CN113378428A - Electric field distribution estimation method for alternating current filter lightning arrester of extra-high voltage direct current converter station - Google Patents
Electric field distribution estimation method for alternating current filter lightning arrester of extra-high voltage direct current converter station Download PDFInfo
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- CN113378428A CN113378428A CN202110520219.4A CN202110520219A CN113378428A CN 113378428 A CN113378428 A CN 113378428A CN 202110520219 A CN202110520219 A CN 202110520219A CN 113378428 A CN113378428 A CN 113378428A
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- simulation
- arrester
- electric field
- lightning arrester
- field distribution
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2111/00—Details relating to CAD techniques
- G06F2111/10—Numerical modelling
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The invention discloses an electric field distribution estimation method of an alternating current filter arrester of an extra-high voltage direct current converter station, which comprises the steps of respectively establishing a three-dimensional mechanical model and an Ansys electronics Desktop by utilizing Solidworks according to the actual structure of the arrester, and adjusting simulation parameters to calculate the external insulation and the internal electric field distribution of the arrester.
Description
Technical Field
The invention relates to the field of voltage analysis, in particular to an electric field distribution estimation method for an alternating current filter arrester of an extra-high voltage direct current converter station.
Background
The reverse distribution of electricity load centers and energy resources in China makes the ultra-high voltage direct current transmission technology become an important technical means for solving the contradiction between electric energy production and use.
The alternating current filter can filter harmonic waves and provide reactive power, and is an important component in a high-voltage direct current transmission system. The lightning arrester for the alternating current filter can limit overvoltage of filter equipment under various operations and faults, and is important equipment for ensuring safe and stable operation of the filter. The operation report shows that the direct current reference voltage of the lightning arrester for the alternating current filter of part of the converter stations is reduced by more than 5%, and the phenomena of side flashover and cracking of valve plates in the lightning arrester are found after disassembly. The concentrated distribution of the electric field may be the cause of damage to the valve plate of the lightning arrester, so it is necessary to perform calculation of the distribution of the electric field of the lightning arrester for the ac filter to find out the cause of damage to the valve plate of the lightning arrester.
Finite element simulation based on electrostatic field is an effective means for accurately calculating electric field distribution. At present, finite element simulation analysis is carried out on the external insulation of the lightning arrester by research. However, there is still a lack of research on electric field distribution calculation considering both the external insulation and the internal structure of the arrester, and therefore, there is a need to provide an electric field distribution calculation method considering both the external insulation and the internal structure of the arrester.
Disclosure of Invention
In order to overcome the defects and shortcomings of the prior art, the invention provides an electric field distribution estimation method of an alternating current filter arrester of an extra-high voltage direct current converter station.
The invention adopts the following technical scheme:
an electric field distribution estimation method for an alternating current filter arrester of an extra-high voltage direct current converter station comprises the following steps:
obtaining the external insulation of the arrester and the electrical connection, the geometric structure, the spatial structure and the size of the interior of the arrester;
establishing a three-dimensional geometric structure model of the lightning arrester by utilizing Solidworks three-dimensional design software;
establishing an electrostatic field three-dimensional simulation model according to the lightning arrester three-dimensional geometric structure model;
acquiring equipment information of a user, wherein the equipment information comprises structural parameters such as material, size, structure, conductivity and relative dielectric constant of the arrester, setting attribute characteristics of the arrester in an electrostatic field three-dimensional simulation model, applying voltage to a high-voltage end of the arrester according to the electrical connection of the arrester, and grounding a low-voltage end;
and modifying the simulation parameters for simulation, recording the simulation result of each time until the simulation parameters in the three-dimensional finite element simulation reach the optimum, and stopping the simulation. The simulation result shows that in a certain range, the higher the iteration frequency is, the lower the iteration error is, and the larger the solution domain is, the finer the obtained simulation result is, but the slower the calculation speed is. When the iteration frequency reaches 20, the iteration error is 1 percent, and the solution domain reaches 300 percent, the iteration frequency or the solution domain is increased, and the distribution of the electric field of the arrester is basically unchanged, so that the calculation efficiency of the electric field of the arrester can be considered to be the highest.
Setting three-dimensional finite element simulation model attributes according to the optimal simulation parameters, applying voltage excitation externally, dividing grids, setting maximum iteration times, iteration errors and solving domains, estimating electric field distribution,
further, the simulation parameters are modified for simulation, each simulation result is recorded until the simulation parameters in the three-dimensional finite element simulation reach the optimum, and the simulation is stopped, specifically, a control variable method is adopted.
