CN109408878B - Method, device, equipment and medium for realizing field coupling - Google Patents
Method, device, equipment and medium for realizing field coupling Download PDFInfo
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Abstract
The invention discloses a method for realizing one-field coupling, which comprises the steps of obtaining a circuit model of a harmonic circuit and an arc model of a circuit breaker in the harmonic circuit; the harmonic circuit is a circuit for inputting harmonic excitation; acquiring component parameters of the circuit model at the initial moment and arc current in the component parameters according to preset duration and step length; the component parameters comprise voltage and current of the component; acquiring the arc voltage of the arc model in the step length according to the arc current and the initial arc impedance; updating the arc impedance according to the arc voltage and the arc current; based on the circuit model, updating the component parameters and the arc currents in the component parameters according to the component parameters and the updated arc impedance until iteration reaches the preset iteration step number, and realizing field path coupling.
Description
Technical Field
The present invention relates to the field of electric power systems, and in particular, to a method, an apparatus, a device, and a medium for implementing field coupling.
Background
The converter device used in the hvdc transmission is a typical nonlinear electronic device, which generates various harmonics including characteristic harmonics and non-characteristic harmonics on the ac-dc side of the converter transformer during the power transmission. The harmonic wave has important influence on the type selection and safe and stable operation of the circuit breaker, and the current which is switched on and off by the circuit breaker is not sinusoidal due to the harmonic wave of the system, so that the amplitude and the change rate of the recovery voltage between the contacts and the medium recovery strength between the contacts are influenced by di/dt. If the amplitude of the recovery voltage is raised, the recovery strength of the medium between the contacts is exceeded, or the recovery voltage change rate is too high, and exceeds the recovery speed of the insulation strength between the contacts after arc extinction, the fracture can be broken down by the recovery voltage, the arc can reburning, switching or breaking failure is caused, and a breaker fault or a power failure accident of a power grid can be caused in serious cases.
Since the 90 s of the last century, a great deal of research work was developed by students at home and abroad on arc simulation. In recent years, along with popularization of commercial software, on the basis of theoretical research, a magnetohydrodynamic method is already applied to optimization of a nozzle structure of an actual product of an SF6 circuit breaker, and at present, arc simulation is carried out, particularly in field-circuit joint coupling simulation research for realizing circuit and arc opening, an applied alternating current or direct current source is a static power supply, influence of system parameters of the whole power transmission system on arc input current is not considered, particularly under the condition that harmonic exists in the system, the harmonic wave can influence the system parameters, and further the system parameters influence the arc input current, so that errors exist in the field-circuit joint coupling simulation research for realizing the arc opening.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a method for implementing field coupling, which can accurately implement field coupling in consideration of system parameters.
In a first aspect, the present invention provides a method for implementing one-field coupling, including:
acquiring a circuit model of a harmonic circuit and an arc model of a circuit breaker in the harmonic circuit; the harmonic circuit is a circuit for inputting harmonic excitation;
acquiring component parameters of the circuit model at the initial moment and arc current in the component parameters according to preset duration and step length; the component parameters comprise voltage and current of the component;
acquiring the arc voltage of the arc model in the step length according to the arc current and the initial arc impedance;
updating the arc impedance according to the arc voltage and the arc current;
based on the circuit model, updating the component parameters and the arc currents in the component parameters according to the component parameters and the updated arc impedance until iteration reaches the preset iteration step number.
In a first possible implementation manner of the first aspect, the acquiring, according to a preset duration and step length, a component parameter of the circuit model at an initial time and an arc current in the component parameter; the component parameters comprise voltage and current of components and the components, and the components comprise:
according to the preset duration and step length, calculating and obtaining component parameters in the circuit model at different initial moments in the preset duration;
and taking the initial arcing time of the circuit breaker as an initial time, and acquiring corresponding component parameters in the circuit model and arc currents in the component parameters.
With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the calculating, according to a preset duration and a step length, component parameters in the circuit model at different initial moments within the preset duration includes:
acquiring preset impedance;
and calculating and obtaining component parameters in the circuit model at different initial moments in the preset time according to the preset time, the step length and the impedance.
