Method and device for calculating carbon emission, electronic equipment and readable storage medium

Abstract

The application discloses a carbon emission calculation method and device, electronic equipment and readable storage medium, which are used for calculating the carbon emission of an oil-immersed power transformer. The method comprises the following steps: obtaining operation data; the operation data comprises an operation voltage, an operation current and a power factor of the oil-immersed power transformer; determining input parameters according to the operation data; the input parameters comprise a load power, a three-phase current balance degree and a harmonic distortion rate; obtaining a top-layer oil temperature T top ; determining an average temperature T wnd of a winding and a temperature correction coefficient K temp according to the top-layer oil temperature T top ; determining an electric energy loss S according to the input parameters, the average temperature T wnd and the temperature correction coefficient K temp ; and determining a carbon emission G according to the electric energy loss S. The technical scheme provided by the application can be obtained from the equipment nameplate data, the factory test data and the three-phase voltage and current data in the power recording system, is suitable for quick carbon emission estimation, and has high accuracy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of calculating carbon emissions, and in particular to a method and device for calculating carbon emissions of an oil-immersed power transformer, an electronic device and a readable storage medium. BACKGROUND

[0002] With the rapid development of the national economy, energy consumption is increasing year by year, and high-energy-consuming industries (such as the power industry) have relatively large carbon emissions, which are the key areas of carbon emission control.

[0003] In the power industry, power transformers are the hub of power transmission and conversion. A large amount of power loss is generated during the operation of power transformers, resulting in a large amount of carbon dioxide emissions. Reducing and inhibiting carbon emissions from power transformers has great practical significance.

[0004] It should be noted that the carbon emissions during the operation stage of the power transformer account for a large part of the total emissions during the life cycle of the power transformer. Therefore, the focus of carbon emission reduction for power transformers is the effective inhibition of power loss during the operation stage, and for this purpose, the carbon emissions during the operation stage of the power transformer need to be finely accounted for. At present, the related technology for calculating the carbon emissions caused by the overall loss (i.e. "network loss") of the power grid is relatively mature, but the evaluation of the carbon emissions of the transformer under the operating conditions is relatively lagging behind, and the calculation result is not accurate.

[0005] Therefore, how to improve the accuracy of calculating the carbon emissions of the power transformer is a technical problem to be solved. SUMMARY

[0006] The present application provides a method and device for calculating carbon emissions, an electronic device and a readable storage medium, which can improve the accuracy of calculating the carbon emissions of an oil-immersed power transformer.

[0007] In a first aspect, the present application provides a method for calculating carbon emissions, which is used for calculating the carbon emissions of an oil-immersed power transformer, and the method comprises:

[0008] obtaining operation data of the oil-immersed power transformer; the operation data comprises an operating voltage, an operating current and a power factor of the oil-immersed power transformer;

[0009] determining input parameters according to the operation data; the input parameters comprise a load power P, a three-phase current balance degree ε and a harmonic distortion rate THD of the oil-immersed power transformer;

[0010] obtaining a top layer oil temperature T top of the oil-immersed power transformer;

[0011] determining the carbon emissions of the oil-immersed power transformer according to the top layer oil temperature T topdetermining an average temperature T of the winding of the oil-immersed power transformer wnd and a temperature correction coefficient K temp ;

[0012] determining an average temperature T of the winding of the oil-immersed power transformer wnd and a temperature correction coefficient K temp determining an electrical energy loss S of the oil-immersed power transformer according to the input parameter, the average temperature T a and the temperature correction coefficient K b ;

[0013] determining a carbon emission G of the oil-immersed power transformer according to the electrical energy loss S.

[0014] In the calculation of the carbon emission, the required input quantity can be obtained from the equipment nameplate data, factory test data and three-phase voltage and current data in the power recording system, which is suitable for the rapid estimation of the carbon emission of the on-site power transformer and has high accuracy.

[0015] In combination with the first aspect, in some implementations of the first aspect, the determining of the input parameter according to the operation data comprises:

[0016]

[0017] ε = (I 2 -I a ) c +(I 2 -I b ) c +(I 2 -I i ) a

[0018]

[0019] wherein I b (i ≥ 2) is the effective value of the i-th harmonic current of the current waveform, I1 is the effective value of the 50Hz fundamental current; U c ,U a ,U b are the effective values of the a, b and c three-phase voltages; I c ,I top ,I wnd are the effective values of the a, b and c three-phase currents; is the three-phase power factor.

