CN109241647B - Method for acquiring equivalent model and parameters of power element based on field and circuit combination - Google Patents
Method for acquiring equivalent model and parameters of power element based on field and circuit combination Download PDFInfo
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- CN109241647B CN109241647B CN201811104833.7A CN201811104833A CN109241647B CN 109241647 B CN109241647 B CN 109241647B CN 201811104833 A CN201811104833 A CN 201811104833A CN 109241647 B CN109241647 B CN 109241647B
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Abstract
The invention discloses a method for acquiring an equivalent model and parameters of a power element based on field-circuit combination, which is characterized by comprising the following steps of: step1, acquiring structure and size parameters of the power element; step2, establishing a three-dimensional structure model of the power element in ANSYS three-dimensional simulation software; step3, applying a low-voltage traveling wave test to the three-dimensional structure model of the Step2 to obtain the unit Step response of the power element; step4, combining the connection structure of the power element and other elements to give a qualitative equivalent circuit model of the power element; at Step5, parameters of the qualitative circuit model of the power element are determined according to the principle that the qualitative circuit model obtained at Step4 matches the unit Step response of the power element. The invention effectively solves the problem that the simulation result is greatly different from the actual result caused by the fact that the prior power element model and empirical parameters are continuously used in the prior art.
Description
Technical Field
The invention relates to the field of modeling simulation of power systems, in particular to a method for acquiring equivalent models and parameters of power elements based on field-circuit combination.
Background
Due to the particularity of the power system network, such as the characteristics of high voltage level, long line, complex related parameters and the like, when numerical calculation is carried out, the research method is complex and large in calculation amount, and meanwhile, a specific test lacks a corresponding test environment. On the premise, the specific problems are modeled and simulated by using computer related software, and the method is easier in comparison, and has the advantages of convenience in operation, fitting with actual conditions and the like.
However, with the development of power systems, nowadays more and more researchers find that the result of modeling simulation and the result of actual experiment are far different from the error-allowable range, and the main reasons may be: (1) the modeling of a part of the power element is still continued by the former model, such as the model of the isolating switch; (2) modeling of parts of the power components is based on previous experience to select corresponding relevant parameters, such as parameters of the cable. It can be seen that, at present, the modeling simulation of the power system still continues to use the previous models and empirical parameters, but as the power system develops, these models and parameters may have some changes, which directly results in that the simulation result from experience is greatly different from the actual result.
The field-circuit combination method is an electromagnetic calculation method which is widely applied in the field of motor design in recent decades, is firstly applied to determining relevant parameters during motor design, and has the main principle that a relatively accurate two-dimensional calculation model and equivalent parameters are obtained through three-dimensional field simulation. A large number of researches show that the field-road combination method provides convenience for solving the problem of determining equivalent parameters in engineering design. The invention applies the field-circuit combination method to the acquisition of the equivalent model and parameters of the power element, and has greater novelty and application value.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for acquiring an equivalent model and parameters of a power element based on field and circuit combination.
The purpose of the invention is realized by the following technical scheme: a method for obtaining an equivalent model and parameters of a power element based on field-circuit combination is designed, and comprises the following steps:
step1, acquiring structure and size parameters of the power element;
step2, establishing a three-dimensional structure model of the power element in ANSYS three-dimensional simulation software;
step3, applying a low-voltage traveling wave test to the three-dimensional structure model of the Step2 to obtain the unit Step response of the power element;
step4, combining the connection structure of the power element and other elements to give a qualitative equivalent circuit model of the power element, if the power element and other elements have a direct connection structure, determining that the qualitative equivalent circuit model of the power element is a series connection of an inductor and a resistor, and if the power element and other elements have a fracture or a height to ground, determining that the qualitative equivalent circuit model of the power element is a capacitor;
and Step5, acquiring specific parameters of the qualitative circuit model of the power element according to the principle that the qualitative circuit model acquired in the Step4 is matched with the unit Step response of the power element.
In the above-described configuration, in Step3, the specific parameters of the equivalent circuit element of the power element are calculated by using the finite element method.
In the above scheme, the finite element method comprises the steps of:
1) establishing an equivalent integral expression of a problem solution differential equation according to a variation principle;
2) carrying out mesh subdivision on the whole solution domain according to the geometric characteristics of the solution domain;
3) according to the number of the divided unit nodes and the requirement on approximation precision, selecting an interpolation function meeting the requirement as a unit basis function, and approximating the solving function by a linear combination expression of the unit basis function to obtain an algebraic equation containing a specific coefficient;
4) and carrying out overall synthesis on the unit finite element equations in the whole solution area to obtain the electric field distribution solution of the whole solution area.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention effectively solves the problem that the simulation result is greatly different from the actual result caused by the fact that the prior power element model and empirical parameters are continuously used in the prior art.
