CN110110361B - Electric field simulation method and device for flexible direct current converter valve tower and storage medium - Google Patents
Electric field simulation method and device for flexible direct current converter valve tower and storage medium Download PDFInfo
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- CN110110361B CN110110361B CN201910239849.7A CN201910239849A CN110110361B CN 110110361 B CN110110361 B CN 110110361B CN 201910239849 A CN201910239849 A CN 201910239849A CN 110110361 B CN110110361 B CN 110110361B
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Abstract
The invention discloses an electric field simulation method of a flexible direct current converter valve tower, which comprises the following steps: determining a key part according to the structure of a valve tower of the flexible direct-current converter valve; establishing a flexible direct-current converter valve tower simulation model, and simplifying according to key parts; subdividing the valve tower simplified model; determining dielectric constants and resistivities of different materials, and applying the dielectric constants and resistivities to a waterway part of the valve tower subdivision model; extracting alternating current and direct current composite voltage, and carrying out sectional loading; and (4) acquiring the electric field strengths of different moments by adopting a calculation method of the whole-period transient field. The invention discloses an electric field simulation method of a flexible direct current converter valve tower, which considers the actual operation condition of the flexible direct current converter valve tower, can take the mutual influence between a water path and the valve tower into account, and improves the accuracy of the whole electric field distribution of the flexible direct current converter valve tower in simulation calculation. The invention also discloses an electric field simulation device and a storage medium of the flexible direct current converter valve tower.
Description
Technical Field
The invention relates to the technical field of simulation, in particular to an electric field simulation method and device for a flexible direct current converter valve tower and a storage medium.
Background
The flexible direct current converter valve is a core component in an extra-high voltage flexible direct current transmission project converter station, and the operation condition of the flexible direct current converter valve is very complex. In order to verify the reasonability of the electromagnetic design of the flexible direct current converter valve and ensure the reliability and stability of equipment operation, a numerical simulation model of a flexible direct current converter valve tower needs to be established.
In the prior art, a method for carrying out simulation research on a flexible direct current converter valve tower comprises the following steps: and performing simulation calculation by adopting an electrostatic field solver, and calculating to obtain an electric field distribution rule under the operation condition by applying an alternating current or alternating current/direct current voltage maximum amplitude value.
The inventor finds that the following technical problems exist in the prior art in the process of implementing the invention:
under the normal operation condition, the operation voltage contains a large amount of AC/DC components and partial high-frequency voltage components, so that the accuracy of the simulation result of simulation calculation by adopting an electrostatic field solver is low; in addition, influence relation between a water path and a valve tower is not considered, and limitation exists.
Disclosure of Invention
The embodiment of the invention provides an electric field simulation method for a flexible direct-current converter valve tower, which can take mutual influence between a water path and the valve tower into consideration and improve the accuracy of simulation calculation on the whole electric field distribution of the flexible direct-current converter valve tower.
The embodiment of the invention provides an electric field simulation method for a valve tower of a flexible direct-current converter valve, which comprises the following steps:
determining a key part according to the structure of a valve tower of the flexible direct-current converter valve;
establishing the flexible direct-current converter valve tower simulation model, and simplifying the flexible direct-current converter valve tower simulation model according to the key parts to obtain a valve tower simplified model;
subdividing the valve tower simplified model to obtain a valve tower subdivision model;
determining corresponding dielectric constant and resistivity according to the material of the flexible direct current converter valve tower, and inputting the dielectric constant and the resistivity to a waterway part of the valve tower subdivision model;
extracting actual running alternating current-direct current composite voltage at a clamping point in the valve tower subdivision model, and carrying out sectional loading;
and calculating the electric field distribution in the valve tower subdivision model at different moments in a period by adopting a calculation method of a whole period transient field to obtain the electric field strength at different moments.
As an improvement of the above scheme, the key parts include: one or more of a voltage-sharing shielding cover, a clamp point, a group component connecting part, a tip part and a protruding part in the flexible direct current converter valve tower structure are combined.
As an improvement of the above scheme, the simplifying the flexible direct current converter valve tower simulation model according to the key part specifically includes:
the valve tower simulation model reserves an external voltage-sharing shielding cover, a power module, a clamp point, a water path, an optical fiber pipeline, a supporting insulator at the lower end of the valve tower and an insulator for supporting the power module, and the lower end of the valve tower supports a voltage-sharing shielding ring at the middle connection part of the insulator;
simplifying the power module into a regular solid cuboid;
simplifying the insulator into a cylinder;
and filling or annular shielding rings are carried out on the closed hollow pipe.
