CN108229095A - The Forecasting Methodology and terminal device of oil dissolved gas volume fraction - Google Patents
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Abstract
The present invention is suitable for dissolved gas monitoring technical field, provides a kind of Forecasting Methodology and terminal device of oil dissolved gas volume fraction.This method includes：Obtain respectively first time point under nonequilibrium condition, the second time point and during third time point in gas chamber gas component volume fraction；According to the volume fraction of gas component in the corresponding volume fraction of the first time point, second time point corresponding volume fraction, the third time point corresponding volume fraction and volume fraction predictor formula calculated equilibrium state lower chamber.The volume fraction of gas component that the present invention can be arrived according to multi collect under nonequilibrium condition, predict the end value of the gas component volumes score in equilibrium state gas chamber, it need not wait for and penetrate into the volume fraction that equilibrium state measures gas in gas chamber again later, so as to reduce the time measured needed for oil dissolved gas volume fraction.
Description
Technical Field
The invention belongs to the technical field of dissolved gas monitoring, and particularly relates to a method for predicting volume fraction of dissolved gas in oil and terminal equipment.
Background
With the development of the power grid towards a high automation direction and the increasing requirements of the national civilians on the power supply reliability, the current equipment maintenance system is urgently needed to be changed, and the development trend that the state maintenance system based on the online monitoring and fault diagnosis technology gradually replaces the preventive maintenance system becomes necessary. Compared with the price of the traditional online monitoring device, the online monitoring device has obvious advantages in technical economy, improves the management level of the operation of the transformer substation, and lays a foundation for the transition from a preventive maintenance system to a predictive maintenance system.
Fault gas of oil-filled power equipment is dissolved in insulating oil after being generated, and key technologies in online monitoring of the gas dissolved in the oil comprise an oil-gas separation technology and a gas quantitative analysis technology. At present, an online monitoring system needs to give accurate volume fraction of dissolved gas in oil after gas permeation reaches balance, and due to the limitation of an oil-gas separation technology, the time required for fault gas to reach balance is usually long. For example, Roland Gilbert tested the permeability of the gas collector GP100 from Morgan Schafer, where H is2Equilibrium is reached after 6h, and C with the longest equilibration time is required3H8Equilibrium is reached after 239.3h, and the rest of the gas reaches equilibrium within 96 h; a novel oil-gas separation membrane developed by Lihurie et al of Qinghua university realizes C within 12h2H2、C2H4、C2H6、CH4、CO、CO2、H2A total of 7 fault gases. However, the time required for the fault gas to reach the equilibrium is still long, and the real-time requirement of the dissolved gas online monitoring of oil-filled power equipment is difficult to meet.
Disclosure of Invention
In view of this, the embodiment of the invention provides a method for predicting volume fraction of dissolved gas in oil and a terminal device, so as to solve the problem that the existing volume fraction prediction method is difficult to meet the real-time requirement of online monitoring of dissolved gas in oil-filled power equipment.
A first aspect of an embodiment of the present invention provides a method for predicting volume fraction of gas dissolved in oil, including:
respectively obtaining the volume fractions of gas components in the gas chamber at a first time point, a second time point and a third time point in a non-equilibrium state; wherein an interval between the first point in time and the second point in time is equal to an interval between the second point in time and the third point in time; the gas in the gas chamber is obtained by separating the dissolved gas in the oil of the oil-filled power equipment through an oil-gas separation membrane;
and calculating the volume fraction of the gas component in the gas chamber in the equilibrium state according to the volume fraction corresponding to the first time point, the volume fraction corresponding to the second time point, the volume fraction corresponding to the third time point and a volume fraction prediction formula.
A second aspect of embodiments of the present invention provides an apparatus for predicting a volume fraction of a gas dissolved in oil, including:
the acquisition module is used for respectively acquiring the volume fractions of the gas components in the gas chamber at a first time point, a second time point and a third time point in a non-equilibrium state; wherein an interval between the first point in time and the second point in time is equal to an interval between the second point in time and the third point in time; the gas in the gas chamber is obtained by separating the dissolved gas in the oil of the oil-filled power equipment through an oil-gas separation membrane;
and the processing module is used for calculating the volume fraction of the gas component in the gas chamber in the equilibrium state according to the volume fraction corresponding to the first time point, the volume fraction corresponding to the second time point, the volume fraction corresponding to the third time point and a volume fraction prediction formula.
