Carbon footprint evaluation method for operation loss of frequency converter cabinet

Abstract

The invention discloses a carbon footprint evaluation method for operation loss of a frequency converter cabinet, and belongs to the technical field of carbon emission measurement. The method comprises the following steps: S1, calculating the operation loss of each component device in a frequency converter cabinet, wherein the device comprises a frequency converter, an input filter, an output reactor, a connecting conductor, a protective circuit breaker, a switch device, an in-cabinet cooling and ventilating device and a control loop; s2, based on a preset regional power grid carbon emission factor, converting the operation loss value of each device calculated in the step S1 into a carbon dioxide emission equivalent; s3, judging whether other associated equipment which is not calculated exists or not, and if so, returning to S1 to continue calculation; otherwise, executing S4; and S4, accumulating the carbon dioxide emission equivalents of all equipment, and outputting the overall carbon footprint data of the frequency converter cabinet. According to the method, the overall carbon emission level of the frequency converter cabinet can be reflected more comprehensively and accurately, and the influence of the frequency converter cabinet on the environment can be visually reflected.

Description

Technical Field

[0001] This application relates to the technical field of carbon emission measurement, and specifically relates to a method for evaluating the carbon footprint of the operating losses of a frequency converter cabinet. Background Art

[0002] With the rapid development of social economy and the continuous enhancement of people's environmental protection awareness, carbon emission measurement technology has been widely applied in various industries. As an indispensable device in industrial production, the energy consumption and carbon emission problems during the operation of the frequency converter cabinet have attracted increasing attention.

[0003] In the prior art, there are certain defects in the method for calculating the carbon footprint of the operating losses of the frequency converter cabinet. Usually, only the operating losses of the frequency converter itself are considered, while the energy losses of other devices in the cabinet such as input filters, output reactors, connecting conductors, protective circuit breakers, switchgear, cooling and ventilation devices, and control circuits are ignored, resulting in a deviation between the calculation result and the actual situation and being unable to accurately reflect the overall carbon emission level of the frequency converter cabinet. Moreover, when calculating the operating losses of the above various devices in the prior art, more relevant parameters and factors are not considered, and there is no loss verification step for the total operating losses, thus there are problems of insufficient evaluation accuracy and reliability.

[0004] In addition, the existing methods only calculate the electrical energy losses and do not convert them into carbon dioxide equivalents, so it is impossible to intuitively reflect the impact of the frequency converter cabinet on the environment. Therefore, there is an urgent need for a comprehensive and accurate method for evaluating the carbon footprint of the operating losses of the frequency converter cabinet to guide enterprises in formulating emission reduction strategies and promoting green and low-carbon development. Summary of the Invention

[0005] Therefore, in view of the problems and needs existing in the above prior art, this application is proposed. The purpose of this application is to provide a method for evaluating the carbon footprint of the operating losses of a frequency converter cabinet, which can more comprehensively and accurately reflect the overall carbon emission level of the frequency converter cabinet compared with the defects of the prior art and can intuitively reflect the impact of the frequency converter cabinet on the environment.

[0006] The purpose of this application is achieved through the following technical solutions:

[0007] An embodiment of this application provides a method for evaluating the carbon footprint of the operating losses of a frequency converter cabinet, including the following steps:

[0008] S1. Calculate the operating losses of each component device in the frequency converter cabinet, and the devices include a frequency converter, an input filter, an output reactor, a connecting conductor, a protective circuit breaker, switchgear, a cooling and ventilation device inside the cabinet, and a control circuit;

[0009] S2. Based on the preset carbon emission factor of the regional power grid, convert the operating loss values of each device calculated in S1 into carbon dioxide emission equivalents;

[0010] S3. Determine whether there are other associated devices that have not been calculated. If so, return to S1 to continue the calculation; otherwise, execute S4;

[0011] S4. Accumulate the carbon dioxide emission equivalents of all devices and output the carbon footprint data of the entire frequency converter cabinet.

[0012] In the above carbon footprint assessment method for the operating losses of the frequency converter cabinet, in S1, the calculation of the operating losses of the frequency converter adopts a dynamic efficiency model, and the specific formula is as follows:

[0013]

[0014] Among them, Ploss is the operating loss of the frequency converter, Uout is the output voltage, Iout is the output current, is the output power factor, η is the efficiency of the frequency converter, and η is determined by interpolation according to the load rate - efficiency curve.

