CN111177959A - Optimization design method of smoothing reactor - Google Patents
Optimization design method of smoothing reactor Download PDFInfo
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Abstract
The invention relates to the field of extra-high voltage and extra-high voltage direct current, and discloses an optimal design method of a smoothing reactor, which comprises the following steps: step S1: analyzing and calculating the target direct current transmission system under different working conditions to obtain the electrode voltage of the smoothing reactor under different working conditions; step S2: carrying out analytic design on the structure, the size and the spatial position of the smoothing reactor according to the electrode voltage of the smoothing reactor under different working conditions; step S3: and 3D modeling is carried out on the smoothing reactor according to the analysis design result, and finite element analysis improvement is carried out on the smoothing reactor with the 3D structure to obtain the smoothing reactor with the optimal 3D structure. The invention solves the problem that the corona problem on the surface of the smoothing reactor electrode is increased along with the increase of the voltage, and further solves the problems of electromagnetic interference and insulation, thereby improving the reliability of the extra-high voltage power grid.
Description
Technical Field
The invention relates to the field of ultra-high and extra-high voltage direct current, in particular to an optimal design method for electrode corona discharge of a smoothing reactor of an ultra-high and extra-high voltage direct current transmission system.
Background
In recent years, with the rapid development of national economy, the power grid in China is greatly developed in the process of continuously meeting the economic development requirement, the voltage grade of the power grid is continuously improved, and the capacity is continuously enlarged. The distribution pattern of energy resources and energy consumption in China determines the basic energy flow directions of 'west-east power transmission' and 'north-south coal transportation', the power supply and the coal transportation are increasingly tense, the power transmission pressure of a power grid is higher and higher, a direct current power transmission mode with a higher voltage level is adopted, long-distance and large-scale west-east power transmission can be realized, and the distribution pattern has important significance for building a resource-saving and environment-friendly power grid and accelerating the optimal allocation of energy resources.
In the construction of ultra-high and extra-high voltage direct current projects, the smoothing reactor occupies a particularly important position in the aspects of investment and design and construction difficulty, and the design of the smoothing reactor is more directly related to the safe and stable operation and the project investment of the direct current project. The application of the ultra-high voltage technology and the extra-high voltage technology brings new problems to the design of the smoothing reactor. Along with the increase of voltage, the corona problem on the surface of the smoothing reactor electrode is increased, and the reliability of an extra-high voltage power grid is seriously influenced by the electromagnetic interference and insulation problems caused by the corona problem.
Therefore, it is urgently needed to develop an optimal design method of the smoothing reactor, which overcomes the above defects.
Disclosure of Invention
In view of the above problems, the present invention provides an optimized design method for a smoothing reactor, wherein the method comprises:
step S1: analyzing and calculating the target direct current transmission system under different working conditions to obtain the electrode voltage of the smoothing reactor under different working conditions;
step S2: carrying out analytic design on the structure, the size and the spatial position of the smoothing reactor according to the electrode voltage of the smoothing reactor under different working conditions;
step S3: and 3D modeling is carried out on the smoothing reactor according to the analysis design result, and finite element analysis improvement is carried out on the smoothing reactor with the 3D structure to obtain the smoothing reactor with the optimal 3D structure.
The above optimization design method further includes:
step S4: and verifying the smoothing reactor with the optimal 3D structure.
The above-mentioned optimization design method, wherein the step S1 includes:
step S11: establishing an electromagnetic transient model of a target direct-current power transmission system;
step S12: and analyzing, calculating and simulating the electrode voltage waveforms of the smoothing reactor running under different working conditions and under the electromagnetic transient state according to the electromagnetic transient model to obtain the electrode voltages of the smoothing reactor under different working conditions.
The above-mentioned optimization design method, wherein the step S2 includes:
step S21: determining the maximum voltage value of the electrode pair grounding point of the smoothing reactor according to the electrode voltage of the smoothing reactor under different working conditions;
step S22: obtaining the insulation distance between the electrodes of the smoothing reactor according to the maximum voltage value;
step S23: analyzing and calculating the size of the smoothing reactor and the spatial position distribution of the electrode according to the maximum voltage value and the insulation distance, and determining the surface corona-starting electric field intensity;
step S24: and carrying out analytic design on the smoothing reactor according to the surface corona-forming electric field intensity, and determining the structure and the size of the smoothing reactor and the spatial distribution of each part.
The above-mentioned optimization design method, wherein the step S3 includes:
step S31: 3D modeling is carried out on the smoothing reactor according to the structure and the size of the smoothing reactor and the spatial distribution of each part;
step S32: and (4) judging the surface electric field intensity of the local position of the smoothing reactor with the 3D structure through finite element analysis to obtain the optimal smoothing reactor with the 3D structure.
