CN107517010A - A kind of active dewing-proof method based on change switching frequency - Google Patents
A kind of active dewing-proof method based on change switching frequency Download PDFInfo
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- CN107517010A CN107517010A CN201710672757.9A CN201710672757A CN107517010A CN 107517010 A CN107517010 A CN 107517010A CN 201710672757 A CN201710672757 A CN 201710672757A CN 107517010 A CN107517010 A CN 107517010A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
Abstract
The present invention provides a kind of active dewing-proof method based on change switching frequency, and methods described is directed to totally enclosed type water cooling current transformer, including：According to the air humidity in converter cabinet, temperature conditions, the solidifying dew-point temperature T of air in cabinet is calculateds,ref, and by temperature Ts,refIt is set to the setting value of thermal control closed loop；By above-mentioned setting value compared with radiator temperature, to power device switching frequency on-line control to change switching frequency so that solidifying dew-point temperature T of the temperature of cabinet inner radiator and water circulating pipe higher than air in cabinets,ref, so as to prevent the generation of condensation.The present invention increases the loss of current transformer when current transformer power drop, by changing switching frequency in short-term, and control water-filled radiator avoids the generation of dew condensation phenomenon higher than the dew-point temperature of air in cabinet.This method only needs to modify to the control strategy of current transformer, and without increasing other equipment, and dynamic response is fast, has stepless temperature control capacity.
Description
Technical field
The present invention relates to current transformer control technology field, in particular it relates to a kind of anti-condensation based on the active for becoming switching frequency
Dew method, it is anti-condensation for totally enclosed type water cooling current transformer.
Background technology
At present, wind-powered electricity generation extensive development, covering area include the high humiditys such as sea, beach, high salt fog area.Moist, high salt
The rust that the environment of mist not only easily causes converter system cabinet becomes, aging, reduces structure and dielectric strength, will also have a strong impact on
The working life of electrical equipment and switching device.Therefore offshore wind farm current transformer cabinet body structure need meet to micronic dust, moisture,
The protection requirements of salt fog.At sea in running of wind generating set environment, if current transformer uses air cooling pattern, it will necessarily suck big
Amount carries salt fog, the corrosive atmosphere of moisture, has a negative impact to current transformer device, inner structural members equivalent life, therefore wind
The type of cooling is not to be suitable for offshore wind farm converter system.Converter cabinet needs to design using totally enclosed type, can be effective
Ground and extraneous high salt fog, it is moist be environmentally isolated, but also result in heat in cabinet can not pass through with extraneous air it is cross-ventilated
Mode discharges rack, it is therefore desirable to using totally enclosed type water cooling as system cooling scheme.
Due to the fluctuation and randomness of wind energy, the situation of rapid drawdown may occur for wind speed, now the decline of current transformer power,
This means that loss and resulting heat reduce, and in the case where outside water cooling power is constant, now water cooling dissipates
Hot device and water circulating pipe sharp temperature drop, and air themperature declines slower the problem of radiating efficiency, in cabinet, will so make cabinet
Interior water-filled radiator and water circulating pipe turn into the local cold spot in cabinet.If local cold-point temperature is less than the dew-point temperature in cabinet,
Then there is dew condensation phenomenon on water-filled radiator and water circulating pipe.It is rotten that in electrical equipment metal surface electrification can occur for condensation
Erosion, metal strength and performance are damaged, influences its service life, and electric short circuit may be caused when condensation is serious, if occurring
The possible mating surface dust of condensation on power model surface, forms conductive channel, causes whole between the gate and the drain
Power device disabling damage, and the condensation on controller surface is likely to cause the chaotic situation of short circuit, component failure or signal, this
A little problems all will cause to have a strong impact on to the control of current transformer and operation.
Two kinds of effective ways of condensation are eliminated from condensation genesis mechanism, water cooling current transformer：Humid control method and temperature
Control methods.Humid control method refers to the absolute humidity in reduction air, and the existing anti-condensation technology of humid control mainly passes through increasing
The dehumidifying device such as extra dehumidifier, drier or adsorbed film is added to reduce the absolute humidity in air, these technologies need to increase
Dehydrating unit, cost is added, reduce the reliability of equipment.The temperature that temperature control technology refers to control water-filled radiator is higher than cabinet
The dew-point temperature of interior air, so as to avoid the generation of condensation.The method of existing temperature control technology typically has two kinds, Yi Zhongshi
The outer water cooling plant of start and stop, adds the by-passing valve with control function on water cooling labyrinth, during water-filled radiator temperature step-down, will flow into
The water cooling labyrinth of water-filled radiator bypasses, and cooling water temperature is higher than dew-point temperature, and this mode needs to install band control work(additional
The by-passing valve of energy, this will increase trouble point, while this method can not ensure temperature adjustment precision.Another method is in water
Case heater, by controlling heater to ensure dew-point temperature of the temperature higher than air in cabinet of coolant, but this method
Response speed is slow, it is necessary to configure extra equipment, equally adds cost, adds the trouble point of system operation.
