CN114439767A - Variable frequency adjusting method of fan - Google Patents
Variable frequency adjusting method of fan Download PDFInfo
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- CN114439767A CN114439767A CN202111620795.2A CN202111620795A CN114439767A CN 114439767 A CN114439767 A CN 114439767A CN 202111620795 A CN202111620795 A CN 202111620795A CN 114439767 A CN114439767 A CN 114439767A
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000006243 chemical reaction Methods 0.000 claims description 10
- WYROLENTHWJFLR-ACLDMZEESA-N queuine Chemical compound C1=2C(=O)NC(N)=NC=2NC=C1CN[C@H]1C=C[C@H](O)[C@@H]1O WYROLENTHWJFLR-ACLDMZEESA-N 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 5
- 230000003044 adaptive effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The invention relates to a variable frequency adjusting method of a fan, which comprises the following steps: judging whether the fan normally operates, if so, entering the step S2; if not, the frequency output value F is made 0, and the process proceeds to step S6; calculating the opening Vwind of the air valve, and determining the weight coefficient Kwind of the air valve according to the average air density of the air outlet of the fan; calculating a frequency adjustment base number Q according to the air valve opening Vwind and the air valve weight coefficient Kwind obtained in the step S2; calculating a frequency output value F of the frequency converter according to the frequency adjustment base number Q in the step S3; sending the frequency output value F to a frequency converter, and adjusting the frequency of the fan to be the value F by the frequency converter; and switching off a switch at the output side of the frequency converter, switching on a bypass power frequency switch and switching off a switch at the input side of the frequency converter, and switching the fan to a power frequency running state. The method can adjust the air quantity of the fan below 60% and has high adjustment precision.
Description
Technical Field
The invention relates to the technical field of fan operation, in particular to a variable frequency adjusting method of a fan.
Background
With the serious surplus of the power grid capacity, the peak load regulation of the unit becomes inevitable, however, the long-term low-load operation phenomenon is difficult to improve in a short period, so that the low-load operation working condition of the auxiliary machine deviates from an economic area, and the plant power utilization rate is high.
With the rapid development of power electronic technology, computer and automatic control technology, the alternating current speed regulation instead of direct current speed regulation and the computer digital control technology instead of analog control technology have become development trends, so that the alternating current variable frequency speed regulation technology of the motor becomes a main means for saving electricity and promoting the technological progress at present.
The high-voltage AC frequency-conversion speed-regulating technique is a new type of electric transmission speed-regulating technique which has been developed rapidly since the 90 s.c. of 20 th century, and is mainly used for frequency-conversion speed regulation of AC motor, and its technique and performance are superior to any other speed-regulating mode (for example, pole-changing speed-regulating, slip speed-regulating, internal feedback cascade speed-regulating and hydraulic coupler speed-regulating). The variable frequency speed regulation obtains the approval of the majority of users and the confirmation of the market with the obvious energy-saving benefit, higher speed regulation precision, wider speed regulation range, perfect power electronic protection function and easy-to-realize automatic communication function, brings great convenience and economic benefit to the users in the aspects of safe and reliable operation, convenient installation and use, small workload of maintenance and the like, and becomes the preferred scheme for saving energy of motor systems of enterprises at home and abroad.
In the method for adjusting the air volume of the variable frequency fan in the prior art, the air volume adjusting range is 60-100%, but in the actual process, the air volume of the fan is required to be adjusted to be below 60%, so that the method for adjusting the air volume of the variable frequency fan in the prior art cannot meet the actual requirement.
Disclosure of Invention
The invention aims to provide a variable frequency adjusting method of a fan, which can adjust the air quantity of the fan below 60% and has high adjusting precision.