[0020] In combination with the first aspect, in some implementations of the first aspect, the determining of the average temperature T of the winding of the oil-immersed power transformer and the temperature correction coefficient K temp comprises:

[0021]

[0022] wherein ΔT top-oil is the difference between the top oil temperature and the average oil temperature, ΔT wnd-oil is the difference between the winding average temperature and the average oil temperature, P std is the rated capacity of the oil-immersed power transformer, the loss ratio R is the ratio of the load loss to the no-load loss of the oil-immersed power transformer, ΔT t-o-std and ΔT w-o-std are ΔT top-oil and ΔT wnd-oil of the oil-immersed power transformer under rated voltage and rated current, and x and y are correction coefficients of the oil temperature rise and the winding temperature rise, respectively.

[0023]

[0024] wherein T wnd-std is the winding average temperature under rated condition, and the reference value is 85℃; and C is a coefficient related to the winding material, and the value is 235 for copper winding and 225 for aluminum winding.

[0025] In the calculation process of carbon emission, the average temperature of the winding is determined according to the top oil temperature data of the transformer, and the load loss (copper loss) is corrected, which is beneficial to improve the accuracy of the calculation.

[0026] In combination with the first aspect, in some implementations of the first aspect, the determination of the electric energy loss S of the oil-immersed power transformer according to the input parameter, the average temperature T wnd and the temperature correction coefficient K temp includes:

[0027]

[0028] wherein P c is the load loss under rated condition, P i is the no-load loss under rated condition, ΔP c1 is the additional copper loss considering three-phase imbalance, K temp_1 = (T wnd +C) / (T R1_std +C) is the temperature correction coefficient of the DC resistance of the secondary winding, T R1_std is the ambient temperature when the DC resistance of the secondary winding is tested, ΔP i1 is the additional iron loss considering three-phase imbalance, and is obtained through the equivalent resistance value R Fe of the eddy current loss of the clamp and the oil tank, the additional iron loss coefficient K Fe1 , and the three-phase current balance degree ε, R Fe and K Fe1Obtained by the manufacturer through numerical analysis and calculation of the transformer electromagnetic field; ΔP c2 is the additional copper loss when considering harmonics; ΔP i2 To consider the additional iron loss when harmonics are applied, K i_THD Obtained through numerical analysis and calculation of the transformer electromagnetic field by the manufacturer.

[0029] This embodiment takes into account the influence of harmonics and three-phase unbalance characteristics and proposes a calculation formula for the electric energy loss of an oil-immersed power transformer.

[0030] In combination with the first aspect, in certain implementations of the first aspect, determining the carbon emissions G of the oil-immersed power transformer based on the power loss S includes:

[0031] The carbon emissions of the oil-immersed power transformer within a certain time range

[0032] G=S·t R ·EF

[0033] Among them, t R is the operating time, and EF is the carbon emission factor of the power grid, which is calculated based on the public data of local environmental departments.

[0034] This embodiment obtains carbon emission data based on the power loss of the oil-immersed power transformer.

[0035] In a second aspect, an embodiment of the present application provides a carbon emissions calculation device for calculating the carbon emissions of an oil-immersed power transformer, the calculation device comprising:

[0036] A first acquiring unit is configured to acquire operating data of the oil-immersed power transformer; the operating data includes an operating voltage, an operating current, and a power factor of the oil-immersed power transformer;

[0037] a first processing unit, configured to determine input parameters according to the operating data acquired by the first acquiring unit; the input parameters including: load power P of the oil-immersed power transformer, three-phase current balance ε, and harmonic distortion rate THD;

[0038] The second acquisition unit is used to obtain the top oil temperature T of the oil-immersed power transformer top ;

[0039] The second processing unit is used to process the oil according to the top layer oil temperature T top Determine the average temperature T of the winding of the oil-immersed power transformer wnd and temperature correction factor K temp ; and for according to the input parameters, the average temperature T wnd and the temperature correction coefficient K tempdetermining an electric energy loss S of the oil-immersed power transformer; and further configured to determine a carbon emission G of the oil-immersed power transformer according to the electric energy loss S.

[0040] In the calculation of the carbon emission, the required input quantity can be obtained from the equipment nameplate data, factory test data and three-phase voltage and current data in the power recording system, and the application is suitable for fast estimation of the carbon emission of the on-site power transformer and has high accuracy.

[0041] With reference to the second aspect, in some implementations of the second aspect, in determining the input parameter according to the operation data, the first processing unit is specifically configured to calculate the input parameter according to the following expression:

[0042]

[0043] ε = (I a -I b ) 2 +(I a -I c ) 2 +(I b -I c ) 2

[0044]

[0045] wherein I i (i≥2) is the effective value of the i-th harmonic current of the current waveform, I1 is the effective value of the 50Hz fundamental current; U a ,U b ,U c are the effective values of the a, b and c three-phase voltages; I a ,I b ,I c are the effective values of the a, b and c three-phase currents. is the three-phase power factor.