As an improvement of the above scheme, the subdividing the valve tower simplified model specifically includes:
carrying out grid refinement on the key attention area, and subdividing by adopting a tetrahedral small-size grid;
roughly dividing the part with uniform electric field change and relatively small electric field intensity by adopting a large-size grid;
and (4) subdividing the components with regular shapes by adopting a sweeping method and adopting hexahedral meshes.
As an improvement of the above scheme, the extracting an actual operation alternating current-direct current composite voltage at a clamping point in the valve tower subdivision model, and performing segment loading includes:
representing the actual running AC/DC composite voltage U (t) at different clamping points as a DC voltage component U dc Fundamental frequency ac voltage component u 1ac And a high frequency voltage component u hac As shown in the following formula (1):
u(t)＝U dc +u 1ac (t)+u hac (t) (1)
selecting a time-varying voltage waveform of one period in the actually-operated alternating current-direct current composite voltage waveform, and performing discretization processing; selecting discrete point voltage to be applied to corresponding clamping points, voltage-sharing shielding cases connected with the clamping points and power modules;
and carrying out electric field segmented loading on each clamping point by adopting a time domain discrete waveform.
As an improvement of the above scheme, the extracting an actual operation alternating current-direct current composite voltage at a clamping point in the valve tower subdivision model, and performing segment loading includes:
applying voltage waveforms shown in the following formula (2) to the corresponding clamping points, voltage-sharing shielding cover parts connected with the clamping points and power module parts;
in the formula of U 1m And theta 1 Respectively, the amplitude and phase angle, U, of the fundamental voltage component im And theta i The amplitude and the phase angle of the ith harmonic voltage component are respectively, and n is the total harmonic frequency; u shape dc The direct current voltage component of the actual running alternating current-direct current composite voltage u (t) at different clamping points is obtained;
and carrying out electric field segmented loading on each clamping point by adopting frequency domain waveforms.
As an improvement of the above scheme, the calculating method using a full-period transient field calculates electric field distributions in the valve tower subdivision model at different times in a period to obtain electric field strengths at different times, and specifically includes:
a finite element calculation result matrix of the overall potential distribution in the valve tower of the flexible direct current converter station
Expressed as a direct current component
And an alternating current component
And (3) below:
setting the alternating-current component of the voltage waveform of the valve tower of the flexible direct-current converter station as shown in the following formula (4):
u ac-i (t)＝U o k ac-i (t) (4)
in the formula of U o Is a standard voltage constant; k is a radical of formula ac-i (t) is the time varying proportionality coefficient of the alternating current component of the corresponding voltage waveform;
according to the superposition principle, the grid unit calculation result matrix of the integral potential capacitive distribution at the time t
Represented by the following formula (5):
in a running period of the converter station direct current field, a grid unit calculation result matrix of the overall steady-state potential distribution at the time t can be obtained from the formula (3)
As shown in the following formula (6):
for the matrix
And carrying out scaling and matrix addition and subtraction operation on the obtained result according to the proportional coefficient of the loaded voltage waveform to obtain the electric field distribution in the valve tower subdivision model at different moments in a period.
Correspondingly, an embodiment of the present invention provides an electric field simulation apparatus for a valve tower of a flexible dc converter valve, including:
the key part determining unit is used for determining a key part according to the structure of the flexible direct-current converter valve tower;
the model simplifying unit is used for establishing the flexible direct current converter valve tower simulation model and simplifying the flexible direct current converter valve tower simulation model according to the key parts to obtain a valve tower simplified model;
the model subdivision unit is used for subdividing the valve tower simplified model to obtain a valve tower subdivision model;
the variable applying unit is used for determining corresponding dielectric constant and resistivity according to the material of the flexible direct current converter valve tower, and inputting the dielectric constant and the resistivity to a waterway part of the valve tower subdivision model;
the segmented loading unit is used for extracting the actual running alternating current-direct current composite voltage at a clamping point in the valve tower subdivision model and carrying out segmented loading;
and the electric field calculation unit is used for calculating the electric field distribution in the valve tower subdivision model at different moments in a period by adopting a calculation method of a whole-period transient field, and obtaining the electric field intensity at different moments.
Correspondingly, the third embodiment of the invention provides an electric field simulation device for a valve tower of a flexible direct-current converter valve, which comprises: the system comprises a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, wherein the processor executes the computer program to realize the electric field simulation method of the flexible direct current converter valve tower according to the first embodiment of the invention.
