CN108231389B - Filter reactor iron core loss design method - Google Patents
Filter reactor iron core loss design method Download PDFInfo
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- CN108231389B CN108231389B CN201710399429.6A CN201710399429A CN108231389B CN 108231389 B CN108231389 B CN 108231389B CN 201710399429 A CN201710399429 A CN 201710399429A CN 108231389 B CN108231389 B CN 108231389B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
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Abstract
The invention discloses a filter reactor iron core loss design method for an active filter and a static reactive power compensation device, which comprises the following steps: obtaining the relation between the inductance L of the filter reactor and the rated current IN through the relation between the ripple current coefficient alpha and the rated current IN, and further obtaining the relation between the voltage drop delta U of the filter reactor and the rated current IN; calculating the magnetic flux density Bm of the filter reactor corresponding to the sine wave according to an electromagnetic induction formula, and correcting the Bm according to the current distortion waveform; calculating unit kilogram loss PFe1 corresponding to maximum magnetic flux density Bm caused by main wave rated current IN and unit kilogram loss PFe2 corresponding to magnetic flux density swing Delta Bm caused by ripple current to obtain unit kilogram total loss PFe of the iron core; and combining with temperature rise calculation, sampling at one time to obtain a qualified product. The invention avoids the defects of proofing for the client, and returning to rework and retesting if the testing temperature is too high, thereby saving time and cost.
Description
Technical Field
The invention relates to the technical field of reactors, in particular to a filter reactor iron core loss design method for an active filter APF and a static var compensator SVG.
Background
An Active Power Filter (APF) is a novel power electronic device for dynamically inhibiting harmonic waves and compensating reactive power, can quickly track and compensate harmonic waves with different sizes and frequencies, is called as Active, and is used for a passive LC filter, only passively absorbing the harmonic waves with fixed frequency and size, and the APF can sample load current and separate each harmonic wave from reactive power to control and actively output the size, frequency and phase of the current, and quickly respond to counteract the corresponding current in the load, thereby realizing dynamic tracking compensation and compensating the harmonic waves and the reactive power and unbalance.
Static Var compensators (SVG) are typical power electronics devices, which are composed of three basic functional modules: the device comprises a detection module, a control operation module and a compensation output module. The working principle is that current information of an external CT detection system is used, and then current information such as PF, S, Q and the like is analyzed through a control chip; then the controller gives out a compensating driving signal, and finally an inversion loop formed by the power electronic inversion circuit gives out compensating current.
The existing filter reactor iron core loss design for APF and SVG firstly samples a customer, if the test temperature is too high, the process returns to rework, and then the test is carried out until a qualified product is sampled. Moreover, if the magnetic flux density is too low, the amount of material used is increased, resulting in high cost.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a filter reactor iron core loss design method which can obtain the allowable magnetic flux density and iron core loss of APF and SVG and can obtain qualified products by one-time proofing by combining temperature rise calculation, so that the defects that the prior art can sample customers, and if the test temperature is too high, the samples are returned to be remade and retested are avoided, and the time and the cost are saved.
In order to solve the technical problems, the invention adopts the following technical scheme:
a filter reactor iron core loss design method comprises the following steps:
through ripple current coefficient alpha and rated current INObtaining the inductance L and the rated current I of the filter reactorNTo further obtain the voltage drop delta U and the rated current I of the filter reactorNThe relationship of (1);
calculating the magnetic flux density B of the filter reactor corresponding to the sine wave according to an electromagnetic induction formulamAnd for current distortion waveforms, pair BmCorrecting;
by calculating the main wave rated current INMaximum magnetic flux density B causedmCorresponding unit kilogram loss PFe1And magnetic flux density swing Delta B caused by ripple currentmCorresponding unit kilogram loss PFe2Obtaining the total loss P of the iron core per kilogramFe；
And combining with temperature rise calculation, sampling at one time to obtain a qualified product.
The ripple current coefficient alpha is less than or equal to 20 percent.
The ripple current coefficient alpha and the rated current INThe relationship of (1) is: alpha ═ UDC/8/fs/L/INIf the inductance L of the filter reactor is equal to UDC/(20％IN)/8/fsWherein, UDCRated voltage for the direct current bus; f. ofsIs the carrier frequency; and L is the inductance of the filter reactor.
The voltage drop delta U of the filter reactor is 2 pif1LIN。
The magnetic flux density Bm of the filter reactor corresponding to the sine wave is delta U/4.44/f1/As/N, wherein f1The voltage frequency is usually 50Hz, As is the cross-sectional area of the iron core of the filter reactor, N is the winding number of the reactor coil, and 4.44 is the sine wave form factor.