[0046] With reference to the second aspect, in some implementations of the second aspect, in determining the average temperature T top of the winding of the oil-immersed power transformer and the temperature correction coefficient K wnd according to the top-layer oil temperature T temp , the second processing unit is specifically configured to calculate according to the following expression:

[0047]

[0048] wherein ΔT top-oil is the difference between the top-layer oil temperature and the average oil temperature, ΔT wnd-oil is the difference between the winding average temperature and the average oil temperature, Pstd R is the loss ratio of the oil-immersed power transformer, which is the ratio of the load loss to the no-load loss of the oil-immersed power transformer, ΔT t-o-std and ΔT w-o-std is ΔT top-oil of the oil-immersed power transformer under rated voltage and rated current wnd-oil and ΔT wnd-oil , x and y are correction coefficients of the oil temperature rise and the winding temperature rise, respectively;

[0049]

[0050] wherein, T wnd-std is the average temperature of the winding under rated state, the reference value is 85℃; C is a coefficient related to the winding material, 235 for copper winding and 225 for aluminum winding;

[0051] In combination with the second aspect, in some implementations of the second aspect, the determination of the electric energy loss S of the oil-immersed power transformer according to the input parameter, the average temperature T wnd and the temperature correction coefficient K temp includes:

[0052]

[0053] wherein, P c is the load loss under rated state, P i is the no-load loss under rated state; ΔP c1 is the additional copper loss considering three-phase imbalance, K temp_1 = (T wnd +C) / (T R1_std +C) is the temperature correction coefficient of the DC resistance of the secondary winding, T R1_std is the ambient temperature when the DC resistance of the secondary winding is tested; ΔP i1 is the additional iron loss considering three-phase imbalance, obtained by the equivalent resistance value R Fe of the eddy current loss of the clamp and the oil tank, the additional iron loss coefficient K Fe1 , and the three-phase current balance degree ε, R Fe and K Fe1 are obtained by the manufacturer through numerical analysis of the electromagnetic field of the transformer; ΔP c2 is the additional copper loss considering harmonics; ΔP i2 is the additional iron loss considering harmonics, K i_THD is obtained by the manufacturer through numerical analysis of the electromagnetic field of the transformer.

[0054] The embodiment considers the influence of harmonics and three-phase imbalance characteristics, and proposes a calculation formula of the electric energy loss of the oil-immersed power transformer.

[0055] With reference to the second aspect, in some implementations of the second aspect, the root determines the carbon emission G of the oil-immersed power transformer according to the electric energy loss S, including:

[0056] the carbon emission of the oil-immersed power transformer in a certain time range

[0057] G = S·t R ·EF

[0058] wherein, t R is the running time, and EF is the grid carbon emission factor, which is calculated according to the public data of the environmental department in each place.

[0059] This embodiment obtains the carbon emission data according to the electric energy loss of the oil-immersed power transformer.

[0060] In a third aspect, an electronic device is provided, including a memory and one or more processors, the memory being coupled to the processors; and wherein the memory stores computer program codes including computer instructions, when the computer instructions are executed by the processors, causing the electronic device to perform the carbon emission calculation method according to the first aspect or any possible implementation manner of the first aspect.

[0061] In a fourth aspect, a computer readable storage medium is provided, including computer instructions, when the computer instructions are run on an electronic device, causing the electronic device to perform the carbon emission calculation method according to the first aspect or any possible implementation manner of the first aspect.

[0062] It can be understood that the beneficial effects achieved by the carbon emission calculation device of the second aspect, the electronic device of the third aspect and the computer readable storage medium of the fourth aspect provided above can refer to the beneficial effects in the first aspect and any possible implementation manner thereof, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0063] Figure 1 is a flowchart of the carbon emission calculation method in an embodiment of the present application;

[0064] Figure 2 is a structural diagram of the carbon emission calculation device in an embodiment of the present application. DETAILED DESCRIPTION

[0065] In order to make the purpose, technical scheme and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0066] The terms "comprise", "comprising", "include", "including", "have", "having" and "contain", "containing" and any variations thereof in the specification and in the claims shall not be construed so as to exclude any step or element not specifically recited. For example, a process, method, system, product or apparatus that comprises a list of steps or elements does not necessarily comprise only those steps or elements in the list and can include additional steps or elements not expressly listed or inherent to such process, method, system, product or apparatus. Furthermore, the terms "first", "second" and "third" and the like, are used merely as identifiers for distinct objects and do not necessarily signify a particular order or sequence.