2. The invention has the characteristics of simple modeling method, visual and reliable model, reasonable parameter selection and the like.
3. The invention improves the reliability of the simulation result, avoids repeated simulation and test adjustment, saves a large amount of manpower, material resources and financial resources, and improves the working efficiency and the working effect.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic flow chart of a method for obtaining an equivalent model and parameters of a power element based on field-line integration;
FIG. 2 is a schematic structural diagram of a GIS isolating switch in the embodiment of the invention;
fig. 3 is a schematic grid division diagram of a GIS isolating switch in the embodiment of the present invention;
fig. 4 is a cloud diagram of electric field intensity distribution inside the GIS isolating switch in the embodiment of the invention.
In the figure: 1-a shell; 2-moving contact shielding case; 3-moving contact; 4, static contact; 5-a stationary side insulation basin; 6-moving side insulation basin; 7-static contact shielding case; 8-insulating support.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.
As shown in fig. 1, the present invention provides a method for obtaining an equivalent model and parameters of a power element based on field-circuit combination, which includes the following steps:
step1, acquiring structure and size parameters of the power element;
step2, establishing a three-dimensional structure model of the power element in ANSYS three-dimensional simulation software;
and Step3, applying a low-voltage traveling wave test to the three-dimensional structure model of the Step2 to obtain the unit Step response of the power element. The method for calculating the specific parameters of the equivalent circuit element of the power element by adopting the finite element method comprises the following steps:
1) establishing an equivalent integral expression of a problem solution differential equation according to a variation principle;
2) carrying out mesh subdivision on the whole solution domain according to the geometric characteristics of the solution domain;
3) according to the number of the divided unit nodes and the requirement on approximation precision, selecting an interpolation function meeting the requirement as a unit basis function, and approximating the solving function by a linear combination expression of the unit basis function to obtain an algebraic equation containing a specific coefficient;
4) and carrying out overall synthesis on the finite element equations in the whole solution area to obtain the electric field distribution solution of the whole solution area.
And Step4, combining the connection structure of the power element and other elements to give a qualitative equivalent circuit model of the power element, if the power element and other elements have a direct connection structure, determining that the qualitative equivalent circuit model of the power element is a series connection of an inductor and a resistor, and if the power element and other elements have a fracture or a height to ground, determining that the qualitative equivalent circuit model of the power element is a capacitor.
And Step5, acquiring specific parameters of the qualitative circuit model of the power element according to the principle that the qualitative circuit model acquired in the Step4 is matched with the unit Step response of the power element.
The embodiment of the invention takes the GIS isolating switch as an example, and obtains an equivalent model and related parameters of the GIS isolating switch in a two-dimensional simulation circuit.
The GIS disconnecting switch is structurally schematically shown in fig. 2, and comprises a shell 1, a moving contact shielding case 2, a moving contact 3, a static contact 4, a static side insulating basin 5, a moving side insulating basin 6, a static contact shielding case 7 and an insulating support 8, wherein the shell 1 is a metal grounding conductor, and the structure and size parameters of the GIS disconnecting switch are obtained. The gas chamber structure of the extra-high voltage GIS isolating switch is not a symmetrical mechanism, then a qualitative circuit model is established according to the whole area of the GIS isolating switch, and the GIS isolating switch has no fracture after being closed, so the qualitative equivalent circuit model is formed by connecting an inductance element and a resistance element in series; and after the GIS isolating switch is disconnected, a fracture gap exists between the moving contact and the static contact, so that the qualitative equivalent circuit model of the GIS isolating switch is a capacitance element.
The gas chamber structure of the GIS isolating switch takes a metal tank shell as a boundary, and three media are involved in electric field calculation and are sequentially SF inside a gas chamber of the isolating switch 6 Gas, an insulator made of epoxy resin, and copper metal, wherein SF 6 The relative dielectric constant of gas is 1.002, the relative dielectric constant of epoxy resin is 3.8, the relative dielectric constant of metal copper is 2000, and the 3 relative dielectric constants are environmental material parameters necessary for calculating the electric field by the self-calculation program of ANSYS three-dimensional simulation software. A three-dimensional structure model of the GIS isolating switch is established in ANSYS three-dimensional simulation software, a bottom-to-top method is adopted during three-dimensional modeling, a surface is generated according to a key point generating line, and finally a body is generated.
Finite element calculations are then performed, including the steps of: 1) pretreatment: the pre-treatment mesh subdivision of the extra-high voltage GIS isolating switch is a key link, and as the sizes of parts of elements are smaller, the embodiment of the invention adopts an intelligent mesh dividing method, local refinement is carried out at a place with smaller curvature by adopting Solid122 units, the line is firstly subdivided, and then the whole part is subdivided, as shown in figure 3. 2) And (3) finite element calculation: the moving contact and the moving side conductor are loaded with high potential 898kV, the metal shell and the static side conductor are loaded with zero potential, the gap distance is 0-230mm, and the GIS disconnecting switch electric field simulation calculation under different gap distances is carried out at the interval of 10mm, as shown in figure 4. 3) And (3) post-treatment: and processing the calculated data, including drawing an electric field intensity cloud chart, calculating the electric field intensity, deriving the calculated data, and obtaining specific parameters of the equivalent circuit element according to an electric field energy method.
