Anti-icing control method for power equipment, power equipment and storage medium

Abstract

The application discloses an anti-icing control method of a power device, the power device and a storage medium, and the power device comprises a heat dissipation fan (11), a heating element (12) and an air duct, and the method comprises the following steps: when the power device is in a non-working state and the temperature and humidity at an air inlet (13) of the air duct meet preset conditions, the heat dissipation fan (11) is controlled to be reversed, so that the operation waste heat of the heating element (12) is driven to the air inlet (13). The application does not need to additionally install a heating device, the waste heat generated by the heating element itself is guided to the air inlet, the anti-icing is realized by using the self-heating of the device, the application has the advantages of low cost, low energy consumption and high reliability, and effectively solves the technical problem of icing and blockage of the air inlet of the air duct of the power device in a low-temperature and high-humidity environment.

Description

Technical Field

[0001] This invention relates to the field of power equipment technology, specifically to an anti-icing control method for power equipment, power equipment, and storage medium. Background Technology

[0002] Centralized photovoltaic power plants and large-capacity energy storage power plants are being deployed extensively in cold regions such as high altitudes and high latitudes. In these areas, nighttime temperatures often remain below freezing during winter, and air humidity is high. Supercooled water droplets in the air easily condense and freeze on the surfaces of electrical equipment. Centralized inverters, energy storage cabinets, and other electrical equipment generally rely on forced-air cooling ducts for heat dissipation, requiring the intake of outside air to remove heat generated by internal components during operation. However, at night, when the equipment switches from operating to standby or shutdown, the load decreases, heat generation decreases, and the temperature of the duct walls drops rapidly with the ambient temperature. At this time, the cold, humid outside air easily condenses into ice on the low-temperature surfaces of the duct inlets and filters. The accumulated ice layer can block the air intake channels, or even completely seal them off, leading to reduced or even complete failure of the equipment's heat dissipation performance. This results in a significant reduction in power generation the following day, causing economic losses. Furthermore, for grid-connected power plants, large-scale equipment shutdowns due to icing can also affect grid stability.

[0003] To address the issue of duct icing in cold regions, the industry currently mainly employs passive protection methods (such as spraying hydrophobic coatings), active electric heating de-icing, and shutdown de-icing. However, these methods suffer from drawbacks such as insufficient reliability under sustained low temperatures, reliance on additional heating devices with high energy consumption, and reduced power generation efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide an anti-icing control method for power equipment, so as to achieve anti-icing control that requires no additional heating device, consumes little energy, and is highly efficient and reliable.

[0005] To achieve one of the above-mentioned objectives, an embodiment of the present invention provides an anti-icing control method for power equipment, wherein the power equipment includes a cooling fan (11), a heating element (12), and an air duct, and the method includes: when the power equipment is in a non-working state and the temperature and humidity at the air inlet (13) of the air duct meet preset conditions, controlling the cooling fan (11) to reverse so as to drive the residual heat of the heating element (12) to the air inlet (13).

[0006] As a further improvement of one embodiment of the present invention, the temperature and humidity at the air inlet (13) of the air duct meet the preset conditions, including: the temperature value at the air inlet (13) is lower than the first preset temperature threshold, and the humidity value at the air inlet (13) is greater than the preset humidity threshold.

[0007] As a further improvement of one embodiment of the present invention, the heating element (12) includes at least one of the following: a power electronic module (12a), a magnetic element inductor (12b), and an energy storage cell.

[0008] As a further improvement of one embodiment of the present invention, the control of the cooling fan (11) to reverse includes: when it is determined that the heat-generating element (12) has residual heat during operation, controlling the cooling fan (11) to reverse.

[0009] As a further improvement of one embodiment of the present invention, after controlling the cooling fan (11) to reverse, the method further includes: when the temperature value at the air inlet (13) is higher than the second preset temperature threshold, controlling the cooling fan (11) to stop reversing; wherein the second preset temperature threshold is greater than the first preset temperature threshold.

[0010] As a further improvement of one embodiment of the present invention, the control of the cooling fan (11) to reverse includes: controlling the cooling fan (11) to reverse at a low speed.