Correspondingly, the fourth embodiment of the present invention provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, and when the computer program runs, the apparatus where the computer-readable storage medium is located is controlled to execute the method for simulating an electric field of a flexible direct current converter valve tower according to the first embodiment of the present invention.
The electric field simulation method for the valve tower of the flexible direct current converter valve provided by the embodiment of the invention has the following beneficial effects:
the simulation model is simplified by determining the key part in the valve tower, so that the influence of the umbrella skirt of the supporting insulator can be ignored, the influence of small parts on the whole potential distribution can be ignored, and the pertinence of simulation calculation is improved; the grid of the key attention area is refined, and the other parts are roughly divided, so that the grid division is prevented from being complicated; the influence of the waterway part on the whole electric field of the valve tower and the feedback of the influence of the whole electric field of the valve tower on the waterway part can be simultaneously reflected in real time by applying the corresponding dielectric constant and resistivity to the waterway part of the valve tower subdivision model, calculating the corresponding capacitive electric field and resistive electric field according to the dielectric constant and the resistivity and extracting the actual operation alternating current-direct current composite voltage at the clamping point in the valve tower subdivision model; extracting actual running alternating current-direct current composite voltages at different clamping points and carrying out segmented loading, so that the accuracy of a loaded electric field is improved; and a transient electric field solver is adopted to carry out simulation calculation, so that the accuracy and the real-time performance of the simulation calculation are realized.
Drawings
Fig. 1 is a schematic flow chart of an electric field simulation method for a flexible dc converter valve tower according to an embodiment of the present invention.
Fig. 2 is a diagram illustrating an actual ac/dc composite voltage waveform at a clamping point of a valve tower according to an embodiment.
Fig. 3 is a schematic structural diagram of an electric field simulation apparatus of a flexible dc converter valve tower according to a third embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
Referring to fig. 1, a schematic flow chart of an electric field simulation method for a flexible dc converter valve tower according to an embodiment of the present invention is shown, including:
s101, determining a key part according to the structure of a valve tower of the flexible direct-current converter valve;
s102, establishing a flexible direct-current converter valve tower simulation model, and simplifying the flexible direct-current converter valve tower simulation model according to key parts to obtain a valve tower simplified model;
s103, dividing the valve tower simplified model to obtain a valve tower division model;
s104, determining corresponding dielectric constant and resistivity according to the material of the flexible direct current converter valve tower, and inputting the dielectric constant and the resistivity to a waterway part of the valve tower subdivision model;
s105, extracting actual running alternating current and direct current composite voltage at a clamping point in the valve tower subdivision model, and carrying out segmented loading;
s106, calculating electric field distribution in the valve tower subdivision model at different moments in a period by adopting a calculation method of the whole period transient field, and obtaining electric field strengths at different moments.
Preferably, the corresponding capacitive electric field and the resistive electric field can be calculated according to the dielectric constant and the resistivity, so that the dielectric constant and the resistivity can be changed according to the material of the flexible direct current converter valve tower, and the control of the capacitive electric field and the resistive electric field applied to the waterway part of the valve tower subdivision model is realized. Therefore, the influence of the water path part on the whole electric field of the valve tower is reflected in real time, and the feedback of the influence of the whole electric field of the valve tower on the electric field of the water path part is reflected.
In a specific embodiment, the corresponding dielectric constant and resistivity may be applied to other parts of the valve tower besides the channel part at the same time, so as to reflect the mutual influence between the other parts and the valve tower.
Further, the key sites include: one or more of a voltage-sharing shielding cover, a clamp point, a component connecting part, a tip part and a convex part in the flexible direct-current converter valve tower structure.
Further, according to key parts, simplifying a flexible direct current converter valve tower simulation model, specifically comprising: the valve tower simulation model reserves an external voltage-sharing shielding cover, a power module, a clamp point, a water path, an optical fiber pipeline, a supporting insulator at the lower end of the valve tower and an insulator for supporting the power module, and the lower end of the valve tower supports a voltage-sharing shielding ring at the middle connection part of the insulator;
simplifying a power module into a regular solid cuboid;
simplifying the insulator into a cylinder;
and carrying out filling or annular shielding ring on the closed hollow pipe.
The simulation model is simplified by determining the key parts in the valve tower, the influence of the umbrella skirt of the supporting insulator can be ignored, the influence of small parts on the whole potential distribution can be ignored, and the pertinence of simulation calculation is improved.
