CN111587041A - Heat dissipation device of photovoltaic inverter and control method - Google Patents
Heat dissipation device of photovoltaic inverter and control method Download PDFInfo
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- 230000017525 heat dissipation Effects 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000001816 cooling Methods 0.000 claims abstract description 17
- 238000001914 filtration Methods 0.000 claims description 3
- 238000010248 power generation Methods 0.000 abstract description 10
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000013021 overheating Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000013480 data collection Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20909—Forced ventilation, e.g. on heat dissipaters coupled to components
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/40—Thermal components
- H02S40/42—Cooling means
- H02S40/425—Cooling means using a gaseous or a liquid coolant, e.g. air flow ventilation, water circulation
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20209—Thermal management, e.g. fan control
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20945—Thermal management, e.g. inverter temperature control
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The invention discloses a heat dissipation device and a control method of a photovoltaic inverter, wherein the heat dissipation device comprises a heat dissipation bin casing, a control unit, a fan set, a radiator and a temperature acquisition unit, wherein the control unit is electrically connected with the fan set, the radiator and the temperature acquisition unit in a one-to-one correspondence manner; the radiator and the fan set are positioned on the radiating bin shell, the temperature acquisition unit and the fan set are arranged at any positions close to the radiator, and the radiator is arranged adjacent to a power device of the photovoltaic inverter; wherein, be provided with two at least fans in the fan group. The temperature acquisition unit is used for acquiring the temperature of the radiator, so that the loss of the fan is reduced, and the service life of the fan is prolonged; and a plurality of fans are arranged for air cooling and heat dissipation, so that when one fan fails, other fans can perform air cooling and heat dissipation, the output power of the photovoltaic inverter does not need to be directly reduced, and the power generation efficiency and reliability of the photovoltaic inverter are improved.
Description
Technical Field
The invention relates to the technical field of circuit protection, in particular to a heat dissipation device of a photovoltaic inverter and a control method.
Background
With the further improvement of the power of the group-string photovoltaic inverter, the natural heat dissipation is difficult to meet the requirement, and the photovoltaic inverter with the power more than 50kW is suitable for forced air cooling heat dissipation;
the existing inverter air-cooled heat dissipation system is simple to control and has larger fan power consumption; the fan works in an outdoor harsh environment, the failure rate of the fan is high, the inverter is stopped when reporting a failure, or the power is reduced to operate, and the power generation efficiency of the photovoltaic power station is influenced.
A typical fan control mode is to collect the power of the inverter and the temperature signal of the radiator through a controller, and when the power of the inverter reaches a certain value (for example, 30% load), the fan is turned on; or still further, according to the power of the inverter, setting the fan rotating speed of several different gears, such as reaching 25% of load, starting 1 wind shield, reaching 40% of load, starting 2 wind shield, reaching 60% of load, and starting 3 wind shield. When the temperature of the radiator collected by the controller reaches an over-temperature value, the output is gradually derated until the temperature is reduced to a safe range.
However, the above control method has the following problems: (1) the inverter is in a lower working environment temperature for most of time, for example, the inverter is in a low-temperature environment and a low-medium power running state for most of time in winter, and a fan is not required to be started; during other seasons, the inverter is also at a lower ambient temperature (e.g., less than 25℃.) and the fan does not need to run at full power. In the prior art, the power of the inverter is used as the starting condition, so that the fan is started in a low-temperature environment and even in a high-rotating-speed state, the energy consumption is high, and the service life of the fan can be shortened. (2) The fan working environment of the inverter is poor, the failure rate is high, and in the prior art, when the fan fails, the output power of the inverter is directly reduced, so that the power generation efficiency of a power station is influenced.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: a heat dissipation device and a control method of a photovoltaic inverter are provided to improve the power generation efficiency of the photovoltaic inverter.
In order to solve the technical problems, the invention adopts the technical scheme that:
the heat dissipation device of the photovoltaic inverter comprises a heat dissipation bin casing, a control unit, a fan set, a radiator and a temperature acquisition unit, wherein the control unit is electrically connected with the fan set, the radiator and the temperature acquisition unit in a one-to-one corresponding mode;
the radiator and the fan set are positioned on the radiating bin shell, the temperature acquisition unit and the fan set are arranged at any positions close to the radiator, and the radiator is arranged adjacent to a power device of the photovoltaic inverter;
at least two fans are arranged in the fan set.
