CN101526260B - Variable-frequency air-conditioner control method and control device thereof - Google Patents
Variable-frequency air-conditioner control method and control device thereof Download PDFInfo
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- 238000004378 air conditioning Methods 0.000 claims abstract description 57
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- 238000005057 refrigeration Methods 0.000 description 5
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- 238000010438 heat treatment Methods 0.000 description 3
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Abstract
Description
Technical field
The present invention relates to the control system field of conditioner, is a kind of convertible frequency air-conditioner control method and control device specifically.
Background technology
Convertible frequency air-conditioner is controlled indoor temperature and is reached purpose of energy saving by changing compressor frequency, generally adopts following two kinds of control modes:
First tradition control method, transducer air conditioning is regulated the frequency of compressor according to the difference of design temperature and indoor temperature, the frequency conversion scope that is about to compressor is divided into several segments, regulates the frequency that certain temperature approach is corresponding specific on a large scale downward or upward.This control method can cause air-conditioner air-conditioning fan-out capability not conform to real indoor load, causes the compressor operation of back and forth beating between different frequency, and room temperature is centered around the design temperature place and back and forth shakes.
It two is fuzzy control methods, can address the above problem, but still there is certain defective: on the one hand, because the relative air-conditioning output of ambient parameter has certain hysteresis quality, carry out frequency modulation control with indoor and outdoor surroundings parameter and variation tendency thereof as feedback parameter, its measurement data lags behind, not with the performance parameter of air-conditioner itself be the air-conditioning fan-out capability as feedback parameter, cause low-response, overshoot big; On the other hand, fuzzy controller can not carry out online adjustment as weighted factor to the system core parameter, and its adaptivity is more weak, and the indoor temperature model is easy to be subjected to the influence of external environment, and this causes indoor comfort and air-conditioner energy-efficient performance not to meet the demands fully.
Summary of the invention
The object of the invention is, a kind of convertible frequency air-conditioner control method is provided, and can overcome existing convertible frequency air-conditioner FREQUENCY CONTROL hysteresis, low-response, drawback that overshoot is big; On this basis, the present invention also provides a kind of convertible frequency air-conditioner control device.
For solving above technical problem, convertible frequency air-conditioner control method provided by the invention comprises:
Obtain indoor temperature and humidity;
According to indoor temperature and humidity, calculate the measured value of the temperature difference, difference variation rate and the air-conditioning fan-out capability rate of change of indoor temperature and design temperature, as the input parameter of fuzzy control;
The measured value of the temperature difference, difference variation rate and air-conditioning fan-out capability rate of change is quantized respectively, obtain the conversion value of the temperature difference on the corresponding domain, difference variation rate and air-conditioning fan-out capability rate of change;
According to the conversion value of the temperature difference, difference variation rate and air-conditioning fan-out capability rate of change,, calculate and the output compressor frequency according to predetermined fuzzy control rule.
Preferably, by calculating the weighted sum of the temperature difference, difference variation rate and air-conditioning fan-out capability rate of change conversion value, obtain described compressor frequency.
Preferably, according to temperature difference conversion value, the weight coefficient of the temperature difference, difference variation rate and air-conditioning fan-out capability rate of change conversion value is adjusted.
Preferably, by detecting temperature and the humidity of indoor set, obtain indoor temperature and humidity into and out of the air port.
Convertible frequency air-conditioner control device provided by the invention comprises:
Temperature, humidity measurement are popped one's head in, and are used to detect and export the measured value of indoor temperature and humidity;
Data processing unit is used for according to indoor temperature and humidity, calculates the measured value of the temperature difference, difference variation rate and the air-conditioning fan-out capability rate of change of indoor temperature and design temperature, as the input parameter of fuzzy control;
Quantifying unit is used for the measured value of the temperature difference, difference variation rate and air-conditioning fan-out capability rate of change is quantized respectively, obtains the conversion value of the temperature difference on the corresponding domain, difference variation rate and air-conditioning fan-out capability rate of change;
Fuzzy controller is used for the conversion value according to the temperature difference, difference variation rate and air-conditioning fan-out capability rate of change, according to predetermined fuzzy control rule, calculates and the output compressor frequency.
Preferably, the increment of described compressor frequency is the weighted sum of the temperature difference, difference variation rate and air-conditioning fan-out capability rate of change conversion value.