[0067] The related schemes usually do not consider the additional loss caused by harmonics and three-phase imbalance during the operation of the oil-immersed power transformer when calculating the carbon emission; and / or do not consider the influence caused by the temperature change of the equipment during the operation; and / or the required parameters of the calculation model are complex and diverse, and are difficult to obtain from the field of the power equipment and the power grid system. These deficiencies make the accuracy of the results obtained by the related method for calculating the carbon emission questionable.

[0068] To solve the above problems, the method for calculating the carbon emission provided by the present application is based on the real-time monitoring data of the field oil-immersed power transformer voltage, current and top layer oil temperature, and calculates the transformer load power, three-phase current balance degree and harmonic distortion rate. Then, the above three parameters are brought into the power loss calculation formula proposed by the present application, so that the loss power of the equipment can be accurately obtained. Finally, the loss power is combined with the carbon emission factor of the power grid, so that the carbon emission value of the oil-immersed power transformer in a certain period of time can be accurately obtained, thereby providing a reference for the carbon emission analysis and reduction of the power transformer.

[0069] Please refer to Figure 1 , Figure 1 is a flowchart of a method for calculating the carbon emission according to an embodiment of the present application. The method is used for calculating the carbon emission of an oil-immersed power transformer, as shown in Figure 1 The charging method is applied to an electronic device including a first fast charging chip and a battery in the embodiment, and the charging method includes steps 101 to 106. In the embodiment, the charging method includes the following steps.

[0070] 101. Obtain the operation data of the oil-immersed power transformer; the operation data includes the operation voltage, operation current and power factor of the oil-immersed power transformer.

[0071] In some possible implementations, the operation data of the oil-immersed power transformer can be extracted from the power grid information management system, including a, b and c three-phase voltage effective values U a ,U b ,U c and corresponding voltage waveforms, three-phase current effective values I a ,I b ,I cAnd the corresponding current waveform, and three-phase power factor

[0072] 102. Determine input parameters based on operating data; the input parameters include: load power P of the oil-immersed power transformer, three-phase current balance ε and harmonic distortion rate THD.

[0073] In some possible implementations, the input parameters may be determined based on the operating data using the following calculation method:

[0074]

[0075] ε=(I a -I b ) 2 +(I a -I c ) 2 +(I b -I c ) 2

[0076]

[0077] Among them, I i (i≥2) is the effective value of the i-th harmonic current of the current waveform, I1 is the effective value of the 50Hz fundamental current; U a ,U b ,U c is the effective value of the three-phase voltage of a, b, and c; I a ,I b ,I c is the effective value of the three-phase current of a, b, and c; is the three-phase power factor.

[0078] 103. Obtain the top oil temperature T of an oil-immersed power transformer top .

[0079] In some possible implementations, the top oil temperature T can be read from the oil temperature gauge on the oil-immersed power transformer or the current online monitoring data of the oil-immersed power transformer. top .

[0080] 104. According to the top oil temperature T top Determine the average winding temperature T of an oil-immersed power transformer wnd and temperature correction factor K temp .

[0081] In some possible implementations, according to the top oil temperature T top Determine the average winding temperature T of an oil-immersed power transformer wnd and temperature correction factor K temp, the following calculation method can be used:

[0082]

[0083] Where, ΔT top-oil is the difference between the top oil temperature and the average oil temperature, ΔT wnd-oil is the difference between the average winding temperature and the average oil temperature, P std is the rated capacity of the oil-immersed power transformer, the loss ratio R is the ratio of the load loss to the no-load loss of the oil-immersed power transformer, ΔT t-o-std and ΔT w-o-std is the ΔT of the oil-immersed power transformer at rated voltage and rated current top-oil and ΔT wnd-oil , x and y are the correction coefficients of oil temperature rise and winding temperature rise respectively; R, ΔT t-o-std , ΔT w-o-std The values ​​of , x and y refer to Table 1.

[0084] Table 1

[0085]

[0086]

[0087] Among them, T wnd-std is the average temperature of the winding under rated conditions, with a reference value of 85°C; C is a coefficient related to the winding material, with a value of 235 for copper windings and 225 for aluminum windings.

[0088] 105. According to the input parameters, average temperature T wnd and temperature correction factor K temp Determine the energy loss S of the oil-immersed power transformer.

