CN108711829A - A kind of DC magnetic biasing suppression device and method with duplicate protection - Google Patents
A kind of DC magnetic biasing suppression device and method with duplicate protection Download PDFInfo
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- CN108711829A CN108711829A CN201810834519.8A CN201810834519A CN108711829A CN 108711829 A CN108711829 A CN 108711829A CN 201810834519 A CN201810834519 A CN 201810834519A CN 108711829 A CN108711829 A CN 108711829A
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- 230000001629 suppression Effects 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000007935 neutral effect Effects 0.000 claims abstract description 52
- 239000003990 capacitor Substances 0.000 claims abstract description 34
- 230000000903 blocking effect Effects 0.000 claims abstract description 32
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 26
- 230000001681 protective effect Effects 0.000 claims abstract description 19
- 229960001296 zinc oxide Drugs 0.000 claims abstract description 13
- 239000011787 zinc oxide Substances 0.000 claims abstract description 13
- 238000013024 troubleshooting Methods 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims abstract 3
- 230000003750 conditioning effect Effects 0.000 claims description 19
- 230000002441 reversible effect Effects 0.000 claims description 15
- 239000004020 conductor Substances 0.000 claims description 12
- 238000004804 winding Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 2
- 239000013078 crystal Substances 0.000 claims 1
- 230000000875 corresponding effect Effects 0.000 abstract 3
- 230000005540 biological transmission Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000005404 monopole Effects 0.000 description 2
- 208000032368 Device malfunction Diseases 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 208000025274 Lightning injury Diseases 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/16—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for capacitors
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Power Conversion In General (AREA)
- Inverter Devices (AREA)
Abstract
The invention belongs to the D.C. magnetic biasing technical protection fields of transformer, and in particular to a kind of DC magnetic biasing suppression device and method with duplicate protection.Described device includes：Transformer neutral earthing switch K1, stopping direct current switch K2, blocking capacitor C, portable protective gaps circuit, transistor protection circuit, Zinc-Oxide Arrester R, bypass protection switch K3, the first Current Transmit1, the second Current Transmit2, signal condition unit, control unit and driving unit.The method includes：1) DC component detection is carried out；2) DC component detected is compared with threshold value, makes corresponding actions；3) alternating current detection is carried out；4) alternating current detected is compared with threshold value, makes corresponding actions；4) judge that can various actions be normally carried out, make corresponding actions；5) after AC network trouble shooting, system playback, return to step 1.
Description
Technical field
The invention belongs to the D.C. magnetic biasing technical protection fields of transformer, and in particular to a kind of direct current with duplicate protection
Magnetic bias restraining device and method.
Background technology
D.C. high voltage transmission has better economy in remote, large capacity electric energy electricity transmission process.For long distance
It from DC transmission system, typically runs, but at system Construction initial stage or ought wherein break down a pole in a bipolar fashion
When, the method for operation becomes monopole the earth and runs.
From the foregoing, it will be observed that a kind of method of operation of the monopole the earth operation as HVDC transmission system, in actual operation
Substantially inevitably.The DC current of up to several kiloamperes is directly injected into the earth from direct current grounding pole can pass through transformation
The grounded neutral of device enters AC network, causes to increase DC component in the exciting current of transformer.The DC component meeting
The iron core height of transformer is caused to be saturated, thus initiation transformer vibration aggravation, hot-spot, noise increase, generation are a large amount of humorous
Wave causes the increase of transformer reactive loss, insulation damages, the lost of life and leads to protective relaying device malfunction, seriously affects
The stable operation of electric system.
D.C. magnetic biasing problem caused by the electric current flowed into due to neutral point in order to avoid grounding transformer, people are to inhibiting to become
The measure of depressor neutral point direct current and the research of device are more and more.Neutral point series-capacitor is to inhibit to become at present
Popular scheme in terms of depressor neutral point direct current, traditional scheme when lightning stroke or AC system short trouble,
The transformer neutral conductor can flow through prodigious electric current, and generate very high transient voltage, may be damaged to capacitor.Therefore
It needs reliably to protect blocking capacitor.