Preferably, the weight coefficient of the described temperature difference, difference variation rate and air-conditioning fan-out capability rate of change conversion value is the line shape function of the temperature difference.
Preferably, described temperature, humidity measurement probe are separately positioned on indoor set into and out of the position, air port.
Preferably, default fuzzy decision table in the described fuzzy controller compares by conversion value and fuzzy decision table with the temperature difference, difference variation rate and air-conditioning fan-out capability rate of change, obtains compressor frequency.
Compared with prior art, the present invention is refrigerating capacity or heating capacity rate of change by the temperature difference, difference variation rate and the air-conditioning fan-out capability that detects indoor temperature, humidity calculating indoor temperature and design temperature, three input parameters as fuzzy control, make compressor on the basis of previous moment running frequency size, can intelligently judge indoor load, and provide appropriate frequency in good time, avoid control hysteresis, low-response, drawback that overshoot is big thus largely.
Especially, the present invention adopts online self-adjusting FUZZY ALGORITHMS FOR CONTROL, compare with general fuzzy control method with traditional control method, the present invention has stronger robustness, can make room temperature reach setting value and stable maintenance on setting value, reach control accuracy height, transient process is good, comfortableness is high desired effects with fast speeds.
Description of drawings
Fig. 1 is the flow chart of convertible frequency air-conditioner control method of the present invention;
Fig. 2 is the composition diagram of convertible frequency air-conditioner control device of the present invention;
Fig. 3 one has the cross-sectional view of the convertible frequency air-conditioner indoor set of control device of the present invention;
Fig. 4 is the front view of the described convertible frequency air-conditioner indoor set of Fig. 3.
The specific embodiment
Basic design of the present invention is, with the input parameter of air-conditioning fan-out capability as fuzzy control; And then suitable control system Self-adjustment Factor is set.
Describe below in conjunction with accompanying drawing and specific embodiment.
See also Fig. 1, this figure is the flow chart of convertible frequency air-conditioner control method of the present invention, specifically may further comprise the steps:
S101, obtain indoor temperature and humidity.
Usually, at indoor set corresponding humiture test probe is set into and out of the air port; By detecting temperature and the humidity of indoor set, obtain indoor temperature and humidity, as the measured value basic data of the temperature difference, difference variation rate and the air-conditioning fan-out capability rate of change that calculate indoor temperature and design temperature into and out of the air port.
S102, according to indoor temperature and humidity, calculate the measured value of the temperature difference, difference variation rate and the air-conditioning fan-out capability rate of change of indoor temperature and design temperature, as the input parameter of fuzzy control.
After obtaining indoor temperature and humidity data, can calculate the measured value of the temperature difference, difference variation rate (derivative) and the air-conditioning fan-out capability rate of change (derivative) of indoor temperature and design temperature according to relevant Mathematical Modeling, chart or curve etc., for example:
Calculate enthalpy h1, the h2 that imports and exports air by measured indoor temperature, hygrometer earlier, its enthalpy difference is
Δh＝h2-h1。
Described enthalpy h is by air themperature T and relative humidity Determine that the reckoning process is as follows:
p Q0=EXP (5800.2206/ (T Temperature+ 273.15)+1.3914993-0.04860239* (T Temperature+ 273015)
p q=p Q0-0.0006635* (T-T Temperature) * p 0* 1000
d＝0.622p q/(1000p 0-p q)
h＝1005T+1000*(2501+1.84T)*d
Wherein,
p Q0---the saturated vapor partial pressure;
p q---steam partial pressure;
D---water capacity.
Measure the pairing MAF G of the various rotation speed n of indoor set by experiment again, obtain refrigeration or heating capacity
Q＝Δh*G。
Particularly, can be by the corresponding down certain air quantity L (m of the certain rotating speed of test determination indoor fan 3/ h), calculating refrigeration (heat) amount Q again, formula is as follows:
Q＝ρ*L*Δh
ρ---atmospheric density (kg/m3)
At last, calculate difference DELTA T, the difference variation rate Δ T of room temperature and design temperature C, air-conditioning fan-out capability rate of change Q C, wherein:
Δ T=T Set-T Room temperature
Thus, with difference DELTA T, the difference variation rate Δ T of room temperature and design temperature C, air-conditioning fan-out capability rate of change Q CBeing input parameter, is output parameter with compressor frequency f, determines that the present invention controls input/output variable.
