CN106385033B - A kind of harmonic method and device of intermediate frequency furnace - Google Patents
A kind of harmonic method and device of intermediate frequency furnace Download PDFInfo
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- CN106385033B CN106385033B CN201610973421.1A CN201610973421A CN106385033B CN 106385033 B CN106385033 B CN 106385033B CN 201610973421 A CN201610973421 A CN 201610973421A CN 106385033 B CN106385033 B CN 106385033B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The present invention discloses the filtering method and device of a kind of intermediate frequency furnace, and the harmonic frequency of detection intermediate frequency furnace load simultaneously carries out analytical calculation and obtains filter reactance predicted value；The actual value of detection filter reactance；Filter reactance predicted value is compared with the filter reactance actual value detected, if the two is equal, keeps winding coil the number of turns of magnet controlled reactor constant, guarantees that filter inductance is constant；If the predicted value of filter reactance is greater than the actual value of filter reactance, by the coil sections short circuit in two winding coils of difference on iron core same in magnet controlled reactor, makes the magnet valve high-speed excitation in iron core, increase filter inductance；If the predicted value of filter reactance is less than the actual value of filter reactance, by the coil sections short circuit in same winding coil, so that the magnet valve in iron core is quickly demagnetized, reduce filter inductance；The size for adjusting filter inductance in real time by the m-Acetyl chlorophosphonazo frequency of detection intermediate frequency furnace load realizes that LC filter branch in different frequency point resonance, effectively administers the harmonic wave of intermediate frequency furnace.
Description
Technical field
The present invention relates to the technical fields of metallurgy industry power quality controlling, filter more particularly to a kind of harmonic wave of intermediate frequency furnace
Wave method and device.
Background technique
Intermediate frequency furnace has many advantages, such as that heating speed is fast, the thermal efficiency is high, homogeneous heating, environmental pollution are small, is widely used in gold
Belong to the industrial occasions such as melting, casting, heat treatment.Currently, it has become a kind of important technical equipment of metallurgy industry.But intermediate frequency
Furnace generates a large amount of harmonic wave when in use, causes the harmonic pollution in power grid very serious, therefore, it is necessary to carry out to intermediate frequency furnace
Harmonic wave control.The common methods of current intermediate frequency furnace harmonic wave control are LC filter branch in parallel, and this method will exactly smelt intermediate frequency
Furnace harmonic pollution is equivalent to characteristic frequency harmonic wave fixed caused by 6 pulsation or 12 pulsation rectifications, filters branch using LC in parallel
Road carries out harmonic wave control.Since intermediate frequency furnace generates a large amount of m-Acetyl chlorophosphonazo pollution, while the frequency of these m-Acetyl chlorophosphonazos is also as smelting
Continuous variation occurs for process, and traditional LC filter branch in parallel is poor to the harmonic wave control effect of intermediate frequency furnace.
Summary of the invention
In view of the above-mentioned problems, the present invention provides a kind of harmonic method of intermediate frequency furnace.
In order to achieve the above objectives, a kind of harmonic method of intermediate frequency furnace of the present invention, specifically comprise the following steps: step 1,
Filter is set in power line side, and filter sets 5,7,11,13 three filtering channels, magnetic force is installed in every filtering channel
Adjustable magnet controlled reactor；
Step 2, judge intermediate frequency furnace harmonic wave by etc. effect commutating pulse number, according to judging result selection incision it is corresponding
Filter；
Step 3, the harmonic frequency of detection intermediate frequency furnace load, carry out analytical calculation to the harmonic frequency detected, are filtered
Wave reactance predicted value；
Step 4, the actual value of detection filter reactance；
Filter reactance predicted value is compared by step 5 with the filter reactance actual value detected, according to the result of the comparison
Magnet controlled reactor in filtering channel is adjusted, detailed process is as follows:
If the predicted value of filter reactance is equal to the actual value of filter reactance, winding coil the number of turns of magnet controlled reactor is kept
It is constant, make to generate self coupling DC excitation electric current in coil, keeps filter inductance constant；
If the predicted value of filter reactance be greater than filter reactance actual value, by iron core same in magnet controlled reactor not
With the coil sections short circuit in two winding coils, makes the magnet valve high-speed excitation in iron core, increase filter inductance；
It is if the predicted value of filter reactance is less than the actual value of filter reactance, the coil sections in same winding coil are short
Road makes the magnet valve in iron core quickly demagnetize, and reduces filter inductance.
