CN103047166A - Blower control system during power frequency/frequency conversion switching of high-voltage frequency converter - Google Patents
Blower control system during power frequency/frequency conversion switching of high-voltage frequency converter Download PDFInfo
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- CN103047166A CN103047166A CN2013100204790A CN201310020479A CN103047166A CN 103047166 A CN103047166 A CN 103047166A CN 2013100204790 A CN2013100204790 A CN 2013100204790A CN 201310020479 A CN201310020479 A CN 201310020479A CN 103047166 A CN103047166 A CN 103047166A
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Abstract
The invention discloses a blower control system during power frequency/frequency conversion switching of a high-voltage frequency converter. The system comprises a control system which is connected to the high-voltage frequency converter and a damper regulator which is arranged between the control system and a blower damper, wherein the control system is used for receiving operation signals which are transmitted by the high-voltage frequency converter and retransmitting damper opening control signals which are transmitted by the high-voltage frequency converter to the damper regulator, and the damper regulator is used for controlling the opening of the blower damper by using damper opening control signals. During power frequency/frequency conversion switching of the high-voltage frequency converter, damper opening control signals which are transmitted by a Data Communication System (DSD) to the damper regulator is used for controlling the opening of the blower damper, the air supplying amount during output of the power frequency is the same with the air supplying amount during output of the frequency conversion, the air supplying amount is stable, and a boiler cannot explode or cannot be damaged caused by the fact that the boiler is power off or the negative pressure is high.
Description
Technical field
The present invention relates to a kind of control gear of blower fan, be specifically related to a kind of high voltage converter worker/frequency conversion blower fan control system when switching.
Background technique
To be China be called for short the custom of gas compression and gas conveying machinery blower fan, and usually said blower fan comprises ventilator, blower, wind-driven generator etc.Gas compression and gas conveying machinery are that the mechanical energy of rotation is converted to gas pressure energy and kinetic energy, and the machinery that gas is transferred out.The main structural components of blower fan is impeller, casing, intake grill, support, motor, belt pulley, coupling, baffler, driving component etc.
In industrial production and product processing manufacturing industry, Fan Equipment has wide range of applications; Its power consumption and account for 7%～25% of cost of production such as restriction loss and the maintenance, repair expense of valve, baffle plate relevant device is a no small operating cost spending.Along with deepening continuously of economic reform, the continuous aggravation of market competition, energy-saving and cost-reducing one of the important means that reduces production costs, improves the quality of products that already become.
At present, variable-frequency control technique has become a main development direction of Modern Electrical Drive technology.The high-power field that 6kV is above need to utilize high voltage converter that motor is carried out frequency modulation, pressure regulation.High voltage converter can realize that because it has stepless time adjustment, change conventional motors are intelligent electric machine, significant energy-saving benefit, inrush current can be controlled at rated current with interior, non-impact current, impact little to electrical network, reduce the advantages such as mechanical wear, saving maintenance cost, be widely used in the industries such as metallurgy, petrochemical industry, electric power, mining, urban construction and transportation industries.
Based on speed adjusting performance and the power savings of above-mentioned high voltage converter, in the occasion of using blower fan, often the motor with blower fan is connected with high voltage converter, comes the output speed of regulating electric machine by the output frequency that changes high voltage converter, to regulate the wind supply quantity of blower fan.When but existing apparatus breaks down at high voltage converter, by breakdown switch signal of high voltage converter output, cut off frequency variator rear end contactor, and closed power frequency contactor, continued the motor power supply of fan by the power frequency contactor, guarantee that motor remains in operation.But in the high voltage converter fault-free, when normally moving, the air door of blower fan is all opened, and reduces output frequency by high voltage converter, makes the motor low-speed running of blower fan, guarantees the wind supply quantity just-in-time.In the air feed process, if high voltage converter breaks down, high voltage converter can change power frequency output into by the frequency conversion outputting cutting by bypath system, be the motor of blower fan directly by mains supply, motor will very fast from the low frequency change of state to the high frequency state this moment, owing to the rotating speed of the wind supply quantity of blower fan and motor square is directly proportional, along with the rotating speed of motor strengthens fast, then wind supply quantity increases thereupon fast, may cause by boiler flameout or the negative pressure of blower fan air feed excessively, causes the bursting of boilers or damage.