In a third possible implementation manner of the first aspect, the arc model is obtained by solving a mass conservation equation, a momentum conservation equation, an energy equation and a maxwell equation simultaneously according to finite element analysis.
In a fourth possible implementation manner of the first aspect, the method further includes: and storing the component parameters of the circuit model, the arc current in the component parameters and the arc impedance in a preset file.
In a second aspect, the present invention further provides a device for implementing field coupling, including:
the model acquisition module is used for acquiring a circuit model of the harmonic circuit and an arc model of a circuit breaker in the harmonic circuit; the harmonic circuit is a circuit for inputting harmonic excitation;
the current acquisition module is used for acquiring component parameters of the circuit model at the initial moment and arc current in the component parameters according to preset duration and step length; the component parameters comprise voltage and current of the component;
the arc voltage acquisition module is used for acquiring the arc voltage of the arc model in the step length according to the arc current and the initial arc impedance;
the arc impedance acquisition module is used for updating the arc impedance according to the arc voltage and the arc current;
and the updating module is used for updating the component parameters and the arc currents in the component parameters according to the component parameters and the updated arc impedance based on the circuit model until iteration reaches the preset iteration step number.
In a first possible implementation manner of the second aspect, the current acquisition module includes:
the parameter calculation unit is used for calculating and obtaining component parameters in the circuit model at different initial moments in the preset time length according to the preset time length and the step length;
the current acquisition unit is used for taking the initial arcing time of the circuit breaker as an initial time to acquire corresponding component parameters in the circuit model and arc currents in the component parameters.
With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the parameter calculation unit includes:
acquiring preset impedance;
and calculating and obtaining component parameters in the circuit model at different initial moments in the preset time according to the preset time, the step length and the impedance.
In a third aspect, an embodiment of the present invention further provides a field coupling implementation apparatus, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, where the processor executes the computer program to implement a method for implementing field coupling according to any one of the above.
In a fourth aspect, an embodiment of the present invention further provides a computer readable storage medium, where the computer readable storage medium includes a stored computer program, where when the computer program runs, the device where the computer readable storage medium is controlled to execute the implementation method of field path coupling described in any one of the foregoing steps.
One of the above technical solutions has the following advantages: acquiring a circuit model of a harmonic circuit and an arc model of a circuit breaker in the harmonic circuit; the harmonic circuit is a circuit for inputting harmonic excitation; acquiring component parameters of the circuit model at the initial moment and arc current in the component parameters according to preset duration and step length; the component parameters comprise voltage and current of the component; acquiring the arc voltage of the arc model in the step length according to the arc current and the initial arc impedance; updating the arc impedance according to the arc voltage and the arc current; based on the circuit model, updating the component parameters and the arc currents in the component parameters according to the component parameters and the updated arc impedance until iteration reaches the preset iteration step number. The influence on circuit parameters under harmonic excitation is considered, a circuit model under the harmonic excitation is obtained, and field coupling is realized through calling and calculation between parameters of the two models.
Drawings
FIG. 1 is a schematic diagram of a field coupling implementation device according to a first embodiment of the present invention;
fig. 2 is a flow chart of a method for implementing one-field coupling according to the second embodiment of the present invention;
FIG. 3 is a schematic diagram of a physical process in an arc plasma according to a second embodiment of the present invention;
fig. 4 is a schematic circuit topology diagram according to a second embodiment of the present invention;
fig. 5 is a schematic structural diagram of a field coupling implementation device according to a third embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Those skilled in the art will appreciate that the present invention may be implemented as an apparatus, method, or computer program product. Accordingly, the present disclosure may be embodied in the following forms, namely: either entirely hardware, entirely software (including firmware, resident software, micro-code, etc.), or entirely software, or a combination of hardware and software, referred to herein generally as a "circuit," module "or" system. Furthermore, in some embodiments, the invention may also be embodied in the form of a computer program product in one or more computer-readable media, which contain computer-readable program code.
Any combination of one or more computer readable media may be employed. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).
The present invention is described below with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a virtual machine, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable medium that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable medium produce an article of manufacture including instruction means which implement the function/act specified in the flowchart and/or block diagram block or blocks.
