CN115699559A - Frequency conversion system - Google Patents

Frequency conversion system Download PDF

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Publication number
CN115699559A
CN115699559A CN202180039601.1A CN202180039601A CN115699559A CN 115699559 A CN115699559 A CN 115699559A CN 202180039601 A CN202180039601 A CN 202180039601A CN 115699559 A CN115699559 A CN 115699559A
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China
Prior art keywords
frequency converter
frequency
current
efficiency
output
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CN202180039601.1A
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Inventor
石靖峰
石磊
陈强
路海滨
曹法立
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Publication of CN115699559A publication Critical patent/CN115699559A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/001—Measuring real or reactive component; Measuring apparent energy
    • G01R21/002—Measuring real component
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/001—Measuring real or reactive component; Measuring apparent energy
    • G01R21/005—Measuring apparent power
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/006—Measuring power factor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Air Conditioning Control Device (AREA)
  • Control Of Ac Motors In General (AREA)
  • Inverter Devices (AREA)

Abstract

The application discloses frequency conversion system, it includes: a frequency converter; a regulating device frequency-modulated by the frequency converter; the frequency conversion system further comprises: a processing module configured to: respectively obtaining the current operating frequency of the regulating device and the current output current of the frequency converter; a preset function of the efficiency of the frequency converter on the operating frequency and the output current of the regulating device is obtained; and calculating the efficiency alpha of the frequency converter according to the current operating frequency, the current output current and a preset function.

