CN101957624A - Method and system for controlling air dehumidifier of current transformer of wind power generator - Google Patents
Method and system for controlling air dehumidifier of current transformer of wind power generator Download PDFInfo
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Abstract
The invention relates to a method and a system for controlling an air dehumidifier of a current transformer of a wind power generator. The method comprises the following steps of: heating the inner parts of a current transformer and a case by utilizing a heater positioned on a cooling liquid circulating system and judging whether dehumidification is needed or not according to the temperature difference formed by air in the dehumidifier and the case on a drying system connected to a heat exchanger; mounting at least two temperature sensors in the system; mounting a humidity sensor in the case; mounting a signal amplification relay control unit, needed by data acquisition and control signal output, and a control unit, carried by the current transformer per se, outside the case; calculating a condensation point by utilizing detecting values of the humidity sensor and the temperature sensors which are arranged in the case, comparing the condensation point with the detected temperature of the temperature sensors arranged at a water inlet and judging whether condensate water is generated on the surface parts of the case and the current transformer or not; when the compared and judged numerical value reaches the calculated condensation point, dehumidifying the current transformer; and at the moment, starting the heater to operate for dehumidifying.
Description
Technical field
The present invention relates to the control system of a kind of air dewetting system, is the control system of air dehumidifier in a kind of engine rooms of wind power generators current transformer specifically, and this control system is mainly used in to be controlled the dehumidification system that is positioned at cabinet inside.
Background technology
In such as each industrial circles such as large-scale wind driven generator, offshore drilling, boats and ships, locomotive, air equipments, can use current transformer equipment or equipment.These equipment operations in the climatic environment of complexity and the atrocious weather environment in and by the sea, high altitude localities or the like.Usually large-scale wind driven generator is to need most the application scenario of using current transformer, but large-scale wind driven generator is normally operated in the seashore that has good wind resource again, the sea, and the plateau, on the high mountain, places such as Gobi desert and Plain thereof.In these places, aerogenerator and convertor equipment thereof often are subjected to moisture (mist) (alpine climate), saline and alkaline (marine climate), the influence of temperature variation (day and night and Gobi desert weather).Except improving current transformer components and parts moisture-resistant degree, temperature resistance becomes ability, also will do some dehumidifying as far as possible, and the design of aspects such as adjustment prolongs the serviceable life of current transformer.
Because the application scenario of current transformer generally all is that environmental baseline is more abominable, relatively more extreme, so the design of current transformer cabinet generally all is that tightness is than higher.But Mi Feng words can cause cost than higher fully, reasons such as the frequent maintenance of current transformer and maintenance in addition, and cabinet can not made pressure-tight fully usually.
In common environment, because the current transformer cabinet is not pressure-tight, so temperature is asynchronous with air pressure change and have a temperature contrast formation convection current between cabinet inside air and the cabinet extraneous air.Therefore, cabinet inside can form dewpoint temperature, and moisture can condense and in the cabinet inner accumulated under this temperature.Under marine environment and high mountain environment, the fog moisture is all heavier, in the cabinet of not exclusively sealing in moisture also be that nature is heavier.
The big or condensation vapor of airborne humidity on components and parts in, can significantly shorten the serviceable life of electronic component and can produce corrosion mechanical part.The electric property that the cabinet inside condensate water can arrive the insulation resistance electric capacity that causes electrical equipment changes, to the also change to some extent of performance of electric insulation device.These all can cause components and parts to produce fault and might cause element and even entire equipment all to be damaged.
In case moisture is bigger or mechanical part or electric component when having condensation to produce, the operation of current transformer and danger thereof, cause the power device blast of current transformer easily, and the serviceability and the working stability that have changed current transformer, operation departs from its normal operational factor.In original, lack dehumidifier at cabinet inside, but have temperature sensor and humidity sensor.And control module does not detect cabinet internal temperature and humidity every a period of time, but all is as individual quantities control, opens the cabinet inside well heater when temperature is low excessively, prevents that low temperature from damaging electric component.When humidity surpasses 80% relative humidity, stop current transformer work, but whether can not control, to humidity also not control the generation of condensation.Just in high humidity, stop the current transformer operation.So necessary correction.
