CN104616863B - A kind of orthogonal iron core type controlled reactor containing wedge-shaped slot and under D.C. magnetic biasing the computational methods of the equivalence length of magnetic path - Google Patents
A kind of orthogonal iron core type controlled reactor containing wedge-shaped slot and under D.C. magnetic biasing the computational methods of the equivalence length of magnetic path Download PDFInfo
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Abstract
The invention discloses a kind of orthogonal iron core type controlled reactor containing wedge-shaped slot and under D.C. magnetic biasing equivalence the length of magnetic path computational methods, controlled reactor includes work iron core and the control iron core with wedge-shaped slot；The present invention drives wedge-shaped slot on control iron core can effectively reduce its output harmonic wave content, overcomes the defect that conventional reactor harmonic content is high, improves the service behaviour of reactor.Simultaneously, the calculating of the alternating current equivalent length of magnetic path adopts the dedicated emulated software of electromagnetic field (ANSOFT), deriving the magnetic induction data in particular cross section in orthogonal iron core type controlled reactor, data are processed by the algorithm according to studying, thus calculating the size of equivalent magnetic circuit length.This approach reduce traditional method due to inner-core magnetization in confused situation and to the error brought of equivalent magnetic circuit length computation, the ac magnetization curve making reactor is more scientific, provides guarantee for the iron loss and other characteristic studying orthogonal iron core type controlled reactor.
Description
Technical field
The invention belongs to controlled reactor design field, be specifically related to a kind of orthogonal iron core type controlled reactor containing wedge-shaped slot and under D.C. magnetic biasing equivalence the length of magnetic path computational methods.
Background technology
Currently, orthogonal iron core type controlled reactor is as a kind of novel reactance value continuous adjustable reactor, and design suppresses the new structure of its harmonic content to be the inevitable requirement that REgulatable reactor develops.Due to special orthohormbic structure, compared with other reactors, the coupling of orthogonal iron core type controlled reactor magnetic flux is more complicated, and equivalent magnetic circuit length computation is very difficult.Therefore, how to design the controlled reactor that the harmonic content of unique texture is little, and application engineering electromagnetic field analysis finds and reasonably determines that the computational methods of alternating current equivalent magnetic circuit become the quick key designing novel high-performance controlled reactor.
The core structure of general iron core reactor many employings transformer type, in engineering, the general centrage using the geometric center lines of this reactor as equivalent magnetic circuit, therefore, is easy for calculating this type of reactor equivalent magnetic circuit length.But for the special construction of orthogonal iron core type controlled reactor, due to the magnetized inhomogeneity of internal material, it is difficult to adopt traditional method to calculate the length of magnetic path of equivalence.
Summary of the invention
For above-mentioned technical need, the invention provides a kind of orthogonal iron core type controlled reactor containing wedge-shaped slot and under D.C. magnetic biasing equivalence the length of magnetic path computational methods, the harmonic content of its output electric current can be reduced, by rational algorithm equivalent process, calculate the equivalent magnetic circuit length of orthogonal iron core type controlled reactor.
A kind of orthogonal iron core type controlled reactor containing wedge-shaped slot, including control iron core and the work iron core of U-shape structure, the U-shaped side width of described control iron core and work iron core is identical with jib side width, controls core ends and adopts orthogonal form to engage with work core ends；The U-shaped side of described control core ends is along with wedge-shaped indentation.