[0089] In some possible implementations, according to the input parameters, the average temperature T wnd and temperature correction factor K temp To determine the energy loss S of an oil-immersed power transformer, the following calculation method can be used:

[0090]

[0091] Among them, P c is the load loss under rated conditions, P i is the no-load loss under rated conditions, ΔP c1 To consider the additional copper loss when the three phases are unbalanced, K temp_1 =(T wnd +C) / (T R1_std +C) is the temperature correction coefficient of the DC resistance of the secondary winding, T R1_stdis the ambient temperature during the secondary winding DC resistance test; ΔP i1 In order to consider the additional iron loss when the three phases are unbalanced, the equivalent resistance value RFe of the eddy current loss of the clamp and the oil tank and the additional iron loss coefficient K are used. Fe1 , and the three-phase current balance ε is obtained, R Fe and K Fe1 Obtained by the manufacturer through numerical analysis and calculation of the transformer electromagnetic field; ΔP c2 is the additional copper loss when harmonics are considered; ΔP i2 To consider the additional iron loss when harmonics are applied, K i_THD Obtained through numerical analysis and calculation of the transformer electromagnetic field by the manufacturer.

[0092] 106. Determine the carbon emissions G of an oil-immersed power transformer based on the power loss S.

[0093] In some possible implementations, the carbon emissions G of the oil-immersed power transformer are determined based on the power loss S. The following calculation method can be used: the carbon emissions of the oil-immersed power transformer within a certain time range,

[0094] G=S·t R ·EF

[0095] Among them, t R is the operating time, and EF is the carbon emission factor of the power grid, which is calculated based on the public data of local environmental departments.

[0096] The historical operating data of transformer #1 of a certain regional substation (oil-immersed three-phase double-winding on-load tap-changing power transformer, with oxygen-free copper winding, rated voltage 35kV, and rated power 6300kVA) for 40 days from April 1, 2020 to April 10, 2020, including the three-phase voltage {U a ,U b ,U c}, three-phase current {I a ,I b ,I c} and the power factor of each phase when considering three-phase imbalance Based on the historical operating data of voltage and current, the transformer load power P, three-phase current balance ε, and harmonic distortion rate THD and other information are calculated according to the following formula.

[0097] Use a power inspection robot or a power inspection drone to photograph the top oil temperature gauge of transformer #1 from April 1, 2020 to April 10, 2020. Take photos every 4 hours, 6 times a day. Based on the images, get 6 top oil temperature measurement data, and take the average to get the top oil temperature value T for that day. top .

[0098] The specific data is shown in Table 2.

[0099] Table 2

[0100]

[0101]

[0102] According to the above data, the average winding temperature T wnd and the temperature correction coefficient K temp for loss calculation are obtained.

[0103] Table 3

[0104] Date T wnd / ℃]] K temp ]]> 2020-4-1 57 0.91 2020-4-2 59 0.92 2020-4-3 55 0.91 2020-4-4 57 0.91 2020-4-5 56 0.91 2020-4-6 61 0.92 2020-4-7 61 0.92 2020-4-8 59 0.92 2020-4-9 59 0.92 2020-4-10 61 0.92

[0105] According to the factory test data of the transformer and the finite element simulation data, the rated no-load loss P i = 3.24 kW, the rated load loss P c = 31.08 kW, the resistance value R1 of the secondary side is 2.08 Ω (the ambient temperature during testing is 20℃), the equivalent resistance value R Fe of the eddy current loss of the clamp and the oil tank is 35 Ω, the additional iron loss coefficient K Fe1 = 0.9, and the harmonic eddy current iron loss coefficient K i_THD = 1.2.

[0106] Referring to the file of the Department of Ecological Environment “Notice on Doing a Good Job in 2023-2025 Greenhouse Gas Emission Report Management of Power Generation Industry Enterprises”, the carbon emission factor EF of the power grid is determined to be 0.5703 tons (CO2) / MW·h.

[0107] Since the carbon emission in one day needs to be calculated, t w is set to 24h.

[0108] Based on the above data, the power loss S of the transformer and the daily carbon emission G are shown in Table 4.

[0109] Table 4

[0110]

[0111]

[0112] When calculating the carbon emission, the input required for calculation can be obtained from the equipment nameplate data, factory test data and three-phase voltage and current data in the power recording system, which is suitable for rapid estimation of carbon emission of on-site power transformers and has high accuracy.

[0113] Please refer to Figure 2 , Figure 2is a structural schematic diagram of a carbon emission calculation device provided by an embodiment of the present application. The carbon emission calculation device 200 is used for calculating the carbon emission of an oil-immersed power transformer. The carbon emission calculation device 200 comprises a first acquisition unit 201, a first processing unit 202, a second acquisition unit 203 and a second processing unit. Wherein,

[0114] The first acquisition unit 201 is configured to acquire operation data of the oil-immersed power transformer. The operation data comprises an operation voltage, an operation current and a power factor of the oil-immersed power transformer.

[0115] The first processing unit 202 is configured to determine input parameters according to the operation data. The input parameters comprise a load power P of the oil-immersed power transformer, a three-phase current balance degree ε and a harmonic distortion rate THD.