A third aspect of embodiments of the present invention provides a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the method for predicting volume fraction of dissolved gas in oil in the first aspect when executing the computer program.
A fourth aspect of embodiments of the present invention provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the method of predicting the volume fraction of dissolved gas in oil of the first aspect.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: the volume fraction corresponding to the first time point, the volume fraction corresponding to the second time point, the volume fraction corresponding to the third time point and a volume fraction prediction formula in a non-equilibrium state are calculated, so that the volume fraction of the gas component in the gas chamber in the equilibrium state can be predicted, and the prediction of the volume fraction of the gas dissolved in the oil is realized. According to the embodiment of the invention, the final value of the volume fraction of the gas component in the gas chamber in the balanced state can be predicted according to the volume fractions of the gas component acquired for multiple times in the non-balanced state, and the volume fraction of the gas in the gas chamber is not required to be measured after the gas permeates into the balanced state, so that the time required for measuring the volume fraction of the dissolved gas in the oil is reduced, and the requirement of the real-time online monitoring of the dissolved gas in oil-filled power equipment is met.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a flow chart of an implementation of a method for predicting volume fraction of dissolved gas in oil according to an embodiment of the present invention;
FIG. 2 is a flow chart of an implementation of adjusting a preset time interval in a method for predicting volume fraction of gas dissolved in oil according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an apparatus for predicting the volume fraction of dissolved gas in oil provided by an embodiment of the present invention;
fig. 4 is a schematic diagram of a terminal device for predicting volume fraction of gas dissolved in oil according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Fig. 1 is a flowchart of an implementation of the method for predicting volume fraction of gas dissolved in oil according to the embodiment of the present invention, which is detailed as follows:
in S101, volume fractions of gas components in the gas chamber at a first time point, a second time point and a third time point in a non-equilibrium state are respectively obtained; wherein an interval between the first point in time and the second point in time is equal to an interval between the second point in time and the third point in time; and the gas in the gas chamber is obtained by separating the dissolved gas in the oil of the oil-filled power equipment through an oil-gas separation membrane.
In this embodiment, during the separation process of the dissolved gas in the oil of the oil-filled power equipment by using the oil-gas separation membrane, the dissolved gas in the oil is initially in an unbalanced state, and the dissolved gas in the oil continuously permeates into the gas chamber above the oil layer through the oil-gas separation membrane. When the gas in the oil and the gas chamber reaches the equilibrium state, the gas components in the gas chamber are hardly changed, and then the gas chamber enters the equilibrium state. The gas in the chamber may contain a plurality of gas components, which may include, for example, hydrogen H2Carbon monoxide CO and carbon dioxide CO2And methane CH4The prediction method provided by the embodiment of the invention canThe following description will be given by taking the prediction of the volume fraction of a certain gas component as an example, for predicting the volume fraction of each gas component individually.
And selecting a first time point, a second time point and a third time point in a non-equilibrium state, and respectively collecting the volume fractions of certain gas components in the gas chamber at the three time points. For example, the volume fraction corresponding to the first time point is first acquired, and then the volume fraction corresponding to the second time point and the volume fraction corresponding to the third time point are respectively acquired at the same time interval.
In S102, the volume fraction of the gas component in the gas chamber in the equilibrium state is calculated according to the volume fraction corresponding to the first time point, the volume fraction corresponding to the second time point, the volume fraction corresponding to the third time point, and a volume fraction prediction formula.
In this embodiment, the volume fraction corresponding to the first time point, the volume fraction corresponding to the second time point, and the volume fraction corresponding to the third time point are obtained and substituted into the volume fraction prediction formula for calculation, so that the volume fraction of the gas component in the gas chamber in the equilibrium state can be calculated. And (4) carrying out online monitoring on the dissolved gas of the oil-filled power equipment according to the predicted volume fraction of each target gas component in the gas chamber in the equilibrium state.
