A dust screen detection method and system for an energy storage converter

Abstract

The application discloses a dust screen detection method and system of an energy storage converter, and belongs to the field of new energy power systems and energy storage. In order to overcome the defects that the existing dust screen detection needs to additionally increase detection devices and can only detect the fixed heat consumption of equipment through temperature difference judgment, an aging experiment is carried out before the energy storage converter is shipped, an air volume flow reference value is obtained, and the energy storage converter reaches a heat balance state; a second altitude of a currently used place is set, the energy storage converter is stably operated at a certain power for a preset time length, and an air volume flow detection value at this time is calculated; a dust screen blockage reference value is calculated according to the air volume flow reference value and the air volume flow detection value; a dust screen blockage alarm threshold value is preset, and the blockage condition of the dust screen is judged according to the comparison result of the dust screen blockage reference value and the dust screen blockage alarm threshold value. The application is mainly used for detecting the blockage condition of the dust screen of the energy storage converter.

Description

Technical Field

[0001] This invention belongs to the field of energy storage in new energy power systems, and particularly relates to a method and system for detecting dust screens in energy storage converters. Background Technology

[0002] Installing dust filters at the ventilation openings of energy storage converters is a conventional dust prevention method. However, with prolonged use, these filters may gradually become clogged, reducing the converter's heat dissipation efficiency and potentially triggering overheating protection. Traditional methods involve regular manual inspections, increasing maintenance costs, or requiring maintenance after overheating protection activates, disrupting normal operation.

[0003] Intelligent detection typically involves adding deformation detection switches, laser emitters, light intensity sensors, and wind speed sensors, all of which require additional detection devices.

[0004] Intelligent detection can also make judgments based on temperature difference, but it can only detect situations where the heat consumption of the equipment is fixed, and cannot meet the detection requirements of different operating conditions of the energy storage converter.

[0005] Therefore, there is a need for a dustproof mesh detection method and system for energy storage converters that can solve the dustproof mesh detection problem under different operating conditions of energy storage converters based on the existing hardware of the energy storage converters. Summary of the Invention

[0006] To overcome the shortcomings of existing dustproof net detection methods, which require additional detection devices and can only detect fixed heat consumption of equipment based on temperature difference, this invention provides a dustproof net detection method and system for energy storage converters that can solve the dustproof net detection problem under different operating conditions of energy storage converters based on the existing hardware of the energy storage converter.

[0007] The dust filter detection method for an energy storage converter according to the present invention includes the following steps:

[0008] S1. Before the energy storage converter leaves the factory, an aging test is conducted to obtain a reference value for the air volume flow rate. This allows it to reach a state of thermal equilibrium.

[0009] S2, Set the second altitude of the current location. To ensure the energy storage converter operates stably at a certain power for a preset time, the air volume flow rate is calculated during this period. ;

[0010] S3. Based on the aforementioned air volume flow rate reference value air volume flow rate detection value Calculate the reference value X for dust screen clogging;

[0011] S4. Preset dust screen blockage alarm threshold A, and determine the blockage status of the dust screen based on the comparison between the dust screen blockage reference value X and the dust screen blockage alarm threshold A.

[0012] Further: In S1, the air volumetric flow rate reference value The calculation process is as follows:

[0013] S11. Record the initial values ​​of the experimental data; the initial values ​​include the first altitude. First heat generation First IGBT temperature First ambient temperature and the speed of the first fan ;

[0014] S12, Based on the first altitude Perform linear interpolation to calculate the first air density. ;

[0015] S13. Calculate the first AC power based on AC voltage / current. Calculate the first DC power based on DC voltage / current. According to the first AC power and first DC power Calculate the first power loss during charging and discharging respectively. ;

[0016] S14, Let the first heat output be... ; Calculate the reference value of air volumetric flow rate :

[0017] ;

[0018] in, Let the specific heat capacity of air be constant; It is the first air density.

[0019] Further: In S13, the first power loss The calculation process is as follows:

[0020] During charging: ;

[0021] During discharge: .

