Dust screen detection method and detection system for energy storage converter

Abstract

The invention discloses a dust screen detection method and detection system for an energy storage converter, and belongs to the field of energy storage of new energy power systems. In order to overcome the defects that a detection device needs to be additionally arranged for existing dustproof net detection, and only fixed heat consumption of equipment can be detected through temperature difference judgment, an aging experiment is carried out before an energy storage converter leaves a factory, and an air volume flow reference value is obtained to enable the energy storage converter to reach a heat balance state; setting a second altitude of the current use place, enabling the energy storage converter to stably operate for a preset time length under a certain power, and calculating an air volume flow detection value at the moment; calculating a dust screen blockage reference value according to the air volume flow reference value and the air volume flow detection value; and presetting a dust screen blockage alarm threshold value, and judging the blockage condition of the dust screen according to a comparison result of the dust screen blockage reference value and the dust screen blockage alarm threshold value. The method is mainly used for detecting the blockage condition of the dust screen of the energy storage converter.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of new energy power system energy storage, and particularly relates to a dust screen detection method and system for an energy storage converter. BACKGROUND

[0002] Installing a dust screen at the air vent of an energy storage converter is a conventional dust prevention method. With long-time use of the equipment, the dust screen may gradually clog, causing the heat dissipation effect of the energy storage converter to decrease or even overheat protection. The traditional method is manual regular inspection, which increases operation and maintenance costs, or maintenance after overheat protection of the equipment, which affects normal use of the equipment.

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

[0004] Intelligent detection also involves temperature difference judgment, but it can only detect fixed equipment heat consumption and cannot meet the detection of different operating conditions of the energy storage converter.

[0005] Therefore, a dust screen detection method and system for an energy storage converter is needed to solve the problem of dust screen detection under different operating conditions of the energy storage converter based on the existing hardware of the energy storage converter. SUMMARY

[0006] The application provides a dust screen detection method and system for an energy storage converter to solve the problem of dust screen detection under different operating conditions of the energy storage converter based on the existing hardware of the energy storage converter, to overcome the defects of the prior art that additional detection devices are needed for dust screen detection, and that temperature difference judgment can only detect fixed equipment heat consumption.

[0007] The dust screen detection method for an energy storage converter provided by the application comprises the following steps: S1. Before the energy storage converter is shipped, an aging experiment is performed to obtain an air volume flow reference value , so that the energy storage converter reaches a thermal equilibrium state; S2. A second altitude of the current use location 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 ; S3. A dust screen clogging reference value X is calculated according to the air volume flow reference value and the air volume flow detection value ; S4. A dust screen clogging alarm threshold A is preset, and the clogging condition of the dust screen is judged according to the comparison result of the dust screen clogging reference value X and the dust screen clogging alarm threshold A.

[0008] Further: In S1, the air volumetric flow rate reference value The calculation process is as follows: 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 ; S12, Based on the first altitude Perform linear interpolation to calculate the first air density. ; 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. ; S14, Let the first calorific value be... ; Calculate the reference value of air volumetric flow rate : ; in, Let the specific heat capacity of air be constant; It is the first air density.

[0009] Further: In S13, the first power loss The calculation process is as follows: During charging: ; During discharge: .

[0010] Further: In S2, the air volume flow rate detection value The calculation process is as follows: S21. Manually input or remotely set the second altitude of the current location on the HMI. Update the air density ρ value; S22. Set a preset time for the energy storage converter to operate stably at a certain power. 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 ; S24, calculate real-time power loss ; Set the second heat quantity ; estimate the heat balance temperature ; ; S25, calculate the air volume flow detection value at this time ; .

[0011] Further: in S3, the calculation process of the dust screen blockage reference value X is: S31, calculate the air volume flow ratio , the calculation formula of the air volume flow ratio ; S32, calculate the fan speed ratio , the calculation formula of the fan speed ratio is: ; wherein, is the first fan speed, is the second fan speed; S33, when the heat dissipation condition is unchanged, ; when the heat dissipation condition changes, the equation is not established; take X as the dust screen blockage reference value, and the calculation process is: , the smaller X is, the more serious the dust screen blockage is.

[0012] Further: in S4, the specific steps for judging the blockage of the dust screen are: When , 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 the equipment shutdown.

[0013] The dust screen detection system for realizing the dust screen detection method of the energy storage converter provided by the application comprises a control panel, an IGBT temperature sampling module, a fan speed feedback module, an environment temperature sampling module, an alternating current voltage sampling module, an alternating current current sampling module, a direct current voltage sampling module, a direct current current sampling module and an HMI; the IGBT temperature sampling module, the fan speed feedback module, the environment temperature sampling module, the alternating current voltage sampling module, the alternating current current sampling module, the direct current voltage sampling module, the direct current current sampling module and the HMI are in bidirectional communication with the control panel.

[0014] ​Further, the control board comprises a DSP chip with multi-channel AD sampling and a communication interface, and the IGBT temperature sampling module, the fan rotation speed feedback module, the environmental 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 in communication with the DSP chip of the control board.

[0015] The present application has the following advantages: The present application can detect the dust screen without increasing the existing energy storage converter hardware, avoid manual inspection, reduce operation and maintenance costs, and solve the problem that the dust screen detection cannot meet the different operating conditions of the energy storage converter by relying only on temperature difference.