[0015] In the above carbon footprint assessment method for the operating losses of the frequency converter cabinet, in S1, the calculation of the input filter losses includes a harmonic compensation factor, and the specific formula is as follows:

[0016]

[0017] Among them, Iin is the effective value of the input - side current, RL is the resistance of the inductor winding, RC is the equivalent resistance of the capacitor, DFCu is the dynamic correction coefficient of copper loss (harmonic compensation factor) determined based on the current harmonic distortion rate (THDi), DFFe is the iron - loss harmonic compensation factor, and PFe is the core loss under the fundamental - wave condition.

[0018] In the above carbon footprint assessment method for the operating losses of the frequency converter cabinet, in S1, the calculation of the output reactor losses, the specific formula is:

[0019]

[0020] Among them, Rcoil is the resistance of the output reactor winding, and Ireactor is the effective value of the output - side current.

[0021] In the above carbon footprint assessment method for the operating losses of the frequency converter cabinet, in S1, the calculation of the operating losses of the connecting conductor, the specific formula is as follows:

[0022]

[0023] Among them, n is the number of conductor phases, Rac is the alternating - current resistance of the conductor, and the skin effect and proximity effect corrections are made to the conductor resistance value using an alternating - current resistance correction model. The specific formula is:

[0024] Rac = Rdc×(1 + ys + yp)

[0025] Among them, Rdc is the direct current resistance of the conductor, ys is the skin effect coefficient, and yp is the proximity effect coefficient.

[0026] In the above carbon footprint assessment method for the operating losses of the frequency converter cabinet, the calculation of the operating losses of the output reactor and the connecting conductor also includes a temperature compensation step to correct the resistance value for the ambient temperature. Specifically:

[0027] Rcorrected = R0 × [1 + α × (Tamb - 20)]

[0028] Among them, R0 is the direct current resistance of the conductor at 20°C, α is the material temperature coefficient, and Tamb is the operating temperature of the conductor.

[0029] In the above carbon footprint assessment method for the operating losses of the frequency converter cabinet, the calculation of the operating losses of the switchgear in S1 is specifically as follows:

[0030]

[0031] Among them, Irated is the rated current, Rcontact is the contact resistance, and Iload is the load current.

[0032] In the above carbon footprint assessment method for the operating losses of the frequency converter cabinet, for the operating losses of the frequency converter in S1, the dynamic load is processed by the piecewise integration method. Specifically:

[0033]

[0034] Among them, P(ti) is the average power loss in the i-th time period, Δti is the length of the time interval, taking an interval of 5 - 30 minutes to correspond to the real-time data acquisition period of the SCADA system; n is the total number of time periods.

[0035] In the above carbon footprint assessment method for the operating losses of the frequency converter cabinet, step S4 also includes verifying the total loss value through the thermodynamic equilibrium equation. Specifically:

[0036]

[0037] Among them, Qvent is the air volume of the ventilation system, ρ is the air density, cp is the specific heat capacity at constant pressure of air, ΔT is the temperature difference inside and outside the cabinet, ∑PtotalLoss is the total operating loss of the frequency converter cabinet, and the allowable error range between the two is ±5%. When the range is exceeded, a review mechanism is triggered.

[0038] Compared with the prior art, the beneficial effects of the present invention are at least as follows:

[0039] The carbon footprint assessment method for the operating losses of the frequency converter cabinet in this application calculates the operating loss data of each component device in the frequency converter cabinet separately, then converts it into carbon dioxide emission equivalents based on the carbon emission factors of the regional power grid, and then obtains the annual and life-cycle carbon footprint data of the entire frequency converter cabinet based on the annual operating time and estimated service life of the frequency converter cabinet, which can more comprehensively and accurately reflect the overall carbon emission level of the frequency converter cabinet and can intuitively reflect the impact of the frequency converter cabinet on the environment. Among them, for the operating losses of each component device, such as the dynamic efficiency model is adopted for the frequency converter body, the influence of harmonics on its losses is considered for the input filter and output reactor, and the calculation results are corrected by using the harmonic compensation factor. For the connecting conductor, the skin effect, proximity effect and temperature are considered, and the corresponding correction factors are used for correction, so that the calculation results are more accurate.

[0040] The piecewise integration method in this application effectively balances the calculation accuracy and resource consumption by decomposing the dynamic load into multiple static time periods. Combining with the real-time data of the SCADA system, it can accurately reflect the energy consumption characteristics of the frequency converter cabinet under different working conditions, provide a reliable basis for carbon footprint calculation, and make the calculation results more accurate.