According to the embodiment of the invention, the volume fraction corresponding to the first time point, the volume fraction corresponding to the second time point, the volume fraction corresponding to the third time point and the volume fraction prediction formula in the non-equilibrium state are calculated, so that the volume fraction of the gas component in the gas chamber in the equilibrium state can be predicted, and the prediction of the volume fraction of the gas dissolved in the oil is realized. According to the embodiment of the invention, the final value of the volume fraction of the gas component in the gas chamber in the balanced state can be predicted according to the volume fractions of the gas component acquired for multiple times in the non-balanced state, and the volume fraction of the gas in the gas chamber is not required to be measured after the gas permeates into the balanced state, so that the time required for measuring the volume fraction of the dissolved gas in the oil is reduced, and the requirement of the real-time online monitoring of the dissolved gas in oil-filled power equipment is met.
As an embodiment of the present invention, the volume fraction prediction formula is:
wherein,is the volume fraction of the gas component in the gas chamber at equilibrium; ci(n-1)A volume fraction corresponding to the first time point; cinA volume fraction corresponding to the second time point; ci(n+1)Is the volume fraction corresponding to the third time point.
As an embodiment of the present invention, the calculation process of the volume fraction prediction formula specifically includes:
according to the volume fraction of the gas component in the gas chamber during the membrane separation of the dissolved gas in the oil:
wherein b is the diffusion coefficient; t is the time after the start of permeation; ciIs the volume fraction of the gas component in the gas cell at t;
obtaining a first time point t under the non-equilibrium staten-1Volume fraction of gas component in time gas chamber and second time point tnThe relationship between the volume fractions of the gas components in the time gas chamber:
where, t isn-tn-1；Ci(n-1)Is tn-1The volume fraction of the gas component in the time gas chamber; cinIs tnThe volume fraction of the gas component in the time gas chamber;
obtaining an intermediate calculation formula according to the relation formula:
where, t isn-tn-1＝tn+1-tn；Ci(n+1)Is a third time point tn+1The volume fraction of the gas component in the time gas chamber;
and simplifying the intermediate calculation formula to obtain a volume fraction prediction formula shown as a formula (1).
The calculation process of the volume fraction prediction formula is explained in detail below.
By analyzing the membrane permeation mechanism, a dynamic process expression of the membrane for oil-gas separation, namely a relational expression of the volume fraction changing along with time, and the volume fraction C of a certain gas component in a gas chamber in the membrane separation process can be obtainediThe change rule of (2) is shown in the formula. As can be seen from equation (2), it is generally only valuable when the permeation reaches a measure of the volume of the equilibrium gas, which means that none of the measured data before the point in time of equilibrium is accurately reflective of the volume fraction of dissolved gas in the oil. The prediction method provided by the embodiment of the invention can solve the problem.
In the non-equilibrium state, let t ben-1Volume fraction measured at point Ci(n-1)，tnVolume fraction measured at point CinWhen the volume fraction corresponding to the equilibrium of the permeation process isThen there is the following relationship:
due to the point in time tn-1And tnIn a separate permeation process, there is bn-1＝bnB, setting the measurement time interval tn-tn-1When the temperature is constant, the relationship shown in equation (3) holds.
In the same way, t can be obtainednVolume fraction measured at point CinAnd tn+1Volume fraction measured at point Ci(n+1)The relation of (A) is as follows:
the joint formula (3) and the formula (6) can obtain an intermediate calculation formula shown in the formula (4), and the intermediate calculation formula is simplified to finally obtain a volume fraction prediction formula shown in the formula (1).
As can be seen from the calculation process, the influence of the diffusion coefficient b on the volume fraction prediction result is ingeniously eliminated by the prediction method. Because the size of the diffusion coefficient b is related to the temperature and the pressure, the volume fraction prediction formula provided by the embodiment of the invention is used for predicting, so that the influence of the external temperature and the pressure on the prediction result can be eliminated, and the accuracy of the volume fraction prediction result is improved.