[0011] As a further improvement of one embodiment of the present invention, the step of controlling the cooling fan (11) to reverse at a low speed includes: determining the target temperature range of the air inlet (13) in three preset temperature ranges; the three temperature ranges are 0°C to 2°C, -2°C to 0°C, and below -2°C, and the three temperature ranges correspond to a first speed, a second speed, and a third speed, respectively, with the first speed < the second speed < the third speed; controlling the cooling fan (11) to reverse and the speed is the speed corresponding to the target temperature range.

[0012] As a further improvement of one embodiment of the present invention, the method further includes: when the power equipment changes from a non-working state to a working state, if there is icing at the air inlet (13), the power equipment is controlled to operate in a low-power mode and the cooling fan (11) is controlled to reverse. The low-power mode means that the operating power of the power equipment is lower than the rated power. When there is no icing at the air inlet (13), the power equipment is controlled to operate in a rated power mode and the cooling fan (11) is controlled to rotate forward.

[0013] As a further improvement of one embodiment of the present invention, the method further includes: when the temperature difference between the heating element (12) and the air inlet (13) does not exceed a preset temperature difference threshold, it is determined that there is no icing phenomenon at the air inlet (13); when the temperature difference between the heating element (12) and the air inlet (13) exceeds the preset temperature difference threshold, and the temperature at the air inlet (13) is lower than a third preset temperature threshold, it is determined that there is icing phenomenon at the air inlet (13).

[0014] As a further improvement of one embodiment of the present invention, after controlling the power equipment to operate in low power mode and controlling the cooling fan (11) to reverse, when the temperature value at the air inlet (13) is detected to be higher than the fourth preset temperature threshold, the power equipment is controlled to operate in rated power mode and the cooling fan (11) is controlled to rotate forward, wherein the fourth preset temperature threshold is greater than the third preset temperature threshold.

[0015] One embodiment of the present invention also provides an electrical device, which includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the method described above.

[0016] One embodiment of the present invention also provides a storage medium storing a computer program that, when executed by a processor, implements the method described above.

[0017] The beneficial effects of this invention are as follows:

[0018] (1) No additional electric heating device is required. By directing the heat generated by the heating element of the power equipment to the air duct or air inlet, the equipment can achieve anti-icing and de-icing by heating itself. This does not increase the equipment cost and the de-icing energy consumption is extremely low, which significantly reduces the power station's self-consumption cost. (2) The anti-icing mode and the de-icing mode are used in a coordinated control manner. When the power equipment is in a non-working state (e.g., the equipment is on standby at night), the residual heat of the device operation is used to maintain the air inlet temperature and prevent ice formation. When the power equipment enters the working state (e.g., the daytime start-up conditions are met), if there is ice, it is started at low power first, and the heat of the device operation is used to melt the ice before normal operation. This does not affect daytime power generation and can completely solve the icing problem.

[0019] (3) No additional heating device is required, which avoids the safety hazards of sealing failure, leakage, and short circuit of the heating device in low temperature and humid environment. At the same time, the fan reversal only changes the airflow direction and does not increase mechanical complexity, so the system has high reliability. Attached Figure Description

[0020] Figure 1This is a schematic diagram of the air duct of the power equipment when the cooling fan of the present invention is rotating in the forward direction; Figure 2 This is a schematic diagram of the power equipment air duct when the cooling fan of the present invention reverses direction; Figure 3 This is a flowchart of the power equipment anti-icing control method under non-working conditions according to the present invention; Figure 4 This is a flowchart of a method for preventing icing of power equipment in a non-working state, according to a further embodiment of the present invention. Figure 5 This is a flowchart of the anti-icing control method for power equipment when it switches to working state according to the present invention; Figure 6 This is a flowchart of the present invention for determining the phenomenon of icing at the air inlet; Figure 7 This is a flowchart of an anti-icing control method for power equipment when it switches to working state, which is a further embodiment of the present invention. Detailed Implementation

