CN112113318B - Control method for variable DQ compensation current proportional gain coefficient - Google Patents
Control method for variable DQ compensation current proportional gain coefficient Download PDFInfo
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- CN112113318B CN112113318B CN201910544673.6A CN201910544673A CN112113318B CN 112113318 B CN112113318 B CN 112113318B CN 201910544673 A CN201910544673 A CN 201910544673A CN 112113318 B CN112113318 B CN 112113318B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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Abstract
The invention provides a control method of a variable DQ compensation current proportional gain coefficient, which is suitable for a variable-frequency air conditioning system adopting a single-cylinder compressor. Firstly, determining the optimal values of coefficients of the compressor in different rotating speed ranges through a preliminary test experiment, comparing the acquired actual rotating speed values with a preset value, and selecting different compensation current proportional gain coefficients according to a comparison result to ensure the optimal power of the whole system, wherein the preset rotating speed can be divided into two sections or multiple sections. The inventor finds that if the control of the proportional gain coefficient of the compensation current of the DQ axis according to the rotating speed of different working conditions can be adopted, the APF of the whole air conditioning system is necessarily improved.
Description
Technical Field
The invention belongs to the field of debugging and development of variable frequency air conditioners, and particularly relates to a control method for a variable DQ compensation current proportional gain coefficient.
Background
In recent years, inverter air conditioners are becoming the mainstream of the market. Along with the improvement of social demands and related standards, the related technology of the variable frequency air conditioner is also continuously developed and advanced. In view of the special working environment of the air-conditioning compressor and the high requirements on energy efficiency and working environment, the motor used by the variable-frequency compressor is basically an embedded permanent magnet synchronous motor, and the control method is sensorless vector control.
By adopting the control method, the characteristic of moment mutation of the single-rotor variable frequency compressor is combined, and a current compensation is additionally added on the basis of the DQ normal DQ shaft current control. The coefficient is determined by an electric operator according to the running current waveform of the compressor, a better parameter is determined, the working condition is selected from medium and low speed, and the DQ compensation current proportional gain coefficient is fixed after being determined. However, if the coefficient is too large, the power of the controller system will increase, and if the coefficient is too small, the compressor may be operated unstably and the power of the compressor will increase, so the determination method takes less account of the influence of the coefficient on the power of the whole system and different states of the compressor at different rotation speeds.
Therefore, a control method for the variable DQ compensation current proportional gain coefficient suitable for the single-rotor compressor variable frequency air conditioner is required to be provided.
Disclosure of Invention
The invention aims to provide a control method of a variable DQ compensation current proportional gain coefficient, which is used for solving the problems that in the prior art, the influence of the coefficient on the power of the whole system is less considered, the power of a controller system is increased due to the larger coefficient under different conditions of different rotating speeds of a compressor, the power of the compressor is increased due to the unstable operation of the compressor when the coefficient is smaller, and the power of the compressor is increased.
In order to solve the technical problem, the invention provides a control method of a variable DQ compensation current proportional gain coefficient, which is suitable for a variable frequency air conditioner compressor and comprises the following steps:
s1: obtaining the optimal value of the DQ compensation current proportional gain coefficient of the variable frequency air conditioner compressor under different rotating speed values, and obtaining a preset rotating speed range and a mapping set of the optimal value of the DQ compensation current proportional gain coefficient corresponding to the preset rotating speed range;
s2: acquiring the real-time working rotating speed of the variable frequency air conditioner compressor, matching the real-time working rotating speed in the mapping set with a corresponding preset rotating speed range, and obtaining the optimal value of the DQ compensation current proportional gain coefficient corresponding to the preset rotating speed range;
s3: and taking the optimal value of the corresponding DQ compensation current proportional gain coefficient as the current DQ compensation current proportional gain coefficient of the inverter air conditioner compressor, and returning to execute S2.