Further, subdividing the valve tower simplified model specifically comprises the following steps:
carrying out grid refinement on the key attention area, and subdividing by adopting a tetrahedral small-size grid;
roughly dividing the part with uniform electric field change and relatively small electric field intensity by adopting a large-size grid;
and (4) subdividing the components with regular shapes by adopting a sweeping method and adopting hexahedral meshes.
Preferably, the important attention area can be set to be the same as the key part, and also can be set to be a part in the flexible direct current converter valve tower with higher attention of simulation personnel, so that the complication of grid division is avoided.
Preferably, the part with uniform electric field change and relatively small electric field intensity is roughly divided by adopting a large-size grid, such as simplifying a power module in a cuboid.
In a specific embodiment, the mesh sizes of the small-size mesh and the large-size mesh may be adjusted according to actual simulation requirements, for example, the mesh minimum size of the small-size mesh is smaller than 1/2, or 1/3 of the mesh minimum size of the subdivided portion.
In particular embodiments, the dissection is performed preferentially over assemblies that can be dissected using a sweep method.
Further, referring to fig. 2, for a practical operation ac/dc composite voltage waveform corresponding to a certain clamping point of the valve tower in a specific embodiment, extracting a practical operation ac/dc composite voltage at the clamping point in the valve tower subdivision model, and performing segment loading, the method includes:
different clamping pointsThe actual running AC-DC composite voltage U (t) is expressed as a DC voltage component U dc Fundamental frequency ac voltage component u 1ac And a high frequency voltage component u hac As shown in formula (1):
u(t)＝U dc +u 1ac (t)+u hac (t) (1)
selecting a time-varying voltage waveform of one period in the actually-operated alternating current-direct current composite voltage waveform, and performing discretization processing; selecting discrete point voltage to be applied to corresponding clamping points, voltage-sharing shielding cases connected with the clamping points and power modules;
and carrying out electric field sectional loading on each clamping point by adopting a time domain discrete waveform.
Preferably, 10-30 discrete point voltages can be selected at different intervals in combination with waveform characteristics.
Corresponding capacitive electric fields and resistive electric fields are applied to the waterway part of the valve tower subdivision model, actual operation alternating current and direct current composite voltage at a clamping point in the valve tower subdivision model is extracted, and the alternating current and direct current composite voltage is actual real-time operation voltage, so that the influence of the waterway part on the whole electric field of the valve tower and the feedback of the influence of the whole electric field of the valve tower on the electric field of the waterway part can be simultaneously reflected in the actual operation alternating current and direct current composite voltage waveform in real time.
Preferably, since the operating voltages of different power modules and the uniform shielding cases are different and may be non-uniformly distributed in a specific implementation manner, the actual operating alternating current-direct current composite voltages at different clamping points are extracted and subjected to segmented loading, so that the accuracy of the loaded electric field is improved.
Further, the calculating method using the whole-period transient field calculates electric field distribution in the valve tower subdivision model at different times in a period to obtain electric field strengths at different times, and specifically includes:
a finite element calculation result matrix of the overall potential distribution in the valve tower of the flexible direct current converter station
Expressed as a direct current component
And an alternating current component
And, as shown in the following formula (3):
setting the alternating current component of the voltage waveform of the valve tower of the flexible direct current converter station as shown in the following formula (4):
u ac-i (t)＝U o k ac-i (t) (4)
in the formula of U o Is a standard voltage constant; k is a radical of ac-i (t) is the time varying scaling factor of the ac component of the corresponding voltage waveform;
according to the superposition principle, the grid unit calculation result matrix of the integral potential capacitive distribution at the time t
Represented by the following formula (5):
in a running period of the converter station direct current field, a grid unit calculation result matrix of the overall steady-state potential distribution at the time t can be obtained from the formula (3)
As shown in the following formula (6):
for the matrix
And carrying out scaling and matrix addition and subtraction operation on the obtained result according to the proportional coefficient of the loaded voltage waveform to obtain the electric field distribution in the valve tower subdivision model at different moments in a period.
Preferably, U o And can be set to any positive value, such as 100kV.
Preferably, for the formula (4), an approximate solution of the potential of any node in the field space at a certain moment is obtained according to the grid unit of the valve tower subdivision model; when the grid division of the solving model is fixed, the rigidity matrix is linear when the finite element method is used for solving, when the loading voltage changes, the potential distribution calculation result changes in an equal proportion, the calculation results of different voltage amplitudes can be obtained by setting the time-varying proportionality coefficient of the alternating-current component of the loaded voltage waveform, and the solving calculation amount is reduced.