[0021] To address the issue of duct icing in cold regions, the industry currently employs passive protection methods (such as spraying hydrophobic coatings), active electric heating de-icing, and shutdown de-icing. Passive protection involves spraying a hydrophobic anti-icing coating onto the equipment casing to reduce the adhesion between ice and the casing. However, this only alleviates ice adhesion and cannot prevent icing inside the duct. When low temperatures persist for extended periods at night, ice will gradually accumulate and clog the duct. Active electric heating de-icing involves adding a heating device at the duct inlet to heat the duct wall and prevent icing. However, this increases power consumption and reduces power generation revenue; furthermore, the heating device's sealing performance is easily compromised due to prolonged exposure to low temperatures and humidity, posing safety hazards such as leakage and short circuits. Shutdown de-icing involves stopping equipment operation and manually removing ice, but this leads to prolonged equipment downtime and reduced power generation efficiency. Therefore, this invention provides a method for preventing icing in power equipment, achieving low-energy, efficient, and reliable icing control without the need for additional heating devices.

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0023] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0024] Figure 1 This diagram illustrates the airflow path of an electrical device when the cooling fan is rotating forward, according to one embodiment of the present invention. Figure 2 A schematic diagram of the airflow duct of an electrical device is shown in one embodiment of the present invention when the cooling fan reverses direction. For example... Figure 1 and Figure 2 As shown, the power equipment includes a cooling fan 11, a heating element 12, and an air duct. The air duct has an air inlet 13 and an air outlet 14, and the cooling fan 11 is installed inside the air duct. The air inlet 13 is usually equipped with a filter or other protective structure to filter dust and impurities from the outside air.

[0025] The heat-generating element 12 is a component that generates heat during the operation of the power equipment. In this embodiment, the heat-generating element 12 includes, but is not limited to, at least one of the following: a power electronic module 12a (e.g., an insulated-gate bipolar transistor (IGBT), a metal-oxide-semiconductor field-effect transistor (MOSFET), or other power switching devices), a magnetic component inductor 12b (e.g., a filter inductor, a transformer), or an energy storage cell (e.g., a lithium-ion battery cell, a sodium-ion battery cell). It is understood that during the operation of the power equipment, the aforementioned heat-generating element 12 will generate a large amount of heat. This heat is carried away by airflow driven by the forward rotation of the cooling fan 11 during conventional heat dissipation, such as... Figure 1 As shown. In particular, for example, the magnetic element inductor 12b has a large heat capacity, and its temperature takes a long time to gradually drop to the ambient temperature after the electrical equipment stops operating. The embodiment of the present invention utilizes this residual heat to prevent icing of the electrical equipment when it is not in operation, thus eliminating the need for additional heating devices.

[0026] Cooling fan 11 is a reversible fan, such as an axial fan. When cooling fan 11 rotates forward, as... Figure 1 As shown, outside air enters the air duct through the air inlet 13, flows through the heating element 12, and is discharged from the air outlet 14, achieving forced air cooling of the heating element 12. When the cooling fan 11 reverses direction, as... Figure 2 As shown, the airflow direction is opposite. Air in the duct is drawn in from the outlet 14 side, flows through the heating element 12, and is discharged from the inlet 13, thereby carrying the residual heat from the operation of the heating element 12 to the inlet 13 to heat the inlet 13 and the filter. With the above settings, the anti-icing function can be achieved without the need for additional heating devices, without increasing equipment costs, and the de-icing energy consumption is extremely low.

[0027] Figure 3 A flowchart of an anti-icing control method for power equipment in a non-operating state, according to one embodiment of the present invention, is shown. Figure 3 As shown, the anti-icing control method may include the following steps.

[0028] Step S101: When the power equipment enters a non-working state, monitor the temperature and humidity at the air inlet 13.

[0029] The non-operating state refers to the state in which electrical equipment is not outputting power or the load is not working, such as standby, shutdown, or hibernation at night. In application scenarios such as centralized photovoltaic power stations and large-capacity energy storage power stations, equipment is usually in standby or shutdown state at night. At this time, the load is reduced and the heat generation is reduced, and the temperature of the inner wall of the air duct will drop rapidly with the ambient temperature. The cold and humid air outside is very likely to condense into ice on the low-temperature surfaces such as the air inlet and filter screen of the air duct. Therefore, it is particularly important to start anti-icing control in the non-operating state.

