CN111552914B - Electric load calculation method and device based on motor shaft power - Google Patents
Electric load calculation method and device based on motor shaft power Download PDFInfo
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Abstract
The disclosure relates to the field of electrical technology, and in particular relates to a method and a device for calculating an electric load based on motor shaft power. The electric power load calculation method is used for calculating an electric power load of an electric power system connected with a motor, and comprises the following steps: obtaining the maximum shaft power and rated power of a motor; acquiring operation parameters of the motor corresponding to rated power when the motor is at a first reference load rate and a second reference load rate; calculating the calculated active power and the calculated reactive power of the motor by combining the maximum shaft power and the operation parameters; and calculating the power load of the power system according to the calculated active power and the calculated reactive power. The power load calculation method can realize quantitative calculation of the power load without depending on experience coefficients or experience indexes, so that the calculation result is closer to the actual running condition.
Description
Technical Field
The disclosure relates to the field of electrical technology, and in particular relates to a method and a device for calculating an electric load based on motor shaft power.
Background
In an electric power system, electric load calculation is not only an important component of electric design, but also a basis for power supply and distribution system design. At present, a common power load calculation method comprises a coefficient method, a utilization coefficient method and a unit index method, but the methods depend on selected experience coefficients or experience indexes in the calculation process, the calculation result is greatly influenced by human factors, and if the selection is improper, larger deviation is easily generated from the actual running condition.
The above information disclosed in the background section is only for enhancement of understanding of the background of the disclosure and therefore it may include information that does not form the prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide a motor shaft power-based electric load calculation method and a motor shaft power-based electric load calculation device, wherein the electric load calculation method can realize quantitative calculation of electric loads and is not dependent on experience coefficients or experience indexes, so that a calculation result is closer to an actual running condition.
In order to achieve the above purpose, the present disclosure adopts the following technical scheme:
according to an aspect of the present disclosure, there is provided an electric load calculation method based on a motor shaft power for calculating an electric load of an electric power system to which a motor is connected, the electric load calculation method including:
obtaining the maximum shaft power and rated power of the motor;
acquiring operation parameters of the motor corresponding to the rated power when the motor is at a first reference load rate and a second reference load rate;
calculating calculated active power and calculated reactive power of the motor in combination with the maximum shaft power and the operating parameter;
and calculating the power load of the power system according to the calculated active power and the calculated reactive power.
In one exemplary embodiment of the present disclosure, the operating parameters include shaft power, efficiency, and power factor.
In an exemplary embodiment of the present disclosure, the calculated active power satisfies the following first relation:
in the formula ,PC Calculating active power for said; p (P) Z For the maximum shaft power; p (P) Z1 For the shaft power, P, of the motor at a first reference load rate Z2 Shaft power of the motor at a second reference load rate; η (eta) 1 For the efficiency of the motor at a first reference load factor, η 2 Is the efficiency of the motor at a second reference load rate.
In an exemplary embodiment of the present disclosure, the calculated reactive power satisfies the following second relation:
in the formula ,QC Calculating reactive power for the; and is also provided with
wherein ,
for the power factor of the motor at a first reference load factor, < >>
Is the power factor of the motor at a second reference load rate.
In an exemplary embodiment of the present disclosure, the first reference load rate is 100% and the second reference load rate is 75%.
In an exemplary embodiment of the present disclosure, the number of the motors is plural, and calculating the power load of the power system from the calculated active power and the calculated reactive power includes:
summing the calculated active power of each motor and multiplying the calculated active power by a simultaneous coefficient of the calculated active power to obtain the active total load of the power system;
and summing the calculated reactive power of each motor and multiplying the calculated reactive power by a simultaneous coefficient of the calculated reactive power to obtain the reactive total load of the power system.
In an exemplary embodiment of the present disclosure, the active total load is as follows:
wherein P is the active total load; p (P) Ci Calculating active power for each of the motors, i=1, 2, …, n; k (K) ∑p Active power simultaneous coefficients are calculated for the.
In an exemplary embodiment of the present disclosure, the reactive total load is as follows:
wherein Q is the reactive total load; q (Q) Ci Calculating reactive power for each of the motors, i=1, 2, …, n; k (K) ∑q A reactive power simultaneous coefficient is calculated for the.
In one exemplary embodiment of the present disclosure, K ∑p The value range of (C) is 0.85-1, K ∑q The range of the value of (2) is 0.95-1.
According to another aspect of the present disclosure, there is provided an electric load calculation apparatus based on motor shaft power for calculating an electric load of an electric power system to which a motor is connected, the electric load calculation apparatus including:
the acquisition unit is used for acquiring the maximum shaft power and rated power of the motor; the method comprises the steps of,
the motor control method comprises the steps of obtaining operation parameters of the motor corresponding to rated power when the motor is at a first reference load rate and a second reference load rate;
a calculation unit for calculating a calculated active power and a calculated reactive power of the motor in combination with the maximum shaft power and the operation parameter; the method comprises the steps of,
and calculating the power load of the power system according to the calculated active power and the calculated reactive power.