[0016] The present application uses the existing sensor data inside the energy storage converter, combines the equipment operating state and environmental parameters, accurately judges the degree of dust screen blockage according to real-time collected data, and sends a warning signal when an abnormality is detected. This method not only improves the accuracy of detection, but also has strong adaptability and can meet the needs of the energy storage converter under different operating conditions. In addition, through analysis of historical data, the detection algorithm can be further optimized to improve the reliability and intelligence level of the system. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of a dust screen detection system for an energy storage converter; Figure 2 is a workflow diagram of a dust screen detection method for an energy storage converter. DETAILED DESCRIPTION

[0018] The following is only a preferred embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application. The following examples are only used to explain the present application and cannot be interpreted as limiting the present application. The protection scope of the present application should be based on the protection scope of the claims. The embodiments of the present application are described in detail below. In order to facilitate the description of the present application and simplify the description, the technical terms used in the specification of the present application should be interpreted broadly, including but not limited to conventional replacement schemes not mentioned in the present application, and including direct implementation and indirect implementation.

[0019] Example 1 In combination Figure 1 and Figure 2 This embodiment discloses a dust screen detection system for an energy storage converter, as shown in the accompanying Figure 1The 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.

[0020] 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.

[0021] Example 2 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: 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 dust control net testing.

[0022] 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.

[0023] Standard atmospheric conditions refer to the atmospheric state that the sea level temperature is 15 DEG C, the sea level pressure is 1013.25 hPa (hundred pascal), and the relative humidity of air is 0%. As shown in Table 1, the air density and air density height data corresponding to different altitudes in the standard atmospheric conditions are presented, and the data are calculated by professionals and can be used as a basis for reference in various related fields.

[0024] Table 1: Air density and altitude table

[0025] The DSP (Digital Signal Processing, digital signal processing chip) calculates the AC power according to the AC voltage and AC current of the energy storage converter during the aging experiment , the DC voltage and the DC current calculate the DC power .

[0026] During charging, the AC power is greater than the DC power , and the power loss is calculated by the formula: ; During discharging, the DC power is greater than the AC power , and the power loss is calculated by the formula: .

[0027] The power loss of the energy storage converter is basically the heat consumption, and the heat generation is approximately equal to the power loss , and let .

[0028] According to the formula Q , wherein Q is the heat consumption of the device, p is the air density, V is the air volume flow, is the specific heat capacity of air, is the IGBT temperature, is the ambient temperature.

[0029] The calculation formula of the air volume flow V can be obtained: V ; The relative change is relatively small, and can be set as a fixed constant.

[0030] The reference value of the air volume flow during the aging experiment is calculated .

[0031] After the energy storage converter reaches the use site, when the use location changes, the altitude parameter needs to be manually updated in the HMI 9 , or the HMI can be remotely connected for remote setting.

[0032] The thermal equilibrium of the energy storage converter usually needs 4 hours, but the working condition of the site may not be able to meet the requirements every time, so for detection, reference engineering experience is recorded at the second IGBT temperature at 30 min of constant power operation , the second IGBT temperature at thermal equilibrium is calculated , , It is an engineering experience value, usually within 10℃.

[0033] At the same time, record the second heat generation at this time , the second IGBT temperature , the second ambient temperature , the second fan speed ; calculate the air volume flow detection value at this time .

[0034] ; Calculate the air volume flow ratio ; Calculate the fan speed ratio .

[0035] When the heat dissipation condition is unchanged, When the heat dissipation condition changes, the equation is not established.

[0036] Take X as the dust screen blockage reference value, and the calculation process is: The smaller X is, the more serious the dust screen blockage is.

[0037] Pre-set dust screen blockage alarm threshold A, when , the DSP sends a dust screen blockage alarm signal, and the HMI displays a dust screen blockage alarm. After the DSP sends a dust screen 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, Comprise 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; 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 ; 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; S4, preset dust screen blockage alarm threshold A, according to the comparison result of dust screen blockage reference value X and dust screen blockage alarm threshold A to judge the blockage condition of dust screen.

2. The dust screen detection method of an energy storage inverter according to claim 1, characterized in that, 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, calculating a first AC power from the AC voltage / current S14, calculating a first DC power from the DC voltage / current S15, calculating a first power loss during charging / discharging from the first AC power and the first DC power respectively ; 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.

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

4. The dust screen detection method of an energy storage inverter according to claim 1, characterized in that, 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 ; ; S25, calculate the air volume flow detection value at this time ; 。 5. The dust screen detection method of an energy storage inverter according to claim 1, wherein, 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.

6. The dust screen detection method of an energy storage inverter according to claim 1, wherein, 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.

7. A dust screen detection system for implementing a dust screen detection method of an energy storage converter as claimed in any one of claims 1-6, characterized in that, It comprises a control panel, an IGBT temperature sampling module, a fan speed feedback module, an environmental temperature sampling module, an alternating current voltage sampling module, an alternating current current sampling module, a direct current voltage sampling module, a direct current current sampling module and an HMI; the IGBT temperature sampling module, the fan speed feedback module, the environmental temperature sampling module, the alternating current voltage sampling module, the alternating current current sampling module, the direct current voltage sampling module, the direct current current sampling module and the HMI are in bidirectional communication with the control panel.

8. The dust screen detection system of claim 7, wherein The control panel comprises a DSP chip with multi-channel AD sampling and a communication interface, and the IGBT temperature sampling module, the fan speed feedback module, the environmental temperature sampling module, the alternating current voltage sampling module, the alternating current current sampling module, the direct current voltage sampling module, the direct current current sampling module and the HMI are in communication with the DSP chip of the control panel.

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