Further, the simulation parameters include mesh division, maximum iteration number, iteration error, and solution domain.
Further, the voltage applied to the high-voltage end of the arrester is the maximum overvoltage borne by the arrester, and the specific calculation process is as follows:
establishing an overvoltage simulation calculation model of the ultra-high voltage direct current transmission system, then calculating continuous operation voltage of the alternating current filter lightning arrester during normal operation and maximum voltage born under operation and fault working conditions such as filter input, filter bus grounding fault, alternating current bus grounding fault and the like, wherein one group of filters are selected to be input in the filter input working conditions, other filters are in an operation state, transient overvoltage of each group of filters lightning arrester when the input angle is 0-90 degrees is respectively calculated, the bus grounding fault calculates transient overvoltage of each group of filters lightning arrester under different fault occurrence time, and the maximum value is selected.
Further, the ratio of the three-dimensional geometric structure model to the lightning arrester is 1: 1.
Further, an Ansys electrostatic field simulation environment is selected in Ansys Electronic Desktop three-dimensional finite element simulation software, and an electrostatic field three-dimensional simulation model is established.
Further, the lightning arrester property characteristics include material, electrical conductivity and relative dielectric constant of the medium.
Furthermore, the control variable method is to gradually modify the simulation conditions from small to large under the condition that other conditions are not changed until the simulation result reaches the best.
The invention has the beneficial effects that:
at present, a research method for calculating the electric field distribution of the lightning arrester of the alternating current filter considering the external insulation and the internal structure of the lightning arrester at the same time is lacked. The method can calculate the distribution of the external insulation and the internal electric field of the arrester for the AC filter, and can provide reference for the subsequent fault research of the arrester of the AC filter.
Drawings
FIG. 1 is a flow chart of the operation of the present invention;
fig. 2 is a view of the structure of the arrester;
FIG. 3 is a topology of an internal valve plate of the arrester;
FIG. 4 is a three-dimensional model of the outer insulation of the arrester;
fig. 5 is a sectional view of an overall three-dimensional model of the arrester;
FIG. 6 is an extra-high voltage DC power transmission system overvoltage calculation topology;
fig. 7(a) -7 (e) are trend graphs of the variation of the lightning arrester electric field distribution with the solution domains, which are 0%, 100%, 200%, 300% and 400%, respectively.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.
Examples
As shown in fig. 1, a method for estimating electric field distribution of an arrester of an ac filter of an extra-high voltage dc converter station includes:
and S1, analyzing the electrical connection, the geometric structure, the spatial structure, the material and the size of the external insulation and the internal insulation of the lightning arrester according to the lightning arrester design drawing or actual measurement data. In the embodiment, an A-type DT11/24 AC filter F1 lightning arrester is taken as an example, and the drawing of the lightning arrester is shown in FIG. 2. The inside of the arrester is formed by connecting 3 columns of valve plates in parallel, 26 valve plates are arranged on each column, and 78 valve plates are arranged on each column, and the topology of the arrester is shown in figure 3.
S2, according to the geometric structure, the space structure and the size of the lightning arrester, a 1:1 three-dimensional geometric structure model of the lightning arrester is built by utilizing Solidworks three-dimensional design software, as shown in figures 4 and 5.
S3, importing the model established in S2 into Ansys Electronic Desktop three-dimensional finite element simulation software, selecting an Ansys electrostatic field simulation environment, and establishing an electrostatic field three-dimensional simulation model.
S4 sets the attributes of the arrester, such as material and relative dielectric constant, in the simulation model according to the drawing or the device information provided by the manufacturer, where the relative dielectric constants of the components of the arrester are shown in table 1. According to the electrical connection of the lightning arrester, voltage is applied to the high-voltage end of the lightning arrester, and the low-voltage end is grounded.
S5, establishing an overvoltage simulation calculation model of the extra-high voltage direct current transmission system, and calculating the continuous operation voltage of the alternating current filter arrester in normal operation and the maximum voltage born under each operation and fault condition, wherein the overvoltage simulation calculation model is shown in FIG. 6. And applying the maximum voltage to a high-voltage end of the lightning arrester in the three-dimensional simulation model, wherein the maximum overvoltage borne by the lightning arrester is 225.2kV under the single-phase grounding working condition of the bus of the alternating-current filter if the maximum overvoltage is obtained through simulation calculation, and the grounding end is set to be 0 kV.