Through retrieval, the A of Publication No. CN 103023277 Chinese patent, a kind of the anti-condensation of water cooling current transformer is disclosed
Control method and device, the invention using increase heater, as the temperature value t of the delivery port of the water tank1It is solidifying less than described
Dew point temperature value t0When to the methods of outside heating water tanks, it is necessary to increase firing equipment, also reduced while cost is added
The reliability of equipment.Method due to using heating devices heat using the water to water tank, but due to the specific heat ratio of water
It is larger, it is very slow to the speed of water heat temperature raising.After the solidifying dew-point temperature that water temperature is less than in cabinet is detected and then water is entered
Row heating, the problem of due to dynamic responding speed, local cold spot has occurred that dew condensation phenomenon in possible cabinet.
The A of Publication No. CN 103616909 Chinese patent, disclose a kind of water cooling current transformer power cabinet control method,
Device and apply its water cooling current transformer.The invention uses start and stop heat-exchange device, and the service life to blower fan is that have an impact, or
Reduce the reliability of plant running.Simultaneously by the way of start and stop, it is impossible to realize stepless smooth temperature adjustment, point of temperature control can not be ensured
Resolution.
The content of the invention
For in the prior art the defects of, it is an object of the invention to provide it is a kind of based on become switching frequency active it is anti-condensation
Method, when current transformer power drop, increase the loss of current transformer by changing switching frequency in short-term, control water-cooling
Device avoids the generation of dew condensation phenomenon higher than the dew-point temperature of air in cabinet.
To achieve the above object, the present invention uses following technical scheme：
It is a kind of that totally enclosed type water cooling current transformer is directed to based on the active dewing-proof method for becoming switching frequency, methods described, wrap
Include：
According to the air humidity in converter cabinet, temperature conditions, the solidifying dew-point temperature T of air in cabinet is calculateds,ref, and
By temperature Ts,refIt is set to the setting value of current transformer thermal control closed loop；
By above-mentioned setting value compared with radiator temperature, frequency is switched to change to power device switching frequency on-line control
Rate so that solidifying dew-point temperature T of the temperature of cabinet inner radiator and water circulating pipe higher than air in cabinets,ref, it is solidifying so as to prevent
The generation of dew.
Preferably, methods described obtains air themperature in cabinet by temperature-humidity sensor in the converter cabinet that fills in advance
T and humidity RH, the solidifying dew-point temperature T of air in cabinet is calculated according to air themperature T in cabinet and humidity RHs,ref, utilize dew point
Temperature Ts,refSetting value as the temperature outer shroud in current transformer thermal control closed loop.
Preferably, methods described gathers all radiator temperatures, chooses wherein minimum value TsWith Ts,refCompare：Work as TsIt is more than
Or equal to Ts,refWhen, dew condensation phenomenon will not occur, temperature control loop is not put into；Work as TsLess than Ts,refWhen, exist and condensation occurs
Risk, by TsWith Ts,refDifference is input to PI controllers, according to PI controllers regulation power device switching frequency, increase switch damage
Consumption, keep TsNot less than Ts,ref, now dew condensation phenomenon will not occur.
Preferably, after power device switching frequency is adjusted for a period of time, switching frequency during normal operating conditions is recovered,
Now TsAll the time it is not less than Ts,ref, then terminate actively anti-condensation control.
Preferably, the saturation vapour pressure calculation formula uses magnus's formula, specific as follows：
Wherein, constant beta=17.62, γ=243.12 DEG C.
The present invention is based on the active release condensation control for becoming switching frequency, simply in TsLess than Ts,refWhen work, act on
Time is short, is influenceed less for the whole efficiency of unit.
The present invention be directed to totally enclosed type water cooling current transformer, using based on the loss control technology for becoming switching frequency, is becoming
When flowing device power drop, by increasing the loss of current transformer by becoming switching frequency in short-term, control water-filled radiator is higher than
The dew-point temperature of air in cabinet, avoids the generation of dew condensation phenomenon.