In order to solve the technical problem, the invention adopts another technical scheme as follows:
the heat dissipation control method of the photovoltaic inverter comprises the following steps:
s1, receiving the real-time temperature value of the radiator collected by the temperature collecting unit;
s2, judging whether all fans of a fan set have faults or not, if not, entering a temperature control mode, otherwise, judging whether the fans with the faults in the fan set are larger than 1 or not, if so, reducing the maximum output power of the photovoltaic inverter and then entering the temperature control mode, otherwise, directly entering the temperature control mode, wherein the temperature control mode is that the running state of the fan set is controlled according to the real-time temperature value of the radiator;
and S3, controlling the fan group to perform air cooling heat dissipation on the radiator and the power device of the photovoltaic inverter.
The invention has the beneficial effects that: the heat dissipation device of the photovoltaic inverter and the control method thereof have the advantages that the temperature of the heat dissipater is collected through the temperature collection unit, so that the running time of the fan is greatly reduced, the loss of the fan is reduced, and the service life of the fan is prolonged; and a plurality of fans are arranged for air cooling and heat dissipation, so that when one fan fails, other fans can perform air cooling and heat dissipation, the output power of the photovoltaic inverter does not need to be directly reduced, and the power generation efficiency and reliability of the photovoltaic inverter are improved.
Drawings
Fig. 1 is a perspective view of a heat dissipation device of a photovoltaic inverter according to an embodiment of the present invention;
fig. 2 is a partially disassembled schematic view of a heat dissipation device of a photovoltaic inverter according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a heat dissipation control method of a photovoltaic inverter according to an embodiment of the present invention;
fig. 4 is a schematic block diagram of a method for controlling heat dissipation of a photovoltaic inverter according to an embodiment of the present invention;
fig. 5 is a schematic flow chart illustrating a heat dissipation control method of a photovoltaic inverter according to an embodiment of the present invention;
fig. 6 is a schematic flow chart of a temperature control mode according to an embodiment of the present invention.
Description of reference numerals:
1. a heat dissipation bin housing; 2. a fan set; 3. a heat sink; 4. the temperature acquisition unit, 5 and the control unit; 11. heat dissipation holes; 21. a fan; 100. a maximum power device; 101. a boost inductor; 102. and a filter inductor.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1 to 2, the heat dissipation device of the photovoltaic inverter includes a heat dissipation bin casing, a control unit, a fan set, a heat sink and a temperature acquisition unit, wherein the control unit is electrically connected to the fan set, the heat sink and the temperature acquisition unit in a one-to-one correspondence manner;
the radiator and the fan set are positioned on the radiating bin shell, the temperature acquisition unit and the fan set are arranged at any positions close to the radiator, and the radiator is arranged adjacent to a power device of the photovoltaic inverter;
at least two fans are arranged in the fan set.
From the above description, the beneficial effects of the present invention are: the temperature acquisition unit is used for acquiring the temperature of the radiator, so that the running time of the fan is greatly reduced, the loss of the fan is reduced, and the service life of the fan is prolonged; and a plurality of fans are arranged for air cooling and heat dissipation, so that when one fan fails, other fans can perform air cooling and heat dissipation, the output power of the photovoltaic inverter does not need to be directly reduced, and the power generation efficiency and reliability of the photovoltaic inverter are improved.
Furthermore, the temperature acquisition units are arranged on the bottom surface of the radiator in a plurality, wherein one temperature acquisition unit is close to the maximum power device of the photovoltaic inverter.
From the above description, it can be known that the radiator is subjected to multipoint acquisition by arranging a plurality of temperature acquisition units, so that the local hotter temperature of the radiator can be acquired under different working conditions, and the inverter is prevented from being damaged due to local overheating when a single fan or a plurality of fans are in failure.
Furthermore, the fan set is located on one side of the radiator, an air opening of the fan set faces the radiator, and the other sides of the radiator are used for placing a boosting inductor and a filtering inductor of the photovoltaic inverter.
As can be seen from the above description, after the fan set is turned on, the heat sink, the boost inductor, and the filter inductor are all cooled by air.
Further, the temperature acquisition unit is an NTC thermosensitive element.
From the foregoing description, it can be seen that a preferred embodiment of a temperature acquisition unit is provided.
Furthermore, a plurality of uniformly distributed heat dissipation holes are formed in the side edge of the heat dissipation bin casing.