Optionally, the step S1 specifically includes:
s11: under the condition of an intermediate refrigeration working condition, changing the DQ compensation current proportional gain coefficient, detecting the corresponding power and energy efficiency of the variable-frequency air-conditioning compressor, and collecting corresponding statistical data and the rotating speed value of the compressor at the current stage;
s12: and analyzing the optimal value of the DQ compensation current proportional gain coefficient corresponding to the rotating speed value of the variable-frequency air conditioner compressor under the intermediate refrigeration working condition through the statistical data.
Optionally, step S1 further specifically includes:
s13: under the condition of a rated refrigeration working condition, changing the DQ compensation current proportional gain coefficient, detecting the corresponding power and energy efficiency of the inverter air-conditioning compressor, and collecting corresponding statistical data and the rotating speed of the inverter air-conditioning compressor at the current stage;
s14: and analyzing the optimal value of the DQ compensation current proportional gain coefficient corresponding to the rotating speed value of the variable-frequency air conditioner compressor under the rated refrigeration working condition through the statistical data.
Optionally, the number of the preset rotating speed ranges is multiple.
Optionally, the range set composed of the plurality of preset rotation speed ranges may be a continuous range.
Optionally, the range set composed of the plurality of preset rotation speed ranges may also be discontinuous ranges.
Alternatively, the number of the preset rotation speed ranges may be 2.
Optionally, the number of the preset rotation speed ranges may also be 3.
Optionally, the number of the preset rotation speed ranges may also be 4.
Optionally, the number of the preset rotation speed ranges may also be 5.
The invention provides a control method of a variable DQ compensation current proportional gain coefficient, which determines the optimal value of the DQ compensation current proportional gain coefficient of a compressor in different rotating speed ranges through a preliminary test experiment. And comparing the acquired actual rotating speed value with a preset value, and selecting different current proportional gain coefficients according to the comparison result to ensure that the power of the whole system is optimal, wherein the preset rotating speed can be divided into two sections or multiple sections. The inventor finds that if the control of the proportional gain coefficient of the DQ compensation current according to the rotation speed of different working conditions can be adopted, the APF of the whole air conditioning system is necessarily improved.
Drawings
Fig. 1 is a flowchart of a method for controlling a proportional gain coefficient of a variable DQ compensation current according to an embodiment of the present invention.
Detailed Description
The following describes the control method of the variable DQ compensation current proportional gain coefficient according to the present invention in further detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
As shown in fig. 1, the present embodiment provides a method for controlling a proportional gain coefficient of a variable DQ compensation current, which is suitable for an inverter air conditioner compressor, and mainly includes the following steps:
s1: obtaining the optimal value of the DQ compensation current proportional gain coefficient of the variable frequency air conditioner compressor under different rotating speed values, and obtaining a preset rotating speed range and a mapping set of the optimal value of the DQ compensation current proportional gain coefficient corresponding to the preset rotating speed range;
s2: acquiring the real-time working rotating speed of the variable frequency air conditioner compressor, matching the real-time working rotating speed in the mapping set with a corresponding preset rotating speed range, and obtaining the optimal value of the DQ compensation current proportional gain coefficient corresponding to the preset rotating speed range;
s3: and taking the optimal value of the corresponding DQ compensation current proportional gain coefficient as the current DQ compensation current proportional gain coefficient of the inverter air conditioner compressor, and returning to execute S2.
For the power consumption of the whole system, the optimal value of the DQ compensation current proportional gain coefficient of the compressor in different rotating speed ranges can be determined through early debugging. And then, comparing the acquired actual rotating speed value V with a preset value, and selecting different DQ compensation current proportional gain coefficients according to the comparison result, so that the optimal power of the whole system can be ensured. The flow chart is shown in fig. 1.
Optionally, the step S1 may specifically include:
the step S1 specifically includes:
s11: under the condition of an intermediate refrigeration working condition, changing the DQ compensation current proportional gain coefficient, detecting the corresponding power and energy efficiency of the variable-frequency air-conditioning compressor, and collecting corresponding statistical data and the rotating speed value of the compressor at the current stage;
s12: and analyzing the optimal value of the DQ compensation current proportional gain coefficient corresponding to the rotating speed value of the variable-frequency air conditioner compressor under the intermediate refrigeration working condition through the statistical data.