Description

Frequency conversion system
Cross Reference to Related Applications
The present application claims priority of chinese patent application having application number 202011141298.X, entitled "frequency conversion system" filed by chinese patent office on 22/10/2020, the entire contents of which are incorporated herein by reference.
Technical Field
The application relates to the technical field of household appliances, in particular to a frequency conversion system with an online energy consumption detection function.
Background
The application of intelligent control technology and Internet technology in air conditioning systems is based on the capability of monitoring the performance of the air conditioning systems on line and in real time. Through analysis of actual operation performance test data, the defects of the product in the actual operation process are found, main factors causing poor unit performance are found, directions are indicated for product structure optimization design and control strategy optimization design, and energy conservation in actual operation of the product is achieved.
Disclosure of Invention
The application relates to a frequency conversion system, it includes:
a frequency converter;
a regulating device frequency-modulated by the frequency converter; the frequency conversion system further comprises:
a processing module configured to:
respectively acquiring the current operating frequency of the regulating device and the current output current of the frequency converter;
calling a preset function of the efficiency of the frequency converter on the operating frequency and the output current of the compressor;
and calculating the efficiency alpha of the frequency converter according to the current operating frequency, the current output current and a preset function.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments will be briefly described below, it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of the power consumption circuitry of an air conditioner;
fig. 2 is a schematic block diagram of an embodiment of an air conditioner according to the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.
The two most important online properties of a product are "online capacity" and "online energy consumption". The actual operation energy consumption of the frequency conversion system (such as the compressor and the frequency converter thereof, the outdoor fan motor and the frequency converter thereof) in the air conditioning system accounts for a large proportion of the energy consumption of the whole air conditioner, so the energy consumption test of the frequency conversion system is particularly important. A reckoning scheme based on a finite measuring point application data fitting formula is proposed in 2018 by a thesis of an online monitoring method of performance of an air conditioning system based on finite measuring points, yangyi and the like. Referring to fig. 1, a schematic diagram of an electrical circuit is shown, and the paper estimates the power consumption of the entire indoor and outdoor units according to the current before point (1), and the estimation method is as follows:
Figure PCTCN2021081677-APPB-000001
in the formula: i is all Is the effective current, I' is the current at the outdoor measurement point, I r For measuring the point current, PF is the corresponding power factor, C 1 ～C 5 Are all fitting coefficients.
This method requires setting a plurality of detection devices, and since the difference of the switching of the indoor windshield is not distinguished, the error is large, and the maximum error is 10.3%.
The inverter system referred to in the present application mainly refers to an inverter system in an air conditioning system.
The regulating and controlling device in the application can be a compressor, an outdoor fan motor or other electric devices controlled by frequency modulation of a frequency converter and the like.
The following description will be given taking the compressor as an example of the conditioning device.
The basic operating principle of an air conditioner.
A refrigeration cycle of an air conditioner includes a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.
The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.
The outdoor unit of the air conditioner refers to a portion including a compressor of a refrigeration cycle and includes an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit of the air conditioner.
The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. The air conditioner is used as a heater in a heating mode when the indoor heat exchanger is used as a condenser, and as a cooler in a cooling mode when the indoor heat exchanger is used as an evaporator.
The frequency conversion system comprises a frequency converter and a compressor, and the compressor, a condenser, an expansion valve and an evaporator are controlled by a processing module to execute the refrigeration cycle of the air conditioner.
Referring to fig. 2, the control device is a compressor, and the compressor is controlled and adjusted in rotation speed by the frequency converter through frequency modulation, so that the compressor is always in the optimal rotation speed state, and the energy consumption of the air conditioner is saved.
Along with the enhancement of energy-saving and environment-friendly awareness of the air conditioner and the continuous improvement of household intelligence, the concept of the intelligent air conditioner is more popularized. In the aspect of air conditioner temperature setting, when the indoor temperature is within a certain range, the comfort level of a human body is almost not different, if within the range, a lower temperature or a higher temperature is set, the comfort level of the human body is not changed, the energy consumption of the air conditioner is increased, the energy consumption of the air conditioner corresponding to the temperature set by a user is not favorably reminded, the long-time use of the air conditioner is not favorably realized, and the environment protection and energy conservation are also not favorably realized. Therefore, the demand for online detection of the energy consumption of the air conditioner is urgent.
Processing module
In the present application, the processing module can be configured to calculate the efficiency α of the frequency converter in real time according to the output current I of the frequency converter and the current operating frequency f of the compressor, which are obtained in real time, and a preset function of the efficiency of the frequency converter with respect to the output current I and the operating frequency f.
The output current I of the frequency converter can be detected by a Hall current sensor arranged in the frequency converter, the operating frequency f of the compressor is a control output parameter and is easy to obtain, and a preset function is preset, so that when the air conditioner operates in real time, an external detection device does not need to be additionally arranged, the test difficulty and complexity are simplified, and the detection cost is prevented from being increased; and because the external detection device is not added, the test error generated by the external detection device can not be introduced, thereby improving the detection precision of the efficiency of the frequency converter.
The loss of the frequency converter consists of three parts: the rectification loss accounts for about 40%; inversion loss is about 50%; the control loop losses account for about 10%. The rectification loss and the inversion loss are changed along with the difference of the capacity, the load and the topological structure of the frequency converter, and the control loop loss is not changed along with the capacity and the load of the frequency converter. The most direct influence factor of the load change is torque, and experiments show that the torque and the current have strong positive correlation, and the change of the load can be described by replacing the torque with the current.
Acquisition of a predetermined function g
In the experimental process, the efficiency of the frequency converter is found to be related to the output current and the operating frequency of the regulated compressor.