The computer program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks.
Example 1
Referring to fig. 1, fig. 1 is a schematic diagram of a field coupling implementation device according to an embodiment of the present invention, which is configured to execute a field coupling implementation method according to an embodiment of the present invention, as shown in fig. 1, where the field coupling implementation device includes: at least one processor 11, such as a CPU, at least one network interface 14 or other user interface 13, a memory 15, at least one communication bus 12, the communication bus 12 being for enabling connected communication between these components. The user interface 13 may optionally include a USB interface, as well as other standard interfaces, wired interfaces. The network interface 14 may optionally include a Wi-Fi interface, as well as other wireless interfaces. The memory 15 may comprise a high-speed RAM memory or may further comprise a non-volatile memory (non-volatile memory), such as at least one disk memory. The memory 15 may optionally comprise at least one memory device located remotely from the aforementioned processor 11.
In some embodiments, the memory 15 stores the following elements, executable modules or data structures, or a subset thereof, or an extended set thereof:
an operating system 151 containing various system programs for implementing various basic services and handling hardware-based tasks;
Specifically, the processor 11 is configured to invoke the program 152 stored in the memory 15 to execute the implementation method of the field coupling described in the following embodiments.
The processor may be a central processing unit (Central Processing Unit, CPU), other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, which is a control center of the implementation method of field coupling, and various interfaces and lines are used to connect the various parts of the overall implementation method of field coupling.
The memory may be used to store the computer program and/or modules, and the processor may implement various functions of the field-coupled implemented electronic device by running or executing the computer program and/or modules stored in the memory, and invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program (such as a sound playing function, a text conversion function, etc.) required for at least one function, and the like; the storage data area may store data (such as audio data, text message data, etc.) created according to the use of the cellular phone, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart Media Card (SMC), secure Digital (SD) Card, flash Card (Flash Card), at least one disk storage device, flash memory device, or other volatile solid-state storage device.
Wherein the integrated modules of the field coupling may be stored in a computer readable storage medium if implemented in the form of software functional units and sold or used as a stand alone product. Based on this understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and the computer program may implement the steps of each method embodiment described above when executed by a processor. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable medium contains content that can be appropriately scaled according to the requirements of jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is subject to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.
A method of implementing field coupling according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
Example two
Fig. 2 is a flow chart of implementation of one-way coupling according to the second embodiment of the present invention.
A method of implementing a field coupling, comprising the steps of:
s11, acquiring a circuit model of a harmonic circuit and an arc model of a circuit breaker in the harmonic circuit; the harmonic circuit is a circuit for inputting harmonic excitation;
s12, acquiring component parameters of the circuit model at the initial moment and arc current in the component parameters according to preset duration and step length; the component parameters comprise voltage and current of the component;
s13, acquiring the arc voltage of the arc model in the step length according to the arc current and the initial arc impedance;
s14, updating the arc impedance according to the arc voltage and the arc current;
and S15, updating the component parameters and the arc currents in the component parameters based on the circuit model according to the component parameters and the updated arc impedance until iteration reaches a preset iteration step number.
In the embodiment of the invention, to realize field coupling, an arc model and a circuit model are required to be established first.
In embodiments of the present invention, an iteration is an activity of repeating a feedback process, typically for the purpose of approximating a desired target or result. Each repetition of the process is referred to as an "iteration," and the result from each iteration is used as the initial value for the next iteration. The process of sequentially determining the subsequent quantities from the previous quantities is repeated by executing a series of calculation steps. Each result of this process is obtained by performing the same operation step on the result obtained in the previous time. After the parameters of both the arc model and the circuit model are updated, an iteration is completed.
Preferably, the arc model is obtained by simultaneously solving a conservation of mass equation, a conservation of momentum equation, an energy equation and a maxwell equation according to finite element analysis.