The invention adopts the technical scheme that a variable frequency adjusting method of a fan is operated by a fan adjusting system, the fan adjusting system comprises the fan, a pipeline arranged at an air outlet of the fan, an air speed sensor arranged in the pipeline, a frequency converter input side switch, a frequency converter output side switch and a bypass power frequency switch, the frequency converter output side switch is connected with the fan, one end of the bypass power frequency switch is connected with the frequency converter input side switch, and the other end of the bypass power frequency switch is connected with the fan, the method comprises the following steps:
s1, judging whether the fan is in normal operation, if so, entering the step S2; if not, the process advances to step S6, where the frequency output value F is set to 0;
s2, calculating the opening Vwind of the air valve, and determining the weight coefficient Kwind of the air valve according to the average air density of the air outlet of the fan;
s3, calculating a frequency adjustment base number Q according to the air valve opening Vwind and the air valve weight coefficient Kwind obtained in the step S2;
s4, calculating the frequency output value F of the frequency converter according to the frequency adjusting base number Q in the step S3;
s5, sending the frequency output value F to a frequency converter, and adjusting the frequency of the fan to be the value F by the frequency converter;
and S6, switching off a switch at the output side of the frequency converter, switching on a bypass power frequency switch and switching off a switch at the input side of the frequency converter, and switching the fan to a power frequency running state.
The invention has the beneficial effects that: according to the frequency conversion adjusting method of the fan, when the fan normally operates, the frequency of the frequency converter is adjusted by acquiring the air volume in the pipeline in real time, so that the air volume of the fan can be adjusted below 60%, and the adjusting precision is high; when the fan is not in normal operation, the fan is directly switched to a power frequency operation state. The frequency conversion adjusting method of the fan is simple, and the adjusting precision of frequency conversion adjustment is improved.
Preferably, in step S4, the frequency adjustment base Q is calculated by the following formula: q ═ Vwind ═ Kwind)/(Vwind ═ 100)
Preferably, in step S5, the frequency output value F is calculated by the formula:
Preferably, in step S2, the specific process of calculating the damper opening Vwind includes the following steps:
s21, setting a desired air quantity value;
s22, acquiring real-time air volume in the pipeline through the air speed sensor, comparing the real-time air volume with expected air volume, and calculating a deviation value of the real-time air volume and the expected air volume;
and S23, inputting the deviation value obtained in the step S22 into a fuzzy self-adaptive PID controller, calculating PID parameter increment of the air valve opening Vwind, and obtaining the air valve opening Vwind after output correction.
Drawings
Fig. 1 is a flow chart of a variable frequency regulation method of a fan according to the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings in combination with specific embodiments so that those skilled in the art can practice the invention with reference to the description, and the scope of the invention is not limited to the specific embodiments.
The fan of the power plant is used for conveying and drying pulverized coal and supplying air required in the initial stage of fuel combustion, and belongs to a very important load, so that an electric main loop of a frequency converter of the fan is often set to a mode that the frequency converter carries an automatic power frequency bypass.
The invention relates to a frequency conversion adjusting method of a fan, which is operated by a fan adjusting system, wherein the fan adjusting system comprises the fan, a pipeline arranged at an air outlet of the fan, an air speed sensor arranged in the pipeline, a frequency converter input side switch, a frequency converter output side switch and a bypass power frequency switch, the frequency converter output side switch is connected with the fan, one end of the bypass power frequency switch is connected with the frequency converter input side switch, and the other end of the bypass power frequency switch is connected with the fan, as shown in figure 1, the method comprises the following steps:
s1, judging whether the fan is in normal operation, if so, entering the step S2; if not, the frequency output value F is made 0, and the process proceeds to step S6;
s2, calculating the opening Vwind of the air valve, and determining the weight coefficient Kwind of the air valve according to the average air density of the air outlet of the fan; the average air density reflects the wind power density at the same wind speed;
s3, calculating a frequency adjustment base number Q according to the air valve opening Vwind and the air valve weight coefficient Kwind obtained in the step S2;
s4, calculating the frequency output value F of the frequency converter according to the frequency adjusting base number Q in the step S3;
s5, sending the frequency output value F to a frequency converter, and adjusting the frequency of the fan to be the value F by the frequency converter;
and S6, switching off a switch at the output side of the frequency converter, switching on a bypass power frequency switch and switching off a switch at the input side of the frequency converter, and switching the fan to a power frequency running state.