[0030] Specifically, a temperature sensor and a humidity sensor (or an integrated temperature and humidity sensor) can be installed at the air inlet 13 to collect the temperature and humidity values ​​at the air inlet 13 in real time.

[0031] Step S102: Determine whether the temperature and humidity at the air inlet 13 meet the preset conditions. If the preset conditions are met, proceed to step S103; otherwise, continue monitoring.

[0032] In this embodiment, the temperature and humidity at the air inlet 13 of the air duct meet preset conditions, specifically including: the temperature at the air inlet 13 is lower than a first preset temperature threshold, and the humidity at the air inlet 13 is higher than a preset humidity threshold. The first preset temperature threshold can be set according to the actual application scenario, for example, it can be set to 2℃, 0℃, -2℃, or -5℃, to indicate that the air inlet 13 has reached a low temperature state where icing is possible. The preset humidity threshold can be set according to the actual application scenario, for example, it can be set to a relative humidity of 60%, 70%, or 80%, to indicate that the moisture content in the air at the air inlet 13 has reached a humid state where icing is likely. When the temperature at the air inlet 13 is lower than the first preset temperature threshold and the humidity is higher than the preset humidity threshold, it indicates that there is a risk of icing at the air inlet 13.

[0033] Step S103: When the temperature and humidity at the air inlet 13 meet the preset conditions, control the cooling fan 11 to reverse so as to drive the residual heat from the heating element 12 to the air inlet 13. Specifically, when an ice-forming risk is detected at the air inlet 13, the controller controls the cooling fan 11 to reverse so that the airflow direction flows from the air outlet 14 side to the air inlet 13 side, carrying the residual heat from the heating element 12 to the air inlet 13 to heat the air inlet 13 and prevent ice formation at the air inlet 13 due to low temperature and humidity.

[0034] In some embodiments, controlling the cooling fan 11 to reverse direction may include controlling the cooling fan 11 to reverse at a low speed. Low speed refers to a relatively low fan speed. For example, the speed at which the fan operates at its rated power is called the rated speed. The low speed can be 0.1 times, 0.2 times, 0.3 times, or other reasonable values ​​of the rated speed. It is understood that because the cooling fan 11 rotates at a lower speed when reversing, i.e., the fan rotates more slowly, less heat is carried out by the fan per unit time. This achieves the purpose of slowly dissipating residual heat and enhances the reliability of anti-icing.

[0035] In some implementations, the low rotational speed can be set to a fixed value.

[0036] In other embodiments, the low speed can be set to three levels, adjusted according to the temperature at the air inlet 13. This embodiment sets three speed values: a first speed, a second speed, and a third speed, with the first speed < the second speed < the third speed. It can be understood that these three speeds are generally considered low speeds, for example, all lower than the rated speed, such as 0.15 times, 0.3 times, and 0.5 times the rated speed, respectively. Furthermore, this embodiment also sets three temperature ranges: 0℃ to 2℃, -2℃ to 0℃, and below -2℃, corresponding one-to-one with the first, second, and third speeds. Specifically, controlling the cooling fan 11 to reverse can include: determining the target temperature range at the air inlet 13 within the three preset temperature ranges, controlling the cooling fan 11 to reverse and operate at the speed corresponding to that target temperature range. That is, determining which temperature range the air inlet 13 is in, and then controlling the fan to reverse using the speed corresponding to that temperature range. It should be noted that when the temperature at the air inlet 13 is between 0℃ and 2℃, the fan reverses at the lowest speed (first rotation speed) to maintain the temperature at the air inlet 13 as much as possible. When the temperature at the air inlet 13 is between -2℃ and 0℃, since the supercooling is relatively small between -2℃ and 0℃, the sublimation rate is in a slow growth stage, and the fan reverses at the second lowest speed (second rotation speed) to achieve a gentle temperature increase. When the temperature at the air inlet 13 is below -2℃, since the supercooling is increased at this time, the sublimation rate is significantly accelerated, and the fan reverses at the third speed (third rotation speed) to raise the temperature as quickly as possible.

[0037] In a further implementation, such as Figure 4 As shown, after controlling the cooling fan 11 to reverse in step S103, the method may further include the following steps.