Summary of the invention
The objective of the invention is in order to overcome air dehumidifier control mode deficiency in the current transformer of existing blower fan cabin, be the bad problem of air dewetting control effect in the current transformer of solution blower fan cabin, and propose a kind of control method and control system of novel wind generator current transformer air dehumidifier.
The objective of the invention is to be achieved through the following technical solutions: the control method of air dehumidifier in a kind of engine rooms of wind power generators current transformer, the well heater that utilization is positioned on the cooling liquid circulation system heats current transformer and cabinet inside, and judges whether the needs dehumidifying according to the temperature difference of dehumidifier on the drying system that is connected in heat exchanger and the formation of cabinet inside air.In system, be provided with two temperature sensors at least; Simultaneously, be provided with humidity sensor at cabinet inside, the signal that be provided with the output of data acquisition and control signal needs in the cabinet outside amplifies relay control unit, and current transformer itself with control module.The temperature sensor detected value that utilizes humidity sensor and be located at cabinet inside calculates condensation point and compares with the temperature sensor detected temperatures that is located at water inlet, judge whether cabinet and current transformer surface elements have condensate water to generate, if smaller or equal to the condensation point, then this moment, there was condensation in cabinet inside cabinet parts; If greater than the condensation point, this moment, mechanical part did not have condensation to generate.When the numerical value relatively judged reach when calculating condensation point, then need to dehumidify; Starting the well heater operation this moment dehumidifies.The dehumidifier temperature is an ambient temperature value, so be to control by control heater or change pipeline to change the cabinet inside air themperature, the control dehumidifying under the cabinet inside different humidity situation.In addition, behind current transformer, any place of the liquid cooling circulation system also can be provided with the temperature sensor of the leaving water temperature that is used for the tracer liquid cooling recirculation system before the liquid pump, tracer liquid cooling recirculation system leaving water temperature or current transformer mechanical part temperature, whether detected temperatures is too high, if too high and well heater need stop well heater when opening, if this moment, well heater was exactly to cut out or the too high current transformer safe working temperature that surpasses of temperature originally, then need to stop the current transformer operation, prevent that current transformer from damaging.
Control system according to air dehumidifier in the engine rooms of wind power generators current transformer that control method proposed of air dehumidifier in the above-mentioned engine rooms of wind power generators current transformer is: air dehumidifier control device in a kind of current transformer, at least comprise two temperature sensors, one of them is arranged on the temperature sensor of cabinet inside, a temperature sensor that is located at water inlet; Simultaneously, be provided with humidity sensor at cabinet inside, the signal that be provided with the output of data acquisition and control signal needs in the cabinet outside amplifies relay control unit, and current transformer itself with control module.Described temperature sensor, humidity sensor amplify relay control unit with the signal of cabinet outside respectively and are electrically connected by electric wire, and the data-signal of being gathered is sent to signal amplification relay control unit; Synchronous signal amplify relay control unit and stream device itself with control module also be electrically connected by electric wire, and make flow device itself with control module according to the data that the detected control that dehumidifies.
Because the working temperature in the working environment of aerogenerator and the requirement of working relative humidity, and the accuracy requirement of temperature and humidity is not very high, therefore can be by integer relation table typing control module with relative humidity and temperature, and thereby the temperature that detects rounds numerical value humidity and rounds numerical value and calculate approximate dewpoint temperature, the suitable surplus that leaves when comparing with environment temperature is so that can dehumidify thoroughly.
The invention has the beneficial effects as follows, control mode of the present invention and principle can be good at controlling the work of finishing air dehumidifier, this invention can be to environment temperature, the cabinet inside air humidity, whether the mechanical part surface has condensate water to generate, whether water-cooling system water delivering orifice temperature crosses the high environment of dehumidifying that needs is detected, can also analyze the signal of these detections by control module, make the control reaction of dehumidifying: such as the control of cut-offfing to well heater, the control of cut-offfing to the individual channel of T-valve, and by temperature sensor 3, calculate dewpoint temperature with humidity sensor, and temperature sensor 2 between the temperature comparative analysis see if there is condensation and generate.By control housing temperature control effect on moisture extraction.