In the electric load calculation method and device based on the motor shaft power, in the actual calculation process, firstly, the maximum shaft power and rated power of a motor are obtained; secondly, acquiring operation parameters of the motor corresponding to rated power when the motor is at a first reference load rate and a second reference load rate; then, calculating the calculated active power and the calculated reactive power of the motor at rated power by combining the maximum shaft power and the operation parameters; and finally, calculating the power load of the power system according to the calculated active power and the calculated reactive power.
That is, the power load calculation method and the power load calculation device are based on the maximum shaft power of the motor, sample parameters of the motor are selected based on rated power of the motor, calculated active power and calculated reactive power of the motor at the rated power are calculated, and a specific calculation formula of the power load is finally obtained according to the calculated active power and the calculated reactive power.
Therefore, the electric load calculation method and the electric load calculation device based on the motor shaft power can realize quantitative calculation of the electric load, and on one hand, the electric load calculation method and the electric load calculation device are not dependent on experience coefficients or experience indexes any more, so that the calculation result is closer to the actual running condition; on the other hand, the power and the quantity of the motors are adjusted based on the electric load by a practitioner, so that stable operation of the motors and the electric power system is ensured.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.
Fig. 1 is a flow chart of an electrical load calculation method based on motor shaft power according to an embodiment of the present disclosure.
Fig. 2 is a simplified circuit diagram of a motor according to an embodiment of the present disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure.
The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the disclosed aspects may be practiced without one or more of the specific details, or with other methods, components, materials, etc. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring the main technical ideas of the present disclosure.
Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of an icon to another component, these terms are used in this specification for convenience only, such as in terms of the orientation of the examples described in the figures. It will be appreciated that if the device of the icon is flipped upside down, the "up" component will become the "down" component. Other relative terms such as "high," "low," "top," "bottom," "left," "right," and the like are also intended to have similar meanings.
When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure. The terms "a," "an," "the" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. in addition to the listed elements/components/etc.; the terms "first" and "second" and the like are used merely as labels, and are not intended to limit the number of their objects.
The embodiment of the disclosure provides a power load calculation method based on motor shaft power, which is used for calculating the power load of a power system connected with a motor.
As shown in fig. 1, the electric load calculation method based on the motor shaft power may include the steps of:
step S110, obtaining the maximum shaft power and rated power of the motor;
step S120, obtaining operation parameters of the motor corresponding to rated power when the motor is at a first reference load rate and a second reference load rate;
step S130, calculating the calculated active power and the calculated reactive power of the motor by combining the maximum shaft power and the operation parameters;
step S140, calculating the power load of the power system according to the calculated active power and the calculated reactive power.
That is, the power load calculation method is based on the maximum shaft power of the motor, sample parameters of the motor are selected based on rated power of the motor, calculated active power and calculated reactive power of the motor at the rated power are calculated, and a specific calculation formula of the power load is finally obtained according to the calculated active power and the calculated reactive power.
Therefore, the electric load calculation method based on the motor shaft power can realize quantitative calculation of the electric load, and on one hand, the method does not depend on experience coefficients or experience indexes any more, so that the calculation result is closer to the actual running condition; on the other hand, the power and the quantity of the motors are adjusted based on the electric load by a practitioner, so that stable operation of the motors and the electric power system is ensured.
The following describes in detail the steps of the electric load calculation method based on the motor shaft power according to the embodiment of the present disclosure:
in step S110, the maximum shaft power and the rated power of the motor are acquired.
Specifically, first, the maximum shaft power of the motor can be determined according to the operation condition of the motor; then, the rated power corresponding to the maximum shaft power can be obtained by multiplying the maximum shaft power by a constant coefficient (the constant coefficient is larger than 1, and the specific value is not particularly limited).
For example, when the motor is a water pump, the maximum shaft power of the water pump can be calculated from the flow and the lift required by the motor during the operation under the maximum working condition; when the motor is a fan, the maximum shaft power of the fan can be calculated by the air quantity and the air pressure required by the fan when the fan operates under the maximum working condition; thus, the rated power of the water pump corresponding to the maximum shaft power of the water pump and the rated power of the blower corresponding to the maximum shaft power of the blower can be obtained.
It should be noted that the shaft power of the motor in actual operation may be smaller than the maximum shaft power, and accordingly, the rated power of the motor in actual operation may be smaller than the maximum rated power (rated power corresponding to the maximum shaft power), that is: the number of rated powers of the motor may be plural and will not be described in detail here.