By applying the method for calculating the full-field, multi-waveform composite and periodic time-varying electric field, the structural characteristics in the direct-current field and the distribution characteristics of the medium electric field under the alternating-current and direct-current composite voltage can be comprehensively reflected, the calculation results of the electric potential and the electric field distribution at any moment in a period can be obtained, and meanwhile, the number of times of solving the finite element equation can be effectively reduced, so that the calculation and analysis efficiency is improved.
The electric field simulation method for the valve tower of the flexible direct current converter valve provided by the embodiment of the invention comprises the following steps:
s201, determining a key part according to the structure of a valve tower of the flexible direct-current converter valve;
s202, establishing a flexible direct-current converter valve tower simulation model, and simplifying the flexible direct-current converter valve tower simulation model according to key parts to obtain a valve tower simplified model;
s203, dividing the valve tower simplified model to obtain a valve tower division model;
s204, determining corresponding dielectric constant and resistivity according to the material of the flexible direct current converter valve tower, and inputting the dielectric constant and the resistivity to a waterway part of the valve tower subdivision model;
s205, extracting the actual running alternating current-direct current composite voltage at the clamping point in the valve tower subdivision model, and carrying out segmented loading;
s206, calculating the electric field distribution in the valve tower subdivision model at different moments in a period by adopting a calculation method of the whole period transient field, and obtaining the electric field intensity at different moments.
Preferably, the corresponding capacitive electric field and the corresponding resistive electric field can be calculated according to the dielectric constant and the resistivity, so that the dielectric constant and the resistivity can be changed according to the material of the flexible direct current converter valve tower, and the control of the capacitive electric field and the resistive electric field applied to the waterway part of the valve tower subdivision model is realized. Therefore, the influence of the water path part on the whole electric field of the valve tower is reflected in real time, and the feedback of the influence of the whole electric field of the valve tower on the electric field of the water path part is reflected.
In a specific embodiment, the corresponding dielectric constant and resistivity may be applied to other parts of the valve tower except for the circuit part at the same time, so as to reflect the mutual influence between other parts and the valve tower.
Further, the key sites include: one or more of a voltage-sharing shielding cover, a clamp point, a component connecting part, a tip part and a convex part in the flexible direct-current converter valve tower structure.
Further, according to key parts, simplifying a flexible direct current converter valve tower simulation model, specifically comprising: the valve tower simulation model reserves an external voltage-sharing shielding cover, a power module, a clamp point, a water path, an optical fiber pipeline, a supporting insulator at the lower end of the valve tower and an insulator for supporting the power module, and the lower end of the valve tower supports a voltage-sharing shielding ring at the middle connection part of the insulator;
simplifying the power module into a regular solid cuboid;
simplifying the insulator into a cylinder;
and filling or annular shielding rings are carried out on the closed hollow pipe.
Further, subdividing the valve tower simplified model specifically comprises the following steps:
carrying out grid refinement on the key attention area, and subdividing by adopting a tetrahedral small-size grid;
roughly dividing the part with uniform electric field change and relatively small electric field intensity by adopting a large-size grid;
and (4) subdividing the components with regular shapes by adopting a sweeping method and adopting hexahedral meshes.
Further, extracting the actual running alternating current-direct current composite voltage at the clamping point in the valve tower subdivision model, and carrying out segmented loading, wherein the method comprises the following steps: applying voltage waveforms shown in the following formula (2) to corresponding clamping points, voltage-sharing shielding cover parts connected with the clamping points and power module parts;
in the formula of U 1m And theta 1 Amplitude and phase angle, U, of the fundamental voltage component, respectively im And theta i Respectively the amplitude and the phase angle of the ith harmonic voltage component, and n is the total harmonic frequency; u shape dc The direct current voltage component of the actual running alternating current-direct current composite voltage u (t) at different clamping points is obtained; omega is angular frequency; u (t) is the actual running alternating current-direct current composite voltage at the different clamping points;
and carrying out electric field sectional loading on each clamping point by adopting frequency domain waveforms.
Preferably, n is 3 to 5 when the high frequency component is small relative to the direct current and fundamental frequency components.