Therefore, in the experiment, a plurality of sets of data of the efficiency with respect to the output current I and the operating frequency f are acquired in real time.
Specifically, S1: controlling the compressor to operate at an operating frequency f, and respectively working a down converter at the operating frequency f by a plurality of different output currents and correspondingly acquiring the actual efficiency alpha' of the down converter;
s2: changing the operating frequency of the compressor to f ', making f = f', and executing to S1 again, thereby obtaining a plurality of sets of data of efficiency on the output current I and the operating frequency f.
For example, the data in the following table is obtained.
Figure PCTCN2021081677-APPB-000002
The actual efficiency α ' of the converter in S1 is obtained by the quotient of the detected actual output power Pc ' and actual input power Pr ' of the converter.
The actual input power Pr' and the actual output power Pc can be detected by a power meter.
And performing double-factor fitting by using the multiple groups of data to obtain a binary quadratic function alpha = g (I, f) of the efficiency alpha with respect to the output current I and the operating frequency f to form a preset function.
In the present application, the preset function is the following function:
α＝g(I，f)＝a0+a1*f+a2*I+a3*f*I+a4*f 2 +a5*I 2 。
wherein the parameters a 0-a 5 are calculated according to the principle of minimum error and the actually acquired data.
For example, a0=0.912776, a1=0.001759, a2= -0.000632, a3=0.000005, a4= -0.000011, a5= -0.000006 are finally determined from the plurality of sets of data, and then
α＝0.912776+0.001759*f-0.000632*I+0.000005*f*I-0.000011*f 2 -0.000006*I 2 。
Suppose that the current operating frequency f of the compressor is 78Hz, the output current I of the inverter is 15A, and the output power of the inverter is denoted as P (in W).
Then using the above equation, the efficiency α =0.912776+0.001759 + 78-0.000632 + 15+0.000005 + 78-0.000011 + 78 of the current frequency converter can be calculated 2 -0.000006*15 2 ＝0.978074。
Therefore, the input power of the frequency converter is estimated as W/0.978074 (unit is W).
The deviation between the input power and the actual power of the frequency converter obtained through measurement and calculation is about 5%, and compared with the precision of the existing algorithm, the precision of the frequency converter is greatly improved.
Acquisition of efficiency alpha of frequency converter
And after the preset function g is obtained, writing the binary quadratic function g into a storage unit for later calling.
In the real-time operation process of the air conditioner, if the energy consumption of the compressor and the frequency converter is required to be monitored in real time, the efficiency alpha of the frequency converter is firstly acquired.
Specifically, the current output current I of the frequency converter and the current operating frequency f of the compressor are obtained in real time, a preset function g is obtained, and the current output current I and the current operating frequency f are brought into the preset function g, so that the corresponding efficiency alpha is obtained
Secondly, under the condition that the output power of the frequency converter is known, the input power of the frequency converter can be obtained according to the efficiency alpha of the frequency converter, namely, the energy consumption of the compressor and the frequency converter can be obtained.
Input power Pr of frequency converter
After the efficiency α of the frequency converter is obtained, the input power Pr of the frequency converter can be calculated according to the efficiency α of the frequency converter.
In the present application, the input power Pr of the frequency converter may be obtained by active power calculation or by apparent power calculation.
In some embodiments of the present application, calculating the input power Pr of the frequency converter from the active power and the efficiency α of the frequency converter comprises:
s1: acquiring output active power Pc of a frequency converter;
s2: and calculating the input power Pr = Pc/alpha of the frequency converter.
Wherein S1: the method for obtaining the output active power Pc of the frequency converter comprises the following steps:
s11: collecting the current Id of the frequency converter on a d axis and the current Iq of the frequency converter on a q axis;
s12: acquiring an instruction voltage value Ud on a d axis and an instruction voltage value Uq on a q axis of the frequency converter after amplitude limiting according to a modulation rate;
s13: pc =3/2 (Id × (u × (d × + Iq) × (Uq)) is calculated from the output currents Id and Iq in S11 and the output voltages Ud and Uq in S12.
The d axis is an axis in the magnetic flux direction of the magnet in the regulating device, and the q axis is an axis perpendicular to the d axis.
The output currents Id and Iq in S11 can be obtained through Hall current sensors arranged in the frequency converter.
The output voltages Ud and Uq in S12 are voltage command output control amounts and can be directly obtained.
In some embodiments of the present application, calculating the input power Pr of the frequency converter from the apparent power and the efficiency α of the frequency converter comprises:
s1': acquiring output apparent power S2i of a frequency converter;
s2': acquiring an output power coefficient F2i of the frequency converter;
s3': the input power Pr = S2i F2i/α of the frequency converter is calculated.
Wherein S2i can be calculated and output by a frequency converter; f2i is the output power factor of the frequency converter and can be directly obtained from the frequency converter.
Referring again to fig. 2, similarly, when the conditioning device is an outdoor fan motor, the processing module is configured to:
s1': respectively acquiring the current operating frequency of an outdoor fan motor and the current output current of a frequency converter;
s2': calling a preset function of the efficiency of the frequency converter on the outdoor fan motor and the running frequency;
s3': and calculating the efficiency alpha of the frequency converter according to the current operating frequency, the current output current and a preset function.
The operation frequency in the S1' is a control output parameter and is easy to obtain; the output current of the frequency converter can be directly detected from a Hall current sensor arranged in the frequency converter.
The obtaining manner of the preset function in S2 ″ is the same as that of the compressor, which is the above-mentioned regulating device, and is not described herein again.
The method for calculating the efficiency α in S3 ″ is the same as the method for calculating the efficiency α when the control device is a compressor, and is not described herein again.
The efficiency of the frequency converter can be obtained by regulating and controlling the operating frequency of the device and the output current of the frequency converter, the output current is obtained through a current sensor of the frequency converter, the operating frequency is a control output parameter and is easy to obtain, therefore, an external detection device is not required to be added, the test difficulty and complexity are simplified, the external detection device is not additionally arranged, the increase of the detection cost is avoided, the test error caused by the increase of the external detection device is avoided, and the detection precision of the efficiency of the frequency converter is improved.
After obtaining the efficiency α of the frequency converter, the input power Pr of the frequency converter can be calculated according to the efficiency α of the frequency converter.
The calculation method of the input power Pr of the frequency converter is the same as that of the compressor, and is not described herein again.
The input power Pr of the frequency converter is the energy consumption of the outdoor fan motor and the frequency converter thereof.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; such modifications and substitutions do not depart from the spirit and scope of the corresponding claims in this application.