[0022] Further: In S2, the air volume flow rate detection value The calculation process is as follows:

[0023] S21. Manually input or remotely set the second altitude of the current location on the HMI. Update the air density ρ value;

[0024] S22. Set a preset time for the energy storage converter to operate stably at a certain power.

[0025] S23. Record the second data at the current moment, the second data including the second altitude. Second heat generation Second IGBT temperature Second ambient temperature Second fan speed ;

[0026] S24. Calculate real-time power loss ;

[0027] Let the second heat output be... ; Calculate the thermal equilibrium temperature ; ;

[0028] S25. Calculate the measured air volume flow rate at this time. ;

[0029] .

[0030] Further: In S3, the calculation process for the dustproof net clogging reference value X is as follows:

[0031] S31. Calculate the air volume flow rate ratio. The air volume flow rate ratio The calculation formula is:

[0032] ;

[0033] S32. Calculate the fan speed ratio The formula for calculating the fan speed ratio is:

[0034] ;in, The first fan speed, This refers to the second fan speed;

[0035] S33. When the heat dissipation conditions remain unchanged... When heat dissipation conditions change, the equation no longer holds true; taking X as a reference value for dust filter blockage, the calculation process is as follows: The smaller X is, the more severe the dust filter blockage.

[0036] Further: In S4, the specific steps for determining the blockage status of the dustproof net are as follows:

[0037] when When the dust filter is blocked, the DSP issues a dust filter blockage alarm signal, and the HMI displays the dust filter blockage alarm. After the DSP issues the dust filter blockage alarm, the dust removal fan is started during equipment shutdown.

[0038] The dustproof screen detection system for implementing the dustproof screen detection method for an energy storage converter, as described in this invention, includes a control board, an IGBT temperature sampling module, a fan speed feedback module, an ambient temperature sampling module, an AC voltage sampling module, an AC current sampling module, a DC voltage sampling module, a DC current sampling module, and an HMI; the IGBT temperature sampling module, the fan speed feedback module, the ambient temperature sampling module, the AC voltage sampling module, the AC current sampling module, the DC voltage sampling module, the DC current sampling module, and the HMI are all bidirectionally connected to the control board.

[0039] Furthermore, the control board includes a DSP chip with multi-channel AD sampling and a communication interface. The IGBT temperature sampling module, fan speed feedback module, ambient temperature sampling module, AC voltage sampling module, AC current sampling module, DC voltage sampling module, DC current sampling module and HMI are respectively connected to the DSP chip of the control board.

[0040] The beneficial effects of this invention are:

[0041] This invention enables the detection of dust screens without increasing the existing hardware of energy storage converters, avoiding manual inspections and reducing operation and maintenance costs; it also solves the problem that relying solely on temperature difference judgment cannot meet the dust screen detection requirements of different operating conditions of energy storage converters.

[0042] This invention utilizes existing sensor data within the energy storage converter, combined with equipment operating status and environmental parameters, to accurately determine the degree of blockage in the dust filter based on real-time data collection, and issues an early warning signal when an anomaly is detected. This method not only improves detection accuracy but also possesses strong adaptability, meeting the needs of the energy storage converter under different operating conditions. Furthermore, through analysis of historical data, the detection algorithm can be further optimized, improving the system's reliability and intelligence level. Attached Figure Description

[0043] Figure 1 A schematic diagram of a dustproof mesh detection system for an energy storage converter;

[0044] Figure 2 This is a flowchart illustrating the process of a dust filter detection method for an energy storage converter. Detailed Implementation

[0045] The following are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. The embodiments described below are only for explaining the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention should be determined by the scope of the claims. The embodiments of the present invention are described in detail below. In order to facilitate the description of the present invention and simplify the description, the technical terms used in the specification of the present invention should be interpreted broadly, including but not limited to conventional alternatives not mentioned in this application, and including both direct and indirect implementation methods.