Further, the calculating method using the whole-period transient field calculates the electric field distribution in the valve tower subdivision model at different times in a period to obtain the electric field strengths at different times, and specifically includes:
a finite element calculation result matrix of the overall potential distribution in the valve tower of the flexible direct current converter station
Expressed as a direct current component
And an alternating current component
And, as shown in the following formula (3)：
Setting the alternating-current component of the voltage waveform of the valve tower of the flexible direct-current converter station as shown in the following formula (4):
u ac-i (t)＝U o k ac-i (t) (4)
in the formula of U o Is a standard voltage constant; k is a radical of formula ac-i (t) is the time varying scaling factor of the ac component of the corresponding voltage waveform;
according to the superposition principle, the grid unit calculation result matrix of the integral potential capacitive distribution at the time t
Represented by the following formula (5):
in the formula (I), the compound is shown in the specification,
represents the U o When the voltage is a standard voltage constant, the ith harmonic alternating current component is distributed in the flexible direct current converter station valve tower in an integral potential capacitive manner;
in a running period of the converter station direct current field, a grid unit calculation result matrix of the overall steady-state potential distribution at the time t can be obtained from the formula (3)
As shown in the following formula (6):
for the matrix
And carrying out scaling and matrix addition and subtraction operation on the obtained result according to the proportional coefficient of the loaded voltage waveform to obtain the electric field distribution in the valve tower subdivision model at different moments in a period.
Preferably, U o Any positive value, such as 100kV, may be set.
Preferably, for the formula (4), an approximate solution of the potential of any node in the field space at a certain moment is obtained according to the grid unit of the valve tower subdivision model; the grid division of the solving model is fixed, the rigidity matrix in the finite element method solving process is linear, when the loading voltage changes, the potential distribution calculation result changes in equal proportion, the calculation results in different voltage amplitudes can be obtained by setting the time-varying proportionality coefficient of the loaded voltage waveform alternating current component, and the solving calculation amount is reduced.
In a specific implementation manner, the electric field distribution in the valve tower subdivision model at different moments in a period is calculated, and after the electric field strengths at different moments are obtained, the electric field rule of the flexible direct current converter valve tower can be further obtained through the electric field strengths at different moments.
Referring to fig. 3, a schematic structural diagram of an electric field simulation apparatus of a flexible dc converter valve tower according to a third embodiment of the present invention is shown, including:
the key part determining unit 301 is used for determining a key part according to the structure of the flexible direct current converter valve tower;
the model simplifying unit 302 is used for establishing a flexible direct current converter valve tower simulation model and simplifying the flexible direct current converter valve tower simulation model according to key parts to obtain a valve tower simplified model;
the model dividing unit 303 is used for dividing the valve tower simplified model to obtain a valve tower dividing model;
the variable applying unit 304 is used for determining corresponding dielectric constant and resistivity according to the material of the flexible direct current converter valve tower, and inputting the dielectric constant and the resistivity to a waterway part of the valve tower subdivision model;
the segmented loading unit 305 is used for extracting the actual running alternating current-direct current composite voltage at the clamping point in the valve tower subdivision model and carrying out segmented loading;
and the electric field calculating unit 306 is configured to calculate electric field distributions in the valve tower subdivision models at different times in a period by using a calculation method of a full-period transient field, so as to obtain electric field strengths at different times.
The electric field simulation method, the electric field simulation device and the storage medium for the valve tower of the flexible direct-current converter valve provided by the embodiment of the invention have the following beneficial effects:
the simulation model is simplified by determining the key part in the valve tower, so that the influence of the umbrella skirt of the supporting insulator can be ignored, the influence of small parts on the whole potential distribution can be ignored, and the pertinence of simulation calculation is improved; the method has the advantages that the key attention area is subjected to grid refinement, and other parts are subjected to rough subdivision, so that the grid division is avoided being complicated; the influence of the waterway part on the whole electric field of the valve tower and the feedback of the influence of the whole electric field of the valve tower on the waterway part can be simultaneously reflected in real time by applying the corresponding dielectric constant and resistivity to the waterway part of the valve tower subdivision model, calculating the corresponding capacitive electric field and resistive electric field according to the dielectric constant and the resistivity and extracting the actual operation alternating current-direct current composite voltage at the clamping point in the valve tower subdivision model; the actual running alternating current and direct current composite voltages at different clamping points are extracted and segmented loading is carried out, so that the accuracy of a loaded electric field is improved; and (3) performing simulation calculation by adopting a transient electric field solver, and realizing the accuracy and the real-time performance of the simulation calculation.
Correspondingly, the fourth embodiment of the invention provides an electric field simulation device for a flexible direct current converter valve tower, which includes a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the electric field simulation method for the flexible direct current converter valve tower according to the first embodiment of the invention is implemented. The electric field simulation device of the flexible direct current converter valve tower can be a desktop computer, a notebook computer, a palm computer, a cloud server and other computing equipment. The electric field simulation device of the flexible direct current converter valve tower can comprise, but is not limited to, a processor and a memory.