The above-mentioned optimization design method, wherein the step S32 includes:
returning to step S23 when the surface electric field strength is less than the surface blooming electric field strength and exceeds a threshold;
and when the surface electric field intensity is greater than the surface corona starting electric field intensity and does not exceed the threshold value, obtaining the optimal smoothing reactor with the 3D structure.
In the above optimized design method, in step S4, an experimental platform is built to perform design verification on the smoothing reactor with the optimal 3D structure, and when the verification result is inconsistent with the design result, the step S24 is returned.
The optimization design method comprises the step of correcting and confirming different altitudes, filth and surface roughness.
In the above optimized design method, in step S24, the smoothing reactor is analytically designed according to the surface corona-initiating electric field strength based on the Peek formula.
The above-mentioned optimization design method, wherein the step S32 includes:
when the local electric field reaches the blooming condition, returning to step S23;
and when the local electric field does not reach the corona starting condition, obtaining the smoothing reactor with the optimal 3D structure.
The invention aims at the effect of the prior art and aims at solving the problem that the corona problem on the surface of the electrode of the smoothing reactor is increased along with the rise of voltage through the optimized design method of the smoothing reactor, thereby solving the problems of electromagnetic interference and insulation and further improving the reliability of an extra-high voltage power grid.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a flow chart of an optimal design method of the present invention;
FIG. 2 is a flowchart illustrating the substeps of step S1 in FIG. 1;
FIG. 3 is a flowchart illustrating the substeps of step S2 in FIG. 1;
FIG. 4 is a flowchart illustrating the substeps of step S3 in FIG. 1;
FIG. 5 is a flowchart illustrating an application of the optimal design method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The exemplary embodiments of the present invention and the description thereof are provided to explain the present invention and not to limit the present invention. Additionally, the same or similar numbered elements/components used in the drawings and the embodiments are used to represent the same or similar parts.
As used herein, the terms "first," "second," …, etc., do not denote any order or sequence, nor are they used to limit the present invention, but rather are used to distinguish one element from another or from another element or operation described in the same technical language.
With respect to directional terminology used herein, for example: up, down, left, right, front or rear, etc., are simply directions with reference to the drawings. Accordingly, the directional terminology used is intended to be illustrative and is not intended to be limiting of the present teachings.
As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.
As used herein, "and/or" includes any and all combinations of the described items.
References to "plurality" herein include "two" and "more than two"; reference to "multiple sets" herein includes "two sets" and "more than two sets".
As used herein, the terms "substantially", "about" and the like are used to modify any slight variation in quantity or error that does not alter the nature of the variation. Generally, the range of slight variations or errors modified by such terms may be 20% in some embodiments, 10% in some embodiments, 5% in some embodiments, or other values. It should be understood by those skilled in the art that the aforementioned values can be adjusted according to actual needs, and are not limited thereto.
Referring to fig. 1, fig. 1 is a flowchart of an optimal design method according to the present invention. As shown in fig. 1, the optimal design method of the present invention includes the following steps:
step S1: and analyzing and calculating the target direct current transmission system under different working conditions to obtain the electrode voltage of the smoothing reactor under different working conditions.
In step S1, the method includes:
step S11: establishing an electromagnetic transient model of a target direct-current power transmission system;
step S12: analyzing, calculating and simulating the electrode voltage waveforms of the smoothing reactor running under different working conditions and under the electromagnetic transient state according to the electromagnetic transient model to obtain the electrode voltages of the smoothing reactor under different working conditions; calculating, analyzing and simulating the voltage of the smoothing reactor electrode to the ground under various working conditions through an electromagnetic transient model, which is the basis for selecting the smoothing reactor electrode corona onset voltage so as to determine the surface corona field intensity, in the embodiment, different working conditions include: steady state, dynamic, and transient conditions, but the invention is not limited thereto.
Specifically, the smoothing reactor is used as an important element in a direct current transmission system, the electrode voltage of the smoothing reactor is influenced by the topology, parameters and operation conditions of the whole system, the electrode voltage of the smoothing reactor under the stable state, dynamic state and transient state operation conditions of the system is analyzed and calculated, and the electrode voltage of the smoothing reactor under the states can be directly obtained. More importantly, by means of electromagnetic transient calculation and simulation software, the voltage waveforms of the electrodes of the smoothing reactor running under different working conditions and under the electromagnetic transient can be analyzed, calculated and simulated in detail, so that the voltages of the electrodes of the smoothing reactor under different working conditions are determined, and a foundation is laid for selection of the corona onset voltage and the surface corona onset field intensity.
