CN105911364B - The core loss measuring circuit and its method of three-phase reactor under arbitrary biasing - Google Patents
The core loss measuring circuit and its method of three-phase reactor under arbitrary biasing Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2688—Measuring quality factor or dielectric loss, e.g. loss angle, or power factor
- G01R27/2694—Measuring dielectric loss, e.g. loss angle, loss factor or power factor
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Abstract
The present invention discloses the core loss measuring circuit and its method of the three-phase reactor under arbitrary biasing, there are three magnetic core columns for three-phase reactor tool, it is set with a winding on each magnetic core column, each winding has a upper end and a lower end, measuring circuit includes ac-excited source and the magnetic bias driving source of switching frequency, the anode of magnetic bias driving source is connect with the upper end of any winding, the cathode of magnetic bias driving source connects the lower end of any winding, the lower end of other two winding connects, and the two poles of the earth in the ac-excited source of switching frequency are connected to the upper end of other two winding.Method is to obtain the voltage waveform and current waveform of corresponding ac-excited winding, and it is integrated to obtain the core loss on this two ac-excited magnetic core columns, the driving source that magnetic core column is connect is exchanged in the same way, the core loss that exchanges three times it is cumulative and divided by 2, winding loss is subtracted again, obtains total core loss of three-phase reactor.The present invention has many advantages, such as that control is simple, at low cost and is easily achieved.
Description
Technical field
The present invention relates to the core loss measuring circuits and its method of the three-phase reactor under arbitrary biasing.
Background technology
With the continuous development of switching power converter, the requirement to transfer efficiency is higher and higher.Thus to magnetic element
Core loss it is accurate measurement higher requirements are also raised.Traditional core loss measurement is generally used high_frequency sine wave
Excitation, this method is inconsistent in actual condition with magnetic core, does not consider the magnetic bias problem of magnetic core in its practical work process.And show
The considerations of having core loss measurement of magnetic bias is only limitted to single-phase reactor again.For three-phase reactor, structure and single-phase reactance
Device has significant difference, this results in the measurement method for being applied to core loss under single-phase reactor magnetic bias that cannot be applicable in.
Invention content
It is an object of the invention to overcome the deficiencies of the prior art and provide the magnetic core damages of the three-phase reactor under arbitrary biasing
Consume measuring circuit and its method.
The technical solution adopted by the present invention is：
The core loss measuring circuit of three-phase reactor under arbitrary biasing, the three-phase reactor include upper magnet yoke under
Yoke, three magnetic core columns being arranged side by side between upper magnet yoke and lower yoke are each set with a winding, each on the magnetic core column
The winding has a upper end and a lower end, and measuring circuit includes ac-excited source and the magnetic bias driving source of switching frequency, described
The anode of magnetic bias driving source is connect with the upper end of any winding, and the cathode of magnetic bias driving source connects any winding
The lower end of lower end, other two winding is connected, and the two poles of the earth in the ac-excited source of the switching frequency are connected to other two
The upper end of a winding.
The carrier frequency of the magnetic bias driving source is 50-60Hz.
The magnetic bias driving source is a capacitance, and the capacitance, which stores energy, has DC voltage initial value.
The switching frequency be the three-phase reactor application circuit in switching device working frequency.