Description of drawings:
Fig. 1 is the control hardware structural drawing of dehumidifier of the present invention.
Embodiment
The present invention will be further described below in conjunction with drawings and Examples.
Be illustrated in figure 1 as the control hardware structural drawing of dehumidifier.
Shown in this figure in the current transformer of this invention the air dehumidifier control device comprise sensor and two controlled devices of four detections, and data acquisition unit, signal amplifies and relay control unit.The sensor of four detections is respectively first temperature sensor 10, second temperature sensor 5, three-temperature sensor 14 and humidity sensor 13, and described two controlled devices are respectively T-valve 8 and well heater 9.
After first temperature sensor 10 was positioned at current transformer 3 shown in this figure, any place of the liquid cooling circulation system mainly was the leaving water temperature of tracer liquid cooling recirculation system before the liquid pump 6.Tracer liquid cooling recirculation system leaving water temperature or current transformer mechanical part temperature, whether detected temperatures is too high, if too high and well heater need stop well heater when opening, if this moment, well heater 9 was exactly to cut out or the too high current transformer safe working temperature that surpasses of temperature originally, then need to stop the current transformer operation, prevent that current transformer from damaging.
Three-temperature sensor 14 shown in this figure and humidity sensor 13 are positioned at any place of cabinet 2 inside.Because humidity sensor 13 mainly is the air humidity that detects cabinet inside, three-temperature sensor 14 detects the cabinet temperature inside, under the daily temperature difference, the variation of pressure is very little, so be used as constant the processing approx, be approximately linear relationship this moment, and dewpoint temperature is the product of relative humidity and detected temperatures, thereby control module can calculate the dewpoint temperature of cabinet inside this moment.Thereby could determine whether to have on current transformer and the mechanical part condensate water to generate with the comparison of detected temperatures in the temperature sensor 2 that is provided with on the liquid cooling circulation system thus.Further can also determine whether can form effect on moisture extraction in the dehumidifier unit in the dehumidifier.
This control mode need use the control module 11 that current transformer or frequency conversion equipment have, data acquisition unit 17 and signal amplify and relay control 15, just between data acquisition unit 17 and signal amplification and relay control 15, a condensation control device 16 is set, condensation control device 16 is electrically connected with relay control 15 with data acquisition unit 17 and signal amplification respectively, condensation control device 16 is collected the sensor signal that data acquisition unit 17 is gathered respectively, and sends steering order through compare of analysis and amplify and relay control 15 control that dehumidifies to signal.But this control mode is fairly simple, and required control module resource is fewer, and is less for the control influence of current transformer.But data acquisition and the required converter of output also are to share by the original converter of current transformer, and can be by time sharing shared or utilize the vacant resource of converter to finish conversion, and be very little to the original system influence.Because first temperature sensor 10, second temperature sensor 5 and humidity sensor 13 need to detect in real time, promptly to detect at set intervals, so that determine whether environment temperature is lower, and whether the water delivering orifice temperature is too high, whether current transformer moves safety, and whether cabinet needs dehumidifying.Certainly these three sensors, provide cost savings so can utilize the original equipment of system because general current transformer operation needs.
The principle of work of dehumidifier mainly is to utilize temperature difference to dehumidify.Promptly pass through the air themperature of current transformer cabinet 2 inside, passing through heating when the air themperature of current transformer cabinet 2 raises, dehumidifier cooling surface temperature cooling simultaneously is low time the dewpoint temperature, the moisture of current transformer cabinet 2 inside condenses into condensate water at cooling surface, and condensate water is discharged cabinet by the diversion trench or the drainpipe 12 of cooling surface group.This mode by temperature difference is carried out drying and is subjected to environment temperature, the restricted influence of the value of temperature difference.Drying capacity also is that the temperature gap of cooling surface group of the interchanger 1 of the dehumidifier that is connected with drying cycles system 4 with cabinet 2 internal temperatures is directly proportional, and promptly the temperature gap between them is big more, and drying capacity is strong more.When environment temperature is lower, the moisture of current transformer cabinet 2 inside is smaller comparatively speaking, and the condensate water around the equipment is also fewer, this moment, the temperature of the words cooling surface that dehumidifier is opened was basic identical with ambient temperature, be that the cooling surface temperature is lower, but the heat that well heater 9 and current transformer produce is relatively stable, the temperature difference that this moment, cabinet inside air themperature and dehumidifier cooling surface formed is but very big, this moment, dehumidifying effect was very high, and effect is fine.But when environment temperature than higher the time, the moisture of cabinet inside is relatively many.The cooling surface temperature compared higherly when dehumidifier was opened, and the heat that well heater 9 and current transformer produce is constant substantially, or the accumulation temperature rises less.The temperature difference of air themperature and dehumidifier cooling surface group is smaller in the cabinet 2, and this moment, drying capacity was poor.If but this moment, heat exchanger 7 was the liquid/liquid interchanger, effect can be better.Under the situation that temperature difference remains unchanged, if environment temperature is low more, drying capacity is strong more.Therefore drying capacity is more intense when environment temperatures such as night and rainy weather are lower, and used resource is fewer, and this moment, effect on moisture extraction was relatively good.