In the embodiment, the measured values of the volume fractions of the gas components at the same time interval in the same permeation process can be used for calculation, the final value of the volume fraction of the gas component in the gas chamber in the equilibrium state is accurately predicted under the condition that the value of the diffusion coefficient b is not obtained, and the volume fraction of the gas in the gas chamber is not required to be measured after permeation enters the equilibrium state, so that the time for obtaining the volume fraction of the gas component in the gas chamber in the equilibrium state is reduced.
As an embodiment of the present invention, the obtaining the volume fractions of the gas components in the gas chamber at the first time point, the second time point and the third time point in the non-equilibrium state respectively comprises:
acquiring the volume fraction of the gas component in the gas chamber once every preset time interval in a non-equilibrium state, taking the volume fractions acquired three times adjacent to each other as a group of acquired data, and sequentially taking the three volume fractions in each group of acquired data as the volume fractions of the gas component in the gas chamber at a first time point, a second time point and a third time point according to a time sequence;
the calculating the volume fraction of the gas component in the gas chamber in the equilibrium state according to the volume fraction corresponding to the first time point, the volume fraction corresponding to the second time point, the volume fraction corresponding to the third time point and a volume fraction prediction formula comprises:
respectively calculating the volume fractions of the gas components in the gas chamber in the equilibrium state corresponding to each group of the acquired data according to the volume fraction corresponding to the first time point, the volume fraction corresponding to the second time point, the volume fraction corresponding to the third time point and the volume fraction prediction formula in each group of the acquired data;
and averaging the volume fractions of the gas components in the gas chamber in the equilibrium state corresponding to each group of acquired data, and taking the average value as the volume fraction of the gas components in the gas chamber in the equilibrium state.
For example, when the permeation of the oil-filled power equipment is in a non-equilibrium state, the volume fractions of the gas components in the gas chamber are obtained once at preset time intervals (for example, 10 minutes), and if the sequentially collected volume fractions are A, B, C, D, E and F in chronological order, the divided collected data may be four groups, specifically (A, B, C), (B, C, D), (C, D, E) and (D, E, F); or the divided collected data may be in two groups, specifically (A, B, C) and (D, E, F), respectively.
The volume fractions of the gas components in the gas chamber in the equilibrium state corresponding to the sets of the acquired data can be predicted according to the sets of the acquired data and the volume fraction prediction formula, and the final volume fractions of the gas components in the gas chamber in the equilibrium state can be obtained by averaging the volume fractions corresponding to the sets of the acquired data.
In the embodiment, the volume fractions predicted by the data sets acquired for multiple times are averaged, so that the influence of single data acquisition errors on the final prediction result can be reduced, and the prediction accuracy of the volume fractions of the gas components in the gas chamber in the equilibrium state is further improved.
As an embodiment of the present invention, as shown in fig. 2, after taking the average value as the volume fraction of the gas component in the gas chamber in the equilibrium state, the method may further include:
in S201, on-line analysis of dissolved gas in oil is performed based on the volume fraction of each gas component in the gas cell at equilibrium.
In this embodiment, on-line analysis of dissolved gas in oil can be performed based on the volume fractions of the gas components in the gas chamber in the predicted equilibrium state, and whether or not a fault has occurred in the oil-filled power equipment, the cause of the fault, and the like can be analyzed. For example, whether the oil-filled power equipment fails or not can be judged by comparing the volume fraction of each gas component in the gas chamber in the equilibrium state with a preset early warning value.
In S202, the preset time interval is adjusted according to the online analysis result of the dissolved gas in the oil.
In this embodiment, the preset time interval may be adjusted according to the online analysis result of the dissolved gas in the oil, so as to adjust the time for predicting the volume fraction of each gas component in the gas chamber in the equilibrium state, and enable the online analysis result of the dissolved gas in the oil to more effectively track the operation state of the oil-filled power equipment such as the transformer. For example, a first preset threshold value can be set, if the online analysis result of the dissolved gas in the oil exceeds the first preset threshold value, the oil-filled power equipment is easy to break down, the preset time can be shortened, the prediction time of the volume fraction of each gas component in the gas chamber in the balanced state is shortened, the problem that the fault of the oil-filled power equipment cannot be found in time due to overlong prediction time is avoided, and the running state of the oil-filled power equipment such as a transformer and the like is tracked more effectively.