In order to achieve the above objectives, a kind of harmonic filtering installation of intermediate frequency furnace of the present invention, including filter, for detecting harmonic wave
Frequency detecting device and for controlling filter controller；
The filter includes the identical filter branch of star-like connection, includes magnetic control reactance in each filter branch
Device, the magnet controlled reactor are connected with anti-parallel thyristor；The magnet controlled reactor include the first iron core and the second iron core, first
It is wound with first coil and the second coil on iron core, tertiary coil and the 4th coil, first coil and are wound on the second iron core
Four coils are in series by the second connecting line by the first connecting line first branch in series, the second coil and tertiary coil
Second branch, the first branch is in parallel with second branch, and first connecting line is connect with the second connecting line by freewheeling diode；
First coil is provided with the first tapping point and the second tapping point, and third tapping point, second tap are provided on the second coil
Point is between the first and third tapping point；Tertiary coil is provided with the 4th tapping point, be provided on the 4th coil the 5th tapping point and
6th tapping point, the 5th tapping point is between the four, the six tapping points；Wherein, the second tapping point and third tapping point connect
It is connected to normal work circuit；Excitation circuit is connected between first tapping point and third tapping point, the first tapping point and second are taken out
Demagnetization circuit is connected between head point；4th tapping point and the 5th tapping point are connected with normal work circuit；4th tapping point and
It is connected with excitation circuit between 6th tapping point, is connected with demagnetization circuit between the 5th tapping point and the 6th tapping point.
The detection device is electrically connected with the controller, and the harmonic frequency signal that will test is exported to controller；
The controller is electrically connected with the normal work circuit, excitation circuit and demagnetization circuit, and control incision is normal
Operating circuit cuts out excitation circuit and demagnetization circuit；Or incision excitation circuit, cut out normal operating circuit and demagnetization circuit；Or it cuts
Enter demagnetization circuit, cuts out and work normally circuit and excitation circuit.
Preferably, the normal work circuit includes thyristor, self coupling DC excitation electric current is generated in coil for making；
The excitation circuit includes that IGBT and freewheeling diode increase and filter for making the magnet valve high-speed excitation in iron core
Inductance；
The demagnetization circuit includes IGBT and thyristor, for making the magnet valve in iron core quickly demagnetize, reduction filter inductance.
Preferably, in the normal work circuit, excitation circuit and demagnetization circuit: thyristor is connected with freewheeling diode,
IGBT connects with thyristor parallel connection, with freewheeling diode；The both ends reverse parallel connection of IGBT has diode；Wherein, thyristor and continuous
It flows Diode series and constitutes normal work circuit；IGBT and freewheeling diode excitation circuit in series；The both ends IGBT are reversely simultaneously
The diode and Thyristors in series of connection constitute demagnetization circuit.
Preferably, controller includes the first control strategy, the second control strategy and third control strategy, first control
The thyristor and diode that strategy is used to control work normally in circuit simultaneously turn on, and incision works normally circuit；Described second
The IGBT and diode that control strategy is used to control in excitation circuit are simultaneously turned on, and cut excitation circuit；The third controls plan
The thyristor and IGBT for being slightly used to control in demagnetization circuit simultaneously turn on, and cut demagnetization circuit.
Preferably, it is 0 that first tap and first coil, which connect the range of the turn ratio between the 4th overhang,
It is 0~3% that~10%, second tapping point and first coil, which connect the range of the turn ratio between the 4th overhang,；Third
The range of turn ratio between tapping point and the end of the second coil connection tertiary coil is 0~3%；4th tapping point and third
The range that coil connects the turn ratio between the second overhang is 0~3%；5th tap connect First Line with the 4th coil
The range of turn ratio between the end of circle is 0~3%, between the 6th tapping point and the end of the 4th coil connection first coil
The range of turn ratio be 0~10%.