Optionally, the step S1 may further specifically include:
s13: under the condition of a rated refrigeration working condition, changing the DQ compensation current proportional gain coefficient, detecting the corresponding power and energy efficiency of the inverter air-conditioning compressor, and collecting corresponding statistical data and the rotating speed of the inverter air-conditioning compressor at the current stage;
s14: and analyzing the optimal value of the DQ compensation current proportional gain coefficient corresponding to the rotating speed value of the variable-frequency air conditioner compressor under the rated refrigeration working condition through the statistical data.
Alternatively, the range set composed of the plurality of preset rotation speed ranges may be a continuous range, where the continuous range refers to that there is no break point between the plurality of preset rotation speed ranges.
Optionally, the range set composed of the plurality of preset rotation speed ranges may also be a discontinuous range, that is, a break point exists between the plurality of preset rotation speed ranges.
It should be noted that the preset rotation speed range may be divided into two sections, or may be divided into three sections, or may be divided into four sections, or may be divided into more sections in order to obtain a more accurate DQ compensation current proportional gain coefficient. The number of the segments to be divided can be selected according to actual needs, and is not limited herein.
Since the overall power of the system includes the power of the driving part, the power of the compressor and the power generated by other parts, the higher the power of the system, the higher the generated power consumption, and the lower the power of the system, the higher the energy efficiency of the system. The power of the driving part and the power of the compressor determine the power of the system, while it keeps the rest of the system unchanged. Therefore, in order to verify that the whole air conditioning system can be improved by changing the DQ compensation current proportional gain coefficient, the inventor carries out actual measurement tests under the condition of keeping other parts of the system unchanged.
Firstly, a test experiment is carried out on the air conditioner under the intermediate refrigeration working condition, the influence of different DQ compensation current proportional gain coefficients on the performance of the air conditioner working under the intermediate refrigeration working condition is counted, and the changes of the power and the energy efficiency of the air conditioning system are recorded specifically, as shown in Table 1.
TABLE 1 variation of actual measurement power and actual measurement energy efficiency of air conditioning system with DQ compensation current proportional gain coefficient under intermediate refrigeration condition
It can be seen from table 1 that the overall power of the intermediate refrigeration condition is greatly affected by the value of the DQ compensation current proportional gain coefficient, and the performance of the system is different in different gain adjustment directions. The Q-axis gain compensation coefficient of 3.75 is kept unchanged, only the D-axis gain compensation coefficient is adjusted, the power of the system is seen to be in a slow rising trend along with the increase of the parameter value, which shows that the influence of the D-axis gain on the stability of the operation of the compressor is small, and the power of the driving part, which is increased due to the increase of the gain, is inevitably larger than the power of the compressor, which is reduced due to the driving adjustment. Under the same D-axis gain compensation coefficient value, the Q-axis gain compensation coefficient is increased, the system power is obviously reduced, and the Q-axis gain compensation coefficient has larger influence on the aspects of inhibiting the system vibration and reducing the extra power consumption of the compressor caused by the vibration, and has considerable influence on the power difference accounting for 2 percent of the total power of the system. At this time, the operating frequency of the compressor in the experimental intermediate cooling condition was 22 Hz.
Next, the inventors performed test experiments again using a rated refrigeration condition in APF (Annual performance factor). The final test results are shown in table 2.
TABLE 2 changes of actually measured power and actually measured energy efficiency of air conditioning system along with changes of DQ compensating current proportional gain coefficient under rated refrigeration condition
When the working condition is adopted, the running frequency of the compressor reaches 53Hz, the stability is obviously superior to that of the middle refrigeration working condition, and the influence on the power and the energy efficiency of the compressor is obviously reduced when the DQ compensation current proportional gain coefficient value changes in a certain range, so that the larger DQ compensation current proportional gain coefficient value can make the overall power of the system higher and the generated power consumption more.
