Heating and dehumidifying control method and system for electric control cabinet

Abstract

The invention provides an electric control cabinet heating and dehumidifying control method, which comprises the following steps: after power-on initialization of an electric control cabinet is completed, acquiring a first temperature value and a power-off time difference in the electric control cabinet, and heating the electric control cabinet and starting control power-on according to the first temperature value and the power-off time difference in the electric control cabinet; acquiring a first humidity value in the electric control cabinet, and dehumidifying the electric control cabinet according to the first humidity value; a second temperature value and a second humidity value in the electric control cabinet are obtained, and if the second temperature value and the second humidity value are both larger than the preset values, the electric control cabinet executes the starting program. According to the invention, the problem of unstable operation of the electric control cabinet in a low-temperature and high-humidity environment in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the field of wind power technology, and in particular to a heating and dehumidification control method and system for an electric control cabinet. Background Art

[0002] The electric control cabinet is composed of numerous electrical components, and most of them have specific requirements for the operating environment, such as integrated circuit boards, power electronic devices, capacitors, etc. Many electrical components cannot work normally in low temperature or high humidity environments.

[0003] As an indispensable component of wind turbines, the stability of the operation of the electric control cabinet is related to the reliable operation of the unit. In areas with abundant wind resources in China, the extreme low temperature in winter can reach about -40℃. Therefore, when designing the electric control cabinet, it is necessary to consider the impact of the low temperature environment on the performance of components. Another problem is that when the humidity of the environment where the electric control cabinet is located is high, the dew point temperature of the cabinet body changes with the change of the ambient temperature. In a high humidity environment (such as an offshore wind farm), condensation is very likely to occur, which has a great harm to the operation of the electric control cabinet.

[0004] Therefore, to ensure the efficient and stable operation of wind power control cabinets, on the one hand, it is necessary to combine the unique performance of each electrical component and carry out targeted heating and dehumidification design of the control cabinet to resist low temperature and high humidity, such as using heating belts and heating resistors to heat specific components (such as UPS power supply, converter control board); on the other hand, it is necessary to consider scientific and reasonable heating and dehumidification measures for the control cabinet to ensure that the temperature and humidity of the control cabinet meet the actual operation needs and ensure the efficient and stable operation of the control cabinet. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a heating and dehumidification control method for an electric control cabinet, which solves the problem of unstable operation of the electric control cabinet under a low temperature and high humidity environment in the prior art.

[0006] According to an embodiment of the present invention, a method for controlling heating and dehumidification of an electric control cabinet includes:

[0007] After the power-on initialization of the electric control cabinet is completed, a first temperature value and a power-off time difference in the electric control cabinet are obtained, and according to the first temperature value and the power-off time difference in the electric control cabinet, the electric control cabinet is heated and the control circuit is started to be powered on;

[0008] Acquire a first humidity value in the electric control cabinet, and continuously dehumidify the electric control cabinet according to the first humidity value;

[0009] The second temperature value and the second humidity value in the electric control cabinet are obtained. If the second temperature value is greater than the temperature start threshold and the second humidity value is less than the humidity start threshold, the electric control cabinet executes the start procedure.

[0010] Preferably, the method for heating the electric control cabinet and starting the control circuit to power on includes:

[0011] comparing the first temperature value to a power-on temperature threshold;

[0012] In response to the first temperature value being less than the power-on temperature threshold, heating for a first preset time, then reacquiring the first temperature value in the electric control cabinet, and comparing the first temperature value with the power-on temperature threshold;

[0013] In response to the first temperature value being greater than the power-on temperature threshold, the electric control cabinet starts controlling the power-on;

[0014] Compare the power-off time difference with the power-off threshold;

[0015] In response to the power-off time difference being less than the power-off threshold, not performing heating;

[0016] In response to the power-off time difference being greater than the power-off threshold, heating is performed for a second preset time.

[0017] Preferably, after the power-on initialization of the electric control system is completed, the current power-on time of the electric control cabinet and the last power-off time saved by the electric control cabinet are obtained, and the difference between the power-on time and the power-off time is set as the power-off time difference.

[0018] Preferably, after heating for a first preset time, the water temperature at the water inlet of the water cooling and heating system is monitored in real time. If the water temperature at the water inlet is lower than the preset water temperature, heating is continued until the water temperature at the water inlet is higher than the preset water temperature.