[0046] Example 1

[0047] Combination Figure 1 and Figure 2 This embodiment describes a dust filter detection system for an energy storage converter, as shown in the attached diagram. Figure 1 The system includes a control board, an IGBT temperature sampling module, a fan speed feedback module, an ambient temperature sampling module, an AC voltage sampling module, an AC current sampling module, a DC voltage sampling module, a DC current sampling module, and an HMI (Human Machine Interface). The control board contains one DSP chip with multiple AD sampling channels and a communication interface. The IGBT temperature sampling module, fan speed feedback module, ambient temperature sampling module, AC voltage sampling module, AC current sampling module, DC voltage sampling module, DC current sampling module, and HMI are all connected to the DSP chip on the control board.

[0048] In practical applications, this system acquires key parameters of the energy storage converter in real time through various sampling modules. The DSP chip on the control board efficiently processes and analyzes this data, determining the status of the dust filter based on a preset algorithm. When the system detects that the dust filter is clogged to a certain extent, it promptly issues an alarm signal, reminding maintenance personnel to take appropriate measures. Simultaneously, activating the dust removal fan during equipment shutdown effectively clears some of the blockages, thereby extending the lifespan of the dust filter and ensuring the normal heat dissipation function of the energy storage converter. This detection scheme, based on existing hardware resources, not only improves detection efficiency but also reduces the risk of equipment failure due to dust filter clogging, providing strong support for the safe and stable operation of the energy storage converter.

[0049] Example 2

[0050] Combining Example 1 and Figure 2 This embodiment describes a method for detecting dust filters on an energy storage converter, as shown in the attached diagram. Figure 2 The workflow of the dust filter inspection method for energy storage converters is shown below:

[0051] Energy storage converters typically undergo aging tests before leaving the factory. The altitude at which the test reaches thermal equilibrium is recorded. First heat generation First IGBT temperature First ambient temperature and the speed of the first fan ; as a reference value for dustproof net testing.

[0052] Based on the altitude Ha of the aging test site, the air density was obtained by linear interpolation from the air density vs. altitude table, where the altitude range was located. Reference values.

[0053] Standard atmospheric conditions refer to an atmospheric state where the sea level temperature is 15℃, the sea level air pressure is 1013.25 hPa, and the relative humidity is 0%. Table 1 shows the air density and air density altitude data corresponding to different altitudes under standard atmospheric conditions. The data has been professionally calculated and can serve as a basic reference for various related fields.

[0054] Table 1: Air Density vs. Altitude

[0055]

[0056] The DSP (Digital Signal Processing) chip calculates the AC power based on the AC voltage and AC current of the energy storage converter during aging tests. Calculating DC power using DC voltage and DC current .

[0057] AC power during charging Greater than DC power Power loss The calculation formula is: ;

[0058] DC power during discharge Greater than AC power Power loss The calculation formula is: .

[0059] The power loss of an energy storage converter is primarily heat loss, and the heat generated is... Approximately equal to power loss ,set up .

[0060] According to formula Q Where Q is the equipment heat consumption, ρ is the air density, and V is the air volumetric flow rate. It is the specific heat capacity of air. It's the IGBT temperature. It refers to the ambient temperature.

[0061] The formula for calculating air volumetric flow rate V can be obtained: V ;

[0062] The relative change is small, so it can be set as a fixed constant.

[0063] Reference values ​​for calculating air volume flow rate during aging tests .

[0064] After the energy storage converter arrives at the site, if the location of use changes, the altitude parameter needs to be manually updated in HMI9. Alternatively, you can remotely connect to the HMI for remote settings.

[0065] Thermal equilibrium of the energy storage converter typically requires 4 hours, but on-site operating conditions may not always meet the requirements. Therefore, for ease of testing, based on engineering experience, the temperature of the second IGBT is recorded after 30 minutes of constant power operation. Calculate the temperature of the second IGBT at thermal equilibrium. , , These are engineering experience values, and are usually taken within 10℃.

[0066] Simultaneously record the second heat generation at this time. Second IGBT temperature Second ambient temperature Second fan speed ; Calculate the measured air volume flow rate at this time. .

[0067] ;

[0068] Calculate the air volume flow rate ratio ;

[0069] Calculate the fan speed ratio .

[0070] When the heat dissipation conditions remain unchanged When the heat dissipation conditions change, the equation no longer holds true.

[0071] Using X as a reference value for dust screen clogging, the calculation process is as follows: The smaller X is, the more severe the dust filter blockage.