In order to finish the dehumidifying of dehumidifier, at first need the detection of sensor for temperature and humidity, promptly at first need humidity sensor detection cabinet inner air humidity and judged whether to reach the degree that will dehumidify by control module, if reached the requirement of dehumidifying, and humidity ratio is bigger, control module 11 needs second temperature sensor 5, three-temperature sensor 14 detects the temperature and the cabinet inside temperature of current transformer water-cooling system water inlet, control module 11 can calculate the dewpoint temperature in cabinet this moment by judging current transformer cabinet 2 interior humidity and temperature, judge relatively in the water inlet temperature (promptly close with the dehumidifier temperature with environment temperature) that detects by the dewpoint temperature that calculates and second temperature sensor 5 whether mechanical part has condensate water to generate the while and judge also whether present dehumidifier can dehumidify: (I) be not if the judgement mechanical part has condensate water, certainly this moment, dehumidifier cooling surface temperature did not reach dewpoint temperature certainly yet, can not dehumidify, because environment temperature is constant substantially at short notice, the dehumidifier surface temperature is constant substantially, we just need to improve dewpoint temperature, therefore need heating cabinet internal temperature, make dewpoint temperature improve.Will send signal controlling T-valve 8 by control module and open A-C, close B-C; While heater 9.Every reasonable time, again detect the temperature of humidity and three-temperature sensor 14 and recomputate dewpoint temperature, the temperature that begins to detect with second temperature sensor 5 relatively, know that the dehumidifier temperature is less than dewpoint temperature till, this moment, dehumidifier just can carry out dehumidifying work.In dehumidification process, keep humidity sensor to gather moisture signal in real time and give processor, be lower than processor up to detected humidity the value that dehumidifying requires is set, dehumidifying finishes.This moment, control module was sent signal, closed the A-C end of T-valve 8, opened B-C, closed well heater 9.(II) can be judged if processor judges that mechanical part has condensation production simultaneously, and this moment, dehumidifier also can carry out dehumidifying work.The dehumidifier surface temperature is less than dewpoint temperature this moment.If current transformer heating this moment is abundant, then just need control module to open the A-C of T-valve 8, close the B-C path, make the mechanical part condensate evaporation of current transformer in air.If this moment, the current transformer heating was not enough to evaporation condensed water, the ratio that perhaps requires the mechanical part condensate water to remove is very fast, then need control module to send unblanking well heater 9 heating cabinet internal mechanical part temperature certain hours, condensation is all become airborne moisture, identical with dehumidification operation in (I) then, finish up to dehumidification operation.Certainly this moment, the cabinet inwall also was to be in environment temperature or a little more than environment temperature, the possibility that forms condensation is bigger, generated if any condensation, needed then that condensate water flows out cabinet from refluence groove and single slope drainage valve on the inwall.
This control mode had been than having increased the program of calculating dewpoint temperature originally, with the individual quantities that detected originally and simple high humidity the control break of shutting down for calculating dewpoint temperature and having judged whether that condensation produces, and dehumidifies when humidity ratio is bigger.