Under the condition of closing the isolating switch, the isolating switch is equivalent to a small section of lossless conducting wire, and parameters can be ignored; under the condition that the isolating switch is opened, the isolating switch is equivalent to a capacitance element which is connected in series in a circuit, the value is 3PF according to a simulation result, and the magnitude of the simulation result is consistent with the magnitude of an empirical value and is accurate.
While the present invention has been described with reference to the particular embodiments illustrated in the drawings, which are meant to be illustrative only and not limiting, it will be apparent to those of ordinary skill in the art in light of the teachings of the present invention that numerous modifications can be made without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (1)
1. A method for obtaining an equivalent model and parameters of a power element based on field-circuit combination is characterized by comprising the following steps:
step1, acquiring structure and size parameters of the power element;
step2, establishing a three-dimensional structure model of the power element in ANSYS three-dimensional simulation software;
step3, applying a low-voltage traveling wave test to the three-dimensional structure model of the Step2 to obtain the unit Step response of the power element;
calculating specific parameters of a qualitative equivalent circuit model of the power element by adopting a finite element method;
the finite element method comprises the following steps:
1) establishing an equivalent integral expression of a problem solution differential equation according to a variation principle;
2) carrying out mesh subdivision on the whole solution domain according to the geometric characteristics of the solution domain;
3) according to the number of the divided unit nodes and the requirement on approximation precision, selecting an interpolation function meeting the requirement as a unit basis function, and approximating the solving function by a linear combination expression of the unit basis function to obtain an algebraic equation containing a specific coefficient;
4) overall synthesis is carried out on the unit finite element equations in the whole solution area to obtain the electric field distribution solution of the whole solution area;
step4, combining the connection structure of the power element and other elements to give a qualitative equivalent circuit model of the power element, if the power element and other elements have a direct connection structure, determining that the qualitative equivalent circuit model of the power element is a series connection of an inductance element and a resistance element, and if the power element and other elements have a fracture or a ground height, determining that the qualitative equivalent circuit model of the power element is a capacitance;
and Step5, acquiring specific parameters of the qualitative equivalent circuit model of the power element according to the principle that the qualitative equivalent circuit model acquired in the Step4 is matched with the unit Step response of the power element.
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Citations (3)
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| CN102663215A (en) * | 2012-05-14 | 2012-09-12 | 重庆大学 | Method for evaluating ice resistance of tower-wire coupled system of overhead transmission line |
| CN105243197A (en) * | 2015-09-21 | 2016-01-13 | 国网河南省电力公司电力科学研究院 | Single-core power cable resonance analysis method based on finite element simulation and equivalent circuit |
| CN105574266A (en) * | 2015-12-16 | 2016-05-11 | 西安交通大学 | Multi-population genetic algorithm based comprehensive optimization design method for electrical and mechanical performance of basin-type insulator |
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| CN101923591B (en) * | 2010-08-09 | 2012-04-04 | 西安理工大学 | Three-dimensional optimal design method of asymmetric cusp magnetic field used for MCZ single crystal furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102663215A (en) * | 2012-05-14 | 2012-09-12 | 重庆大学 | Method for evaluating ice resistance of tower-wire coupled system of overhead transmission line |
| CN105243197A (en) * | 2015-09-21 | 2016-01-13 | 国网河南省电力公司电力科学研究院 | Single-core power cable resonance analysis method based on finite element simulation and equivalent circuit |
| CN105574266A (en) * | 2015-12-16 | 2016-05-11 | 西安交通大学 | Multi-population genetic algorithm based comprehensive optimization design method for electrical and mechanical performance of basin-type insulator |
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Effective date of registration: 20200730 Address after: 710199 No. 669, middle route, Xi'an, Shaanxi, Changan District Applicant after: STATE GRID SHAANXI ELECTRIC POWER Research Institute Applicant after: CHINA ELECTRIC POWER RESEARCH INSTITUTE Co.,Ltd. Applicant after: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute Applicant after: MAINTENANCE COMPANY OF STATE GRID SHANDONG ELECTRIC POWER Co. Address before: 710199 No. 669, middle route, Xi'an, Shaanxi, Changan District Applicant before: STATE GRID SHAANXI ELECTRIC POWER Research Institute Applicant before: CHINA ELECTRIC POWER RESEARCH INSTITUTE Co.,Ltd. Applicant before: Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute |
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