Step S2: carrying out analytic design on the structure, the size and the spatial position of the smoothing reactor according to the electrode voltage of the smoothing reactor under different working conditions; in the embodiment, the starting corona voltage and the surface starting field intensity, and the threshold range allowing parameter variation are determined, and the structure, the size and the spatial position of the smoothing reactor are analytically designed according to a Peek formula and an optimization algorithm.
In step S2, the method includes:
step S21: determining the maximum voltage value of the electrode pair grounding point of the smoothing reactor according to the electrode voltage of the smoothing reactor under different working conditions; on the basis of analyzing and calculating the electrode voltage of the smoothing reactor under different working conditions of the direct current system, the maximum voltage value of the electrode of the smoothing reactor to the grounding point is preliminarily determined.
Step S22: obtaining the insulation distance between the electrodes of the smoothing reactor according to the maximum voltage value; in the present embodiment, the insulation distance between the two poles of the smoothing reactor is according to the Peek formula.
Step S23: analyzing and calculating the size of the smoothing reactor and the spatial position distribution of the electrode according to the maximum voltage value and the insulation distance, and determining the surface corona-starting electric field intensity; in the embodiment, the size of the smoothing reactor with the special structure and the electrode space position distribution are preliminarily analyzed and calculated according to the Peek formula, and the surface corona electric field intensity under the size is determined on the basis of design experience.
Step S24: carrying out analytic design on the smoothing reactor according to the surface corona-initiating electric field intensity, and determining the structure and the size of the smoothing reactor and the spatial distribution of each part; and designing an analytical method for the smoothing reactor by taking a Peek formula as a basis, determining the basic structure, the insulation distance, the size of the electrode and the spatial distribution of each part, and utilizing an optimization algorithm in the design process of the analytical method.
Step S3: 3D modeling is carried out on the smoothing reactor according to the analytic design result, and finite element analysis improvement is carried out on the smoothing reactor with the 3D structure to obtain the smoothing reactor with the optimal 3D structure; on the basis of a calculation result of a Peek formula, a 3D structure of the smoothing reactor is designed, a numerical calculation method and an optimization algorithm are combined, complementary design and simulation are carried out on an analytic design, analysis and design improvement are carried out on a local electric field and a halo condition, and then iterative design is carried out. In the embodiment, the analysis design is subjected to supplementary design and simulation by combining finite element analysis and optimization algorithm, but the invention is not limited thereto.
In step S3, the method includes:
step S31: 3D modeling is carried out on the smoothing reactor according to the structure and the size of the smoothing reactor and the spatial distribution of each part;
step S32: the surface electric field intensity of the local position of the smoothing reactor with the 3D structure is judged through finite element analysis to obtain the optimal smoothing reactor with the 3D structure; in step S32, when the surface electric field strength is less than the surface blooming electric field strength and exceeds the threshold, return to step S23; and when the surface electric field intensity is greater than the surface corona starting electric field intensity and does not exceed a threshold value, obtaining the optimal smoothing reactor with the 3D structure.
Specifically, the smoothing reactor is subjected to detailed 3D design and modeling on the basis of analytical method design (combined with an optimization algorithm). Because the analytic formula can not represent a special structure, the electric fields between different parts are mutually coupled, and the calculation of the surface corona field intensity of the parts with different sizes is inaccurate, finite element analysis, simulation and design are continuously carried out on the smoothing reactor with the 3D structure, and the design can also be carried out through an optimization algorithm. Because the surface electric field is an extremely uneven field, under the electrode voltage corresponding to certain operating conditions, the surface electric field strength at a local position may be smaller than a designed value of the corona onset electric field strength and exceed an allowable threshold value, in this case, the determining of the corona onset voltage and the corona onset surface field strength is returned again, the overall size and the analytic design of the smoothing reactor are re-determined, and then the numerical analysis (finite element) design on details is carried out, which is an iterative process until the electrode surface corona onset field strength is larger than the minimum corona onset field strength value determined before, and the design of the step is finished.
In another embodiment of the present invention, in step S32, when the local electric field reaches the halo condition, the process returns to step S23; and when the local electric field does not reach the corona starting condition, obtaining the smoothing reactor with the optimal 3D structure.
Further, the optimization design method of the invention further comprises:
step S4: and verifying the smoothing reactor with the optimal 3D structure. On the basis of finishing the design, an experimental platform is set up for verification, and because the factors of environment and external influence can not be considered comprehensively through the analytic design and the numerical calculation design, the design verification is carried out through the test result, and if the test result deviates from the design, the correction of the analytic design formula and the correction of the finite element numerical calculation design are carried out. This is a process of iterative design until the trial of the design results meets the requirements.