Summary of the invention
The object of the invention provides a kind of high voltage converter worker/frequency conversion blower fan control system when switching, when high voltage converter worker/frequency conversion was switched, blower fan was stable to the wind supply quantity of boiler, avoids the excessive bursting of boilers that causes of boiler flameout or negative pressure or damage.
For achieving the above object, the technical solution used in the present invention is: blower fan control system when a kind of high voltage converter worker/frequency conversion is switched comprises the control system that is connected with high voltage converter, is located at the damper regulator between described control system and the air door of fan;
Wherein, described control system is used for receiving the run signal that described high voltage converter sends, and transmits the throttle opening control signal of being sent by high voltage converter to described damper regulator;
Described damper regulator utilizes described throttle opening control signal to control the aperture of described air door of fan.
In the technique scheme, the power frequency operation signal when the converting operation signal when described run signal comprises described high voltage converter frequency conversion output and power frequency output.
Preferably, described control system is the DCS system.
In the technique scheme, described throttle opening control signal is the analogue signal of 4～20mA.
Control principle of the present invention is as described below:
When (1) high voltage converter normally moves, and according to required wind supply quantity adjustment output frequency, the rotating speed of control motor;
(2) high voltage converter is to the analogue signal of a 4～20mA of DCS system output, throttle opening control signal as blower fan, wherein, when the high voltage converter frequency conversion is exported, send the converting operation signal to the DCS system, the DCS system only stores this throttle opening control signal, does not regulate it to air door and transmits this throttle opening control signal;
When (3) high voltage converter breaks down, switch to manually or automatically power frequency output, and send the power frequency operation signal to the DCS system, then the DCS system transmits the throttle opening control signal to damper regulator, regulate the aperture of air door of fan baffle plate, the wind supply quantity when guaranteeing the output of high voltage converter power frequency is identical with the wind supply quantity of frequency conversion output;
(4) behind the high voltage converter Failure elimination, switch to manually or automatically frequency conversion output, and send the analogue signal of 20mA to the DCS system, converting operation signal as high voltage converter, then the DCS system transmits the throttle opening control signal to damper regulator, regulate the aperture to 100% of air door of fan baffle plate, the wind supply quantity when guaranteeing high voltage converter frequency conversion output is identical with the wind supply quantity of power frequency output.
Because technique scheme is used, the present invention compared with prior art has following advantages:
1. the present invention is when high voltage converter worker/frequency conversion is switched, the throttle opening control signal of utilizing the DCS system to transmit to damper regulator is controlled the aperture of air door of fan, wind supply quantity when making power frequency output is identical with the wind supply quantity of frequency conversion output, wind supply quantity is stable, avoids the excessive bursting of boilers that causes of boiler flameout or negative pressure or damage.
Description of drawings
Fig. 1 is the control principle drawing of the embodiment of the invention one;
Wherein: 1, high voltage converter; 2, DCS system 3, damper regulator 4, air door of fan.
Embodiment
The invention will be further described below in conjunction with drawings and Examples:
Embodiment one: shown in Figure 1, blower fan control system when a kind of high voltage converter worker/frequency conversion is switched comprises the control system that is connected with high voltage converter 1, is located at the damper regulator 3 between described control system 2 and the air door of fan 4.
In the present embodiment, described control system is selected DCS system 2.
Wherein, described DCS system 2 is used for receiving the run signal that described high voltage converter 1 sends, and transmit the throttle opening control signal of being sent by high voltage converter 1 to described damper regulator 3, preferred, described throttle opening control signal is the analogue signal of 4～20mA.
Described damper regulator 3 utilizes described throttle opening control signal to control the aperture of described air door of fan 4.
Power frequency operation signal when the converting operation signal when described run signal comprises described high voltage converter frequency conversion output and power frequency output.