The establishment of the arc model is detailed below:
during the opening of the contacts of the circuit breaker, a high-temperature conductive gas, so-called arc plasma, is formed between the contacts. The arc plasma has temperature field, airflow field, electric field and magnetic field, and the mathematical expression equation of the temperature field, airflow field, electric field and magnetic field are coupled via relevant parameters, and the coupling relation is shown in figure 3. The mutual coupling of the temperature field and the air flow field of the electric arc is realized mainly by the influence on physical parameters and the energy transportation process. The temperature and electric fields of the arc are coupled to each other primarily by joule heating and conductivity. The lorentz force caused by the electromagnetic field can act on the electric arc gas flow field and directly participate in the calculation of a momentum equation as a volume force, so that the coupling of the electromagnetic field and the gas flow field is realized. In addition, in order to take into account the influence of different switching speeds, the change in the calculated area caused by the movement of the contact must be taken into account in the calculation of the arc in order to achieve the coupling between the contact movement process and the arc temperature field, the airflow field, the electric field and the magnetic field.
The inventors have found that the physical process shown in fig. 3 can be described by a magnetohydrodynamic equation, which mainly includes three basic equations of fluid mechanics and electromagnetic field equations.
The magnetohydrodynamic equation includes a mass conservation equation, a momentum conservation equation, and an energy conservation equation as follows.
Mass conservation equation:
the magnetohydrodynamic equation is the same in equation form in any kind of fluid. In the formula (1), ρ represents the gas density, and u represents the velocity vector of the fluid. First item in
For the change of mass over time, second item +.>
The mass is kept to be constant under the combined action of the gas flow and the mass change caused by the gas flow.
Momentum conservation equation:
in the formula (2), p represents a gas pressure, τ represents a tensor, j represents a current density vector, and B represents a magnetic flux density. For the conservation of momentum equation, the left side of equation (2)
And->
Describes the time-varying and convection processes of momentum, respectively, right side of equation (2)>
And->
The change in momentum due to the longitudinal pressure distribution of the fluid layer and the change in transverse shear force due to the viscosity of the fluid are described respectively. In the arc magnetic fluid, the Lorentz of the fluid in the electromagnetic field needs to be considered, namely the last term of the formula (2)>
Energy equation:
k in the formula (3) represents thermal conductivity; t is the fluid temperature; e is energy, the energy comprises the internal energy and the kinetic energy of the fluid, the internal energy of the fluid is an enthalpy value, and the calculation of the enthalpy value is greatly different from that of the normal-temperature fluid in an electric arc. Since there are a large number of chemical reactions inside the arc, the composition of the gas is no longer a single SF6 gas, but is made up of a large number of atoms, molecules and charged particles, and the calculation of the enthalpy value is represented by equation (5) of the energy equation described above, mainly comprising the translational enthalpy (the translational energy of each particle at a certain temperature), the internal enthalpy (the energy formed by the energy of each particle's own energy distribution), and the formation enthalpy (the energy formed by each particle after the chemical reaction). In the formula (5), Z j Representing the partitioning function of the particle j, which characterizes the distribution of the different energy levels of the particle j, can be obtained from the literature, and is not described in detail herein, Y j Representing the mass fraction of particles j.
The left side of equation (3) is also defined by the time-varying term
And convection item->
The composition is formed. Right side of formula (3)
Indicating the heat conduction process inside the arc, +.>
Indicating the change in energy due to frictional heating between the fluid layers. The last two terms on the right side of equation (3) are specific to the arc fluid, respectively: p (P) rad Intense radiation dissipation, σE, for the photothermal effect of the arc 2 Joule heat input under the action of the current.
The electromagnetic field equation is the maxwell equation:
in the above-mentioned formula(s),
is the magnetic flux density vector/T->
Is the current density vector/A.m -3 ，/>
Is the electric field intensity vector/V.m -1 ，/>
Is potential/V, sigma is conductivity/s.m -1 ，μ 0 The vacuum relative magnetic conductivity is 1, A r And A z Is a component of the magnetic vector in the radial and axial directions.
According to finite element analysis, the arc characteristics of the circuit breaker can be obtained by combining the mass conservation equation, the momentum conservation equation, the energy conservation equation and the Maxwell equation, and then an arc model is obtained.