When current transformer is in running order, if and control module heater 9, control module needs real-time collecting temperature sensor 1 to detect the temperature data of water-cooling system water delivering orifice, and processor will be made judgement in real time, sees whether surpassed the warning temperature that is provided with, in case temperature is than higher, surpassed the warning temperature, need in time close well heater 9, if the temperature that detects is too high, surpass the current transformer safe working temperature that control module is provided with, also needed in time to stop the operation of current transformer.
In addition, processor be provided with temperature sensor 2 in dehumidification operation not, also to gather at set intervals under temperature data, and import control module into, judge whether environment temperature is lower, promptly be when environment temperature is lower, can dehumidify timely and rapidly and thoroughly, so that save the energy and reach reasonable effect on moisture extraction.
In the lower and current transformer work, the heat that is discharged in the time of need making full use of its work dehumidifies in environment temperature.If this moment three-temperature sensor 14 and humidity sensor 13 detected data computation dewpoint temperatures, if this moment, the dehumidifier temperature was less than dewpoint temperature, can dehumidify, just need not open heating resistor 9, control module be T-valve 8 be that A-C is open-minded, other is all turned off, and just the heat that current transformer discharges in the cabinet also can fall the condensate evaporation of mechanical part, thereby has saved resource consumption.
The present invention has utilized original detection of system and treatment facility fully, has reduced the cost of system, and the energy when having made full use of current transformer work, increases work efficiency, and has improved dehumidifying and control ability.
Above-mentioned explanation has just illustrated basic concept of the present invention and structure substantially.The technician can make suitable change according to different application scenarios in the scope that claim allowed, with the environment that adapts to use and reach good dehumidification effect.
Claims (6)
1. the control method of an aerogenerator current transformer air dehumidifier, it is characterized in that: utilize the well heater that is positioned on the cooling liquid circulation system to current transformer and cabinet inside heating, and judge whether the needs dehumidifying according to the temperature difference of dehumidifier on the drying system that is connected in heat exchanger and the formation of cabinet inside air; In system, be provided with two temperature sensors at least; Simultaneously, be provided with humidity sensor at cabinet inside, the signal that be provided with the output of data acquisition and control signal needs in the cabinet outside amplifies relay control unit, and current transformer itself with control module; The temperature sensor detected value that utilizes humidity sensor and be located at cabinet inside calculates condensation point and compares with the temperature sensor detected temperatures that is located at water inlet, judge whether cabinet and current transformer surface elements have condensate water to generate, if smaller or equal to the condensation point, then this moment, there was condensation in cabinet inside cabinet parts; If greater than the condensation point, this moment, mechanical part did not have condensation to generate; When the numerical value relatively judged reach when calculating condensation point, then need to dehumidify; Starting the well heater operation this moment dehumidifies.
2. the control method of aerogenerator current transformer air dehumidifier as claimed in claim 1 is characterized in that: be to control by control heater or change pipeline to change the cabinet inside air themperature, the control dehumidifying under the cabinet inside different humidity situation.
3. the control method of aerogenerator current transformer air dehumidifier as claimed in claim 2, it is characterized in that: behind current transformer, any place of the liquid cooling circulation system also is provided with the temperature sensor of the leaving water temperature that is used for the tracer liquid cooling recirculation system, tracer liquid cooling recirculation system leaving water temperature or current transformer mechanical part temperature before the liquid pump; Whether detected temperatures is too high, if too high and well heater need stop well heater when opening, if this moment, well heater was exactly to cut out or the too high current transformer safe working temperature that surpasses of temperature originally, then needs to stop the current transformer operation, prevents that current transformer from damaging.