[0041] This application verifies the total loss value through the thermodynamic equilibrium equation, can effectively identify calculation model deviations or equipment abnormalities, and ensure the accuracy and reliability of the carbon footprint data. Brief Description of the Drawings

[0042] By describing the embodiments of this application in more detail with reference to the drawings, the above and other objects, features and advantages of this application will become more obvious. The drawings are used to provide a further understanding of the embodiments of this application, and constitute a part of the specification. Together with the embodiments of this application, they are used to explain this application and do not constitute a limitation to this application.

[0043] Figure 1 It is a flowchart of a carbon footprint assessment method for the operating losses of a frequency converter cabinet provided by an embodiment of this application. Detailed Embodiments

[0044] Next, exemplary embodiments according to this application will be described in detail with reference to the drawings. It should be understood that the specific embodiments described herein are only a part of the embodiments of this application, and this application is not limited by the exemplary embodiments described herein.

[0045] Embodiment 1

[0046] As Figure 1 shown, the embodiment of this application provides a carbon footprint assessment method for the operating losses of a frequency converter cabinet, including steps S1-S4.

[0047] In step S1, the operating losses of each component device in the frequency converter cabinet are calculated. The devices include a frequency converter, an input filter, an output reactor, connecting conductors, a protective circuit breaker, switchgear, a cabinet cooling and ventilation device, and a control circuit.

[0048] Specifically, the inventors found that in the prior art, there are certain defects in the calculation method of the carbon footprint of the operating losses of the frequency converter cabinet. Usually, only the operating losses of the frequency converter itself are considered, while the energy losses of other devices in the cabinet such as the input filter, output reactor, connecting conductors, protective circuit breaker, switchgear, cooling and ventilation device, and control circuit are ignored, resulting in a deviation between the calculation result and the actual situation and being unable to accurately reflect the overall carbon emission level of the frequency converter cabinet. To solve this technical problem, the inventors proposed a processing method, that is, to calculate the operating losses of each component device in the frequency converter cabinet separately in this step, so as to achieve the purpose of more comprehensively and accurately reflecting the overall carbon emission level of the frequency converter cabinet.

[0049] For the operating losses of the frequency converter body, a simplified model that only considers conduction losses as the main factor can be used for calculation. The single-phase conduction loss is calculated from the conduction voltage drop Vce and the output current Iout, and then the total three-phase conduction loss is calculated. The specific formula is:

[0050] Ptotal_loss = 3 × Iout × Vce

[0051] The above simplified model ignores switching losses, DC bus capacitor losses, and drive circuit losses. Preferably, in the embodiments of the present application, in order to calculate the operating losses of the frequency converter body more comprehensively, a dynamic efficiency model is adopted. The specific formula is as follows:

[0052]

[0053] Among them, Ploss is the operating loss of the frequency converter, Uout is the output voltage, Iout is the output current, is the output power factor, η is the efficiency of the frequency converter, and η is determined by dynamically calculating the load rate of the frequency converter and interpolating based on the load rate - efficiency curve provided by the manufacturer to achieve a more accurate calculation effect.

[0054] The input filter usually consists of a reactor (inductor) and a capacitor. Its operating losses mainly include reactor losses and capacitor losses. To solve the additional losses caused by harmonics, preferably, the calculation of the input filter losses in the present application includes a harmonic compensation factor. The specific formula is as follows:

[0055]

[0056] Among them, Iin is the effective value of the input - side current (harmonic current, phase current), RL is the resistance of the inductor winding, RC is the equivalent resistance of the capacitor, DFCu is the dynamic correction coefficient of copper loss (harmonic compensation factor) determined based on the total harmonic distortion rate of current (THDi), DFFe is the harmonic compensation factor of iron loss, and PFe is the core loss under the fundamental - wave condition.

[0057] Among them, the relationship between DFCu and THDi can be expressed as:

[0058]

[0059] Among them, THDi is the total harmonic distortion rate of current, k is the harmonic loss proportion coefficient, usually taking 0.2 - 0.5;

[0060] THDi_ref is the reference harmonic distortion rate, n is the non - linear index, usually taking 1 - 2; when THDi is in the range of 10% - 30%, a linear model can be used for simplified calculation.