As can be seen from the above description, heat is dissipated by ventilation from the outside through the heat dissipation holes.
Referring to fig. 3 to 6, the method for controlling heat dissipation of a photovoltaic inverter includes the following steps:
s1, receiving the real-time temperature value of the radiator collected by the temperature collecting unit;
s2, judging whether all fans of a fan set have faults or not, if not, entering a temperature control mode, otherwise, judging whether the fans with the faults in the fan set are larger than 1 or not, if so, reducing the maximum output power of the photovoltaic inverter and then entering the temperature control mode, otherwise, directly entering the temperature control mode, wherein the temperature control mode is that the running state of the fan set is controlled according to the real-time temperature value of the radiator;
and S3, controlling the fan group to perform air cooling heat dissipation on the radiator and the power device of the photovoltaic inverter.
From the above description, the beneficial effects of the present invention are: the temperature acquisition unit is used for acquiring the temperature of the radiator, and the plurality of fans are arranged for air cooling and heat dissipation, so that when one fan fails, because other fans can perform air cooling and heat dissipation, the output power of the photovoltaic inverter does not need to be directly reduced, and the power generation efficiency and the reliability of the photovoltaic inverter are improved; meanwhile, the running state of the fan set is controlled according to the real-time temperature value of the radiator, so that the phenomenon that the fan is started in a low-temperature environment or is in a high-rotating-speed state in the low-temperature environment is avoided, and the heat dissipation control method which is high in power generation efficiency, more energy-saving in control mode and capable of prolonging the service life of the fan is provided.
Further, the step S1 specifically includes the following steps:
the method comprises the steps of receiving an environment real-time temperature value, a radiator real-time temperature value respectively collected by a plurality of temperature collection units arranged at different positions of a radiator, and a power device real-time temperature value respectively collected by a temperature collection unit arranged in each power device.
From the above description, it can be known that the radiators are subjected to multipoint collection by arranging a plurality of temperature collection units, and meanwhile, the temperature collection unit arranged in each power device carries out temperature collection on each power device, so that multipoint collection of the power devices is realized, and the inverter is prevented from being damaged due to local overheating when a single fan or a plurality of fans break down.
Further, the temperature control mode of step S2 specifically includes the following steps:
s21, judging whether the real-time temperature value of the radiator is higher than a first radiator temperature threshold value, if so, executing a step S22, otherwise, executing a step S23;
s22, judging whether the real-time temperature value of the radiator is higher than or equal to a second radiator temperature threshold value or whether the real-time temperature value of the power device is higher than or equal to a first power device temperature threshold value or whether the real-time temperature value of the environment is higher than or equal to a first environment temperature threshold value, if so, reducing the maximum output power of the photovoltaic inverter, and then executing a step S24, otherwise, controlling the up-down gear of the fan set according to the real-time temperature value of the radiator, wherein the second radiator temperature threshold value is larger than the first radiator temperature threshold value;
s23, judging whether the real-time temperature value of the radiator is higher than a fourth radiator temperature threshold value, if so, maintaining the rotating speed of the fan set at the current gear, otherwise, closing the fan set, and enabling the first radiator temperature threshold value to be larger than the fourth radiator temperature threshold value;
s24, judging whether the real-time temperature value of the radiator is higher than or equal to a third radiator temperature threshold value or whether the real-time temperature value of the power device is higher than or equal to a second power device temperature threshold value or whether the real-time temperature value of the environment is higher than or equal to a second environment temperature threshold value, if so, controlling the photovoltaic inverter to shut down, reporting an over-temperature fault, and returning to a standby state, wherein the third radiator temperature threshold value is larger than the second radiator temperature threshold value, the second power device temperature threshold value is larger than the first power device temperature threshold value, and the second environment temperature threshold value is larger than the first environment temperature threshold value.
As can be seen from the above description, by setting two-gear over-temperature protection, when one of the real-time temperatures reaches the first-gear temperature limit value, the output of the inverter starts derating, and if the real-time temperature reaches the second-gear temperature limit value, the inverter is directly shut down to cover the temperature limit protection under different working conditions; meanwhile, when a fan fails, if the inverter is in a medium-low temperature environment, full-load operation of the inverter is guaranteed; only under the limit working condition, derating operation occurs, the loss of the generated energy is reduced to the minimum, and sufficient time is reserved for maintaining the inverter, so that the generating efficiency and the use safety of the inverter are ensured simultaneously.