4. as the control method of claim 2 or 3 described aerogenerator current transformer air dehumidifiers, it is characterized in that: in order to finish the dehumidifying of dehumidifier, at first need the detection of sensor for temperature and humidity, promptly at first need humidity sensor detection cabinet inner air humidity and judged whether to reach the degree that will dehumidify by control module, if reached the requirement of dehumidifying, and humidity ratio is bigger, control module needs second temperature sensor, three-temperature sensor detects the temperature and the cabinet inside temperature of current transformer water-cooling system water inlet, control module can calculate the dewpoint temperature in cabinet this moment by judging humidity and temperature in the current transformer cabinet, in the water inlet temperature that detects by the dewpoint temperature that calculates and second temperature sensor 5, promptly close with the dehumidifier temperature with environment temperature, judge relatively whether mechanical part has condensate water to generate and judge also whether present dehumidifier can dehumidify simultaneously:
(1) if judges that mechanical part does not have condensate water, certainly this moment, dehumidifier cooling surface temperature did not reach dewpoint temperature certainly yet, can not dehumidify, because environment temperature is constant substantially at short notice, the dehumidifier surface temperature is constant substantially, we just need to improve dewpoint temperature, therefore need heating cabinet internal temperature, make dewpoint temperature improve; Will send the signal controlling T-valve by control module and open A-C, close B-C; The while heater; Every reasonable time, again detect the temperature of humidity and three-temperature sensor and recomputate dewpoint temperature, the temperature that begins to detect with second temperature sensor relatively, know that the dehumidifier temperature is less than dewpoint temperature till, this moment, dehumidifier just can carry out dehumidifying work; In dehumidification process, keep humidity sensor to gather moisture signal in real time and give processor, be lower than processor up to detected humidity the value that dehumidifying requires is set, dehumidifying finishes; This moment, control module was sent signal, closed the A-C end of T-valve 8, opened B-C, closed well heater;
If processor judges that mechanical part has condensation production, can judge that (2) this moment, dehumidifier also can carry out dehumidifying work simultaneously; The dehumidifier surface temperature is less than dewpoint temperature this moment; If current transformer heating this moment is abundant, then just need control module to open the A-C of T-valve 8, close the B-C path, make the mechanical part condensate evaporation of current transformer in air; If this moment, the current transformer heating was not enough to evaporation condensed water, the ratio that perhaps requires the mechanical part condensate water to remove is very fast, then need control module to send unblanking heater heats cabinet inside mechanical part temperature certain hour, condensation is all become airborne moisture, carry out dehumidification operation then, finish up to dehumidification operation as step (1); This moment, the cabinet inwall generated if any condensation, needed then that condensate water flows out cabinet from refluence groove and single slope drainage valve on the inwall.
5. the control system of an aerogenerator current transformer air dehumidifier, it is characterized in that: comprise two temperature sensors at least, one of them is arranged on the temperature sensor of cabinet inside, a temperature sensor that is located at water inlet; Simultaneously, be provided with humidity sensor at cabinet inside, the signal that be provided with the output of data acquisition and control signal needs in the cabinet outside amplifies relay control unit, and current transformer itself with control module; Described temperature sensor, humidity sensor amplify relay control unit with the signal of cabinet outside respectively and are electrically connected by electric wire, and the data-signal of being gathered is sent to signal amplification relay control unit; Synchronous signal amplify relay control unit and stream device itself with control module also be electrically connected by electric wire, and make flow device itself with control module according to the data that the detected control that dehumidifies.
6. the control system of an aerogenerator current transformer air dehumidifier, it is characterized in that: the air dehumidifier control device comprises sensor and two controlled devices of four detections in the current transformer, and data acquisition unit, signal amplifies and relay control unit; The sensor of four detections is respectively first temperature sensor, second temperature sensor, three-temperature sensor and humidity sensor, and described two controlled devices are respectively T-valve and well heater; After first temperature sensor is positioned at current transformer, any place of the liquid cooling circulation system before the liquid pump; Second temperature sensor, be positioned at current transformer before, the optional position of the fluid circulation system after the T-valve; Three-temperature sensor and humidity sensor are positioned at any place of cabinet inside; Between data acquisition unit and signal amplification and relay control, a condensation control device is set, the condensation control device is electrically connected with relay control with data acquisition unit and signal amplification respectively, the condensation control device is collected the sensor signal that data acquisition unit is gathered respectively, and sends steering order through compare of analysis and control the control that dehumidifies to signal amplification and relay.
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| CN2010102889002A CN101957624B (en) | 2010-09-21 | 2010-09-21 | Method and system for controlling air dehumidifier of current transformer of wind power generator |
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| CN2010102889002A CN101957624B (en) | 2010-09-21 | 2010-09-21 | Method and system for controlling air dehumidifier of current transformer of wind power generator |
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