Of course, in engineering practice, the maximum shaft power and the rated powers of the motor are displayed on the nameplate, so that the maximum shaft power and the rated powers of the motor can be directly read from the nameplate of the motor.
In step S120, an operation parameter of the motor at the first reference load rate and the second reference load rate corresponding to the rated power is acquired.
As previously mentioned, the number of rated powers of the motor may be plural, whereby, after a rated power is selected, the operating parameters of the motor at the first and second reference load rates may be read from the nameplate of the motor, and in particular, the operating parameters may include shaft power, efficiency and power factor of the motor at different load rates, which will not be described in detail herein.
The first reference load factor and the second reference load factor may be generally obtained from a sample of a motor manufacturer, for example, the first reference load factor may be 100% and the second reference load factor may be 75%; alternatively, the first reference load factor may be 75%, and the second reference load factor may be 50%, without being particularly limited herein.
In step S130, the calculated active power and the calculated reactive power of the motor are calculated in combination with the maximum shaft power and the operation parameters, and detailed analysis is performed:
a simplified circuit diagram of the motor is shown in fig. 2, wherein: resistor R 0 Resistor R 1 Related to the iron loss, copper loss and mechanical loss characteristics of the motor, the inductance X 0 Inductance X 1 In relation to the excitation and leakage characteristics of the motor, the resistance R 0 Resistance R 1 Inductance X 0 And inductance X 1 The inherent characteristics of the motor are reflected, namely: resistor R 0 Resistance R 1 Inductance X 0 And inductance X 1 Are fixed values; resistor R Z Shaft power corresponding to motor output, namely: r is R Z To change the value, at R Z When the maximum value is taken, the shaft power output by the motor is the maximum shaft power P Z 。
Recording resistor R 0 The active loss is P' 0 Because of R 0 Is a fixed value, so P' 0 Is a fixed loss. According to the principle of electromechanics, R Z Far R is the impedance of 1 and X1 Sum, so R Z The voltage across it can be approximated as U 0 The current flowing through it is
Further can be obtained from R 1 The active loss is->
And is also provided with
Subsequently, the shaft power P of the motor at the first reference load rate Z1 Shaft power P of motor at second reference load rate Z2 Efficiency η of the motor at a first reference load rate 1 And efficiency η of the motor at the second reference load rate 2 The above formula is incorporated. Wherein eta 1 and η2 Can be obtained from a sample of the motor manufacturer and will not be described in detail herein.
Since the above derivation is based on a single-phase circuit diagram (fig. 2) and the motor is actually three-phase, consider the three-phase transformation equation to be convertible:
wherein the rated voltage
Above-mentionedThe difference is made between the two types, and R can be obtained by arrangement 1 and P‘0 The values are respectively: />
Thereby, the maximum shaft power P is obtained at the shaft power of the motor Z When it is, its active loss P Damage to Is that
Recording device
Then
Thus, the calculated active power P of the motor C The following first relation is satisfied:
in addition, record inductance X 0 The reactive loss generated is Q' 0 Because of X 0 Is a fixed value, so Q' 0 Is a fixed loss. At the same time, inductance X 1 The reactive power loss generated is
From this the following equation can be derived:
subsequently, the shaft power P of the motor at the first reference load rate Z1 Shaft power P of motor at second reference load rate Z2 The motor is at a first referenceEfficiency η at load factor 1 And efficiency η of the motor at the second reference load rate 2 Bringing the above formula and considering the three-phase transformation formula to be convertible into:
the difference is made by the two formulas, and the arrangement can be obtained:
thereby, the maximum shaft power P is obtained at the shaft power of the motor Z When it calculates reactive power Q C Is that
Recording device
Then
wherein ,
Thus, the reactive power Q is calculated C The following second relation is satisfied:
in step S140, the power load of the power system is calculated from the calculated active power and the calculated reactive power.
For example, the number of motors may be plural, and accordingly, the step S140 may include the steps of:
step S1401, summing the calculated active power of each motor and multiplying the calculated active power by a simultaneous coefficient of the calculated active power to obtain an active total load of the power system;
step S1402, the calculated reactive power of each motor is summed and multiplied by the calculated reactive power simultaneous coefficient to obtain the reactive total load of the power system.
Specifically, the active total load P may satisfy the following third relation:
in the formula ,PCi Calculating active power for each motor, i=1, 2, …, n; k (K) ∑p To calculate the active power simultaneous coefficient, and K ∑p The value of (2) ranges from 0.85 to 1, and will not be described in detail here.
Meanwhile, the reactive total load Q may satisfy the following fourth relation:
in the formula ,QCi Calculating reactive power for each motor, i=1, 2, …, n; k (K) ∑q To calculate the reactive power simultaneous coefficient, and K ∑q The range of the value of (2) is 0.95-1.