Preferably, intermediate frequency furnace is rectified into six pulsation rectification, three-phase power line is connected with five times comprising 5 filter branch
Filter and include No. seven filters of 7 filter branch；
Or intermediate frequency furnace is rectified into 12 pulse rectification, that three-phase power line is connected with ten comprising 11 filter branch is primary
Filter and include 13 filter branch ten filter three times.Including be electrically connected with three-phase power line filter, detection device
And controller；
The present invention uses improved LC filter branch, and filter reactor is replaced using the magnet controlled reactor of high-speed excitation and demagnetization
For traditional filter reactor, the m-Acetyl chlorophosphonazo frequency of intermediate frequency furnace load is detected by detection device, and according to the m-Acetyl chlorophosphonazo of detection
Frequency controls the size of filter inductance L, realizes that LC filter branch in different frequency point resonance, effectively administers the humorous of intermediate frequency furnace
Wave, while realizing the continuously smooth adjusting and the quick response of filter reactance of filter reactance.
Detailed description of the invention
Fig. 1 is the harmonic method structure chart of intermediate frequency furnace of the present invention.
Fig. 2 is the iron core winding schematic diagram of filter reactance.
Fig. 3 is the direct current exciting current schematic diagram of filter reactance normal operation mode.
Fig. 4 is the direct current exciting current schematic diagram of filter reactance high-speed excitation working method.
Fig. 5 is that filter reactance is quickly demagnetized the direct current exciting current schematic diagram of working method.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings of the specification.
A kind of harmonic method of intermediate frequency furnace of the present invention includes the following steps: step 1, filtering is arranged in power line side
Device, and filter sets 5,7,11,13 three filtering channels, installs the adjustable magnet controlled reactor of magnetic force in every filtering channel；
Step 2, the number for judging intermediate frequency furnace commutating pulse, it is corresponding to filter according to judging result selection incision；
Step 3, the harmonic frequency of detection intermediate frequency furnace load, carry out analytical calculation to the harmonic frequency detected, are filtered
Wave reactance predicted value；
Step 4, the actual value of detection filter reactance；
Filter reactance predicted value is compared by step 5 with the filter reactance actual value detected, according to the result of the comparison
Magnet controlled reactor in filtering channel is adjusted, detailed process is as follows:
If the predicted value of filter reactance is equal to the actual value of filter reactance, winding coil the number of turns of magnet controlled reactor is kept
It is constant, make to generate self coupling DC excitation electric current in coil, keeps filter inductance constant；
If the predicted value of filter reactance be greater than filter reactance actual value, by iron core same in magnet controlled reactor not
With the coil sections short circuit in two winding coils, makes the magnet valve high-speed excitation in iron core, increase filter inductance；
It is if the predicted value of filter reactance is less than the actual value of filter reactance, the coil sections in same winding coil are short
Road makes the magnet valve in iron core quickly demagnetize, and reduces filter inductance.
As shown in Figure 1, the harmonic filtering installation structure chart of intermediate frequency furnace uses high-speed excitation using improved LC filter branch
Filter reactor is substituted with the magnet controlled reactor of demagnetization；Filter is filtered for detecting harmonic frequency detection device and for controlling
Wave device controller；
The filter includes the identical filter branch of star-like connection, includes magnetic control reactance in each filter branch
Device, the magnet controlled reactor are connected with anti-parallel thyristor；The magnet controlled reactor include the first iron core and the second iron core, first
It is wound with first coil and the second coil on iron core, tertiary coil and the 4th coil, first coil and are wound on the second iron core
Four coils are in series by the second connecting line by the first connecting line first branch in series, the second coil and tertiary coil
Second branch, the first branch is in parallel with second branch, and first connecting line is connect with the second connecting line by freewheeling diode；
First coil is provided with the first tapping point and the second tapping point, and third tapping point, second tap are provided on the second coil
Point is between the first and third tapping point；Tertiary coil is provided with the 4th tapping point, be provided on the 4th coil the 5th tapping point and
6th tapping point, the 5th tapping point is between the four, the six tapping points；Wherein, the second tapping point and third tapping point connect
It is connected to normal work circuit；Excitation circuit is connected between first tapping point and third tapping point, the first tapping point and second are taken out
Demagnetization circuit is connected between head point；4th tapping point and the 5th tapping point are connected with normal work circuit；4th tapping point and
It is connected with excitation circuit between 6th tapping point, is connected with demagnetization circuit between the 5th tapping point and the 6th tapping point.