Specifically, design verification is carried out on the smoothing reactor with the optimal 3D structure by building an experimental platform, and when a verification result is inconsistent with a design result, the step S24 is returned; the method comprises the steps of setting up a test platform, verifying design, correcting and confirming different altitudes, dirt and rough surface conditions, correcting a Peek formula if a test result has deviation, returning to the step of determining the corona onset voltage and the corona onset field strength again if the corona onset voltage and the corona onset field strength are lower than a design value and do not exceed a design threshold value, and carrying out iterative design; and finally, when the test result meets the design requirement and is matched with the parameters of the design process, finishing the design step.
Referring to fig. 5, fig. 5 is a flowchart illustrating an application of the optimal design method according to the present invention. Referring to fig. 5, the optimization design method of the present invention is described in detail below with a specific embodiment.
In conclusion, the optimal design method of the smoothing reactor can solve the problem that the corona problem on the surface of the electrode of the smoothing reactor is increased along with the increase of the voltage, further solve the problems of electromagnetic interference and insulation, and further improve the reliability of the extra-high voltage power grid.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. An optimal design method of a smoothing reactor is characterized by comprising the following steps:
step S1: analyzing and calculating the target direct current transmission system under different working conditions to obtain the electrode voltage of the smoothing reactor under different working conditions;
step S2: carrying out analytic design on the structure, the size and the spatial position of the smoothing reactor according to the electrode voltage of the smoothing reactor under different working conditions;
step S3: and 3D modeling is carried out on the smoothing reactor according to the analysis design result, and finite element analysis improvement is carried out on the smoothing reactor with the 3D structure to obtain the smoothing reactor with the optimal 3D structure.
2. The optimal design method of claim 1, further comprising:
step S4: and verifying the smoothing reactor with the optimal 3D structure.
3. The optimal design method according to claim 2, wherein the step S1 includes:
step S11: establishing an electromagnetic transient model of a target direct-current power transmission system;
step S12: and analyzing, calculating and simulating the electrode voltage waveforms of the smoothing reactor running under different working conditions and under the electromagnetic transient state according to the electromagnetic transient model to obtain the electrode voltages of the smoothing reactor under different working conditions.
4. The optimal design method according to claim 3, wherein the step S2 includes:
step S21: determining the maximum voltage value of the electrode pair grounding point of the smoothing reactor according to the electrode voltage of the smoothing reactor under different working conditions;
step S22: obtaining the insulation distance between the electrodes of the smoothing reactor according to the maximum voltage value;
step S23: analyzing and calculating the size of the smoothing reactor and the spatial position distribution of the electrode according to the maximum voltage value and the insulation distance, and determining the surface corona-starting electric field intensity;
step S24: and carrying out analytic design on the smoothing reactor according to the surface corona-forming electric field intensity, and determining the structure and the size of the smoothing reactor and the spatial distribution of each part.
5. The optimal design method according to claim 4, wherein the step S3 includes:
step S31: 3D modeling is carried out on the smoothing reactor according to the structure and the size of the smoothing reactor and the spatial distribution of each part;
step S32: and (4) judging the surface electric field intensity of the local position of the smoothing reactor with the 3D structure through finite element analysis to obtain the optimal smoothing reactor with the 3D structure.
6. The optimal design method according to claim 5, wherein the step S32 includes:
returning to step S23 when the surface electric field strength is less than the surface blooming electric field strength and exceeds a threshold;
and when the surface electric field intensity is greater than the surface corona starting electric field intensity and does not exceed the threshold value, obtaining the optimal smoothing reactor with the 3D structure.
7. The optimal design method according to any one of claims 3 to 6, wherein in the step S4, an experimental platform is constructed to perform design verification on the smoothing reactor with the optimal 3D structure, and when the verification result is inconsistent with the design result, the step S24 is returned.
8. The method of claim 7, wherein design verification includes correction and verification of different altitudes, fouling, surface roughness.
9. The optimal design method according to claim 4, wherein in step S24, the smoothing reactor is analytically designed according to the surface corona field strength based on a Peek formula.
10. The optimal design method according to claim 5, wherein the step S32 includes:
when the local electric field reaches the blooming condition, returning to step S23;
and when the local electric field does not reach the corona starting condition, obtaining the smoothing reactor with the optimal 3D structure.
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| CN112926240A (en) * | 2021-02-01 | 2021-06-08 | 中国人民解放军海军工程大学 | Design method for short-time working large-capacity water-cooling reactor |
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