainty of the total liquid conveying efficiency;
s35: and calculating the synthetic uncertainty of the power consumption of one ton and one hundred meters, the uncertainty of the power consumption of one ton and one hundred meters relative to the synthetic standard and the uncertainty of the power consumption of one ton and one hundred meters relative to the expansion according to the uncertainty.
5. The method of claim 4, wherein the step 4 comprises:
s41: setting an expected value, respectively comparing the uncertainty of the operating efficiency of the three-phase asynchronous motor for driving the water pump unit, the uncertainty of the operating efficiency of the water pump unit and the uncertainty of the power consumption of the water pump unit per ton and hundred meters with the expected value according to the uncertainty evaluation calculation result, 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: adjusting related measurement quantity, selecting the accuracy grade of selected instrument equipment corresponding to the measurement quantity as a median, selecting the accuracy grade higher than and lower than the median upwards and downwards, calculating the uncertainty of the operating efficiency of the three-phase asynchronous motor for driving the water pump unit, the uncertainty of the operating efficiency of the water pump unit and the uncertainty of the power consumption of the water pump unit in different accuracy grades of the measurement instrument, drawing a 'measurement quantity-uncertainty' curve, searching the instrument equipment with the largest influence on the uncertainty, and simultaneously considering the cost of the instrument equipment, providing an optimal instrument configuration scheme for reducing the uncertainty of the system.
6. The method of claim 5, wherein the correlating measurements comprises: current I measurement of three-phase asynchronous motor, input power N of three-phase asynchronous motor1Measurement, measurement of average flow velocity of liquid at inlet, and perimeter L of pipe at inlet1Measuring, outlet pipe perimeter L2Measuring; calculating the vertical distance z between the inlet pressure measuring point and the horizontal central line of the pump1Measuring the vertical distance z from the outlet pressure measuring point to the horizontal central line of the pump2Measuring, pump inlet pressure P1Measuring and pump outlet pressure P2Measurement, and inlet duct wall thickness delta1Measuring and outlet pipe wall thickness delta2And (6) measuring.
7. An uncertainty assessment device for water pump unit energy efficiency measurement, which is used for implementing the method according to claims 1-6, and is characterized by comprising:
the uncertainty evaluation module of the running efficiency of the three-phase asynchronous motor is used for acquiring the running parameters of the three-phase asynchronous motor and evaluating the uncertainty of the running efficiency of the three-phase asynchronous motor;
the water pump unit operation efficiency uncertainty evaluation module is used for acquiring 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;
the water pump unit one-ton one-hundred-meter power consumption uncertainty evaluation module is used for acquiring operation parameters of a water pump unit driven by a three-phase asynchronous motor, calculating the one-ton one-hundred-meter power consumption of the water pump unit and evaluating the uncertainty of the one-ton one-hundred-meter power consumption 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.
8. The apparatus of claim 7,
the three-phase asynchronous motor operation efficiency uncertainty evaluation module is used for repeatedly measuring a driving three-phase asynchronous motor, and calculating the operation efficiency of the three-phase asynchronous motor for driving the water pump unit, the experimental standard deviation of the operation efficiency of the three-phase asynchronous motor for driving the water pump unit, the standard uncertainty component of A-type evaluation of the operation efficiency of the three-phase asynchronous motor, 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; and according to the uncertainty, calculating the synthetic standard uncertainty of the running efficiency of the three-phase asynchronous motor, the relative synthetic standard uncertainty of the running efficiency of the three-phase asynchronous motor and the relative expansion uncertainty of the load factor of the three-phase asynchronous motor.