The circuit model is built in detail below, and the automatic building, solving and data storage of the circuit model are realized by utilizing an analytical command stream in a ANSYS Multiphysics module, wherein the ANSYS Multiphysics module is a multi-physical-field simulation module, the exemplary built circuit model is shown in fig. 4, V1 and V2 are power frequency and harmonic voltage sources respectively, R5 and R6 are fracture resistances of double fractures respectively, C3 and C4 are fracture parallel capacitors, R3 and R4 are fracture arcing impedances, R2 is a breaker post impedance, and a filter is arranged in a red frame. R3 and R4 initial impedance value setting 1e -5 And calculating and solving the component parameters of the circuit model and the arc current flowing through the circuit breaker by utilizing an analysis command stream in the multi-physical-field simulation module, namely, the conducting state.
Preferably, the component parameters of the circuit model at the initial moment and the arc current in the component parameters are obtained according to the preset duration and step length; the component parameters comprise voltage and current of components and the components, and the components comprise:
according to the preset duration and step length, calculating and obtaining component parameters in the circuit model at different initial moments in the preset duration;
and taking the initial arcing time of the circuit breaker as an initial time, and acquiring corresponding component parameters in the circuit model and arc currents in the component parameters.
Further, the calculating, according to the preset duration and step length, component parameters in the circuit model at different initial moments within the preset duration includes:
acquiring preset impedance;
and calculating and obtaining component parameters in the circuit model at different initial moments in the preset time according to the preset time, the step length and the impedance.
Further, the method further comprises the following steps: and storing the component parameters of the circuit model, the arc current in the component parameters and the arc impedance in a preset file.
It should be noted that, the step length calculated by the multi-physical field simulation module is consistent with the calculation step length of the arc model, and the control time step length is consistent to realize mutual iterative calculation of arc model simulation and circuit model simulation, so as to achieve the purpose of simultaneous calculation.
Specifically, firstly, an arc model of a circuit breaker to be researched and a circuit model of a circuit system where the circuit breaker is located are obtained, the arc model is built in Fluent software, the circuit model is built in the multi-physical-field simulation module, an analysis command stream in the multi-physical-field simulation module is called to realize the circuit model building, a preset impedance is given to the circuit model, the circuit model is simulated under input harmonic excitation, component parameters in the circuit model at different initial moments in the preset time are calculated and obtained according to the preset time length, step length and the preset impedance, circuit model solving can be realized by calling an analysis command stream in the multi-physical-field simulation module, component parameters Q0 in the circuit model and arc current A0 in the component parameters taking the initial arcing moment of the circuit breaker as the initial moment are obtained, the component parameters Q0 corresponding to the initial arcing moment and the arc current A0 in the component parameters are input into preset files, for example, the component parameters Q0 and the arc current A0 in the component parameters are added into the files and the current 1. Xtfile are updated to the same time length and the current 1. Xtfile is added to the current 1. Xtfile, and the current is automatically calculated and the current is added to the current 1. Xtfile is updated after the current is added to the current 1. Xtfile is updated. Initializing arc impedance R0 when the Fluent software calculates an open-close arc process, reading an arc current A0 corresponding to the initial arcing moment, namely calling a current value in a current_1.txt file, inputting the initial arc current value A0 into an arc model of the circuit breaker, simulating the opening process of a contact of the circuit breaker to obtain an arc voltage V0, simulating the opening process of the contact of the circuit breaker by using a movable grid technology, calculating a step length to obtain a converged arc voltage V0, calculating a ratio of the arc voltage V0 to the arc current A0 corresponding to the initial arcing moment to obtain a new arc impedance R1, updating the arc impedance R1 and storing the new arc impedance R1 in a preset file, updating and storing the arc impedance R1 in the 1.txt file, automatically updating and storing the arc impedance in the preset file in subsequent calculation, starting the ANSYS Multiphysics module automatically through a program, for example, starting the ANSYS Multiphysics module by calling a '123.bat' in a system, calling a component parameter Q0 and updated arc impedance R1 in the 1.txt by the ANSYS Multiphysics module, performing simulation calculation according to the component parameter Q0 and the updated arc impedance R1, updating the component parameter Q0 and an arc current A0 in the component parameter to obtain a new component parameter Q1 and an arc current A1 in the component parameter, detecting that the current iteration does not reach the preset iteration step number, reading the updated arc current A1 in the current_1.txt file by the arc model in the Fluent software, reading the updated arc impedance R1 in the 1.txt, performing voltage calculation according to the arc current A1 and the updated arc impedance R1 in the previous iteration, the updated arc voltage V1 is obtained, the arc impedance R1 is updated according to the calculated arc voltage V1 and the arc current A1 to obtain new arc impedance R2, the arc current A1 in the component parameter Q1 and the component parameter is updated according to the component parameter Q1 and the updated arc impedance R2 based on the circuit model, the new component parameter Q2 and the arc current A2 in the component parameter are obtained until iteration reaches the preset iteration step number, the repeated iteration calculation of the two modules Fluent and ANSYS Multiphysics is realized, and further the field coupling calculation is realized.