The detection device is electrically connected with the controller, and the harmonic frequency signal that will test is exported to controller；
The controller is electrically connected with the normal work circuit, excitation circuit and demagnetization circuit, and control incision is normal
Operating circuit cuts out excitation circuit and demagnetization circuit；Or incision excitation circuit, cut out normal operating circuit and demagnetization circuit；Or it cuts
Enter demagnetization circuit, cuts out and work normally circuit and excitation circuit.
In the present embodiment, intermediate frequency furnace is rectified into 6 pulsation rectification, and intermediate frequency furnace harmonic treating apparatus is improved using 5 times and 7 times
LC filter circuit；Detection device detects the m-Acetyl chlorophosphonazo frequency of intermediate frequency furnace load, and will test signal and be conveyed to controller, controller
Improved LC filter circuit is controlled according to the m-Acetyl chlorophosphonazo frequency detected；
Combined with Figure 1 and Figure 2, by taking a filter branch as an example, including reactor body, comprising the in the reactor body
One iron core and the second iron core are wound with first coil L1 and the second coil L2 on the first iron core, are wound with third line on the second iron core
It encloses L3 and the 4th coil L4, first coil L1 and the 4th coil L4 and passes through the first connecting line first branch in series, the second line
L2 and tertiary coil L3 is enclosed by the second connecting line second branch in series, the first branch is in parallel with second branch, and described the
One connecting line is connect with the second connecting line by sustained diode 3；First coil L1 is provided with the first tapping point E1 and second and takes out
Head point E2, is provided with third tapping point E3 on the second coil, the second tapping point E2 is between the first and third tapping point；The
Three-winding L3 is provided with the 4th tapping point F1, and the 5th tapping point F2 and the 6th tapping point F3 is provided on the 4th coil L4, described
5th tapping point is between the four, the six tapping points；Wherein, the second tapping point and third tapping point are connected with normal work electricity
Road；It is connected with excitation circuit between first tapping point and third tapping point, is connected between the first tapping point and the second tapping point
Demagnetization circuit；4th tapping point and the 5th tapping point are connected with normal work circuit；Between 4th tapping point and the 6th tapping point
It is connected with excitation circuit, is connected with demagnetization circuit between the 5th tapping point and the 6th tapping point；
Wherein: the tapping point E1 of first coil L1 is connected with the collector of IGBT pipe T1, the emitter and crystalline substance of IGBT pipe T1
The cathode of brake tube K1 is connected with the anode of diode D1, and the anode of thyristor K1 is connected with the tapping point E2 of first coil L1, and two
The cathode of pole pipe D1 is connected with the tapping point E3 of the second coil L2, the collector of the tapping point F3 and IGBT pipe T2 of the 4th coil L4
It is connected, the emitter of IGBT pipe T2 is connected with the anode of the cathode of thyristor K2 and diode D2, the anode of thyristor K2 and the
The tapping point F2 of four coil L4 is connected, and the cathode of diode D2 is connected with the tapping point F1 of tertiary coil L3.The upper end of L1 winding
Point is connected with the upper extreme point of tertiary coil L3 and is connected to power supply, the upper extreme point phase of the lower extreme point of L1 winding and the 4th coil L4
Even, the lower extreme point of tertiary coil L3 is connected with the upper extreme point of the second coil L2, and the lower extreme point of first coil L1 is with diode D3's
Anode is connected, and the cathode of diode D3 is connected with the lower extreme point of tertiary coil L3, the lower extreme point and the 4th coil of the second coil L2
The lower extreme point of L4 is connected and is connected to power supply.