[0038] Step S104: Continuously monitor the temperature change at the air inlet 13 to evaluate the anti-icing effect. Specifically, collect the temperature value at the air inlet 13 and determine whether the temperature value at the air inlet 13 is higher than the second preset temperature threshold. If yes, proceed to step S105; otherwise, continue to control the cooling fan 11 to reverse. The second preset temperature threshold is greater than the first preset temperature threshold. The second preset temperature threshold can be understood as a safe temperature threshold. When the temperature value at the air inlet 13 is higher than this threshold, it indicates that the air inlet 13 is within a safe temperature range and there is no risk of icing.

[0039] Step S105: Control the cooling fan 11 to stop reversing. When the temperature at the air inlet 13 is higher than the second preset temperature threshold, it indicates that the residual heat from the heating element 12 has heated the air inlet 13 to a safe temperature. At this point, the cooling fan 11 can be controlled to stop reversing to avoid unnecessary energy consumption. Afterwards, the process can return to step S101 to continue monitoring the temperature and humidity at the air inlet 13. When the temperature and humidity again meet the preset conditions, the cooling fan 11 is restarted to reverse, and this cycle repeats to achieve continuous anti-icing control during non-working periods. Through this method, automatic start and stop of anti-icing control is achieved, minimizing energy consumption while ensuring the anti-icing effect.

[0040] Furthermore, to achieve low-power operation of the cooling fan 11 and ensure the reliability of the method, in step S103, controlling the cooling fan 11 to reverse specifically includes: controlling the cooling fan 11 to reverse when the heating element 12 has residual operating heat. That is, the cooling fan 11 is only controlled to reverse when it is determined that the heating element 12 has residual operating heat. If the temperature of the heating element 12 has dropped to the same as the ambient temperature and there is no usable residual operating heat, then controlling the cooling fan 11 to reverse will not achieve an effective heating effect and will cause unnecessary energy consumption. In this case, maintaining the current state of the cooling fan 11 is sufficient. Through the above method, anti-icing can be achieved by utilizing the self-heating of the electrical equipment, without increasing equipment costs, and with extremely low energy consumption.

[0041] In one embodiment, the actual temperature value at the heating element 12 (e.g., power electronic module 12a or magnetic element inductor 12b) can be collected by a temperature sensor, and the temperature value can be compared with a preset waste heat temperature threshold (e.g., 5°C or 10°C higher than the ambient temperature). If the temperature value of the heating element 12 is higher than the threshold or higher than the threshold by a certain degree, it is determined that there is usable operating waste heat.

[0042] It is understood that the aforementioned "temperature value at heating element 12" should be interpreted broadly. In practical applications, when there is only one heating element 12, the temperature value refers to the measured temperature of that single heating element; when there are multiple heating elements 12, the temperature value can be selected from any one of the multiple heating elements, the average temperature of the multiple heating elements, the highest or lowest temperature value among the multiple heating elements, or the measured temperature of the heating element with the largest heat capacity as a representative value. Those skilled in the art can flexibly set the temperature acquisition object and calculation method according to the actual sensor layout, the thermal characteristics of the heating element, and the control accuracy requirements, as long as the temperature value can directly or indirectly characterize the overall thermal state of the heating element 12. Any method of acquiring, comparing, and determining the temperature values ​​of one or more heating elements, as long as it utilizes the residual heat of the heating element 12 for anti-icing control, falls within the protection scope of this invention.

[0043] Figure 5 A flowchart illustrating an anti-icing control method for power equipment transitioning from a non-operating state to an operating state according to one embodiment of the present invention is shown. Figure 5 As shown, the anti-icing control method may further include the following steps.

[0044] Step S201: The power equipment transitions from a non-operating state to an operating state. The operating state refers to the state in which the power equipment outputs power or operates under load, such as daytime power generation. When the power equipment transitions from a non-operating state (e.g., nighttime standby) to an operating state (e.g., meeting daytime start-up conditions), it is necessary to first determine whether there is icing at the air inlet 13 in order to implement appropriate start-up control strategies.

[0045] Step S202: Determine if there is icing at the air inlet 13. If yes, proceed to step S203; otherwise, proceed to step S204.