9. The apparatus of claim 8,
the uncertainty evaluation module of the operation efficiency of the water pump unit is used for repeatedly measuring a water pump unit system for driving the three-phase asynchronous motor, and calculating the operation efficiency of the water pump unit, the experimental standard deviation of the operation efficiency of the water pump unit and the uncertainty component of the A-type evaluation of the operation efficiency of the water pump unit; respectively calculating the input power N of the three-phase asynchronous motor1Measurement introductionStandard uncertainty of (a), standard uncertainty introduced by measurement of average flow velocity of liquid at the inlet, and perimeter L of the pipe at the inlet1Measuring the introduced standard uncertainty, the perimeter L of the pipe at the outlet2Measuring the introduced standard uncertainty; calculating the vertical distance z between the inlet pressure measuring point and the horizontal central line of the pump1Measuring the standard uncertainty introduced, the vertical distance z from the outlet pressure-measuring point to the horizontal centre line of the pump2Measuring the introduced standard uncertainty, pump inlet pressure P1Measuring the introduced standard uncertainty and the pump outlet pressure P2Measuring the standard uncertainty introduced, and the inlet duct wall thickness delta1Measuring the incoming standard uncertainty and outlet pipe wall thickness delta2Measuring the introduced standard uncertainty; calculating the inner diameter D of the inlet pipe1Standard uncertainty, outlet pipe internal diameter D2Standard uncertainty of (d), standard uncertainty of pump flow Q, pump outlet liquid average flow velocity v2Standard uncertainty, motor operating efficiency etadStandard uncertainty, pump shaft power NbCalculating the standard uncertainty of the pump static pressure difference delta P and the standard uncertainty of the pump head H; and according to the uncertainty, calculating the synthetic standard uncertainty of the operation efficiency of the water pump unit, the relative synthetic standard uncertainty of the operation efficiency of the water pump unit and the relative expansion uncertainty of the operation efficiency of the water pump unit.
10. The apparatus of claim 9,
the uncertainty evaluation module for the water pump unit power consumption per ton and hundred meters is used for repeatedly measuring the driving three-phase asynchronous motor, and calculating the uncertainty component of the water pump unit power consumption per ton and hundred meters, the experimental standard deviation of the water pump unit power consumption per ton and hundred meters, and the A-type evaluation of the water pump unit power consumption per ton and hundred meters; calculating the standard uncertainty of the system conveying efficiency, the standard uncertainty of the water pump unit operating efficiency and the standard uncertainty of the total liquid conveying efficiency; and then according to the uncertainty, calculating the synthetic uncertainty of the ton hundred meter power consumption, the relative synthetic standard uncertainty of the ton hundred meter power consumption and the relative expansion uncertainty of the ton hundred meter power consumption.
11. The device as claimed in claim 10, wherein the optimal configuration scheme selection module sets a desired value, compares 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 ton-hectometer power consumption of the water pump unit with the desired values according to the uncertainty evaluation calculation result, meets the measurement requirement if the uncertainty is lower than the desired value, and adjusts the following measurement quantities including the current imeasure of the three-phase asynchronous motor and the input power N of the three-phase asynchronous motor if the uncertainty is higher than the desired value1Measurement, measurement of average flow velocity of liquid at inlet, and perimeter L of pipe at inlet1Measuring, outlet pipe perimeter L2Measuring; calculating the vertical distance z between the inlet pressure measuring point and the horizontal central line of the pump1Measuring the vertical distance z from the outlet pressure measuring point to the horizontal central line of the pump2Measuring, pump inlet pressure P1Measuring and pump outlet pressure P2Measurement, and inlet duct wall thickness delta1Measuring and outlet pipe wall thickness delta2Measuring; for the measured quantity, the selected instrument and equipment accuracy grade corresponding to the measured quantity is selected as a median, the instrument and equipment accuracy grade inquires the equipment traceability report to obtain, the accuracy grade higher than and lower than the median is selected upwards and downwards, the operating efficiency uncertainty of the three-phase asynchronous motor for driving the water pump unit, the operating efficiency uncertainty of the water pump unit and the uncertainty of the water pump unit in ton and hundred meter power consumption under different measuring instrument accuracy grades are calculated, a 'measured quantity-uncertainty' curve is drawn, the instrument and equipment with the largest influence on the uncertainty are searched, meanwhile, the cost of the instrument and equipment is considered, and the optimal instrument configuration scheme for reducing the system uncertainty is provided.
12. A terminal comprising a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to any one of claims 1 to 6.
13. Computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6.
CN202111136297.0A 2021-09-27 2021-09-27 Method and device for evaluating uncertainty of energy efficiency measurement of water pump unit Active CN113901603B (en)

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