According to the frequency conversion adjusting method of the fan, when the fan normally operates, the frequency of the frequency converter is adjusted by acquiring the air volume in the pipeline in real time, so that the air volume of the fan can be adjusted below 60%, and the adjusting precision is high; when the fan is not in normal operation, the fan is directly switched to a power frequency operation state. The frequency conversion adjusting method of the fan is simple, and the adjusting precision of frequency conversion adjustment is improved.
In step S4, the frequency adjustment base Q is calculated by the formula: q ═ Vwind ═ Kwind)/(Vwind ═ 100).
In step S5, the frequency output value F is calculated by the formula:
In step S2, the specific process of calculating the damper opening Vwind includes the following steps:
s21, setting a desired air quantity value;
s22, acquiring real-time air volume in the pipeline through the air speed sensor, comparing the real-time air volume with expected air volume, and calculating a deviation value of the real-time air volume and the expected air volume;
and S23, inputting the deviation value obtained in the step S22 into a fuzzy self-adaptive PID controller, calculating the PID parameter increment of the air valve opening Vwind, and outputting and correcting to obtain the air valve opening Vwind.
In a specific embodiment, when the air volume value acquired in real time is large, the opening degree of an air valve is increased, and the air volume of a fan is positively correlated with the opening degree of the air valve; when the air volume is increased, the running frequency of the frequency converter is increased. When the fan normally operates, the frequency converter is adopted to control the air supply frequency of the fan, the air quantity can be effectively adjusted in a sectional mode, and the frequency of the frequency converter is dynamically adjusted by adopting the opening degree of the valve, so that the air supply quantity meets the current requirement, namely the air quantity of the fan meets the requirement of being adjusted below 60%, and the resource waste caused by excessive air supply can be avoided.
A fuzzy adaptive PID control method for fuzzy adaptive PID controller features that the basic fuzzy mathematic theory and method are used, the rule conditions and operation are expressed by fuzzy set, the fuzzy control rules and relative information are stored in computer knowledge base, and the control action is performed in if-then mode.
Claims (4)
1. The utility model provides a frequency conversion control method of fan, is operated by fan governing system, fan governing system includes the fan, sets up at the pipeline of the air outlet of fan, sets up air velocity transducer, converter input side switch, converter output side switch and bypass power frequency switch in the pipeline, converter output side switch is connected with the fan, bypass power frequency switch one end is connected with converter input side switch, and the other end is connected with the fan, its characterized in that: the method comprises the following steps:
s1, judging whether the fan normally operates, if so, entering the step S2; if not, the frequency output value F is made 0, and the process proceeds to step S6;
s2, calculating the opening Vwind of the air valve, and determining the weight coefficient Kwind of the air valve according to the average air density of the air outlet of the fan;
s3, calculating a frequency adjustment base number Q according to the air valve opening Vwind and the air valve weight coefficient Kwind obtained in the step S2;
s4, calculating the frequency output value F of the frequency converter according to the frequency adjusting base number Q in the step S3;
s5, sending the frequency output value F to a frequency converter, and adjusting the frequency of the fan to be the value F by the frequency converter;
and S6, switching off a switch at the output side of the frequency converter, switching on a bypass power frequency switch and switching off a switch at the input side of the frequency converter, and switching the fan to a power frequency running state.
2. The variable frequency adjustment method of the fan according to claim 1, characterized in that: in step S4, the frequency adjustment base Q is calculated by the formula: q ═ Vwind ═ Kwind)/(Vwind ═ 100).