Invention content
For the above technical problems, the present invention provides a kind of DC magnetic biasing suppression device with duplicate protection,
It is characterised in that it includes：Transformer neutral earthing switch K1, stopping direct current switch K2, blocking capacitor C, portable protective gaps return
Road, transistor protection circuit, Zinc-Oxide Arrester R, bypass protection switch K3, the first Current Transmit1, the second Current Mutual Inductance
Device CT2, signal condition unit, control unit and driving unit；
Transformer neutral earthing switch K1Input terminal and the neutral point of transformer winding connect, the transformer neutral conductor connects
Ground switch K1Output end and Current Transmit1Series connection ground connection；
Stopping direct current switch K2Input terminal and transformer winding the neutral conductor connect, stopping direct current switch K2Output end difference
With Current Transmit2, voltage transformer pt one end connection；
Current Transmit2The other end connect with one end of blocking capacitor C；
The other end of blocking capacitor C and transformer neutral earthing switch K1Output end connection；
Voltage transformer pt and transformer neutral earthing switch K1Output end connection；
Portable protective gaps circuit is by the first current-limiting inductance L1It is composed in series with spark gap M；
The first current-limiting inductance L in portable protective gaps circuit1One end and stopping direct current switch K2Output end connection, portable protective gaps
The first current-limiting inductance L in circuit1The other end connect with one end of spark gap M, the other end and transformer of spark gap M
Neutral earthing switch K1Output end connection；
One end of Zinc-Oxide Arrester R and stopping direct current switch K2Output end connection, the other end of Zinc-Oxide Arrester R with
Transformer neutral earthing switch K1Output end connection；
Bypass protection switch K3Input terminal and stopping direct current switch K2Output end connection, bypass protection switch K3Output
End and transformer neutral earthing switch K1Output end connection；
Transistor protection circuit is by the second current-limiting inductance L2With the first insulated gate transistor VT of reverse parallel connection1, second absolutely
Edge gate type transistor VT2It is composed in series；
The second current-limiting inductance L in transistor protection circuit2One end and stopping direct current switch K2Output end connection, transistor
Second current-limiting inductance L of protective loop2The other end and reverse parallel connection the first insulated gate transistor VT1, the second insulated gate
Transistor npn npn VT2One end connection, the first insulated gate transistor VT of reverse parallel connection1, the second insulated gate transistor VT2's
The other end and transformer neutral earthing switch K1Output end connection；
First Current Transmit1It is connect with the first input end IN1 of signal condition unit, the second input terminal IN2, second
Current Transmit2It is connect with third input terminal IN3, the 4th input terminal IN4 of signal condition unit；
The output end of signal condition unit and the input terminal of control unit connect, for acquiring and handling CT1And CT2Inspection
Signal is surveyed, control unit is then passed to；
The output end of control unit is connect with driving unit, is controlled for being generated according to the input signal of signal condition unit
Instruction, and it is sent to driving unit；
Driving unit respectively with the first insulated gate transistor VT1, the second insulated gate transistor VT2Connection, for control
The control instruction of unit processed carries out boost operations, then passes to the first insulated gate transistor VT1, the second insulated-gate type it is brilliant
Body pipe VT2, to realize to the first insulated gate transistor VT1, the second insulated gate transistor VT2It is effective conducting and cut
Only.