[0046] Step S203: When icing occurs at the air inlet 13, control the electrical equipment to operate in low-power mode and control the cooling fan 11 to reverse. Low-power mode means the operating power of the electrical equipment is lower than its rated power, for example, significantly lower than the rated power, such as 0.1, 0.2, 0.3, 0.4, 0.5 times, or other reasonable methods. Specifically, when icing occurs at the air inlet 13, it indicates that the air inlet 13 is blocked or partially blocked by ice. Starting the equipment directly at rated power would lead to poor heat dissipation and even overheating damage. Therefore, first control the electrical equipment to operate in low-power mode to reduce heat generation, and simultaneously control the cooling fan 11 to reverse, directing the heat generated by the heating element 12 during low-power operation to the air inlet 13 to heat and melt the ice at the air inlet 13. As the ice gradually melts, the ventilation capacity of the air inlet 13 gradually recovers. Especially when the power equipment has been shut down for a long time and is in an extremely low temperature environment, causing the air duct to freeze, it is first started up at a low power. The heat generated by the power electronic module 12a and the magnetic inductor 12b, along with the fan reversing, is used to discharge the hot air through the original air inlet 13, gradually increasing the temperature of the air inlet 13 and related components such as the filter, so as to achieve rapid ice melting.

[0047] Step S204: When there is no icing at the air inlet 13, control the electrical equipment to operate in rated power mode and control the cooling fan 11 to rotate forward. When there is no icing at the air inlet 13, it indicates that the airflow is unobstructed, and the equipment can be started directly in rated power mode, and the cooling fan 11 can be controlled to rotate forward for normal heat dissipation.

[0048] By using the above method, if ice forms on the power equipment when it enters the working state, it will be started at low power first, and the heat generated by the operation of the device will melt the ice before it can be operated normally. This will not affect daytime power generation and will completely solve the ice problem.

[0049] Figure 6 A flowchart illustrating the determination of air inlet icing phenomena is shown in one embodiment of the present invention. For example... Figure 6 As shown, step S202, determining whether there is icing at the air inlet 13, specifically includes the following steps.

[0050] Step S2021: Collect the temperature values ​​at the heating element 12 and the air inlet 13, and calculate the difference between the temperature values ​​at the heating element 12 and the air inlet 13. This difference reflects the temperature difference between the heating element 12 and the air inlet 13, and can be used to determine whether there is ice blockage at the air inlet 13.

[0051] Specifically, a temperature sensor can be installed at the heating element 12 (e.g., on or near the surface of the power electronic module 12a, on or near the surface of the magnetic element inductor 12b, etc.) to collect the temperature value at the heating element 12; at the same time, a temperature sensor can be installed at the air inlet 13 to collect the temperature value at the air inlet 13.

[0052] Step S2022: Determine whether the difference exceeds the preset temperature difference threshold. If yes, proceed to step S2024; otherwise, proceed to step S2023. The preset temperature difference threshold can be set according to the actual application scenario, for example, it can be set to 5℃, 10℃, etc.

[0053] Step S2023: When the temperature difference between the heating element 12 and the air inlet 13 does not exceed the preset temperature difference threshold, it is determined that there is no icing at the air inlet 13. When the difference is small, it indicates that the temperature at the air inlet 13 is close to the temperature at the heating element 12, the airflow is unobstructed, and heat can be exchanged normally between the air inlet 13 and the heating element 12. Therefore, it can be determined that there is no icing at the air inlet 13.

[0054] Step S2024: When the temperature difference between the heating element 12 and the air inlet 13 exceeds a preset temperature difference threshold, further determine whether the temperature at the air inlet 13 is lower than a third preset temperature threshold. If yes, proceed to step S2025; otherwise, proceed to step S2026. The third preset temperature threshold can be set according to the actual application scenario, for example, it can be set to -5℃, -10℃, or -15℃, to characterize whether the air inlet 13 is in a low-temperature icing state.

[0055] Step S2025: Determine if icing occurs at air inlet 13. When the temperature difference between the heating element 12 and the air inlet 13 exceeds a preset temperature difference threshold, and the temperature at air inlet 13 is lower than a third preset temperature threshold, it indicates that the temperature at heating element 12 is high while the temperature at air inlet 13 is extremely low, resulting in a large temperature gradient within the air duct. This is usually due to ice blocking air inlet 13, preventing effective heat transfer. Therefore, it can be determined that icing occurs at air inlet 13.