[0019] Preferably, during the dehumidification process of the electric control cabinet, the temperature difference between the inside and outside of the electric control cabinet is obtained at fixed intervals. If the temperature difference is greater than a preset temperature difference, the water cooling and heating system is restarted until the temperature difference is less than the preset temperature difference.

[0020] Preferably, after obtaining the second temperature value and the second humidity value in the electric control cabinet, if the second temperature value or the second humidity value is less than a preset value, the heating operation or the dehumidification operation is repeated until the second temperature value and the second humidity value are both greater than the preset value.

[0021] On the other hand, according to an embodiment of the present invention, there is also provided an electric control cabinet heating and dehumidification control system, which adopts the above-mentioned electric control cabinet heating and dehumidification control method, including:

[0022] A water cooling and heating system, which is used to heat the internal environment of the electric control cabinet;

[0023] A dehumidification fan, which is used to dehumidify the internal environment of the electric control cabinet and drive the hot air in the electric control cabinet to flow in the electric control cabinet;

[0024] A temperature sensor and a humidity sensor, the temperature sensor is used to detect a first temperature value and a second temperature value in the electric control cabinet, respectively, and the humidity sensor is used to detect a first humidity value and a second humidity value in the electric control cabinet;

[0025] The main control system, the water cooling and heating system, the temperature sensor, the humidity sensor and the dehumidification fan are all electrically connected to the main control system. The main control system is used to obtain the power-off time difference after the power-on initialization of the electric control cabinet is completed, and to heat the electric control cabinet according to the first temperature value and the power-off time difference; to dehumidify the electric control cabinet according to the first humidity value; and to control the electric control cabinet to execute the startup program according to the second temperature value and the second humidity value.

[0026] Preferably, the main control system includes a judgment module and a control module, the judgment module is used to compare the first temperature value, the power off time difference, the first humidity value, the second temperature value and the second humidity value with the corresponding threshold values ​​respectively, and the control module is used to control the water cooling and heating system, the temperature sensor, the humidity sensor and the dehumidification fan.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention adopts a water-cooling and heating system to heat the electric control, and the heating is stable and uniform. A dehumidifying fan is used to dehumidify the internal environment of the electric control cabinet while driving the hot air in the electric control cabinet to flow in the electric control cabinet, so that the temperature in the electric control cabinet is evenly increased. At the same time, by detecting the temperature in the electric control cabinet and the power-off time difference, the water-cooling and heating system is controlled to heat the electric control cabinet. The electric control cabinet is powered on only when a certain temperature is reached, thereby ensuring the stable operation of components in the electric control cabinet in a low temperature environment and avoiding damage to components when running in an extreme environment due to direct power-on. By dehumidifying the electric control cabinet after the temperature reaches the standard, condensation can also be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a heating and dehumidification control flow chart of an embodiment of the present invention.

[0030] Figure 2 This is an architecture diagram of a heating and dehumidification control system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0032] like Figure 1 As shown, the embodiment of the present invention proposes a heating and dehumidification control method for an electric control cabinet, comprising:

[0033] After the power-on initialization of the electric control cabinet is completed, a first temperature value and a power-off time difference in the electric control cabinet are obtained, and according to the first temperature value and the power-off time difference in the electric control cabinet, the electric control cabinet is heated and the control circuit is started to be powered on;

[0034] When the electric control cabinet is powered on, it automatically executes a self-test program to detect the status of all its components and complete initialization. Then, the temperature sensor detects the first temperature value inside the electric control cabinet and compares the first temperature value with the power-on temperature threshold (in the present invention, the power-on temperature threshold is 5°C as an example).

[0035] If the first temperature value is less than the power-on temperature threshold, heating is performed for the first preset time, which is 60 minutes by default. After heating for the first preset time, the water inlet temperature of the water cooling and heating system is monitored in real time. If the water inlet temperature is less than the preset water temperature (20°C), heating is continued until the water inlet temperature is greater than the preset water temperature. Then the first temperature value in the electrical control cabinet is obtained again and compared with the power-on temperature threshold.

[0036] If the first temperature value is greater than the power-on temperature threshold, the electric control cabinet starts to control the power-on, that is, the electric control cabinet meets the startup condition.