For Fuzzy control system, need to above-mentioned input parameter obfuscation, particularly:
At first determine input variable temperature difference E, difference derivative EC, air-conditioning fan-out capability derivative F, wherein,
E (represents Δ T=T Set(k)-T Room temperature(k))
Further, also need select fringe, ambiguity in definition collection linguistic variable basic domain, determine quantizing factor and scale factor, set up linguistic variable assignment table, extraction and formulate fuzzy control rule, make up Fuzzy control system of the present invention thus.Knowledge about the Fuzzy control system framework is prior art, can not repeat them here specifically with reference to relevant document.
S103, the measured value of the temperature difference, difference variation rate and air-conditioning fan-out capability rate of change is quantized respectively, obtain the conversion value of the temperature difference on the corresponding domain, difference variation rate and air-conditioning fan-out capability rate of change.
Particularly, quantizing factor can be among the present invention
K E＝1、K EC＝100、K F＝300，
E＝K E*ΔT、EC＝K E*ΔT C、F＝K F*Q C。
Preferably, the equal round number of three, domain is 7 grades, promptly
E＝EC＝F＝{-3，-2，-1，0，1，2，3}
S104, according to the conversion value of the temperature difference, difference variation rate and air-conditioning fan-out capability rate of change, according to predetermined fuzzy control rule, calculate also output compressor frequency.
The conversion value of the temperature difference, difference variation rate and air-conditioning fan-out capability rate of change is carried out the computational logic computing according to fuzzy control rule, can obtain the appropriate level value of output quantity, further just can obtain needed controlled quentity controlled variable behind the precision.Certainly, also can obtain the appropriate level value of output quantity by the form of inquiry fuzzy decision table.
Preferably, default fuzzy decision table compares by conversion value and fuzzy decision table with the temperature difference, difference variation rate and air-conditioning fan-out capability rate of change, obtains the increment of compressor frequency, the compressor frequency sum of itself and previous moment is the compressor frequency of current time.By default fuzzy decision table, can reduce amount of calculation, improve control efficiency.
Especially, can obtain described compressor frequency by calculating the weighted sum of the temperature difference, difference variation rate and air-conditioning fan-out capability rate of change conversion value.Preferably, according to temperature difference conversion value, the weight coefficient of the temperature difference, difference variation rate and air-conditioning fan-out capability rate of change conversion value is adjusted, this can improve the adaptive performance of control system.
Described Self-adjustment Factor α can be defined as
The natural number of N---1-5
α n, α 0---constant.
Wherein, α has 5 values that may obtain, and according to the difference variation amplitude, selects suitable coefficient.For certain moment compressor frequency, its final result is determined by following formula:
f (k+1)＝f (k)+α*E+(0.6-α/2)*EC+(0.4-α/2)*F
f (k)---the running frequency of previous moment compressor.
Obviously, this self-adjusting process meets the thinking characteristic of people in the control decision process, has had the characteristics of optimization, and is easy to realize real-time control.
Convertible frequency air-conditioner control method of the present invention, in test indoor set inlet and outlet temperature, humidity, and calculate refrigerating capacity or heating capacity, as an input parameter of fuzzy control, in conjunction with detection, in three-dimensional fuzzy controller, adopt online self-adjusting FUZZY ALGORITHMS FOR CONTROL to room temperature and variation thereof.Compare with general FUZZY ALGORITHMS FOR CONTROL with traditional control method, the present invention has stronger robustness, on the basis of previous moment running frequency size, intelligentized judgement indoor load also provides appropriate frequency in good time, control hysteresis, low-response, drawback that overshoot is big have been avoided largely, make room temperature reach setting value and stable maintenance in setting value, reach control accuracy height, transient process is good, comfortableness is high effect with fast speeds.
On the basis of the above, below convertible frequency air-conditioner control device of the present invention is described.