Compared with prior art, the present invention has following beneficial effect：
1) present invention is realized anti-condensation by the control technology of current transformer in itself, without increasing any servicing unit, is only needed
Change the switching frequency of current transformer device；
2) it is fast based on the loss control technology for becoming switching frequency, dynamic response；
3) continuously adjustabe can be realized, realizes that temperature accurately controls, temperature control precision is high, and special cabinet humidity is very big
When, the temperature difference is smaller, and this method is still adapted to
The technical scheme is simple, it is not necessary to current transformer and unit are transformed, while can be realized well anti-condensation.
Brief description of the drawings
The detailed description made by reading with reference to the following drawings to non-limiting example, further feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 is existing current transformer multiple-unit parallel system structural representation；
Fig. 2 is Foster thermal impedance network model figures；
Fig. 3 is one embodiment of the invention based on the anti-condensation control block diagram for becoming switching frequency；
Fig. 4 is air themperature, humidity, dew-point temperature graph of a relation in one embodiment of the invention cabinet；
Fig. 5 is one embodiment of the invention wind speed situation of change；
Fig. 6 a are temperature conditions figure before the anti-condensation control of one embodiment of the invention；
Fig. 6 b are temperature conditions figure after the anti-condensation control of one embodiment of the invention.
Embodiment
With reference to specific embodiment, the present invention is described in detail.Following examples will be helpful to the technology of this area
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill to this area
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection domain.
For totally enclosed type water cooling current transformer, the present invention proposes a kind of loss Evolution of Thermal Control Technique based on change switching frequency,
And realize that the active of current transformer is anti-condensation by the way that Evolution of Thermal Control Technique is lost, this method only needs to repair the control strategy of current transformer
Change, without increasing other equipment, and dynamic response is fast, has stepless temperature control capacity.
Current transformer thermal control is to change the thermal environment of power device by the loss control to power model.Power device
IGBT and DIODE loss is made up of conduction loss and switching loss.IGBT and DIODE switching losses and switching frequency fSWPhase
Close, therefore by adjusting switching frequency current transformer can be controlled to be lost.Can be with from the Foster thermal impedances models of Fig. 2 power devices
Find out, when IGBT thermal impedance is constant, by controlling current transformer that P is lostIGBT, IGBT junction temperatures T can be adjustedjAnd radiating
Device temperature TH, then it is achieved that the thermal control of current transformer.
Current transformer thermal control closed loop refers to adjust current transformer by the closed-loop control of current transformer loss and radiating condition etc.
Warm status, so as to improve the healthy operation level of current transformer.
Setting for thermal control closed loop is calculated based on referring to according to the air humidity in converter cabinet, temperature conditions in the present invention
Definite value, by the on-line control to switching frequency so as to realizing condensation point of the temperature of water-filled radiator in cabinet higher than air in cabinet
Temperature, so as to prevent the generation of condensation.
It is as shown in figure 3, as follows based on the anti-condensation control block diagram for becoming switching frequency, method specific implementation step：
Step 1：In-cabinet temperature T and humidity RH is obtained by the in-cabinet temperature, the humidity sensor that are pre-loaded with, according to unsteady flow
Air themperature obtains the solidifying dew-point temperature T of air in cabinet by saturation vapour pressure calculation formula in humidity, cabinet in device cabinets,ref。
Utilize dew-point temperature Ts,refAs the setting based on the temperature outer shroud in the current transformer thermal control block diagram for becoming switching frequency shown in Fig. 3
Definite value；
The saturation vapour pressure calculation formula uses magnus's formula, specific as follows：
Wherein, constant beta=17.62, γ=243.12 DEG C.
In specific implementation, calculated by above-mentioned formula, air themperature, humidity, dew in cabinet as shown in Figure 4 can be obtained
Point temperature relation figure, is only certainly, in the figure partial data relation, according to above-mentioned formula, can calculate required various situations
Under cabinet in air themperature, humidity, dew-point temperature relation.
Step 2：All radiator temperatures are gathered, choose wherein minimum value TsWith Ts,refCompare：Work as TsIt is more than or equal to
Ts,refWhen, dew condensation phenomenon will not occur, temperature control loop is not put into；Work as TsLess than Ts,refWhen, the risk that condensation occurs be present, will
TsWith Ts,refDifference is input to PI controllers, according to PI controllers regulation power device switching frequency, increases switching loss, keeps
TsNot less than Ts,ref, now dew condensation phenomenon will not occur.