[0037] Afterwards, the current power-on time of the electric control cabinet and the last power-off time saved by the electric control cabinet are obtained, and the difference between the power-on time and the power-off time is set as the power-off time difference. At the same time, the power-off time difference is compared with the power-off threshold (in the present invention, the power-off threshold is 48h as an example). If the power-off time difference is less than the power-off threshold, no heating is performed;

[0038] In response to the power-off time difference being greater than the power-off threshold, heating is performed for a second preset time, and the second preset time is calculated according to the following formula:

[0039] T=(Δt-Tset) / 10

[0040] Wherein, T is the second preset time, Δt is the power-off time difference, and Tset is the default value, which is a fixed value.

[0041] In addition, the second preset time is at least 240 minutes, so if the second preset time finally calculated is less than 240 minutes, the second preset time is directly set to 240 minutes.

[0042] After heating, the electric control cabinet starts to control the power supply, and each electrical component in the electric control cabinet is energized.

[0043] Acquire a first humidity value in the electric control cabinet, and continuously dehumidify the electric control cabinet according to the first humidity value;

[0044] The first humidity value in the electric control cabinet is obtained through the humidity sensor. If the first humidity value is greater than 85%, the electric control cabinet will start to be dehumidified. At the same time, after the dehumidification operation starts, the dehumidification will always remain in the started state and will not stop except in special circumstances. In addition to ensuring that the humidity in the electric control cabinet is always below a certain level, the hot air in the electric control cabinet can also be circulated in the electric control cabinet to evenly heat the inside of the electric control cabinet.

[0045] During the dehumidification process of the electric control cabinet, the temperature difference inside and outside the electric control cabinet is obtained at fixed intervals. If the temperature difference is greater than the preset temperature difference (3°C), the water cooling and heating system is restarted until the temperature difference is less than the preset temperature difference.

[0046] The second temperature value and the second humidity value in the electric control cabinet are obtained. If the second temperature value is greater than the temperature start threshold and the second humidity value is less than the humidity start threshold, the electric control cabinet executes the start procedure.

[0047] After heating and dehumidification are completed, the second temperature value and the second humidity value in the electric control cabinet are obtained. If the second temperature value is greater than the temperature start threshold (10°C) and the second humidity value is less than the humidity start threshold (85%), it indicates that the electric control cabinet is in a normal operating environment, the electric control cabinet starts to execute the startup procedure, and the electric control cabinet starts to operate normally.

[0048] If the second temperature value is less than 10°C or the second humidity value is greater than 85%, the water cooling and heating system and the dehumidification fan are restarted respectively to heat and dehumidify the electric control cabinet until the second temperature value is greater than 10°C and the second humidity value is less than 85%.

[0049] On the other hand, Figure 2 As shown, an embodiment of the present invention further provides an electric control cabinet heating and dehumidification control system, which adopts the above-mentioned electric control cabinet heating and dehumidification control method, including:

[0050] A water cooling and heating system, which is used to heat the internal environment of the electric control cabinet;

[0051] A dehumidification fan, which is used to dehumidify the internal environment of the electric control cabinet and drive the hot air in the electric control cabinet to flow in the electric control cabinet;

[0052] A temperature sensor and a humidity sensor, the temperature sensor is used to detect a first temperature value and a second temperature value in the electric control cabinet, respectively, and the humidity sensor is used to detect a first humidity value and a second humidity value in the electric control cabinet;

[0053] Start the water cooling system heater to heat the cooling water in the cooling system, circulate the heated water in the cooling circuit and avoid "dry burning" of the heater. At the same time, the purpose of turning on the dehumidification fan in the electrical control cabinet is that after the heated water circulates in the entire cooling pipe, the heat will be dissipated to the surrounding of the pipe by heat transfer. At this time, it is necessary to turn on the dehumidification fan in the cabinet to bring the heat around the pipe to other places in the cabinet, and finally heat the entire electrical control cabinet.