Further, the step S22 of controlling the shift stage of the fan set according to the real-time temperature value of the heat sink specifically includes the following steps:
after the real-time temperature value of the radiator reaches a first radiator temperature threshold value for the first time, the lowest gear of the fan is started, and then the real-time temperature value of the radiator is controlled to be shifted by one when the real-time temperature value of the radiator rises by one preset gear threshold value to increase the rotating speed of the fan until the gear of the fan rises to the maximum, and the real-time temperature value of the radiator is controlled to be shifted by one when the real-time temperature value of the radiator falls by one preset gear threshold value to reduce the rotating speed of the fan until the gear of the fan falls to the minimum.
As can be seen from the above description, a more accurate heat dissipation control is realized on the premise that frequent control is not required by presetting a gear threshold and a corresponding multi-gear fan rotation speed.
Further, the following steps are also included between the step S1 and the step S2:
and judging whether the temperature difference among the radiator real-time temperature value, the power device real-time temperature value and the environment real-time temperature value and the corresponding absolute values are all within a preset normal range, if so, executing a step S2, otherwise, reducing the maximum output power of the photovoltaic inverter and then entering a power control mode, wherein the power control mode is to control the running state of the fan set according to the real-time output power of the photovoltaic inverter.
From the above description, it can be known that the temperature self-checking function is set, and under the condition that the temperature acquisition data is abnormal, the output power debugging mode is used to ensure that the heat dissipation control can be carried out under any working condition.
Referring to fig. 1 to fig. 2, a first embodiment of the present invention is:
the heat dissipation device of the photovoltaic inverter comprises a heat dissipation bin casing 1, a control unit, a fan set 2, a radiator 3 and a temperature acquisition unit 4, wherein the control unit is electrically connected with the fan set 2, the radiator 3 and the temperature acquisition unit 4 in a one-to-one correspondence manner; the radiator 3 and the fan set 2 are located on the radiating bin casing 1, the temperature acquisition unit 4 and the fan set 2 are both arranged at any position close to the radiator 3, and the radiator 3 is arranged close to a power device of the photovoltaic inverter.
In the present embodiment, at least two fans 21 are disposed in the fan set 2, and as shown in fig. 1 and 2, 4 fans 21 are disposed, so that when one fan 21 fails, because other fans 21 can perform air cooling heat dissipation, it is not necessary to directly reduce the output power of the photovoltaic inverter, thereby improving the power generation efficiency of the photovoltaic inverter.
In this embodiment, as can be seen from fig. 1, the heat sink 3 is connected to one side of the heat sink housing 1, and the fan set 2, the boost inductor 101 of the photovoltaic inverter, and the filter inductor 102 are respectively disposed on the other three sides of the heat sink 3. Wherein, filter inductance 102 is the filtering effect of contravariant side, and boost inductance 101 is the direct current boost inductance 101 of photovoltaic side, and the wind gap of fan group 2 is towards radiator 3, and the side of heat dissipation storehouse casing 1 is provided with a plurality of evenly distributed's louvre 11 for fan group 2 opens the back, all carries out the forced air cooling heat dissipation to radiator 3, boost inductance 101 and filter inductance 102.
In this embodiment, as can be seen from fig. 2, a plurality of temperature collection units 4 are disposed on the bottom surface of the heat sink 3, one of the temperature collection units 4 is close to the maximum power device 100 of the photovoltaic inverter, meanwhile, the temperature collection unit 4 is an NTC thermistor, and meanwhile, the power device of the photovoltaic inverter itself is internally provided with an NTC thermistor, and can be connected with the control unit through the routing of the PCB board, so that the control unit can receive the real-time temperature of the power device, that is, multi-point collection of the heat sink 3 and multi-point collection of the power device are achieved, and damage to the inverter due to local overheating when a single fan 21 or a plurality of fans 21 fail is avoided.
The following embodiments are provided for a control method implemented by the heat dissipation device of the photovoltaic inverter of the present embodiment.