See also Fig. 2, this figure is the composition diagram of convertible frequency air-conditioner control device of the present invention.This convertible frequency air-conditioner control device comprises:
Temperature test probe 2, humidity measurement probe 1 are separately positioned on indoor set into and out of the position, air port, are used to detect and export the measured value of indoor temperature and humidity;
Data processing unit 3 is used for according to indoor temperature and humidity, calculates the measured value of the temperature difference, difference variation rate and the air-conditioning fan-out capability rate of change of indoor temperature and design temperature, as the input parameter of fuzzy control;
Quantifying unit 4 is used for the measured value of the temperature difference, difference variation rate and air-conditioning fan-out capability rate of change is quantized respectively, obtains the conversion value of the temperature difference on the corresponding domain, difference variation rate and air-conditioning fan-out capability rate of change;
Fuzzy controller 5 is used for the conversion value according to the temperature difference, difference variation rate and air-conditioning fan-out capability rate of change, according to predetermined fuzzy control rule, calculates and the output compressor frequency.Usually, in the time of can setting the temperature difference and meet the following conditions, start fuzzy controller 5,
During-3 ℃≤Δ T≤3 ℃.
Preferably, default fuzzy decision table in the fuzzy controller 5 compares by conversion value and fuzzy decision table with the temperature difference, difference variation rate and air-conditioning fan-out capability rate of change, obtains compressor frequency.Wherein:
The compressor frequency of current time is the compressor frequency and the compressor frequency increment sum of previous moment; Described compressor frequency increment is the weighted sum of the temperature difference, difference variation rate and air-conditioning fan-out capability rate of change conversion value; Preferably, the weight coefficient of the described temperature difference, difference variation rate and air-conditioning fan-out capability rate of change conversion value is the line shape function of the temperature difference, to improve the self application ability.
In this air conditioning control device running, compressor 6 turns round according to resulting compressor frequency, by indoor heat exchanger 7 effect, regulate indoor temperature and also make its stable maintenance on setting value, have control accuracy height, transient process is good, comfortableness is high characteristics.
See also Fig. 3, Fig. 4, wherein: Fig. 3 one has the cross-sectional view of the convertible frequency air-conditioner indoor set of control device of the present invention; Fig. 4 is the front view of the described convertible frequency air-conditioner indoor set of Fig. 3.Air inlet 9, air outlet 10 places all are provided with temperature test probe 2, humidity measurement probe 1, and measured temperature data is used for fuzzy control.According to control method of the present invention, compressor 6 is compressed refrigerant steam by the expectation frequency run; Simultaneously, axial-flow fan 8 constantly enters air, by with indoor heat exchanger 7 heat exchange, regulate indoor temperature.
As shown in Figure 4, refrigerating capacity is set on indoor unit panel in addition shows that charactron 11, temperature show charactron 12, can demonstrate real-time refrigeration (heat) amount and indoor temperature, easy to use, directly perceived.
Be example with the refrigeration below, the operation of air conditioner process described:
Setting room temperature is 27 ℃, and original room temperature is higher than 30 ℃.The compressor high frequency operation of start back, room temperature reaches 30 ℃ rapidly, at this moment,
ΔT＝-3℃。
Because of satisfying entry condition, start fuzzy controller this moment, and compressor frequency is calculated as follows,
f (k+1)＝f (k)+α*E+(0.6-α/2)*EC+(0.4-α/2)*F
Because E gets minimum of a value-3, EC＜0, F＞0, k=0 has
f (1)＜f (0)
Thus, compressor frequency is reduced.In that room temperature progressively is cooled to by 30 ℃ in 27 ℃ the temperature-fall period, have a plurality of trim step, promptly
f (k+1)＜f (k)，...，f (k+1)＜f (k)。
After the trickle overshoot of experience and stablizing, final making
T＝27℃。
At this moment, the E value is 0, and EC and F are 0 also, have
f (k+1)＝f (k)
Thus, compressor frequency is constant, finally makes indoor maintaining constant temperature.Heat process in contrast, do not repeat them here.
The present invention proposes to be changed to one according to key element with what refrigeration (heat) was measured, and adopts three-dimensional fuzzy algorithmic approach decision compressor frequency, makes room temperature reach design temperature rapidly, and is stabilized in setting value; Have precise control, fast, the little characteristics of overshoot of response, thereby satisfy the control accuracy height, transient process is good, the requirement that comfortableness is high; Help alleviating the loss of compressor, conserve energy.
Only be preferred implementation of the present invention below, should be pointed out that above-mentioned preferred implementation should not be considered as limitation of the present invention, protection scope of the present invention should be as the criterion with claim institute restricted portion.For those skilled in the art, without departing from the spirit and scope of the present invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
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