[0072] The preset dust filter blockage alarm threshold A is when... When the dust filter is blocked, the DSP issues a dust filter blockage alarm signal, and the HMI displays the dust filter blockage alarm. After the DSP issues the dust filter blockage alarm, the dust removal fan can be started during equipment downtime.

Claims

1. A dust screen detection method for an energy storage converter, characterized by, Comprising the following steps: S1, before the energy storage converter leaves the factory, an aging experiment is performed to obtain an air volume flow reference value to reach a thermal equilibrium state; In S1, the air volume flow reference value The calculation process is as follows: S11, recording initial values of experimental data; the initial values include a first altitude , a first heat generation , a first IGBT temperature , a first ambient temperature , and a first fan rotation speed ; S12、according to the first altitude linear interpolation is performed to calculate the first air density ; S13. Calculate first AC power from AC voltage / current S14. Calculate first DC power from DC voltage / current S15. Calculate first power loss during charging / discharging from first AC power and first DC power S16. Calculate first power loss during charging / discharging from first AC power and first DC power S14, set the first heat quantity ; Computing an air volume flow reference value : ； wherein, Cp is the specific heat of air, taken as constant; is the first air density; S2, set the second altitude of the current use place Make the energy storage converter run stably at a certain power for a preset time length, and calculate the air volume flow detection value at this time ; In S2, the air volume flow detection value The calculation process is as follows: S21, manually input or remotely set the second altitude of the current use site on the HMI , update the air density p value; S22, make the energy storage converter stable operation for a preset time length under a certain power; S23, record second data of current time, the second data including second altitude , second heat generation , second IGBT temperature , second ambient temperature , second fan rotating speed ; S24, calculate real-time power loss ; Let the second heat generation ; estimate the thermal equilibrium temperature ; ; is the engineering experience value; S25, calculate the air volume flow detection value at this time ; ； S3. calculating a dust screen clogging reference value X based on the air volume flow reference value with the air volume flow detection value , calculating a dust screen clogging reference value X; In S3, the calculation process of the dust screen blockage reference value X is: S31、calculating an air volume flow ratio , the air volume flow ratio The calculation formula is: ； S32, calculate a fan speed ratio The formula for calculating the fan speed ratio is: ; wherein, is a first fan speed, is a second fan speed; S33, when the heat dissipation condition is unchanged, When the heat dissipation condition changes, the equation is not established; X is taken as the dust screen blockage reference value, and the calculation process is as follows: The smaller X is, the more serious the dust screen blockage is. S4, preset the dust screen blockage alarm threshold A, and judge the blockage condition of the dust screen according to the comparison result of the dust screen blockage reference value X and the dust screen blockage alarm threshold A.

2. The dust screen detection method of an energy storage inverter according to claim 1, characterized in that, In S13, the first power loss is calculated as follows: Charging time: ; At discharge: .

3. The dust screen detection method of an energy storage inverter according to claim 1, characterized in that, In S4, the specific steps of judging the blockage condition of the dust screen are: When the dust screen is blocked, the DSP sends a dust screen blockage alarm signal, and the HMI displays a dust screen blockage alarm; after the DSP sends the dust screen blockage alarm, the dust removal fan is started during shutdown of the device.

4. A dust screen detection system for implementing a dust screen detection method of an energy storage converter as claimed in any one of claims 1-3, characterized in that, The control panel, IGBT temperature sampling module, fan speed feedback module, environmental temperature sampling module, AC voltage sampling module, AC current sampling module, DC voltage sampling module, DC current sampling module and HMI; the IGBT temperature sampling module, fan speed feedback module, environmental temperature sampling module, AC voltage sampling module, AC current sampling module, DC voltage sampling module, DC current sampling module and HMI are in bidirectional communication with the control panel.

5. The dust screen detection system of claim 4, wherein The control panel includes a DSP chip with multi-channel AD sampling and a communication interface, and the IGBT temperature sampling module, fan speed feedback module, environmental temperature sampling module, AC voltage sampling module, AC current sampling module, DC voltage sampling module, DC current sampling module and HMI are in communication with the DSP chip of the control panel.

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