[0061] For the iron loss PFe, it can be calculated according to the theoretical formula based on the Steinmetz equation or according to the engineering simplified method based on the iron loss per unit weight under the reference condition provided by the manufacturer. DFFe can be calculated by the following formula:

[0062]

[0063] Among them, Ih is the effective value of the h - th harmonic current, fh is the frequency of the h - th harmonic, I1 is the effective value of the fundamental - wave current, and n is the highest harmonic order considered (usually taking 40 or 50).

[0064] The loss of the output reactor includes two parts: coil resistance loss (copper loss) and core loss (iron loss). At power frequency (50 / 60 Hz) and with a low harmonic content (THDi < 30%), the iron loss can be ignored. At this time, its calculation formula is:

[0065]

[0066] Among them, Rcoil is the resistance of the output - reactor winding, Ireactor is the effective value of the output - side current (harmonic current, phase current); for high - frequency or high - harmonic (power frequency > 1 kHz or THDi > 50%) scenarios, the proportion of iron loss can reach more than 5%. At this time, the iron loss needs to be calculated. Specifically, the iron - loss calculation method in the above - mentioned input - filter part can be used for specific calculation.

[0067] For the operating loss of the connecting conductor, its specific formula is as follows:

[0068]

[0069] Among them, n is the number of conductor phases, and Rac is the AC resistance of the conductor;

[0070] Preferably, an AC resistance correction model is used to correct the skin effect and proximity effect of the conductor resistance value. The specific formula is:

[0071] Rac = Rdc × (1 + ys + yp)

[0072] Among them, Rdc is the DC resistance of the conductor, ys is the skin effect coefficient, and yp is the proximity effect coefficient;

[0073] Rdc can be calculated using the conductor resistance calculation formula based on the conductor resistivity, length, and cross-sectional area. Among them, the conductor resistivity is the resistivity of the conductor material at 20°C;

[0074] For ys, in the case of a circular conductor, a simplified formula of the IEC60287 standard is used for calculation. Specifically:

[0075] (Applicable to x ≤ 2.8)

[0076] Among them, x can be calculated using the following formula:

[0077]

[0078] Among them, f is the operating frequency, μ0 is the magnetic permeability of vacuum, and Rd is the DC resistance per unit length;

[0079] For yp, the formula of the IEC60827-1-3 standard can be used for calculation. Specifically:

[0080]

[0081] Among them, di is the conductor diameter, and sij is the conductor spacing.

[0082] Preferably, the inventor considered that the increase in temperature would cause an increase in the conductor resistance. Therefore, when calculating the operating losses of the output reactor and the connecting conductor, a temperature compensation step is also included to correct the resistance value for the ambient temperature. Specifically:

[0083] Rcorrected = R0 × [1 + α × (Tamb - 20)]

[0084] Among them, R0 is the DC resistance of the conductor at 20°C, α is the material temperature coefficient, and Tamb is the operating temperature of the conductor.

[0085] For the operating losses of the protection circuit breaker, it is mainly dominated by the joule heat of the contact resistance. The calculation formula is:

[0086]

[0087] Among them, I rated is the rated current of the protective circuit breaker, and R total is the total contact resistance of the circuit breaker. For example, the total contact resistance of a three-phase circuit breaker is 3 times that of a single pole.

[0088] For the operating losses of switchgear, they are mainly dominated by the joule heat of the contact resistance and are calculated by the following formula:

[0089]

[0090] Among them, I rated is the rated current, R contact is the contact resistance, and I load is the load current.

[0091] For the cooling and ventilation device, its operating losses can use its total input electric power as the loss data, that is, its rated power.

[0092] The operating losses of the control circuit, including the total input power of all components in the control circuit (such as power modules, controllers, relays, sensors, etc.), can obtain their power consumption data based on the specific models of the components, then calculate their total power consumption based on the quantity of a certain component, and then accumulate the power consumption of all components as the operating losses of the control circuit. Only the loss part of the power consumption of the power module is calculated.

[0093] In step S2, based on the preset carbon emission factor of the regional power grid, convert the operating loss values of each device calculated in S1 into carbon dioxide emission equivalents.

[0094] Specifically, the system pre-stores the carbon emission factors of each regional power grid, and its data comes from the data published by the Ministry of Ecology and Environment. For example, the country is divided into regions such as North China, East China, and Southwest, corresponding to the average carbon dioxide emission factors of electricity in each region, and also including the average carbon dioxide emission factors of provincial electricity; the carbon emission factors of the regional or provincial power grid can be selected to convert the operating losses calculated for each device in step S1 into carbon dioxide emission equivalents.