Correspondingly, the fifth embodiment of the present invention provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, and when the computer program runs, a device where the computer-readable storage medium is located is controlled to execute the method for simulating an electric field of a flexible direct current converter valve tower according to the first embodiment of the present invention.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, or the like. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, the processor is a control center of the electric field simulation apparatus of the flexible dc converter valve tower, and various interfaces and lines are used to connect various parts of the electric field simulation apparatus of the whole flexible dc converter valve tower.
The memory can be used for storing the computer program and/or the module, and the processor can realize various functions of the electric field simulation device of the flexible direct current converter valve tower by running or executing the computer program and/or the module stored in the memory and calling the 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 required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
Wherein, the module/unit integrated by the electric field simulation device of the flexible direct current converter valve tower can be stored in a computer readable storage medium if the module/unit is realized in the form of a software functional unit and sold or used as an independent product. 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 described above 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, U.S. disk, removable hard disk, magnetic diskette, optical disk, computer Memory, read-Only Memory (ROM), random Access Memory (RAM), electrical carrier wave signal, telecommunications signal, and software distribution medium, etc.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (9)
1. An electric field simulation method of a flexible direct current converter valve tower is characterized by comprising the following steps:
determining a key part according to the structure of a valve tower of the flexible direct-current converter valve;
establishing a flexible direct-current converter valve tower simulation model, and simplifying the flexible direct-current converter valve tower simulation model according to the key part to obtain a valve tower simplified model;
subdividing the valve tower simplified model to obtain a valve tower subdivision model;
determining corresponding dielectric constant and resistivity according to the material of the flexible direct current converter valve tower, and inputting the dielectric constant and the resistivity to a waterway part of the valve tower subdivision model;
extracting actual running alternating current-direct current composite voltage at a clamping point in the valve tower subdivision model, and carrying out sectional loading;
calculating electric field distribution in the valve tower subdivision model at different moments in a period by adopting a calculation method of a whole-period transient field to obtain electric field strengths at different moments, and specifically comprising the following steps:
a finite element calculation result matrix of the overall potential distribution in the valve tower of the flexible direct current converter station
To represent
Is a direct current component
And an alternating current component
And, as shown in the following formula (3):
setting the alternating-current component of the voltage waveform of the valve tower of the flexible direct-current converter station as shown in the following formula (4):
u ac-i (t)＝U o k ac-i (t) (4)
in the formula of U o Is a standard voltage constant; k is a radical of formula ac-i (t) is the time varying proportionality coefficient of the alternating current component of the corresponding voltage waveform;
according to the superposition principle, the grid unit calculation result matrix of the integral potential capacitive distribution at the time t
Represented by the following formula (5):
in the formula (I), the compound is shown in the specification,
represents the U o When the voltage is a standard voltage constant, the ith harmonic alternating current component is distributed in the flexible direct current converter station valve tower in an integral potential capacitive manner;
in a running period of the converter station direct current field, a grid unit calculation result matrix of the overall steady-state potential distribution at the time t can be obtained from the formula (3)
As shown in the following formula (6):
for the matrix
The obtained result is subjected to scaling and matrix addition and subtraction operation according to the scale factor of the loaded voltage waveform to obtainElectric field distribution in the valve tower subdivision model at different times within a period.
2. The electric field simulation method for the flexible direct current converter valve tower according to claim 1, wherein the key parts comprise: one or more of a voltage-sharing shielding cover, a clamp point, a group component connecting part, a tip part and a protruding part in the flexible direct current converter valve tower structure are combined.
3. The electric field simulation method of the flexible direct current converter valve tower according to claim 2, wherein the simplifying the flexible direct current converter valve tower simulation model according to the key parts specifically comprises:
the valve tower simulation model reserves an external voltage-sharing shielding cover, a power module, a clamp point, a water path, an optical fiber pipeline, a supporting insulator at the lower end of the valve tower and an insulator for supporting the power module, and the lower end of the valve tower supports a voltage-sharing shielding ring at the middle connection part of the insulator;
simplifying the power module into a regular solid cuboid;
simplifying the insulator into a cylinder;
and filling or annular shielding rings are carried out on the closed hollow pipe.
4. The electric field simulation method for the valve tower of the flexible direct current converter valve according to claim 3, wherein the step of subdividing the simplified valve tower model specifically comprises:
carrying out grid refinement on the key attention area, and subdividing by adopting a tetrahedral small-size grid;
roughly dividing the part with uniform electric field change and relatively small electric field intensity by adopting a large-size grid;
and (4) subdividing the components with regular shapes by adopting a sweeping method and adopting hexahedral meshes.