The control principle of the present embodiment is as described below:
When (1) high voltage converter normally moves, and according to required wind supply quantity adjustment output frequency, the rotating speed of control motor;
(2) high voltage converter is to the analogue signal of a 4～20mA of DCS system output, throttle opening control signal as blower fan, wherein, when the high voltage converter frequency conversion is exported, send the converting operation signal to the DCS system, the DCS system only stores this throttle opening control signal, does not regulate it to air door and transmits this throttle opening control signal;
When (3) high voltage converter breaks down, switch to manually or automatically power frequency output, and send the power frequency operation signal to the DCS system, then the DCS system transmits the throttle opening control signal to damper regulator, regulate the aperture of air door of fan baffle plate, the wind supply quantity when guaranteeing the output of high voltage converter power frequency is identical with the wind supply quantity of frequency conversion output;
(4) behind the high voltage converter Failure elimination, switch to manually or automatically frequency conversion output, and send the analogue signal of 20mA to the DCS system, converting operation signal as high voltage converter, then the DCS system transmits the throttle opening control signal to damper regulator, regulate the aperture to 100% of air door of fan baffle plate, the wind supply quantity when guaranteeing high voltage converter frequency conversion output is identical with the wind supply quantity of power frequency output.
The above is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from principle 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.
Claims (4)
1. blower fan control system when a high voltage converter worker/frequency conversion is switched is characterized in that, comprises the control system that is connected with high voltage converter, is located at the damper regulator between described control system and the air door of fan;
Wherein, described control system is used for receiving the run signal that described high voltage converter sends, and transmits the throttle opening control signal of being sent by high voltage converter to described damper regulator;
Described damper regulator utilizes described throttle opening control signal to control the aperture of described air door of fan.
2. blower fan control system when high voltage converter worker according to claim 1/frequency conversion is switched is characterized in that, the power frequency operation signal when the converting operation signal when described run signal comprises described high voltage converter frequency conversion output and power frequency output.
3. blower fan control system when high voltage converter worker according to claim 1/frequency conversion is switched is characterized in that described control system is the DCS system.
4. blower fan control system when high voltage converter worker according to claim 1/frequency conversion is switched is characterized in that described throttle opening control signal is the analogue signal of 4～20mA.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013100204790A CN103047166A (en) | 2013-01-21 | 2013-01-21 | Blower control system during power frequency/frequency conversion switching of high-voltage frequency converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013100204790A CN103047166A (en) | 2013-01-21 | 2013-01-21 | Blower control system during power frequency/frequency conversion switching of high-voltage frequency converter |
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| CN103047166A true CN103047166A (en) | 2013-04-17 |
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| CN2013100204790A Pending CN103047166A (en) | 2013-01-21 | 2013-01-21 | Blower control system during power frequency/frequency conversion switching of high-voltage frequency converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113027802A (en) * | 2021-05-11 | 2021-06-25 | 西安热工研究院有限公司 | Power frequency switching method for fault state of frequency converter of centrifugal fan of power station |
| CN113566231A (en) * | 2021-09-06 | 2021-10-29 | 南京钢铁股份有限公司 | Energy-saving control method for combustion fan of heating furnace |
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2013
- 2013-01-21 CN CN2013100204790A patent/CN103047166A/en active Pending
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| JP2005227132A (en) * | 2004-02-13 | 2005-08-25 | Meidensha Corp | Insulation condition monitoring apparatus and insulation condition monitoring method |
| US20100315188A1 (en) * | 2009-06-15 | 2010-12-16 | Advanced Power Technologies, Llc | Apparatus and method for cooling power transformers |
| CN202182915U (en) * | 2011-07-18 | 2012-04-04 | 李增光 | Energy conservation online monitoring device for frequency converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113027802A (en) * | 2021-05-11 | 2021-06-25 | 西安热工研究院有限公司 | Power frequency switching method for fault state of frequency converter of centrifugal fan of power station |
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| CN113566231A (en) * | 2021-09-06 | 2021-10-29 | 南京钢铁股份有限公司 | Energy-saving control method for combustion fan of heating furnace |
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Application publication date: 20130417 |