[0095] In step S3, determine whether there are other associated devices that have not been calculated. If so, return to S1 to continue the calculation; otherwise, execute S4.

[0096] Specifically, determine whether there are other devices in the frequency converter cabinet other than the components included in step S1. If so, it is necessary to return to step S1 to calculate its operating loss data according to the specific model of the device; if not, enter the next step S4.

[0097] In step S4, accumulate the carbon dioxide emission equivalents of all devices and output the carbon footprint data of the entire frequency converter cabinet.

[0098] Specifically, the hourly carbon dioxide emission equivalent of the entire frequency converter cabinet can be obtained by accumulating the carbon dioxide emission equivalents of the devices in S1-S3 above, and then the annual and life-cycle carbon footprint data of the entire frequency converter cabinet can be obtained based on the annual operating hours and estimated service life of the frequency converter cabinet.

[0099] In the method of this embodiment, by separately calculating the operation loss data of each component device in the frequency converter cabinet, converting it into carbon dioxide emission equivalent based on the carbon emission factor of the regional power grid, and then obtaining the annual and life-cycle carbon footprint data of the entire frequency converter cabinet based on the annual operating hours and estimated service life of the frequency converter cabinet, it can more comprehensively and accurately reflect the carbon emission level of the entire frequency converter cabinet, and can intuitively reflect the impact of the frequency converter cabinet on the environment. Among them, for the operation loss of each component device, such as the dynamic efficiency model is adopted for the frequency converter body, the influence of harmonics on its loss is considered for the input filter and output reactor, and the calculation result is corrected by using the harmonic compensation factor. For the connecting conductor, the skin effect, proximity effect and temperature are considered, and the corresponding correction coefficient is used for correction, so that the calculation result is more accurate.

[0100] Embodiment 2

[0101] Preferably, considering the characteristic that the load power of the frequency converter changes with time, in order to calculate its operation loss more accurately, the piecewise integration method is used to process the dynamic load. Specifically:

[0102]

[0103] Among them, P(ti) is the average power loss in the i-th time period, Δti is the time interval length, taking an interval of 5-30 minutes to correspond to the real-time data acquisition period of the SCADA system to ensure data synchronization; n is the total number of time periods.

[0104] Specifically, the continuous operation time of the frequency converter is divided into multiple time periods, such as Δti = 15 minutes. For each time period i, calculate the average power loss per unit time of the frequency converter in this time period, then multiply by the time interval to obtain the power loss of time period i, and then accumulate the power losses of all time periods to obtain the total power loss. Among them, P(ti) can be calculated by the average power method or the trapezoidal integration method or the real-time interpolation method.

[0105] The piecewise integration method of this embodiment effectively balances the calculation accuracy and resource consumption by decomposing the dynamic load into multiple static time periods. Combining with the real-time data of the SCADA system, it can accurately reflect the energy consumption characteristics of the frequency converter cabinet under different working conditions, provide a reliable basis for carbon footprint calculation, and make the calculation result more accurate.

[0106] Embodiment 3

[0107] Preferably, step S4 further includes verifying the total loss value through a thermodynamic equilibrium equation, specifically:

[0108]

[0109] Where Qvent is the air volume of the ventilation system, ρ is the air density, cp is the specific heat capacity of air at constant pressure, ΔT is the temperature difference inside and outside the cabinet, and ∑PtotalLoss is the total operating loss of the frequency converter cabinet (the total losses of each component device accumulated in steps S1 - S3). The allowable error range between the two is ±5%. When the range is exceeded, a review mechanism is triggered.

[0110] Specifically, based on the law of conservation of energy, the total heat generated by all devices in the cabinet (total operating loss) should be equal to the heat carried away by the ventilation system through air flow. Considering the influence of other factors, the allowable error range between the two is ±5%. Calculate the heat dissipation power from the right side of the formula, then compare ∑PtotalLoss with the heat dissipation power, and calculate the error between the two. If the error exceeds the allowable range, first check whether there is an unaccounted additional heat source in the cabinet (such as direct sunlight), then check whether components of the heat dissipation power part such as temperature sensors are normal and whether the ventilation system is working properly, etc. If the heat dissipation power part is normal, then check whether the loss calculations of each device in the total operating loss of the frequency converter cabinet are correct.