[0116] In some possible implementation manners, the first processing unit 202 can determine the input parameters by using the following calculation method:

[0117]

[0118] ε=(I a -I b ) 2 +(I a -I c ) 2 +(I b -I c ) 2

[0119]

[0120] Wherein, I i (i≥2) is the effective value of the i-th harmonic current of the current waveform, I1 is the effective value of the 50Hz fundamental wave current; U a ,U b ,U c are the effective values of the a, b and c three-phase voltages; I a ,I b ,I c are the effective values of the a, b and c three-phase currents; cosφ a ,cosφ b ,cosφ c are the three-phase power factors.

[0121] The second acquisition unit 203 is configured to acquire a top layer oil temperature T top of the oil-immersed power transformer.

[0122] The second processing unit 204 is configured to determine an average temperature T of the winding of the oil-immersed power transformer according to the top layer oil temperature T top .wnd and temperature correction coefficient K temp ; and determining the power loss S of the oil-immersed power transformer according to the input parameters, the average temperature T wnd and the temperature correction coefficient K temp ; and further determining the carbon emission G of the oil-immersed power transformer according to the power loss S.

[0123] In some possible implementation manners, the second processing unit 204 determines the average temperature T top of the winding of the oil-immersed power transformer according to the top-layer oil temperature T wnd and the temperature correction coefficient K temp , which can be calculated by the following method:

[0124]

[0125] wherein ΔT top-oil is the difference between the top-layer oil temperature and the average oil temperature, ΔT wnd-oil is the difference between the winding average temperature and the average oil temperature, P std is the rated capacity of the oil-immersed power transformer, the loss ratio R is the ratio of the load loss to the no-load loss of the oil-immersed power transformer, ΔT t-o-std and ΔT w-o-std are ΔT top-oil and ΔT wnd-oil of the oil-immersed power transformer under rated voltage and rated current, and x and y are correction coefficients of the oil temperature rise and the winding temperature rise respectively.

[0126]

[0127] wherein T wnd-std is the winding average temperature under rated state, and the reference value is 85℃; C is a coefficient related to the winding material, and the value is 235 for copper winding and 225 for aluminum winding.

[0128] In some possible implementation manners, the second processing unit 204 determines the power loss S of the oil-immersed power transformer according to the input parameters, the average temperature T wnd and the temperature correction coefficient K temp , which can be calculated by the following method,

[0129]

[0130] wherein P c is the load loss under rated state, P i is the no-load loss under rated state; ΔP c1 is the additional copper loss considering three-phase imbalance, and K temp_1 = (T wnd+C) / (T R1_std +C) is the temperature correction coefficient of the DC resistance of the secondary winding, T R1_std is the ambient temperature during the secondary winding DC resistance test; ΔP i1 In order to consider the additional iron loss when the three phases are unbalanced, the equivalent resistance value R of the eddy current loss of the clamp and the tank is Fe , additional iron loss coefficient K Fe1 , and the three-phase current balance ε is obtained, R Fe and K Fe1 Obtained by the manufacturer through numerical analysis and calculation of the transformer electromagnetic field; ΔP c2 is the additional copper loss when harmonics are considered; ΔP i2 To consider the additional iron loss when harmonics are applied, K i_THD Obtained through numerical analysis and calculation of the transformer electromagnetic field by the manufacturer.

[0131] The second processing unit 204 determines the carbon emission G of the oil-immersed power transformer according to the power loss S by using the following calculation method: The carbon emission G of the oil-immersed power transformer within a certain time range is:

[0132] G=S·t R ·EF

[0133] Among them, t R is the operating time, and EF is the carbon emission factor of the power grid, which is calculated based on the public data of local environmental departments.

[0134] It should be understood that the structure illustrated in the embodiments of this application does not constitute a specific limitation on the carbon emissions calculation device 200. In other embodiments of this application, the carbon emissions calculation device 200 may include more or fewer components than illustrated, or may combine or separate certain components, or have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0135] An embodiment of the present application also provides an electronic device, comprising: a memory and one or more processors, wherein the memory is coupled to the processor; wherein computer program code is stored in the memory, and the computer program code includes computer instructions, and when the computer instructions are executed by the processor, the sub-device executes the steps in the above-mentioned method embodiments.

[0136] An embodiment of the present application further provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments can be implemented.

[0137] The embodiment of the present application provides a computer program product, which comprises a computer program capable of implementing the steps in each of the method embodiments described above when the computer program is executed by a processor.