Wherein, thyristor K1 and diode D1 in series first works normally circuit, and thyristor K2 and diode D2 go here and there
Connection constitutes second and works normally circuit；IGBT pipe T1 and diode D1 the first excitation circuit in series, IGBT pipe T2 and two poles
Pipe D2 the second excitation circuit in series；IGBT pipe T1 and thyristor K1 the first demagnetization circuit in series, IGBT pipe T2 and crystalline substance
Brake tube K2 the second demagnetization circuit in series；
As shown in figure 3, in the present invention filter reactance normal operation mode direct current exciting current schematic diagram, controller
According to the actual value of reactance value and filter reactance required for sampled data analytical calculation filter reactance, required for filter reactance
Reactance value be equal to filter reactance actual value, controller run the first control strategy so that filter reactance is run on normal work side
Formula, under normal operation mode, controller issues trigger pulse, the triggering and conducting angle of thyristor is controlled, as shown in figure 3, being
Triggering and conducting thyristor K1 when voltage positive half cycle of uniting, DC current flow direction is E2 → K1 → D1 → E3, in system voltage negative half period
When triggering and conducting thyristor K2, DC current flow direction be F2 → K2 → D2 → F1.The filter reactance line of normal operation mode operation
Self coupling DC excitation electric current is generated in circle, and DC excitation electric current, control filter are adjusted by adjusting the size at turn on thyristors angle
Wave reactance exports size of current, realizes that the continuously smooth of filter reactance is adjusted.
As shown in figure 4, in the present invention filter reactance high-speed excitation working method direct current exciting current schematic diagram, control
The actual value of device processed reactance value and filter reactance according to required for sampled data analytical calculation filter reactance, when filter reactance institute
The reactance value needed is greater than the actual value of filter reactance, and controller, which runs the second control strategy, to be run on filter reactance quickly to encourage
Magnetic working method, under high-speed excitation working method, controller provides trigger pulse, passes through driving circuit triggering and conducting IGBT
Pipe, as shown in figure 4, T1 is connected in system voltage positive half cycle, DC current flow direction is E1 → T1 → D1 → E3, coil windings L1
It is short-circuited with the part L2, biggish positive Autotransformer DC voltage is generated in DC loop, DC current increases rapidly, makes in iron core
Magnet valve high-speed excitation, magnetic valve type controllable reactor output electric current increase rapidly；T2, direct current is connected in system voltage negative half period
Current direction is F3 → T2 → D2 → F1, and the part coil windings L3 and L4 is short-circuited, and it is straight that biggish positive self coupling is generated in circuit
Galvanic electricity pressure, DC current increase rapidly, and make the magnet valve high-speed excitation in iron core, and magnet controlled reactor output electric current increases rapidly.
As shown in figure 5, filter reactance is quickly demagnetized the direct current exciting current schematic diagram of working method in the present invention, control
The actual value of device processed reactance value and filter reactance according to required for sampled data analytical calculation filter reactance, when filter reactance institute
The reactance value needed is less than the actual value of filter reactance, and controller operation third control strategy runs on filter reactance quickly to move back
Magnetic working method, under quickly demagnetization working method, controller provides trigger pulse, passes through driving circuit triggering and conducting crystalline substance lock
Pipe, as shown in figure 5, K2 is connected in system voltage positive half cycle, DC current flow direction is F2 → K2 → T2 → F3, coil windings L4
Part is short-circuited, and biggish reversed Autotransformer DC voltage is generated in DC loop, is reduced rapidly the DC current in circuit, iron
Magnet valve in core quickly demagnetizes；K1 is connected in voltage negative half period, and DC current flow direction is E2 → K1 → T1 → E1, the portion coil windings L1
Divide and be short-circuited, biggish reversed Autotransformer DC voltage is generated in DC loop, is reduced rapidly the DC current in circuit, iron core
In magnet valve quickly demagnetize, magnet controlled reactor output electric current be reduced rapidly.