The implementation of the embodiment has the following beneficial effects:
firstly, acquiring a circuit model of a harmonic circuit and an arc model of a circuit breaker in the harmonic circuit; the harmonic circuit is a circuit for inputting harmonic excitation; acquiring component parameters of the circuit model at the initial moment and arc current in the component parameters according to preset duration and step length; the component parameters comprise voltage and current of the component; acquiring the arc voltage of the arc model in the step length according to the arc current and the initial arc impedance; updating the arc impedance according to the arc voltage and the arc current; based on the circuit model, updating the component parameters and the arc currents in the component parameters according to the component parameters and the updated arc impedance until iteration reaches the preset iteration step number. The influence on circuit parameters under harmonic excitation is considered, a circuit model under the harmonic excitation is obtained, and field coupling is realized through calling and calculation between parameters of the two models.
Example III
Referring to fig. 5, a schematic structural diagram of a field coupling implementation apparatus according to a third embodiment of the present invention is provided;
an implementation apparatus for field coupling, comprising:
a model acquisition module 31, configured to acquire a circuit model of a harmonic circuit and an arc model of a circuit breaker in the harmonic circuit; the harmonic circuit is a circuit for inputting harmonic excitation;
the current obtaining module 32 is configured to obtain a component parameter of the circuit model at an initial time and an arc current in the component parameter according to a preset duration and step length; the component parameters comprise voltage and current of the component;
an arc voltage obtaining module 33, configured to obtain an arc voltage of the arc model in the step size according to the arc current and the initial arc impedance;
an arc impedance acquisition module 34 for updating the arc impedance according to the arc voltage and the arc current;
and an updating module 35, configured to update the component parameter and the arc current in the component parameter according to the component parameter and the updated arc impedance based on the circuit model until iteration reaches a preset iteration step number.
Preferably, the current acquisition module 32 includes:
the parameter calculation unit is used for calculating and obtaining component parameters in the circuit model at different initial moments in the preset time length according to the preset time length and the step length;
the current acquisition unit is used for taking the initial arcing time of the circuit breaker as an initial time to acquire corresponding component parameters in the circuit model and arc currents in the component parameters.
Preferably, the parameter calculation unit includes:
acquiring preset impedance;
and calculating and obtaining component parameters in the circuit model at different initial moments in the preset time according to the preset time, the step length and the impedance.
Preferably, the arc model is obtained by simultaneously solving a conservation of mass equation, a conservation of momentum equation, an energy equation and a maxwell equation according to finite element analysis.
Preferably, the method further comprises: and storing the component parameters of the circuit model, the arc current in the component parameters and the arc impedance in a preset file.
The implementation of the embodiment has the following beneficial effects:
acquiring a circuit model of a harmonic circuit and an arc model of a circuit breaker in the harmonic circuit; the harmonic circuit is a circuit for inputting harmonic excitation; acquiring component parameters of the circuit model at the initial moment and arc current in the component parameters according to preset duration and step length; the component parameters comprise voltage and current of the component; acquiring the arc voltage of the arc model in the step length according to the arc current and the initial arc impedance; updating the arc impedance according to the arc voltage and the arc current; based on the circuit model, updating the component parameters and the arc currents in the component parameters according to the component parameters and the updated arc impedance until iteration reaches the preset iteration step number. The influence on circuit parameters under harmonic excitation is considered, a circuit model under the harmonic excitation is obtained, and field coupling is realized through calling and calculation between parameters of the two models.