Step 3：After a certain time, the switching frequency of initial optimization design is driven, now TsAll the time it is not less than Ts,ref, that
Terminate actively anti-condensation control.Therefore controlled simply in T based on the active release condensation for becoming switching frequencysLess than Ts,refWhen from
Effect, action time is short, is influenceed less for the whole efficiency of unit.
Below in conjunction with the accompanying drawings and the present invention program is described in further detail specific embodiment.
Implementation example 1：
As shown in figure 1, exemplified by using 3MW full-power wind power converters (a kind of totally enclosed type water cooling current transformer), shown in Fig. 1
It is a kind of current transformer multiple-unit parallel system structure, interface line voltage is 690V/50Hz, and DC bus capacitance group is
38.8mF, DC bus-bar voltage set-point are 1100V, switching frequency 3kHz, and LCL filter parameter is：Current transformer side inductance
Be 668.4 μ F for 100 μ H, median filter electric capacity, power network equivalent inductance be 170 μ H, power model is using Semikron companies
SKiiP 1814GB17E4-3DUW。
According to the parameter of above-mentioned full power convertor, the Matlab/Simulink 3MW squirrel-cage generating sets of foundation are imitated
On true platform.In order to embody the effect of circulation control, the wind speed curve employed in emulation is simplified phase step type wind speed
Model, as shown in figure 5, being divided into three phases：
(1) first stage：[0,1s] section wind speed is 6m/s.
(2) second stage：[1s, 3.5s] section wind speed increases to 10m/s, and now wind electric converter watt current becomes big,
Junction temperature rises, and from the point of view of Fig. 4, now switching frequency is constant.
(3) phase III：[3.5s, 5.5s] section wind speed is reduced to 8m/s from 10m/s, and the temperature according to Fig. 3 judges accurate
Then (i.e. described in above-mentioned steps 2), switching frequency improves.
(4) fourth stage：[5.5s, 8s] section wind speed is increased again to 10m/s from 8m/s, and the temperature according to Fig. 3 judges
Criterion, switching frequency reduce.
In order to verify anti-condensation control technology, based on PLECS and Matlab/Simulink 3MW total powers Wind turbines electricity
Hot emulation platform carries out simulation analysis.Simulation result is as shown in Fig. 6 a, 6b.It is assumed that water-filled radiator temperature and cabinet in normal operation
Interior air themperature is close, when wind speed declines suddenly, current transformer power and loss decline, water-filled radiator temperature will quickly under
Drop, air is limited due to radiating condition in cabinet, and its temperature slowly declines, as shown in Figure 6 a.Now water-filled radiator temperature compares cabinet
Interior control temperature is low nearly 10 DEG C, and as can be seen from Figure 5, when air humidity is Φ=80% in cabinet, now water-filled radiator will occur
Dew condensation phenomenon.And humidity Φ=80% is equipped within humidity allowed band in wind electric converter, this operating mode is in actual motion
It is likely to occur, then if without anti-condensation control, condensation is will appear from water-filled radiator, to the reliable fortune of current transformer
Row has adverse effect on.
Using the present invention based on the anti-condensation control technology of active for becoming switching frequency, pass through temperature control after the reduction of wind power
Ring processed, increase switching frequency, increase current transformer device loss, then by detecting water-filled radiator temperature and according to air in cabinet
The condensation point that temperature, humidity are calculated relatively obtains switching frequency, ensures that water-filled radiator temperature is empty not less than in cabinet all the time
The solidifying dew-point temperature of gas, until air themperature reaches stationary value in control water-filled radiator and cabinet, now water-filled radiator temperature
Dew-point temperature necessarily is coagulated higher than air in cabinet, exits the anti-condensation control of active for becoming switching frequency, switching frequency returns to design
Optimal value, current transformer is again at efficient working condition.As shown in Figure 6 b, now radiator temperature is empty not less than in cabinet
The solidifying dew-point temperature of gas, then as can be seen from Figure 4, when air humidity is Φ=80% in cabinet, will not occur on water-filled radiator
Dew condensation phenomenon.It can thus be appreciated that by based on the anti-condensation control technology of active for becoming switching frequency, avoiding dew condensation phenomenon, improving
The reliability of current transformer.
Therefore, above-mentioned control method：Realized by the control technology of current transformer in itself anti-condensation, it is not necessary to increase any
Auxiliary equipment；Continuously adjustabe can be realized, realizes that temperature accurately controls, based on temperature controlled anti-when realizing high humility in cabinet
Condensation technology；Fast response time.
The specific embodiment of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substantive content of the present invention.