Above-mentioned orthogonal iron core type controlled reactor is the computational methods of the equivalence length of magnetic path under D.C. magnetic biasing, comprise the steps:
(1) for the structure of described orthogonal iron core type controlled reactor, corresponding three-dimensional simulation model is set up；The length L2 of work iron core alternating current equivalent magnetic circuit is directly calculated according to three-dimensional simulation model size；
(2) after described three-dimensional simulation model being divided into multiple finite element, this three-dimensional simulation model is carried out simulation analysis, obtain the magnetic potential of each finite element node, and then determine the magnetic induction of any point in finite element；
(3) make jib side and the horizontal direction parallel of control iron core, intercept and control the horizontal plane α at jib centrage place on iron core, derive the Distribution of Magnetic Field data of this horizontal plane α；
(4) put into rectangular coordinate system by horizontal plane α is arranged in the cross section controlling core portion, make this cross section control the edge line of core ends as the x-axis of coordinate system, x=0 place straight line in this kernel of section line respective coordinates system；
(5) according to the Distribution of Magnetic Field data on cross section, x=0 place straight line uniformly takes several points, calculate the average magnetic induction intensity value of these points；And then find induction level and the immediate point of this average magnetic induction intensity on this line, record the coordinate figure of this point and using this point as the equivalent coordinate points controlling iron core alternating current equivalent magnetic circuit process；
(6) it is spaced apart step-length to x=0 place straight line both sides move step by step to the left and right with certain length, with the iron core alternating current equivalent magnetic circuit position that works for border, equivalent coordinate points corresponding on straight line after determining these translations according to step (5)；
(7) a series of equivalence coordinate points determined in step (6) are fitted, obtain controlling the alternating current equivalent magnetic circuit of iron core and calculating the length L1 of this alternating current equivalent magnetic circuit, make L1 and L2 be added the total length namely obtaining described orthogonal iron core type controlled reactor alternating current equivalent magnetic circuit.
In described step (1), for the structure of orthogonal iron core type controlled reactor, ANSOFT (finite simulation element analysis software) environment is set up the three-dimensional simulation model of correspondence.
In described step (1), after setting up three-dimensional simulation model, emulation initial condition is set and namely sets alternating voltage and the DC current of controlled reactor.
Described finite element is tetrahedral structure.
In described step (7), it is determined that utilize Matlab to carry out linear fit after a series of equivalence coordinate points gone out, to obtain function curve and the function expression thereof of correspondence；This function curve is the alternating current equivalent magnetic circuit controlling iron core, and then passes through the integral operation length L1 in the hope of this alternating current equivalent magnetic circuit.
When the working volts alternating current at Working winding two ends maintains certain amplitude, change the DC control current controlling winding two ends and can change the magnetic saturation degree of iron core in orthogonal iron core type controlled reactor, due to the nonlinear characteristic of magnetization curve, the reactance value of orthogonal iron core type controlled reactor also can be regulated accordingly.The present invention drives wedge-shaped slot on control iron core can effectively reduce its output harmonic wave content, overcomes the defect that conventional reactor harmonic content is high, improves the service behaviour of reactor.Simultaneously, the calculating of the alternating current equivalent length of magnetic path of the present invention adopts the dedicated emulated software of electromagnetic field (ANSOFT), derive the magnetic induction data in particular cross section in orthogonal iron core type controlled reactor, by rational algorithm, data are processed, and then calculate the size of equivalent magnetic circuit length, thus the magnetization curve of the orthogonal iron core type controlled reactor obtained under different D.C. magnetic biasings.This approach reduce traditional method due to inner-core magnetization in confused situation and to the error brought of equivalent magnetic circuit length computation, the ac magnetization curve making reactor is more scientific, iron loss and other characteristic for studying orthogonal iron core type controlled reactor provide guarantee, and also the engineering design for orthogonal iron core type controlled reactor is provided convenience.
Accompanying drawing explanation
Fig. 1 is the structural representation of the orthogonal iron core type controlled reactor of the present invention.
Fig. 2 is the alternating current equivalent magnetic circuit schematic diagram of the orthogonal iron core type controlled reactor of the present invention.
Fig. 3 is the schematic flow sheet of equivalent magnetic circuit length calculation method of the present invention.
Fig. 4 controls the matched curve figure of equivalent magnetic circuit on iron core.
Detailed description of the invention
In order to more specifically describe the present invention, below in conjunction with the drawings and the specific embodiments, technical scheme is described in detail.