3. The variable frequency adjustment method of the fan according to claim 2, characterized in that: in step S5, the frequency output value F is calculated by the formula:
4. The variable frequency regulation method of the fan according to claim 1, characterized in that: the specific process for calculating the opening Vwind of the air outlet valve comprises the following steps:
s21, setting a desired air quantity value;
s22, acquiring real-time air volume in the pipeline through the air speed sensor, comparing the real-time air volume with expected air volume, and calculating a deviation value of the real-time air volume and the expected air volume;
and S23, inputting the deviation value obtained in the step S22 into a fuzzy self-adaptive PID controller, calculating the PID parameter increment of the air valve opening Vwind, and outputting and correcting to obtain the air valve opening Vwind.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111620795.2A CN114439767A (en) | 2021-12-28 | 2021-12-28 | Variable frequency adjusting method of fan |
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| CN202111620795.2A CN114439767A (en) | 2021-12-28 | 2021-12-28 | Variable frequency adjusting method of fan |
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| CN114439767A true CN114439767A (en) | 2022-05-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114680372A (en) * | 2022-05-26 | 2022-07-01 | 南华大学 | Pneumatic conveying control method, computer readable medium, pneumatic conveying control system and tobacco shred pneumatic conveying system |
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| CN103528144A (en) * | 2013-10-11 | 2014-01-22 | 广州市设计院 | Fresh air variable air rate energy saving method and device based on absolute humidity control |
| CN104329281A (en) * | 2014-10-20 | 2015-02-04 | 东方日立(成都)电控设备有限公司 | Variable frequency energy-saving system for movable blade adjustable type induced draft fan |
| CN104949283A (en) * | 2015-06-30 | 2015-09-30 | 上海卓思智能科技有限公司 | Air valve adjusting method and system for controlling air volume |
| CN205448152U (en) * | 2015-12-25 | 2016-08-10 | 赵曼 | Air quantity regulator |
| CN206206235U (en) * | 2016-10-28 | 2017-05-31 | 广东粤电云河发电有限公司 | A kind of electric control loop of Fan for Boiler in Power Plant |
| CN106871351A (en) * | 2017-02-17 | 2017-06-20 | 河南牧业经济学院 | A kind of frequency conversion air blowing control method of air-conditioning system |
| CN108266398A (en) * | 2017-01-03 | 2018-07-10 | 新疆知信科技有限公司 | Stable operation method during primary air fan frequency conversion cut frequency |
| CN214228150U (en) * | 2021-02-26 | 2021-09-17 | 西安热工研究院有限公司 | Frequency conversion and power frequency automatic switching device for induced draft fan of garbage power plant |
-
2021
- 2021-12-28 CN CN202111620795.2A patent/CN114439767A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103528144A (en) * | 2013-10-11 | 2014-01-22 | 广州市设计院 | Fresh air variable air rate energy saving method and device based on absolute humidity control |
| CN104329281A (en) * | 2014-10-20 | 2015-02-04 | 东方日立(成都)电控设备有限公司 | Variable frequency energy-saving system for movable blade adjustable type induced draft fan |
| CN104949283A (en) * | 2015-06-30 | 2015-09-30 | 上海卓思智能科技有限公司 | Air valve adjusting method and system for controlling air volume |
| CN205448152U (en) * | 2015-12-25 | 2016-08-10 | 赵曼 | Air quantity regulator |
| CN206206235U (en) * | 2016-10-28 | 2017-05-31 | 广东粤电云河发电有限公司 | A kind of electric control loop of Fan for Boiler in Power Plant |
| CN108266398A (en) * | 2017-01-03 | 2018-07-10 | 新疆知信科技有限公司 | Stable operation method during primary air fan frequency conversion cut frequency |
| CN106871351A (en) * | 2017-02-17 | 2017-06-20 | 河南牧业经济学院 | A kind of frequency conversion air blowing control method of air-conditioning system |
| CN214228150U (en) * | 2021-02-26 | 2021-09-17 | 西安热工研究院有限公司 | Frequency conversion and power frequency automatic switching device for induced draft fan of garbage power plant |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114680372A (en) * | 2022-05-26 | 2022-07-01 | 南华大学 | Pneumatic conveying control method, computer readable medium, pneumatic conveying control system and tobacco shred pneumatic conveying system |
| CN114680372B (en) * | 2022-05-26 | 2022-11-22 | 南华大学 | Pneumatic conveying control method, computer readable medium, pneumatic conveying control system and tobacco shred pneumatic conveying system |
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