The main wave rated current INMaximum magnetic flux density B causedmCorresponding unit kilogram loss PFe1＝af1 bBm cWherein f is1Is the dominant frequency, BmThe dominant wave maximum flux density; magnetic flux density swing Delta B caused by the ripple currentmCorresponding unit kilogram loss PFe2＝afs bΔBm cWherein f issIs the carrier frequency, Δ BmMaximum flux density swing for ripple current, a: 0.00071-0.00086; b: 1.460-1.510, c: 1.92-2.05.
The total loss P of the iron core per kilogramFe＝(PFe1+PFe2)*MFeWherein M isFeThe iron weight of the filter reactor.
If the total loss per kilogram of the iron core exceeds the allowable temperature rise value, the main wave corresponding B is reduced by increasing the sectional area of the iron core or increasing the number of winding turnsmThe value is obtained.
The filter reactor adopts a silicon steel sheet.
Compared with the prior art, the method has the advantages that the highest cost performance is achieved through accurate design, the allowable magnetic flux density and the iron core loss of the APF and SVG devices are obtained, and qualified products are obtained through one-time proofing by combining temperature rise calculation, so that the defects of proofing for customers, returning to rework and retesting if the testing temperature is too high are avoided, and time and cost are saved.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1: the invention relates to a flow chart of a filter reactor iron core loss design method;
FIG. 2: the invention discloses a schematic diagram of an active filter APF and a static var compensator SVG circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. 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 embodiments of the present invention will be described in further detail with reference to the drawings attached hereto.
As shown in fig. 1, the method for designing the iron core loss of a filter reactor provided by the present invention includes:
s1, passing ripple current coefficient alpha and rated current INObtaining the inductance L and the rated current I of the filter reactorNTo further obtain the voltage drop delta U and the rated current I of the filter reactorNThe relationship of (1);
s2, calculating the magnetic flux density B of the filter reactor corresponding to the sine wave according to the electromagnetic induction formulamAnd for current distortion waveforms, pair BmCorrecting;
s3, calculating the main wave rated current INMaximum magnetic flux density B causedmCorresponding unit kilogram loss PFe1And magnetic flux density swing Delta B caused by ripple currentmCorresponding unit kilogram loss PFe2Obtaining the total loss P of the iron core per kilogramFe；
And S4, combining with the temperature rise calculation, sampling at one time to obtain a qualified product.
In specific implementation, the maximum magnetic flux density B of the iron core of the filter reactormThe design of (2) is as follows:
in the above S1, the ripple current coefficient α is generally required to be less than or equal to 20%.
The ripple current coefficient alpha and the rated current INThe relationship of (1) is: alpha ═ UDC/8/fs/L/INIf the inductance L of the filter reactor is equal to UDC/(20％IN)/8/fsWherein, UDCRated voltage for the direct current bus; f. ofsIs the carrier frequency; and L is the inductance of the filter reactor.
The voltage drop delta U of the filter reactor is 2 pi f1LIN。
According to the above S2, the sine wave corresponds to the magnetic flux density B of the filter reactorm＝ΔU/4.44/f1/As/N, wherein f1The voltage frequency is usually 50Hz, As is the cross-sectional area of the iron core of the filter reactor, N is the winding number of the reactor coil, and 4.44 is the sine wave form factor.
In S2, B is the current distortion waveformmCorrected to obtain Bm1And Bm2In which B ism1The magnetic flux density of the SVG filter reactor; b ism2Is the flux density of the APF filter reactor.
As shown in fig. 2, the active filter APF and the static var compensator SVG are connected in parallel with the filter reactor to form a circuit loop. Preferably, the maximum current crest factor C corresponds to the extreme application occasions of APF and SVGFAnd the current primary frequency f1 are shown in the following table:
| name (R) | CF | f1(Hz) |
| APF | 3 | 250 |
| SVG | 2.15 | 50 |
According to the magnetic field theory, the maximum value of the magnetic flux density corresponds to the maximum value of the magnetic field intensity and the current peak value, and the current peak value coefficient C is obtainedF1.414, which is no longer a sine wave, will CFSubstituting 2.15 and 3 into BmThe following can be obtained:
SVG filter reactor
Bm1＝2.15/1.414*ΔU/4.44/f/As/N≈1.5ΔU/4.44/f1/As/N；
APF filter reactor
Bm2＝3/1.414*ΔU/4.44/f/As/N≈2.15ΔU/4.44/f1/As/N。
The filter reactor adopts silicon steel sheets. In the implementation, the SVG and APF filter reactors of the invention use different silicon steel sheet maximum magnetic flux density values.