5. The electric field simulation method for the valve tower of the flexible direct current converter valve according to claim 4, wherein the step of extracting the actual running alternating current-direct current composite voltage at the clamping point in the valve tower subdivision model for segment loading comprises the steps of:
representing the actual running AC-DC composite voltage U (t) at different clamping points as a DC voltage component U dc Fundamental frequency ac voltage component u 1ac And a high frequency voltage component u hac As shown in the following formula (1):
u(t)＝U dc +u 1ac (t)+u hac (t) (1)
selecting a time-varying voltage waveform of one period in the actually-operated alternating current-direct current composite voltage waveform, and performing discretization processing; selecting discrete point voltage to be applied to a corresponding clamping point, a voltage-sharing shielding cover connected with the clamping point and a power module;
and carrying out electric field segmented loading on each clamping point by adopting a time domain discrete waveform.
6. The electric field simulation method for the valve tower of the flexible direct current converter valve according to claim 4, wherein the step of extracting the actual running alternating current-direct current composite voltage at the clamping point in the valve tower subdivision model for segment loading comprises the steps of:
applying voltage waveforms shown in the following formula (2) to the corresponding clamping points, voltage-sharing shielding cover parts connected with the clamping points and power module parts;
in the formula of U 1m And theta 1 Amplitude and phase angle, U, of the fundamental voltage component, respectively im And theta i The amplitude and the phase angle of the ith harmonic voltage component are respectively, and n is the total harmonic frequency; u shape dc The direct current voltage component of the actual running alternating current-direct current composite voltage u (t) at different clamping points is used as the direct current component; omega is angular frequency; u (t) is the actual running alternating current-direct current composite voltage at the different clamping points;
and carrying out electric field segmented loading on each clamp point by adopting frequency domain waveforms.
7. An electric field simulation device of a flexible direct current converter valve tower is characterized by comprising:
the key part determining unit is used for determining a key part according to the structure of the flexible direct current converter valve tower;
the model simplifying unit is used for establishing a flexible direct current converter valve tower simulation model and simplifying the flexible direct current converter valve tower simulation model according to the key parts to obtain a valve tower simplified model;
the model subdivision unit is used for subdividing the valve tower simplified model to obtain a valve tower subdivision model;
the variable applying unit is used for determining corresponding dielectric constant and resistivity according to the material of the flexible direct current converter valve tower and inputting the dielectric constant and the resistivity to a waterway part of the valve tower subdivision model;
the segmented loading unit is used for extracting the actual running alternating current-direct current composite voltage at a clamping point in the valve tower subdivision model and carrying out segmented loading;
the electric field calculation unit is used for calculating the electric field distribution in the valve tower subdivision model at different moments in a period by adopting a calculation method of a whole period transient field, and obtaining the electric field intensity at different moments, and specifically comprises the following steps:
a finite element calculation result matrix of the overall potential distribution in the valve tower of the flexible direct current converter station
Expressed as a direct current component
And an alternating current component
And (3) below:
setting the alternating current component of the voltage waveform of the valve tower of the flexible direct current converter station as shown in the following formula (4):
u ac-i (t)＝U o k ac-i (t) (4)
in the formula of U o Is a standard voltage constant; k is a radical of ac-i (t) is the time varying proportionality coefficient of the alternating current component of the corresponding voltage waveform;
according to the superposition principle, the grid unit calculation result matrix of the integral potential capacitive distribution at the time t
Represented by the following formula (5):
in the formula (I), the compound is shown in the specification,
represents the U o When the voltage is a standard voltage constant, the ith harmonic alternating current component is distributed in the flexible direct current converter station valve tower in an integral potential capacitive manner;
in a running period of the converter station direct current field, a grid unit calculation result matrix of the overall steady-state potential distribution at the time t can be obtained from the formula (3)
As shown in the following formula (6):
for the matrix
Root of fruityAnd carrying out scaling and matrix addition and subtraction operation according to the scale factor of the loaded voltage waveform to obtain the electric field distribution in the valve tower subdivision model at different moments in a period.
8. An electric field simulation device of a flexible direct current converter valve tower, comprising a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, wherein the processor, when executing the computer program, implements an electric field simulation method of a flexible direct current converter valve tower according to any one of claims 1 to 6.
9. A computer-readable storage medium, comprising a stored computer program, wherein when the computer program is executed, the computer-readable storage medium is controlled to implement an electric field simulation method for a flexible dc converter valve tower according to any one of claims 1 to 6.
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