[0054] The main control system includes a judgment module and a control module. The judgment module is used to compare the first temperature value, the power-off time difference, the first humidity value, the second temperature value and the second humidity value with the corresponding threshold values ​​respectively. The water cooling and heating system, the temperature sensor, the humidity sensor and the dehumidification fan are all electrically connected to the control module. The control module is used to control the water cooling and heating system, the temperature sensor, the humidity sensor and the dehumidification fan. The main control system is used to obtain the power-off time difference after the power-on initialization of the electric control cabinet is completed, and heat the electric control cabinet according to the first temperature value and the power-off time difference; dehumidify the electric control cabinet according to the first humidity value; and control the electric control cabinet to execute the startup program according to the second temperature value and the second humidity value.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A heating and dehumidification control method for an electric control cabinet, characterized in that: include: After the power-on initialization of the electric control cabinet is completed, a first temperature value and a power-off time difference in the electric control cabinet are obtained, and according to the first temperature value and the power-off time difference in the electric control cabinet, the electric control cabinet is heated and the control circuit is started to be powered on; Acquire a first humidity value in the electric control cabinet, and continuously dehumidify the electric control cabinet according to the first humidity value; The second temperature value and the second humidity value in the electric control cabinet are obtained. If the second temperature value is greater than the temperature start threshold and the second humidity value is less than the humidity start threshold, the electric control cabinet executes the start procedure.

2. The method for controlling heating and dehumidification of an electric control cabinet according to claim 1, characterized in that: The method for heating the electric control cabinet and starting the control circuit includes: comparing the first temperature value to a power-on temperature threshold; In response to the first temperature value being less than the power-on temperature threshold, heating for a first preset time, then reacquiring the first temperature value in the electric control cabinet, and comparing the first temperature value with the power-on temperature threshold; In response to the first temperature value being greater than the power-on temperature threshold, the electric control cabinet starts controlling the power-on; Compare the power-off time difference with the power-off threshold; In response to the power-off time difference being less than the power-off threshold, not performing heating; In response to the power-off time difference being greater than the power-off threshold, heating is performed for a second preset time.

3. The method for controlling heating and dehumidification of an electric control cabinet according to claim 1, characterized in that: After the power-on initialization of the electric control system is completed, the current power-on time of the electric control cabinet and the last power-off time saved by the electric control cabinet are obtained, and the difference between the power-on time and the power-off time is set as the power-off time difference.

4. The method for controlling heating and dehumidification of an electric control cabinet according to claim 1, characterized in that: After heating for a first preset time, the water temperature at the water inlet of the water cooling and heating system is monitored in real time. If the water temperature at the water inlet is lower than the preset water temperature, heating is continued until the water temperature at the water inlet is higher than the preset water temperature.

5. The electric control cabinet heating and dehumidification control method according to claim 1, characterized in that: During the dehumidification process of the electric control cabinet, the temperature difference between the inside and outside of the electric control cabinet is obtained at fixed intervals. If the temperature difference is greater than the preset temperature difference, the water cooling and heating system is restarted until the temperature difference is less than the preset temperature difference.

6. The electric control cabinet heating and dehumidification control method according to claim 1, characterized in that: After obtaining the second temperature value and the second humidity value in the electric control cabinet, if the second temperature value or the second humidity value is less than the preset value, the heating operation or the dehumidification operation is repeated until the second temperature value and the second humidity value are both greater than the preset value.

7. A heating and dehumidification control system for an electric control cabinet, characterized in that: The system adopts a heating and dehumidification control method for an electric control cabinet as claimed in any one of claims 1 to 6, comprising: A water cooling and heating system, which is used to heat the internal environment of the electric control cabinet; A dehumidification fan, which is used to dehumidify the internal environment of the electric control cabinet and drive the hot air in the electric control cabinet to flow in the electric control cabinet; A temperature sensor and a humidity sensor, the temperature sensor is used to detect a first temperature value and a second temperature value in the electric control cabinet, respectively, and the humidity sensor is used to detect a first humidity value and a second humidity value in the electric control cabinet; The main control system, the water cooling and heating system, the temperature sensor, the humidity sensor and the dehumidification fan are all electrically connected to the main control system. The main control system is used to obtain the power-off time difference after the power-on initialization of the electric control cabinet is completed, and to heat the electric control cabinet according to the first temperature value and the power-off time difference; to continuously dehumidify the electric control cabinet according to the first humidity value; and to control the electric control cabinet to execute the startup procedure according to the second temperature value and the second humidity value.

8. The electric control cabinet heating and dehumidification control system according to claim 1, characterized in that: The main control system includes a judgment module and a control module. The judgment module is used to compare the first temperature value, the power-off time difference, the first humidity value, the second temperature value and the second humidity value with the corresponding threshold values ​​respectively. The control module is used to control the water cooling and heating system, the temperature sensor, the humidity sensor and the dehumidification fan.

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