As an embodiment of the present invention, the embodiment of the present invention verifies the effectiveness and real-time performance of the volume fraction prediction algorithm of dissolved gas in oil by performing a comparative study with an offline gas chromatography measurement. In order to obtain the volume fractions of various gas components in the gas chamber in an equilibrium state, the volume fractions are respectively measured by an off-line gas chromatograph, predicted according to a single set of collected data and predicted according to a plurality of sets of collected data in an average manner, and the data pair is verified as shown in table 1.
Table 1 verification data comparison table
As can be seen from Table 1, the method for predicting the gas volume fraction in the equilibrium state has high accuracy and short time, and can meet the requirements of online monitoring of dissolved gas in oil on the effectiveness and timeliness of the volume fraction.
According to the embodiment of the invention, the volume fraction corresponding to the first time point, the volume fraction corresponding to the second time point, the volume fraction corresponding to the third time point and the volume fraction prediction formula in the non-equilibrium state are calculated, so that the volume fraction of the gas component in the gas chamber in the equilibrium state can be predicted, and the prediction of the volume fraction of the gas dissolved in the oil is realized. According to the embodiment of the invention, the final value of the volume fraction of the gas component in the gas chamber in the balanced state can be predicted according to the volume fractions of the gas component acquired for multiple times in the non-balanced state, and the volume fraction of the gas in the gas chamber is not required to be measured after the gas permeates into the balanced state, so that the time required for measuring the volume fraction of the dissolved gas in the oil is reduced, and the requirement of the real-time online monitoring of the dissolved gas in oil-filled power equipment is met.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
Corresponding to the method for predicting the volume fraction of gas dissolved in oil described in the above embodiments, fig. 3 shows a schematic diagram of a device for predicting the volume fraction of gas dissolved in oil provided by an embodiment of the present invention. For convenience of explanation, only the portions related to the present embodiment are shown.
Referring to fig. 3, the apparatus includes an acquisition module 31 and a processing module 32.
An obtaining module 31, configured to obtain volume fractions of gas components in the gas chamber at a first time point, a second time point, and a third time point in a non-equilibrium state, respectively; wherein an interval between the first point in time and the second point in time is equal to an interval between the second point in time and the third point in time; and the gas in the gas chamber is obtained by separating the dissolved gas in the oil of the oil-filled power equipment through an oil-gas separation membrane.
And the processing module 32 is configured to calculate the volume fraction of the gas component in the gas chamber in the equilibrium state according to the volume fraction corresponding to the first time point, the volume fraction corresponding to the second time point, the volume fraction corresponding to the third time point, and a volume fraction prediction formula.
Preferably, the volume fraction prediction formula is:
wherein,is the volume fraction of the gas component in the gas chamber at equilibrium; ci(n-1)A volume fraction corresponding to the first time point; cinA volume fraction corresponding to the second time point; ci(n+1)Is the volume fraction corresponding to the third time point.
Preferably, the calculation process of the volume fraction prediction formula specifically includes:
according to the volume fraction of the gas component in the gas chamber during the membrane separation of the dissolved gas in the oil:
wherein b is the diffusion coefficient; t is the time after the start of permeation; ciIs the volume fraction of the gas component in the gas cell at t;
obtaining a first time point t under the non-equilibrium staten-1Volume fraction of gas component in time gas chamber and second time point tnThe relationship between the volume fractions of the gas components in the time gas chamber:
where, t isn-tn-1；Ci(n-1)Is tn-1The volume fraction of the gas component in the time gas chamber; cinIs tnThe volume fraction of the gas component in the time gas chamber;
obtaining an intermediate calculation formula according to the relation formula:
where, t isn-tn-1＝tn+1-tn；Ci(n+1)Is a third time point tn+1The volume fraction of the gas component in the time gas chamber;
and simplifying the intermediate calculation formula to obtain the volume fraction prediction formula.