As it is shown in figure 1, the orthogonal iron core type controlled reactor of the present invention includes controlling iron core 1, work iron core 2, Working winding 3, controlling winding 4, DC control supply 5, ac working power supply 6；Working winding 3 is wound on work iron core 2, Working winding 3 liang termination ac working power supply 6；Control winding 4 to be wound on control iron core 1, control winding 4 liang termination DC control supply 5；
The U-shaped side width controlling iron core 1 and work iron core 2 is identical with jib side width, controls iron core 1 end and adopts orthogonal form to engage with work iron core 2 end；Control the U-shaped side of iron core 1 end along with wedge-shaped indentation.
As it is shown on figure 3, present embodiment orthogonal iron core type controlled reactor equivalent magnetic circuit length calculation method, specifically comprise the following steps that
(1) shown in the orthogonal iron core type controlled reactor structural representation of Fig. 1, finite element emulation software ANSOFT environment is set up three-dimensional simulation model (as experimental prototype, parameter is: DC control winding 245 circle, alternate current operation winding 240 circle, wire diameter 0.7mm, iron core adopts 0.35mm thickness grain-oriented Si steel sheet to be overrided to form, iron core parameter a=16mm, k=35mm, d=50mm)；So-called FInite Element, being exactly that whole region segmentation becomes many only small subregions, these subregions are commonly referred to finite element, are applied in these subregions by the principle solving boundary value problem, solve each zonule, then the result summation of each zonule is got up to obtain the solution in whole region.
(2) emulation initial condition is arranged, and working volts alternating current sets 80V, and DC control current sets 0.5A；
(3) orthogonal iron core type controlled reactor phantom is carried out mesh generation, present embodiment adopts four node tetrahedral grid unit to be three-dimensional grid subdivision unit, it is split into 1000 finite elements altogether, then ANSOFT emulation is carried out, to obtain the Distribution of Magnetic Field in orthogonal iron core type controlled reactor each unit；
(4) intercept plane α, the Fig. 2 at place, U-shaped jib center in the horizontal direction to show iron core along remaining core structure schematic diagram after α planar interception.Black dotted lines L1 controls the alternating current equivalent magnetic circuit trend in iron core on this plane, and solid black lines L2 is the alternating current equivalent length of magnetic path in work iron core.Deriving this plane according to simulation result and arrange the Distribution of Magnetic Field data of lower operation in initial condition, the face α of making even is arranged in the data of DC control iron core as valid data；
(5) this cross section is placed in rectangular coordinate system, according to Distribution of Magnetic Field data in the control iron core that step (4) obtains, x=0 place straight line on average takes 30 points, calculates their average magnetic induction intensity value；
(6) find the immediate point of average magnetic induction intensity calculated in induction level and step (5) on this line, and record the coordinate figure of its correspondence, using this coordinate equivalent coordinate points as alternating current equivalent magnetic circuit process；
(7) x=0 straight line constantly translates to coordinate axes both sides with ± 0.5mm for step-length, calculates equivalent coordinate points corresponding on these straight lines respectively；
(8) judge whether the straight line after now translation exceedes geometric center lines respective value P in X-axis in phantom alternate current operation iron core；If not less than, then x straight line continues to translate to coordinate axes both sides；If more than P value, then exit circulation；
(9) a series of equivalence coordinate points calculated for previous cycles are imported Matlab and carry out linear fit, obtain fitting function image as shown in Figure 4, and then obtain fitting function expression formula y=-0.045x2+13.03；
(10) when above-mentioned steps obtains fitting function expression formula, obtain controlling the alternating current equivalent length of magnetic path L1 in iron core by integral operation, it should be noted that L1 is only not the integrated value of matching camber line, also need to add two corresponding length of straigh line in figure 4 above；
(11) due to the symmetry of magnetic structure in work iron core, its alternating current equivalent length of magnetic path L2 can directly calculate according to phantom size and obtain, and the symmetry of magnetic circuit makes calculating be greatly simplified；
(12) the alternating current equivalent length of magnetic path L1 in control iron core is added with the alternating current equivalent length of magnetic path L2 in work iron core and obtains the alternating current equivalent length of magnetic path total in reactor.