Claims (6)
- It is 1. a kind of based on the active dewing-proof method for becoming switching frequency, it is characterised in that methods described is directed to totally enclosed type water cooling Current transformer, including：According to the air humidity in converter cabinet, temperature conditions, the solidifying dew-point temperature T of air in cabinet is calculateds,ref, and should Temperature Ts,refIt is set to the setting value of current transformer thermal control closed loop；By above-mentioned setting value compared with radiator temperature, to power device switching frequency on-line control to change switching frequency, make Cabinet inner radiator and water circulating pipe temperature higher than air in cabinet solidifying dew-point temperature Ts,ref, so as to prevent the hair of condensation It is raw.
- It is 2. according to claim 1 based on the active dewing-proof method for becoming switching frequency, it is characterised in that methods described is led to After temperature-humidity sensor in the converter cabinet filled in advance, air themperature T and humidity RH in cabinet is obtained, according to Air Temperature in cabinet The solidifying dew-point temperature T of air in cabinet is calculated in degree T and humidity RHs,ref, utilize dew-point temperature Ts,refAs current transformer thermal control The setting value of temperature outer shroud in closed loop.
- It is 3. according to claim 2 based on the active dewing-proof method for becoming switching frequency, it is characterised in that methods described is adopted Collect all radiator temperatures, choose wherein minimum value TsWith Ts,refCompare：Work as TsMore than or equal to Ts,refWhen, dew condensation phenomenon will not occur, temperature control loop is not put into；Work as TsLess than Ts,refWhen, the risk that condensation occurs be present, by TsWith Ts,refDifference is input to PI controllers, is controlled according to PI Device adjusts power device switching frequency, increases switching loss, keeps TsNot less than Ts,ref, now dew condensation phenomenon will not occur.
- It is 4. according to claim 3 based on the active dewing-proof method for becoming switching frequency, it is characterised in that in regulation power Devices switch frequency for a period of time after, recover switching frequency during normal operating conditions, now TsAll the time it is not less than Ts,ref, then Terminate actively anti-condensation control.
- 5. the active dewing-proof method based on change switching frequency according to claim any one of 1-4, it is characterised in that institute State the solidifying dew-point temperature T of air in cabinets,refIt is calculated using below equation：<mrow> <mtable> <mtr> <mtd> <mrow> <mi>D</mi> <mi>p</mi> <mrow> <mo>(</mo> <mi>T</mi> <mo>,</mo> <mi>R</mi> <mi>H</mi> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>=</mo> <mfrac> <mrow> <mi>&lambda;</mi> <mo>&CenterDot;</mo> <mrow> <mo>(</mo> <mi>ln</mi> <mo>(</mo> <mfrac> <mrow> <mi>R</mi> <mi>H</mi> </mrow> <mn>100</mn> </mfrac> <mo>)</mo> <mo>+</mo> <mfrac> <mrow> <mi>&beta;</mi> <mo>&CenterDot;</mo> <mi>T</mi> </mrow> <mrow> <mi>&lambda;</mi> <mo>+</mo> <mi>T</mi> </mrow> </mfrac> <mo>)</mo> </mrow> </mrow> <mrow> <mi>&beta;</mi> <mo>-</mo> <mrow> <mo>(</mo> <mi>ln</mi> <mo>(</mo> <mfrac> <mrow> <mi>R</mi> <mi>H</mi> </mrow> <mn>100</mn> </mfrac> <mo>)</mo> <mo>+</mo> <mfrac> <mrow> <mi>&beta;</mi> <mo>&CenterDot;</mo> <mi>T</mi> </mrow> <mrow> <mi>&lambda;</mi> <mo>+</mo> <mi>T</mi> </mrow> </mfrac> <mo>)</mo> </mrow> </mrow> </mfrac> </mrow> </mtd> </mtr> </mtable> <mo>,</mo> </mrow>Wherein, constant beta=17.62, γ=243.12 DEG C.
- 6. the active dewing-proof method based on change switching frequency according to claim any one of 1-4, it is characterised in that institute Method is stated only in TsLess than Ts,refWhen work, action time is short, for unit whole efficiency influence it is little.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114128115A (en) * | 2020-06-30 | 2022-03-01 | 华为数字能源技术有限公司 | Inverter, inversion system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114128115A (en) * | 2020-06-30 | 2022-03-01 | 华为数字能源技术有限公司 | Inverter, inversion system and method |
| EP4156483A4 (en) * | 2020-06-30 | 2023-07-05 | Huawei Digital Power Technologies Co., Ltd. | Inverter, and inversion system and method |
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Application publication date: 20171226 |
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