The present invention uses improved LC filter branch, and filter reactor is replaced using the magnet controlled reactor of high-speed excitation and demagnetization
For traditional filter reactor, the m-Acetyl chlorophosphonazo frequency of intermediate frequency furnace load is detected by detection device, and according to the m-Acetyl chlorophosphonazo of detection
Frequency controls the size of filter inductance L, realizes that LC filter branch in different frequency point resonance, effectively administers the humorous of intermediate frequency furnace
Wave, while realizing the continuously smooth adjusting and the quick response of filter reactance of filter reactance.
More than, only presently preferred embodiments of the present invention, but scope of protection of the present invention is not limited thereto, and it is any to be familiar with sheet
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by those skilled in the art, should all cover
Within protection scope of the present invention.Therefore, the scope of protection of the present invention shall be subject to the scope of protection defined by the claims.
Claims (4)
1. a kind of harmonic filtering installation of intermediate frequency furnace, it is characterised in that: the detection including filter, for detecting harmonic frequency fills
It sets and the controller for controlling filter；
The filter includes the identical filter branch of star-like connection, includes magnet controlled reactor, institute in each filter branch
Magnet controlled reactor is stated to connect with anti-parallel thyristor；The magnet controlled reactor includes the first iron core and the second iron core, the first iron core
On be wound with first coil and the second coil, tertiary coil and the 4th coil, first coil and the 4th coil are wound on the second iron core
By the first connecting line first branch in series, the second coil and tertiary coil pass through the second connecting line second in series
Road, the first branch is in parallel with second branch, and first connecting line is connect with the second connecting line by sustained diode 3；First
Coil is provided with the first tap and the second tap, and third tap is provided on the second coil, and second tap is located at first and third
Between tap；Tertiary coil is provided with the 4th tap, and the 5th tap and the 6th tap are provided on the 4th coil, and the described 5th takes out
Head is between the four, the six taps；Wherein, the first normal work circuit is connected between the second tap and third tap；First
It is connected with the first excitation circuit between tap and third tap, the first demagnetization electricity is connected between the first tap and the second tap
Road；The second normal work circuit is connected between 4th tap and the 5th tap；It is connected between 4th tap and the 6th tap
Second excitation circuit is connected with the second demagnetization circuit between the 5th tap and the 6th tap；
The detection device is electrically connected with the controller, and the harmonic frequency signal that will test is exported to controller；
The controller is electrically connected with the normal work circuit, excitation circuit and demagnetization circuit, and control incision works normally
Circuit cuts out excitation circuit and demagnetization circuit；Or incision excitation circuit, it cuts out and works normally circuit and demagnetization circuit；Or incision
Demagnetization circuit cuts out and works normally circuit and excitation circuit；
The normal work circuit includes thyristor, and self coupling DC excitation electric current is generated in coil for making；
The excitation circuit includes IGBT pipe and diode, for making the magnet valve high-speed excitation in iron core, increase filter inductance；
The demagnetization circuit is made of the diode of the IGBT pipe both ends reverse parallel connection with the Thyristors in series, is used for
So that the magnet valve in iron core is quickly demagnetized, reduces filter inductance；
In normal work circuit, excitation circuit and the demagnetization circuit: the thyristor and Diode series, it is described
IGBT manages and Diode series in parallel with thyristor；The both ends reverse parallel connection of the IGBT pipe has diode；Wherein, described
Thyristor and Diode series constitute work normally circuit；The IGBT pipe and Diode series constitute excitation circuit；Institute
The diode for the IGBT pipe both ends reverse parallel connection stated and the Thyristors in series constitute demagnetization circuit；
Wherein, the normal work circuit includes that the first normal work circuit and second work normally circuit, thyristor Kl
Circuit is worked normally with diode Dl in series first, thyristor K2 and diode D2 in series second are worked normally
Circuit；Excitation circuit includes the first excitation circuit and the second excitation circuit, IGBT pipe Tl and diode Dl in series first
Excitation circuit, IGBT pipe T2 and diode D2 the second excitation circuit in series；Demagnetization circuit include the first demagnetization circuit and
Second demagnetization circuit, the diode and thyristor Kl the first demagnetization circuit in series of the both ends IGBT pipe Tl reverse parallel connection,
The diode and thyristor K2 the second demagnetization circuit in series of the both ends IGBT pipe T2 reverse parallel connection.