The above-mentioned description to embodiment is to be understood that for ease of those skilled in the art and apply the present invention.Above-described embodiment obviously easily can be made various amendment by person skilled in the art, and General Principle described herein is applied in other embodiments without through performing creative labour.Therefore, the invention is not restricted to above-described embodiment, those skilled in the art's announcement according to the present invention, the improvement made for the present invention and amendment all should within protection scope of the present invention.
Claims (5)
1. the computational methods of the equivalence length of magnetic path under D.C. magnetic biasing of the orthogonal iron core type controlled reactor containing wedge-shaped slot, described orthogonal iron core type controlled reactor includes control iron core and the work iron core of U-shape structure, the U-shaped side width of described control iron core and work iron core is identical with jib side width, controls core ends and adopts orthogonal form to engage with work core ends；The U-shaped side of described control core ends is along with wedge-shaped indentation；
Described computational methods comprise the steps:
(1) for the structure of described orthogonal iron core type controlled reactor, corresponding three-dimensional simulation model is set up；The length L2 of work iron core alternating current equivalent magnetic circuit is directly calculated according to three-dimensional simulation model size；
(2) after described three-dimensional simulation model being divided into multiple finite element, this three-dimensional simulation model is carried out simulation analysis, obtain the magnetic potential of each finite element node, and then determine the magnetic induction of any point in finite element；
(3) make jib side and the horizontal direction parallel of control iron core, intercept and control the horizontal plane α at jib centrage place on iron core, derive the Distribution of Magnetic Field data of this horizontal plane α；
(4) put into rectangular coordinate system by horizontal plane α is arranged in the cross section controlling core portion, make this cross section control the edge line of core ends as the x-axis of coordinate system, x=0 place straight line in this kernel of section line respective coordinates system；
(5) according to the Distribution of Magnetic Field data on cross section, x=0 place straight line uniformly takes several points, calculate the average magnetic induction intensity value of these points；And then find induction level and the immediate point of this average magnetic induction intensity on this line, record the coordinate figure of this point and using this point as the equivalent coordinate points controlling iron core alternating current equivalent magnetic circuit process；
(6) it is spaced apart step-length to x=0 place straight line both sides move step by step to the left and right with certain length, with the iron core alternating current equivalent magnetic circuit position that works for border, equivalent coordinate points corresponding on straight line after determining these translations according to step (5)；
(7) a series of equivalence coordinate points determined in step (6) are fitted, obtain controlling the alternating current equivalent magnetic circuit of iron core and calculating the length L1 of this alternating current equivalent magnetic circuit, make L1 and L2 be added the total length namely obtaining described orthogonal iron core type controlled reactor alternating current equivalent magnetic circuit.
2. equivalent magnetic circuit length calculation method according to claim 1, it is characterised in that: in described step (1), for the structure of orthogonal iron core type controlled reactor, ANSOFT environment is set up the three-dimensional simulation model of correspondence.
3. equivalent magnetic circuit length calculation method according to claim 1, it is characterised in that: in described step (1), after setting up three-dimensional simulation model, emulation initial condition is set and namely sets alternating voltage and the DC current of controlled reactor.
4. equivalent magnetic circuit length calculation method according to claim 1, it is characterised in that: described finite element is tetrahedral structure.
5. equivalent magnetic circuit length calculation method according to claim 1, it is characterized in that: in described step (7), Matlab is utilized to carry out linear fit after a series of equivalence coordinate points determined, to obtain function curve and the function expression thereof of correspondence；This function curve is the alternating current equivalent magnetic circuit controlling iron core, and then passes through the integral operation length L1 in the hope of this alternating current equivalent magnetic circuit.
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Effective date of registration: 20191009 Address after: 315040 Zhejiang city of Ningbo province high tech Zone Jinghua Road No. 168 Patentee after: Ningbo Ningbian Power Sci-Tech Co., Ltd. Address before: 310014 Hangzhou city in the lower reaches of the city of Zhejiang Wang Road, No. 18 Patentee before: Zhejiang University of Technology |
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