The core loss measurement method of the arbitrary lower three-phase reactor of biasing, three windings respectively corresponding first around
Group, the second winding and the tertiary winding, the core loss measurement method include the following steps,
1) lower end of the first winding and the second winding is in series, and access is opened in the upper end of the first winding and the second winding
Close the ac-excited source of frequency；
2) magnetic bias driving source is accessed at the both ends of the tertiary winding；
3) the loss P of the magnetic core column where the first winding and the second winding is calculated12：
P12=∫ u1*i1dt (1)
Wherein u1For the voltage at the both ends of concatenated first winding and the second winding, i1For the first winding for flowing through after series connection
With the electric current of the second winding；
4) lower end of the first winding and the tertiary winding is in series, and access is opened in the upper end of the first winding and the tertiary winding
Close the ac-excited source of frequency；
5) magnetic bias driving source is accessed at the both ends of the second winding；
6) the loss P of the magnetic core column where the first winding and the tertiary winding is calculated13：
P13=∫ u2*i2dt (2)
Wherein u2For the voltage at the both ends of concatenated first winding and the tertiary winding, i2For the first winding for flowing through after series connection
With the electric current of the tertiary winding；
7) lower end of the second winding and the tertiary winding is in series, and access is opened in the upper end of the second winding and the tertiary winding
Close the ac-excited source of frequency；
8) magnetic bias driving source is accessed at the both ends of the first winding；
9) the loss P of the magnetic core column where the second winding and the tertiary winding is calculated23：
P23=∫ u3*i3dt (3)
Wherein u3For the voltage at the both ends of concatenated second winding and the tertiary winding, i3For the second winding for flowing through after series connection
With the electric current of the tertiary winding；
10) the total losses P of three-phase reactor is calculated：
P=(P12+P13+P23)/2 (4)
Wherein P12For the loss of the magnetic core column where the first winding and the second winding, P13For the first winding and the tertiary winding
The loss of the magnetic core column at place, P23For the loss of the magnetic core column where the second winding and the tertiary winding, P is the total of three-phase reactor
Loss.
11) by establishing the analysis model as the structure of the three-phase reactor, analysis in electromagnetic software
Go out the winding loss Pw of the three-phase reactor, finally calculates total core loss Pc of three-phase reactor：
Pc=P-Pw (5)
Wherein P12For the loss of the magnetic core column where the first winding and the second winding, P13For the first winding and the tertiary winding
The loss of the magnetic core column at place, P23For the loss of the magnetic core column where the second winding and the tertiary winding, P is the total of three-phase reactor
Loss, Pw are the winding loss of three-phase reactor, and Pc is total core loss of three-phase reactor.
The present invention uses above technical scheme, any one winding in three windings of three-phase reactor to be individually passed through directly
The biasing of stream or exchange, other two windings in series are passed through the ac-excited of switching frequency after getting up.Using the connection type
Ac-excited winding will not generate biasing winding interference, and ac-excited winding will not generate biasing winding interference, exchange
Voltage source can be used without using current source in excitation and bias excitation.Further, as long as obtaining the friendship of three-phase reactor
The voltage waveform and current waveform of stream excitation winding, so that it may to obtain the two ac-excited magnetic cores after being integrated the two
Loss on column exchanges the driving source that magnetic core column is connect, then this is obtained three times after exchanging three times in the same way
Loss adds up divided by 2, then subtracts winding loss, you can obtains total core loss of entire three-phase reactor.The present invention is also set
Capacitance has been set, energy has been stored and passes through the method for capacitor charging as the magnetic bias driving source with DC voltage initial value
Larger electric current (1000A) is provided, solves the problems, such as that general current source can not provide high current.The present invention utilizes three-phase
The winding of reactor itself is not necessarily to additional winding, provides magnetic bias for magnetic core to replace current source using voltage source, can test
Core loss under optional frequency magnetic bias.The present invention has many advantages, such as that control is simple, at low cost and is easily achieved.
Description of the drawings
The present invention is described in further details below in conjunction with the drawings and specific embodiments；
Fig. 1 is one of the structural schematic diagram of the core loss measuring circuit of the three-phase reactor under the arbitrary biasing of the present invention；
Fig. 2 is the second structural representation of the core loss measuring circuit of the three-phase reactor under the arbitrary biasing of the present invention；
Fig. 3 is that the magnetic bias that is independently accessed of the core loss measuring circuit of the three-phase reactor under the arbitrary biasing of the present invention encourages
Circuit analysis schematic diagram when source；
Fig. 4 is that the core loss measuring circuit of the three-phase reactor under the arbitrary biasing of the present invention is independently accessed switching frequency
Ac-excited source when circuit analysis schematic diagram；
Fig. 5 is the first winding of calculating and the of the core loss measurement method of the three-phase reactor under the arbitrary biasing of the present invention
The wiring schematic diagram of the loss of magnetic core column where two windings；
Fig. 6 is the first winding of calculating and the of the core loss measurement method of the three-phase reactor under the arbitrary biasing of the present invention
The wiring schematic diagram of the loss of magnetic core column where three winding；
Fig. 7 is the second winding of calculating and the of the core loss measurement method of the three-phase reactor under the arbitrary biasing of the present invention
The wiring schematic diagram of the loss of magnetic core column where three winding.