2. the harmonic filtering installation of intermediate frequency furnace according to claim 1, it is characterised in that: the control strategy of controller includes
First control strategy, the second control strategy and third control strategy, first control strategy work normally circuit for controlling
In thyristor and diode simultaneously turn on, incision work normally circuit；Second control strategy is for controlling excitation circuit
In IGBT pipe and diode simultaneously turn on, cut excitation circuit；The third control strategy is for controlling in demagnetization circuit
The diode of thyristor and IGBT pipe both ends reverse parallel connection simultaneously turns on, and cuts demagnetization circuit；
Wherein, the first control strategy is used for the control first in system voltage positive half cycle and works normally circuit conducting or in system
Control second works normally circuit conducting when voltage negative half period, and the first normal work circuit of incision or second work normally circuit；
Second control strategy is for controlling the conducting of the first excitation circuit in system voltage positive half cycle or in system voltage negative half period
The conducting of the second excitation circuit is controlled, the first excitation circuit or the second excitation circuit are cut；Third control strategy is used in system electricity
The conducting of the first demagnetization circuit is controlled when positive pressure half cycle or the conducting of the second demagnetization circuit, incision are controlled in system voltage negative half period
First demagnetization circuit or the second demagnetization circuit.
3. a kind of harmonic filtering installation of intermediate frequency furnace according to claim 1, it is characterised in that:
The range of the turn ratio of coil and first coil between first tap and the 4th overhang is 0~10%,
The range of the turn ratio of coil and first coil between second tap and the 4th overhang is 0~3%；Third tap with
The range of the turn ratio of coil and the second coil between the end of tertiary coil is 0~3%；4th tap and the second coil
The range of the turn ratio of coil and tertiary coil between end is 0~3%；Between 5th tap and the end of first coil
The range of the turn ratio of coil and the 4th coil is 0~3%；Coil and the 4th between 6th tap and the end of first coil
The range of the turn ratio of coil is 0~10%.
4. a kind of harmonic method of the harmonic filtering installation of intermediate frequency furnace as claimed in any one of claims 1-3, special
Sign is: including the following steps:
Filter is arranged in three phase mains line side in step 1, and filter sets 5,7,11,13 three filtering channels, filters at every
Wave channel is installed by the adjustable magnet controlled reactor of magnetic force；
Step 2 judges intermediate frequency furnace commutating pulse number, cuts corresponding filter according to judging result selection；
Step 3, the harmonic frequency of detection intermediate frequency furnace load, carry out analytical calculation to the harmonic frequency detected, obtain filtered electrical
Anti- predicted value；
Step 4, the actual value of detection filter reactance；
Filter reactance predicted value is compared by step 5 with the filter reactance actual value detected, is adjusted according to the result of the comparison
Magnet controlled reactor in filtering channel, detailed process is as follows:
If the predicted value of filter reactance is equal to the actual value of filter reactance, keeps the coil turn of magnet controlled reactor constant, make
Self coupling DC excitation electric current is generated in coil, keeps filter inductance constant；
If the predicted value of filter reactance is greater than the actual value of filter reactance, by the difference two on iron core same in magnet controlled reactor
Coil sections short circuit in a coil, makes the magnet valve high-speed excitation in iron core, increases filter inductance；
If the predicted value of filter reactance is less than the actual value of filter reactance, by the coil sections short circuit in same coil, make iron
Magnet valve in core quickly demagnetizes, and reduces filter inductance.
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| CN201610973421.1A CN106385033B (en) | 2016-11-04 | 2016-11-04 | A kind of harmonic method and device of intermediate frequency furnace |
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| CN201610973421.1A CN106385033B (en) | 2016-11-04 | 2016-11-04 | A kind of harmonic method and device of intermediate frequency furnace |
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| CN106385033B true CN106385033B (en) | 2019-01-25 |
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