Referring to fig. 3 to fig. 6, a second embodiment of the present invention is:
the heat dissipation control method of the photovoltaic inverter is controlled by the control unit 5 in the first embodiment, and includes the following steps:
s1, receiving the real-time temperature value of the radiator collected by the temperature collecting unit;
in this embodiment, as shown in fig. 4, step S1 specifically includes the following steps: the method comprises the steps of receiving an environment real-time temperature value, a radiator real-time temperature value respectively collected by a plurality of temperature collection units arranged at different positions of a radiator and a power device real-time temperature value respectively collected by a temperature collection unit arranged in each power device, namely realizing multipoint collection of the radiator and multipoint collection of the power device, and avoiding damage to an inverter caused by local overheating when a single fan or a plurality of fans break down.
As shown in fig. 5, the following steps are further included between step S1 and step S2:
and judging whether the temperature difference among the real-time temperature value of the radiator, the real-time temperature value of the power device and the real-time temperature value of the environment and the corresponding absolute values are all in a preset normal range, if so, executing the step S2, otherwise, reducing the maximum output power of the photovoltaic inverter and then entering a power control mode, wherein the power control mode is to control the running state of the fan set 2 according to the real-time output power of the photovoltaic inverter. The temperature self-checking function is set, and an output power debugging mode is used under the condition that temperature acquisition data is abnormal, so that heat dissipation control can be carried out under any working condition.
S2, judging whether all fans of the fan set 2 have faults or not, if not, entering a temperature control mode, otherwise, judging whether the fans with the faults in the fan set 2 are larger than 1 or not, if so, entering the temperature control mode after reducing the maximum output power of the photovoltaic inverter, otherwise, directly entering the temperature control mode, wherein the temperature control mode is to control the running state of the fan set 2 according to the real-time temperature value of the radiator, therefore, when one fan has the faults, the output power of the photovoltaic inverter does not need to be directly reduced, so that the power generation efficiency of the photovoltaic inverter is improved;
as shown in fig. 6, the temperature control mode of step S2 specifically includes the following steps:
s21, determining whether the real-time temperature value of the heat sink is higher than a first heat sink temperature threshold, if so, performing step S22, otherwise, performing step S23, wherein in the present embodiment, as shown in fig. 6, it is assumed that the first heat sink temperature threshold is 50 ℃;
s22, determining whether the real-time temperature value of the heat sink is greater than or equal to a second heat sink temperature threshold or whether the real-time temperature value of the power device is greater than or equal to a first power device temperature threshold or whether the real-time temperature value of the power device is greater than or equal to a first environment temperature threshold, if so, reducing the maximum output power of the photovoltaic inverter, then executing step S24, otherwise, controlling the up-down gear of the fan set 2 according to the real-time temperature value of the heat sink, where the second heat sink temperature threshold is greater than the first heat sink temperature threshold, in this embodiment, as shown in fig. 6, the second heat sink temperature threshold is 80 ℃, the first power device temperature threshold is 95 ℃, and the first environment temperature threshold is 80 ℃, so as to provide the first-gear over-temperature protection;
wherein, the step S22 of controlling the elevating gear of the fan set 2 according to the real-time temperature value of the heat sink specifically includes the following steps:
after the real-time temperature value of the radiator reaches 50 ℃ for the first time, the lowest gear of the fan is started, and then, every time the real-time temperature value of the radiator rises by a preset gear threshold value, the fan set 2 is controlled to be shifted up to increase the rotating speed of the fan until the fan reaches the highest gear, and every time the real-time temperature value of the radiator drops by a preset gear threshold value, the fan set 2 is controlled to be shifted down to reduce the rotating speed of the fan until the lowest gear of the fan, wherein in the embodiment, as shown in fig. 6, the preset gear threshold value is 5 ℃, namely the rotating speed of the fan is gradually increased along with the rise of the temperature of the radiator, otherwise, the rotating speed is reduced, so that on the premise of not needing frequent;
that is, in the present embodiment, when a fan failure occurs, if in a medium-low temperature environment, full-load operation of the inverter is guaranteed; only under the limit working condition, derating operation occurs, the loss of the generated energy is reduced to the minimum, and sufficient time is reserved for maintaining the inverter, so that the generating efficiency and the use safety of the inverter are ensured simultaneously.