S6, obtaining the optimal simulation parameters in the three-dimensional finite element simulation by a simulation iteration method, including mesh division fineness, maximum iteration times, iteration errors and solution domain solving. Therefore, a control variable method is adopted, under the condition that other conditions are not changed, simulation conditions are gradually modified for simulation, and the simulation result of each step is recorded until the simulation efficiency and the simulation result are optimal. Taking the solution domain as an example, the change of the lightning arrester electric field distribution with the solution domain under the same condition is shown in fig. 7(a) to 7 (e). And when the solution domain reaches 300%, the electric field distribution of the lightning arrester basically does not change along with the continuous increase of the solution domain. Considering the solution speed, this example sets the solution domain to 300%.
S7, according to the model attribute of S4 and the optimal simulation parameter recorded in S6, setting the simulation model attribute, externally applying voltage excitation, dividing grids, setting the maximum iteration times, the iteration error and the solution domain, and carrying out electric field distribution numerical calculation. The result of the calculation of the electric field distribution of the arrester in this example is shown in fig. 7 (d).
TABLE 1 relative dielectric constant of each component of lightning arrester
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (8)
1. An electric field distribution estimation method for an alternating current filter arrester of an extra-high voltage direct current converter station is characterized by comprising the following steps:
obtaining the external insulation of the arrester and the electrical connection, the geometric structure, the spatial structure and the size of the interior of the arrester;
establishing a three-dimensional geometric structure model of the lightning arrester by utilizing Solidworks three-dimensional design software;
establishing an electrostatic field three-dimensional simulation model according to the three-dimensional geometric structure model of the lightning arrester;
acquiring equipment information of a user, setting attribute characteristics of a lightning arrester in an electrostatic field three-dimensional simulation model, applying voltage to a high-voltage end of the lightning arrester according to the electrical connection of the lightning arrester, and grounding a low-voltage end;
modifying the simulation parameters for simulation, recording the simulation result of each time until the simulation parameters in the three-dimensional finite element simulation reach the optimum, and stopping the simulation;
and setting attribute characteristics of the three-dimensional finite element simulation model according to the optimal simulation parameters, externally applying voltage excitation, and estimating the electric field distribution.
2. The method of claim 1, wherein the modification of simulation parameters is performed for simulation, and each simulation result is recorded until the simulation parameters in the three-dimensional finite element simulation are optimized, and the simulation is stopped, specifically, a controlled variable method is used.
3. The electric field distribution estimation method according to claim 1, wherein the simulation parameters include a grid division, a maximum number of iterations, an iteration error, and a solution domain.
4. The electric field distribution estimation method according to any one of claims 1 to 3, wherein the voltage applied to the high-voltage end of the arrester is a maximum overvoltage borne by the arrester, and the specific calculation process is as follows:
and establishing an overvoltage simulation calculation model of the extra-high voltage direct current transmission system, and then calculating the continuous operation voltage of the alternating current filter lightning arrester in normal operation and the maximum voltage born under each operation and fault working condition.
5. The electric field distribution estimation method according to claim 1, wherein the ratio of the three-dimensional geometric structure model to the lightning arrester is 1: 1.
6. The electric field distribution estimation method according to claim 1, wherein an Ansys electrostatic field simulation environment is selected in Ansys Electronic Desktop three-dimensional finite element simulation software to build an electrostatic field three-dimensional simulation model.
7. The electric field distribution estimation method according to claim 1, wherein the lightning arrester property characteristics include a material, an electric conductivity, and a relative permittivity of a medium.
8. The method according to claim 2, wherein the control variable method is to modify the simulation conditions from small to large in a stepwise manner without changing other conditions until the simulation result is optimal.
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| CN202110520219.4A CN113378428A (en) | 2021-05-13 | 2021-05-13 | Electric field distribution estimation method for alternating current filter lightning arrester of extra-high voltage direct current converter station |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114062810A (en) * | 2021-11-11 | 2022-02-18 | 国网湖南省电力有限公司 | Fracture prediction method for zinc oxide line arrester |
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2021
- 2021-05-13 CN CN202110520219.4A patent/CN113378428A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114062810A (en) * | 2021-11-11 | 2022-02-18 | 国网湖南省电力有限公司 | Fracture prediction method for zinc oxide line arrester |
| CN114062810B (en) * | 2021-11-11 | 2023-07-25 | 国网湖南省电力有限公司 | Fracture prediction method for zinc oxide line lightning arrester |
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