Specific implementation mode
As shown in one of Fig. 1-7, the core loss measuring circuit of the three-phase reactor under arbitrary biasing of the invention is described
Three-phase reactor includes upper magnet yoke and lower yoke, three magnetic core columns being arranged side by side between upper magnet yoke and lower yoke, each described
A winding is set on magnetic core column, each winding construction is identical, and all has a upper end and a lower end, the measuring circuit
Ac-excited source including switching frequency and magnetic bias driving source u0, the magnetic bias driving source u0Anode with any winding
Upper end connects, magnetic bias driving source u0Cathode connect the lower end of any winding, the lower end of other two winding is connected,
The two poles of the earth in the ac-excited source of the switching frequency are connected to the upper end of other two winding.
The magnetic bias driving source u0Carrier frequency be 50-60Hz.
As shown in Fig. 2, the measuring circuit of the present invention further includes a capacitance C, the capacitance, which stores energy, has direct current
Initial value is pressed, as the magnetic bias driving source.Due in the application of new energy, usually requiring that using higher magnitude (1000A)
Current source as excitation, and common current source is unable to get so big electric current, and big electricity is obtained using a capacitance C
Stream, first charges to capacitance C, then adds the excitation of high current to winding by capacitance C.
Just the operation principle of the core loss measuring circuit of the three-phase reactor under the arbitrary biasing of the present invention is done in detail below
Thin introduction：
It is illustrated by taking the mode of connection as shown in Figure 1 as an example, three windings correspond to the first winding 1, second respectively
The lower end of first winding 1 and the second winding 2 is first together in series by winding 2 and the tertiary winding 3, and the first winding 1 and second around
The ac-excited source of the upper end access switching frequency of group 2, voltage u1Direction and electric current i1Direction is as shown in Figure 1, in addition in third
Magnetic bias driving source, voltage u are independently accessed on winding 30Direction and electric current i0Direction it is as shown in Figure 1.According to Theory of Electromagnetic Field,
Same Name of Ends of the three-phase reactor two-by-two between winding can be determined by the voltage and current direction of each winding in Fig. 1, in Fig. 1
Asterisk indicates that the Same Name of Ends between the first winding 1 and the second winding 2, small triangle indicate between the first winding 1 and the tertiary winding 3
Same Name of Ends, small square indicates the Same Name of Ends between the second winding 2 and the tertiary winding 3.
Further, as shown in figure 3, the tertiary winding 3 is passed through just lower negative magnetic bias driving source u0When, according to right-handed helix
Rule can generate upward main flux in the magnetic core column where the tertiary winding 3, and the magnetic flux can be evenly distributed to the first winding 1
In the magnetic core column at place and the magnetic core column where the second winding 2, main flux path is formed.According to the law of electromagnetic induction, first
Induced voltage u positive under bearing can be all generated on winding 1 and the second winding 24And u5, due to the first winding 1 and the second winding 2
Lower end is concatenated, the two final induced voltages can cancel out each other.So when the tertiary winding 3 is passed through magnetic bias driving source, no
Interference voltage can be generated on the first winding 1 and the second winding 2.
Further, as shown in figure 4, only when the upper end of 1 and second winding 2 of concatenated first winding adds what the left positive right side was born
When the ac-excited source of switching frequency, then the voltage u on the first winding 16It, can be along 1 place of the first winding to be upper just lower negative
Magnetic core column where magnetic core column and the tertiary winding 3 generates main flux path, and electricity positive under upper bear is induced in the tertiary winding 3
Press u8.Voltage u on second winding 27For just, meeting is along 3 place of magnetic core column and the tertiary winding where the second winding 2 under upper bear
Magnetic core column generate main flux path, and upper just lower negative induced voltage u is induced in the tertiary winding 39.It can be seen that induction
Voltage u8And u9Direction offsets each other on the contrary.Therefore when the series connection of the lower end of the first winding 1 and the second winding 2, and in the first winding 1
When accessing the ac-excited source of switching frequency with the upper end of the second winding 2, it will not be produced on the magnetic core column where the tertiary winding 3
Raw interference voltage.