[0138] The computer program product can be stored in a computer readable storage medium. The computer program product, when executed by a processor, can implement the steps of the above-described various method embodiments. The computer program product comprises computer program code, which can be in the form of source code, object code, executable code, or some intermediate form. The computer readable medium can include at least any entity or device capable of carrying the computer program code to the photographing device / electronic device, a recording medium, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunications signal, and a software distribution medium. For example, a U disk, a mobile hard disk, a magnetic disk or an optical disk, etc. In some jurisdictions, according to legislation and patent practice, the computer readable medium cannot be an electrical carrier signal and a telecommunications signal.

[0139] In the above embodiments, the description of each embodiment has its own focus, and the parts not described or recorded in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0140] Those skilled in the art can appreciate that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. The skilled person can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0141] In the embodiments provided in the present application, it should be understood that the disclosed method and electronic device can be implemented in other ways. For example, the above-described device / network device embodiments are only schematic, for example, the division of the modules or units is only a logical function division, and there can be another division manner in actual implementation, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms.

[0142] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0143] It should be understood that when used in the specification and the appended claims of the present application, the term "comprising" indicates the presence of the described features, integers, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0144] It should also be understood that the term "and / or" used in the specification and the appended claims of the present application means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0145] In the present application, the reference to "one embodiment" or "some embodiments" and the like means that the particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Therefore, the appearance of the phrases "in one embodiment", "in some embodiments", "in other some embodiments", "in yet some embodiments" and the like in various places in the specification does not necessarily all refer to the same embodiment, but means "one or more but not all embodiments", unless otherwise specifically stated. The terms "include", "contain", "have" and their variants mean "including but not limited to", unless otherwise specifically stated.

[0146] The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A method of calculating carbon emissions, characterized by, The method for calculating the carbon emission of the oil-immersed power transformer comprises: obtaining operation data of the oil-immersed power transformer; the operation data comprises: operation voltage, operation current and power factor of the oil-immersed power transformer; determining input parameters according to the operation data; the input parameters comprise: load power P, three-phase current balance degree ε and harmonic distortion rate THD of the oil-immersed power transformer; obtaining a top layer oil temperature T of the oil-immersed power transformer top ; According to the top layer oil temperature T top determining an average temperature T of the winding of the oil-immersed power transformer wnd and a temperature correction coefficient K temp ; determining the electrical energy loss S of the oil-immersed power transformer according to the input parameters, the average temperature T wnd and the temperature correction coefficient K temp ​ determining the carbon emission G of the oil-immersed power transformer according to the electric energy loss S.

2. The method of claim 1, wherein, The method for calculating the carbon emission of the oil-immersed power transformer comprises: Wherein, the I i (i≥2) is the effective value of i-th harmonic current of the current waveform, and the I1 is the effective value of 50Hz fundamental current; the U a ,U b ,U c is the effective value of a, b, c three-phase voltage; the I a ,I b ,I c is the effective value of a, b, c three-phase current; the is three-phase power factor.

3. The method of claim 2, wherein, The average temperature T of the winding of the oil-immersed power transformer is determined according to the oil temperature T of the top layer top The average temperature T of the winding of the oil-immersed power transformer is determined according to the oil temperature T of the top layer wnd And a temperature correction coefficient K temp , including: wherein the ΔT top-oil is the difference between the top layer oil temperature and the average oil temperature, the ΔT wnd-oil is the difference between the winding average temperature and the average oil temperature, the P std is the rated capacity of the oil-immersed power transformer, the R is the loss ratio which is the ratio of the load loss and the no-load loss of the oil-immersed power transformer, the ΔT t-o-std and the ΔT w-o-std are the ΔT top-oil and ΔT wnd-oil of the oil-immersed power transformer under rated voltage and rated current, and the x and y are correction coefficients of the oil temperature rise and the winding temperature rise, respectively. Wherein, the T wnd-std is the average temperature of the winding in the rated state; and the C is a coefficient related to the winding material.

4. The method of claim 3, wherein, said average temperature T wnd and said temperature correction factor K temp determining the electrical energy loss S of said oil-immersed power transformer, including: Wherein, the P c is the load loss under rated state, the P i is the no-load loss under rated state; the ΔP c1 is the additional copper loss considering three-phase imbalance, the K temp_1 =(T wnd +C) / (T R1_std +C) is the temperature correction coefficient of secondary winding DC resistance, the T R1_std is the ambient temperature when testing the secondary winding DC resistance; the ΔP i1 is the additional iron loss considering three-phase imbalance, obtained by the equivalent resistance value R Fe of the oil tank eddy current loss of the clamp, the additional iron loss coefficient K Fe1 , and the three-phase current balance degree ε, the R Fe and K Fe1 are obtained by the transformer electromagnetic field numerical analysis calculation of the manufacturer; the ΔP c2 is the additional copper loss considering harmonics; the ΔP i2 is the additional iron loss considering harmonics, the K i_THD is obtained by the transformer electromagnetic field numerical analysis calculation of the manufacturer.