Tables 1 and 2 reflect the influence of the DQ compensation current proportional gain coefficient on the system under different working conditions. It can be seen that the gain is different between the influence on the system under the rated refrigeration working condition and the influence on the system under the intermediate refrigeration working condition, and the compressor operates more stably in the rated refrigeration operation stage, so that a higher DQ compensation current proportional gain coefficient is not needed in principle, the DQ compensation current proportional gain coefficient is reduced, and the energy efficiency of the system is improved. In the middle working condition, the larger DQ compensation current proportional gain coefficient can make the overall power of the system lower, the power consumption lower and the energy efficiency higher. The difference value of the adjustment effect of different parameters on the system under the rated refrigeration working condition can reach 8W.
In summary, the present invention provides a method for controlling a DQ compensation current proportional gain coefficient, which is applicable to a variable frequency air conditioner compressor, and determines an optimal value of the DQ compensation current proportional gain coefficient of the compressor in different rotation speed ranges through a previous test experiment. And comparing the acquired actual rotating speed value with a preset value, and selecting different current proportional gain coefficients according to the comparison result to ensure that the power of the whole system is optimal, wherein the preset rotating speed can be divided into two sections or multiple sections. The inventor finds that if the control of the proportional gain coefficient of the DQ compensation current according to the rotation speed of different working conditions can be adopted, the APF of the whole air conditioning system is necessarily improved.
Claims (8)
1. A control method of a variable DQ compensation current proportional gain coefficient is applicable to a variable frequency air conditioning system adopting a single cylinder compressor, and is characterized by comprising the following steps:
s1: obtaining the optimal value of the DQ compensation current proportional gain coefficient of the variable frequency air conditioner compressor under different rotating speed values, and obtaining a preset rotating speed range and a mapping set of the optimal value of the DQ compensation current proportional gain coefficient corresponding to the preset rotating speed range;
s2: acquiring the real-time working rotating speed of the variable frequency air conditioner compressor, matching the real-time working rotating speed in the mapping set with a corresponding preset rotating speed range, and obtaining the optimal value of the DQ compensation current proportional gain coefficient corresponding to the preset rotating speed range;
s3: taking the optimal value of the corresponding DQ compensation current proportional gain coefficient as the current DQ compensation current proportional gain coefficient of the inverter air conditioner compressor, and returning to execute S2;
wherein, the step S1 specifically includes:
s11: under the condition of an intermediate refrigeration working condition, changing the DQ compensation current proportional gain coefficient, detecting the corresponding power and energy efficiency of the variable-frequency air-conditioning compressor, and collecting corresponding statistical data and the rotating speed value of the compressor at the current stage;
s12: analyzing the optimal value of the DQ compensation current proportional gain coefficient corresponding to the rotating speed value of the variable frequency air conditioner compressor under the intermediate refrigeration working condition according to the statistical data;
s13: under the condition of a rated refrigeration working condition, changing the DQ compensation current proportional gain coefficient, detecting the corresponding power and energy efficiency of the inverter air-conditioning compressor, and collecting corresponding statistical data and the rotating speed of the inverter air-conditioning compressor at the current stage;
s14: and analyzing the optimal value of the DQ compensation current proportional gain coefficient corresponding to the rotating speed value of the variable-frequency air conditioner compressor under the rated refrigeration working condition through the statistical data.
2. The method of claim 1, wherein the predetermined number of speed ranges is plural.
3. The method of claim 2, wherein the plurality of predetermined speed ranges are grouped into a continuous range.
4. The method of claim 2, wherein the plurality of predetermined speed ranges are grouped into discrete ranges.
5. The method of claim 2, wherein the number of the predetermined speed ranges is 2.
6. The method of claim 2, wherein the number of the predetermined speed ranges is 3.
7. The method of claim 2, wherein the number of the predetermined speed ranges is 4.
8. The method of claim 2, wherein the number of the predetermined speed ranges is 5.
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| CN104320032B (en) * | 2014-09-30 | 2017-03-29 | 海信科龙电器股份有限公司 | A kind of AC/AC (alternating current) variable-frequency air conditioning control method and controller |
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