Preferably, the obtaining module 31 is specifically configured to:
acquiring the volume fraction of the gas component in the gas chamber once every preset time interval in a non-equilibrium state, taking the volume fractions acquired three times adjacent to each other as a group of acquired data, and sequentially taking the three volume fractions in each group of acquired data as the volume fractions of the gas component in the gas chamber at a first time point, a second time point and a third time point according to a time sequence;
the processing module 32 is specifically configured to:
respectively calculating the volume fractions of the gas components in the gas chamber in the equilibrium state corresponding to each group of the acquired data according to the volume fraction corresponding to the first time point, the volume fraction corresponding to the second time point, the volume fraction corresponding to the third time point and the volume fraction prediction formula in each group of the acquired data;
and averaging the volume fractions of the gas components in the gas chamber in the equilibrium state corresponding to each group of acquired data, and taking the average value as the volume fraction of the gas components in the gas chamber in the equilibrium state.
Preferably, the apparatus further comprises an adjustment module configured to:
carrying out online analysis on dissolved gas in oil according to the volume fraction of each gas component in the gas chamber in a balanced state;
and adjusting the preset time interval according to the online analysis result of the dissolved gas in the oil.
According to the embodiment of the invention, the volume fraction corresponding to the first time point, the volume fraction corresponding to the second time point, the volume fraction corresponding to the third time point and the volume fraction prediction formula in the non-equilibrium state are calculated, so that the volume fraction of the gas component in the gas chamber in the equilibrium state can be predicted, and the prediction of the volume fraction of the gas dissolved in the oil is realized. According to the embodiment of the invention, the final value of the volume fraction of the gas component in the gas chamber in the balanced state can be predicted according to the volume fractions of the gas component acquired for multiple times in the non-balanced state, and the volume fraction of the gas in the gas chamber is not required to be measured after the gas permeates into the balanced state, so that the time required for measuring the volume fraction of the dissolved gas in the oil is reduced, and the requirement of the real-time online monitoring of the dissolved gas in oil-filled power equipment is met.
Fig. 4 is a schematic diagram of a terminal device according to an embodiment of the present invention. As shown in fig. 4, the terminal device 4 of this embodiment includes: a processor 40, a memory 41 and a computer program 42 stored in said memory 41 and executable on said processor 40, such as a prediction program of the volume fraction of dissolved gas in oil. The processor 40, when executing the computer program 42, implements the steps in the various above-described embodiments of the method for predicting the volume fraction of dissolved gas in oil, such as the steps 101-102 shown in fig. 1. Alternatively, the processor 40, when executing the computer program 42, implements the functions of the modules/units in the above-mentioned device embodiments, such as the functions of the modules 31 to 32 shown in fig. 3.
Illustratively, the computer program 42 may be partitioned into one or more modules/units that are stored in the memory 41 and executed by the processor 40 to implement the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program 42 in the terminal device 4. For example, the computer program 42 may be divided into an acquisition module and a processing module, and the specific functions of each module are as follows:
the acquisition module is used for respectively acquiring the volume fractions of the gas components in the gas chamber at a first time point, a second time point and a third time point in a non-equilibrium state; wherein an interval between the first point in time and the second point in time is equal to an interval between the second point in time and the third point in time; the gas in the gas chamber is obtained by separating the dissolved gas in the oil of the oil-filled power equipment through an oil-gas separation membrane;
and the processing module is used for calculating the volume fraction of the gas component in the gas chamber in the equilibrium state according to the volume fraction corresponding to the first time point, the volume fraction corresponding to the second time point, the volume fraction corresponding to the third time point and a volume fraction prediction formula.
The terminal device 4 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal device may include, but is not limited to, a processor 40, a memory 41. Those skilled in the art will appreciate that fig. 4 is merely an example of a terminal device 4 and does not constitute a limitation of terminal device 4 and may include more or fewer components than shown, or some components may be combined, or different components, for example, the terminal device may also include an input-output device, a network access device, a bus, a display, etc.