S23, determining whether the real-time temperature value of the radiator is higher than a fourth radiator temperature threshold, if so, maintaining the rotation speed of the fan set 2 in the current gear, otherwise, closing the fan set 2, and the first radiator temperature threshold is higher than the fourth radiator temperature threshold, wherein, in this embodiment, as shown in fig. 6, the fourth radiator temperature threshold is 35 ℃, so that, if the temperature of the radiator is returned from above 50 ℃ to between 35 ℃ and 50 ℃, only the current gear, i.e., the lowest gear, needs to be maintained, and the fan is directly closed below 35 ℃, and if the temperature of the radiator does not exceed 50 ℃ after the inverter is turned on, the fan is still not turned on between 35 ℃ and 50 ℃, thereby avoiding the phenomenon that the fan is turned on in a low-temperature environment or the fan is in a high-rotation-speed state in a low-temperature environment;
s24, determining whether the real-time temperature value of the heat sink is greater than or equal to a third heat sink temperature threshold or whether the real-time temperature value of the power device is greater than or equal to a second power device temperature threshold or whether the real-time temperature value of the power device is greater than or equal to a second environment temperature threshold, if so, controlling the photovoltaic inverter to shut down, reporting an over-temperature fault, and returning to a standby state, where the third heat sink temperature threshold is greater than the second heat sink temperature threshold, the second power device temperature threshold is greater than the first power device temperature threshold, and the second environment temperature threshold is greater than the first environment temperature threshold, where in this embodiment, as shown in fig. 6, the second heat sink temperature threshold is 85 ℃, the first power device temperature threshold is 100 ℃, and the first environment temperature threshold is 85 ℃, so as to provide second over-temperature protection.
S3, controlling the fan set 2 to perform air-cooling heat dissipation on the power devices of the heat sink and the photovoltaic inverter, that is, controlling the operation of the fan set 2 according to the control command, thereby performing air-cooling heat dissipation on the power devices of the heat sink and the photovoltaic inverter.
In summary, the heat dissipation device and the control method for the photovoltaic inverter provided by the invention avoid damage to the inverter due to local overheating when a single fan or a plurality of fans fail by performing multipoint acquisition on the heat sink and multipoint acquisition on the power device; the air cooling and heat dissipation are carried out by arranging the plurality of fans, so that when one fan fails, if the inverter is in a medium-low temperature environment, the full-load operation of the inverter is guaranteed; only under the limit working condition, derating operation occurs, the loss of the generated energy is reduced to the minimum, and sufficient time is left for maintaining the inverter, so that the generating efficiency and the use safety of the inverter are ensured; meanwhile, the running state of the fan set is controlled according to the real-time temperature value of the radiator so as to avoid the phenomenon that the fan is started in a low-temperature environment or is in a high-rotating-speed state in the low-temperature environment, and the temperature limiting protection under different working conditions is covered by setting two-gear over-temperature protection; through predetermineeing fender position threshold value and the many fender fan rotational speeds that correspond to under the prerequisite that does not need frequent control, realize more accurate heat dissipation control, through setting up temperature self-checking function, under the unusual condition of temperature data collection, use output debugging mode, in order to guarantee can both carry out heat dissipation control under any operating mode, thereby provide one kind generating efficiency height, the safe degree of use height, the control mode is more accurate energy-conserving, the operating mode scope of use is more extensive and can promote the heat dissipation control method of fan life-span.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (10)
1. Photovoltaic inverter's heat abstractor, its characterized in that: the device comprises a heat dissipation bin casing, a control unit, a fan set, a radiator and a temperature acquisition unit, wherein the control unit is electrically connected with the fan set, the radiator and the temperature acquisition unit in a one-to-one corresponding manner;
the radiator and the fan set are positioned on the radiating bin shell, the temperature acquisition unit and the fan set are arranged at any positions close to the radiator, and the radiator is arranged adjacent to a power device of the photovoltaic inverter;
at least two fans are arranged in the fan set.
2. The heat sink for a photovoltaic inverter according to claim 1, wherein: the temperature acquisition units are arranged on the bottom surface of the radiator in a plurality, and one of the temperature acquisition units is close to the maximum power device of the photovoltaic inverter.
3. The heat sink for a photovoltaic inverter according to claim 1, wherein: the fan set is located on one side of the radiator, an air opening of the fan set faces the radiator, and the other sides of the radiator are used for placing a boosting inductor and a filtering inductor of the photovoltaic inverter.
4. The heat sink for a photovoltaic inverter according to claim 1, wherein: the temperature acquisition unit is an NTC thermosensitive element.