[0056] Step S2026: When the temperature difference between the heating element 12 and the air inlet 13 exceeds a preset temperature difference threshold, but the temperature at the air inlet 13 is not lower than a third preset temperature threshold, it is determined that there is airflow blockage at the air inlet 13, but it is not caused by icing (for example, it may be caused by dust accumulation on the filter, foreign objects entering, etc.). At this time, an airflow blockage alarm signal can be issued to prompt maintenance personnel to manually clean it. This is because if the temperature at the air inlet 13 is still above freezing, and the airflow obstruction is not caused by ice, directly attributing it to icing and starting a low-power de-icing mode will not only fail to solve the problem, but will also delay the handling of the actual fault. Through the above method, the two types of airflow abnormalities, namely icing blockage and non-icing blockage, can be accurately distinguished, thereby taking more targeted handling measures.

[0057] Using the above-mentioned temperature difference judgment method, there is no need to add additional sensors. The existing temperature sensor can be used to accurately determine whether there is icing at the air inlet 13, which reduces equipment costs and improves detection reliability.

[0058] Similarly, it is understandable that the aforementioned "temperature value at heating element 12" should be interpreted broadly. In practical applications, when there is only one heating element 12, the temperature value refers to the measured temperature of that single heating element; when there are multiple heating elements 12, the temperature value can be selected from any one of the multiple heating elements, the average temperature of the multiple heating elements, the highest or lowest temperature value among the multiple heating elements, or the measured temperature of the heating element with the largest heat capacity as a representative value. Those skilled in the art can flexibly set the temperature acquisition object and calculation method according to the actual sensor layout, the thermal characteristics of the heating elements, and the control accuracy requirements.

[0059] Figure 7 A flowchart illustrating an anti-icing control method for power equipment transitioning from a non-operating state to an operating state, according to a further embodiment of the present invention, is shown. Figure 7 As shown, the anti-icing control method may further include the following steps.

[0060] Step S205: Continuously monitor the temperature change at the air inlet 13 to evaluate the ice-melting effect. Specifically, detect the temperature value at the air inlet 13 and determine whether the temperature value at the air inlet 13 is higher than the fourth preset temperature threshold. If yes, proceed to step S204; otherwise, continue to control the cooling fan 11 to reverse.

[0061] The fourth preset temperature threshold is greater than the third preset temperature threshold. The fourth preset temperature threshold can be understood as the temperature threshold at which the ice melt is complete. When the temperature value at the air inlet 13 is higher than this threshold, it indicates that the ice layer at the air inlet 13 has basically melted and the ventilation capacity of the air inlet 13 has been restored. At this time, the power equipment can be controlled to switch to the rated power mode for normal operation, and the cooling fan 11 can be controlled to rotate forward for normal heat dissipation.

[0062] The above method enables automatic switching from low-power de-icing mode to rated power normal operation mode, minimizing the impact on power generation efficiency while ensuring safe equipment startup.

[0063] In another embodiment of the present invention, an electrical device is also provided, which includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the anti-icing control method as described above.

[0064] One embodiment of the present invention also provides a storage medium storing a computer program, which, when executed by a processor, implements the anti-icing control method described above.

[0065] In summary, the anti-icing control method for power equipment provided by the embodiments of the present invention has the following beneficial effects: (1) No additional electric heating device is required. By directing the heat generated by the heating element of the power equipment to the air duct or air inlet, the equipment can achieve anti-icing and de-icing by heating itself. This does not increase the equipment cost and the de-icing energy consumption is extremely low, which significantly reduces the power station's self-consumption cost. (2) The anti-icing mode and the de-icing mode are used in a coordinated control manner. When the power equipment is in a non-working state (e.g., the equipment is on standby at night), the residual heat of the device operation is used to maintain the air inlet temperature and prevent ice formation. When the power equipment enters the working state (e.g., the daytime start-up conditions are met), if there is ice, it is started at low power first, and the heat of the device operation is used to melt the ice before normal operation. This does not affect daytime power generation and can completely solve the icing problem.