5. The method of claim 4, wherein, The method for calculating the carbon emission of the oil-immersed power transformer comprises: The carbon emission of the oil-immersed power transformer in a certain time range G = S-t R • EF where t is the time, EF is the grid carbon emission factor, calculated from public data of local environmental departments. R is the running time, and EF is the grid carbon emission factor, calculated from public data of local environmental departments.

6. A carbon emission amount calculation device characterized by comprising: The calculation device for calculating the carbon emission of the oil-immersed power transformer comprises: a first obtaining unit configured to obtain operation data of the oil-immersed power transformer; the operation data comprises: operation voltage, operation current and power factor of the oil-immersed power transformer; a first processing unit configured to determine input parameters according to the operation data obtained by the first obtaining unit; the input parameters comprise: load power P, three-phase current balance degree ε and harmonic distortion rate THD of the oil-immersed power transformer; A second acquisition unit is configured to acquire a top layer oil temperature T of the oil-immersed power transformer top ; a second processing unit configured to determine an average temperature T of the winding of the oil-immersed power transformer according to the top layer oil temperature T top determine an average temperature T of the winding of the oil-immersed power transformer according to the top layer oil temperature T wnd and a temperature correction coefficient K temp ; and determine an electric energy loss S of the oil-immersed power transformer according to the input parameters, the average temperature T wnd and the temperature correction coefficient K temp ; and further determine a carbon emission G of the oil-immersed power transformer according to the electric energy loss S.

7. The computing device of claim 6, wherein, In terms of determining input parameters according to the operation data, the first processing unit is specifically configured to calculate the input parameters according to the following expression: e = (I a - I b ) 2 + I a - I c ) 2 + I b - I c ) 2 Wherein, the I i (i≥2) is the effective value of i-th harmonic current of the current waveform, and the I1 is the effective value of 50Hz fundamental current; the U a ,U b ,U c is the effective value of a, b, c three-phase voltage; the I a ,I b ,I c is the effective value of a, b, c three-phase current; the is the three-phase power factor.

8. The computing device of claim 7, wherein, According to the top oil temperature T top Determine the average temperature T of the winding of the oil-immersed power transformer wnd and temperature correction factor K temp In terms of the aspect, the second processing unit is specifically configured to perform calculation according to the following expression: wherein the ΔT top-oil is the difference between the top layer oil temperature and the average oil temperature, the ΔT wnd-oil is the difference between the winding average temperature and the average oil temperature, the P std is the rated capacity of the oil-immersed power transformer, the R is the loss ratio which is the ratio of the load loss and the no-load loss of the oil-immersed power transformer, the ΔT t-o-std and the ΔT w-o-std are the ΔT top-oil and the ΔT wnd-oil of the oil-immersed power transformer under rated voltage and rated current, and the x and the y are correction factors of the oil temperature rise and the winding temperature rise, respectively. wherein said T wnd-std is the average temperature of the winding in the rated state; said C is a coefficient related to the winding material; determining the electrical energy loss S of the oil-immersed power transformer according to the input parameter, the average temperature T wnd and the temperature correction coefficient K temp determining the electrical energy loss S of the oil-immersed power transformer according to the input parameter, the average temperature T wnd and the temperature correction coefficient K temp Wherein, the P c is the load loss under rated state, the P i is the no-load loss under rated state; the ΔP c1 is the additional copper loss considering three-phase imbalance, the K temp_1 =(T wnd +C) / (T R1_std +C) is the temperature correction coefficient of secondary winding DC resistance, the T R1_std is the ambient temperature when testing the secondary winding DC resistance; the ΔP i1 is the additional iron loss considering three-phase imbalance, obtained by the equivalent resistance value R Fe of the oil tank eddy current loss of the clamp, the additional iron loss coefficient K Fe1 , and the three-phase current balance degree ε; the R Fe and K Fe1 are obtained by the transformer electromagnetic field numerical analysis calculation of the manufacturer; the ΔP c2 is the additional copper loss considering harmonics; the ΔP i2 is the additional iron loss considering harmonics, the K i_THD is obtained by the transformer electromagnetic field numerical analysis calculation of the manufacturer.

9. An electronic device, comprising: including: a memory and one or more processors, the memory being coupled with the processors; wherein the memory has computer program code stored therein, the computer program code comprising computer instructions, when the computer instructions are executed by the processors, causing the electronic device to perform the method according to any one of claims 1-5.

10. A computer-readable storage medium, characterized in that, including computer instructions, when the computer instructions are executed on an electronic device, causing the electronic device to perform the method according to any one of claims 1-5.

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