Of course, the number of motors may also be one, in which case the active total load of the power system p=p C Reactive total load q=q of power system C And will not be described in detail herein.
The disclosed embodiments also provide an electric load calculation device based on motor shaft power for calculating an electric load of an electric power system to which a motor is connected, the electric load calculation device may include an acquisition unit and a calculation unit, wherein:
the acquisition unit is used for acquiring the maximum shaft power, rated power and operation parameters of the motor corresponding to the rated power when the motor is at the first reference load rate and the second reference load rate; the calculating unit is used for combining the maximum shaft power and the operation parameters to calculate the calculated active power and the calculated reactive power of the motor; and calculating the power load of the power system according to the calculated active power and the calculated reactive power.
For example, the acquisition unit and the calculation unit may be a CPU (central processing unit ) or a GPU (graphics processor, graphics Processing Unit), etc., which will not be described in detail here.
It is to be understood that the disclosure is not limited in its application to the details of construction and the arrangement of components set forth in the disclosure. The disclosure is capable of other embodiments and of being practiced and carried out in various ways. The foregoing variations and modifications are within the scope of the present disclosure. It should be understood that the present disclosure disclosed and defined herein extends to all alternative combinations of two or more of the individual features mentioned or evident from the text and/or drawings. All of these different combinations constitute various alternative aspects of the present disclosure. The embodiments described herein explain the best modes known for practicing the disclosure and will enable others skilled in the art to utilize the disclosure.
Claims (10)
1. An electric load calculation method based on motor shaft power for calculating an electric load of an electric power system to which a motor is connected, the electric load calculation method comprising:
obtaining the maximum shaft power and rated power of the motor;
acquiring operation parameters of the motor corresponding to the rated power when the motor is at a first reference load rate and a second reference load rate;
calculating calculated active power and calculated reactive power of the motor in combination with the maximum shaft power and the operating parameter;
and calculating the power load of the power system according to the calculated active power and the calculated reactive power.
2. The electrical load calculation method of claim 1, wherein the operating parameters include shaft power, efficiency, and power factor.
3. The electrical load calculation method according to claim 2, wherein the calculated active power satisfies the following first relation:
in the formula ,PC Calculating active power for said; p (P) Z For the maximum shaft power; p (P) Z1 For the shaft power, P, of the motor at a first reference load rate Z2 Shaft power of the motor at a second reference load rate; η (eta) 1 For the efficiency of the motor at a first reference load factor, η 2 Is the efficiency of the motor at a second reference load rate.
4. A method of calculating an electrical load according to claim 3, wherein the calculated reactive power satisfies the following second relation:
in the formula ,QC Calculating reactive power for the; and is also provided with
wherein ,
for the power factor of the motor at a first reference load factor, < >>
Is the power factor of the motor at a second reference load rate.
5. The power load calculation method according to claim 1, wherein the first reference load factor is 100% and the second reference load factor is 75%.
6. The power load calculation method according to claim 4, wherein the number of the motors is plural, and calculating the power load of the power system from the calculated active power and the calculated reactive power includes:
summing the calculated active power of each motor and multiplying the calculated active power by a simultaneous coefficient of the calculated active power to obtain the active total load of the power system;
and summing the calculated reactive power of each motor and multiplying the calculated reactive power by a simultaneous coefficient of the calculated reactive power to obtain the reactive total load of the power system.
7. The power load calculation method according to claim 6, wherein the active total load is represented by a third relation:
wherein P is the active total load; p (P) Ci Calculating active power for each of the motors, i=1, 2, …, n; k (K) ∑p Active power simultaneous coefficients are calculated for the.
8. The power load calculation method according to claim 7, wherein the reactive total load is represented by a fourth relation:
wherein Q is the reactive total load; q (Q) Ci Calculating reactive power for each of the motors, i=1, 2, …, n; k (K) ∑q A reactive power simultaneous coefficient is calculated for the.
9. The power load calculation method according to claim 8, wherein K is ∑p The value range of (C) is 0.85-1, K ∑q The range of the value of (2) is 0.95-1.
10. An electric load calculation device based on motor shaft power for calculating an electric load of an electric power system to which a motor is connected, the electric load calculation device comprising:
the acquisition unit is used for acquiring the maximum shaft power and rated power of the motor; the method comprises the steps of,
the motor control method comprises the steps of obtaining operation parameters of the motor corresponding to rated power when the motor is at a first reference load rate and a second reference load rate;
a calculation unit for calculating a calculated active power and a calculated reactive power of the motor in combination with the maximum shaft power and the operation parameter; the method comprises the steps of,
and calculating the power load of the power system according to the calculated active power and the calculated reactive power.
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