Claims (10)

  1. A variable frequency system, comprising:
    a frequency converter;
    a regulating device frequency-modulated by the frequency converter; the frequency conversion system further comprises:
    a processing module configured to:
    respectively acquiring the current operating frequency of the regulating device and the current output current of the frequency converter;
    a preset function of the efficiency of the frequency converter on the operating frequency and the output current of the regulating device is obtained;
    and calculating the efficiency alpha of the frequency converter according to the current operating frequency, the current output current and a preset function.
  2. The variable frequency system of claim 1, further comprising:
    and the storage module is used for storing the preset function for calling.
  3. The frequency conversion system according to claim 1, wherein the obtaining of the preset function specifically is:
    acquiring data: controlling the regulating and controlling device to operate at different operating frequencies, acquiring different output currents of the frequency converter and corresponding actual efficiency of the frequency converter under each operating frequency, and forming a plurality of groups of data about the operating frequencies, the output currents and the efficiency;
    fitting data: and fitting a corresponding functional relation alpha = g (f, I) of the efficiency alpha with respect to the operating frequency and the output current according to the formed multiple groups of data to form the preset function, wherein f represents the operating frequency and I represents the output current.
  4. The frequency conversion system of claim 3,
    in acquiring the data, calculating the actual efficiency α' of the frequency converter comprises:
    acquiring the actual input power Pr' of the frequency converter;
    acquiring actual output power Pc' of the frequency converter;
    calculating the actual efficiency α ' = Pc '/Pr ' of the frequency converter.
  5. The frequency conversion system of claim 4,
    the actual input power Pr' of the frequency converter is obtained through actual detection of a power meter;
    the actual output power Pc' of the frequency converter is obtained through actual detection of a power meter.
  6. Frequency conversion system according to claim 1 or 2,
    the predetermined function is a quadratic function of the efficiency with respect to the operating frequency and the output current.
  7. Frequency conversion system according to claim 1 or 2, characterized in that the input power Pr of the frequency converter is calculated from the efficiency of the frequency converter.
  8. The frequency conversion system according to claim 7, characterized in that the input power Pr of the frequency converter is calculated from the active power, specifically:
    acquiring the output active power Pc of the frequency converter;
    calculating the input power Pr = Pc/alpha of the frequency converter;
  9. the frequency conversion system according to claim 7, wherein the obtaining of the output active power Pc of the frequency converter specifically comprises:
    collecting the current Id of the frequency converter on a d axis and the current Iq of the frequency converter on a q axis;
    acquiring an instruction voltage value Ud on a d axis and an instruction voltage value Uq on a q axis of the frequency converter after amplitude limiting according to a modulation rate;
    calculating Pc =3/2 (Id · Ud + Iq · Uq);
    and the d axis is an axis in the magnetic flux direction of the magnet in the regulating device, and the q axis is an axis perpendicular to the d axis.
  10. The frequency conversion system according to claim 7, characterized in that the input power Pr of the frequency converter is calculated by the apparent power, in particular:
    acquiring output apparent power S2i of the frequency converter;
    acquiring an output power factor F2i of the frequency converter;
    calculating the input power Pr of the frequency converter: pr = S2i F2i/α.
CN202180039601.1A 2020-10-22 2021-03-19 Frequency conversion system Pending CN115699559A (en)

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CN202011141298.XA CN112367003B (en) 2020-10-22 2020-10-22 Frequency conversion system
PCT/CN2021/081677 WO2022083055A1 (en) 2020-10-22 2021-03-19 Frequency conversion system

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CN103236816A (en) * 2013-04-26 2013-08-07 武汉港迪电气有限公司 Method for realizing stable operation of frequency converter under V/F (voltage/frequency) control
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