As shown in one of Fig. 5-7, the core loss measurement method of the three-phase reactor under arbitrary biasing of the invention, three
The winding corresponds to the first winding 1, the second winding 2 and the tertiary winding 3, core loss measurement method and includes the following steps respectively,
1) lower end of the first winding 1 and the second winding 2 is in series, and in the upper termination of the first winding 1 and the second winding 2
Enter the ac-excited source of switching frequency；
2) magnetic bias driving source is accessed at the both ends of the tertiary winding 3；
3) the loss P of the magnetic core column where the first winding 1 and the second winding 2 is calculated12：
P12=∫ u1*i1dt (1)
Wherein u1For the voltage at the both ends of 1 and second winding 2 of concatenated first winding, i1For flow through series connection after first around
The electric current of group 1 and the second winding 2；
4) lower end of the first winding 1 and the tertiary winding 3 is in series, and in the upper termination of the first winding 1 and the tertiary winding 3
Enter the ac-excited source of switching frequency；
5) magnetic bias driving source is accessed at the both ends of the second winding 2；
6) the loss P of the magnetic core column where the first winding 1 and the tertiary winding 3 is calculated13：
P13=∫ u2*i2dt (2)
Wherein u2For the voltage at the both ends of concatenated first winding 1 and the tertiary winding 3, i2For flow through series connection after first around
The electric current of group 1 and the tertiary winding 3；
7) lower end of the second winding 2 and the tertiary winding 3 is in series, and in the upper termination of the second winding 2 and the tertiary winding 3
Enter the ac-excited source of switching frequency；
8) magnetic bias driving source is accessed at the both ends of the first winding 1；
9) the loss P of the magnetic core column where the second winding 2 and the tertiary winding 3 is calculated23：
P23=∫ u3*i3dt (3)
Wherein u3For the voltage at the both ends of concatenated second winding 2 and the tertiary winding 3, i3For flow through series connection after second around
The electric current of group 2 and the tertiary winding 3；
10) the total losses P of three-phase reactor is calculated：
P=(P12+P13+P23)/2 (4)
Wherein P12For the loss of the magnetic core column where the first winding 1 and the second winding 2, P13For the first winding 1 and third around
The loss of magnetic core column where group 3, u1For the loss of the magnetic core column where the second winding 2 and the tertiary winding 3, P is three-phase reactor
The total losses of device；
11) by establishing the analysis model as the structure of the three-phase reactor, analysis in electromagnetic software
Go out the winding loss Pw of the three-phase reactor, finally calculates total core loss Pc of three-phase reactor：
Pc=P-Pw (5)
Wherein P12For the loss of the magnetic core column where the first winding and the second winding, P13For the first winding and the tertiary winding
The loss of the magnetic core column at place, P23For the loss of the magnetic core column where the second winding and the tertiary winding, P is the total of three-phase reactor
Loss, Pw are the winding loss of three-phase reactor, and Pc is total core loss of three-phase reactor.
The present invention uses above technical scheme, any one winding in three windings of three-phase reactor to be individually passed through partially
Magnetic pumping source, other two windings in series are passed through the ac-excited of switching frequency after getting up.It is ac-excited using the connection type
Winding will not generate bias excitation winding interference, and ac-excited winding will not generate bias excitation winding on interference, switch
Voltage source can be used without using current source in the ac-excited source of frequency and bias excitation.Further, as long as obtaining three
The voltage waveform and current waveform of the ac-excited winding of phase reactor, so that it may to obtain the two after being integrated the two
Core loss on ac-excited magnetic core column exchanges the driving source that magnetic core column is connect, then by exchanging three times in the same way
The core loss that this is obtained three times is added up divided by 2 afterwards, then subtracts winding loss, you can obtains the total of entire three-phase reactor
Core loss.The present invention is also provided with capacitance, and storing energy has DC voltage initial value, is encouraged as the magnetic bias
Source provides larger electric current (1000A) by the method for capacitor charging, and high current can not be provided by solving general current source
The problem of.The present invention utilize three-phase reactor itself winding, be not necessarily to additional winding, using voltage source come replace current source come for
Magnetic core provides magnetic bias, can test the core loss under optional frequency magnetic bias.The present invention, which has, to be controlled simple, at low cost and is easy to
The advantages that realization.