[0066] (3) No additional heating device is required, which avoids the safety hazards of sealing failure, leakage, and short circuit of the heating device in low temperature and humid environment. At the same time, the fan reversal only changes the airflow direction and does not increase mechanical complexity, so the system has high reliability.

[0067] It should be noted that the specific values ​​of the various preset thresholds (first preset temperature threshold, second preset temperature threshold, third preset temperature threshold, fourth preset temperature threshold, preset humidity threshold, preset temperature difference threshold, etc.) involved in the above embodiments can be flexibly set according to actual factors such as the type of power equipment, power level, and installation environment. Those skilled in the art can adjust them according to actual needs, and all of these are within the protection scope of the present invention.

[0068] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0069] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preventing icing in power equipment, characterized in that, The power equipment includes a cooling fan (11), a heating element (12), and an air duct; the method includes: When the power equipment is in a non-working state and the temperature and humidity at the air inlet (13) of the air duct meet the preset conditions, the cooling fan (11) is controlled to reverse so as to drive the residual heat of the heating element (12) to the air inlet (13).

2. The method according to claim 1, characterized in that, The temperature and humidity at the air inlet (13) of the air duct meet the preset conditions, including: the temperature value at the air inlet (13) is lower than the first preset temperature threshold, and the humidity value at the air inlet (13) is greater than the preset humidity threshold. The heating element (12) includes at least one of the following: a power electronic module (12a), a magnetic inductor (12b), and an energy storage cell; And / or, The control of the cooling fan (11) to reverse includes: when it is determined that the heat-generating element (12) has residual heat, controlling the cooling fan (11) to reverse.

3. The method according to claim 2, characterized in that, After controlling the cooling fan (11) to reverse, the method further includes: When the temperature at the air inlet (13) is higher than the second preset temperature threshold, the cooling fan (11) is controlled to stop reversing; wherein the second preset temperature threshold is greater than the first preset temperature threshold.

4. The method according to claim 1, characterized in that, The control of the cooling fan (11) to reverse includes: Control the cooling fan (11) to reverse at low speed.

5. The method according to claim 4, characterized in that, The control of the cooling fan (11) to reverse at low speed includes: In the three preset temperature ranges, the target temperature range of the air inlet (13) is determined; the three temperature ranges are 0℃ to 2℃, -2℃ to 0℃, and below -2℃, and the three temperature ranges correspond to the first speed, the second speed, and the third speed, respectively, with the first speed < the second speed < the third speed; Control the cooling fan (11) to reverse and rotate at the speed corresponding to the target temperature range.

6. The method according to any one of claims 1-5, characterized in that, The method further includes: When the power equipment switches from a non-operating state to an operating state... When there is icing at the air inlet (13), the power equipment is controlled to operate in low power mode and the cooling fan (11) is controlled to reverse. The low power mode means that the operating power of the power equipment is lower than the rated power. When there is no icing at the air inlet (13), the power equipment is controlled to operate in rated power mode, and the cooling fan (11) is controlled to rotate in the forward direction.

7. The method according to claim 6, characterized in that, The method further includes: When the temperature difference between the heating element (12) and the air inlet (13) does not exceed the preset temperature difference threshold, it is determined that there is no icing at the air inlet (13). When the temperature difference between the heating element (12) and the air inlet (13) exceeds the preset temperature difference threshold, and the temperature at the air inlet (13) is lower than the third preset temperature threshold, it is determined that there is icing at the air inlet (13).

8. The method according to claim 7, characterized in that, After controlling the power equipment to operate in low power mode and controlling the cooling fan (11) to reverse, when the temperature value at the air inlet (13) is detected to be higher than the fourth preset temperature threshold, the power equipment is controlled to operate in rated power mode and the cooling fan (11) is controlled to rotate forward, wherein the fourth preset temperature threshold is greater than the third preset temperature threshold.

9. An electrical device, characterized in that, It includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the method as described in any one of claims 1 to 8.

10. A storage medium, characterized in that, The device contains a computer program that, when executed by a processor, implements the method as described in any one of claims 1 to 8.

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