It should be noted that the above-described apparatus embodiments are merely illustrative, and the units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the drawings of the embodiment of the device provided by the invention, the connection relation between the modules represents that the modules have communication connection, and can be specifically implemented as one or more communication buses or signal lines. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
In the foregoing embodiments, the descriptions of the embodiments are focused on, and for those portions of one embodiment that are not described in detail, reference may be made to the related descriptions of other embodiments. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred embodiments, and that the actions and simulations referred to are not necessarily required for the present invention.
Claims (6)
1. A method for implementing field coupling, comprising:
acquiring a circuit model of a harmonic circuit and an arc model of a circuit breaker in the harmonic circuit; the harmonic circuit is a circuit for inputting harmonic excitation;
acquiring component parameters of the circuit model at the initial moment and arc current in the component parameters according to preset duration and step length; the component parameters comprise voltage and current of the component;
acquiring the arc voltage of the arc model in the step length according to the arc current and the initial arc impedance;
updating the arc impedance according to the arc voltage and the arc current;
updating the component parameters and the arc currents in the component parameters according to the component parameters and the updated arc impedance based on the circuit model until iteration reaches a preset iteration step number;
acquiring component parameters of the circuit model at the initial moment and arc current in the component parameters according to preset duration and step length; the component parameters comprise voltage and current of components and the components, and the components comprise:
according to the preset time length and the step length, calculating and obtaining component parameters in the circuit model at different initial moments in the preset time length;
taking the initial arcing time of the circuit breaker as an initial time, and acquiring corresponding component parameters in the circuit model and arc currents in the component parameters;
according to the preset time length and the step length, calculating and obtaining the component parameters in the circuit model at different initial moments in the preset time length comprises the following steps:
acquiring preset impedance;
and calculating and obtaining component parameters in the circuit model at different initial moments in the preset time according to the preset time, the step length and the preset impedance.
2. The method according to claim 1, wherein the arc model is obtained by solving a conservation of mass equation, a conservation of momentum equation, an energy equation and maxwell's equations simultaneously according to finite element analysis.
3. The method for implementing field coupling according to claim 1, further comprising: and storing the component parameters of the circuit model, the arc current in the component parameters and the arc impedance in a preset file.
4. An implementation apparatus for field coupling, comprising:
the model acquisition module is used for acquiring a circuit model of the harmonic circuit and an arc model of a circuit breaker in the harmonic circuit; the harmonic circuit is a circuit for inputting harmonic excitation;
the current acquisition module is used for acquiring component parameters of the circuit model at the initial moment and arc current in the component parameters according to preset duration and step length; the component parameters comprise voltage and current of the component;
the arc voltage acquisition module is used for acquiring the arc voltage of the arc model in the step length according to the arc current and the initial arc impedance;
the arc impedance acquisition module is used for updating the arc impedance according to the arc voltage and the arc current;
the updating module is used for updating the component parameters and the arc currents in the component parameters according to the component parameters and the updated arc impedance based on the circuit model until iteration reaches the preset iteration step number;
the current acquisition module includes:
the parameter calculation unit is used for calculating and obtaining component parameters in the circuit model at different initial moments in the preset time length according to the preset time length and the step length;
the current acquisition unit is used for taking the initial arcing time of the circuit breaker as an initial time to acquire corresponding component parameters in the circuit model and arc currents in the component parameters;
the parameter calculation unit includes:
acquiring preset impedance;
and calculating and obtaining component parameters in the circuit model at different initial moments in the preset time according to the preset time, the step length and the preset impedance.
5. A field coupling implementing device comprising a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, the processor implementing the field coupling implementing method according to any one of claims 1 to 3 when the computer program is executed.
6. A computer readable storage medium, characterized in that the computer readable storage medium comprises a stored computer program, wherein the computer program, when run, controls a device in which the computer readable storage medium is located to perform the method of implementing the field coupling according to any of claims 1 to 3.
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