5. The heat dissipating device for a photovoltaic inverter according to any one of claims 1 to 4, wherein: the side of the heat dissipation bin casing is provided with a plurality of heat dissipation holes which are uniformly distributed.
6. The heat dissipation control method of the photovoltaic inverter is characterized by comprising the following steps of:
s1, receiving the real-time temperature value of the radiator collected by the temperature collecting unit;
s2, judging whether all fans of a fan set have faults or not, if not, entering a temperature control mode, otherwise, judging whether the fans with the faults in the fan set are larger than 1 or not, if so, reducing the maximum output power of the photovoltaic inverter and then entering the temperature control mode, otherwise, directly entering the temperature control mode, wherein the temperature control mode is that the running state of the fan set is controlled according to the real-time temperature value of the radiator;
and S3, controlling the fan group to perform air cooling heat dissipation on the radiator and the power device of the photovoltaic inverter.
7. The method for controlling heat dissipation of a photovoltaic inverter according to claim 6, wherein the step S1 specifically includes the steps of:
the method comprises the steps of receiving an environment real-time temperature value, a radiator real-time temperature value respectively collected by a plurality of temperature collection units arranged at different positions of a radiator, and a power device real-time temperature value respectively collected by a temperature collection unit arranged in each power device.
8. The method for controlling heat dissipation of a photovoltaic inverter according to claim 7, wherein the temperature control mode of step S2 specifically includes the following steps:
s21, judging whether the real-time temperature value of the radiator is higher than a first radiator temperature threshold value, if so, executing a step S22, otherwise, executing a step S23;
s22, judging whether the real-time temperature value of the radiator is higher than or equal to a second radiator temperature threshold value or whether the real-time temperature value of the power device is higher than or equal to a first power device temperature threshold value or whether the real-time temperature value of the environment is higher than or equal to a first environment temperature threshold value, if so, reducing the maximum output power of the photovoltaic inverter, and then executing a step S24, otherwise, controlling the up-down gear of the fan set according to the real-time temperature value of the radiator, wherein the second radiator temperature threshold value is larger than the first radiator temperature threshold value;
s23, judging whether the real-time temperature value of the radiator is higher than a fourth radiator temperature threshold value, if so, maintaining the rotating speed of the fan set at the current gear, otherwise, closing the fan set, and enabling the first radiator temperature threshold value to be larger than the fourth radiator temperature threshold value;
s24, judging whether the real-time temperature value of the radiator is higher than or equal to a third radiator temperature threshold value or whether the real-time temperature value of the power device is higher than or equal to a second power device temperature threshold value or whether the real-time temperature value of the environment is higher than or equal to a second environment temperature threshold value, if so, controlling the photovoltaic inverter to shut down, reporting an over-temperature fault, and returning to a standby state, wherein the third radiator temperature threshold value is larger than the second radiator temperature threshold value, the second power device temperature threshold value is larger than the first power device temperature threshold value, and the second environment temperature threshold value is larger than the first environment temperature threshold value.
9. The heat dissipation control method of a photovoltaic inverter according to claim 8, characterized in that: the step S22 of controlling the lifting gear of the fan set according to the real-time temperature value of the heat sink specifically includes the following steps:
the method comprises the steps that the lowest gear of a fan is started only when the real-time temperature value of the radiator is higher than a first radiator temperature threshold value for the first time, and then the real-time temperature value of the radiator is controlled to be shifted by one when the real-time temperature value of the radiator rises by one preset gear threshold value to increase the rotating speed of the fan until the fan is shifted to the highest gear, and the real-time temperature value of the radiator is controlled to be shifted by one when the real-time temperature value of the radiator drops by one preset gear threshold value to reduce the rotating speed of the fan until the fan is shifted to the lowest gear.
10. The heat dissipation control method of a photovoltaic inverter according to claim 7, characterized in that: the following steps are also included between the step S1 and the step S2:
and judging whether the temperature difference among the radiator real-time temperature value, the power device real-time temperature value and the environment real-time temperature value and the corresponding absolute values are all within a preset normal range, if so, executing a step S2, otherwise, reducing the maximum output power of the photovoltaic inverter and then entering a power control mode, wherein the power control mode is to control the running state of the fan set according to the real-time output power of the photovoltaic inverter.
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| CN112153870A (en) * | 2020-09-25 | 2020-12-29 | 科华恒盛股份有限公司 | Heat radiation structure and inverter |
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