Claims (5)
1. the core loss measuring circuit of the three-phase reactor under arbitrary biasing, the three-phase reactor includes upper magnet yoke and lower magnetic
Yoke, three magnetic core columns being arranged side by side between upper magnet yoke and lower yoke are each set with a winding, Mei Gesuo on the magnetic core column
The structure for stating winding is identical, and all has a upper end and a lower end, it is characterised in that：The measuring circuit includes switching frequency
The anode of ac-excited source and magnetic bias driving source, the magnetic bias driving source is connect with the upper end of any winding, magnetic bias excitation
The cathode in source connects the lower end of any winding, and the lower end of other two winding is connected, the exchange of the switching frequency
The two poles of the earth of driving source are connected to the upper end of other two winding.
2. the core loss measuring circuit of the three-phase reactor under arbitrary biasing according to claim 1, it is characterised in that：
The carrier frequency of the magnetic bias driving source is 50-60Hz.
3. the core loss measuring circuit of the three-phase reactor under arbitrary biasing according to claim 1, it is characterised in that：
The magnetic bias driving source is a capacitance, and the capacitance stores energy, has DC voltage initial value.
4. the core loss measuring circuit of the three-phase reactor under arbitrary biasing according to claim 1, it is characterised in that：
The switching frequency be the three-phase reactor application circuit in switching device working frequency.
5. the core loss measurement method of the three-phase reactor under arbitrary biasing, uses arbitrary biasing described in claim 1
Under three-phase reactor core loss measuring circuit, it is characterised in that：Three windings correspond to the first winding, second respectively
Winding and the tertiary winding, core loss measurement method include the following steps,
1) lower end of the first winding and the second winding is in series, and switch frequency is accessed in the upper end of the first winding and the second winding
The ac-excited source of rate；
2) magnetic bias driving source is accessed at the both ends of the tertiary winding；
3) the loss P of the magnetic core column where the first winding and the second winding is calculated12：
P12=∫ u1*i1dt (1)
Wherein u1For switching frequency ac-excited source in the voltage at the both ends of concatenated first winding and the second winding, i1To open
Close frequency ac-excited source stream be concatenated after the first winding and the second winding electric current；
4) lower end of the first winding and the tertiary winding is in series, and switch frequency is accessed in the upper end of the first winding and the tertiary winding
The ac-excited source of rate；
5) magnetic bias driving source is accessed at the both ends of the second winding；
6) the loss P of the magnetic core column where the first winding and the tertiary winding is calculated13：
P13=∫ u2*i2dt (2)
Wherein u2For switching frequency ac-excited source in the voltage at the both ends of concatenated first winding and the tertiary winding, i2To open
Close frequency ac-excited source stream be concatenated after the first winding and the tertiary winding electric current；
7) lower end of the second winding and the tertiary winding is in series, and switch frequency is accessed in the upper end of the second winding and the tertiary winding
The ac-excited source of rate；
8) magnetic bias driving source is accessed at the both ends of the first winding；
9) the loss P of the magnetic core column where the second winding and the tertiary winding is calculated23：
P23=∫ u3*i3dt (3)
Wherein u3For switching frequency ac-excited source in the voltage at the both ends of concatenated second winding and the tertiary winding, i3To open
Close frequency ac-excited source stream be concatenated after the second winding and the tertiary winding electric current；
10) the total losses P of three-phase reactor is calculated：
P=(P12+P13+P23)/2 (4)
Wherein P12For the loss of the magnetic core column where the first winding and the second winding, P13For where the first winding and the tertiary winding
The loss of magnetic core column, P23For the loss of the magnetic core column where the second winding and the tertiary winding, P is the total losses of three-phase reactor；
11) by establishing the analysis model as the structure of the three-phase reactor in electromagnetic software, analysis obtains
The winding loss Pw of the three-phase reactor finally calculates total core loss Pc of three-phase reactor：
Pc=P-Pw (5)
Wherein P is the total losses of three-phase reactor, and Pw is the winding loss of three-phase reactor, and Pc is total magnetic core of three-phase reactor
Loss.
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| US8823370B2 (en) * | 2011-08-31 | 2014-09-02 | Virginia Tech Intellectual Properties, Inc. | High frequency loss measurement apparatus and methods for inductors and transformers |
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| CN103226187A (en) * | 2013-04-23 | 2013-07-31 | 福州大学 | Method for measuring loss of magnetic element |
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