[0111] In this embodiment, verifying the total loss value through the thermodynamic equilibrium equation can effectively identify calculation model deviations or equipment anomalies, ensuring the accuracy of carbon footprint data.

[0112] The basic principle of the present application is described above in combination with specific embodiments. It should be understood that the above - disclosed specific details are only for the purpose of illustration and easy understanding, rather than limitation, and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for evaluating the carbon footprint of inverter cabinet operation loss, characterized in that: The steps include: S1. Calculate the operating loss of each component device in the inverter cabinet, including the inverter, input filter, output reactor, connecting conductor, protective circuit breaker, switchgear, cabinet cooling and ventilation device and control circuit; S2. Based on the preset regional power grid carbon emission factor, convert the operating loss value of each device calculated in S1 into carbon dioxide emission equivalent; S3, determine whether there are other associated devices that have not been calculated, if so, return to S1 to continue calculation; Otherwise, execute S4; S4. Accumulate the carbon dioxide emission equivalent of all equipment and output the overall carbon footprint data of the inverter cabinet.

2. The method for evaluating the carbon footprint of the inverter cabinet operation loss according to claim 1, characterized in that: The inverter operation loss calculation in S1 adopts the dynamic efficiency model, and the specific formula is as follows: Among them, Ploss is the inverter operation loss, Uout is the output voltage, Iout is the output current, is the output power factor, η is the inverter efficiency, and η is determined by interpolation based on the load rate-efficiency curve.

3. The method for evaluating the carbon footprint of the inverter cabinet operation loss according to claim 1, characterized in that: The input filter loss calculation in S1 includes the harmonic compensation factor, and the specific formula is as follows: Among them, Iin is the effective value of the input side current, RL is the inductor winding resistance, RC is the capacitor equivalent resistance, DFCu is the copper loss dynamic correction coefficient (harmonic compensation factor) determined based on the current harmonic distortion rate (THDi), DFFe is the iron loss harmonic compensation factor, and PFe is the core loss under the fundamental wave condition.

4. The method for evaluating the carbon footprint of the inverter cabinet operation loss according to claim 1, characterized in that: The specific formula for calculating the output reactor loss in S1 is: Where Rcoil is the output reactor winding resistance, and Ireactor is the effective value of the output side current.

5. The method for evaluating the carbon footprint of the inverter cabinet operation loss according to claim 1, characterized in that: The specific formula for calculating the running loss of the connecting conductor in S1 is as follows: Among them, n is the number of conductor phases, Rac is the AC resistance of the conductor, and the AC resistance correction model is used to correct the skin effect and proximity effect of the conductor resistance value. The specific formula is: Rac=Rdc×(1+ys+yp) Among them, Rdc is the DC resistance of the conductor, ys is the skin effect coefficient, and yp is the proximity effect coefficient.

6. The method for evaluating the carbon footprint of the inverter cabinet operation loss according to claim 4 or 5, characterized in that: The output reactor and connecting conductor operation loss calculation also includes a temperature compensation step to correct the resistance value for the ambient temperature, specifically: Rcorrected=R0×[1+α×(Tamb-20)] Among them, R0 is the DC resistance of the conductor at 20°C, α is the material temperature coefficient, and Tamb is the operating temperature of the conductor.

7. The method for evaluating the carbon footprint of the inverter cabinet operation loss according to claim 1, characterized in that: The calculation of the operating loss of the switchgear in S1 is specifically as follows: Among them, Irated is the rated current, Rcontact is the contact resistance, and Iload is the load current.

8. The method for evaluating the carbon footprint of the inverter cabinet operation loss according to claim 1, characterized in that: The inverter operation loss in S1 uses the segmented integration method to process dynamic loads, specifically: Among them, P(ti) is the average power loss in the i-th time period, Δti is the time interval length, which is 5 to 30 minutes to correspond to the real-time data collection cycle of the SCADA system; n is the total number of time periods.

9. The method for evaluating the carbon footprint of the inverter cabinet operation loss according to claim 1, characterized in that: The S4 also includes verifying the total loss value through a thermodynamic equilibrium equation, specifically: Among them, Qvent is the air volume of the ventilation system, ρ is the air density, cp is the specific heat capacity of air at constant pressure, ΔT is the temperature difference between the inside and outside of the cabinet, ∑PtotalLoss is the total operating loss of the inverter cabinet, and the allowable error range of the two is ±5%. When the range is exceeded, the review mechanism is triggered.

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