The Processor 40 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 41 may be an internal storage unit of the terminal device 4, such as a hard disk or a memory of the terminal device 4. The memory 41 may also be an external storage device of the terminal device 4, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the terminal device 4. Further, the memory 41 may also include both an internal storage unit and an external storage device of the terminal device 4. The memory 41 is used for storing the computer program and other programs and data required by the terminal device. The memory 41 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media which may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A method for predicting volume fraction of gas dissolved in oil, comprising:
respectively obtaining the volume fractions of gas components in the gas chamber at a first time point, a second time point and a third time point in a non-equilibrium state; wherein an interval between the first point in time and the second point in time is equal to an interval between the second point in time and the third point in time; the gas in the gas chamber is obtained by separating the dissolved gas in the oil of the oil-filled power equipment through an oil-gas separation membrane;
and calculating the volume fraction of the gas component in the gas chamber in the equilibrium state according to the volume fraction corresponding to the first time point, the volume fraction corresponding to the second time point, the volume fraction corresponding to the third time point and a volume fraction prediction formula.
2. The method of predicting the volume fraction of gas dissolved in oil according to claim 1, wherein the volume fraction prediction formula is:
wherein,is the volume fraction of the gas component in the gas chamber at equilibrium; ci(n-1)A volume fraction corresponding to the first time point; cinA volume fraction corresponding to the second time point; ci(n+1)Is the volume fraction corresponding to the third time point.
3. The method for predicting the volume fraction of gas dissolved in oil according to claim 2, wherein the volume fraction prediction formula is calculated by:
according to the volume fraction of the gas component in the gas chamber during the membrane separation of the dissolved gas in the oil:
wherein b is the diffusion coefficient; t is the time after the start of permeation; ciIs the volume fraction of the gas component in the gas cell at t;
obtaining a first time point t under the non-equilibrium staten-1Volume fraction of gas component in time gas chamber and second time point tnThe relationship between the volume fractions of the gas components in the time gas chamber:
where, t isn-tn-1；Ci(n-1)Is tn-1The volume fraction of the gas component in the time gas chamber; cinIs tnThe volume fraction of the gas component in the time gas chamber;
obtaining an intermediate calculation formula according to the relation formula:
where, t isn-tn-1＝tn+1-tn；Ci(n+1)Is a third time point tn+1The volume fraction of the gas component in the time gas chamber;
and simplifying the intermediate calculation formula to obtain the volume fraction prediction formula.
4. The method for predicting the volume fraction of the gas dissolved in the oil according to any one of claims 1 to 3, wherein the step of obtaining the volume fractions of the gas component in the gas chamber at the first time point, the second time point and the third time point in the non-equilibrium state respectively comprises:
acquiring the volume fraction of the gas component in the gas chamber once every preset time interval in a non-equilibrium state, taking the volume fractions acquired three times adjacent to each other as a group of acquired data, and sequentially taking the three volume fractions in each group of acquired data as the volume fractions of the gas component in the gas chamber at a first time point, a second time point and a third time point according to a time sequence;
the calculating the volume fraction of the gas component in the gas chamber in the equilibrium state according to the volume fraction corresponding to the first time point, the volume fraction corresponding to the second time point, the volume fraction corresponding to the third time point and a volume fraction prediction formula comprises:
respectively calculating the volume fractions of the gas components in the gas chamber in the equilibrium state corresponding to each group of the acquired data according to the volume fraction corresponding to the first time point, the volume fraction corresponding to the second time point, the volume fraction corresponding to the third time point and the volume fraction prediction formula in each group of the acquired data;
and averaging the volume fractions of the gas components in the gas chamber in the equilibrium state corresponding to each group of acquired data, and taking the average value as the volume fraction of the gas components in the gas chamber in the equilibrium state.
5. The method for predicting the volume fraction of gas dissolved in oil according to claim 4, further comprising, after said taking the average value as the volume fraction of the gas component in the gas cell at the equilibrium state:
carrying out online analysis on dissolved gas in oil according to the volume fraction of each gas component in the gas chamber in a balanced state;
and adjusting the preset time interval according to the online analysis result of the dissolved gas in the oil.