SVG filter reactor (considering volume factor generally selecting oriented silicon steel sheet)
Oriented silicon steel sheet: the saturation magnetic flux density is about 1.95T;
from the above-mentioned formulas, can be usedm1’]＝1.95/1.5＝1.3T；
APF filter reactor (considering volume factor generally selecting oriented silicon steel sheet)
Oriented silicon steel sheet: the saturation magnetic flux density is about 1.95T;
from the above-mentioned formulas, can be usedm2’]＝1.95/2.15＝0.9T。
In implementation, the method for calculating the iron core loss of the APF and SVG filter reactors comprises the following steps:
filter reactor magnetic flux density swing amplitude delta Bm＝α*Bm；
The filter reactor core loss is calculated as follows:
the main wave rated current INMaximum magnetic flux density B causedmCorresponding unit kilogram loss PFe1＝af1 bBm cAnd B ism1.3T ≦ for SVG or 0.9T (for APF), wherein f1Is the dominant frequency, BmThe dominant wave maximum flux density; magnetic flux density swing Delta B caused by the ripple currentmCorresponding unit kilogram loss PFe2＝afs bΔBm cWherein f issFor APF/SVG carrier frequency, Δ BmThe maximum flux density swing for ripple current.
In the above formula, a, b, and c are constants, a: 0.00071-0.00086; b: 1.460-1.510, c: 1.92-2.05.
The total loss P of the iron core per kilogramFe＝(PFe1+PFe2)*MFeWherein M isFeThe iron weight of the filter reactor.
In implementation, if the total loss per kilogram of the iron core exceeds the allowable temperature rise value, the main wave corresponding B is reduced by increasing the sectional area of the iron core or increasing the number of winding turnsmAnd (4) recalculating until the value is qualified.
The invention achieves the highest cost performance through the accurate design, obtains the allowable magnetic flux density and the iron core loss of the APF and SVG devices, combines the temperature rise calculation, samples qualified products at one time, avoids sampling for customers, returns to rework if the test temperature is too high, and tests again, and saves time and cost.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (4)
1. A filter reactor iron core loss design method is characterized by comprising the following steps:
through ripple current coefficient alpha and rated current INObtaining the inductance L and the rated current I of the filter reactorNTo further obtain the voltage drop delta U and the rated current I of the filter reactorNThe relationship of (1);
calculating the main wave rated current I according to an electromagnetic induction formulaNMaximum magnetic flux density B causedmAnd for current distortion waveforms, pair BmCorrected Bm ═ CF/1.414)*(ΔU/4.44/f1/As/N), wherein CFIs the peak current coefficient;
by calculating the main wave rated current INCorrection value B of maximum induced magnetic flux densitym' corresponding unit kilogram loss PFe1Maximum magnetic flux density swing Delta B brought by ripple currentmCorresponding unit kilogram loss PFe2Obtaining the total loss P of the iron core per kilogramFe；
Then combining with temperature rise calculation, sampling at one time to obtain a qualified product;
the ripple current coefficient alpha and the rated current INThe relationship of (1) is: alpha ═ UDC/8/fs/L/INIf the inductance L of the filter reactor is equal to UDC/(20％IN)/8/fsWherein, UDCRated voltage for the direct current bus; f. ofsIs the carrier frequency; l is the inductance of the filter reactor;
the voltage drop delta U of the filter reactor is 2 pi f1LIN；
The main wave rated current INMaximum magnetic flux density B causedm＝ΔU/4.44/f1/As/N, wherein f1The main wave frequency is 50Hz, As is the cross section area of the iron core of the filter reactor, N is the winding number of the coil of the reactor, and 4.44 is the sine wave form coefficient;
the main wave rated current INThe unit kilogram loss P corresponding to the maximum magnetic flux density correction value BmFe1＝af1 bBm’cWherein f is1Is the dominant wave frequency; unit kilogram loss P corresponding to maximum magnetic flux density swing Delta Bm brought by ripple currentFe2＝afs bΔBm cWherein f issFor the carrier frequency, Δ Bm is the maximum flux density swing due to ripple current, Δ Bm ═ α × Bm, where a: 0.00071-0.00086; b: 1.460-1.510, c: 1.92-2.05;
the total loss P of the iron core per kilogramFe＝PFe1+PFe2。
2. The method of claim 1, wherein: the ripple current coefficient alpha is less than or equal to 20 percent.
3. The method of claim 1, wherein: if the total loss value of the iron core per kilogram exceeds the allowable temperature rise value, the value of the Bm' corresponding to the main wave is reduced by increasing the section area of the iron core or increasing the number of winding turns.
4. The method of claim 1, wherein: the filter reactor adopts a silicon steel sheet.
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| JP2012230965A (en) * | 2011-04-25 | 2012-11-22 | Hitachi Powdered Metals Co Ltd | Powder magnetic core, and manufacturing method therefor |
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