6. An apparatus for predicting volume fraction of gas dissolved in oil, comprising:
the acquisition module is used for respectively acquiring the volume fractions of the gas components in the gas chamber at a first time point, a second time point and a third time point in a non-equilibrium state; wherein an interval between the first point in time and the second point in time is equal to an interval between the second point in time and the third point in time; the gas in the gas chamber is obtained by separating the dissolved gas in the oil of the oil-filled power equipment through an oil-gas separation membrane;
and the processing module is used for calculating the volume fraction of the gas component in the gas chamber in the equilibrium state according to the volume fraction corresponding to the first time point, the volume fraction corresponding to the second time point, the volume fraction corresponding to the third time point and a volume fraction prediction formula.
7. An apparatus for predicting volume fraction of gas dissolved in oil, comprising: the volume fraction prediction formula is as follows:
wherein,is the volume fraction of the gas component in the gas chamber at equilibrium; ci(n-1)A volume fraction corresponding to the first time point; cinA volume fraction corresponding to the second time point; ci(n+1)Is the volume fraction corresponding to the third time point.
8. The apparatus for predicting the volume fraction of gas dissolved in oil according to claim 7, wherein the volume fraction prediction formula is calculated by:
according to the volume fraction of the gas component in the gas chamber during the membrane separation of the dissolved gas in the oil:
wherein b is the diffusion coefficient; t is the time after the start of permeation; ciIs the volume fraction of the gas component in the gas cell at t;
obtaining a first time point t under the non-equilibrium staten-1Volume fraction of gas component in time gas chamber and second time point tnThe relationship between the volume fractions of the gas components in the time gas chamber:
where, t isn-tn-1；Ci(n-1)Is tn-1The volume fraction of the gas component in the time gas chamber; cinIs tnThe volume fraction of the gas component in the time gas chamber;
obtaining an intermediate calculation formula according to the relation formula:
where, t isn-tn-1＝tn+1-tn；Ci(n+1)Is a third time point tn+1The volume fraction of the gas component in the time gas chamber;
and simplifying the intermediate calculation formula to obtain the volume fraction prediction formula.
9. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1 to 5 when executing the computer program.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 5.
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| CN201810106909.3A CN108229095A (en) | 2018-02-02 | 2018-02-02 | The Forecasting Methodology and terminal device of oil dissolved gas volume fraction |
| KR1020197036276A KR20200006559A (en) | 2018-02-02 | 2018-07-02 | Method and terminal device for volume fraction prediction of dissolved gas in oil |
| JP2019563746A JP2020521230A (en) | 2018-02-02 | 2018-07-02 | Prediction method of dissolved gas volume fraction in oil and terminal device |
| PCT/CN2018/093971 WO2019148766A1 (en) | 2018-02-02 | 2018-07-02 | Method for predicting volume fraction of dissolved gas in oil, and terminal device |
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| KR (1) | KR20200006559A (en) |
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| FR2811430B1 (en) * | 2000-07-10 | 2002-09-06 | Inst Francais Du Petrole | MODELING METHOD FOR PREDICTING AS A FUNCTION OF TIME THE DETAILED COMPOSITION OF FLUIDS PROVIDED BY AN UNDERGROUND DEPOSIT DURING PRODUCTION |
| CN106645531B (en) * | 2016-12-21 | 2018-09-21 | 国网河北省电力公司电力科学研究院 | A kind of modification method of Gases Dissolved in Transformer Oil detection data |
| CN108229095A (en) * | 2018-02-02 | 2018-06-29 | 华北理工大学 | The Forecasting Methodology and terminal device of oil dissolved gas volume fraction |
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| Title |
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| 李洋流等: "基于膜分离的变压器在线监测系统中气体体积分数的预测算法", 《电力自动化设备》 * |
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| WO2019148766A1 (en) * | 2018-02-02 | 2019-08-08 | 华北理工大学 | Method for predicting volume fraction of dissolved gas in oil, and terminal device |
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