The signal condition unit, including：First operational amplifier U1, second operational amplifier U2, third operation amplifier
Device U3, four-operational amplifier U4, first resistor R1, second resistance R2, 3rd resistor R3, the 4th resistance R4, the 5th resistance R5、
6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, eleventh resistor R11, the 12nd electricity
Hinder R12, thirteenth resistor R13, the 14th resistance R14, the 15th resistance R15, the 16th resistance R16, the first capacitance C1；
The first resistor R1One end connection signal conditioning unit the second input terminal IN2, first resistor R1The other end
It is separately connected second resistance R2, 3rd resistor R3One end, and be connected to the positive input terminal of the first operational amplifier U1；
The second resistance R2Other end connection signal conditioning unit the second input terminal IN2；
3rd resistor R3The other end ground connection；
4th resistance R4One end be separately connected the negative input end of the first operational amplifier U1, the 5th resistance R5One end,
Four resistance R4The other end ground connection；
5th resistance R5The other end be separately connected the output end of the first operational amplifier U1, the 6th resistance R6One end；
6th resistance R6The other end be separately connected the positive input terminal of second operational amplifier U2, the 7th resistance R7One end；
7th resistance R7The other end ground connection；
The negative input end of second operational amplifier U2 is separately connected the 8th resistance R8, the 9th resistance R9One end；
8th resistance R8The other end ground connection；
9th resistance R9The other end be separately connected the output end of second operational amplifier U2, signal conditioning circuit first
Output end OUT1；
Tenth resistance R10One end be separately connected third input terminal IN3, the eleventh resistor R of third operational amplifier U311
One end, the tenth resistance R10Other end connection third operational amplifier U3 the 4th input terminal IN4, and be grounded；
Eleventh resistor R11The other end be separately connected the negative input end of third operational amplifier U3, twelfth resistor R12
One end；
The positive input terminal connection thirteenth resistor R of third operational amplifier U313, the 14th resistance R14One end；
Twelfth resistor R12The other end be separately connected the output end of third operational amplifier U3, the 15th resistance R15's
One end；
Thirteenth resistor R13The other end ground connection；
14th resistance R14The other end be separately connected the 4th pin, the four-operational amplifier of third operational amplifier U3
The 4th pin of U4；
15th resistance R15The other end be separately connected the first capacitance C1One end, four-operational amplifier U4 positive input
End,
First capacitance C1The other end ground connection；
The negative input end of four-operational amplifier U4 is separately connected the output end of four-operational amplifier U4, the 16th resistance
R16One end；
16th resistance R16Other end connection signal conditioning unit second output terminal OUT2.
Described control unit uses the dsp processor of TMS320F2812 models；
First output end OUT1 of the ADCINA0 pin connection signal conditioning units of TMS320F2812 processors,
The second output terminal OUT2 of the ADCINB0 pin connection signal conditioning units of TMS320F2812 processors,
PWM1~PWM2 output pins of TMS320F2812 processors are sequentially connected SPWM1~SPWM2 of driving unit
Pin.
The driving unit uses DA926D7 driving circuits；
The GND pin of driving circuit is grounded；
+ 15V the pins of the VCC pin connection DC power supplier of driving circuit；
The pins of the SPWM1 of driving circuit~2 are sequentially connected the pins of PWM1~2 of dsp processor；
The pins of the Output1 of driving circuit~2 are connected to the first insulated gate transistor VT in turn1Base stage G1 and second
Insulated gate transistor VT2On~G2.
A kind of control method of the DC magnetic biasing suppression device with duplicate protection, using above-mentioned with duplicate protection
DC magnetic biasing suppression device includes the following steps：
Step 1：Pass through the first Current Transmit1DC component in transformer neutral current is detected；
Step 2：Pass through the first Current Transmit1The DC component detected is compared with the direct current threshold value of setting；
If the first Current Transmit1The DC component detected is less than the direct current threshold value of setting, and the transformer neutral conductor connects
Ground switch K1It is closed stopping direct current switch K simultaneously2It disconnects, blocking capacitor C is detached from circuit, return to step 1；
If the first Current Transmit1The DC component detected is more than the direct current threshold value of setting, and the transformer neutral conductor connects
Ground switch K1Disconnect stopping direct current switch K simultaneously2It is closed, blocking capacitor C puts into operation；
Step 3：Pass through the second Current Transmit2Alternating current to flowing through blocking capacitor C is detected；
Step 4：By the second Current Transmit2The alternating current for flowing through blocking capacitor C detected and setting
Alternating current threshold value is compared,
If the second Current Transmit2Minimum Threshold of the alternating current for flowing through blocking capacitor C detected in setting
Between value and max-thresholds, then the first insulated gate transistor VT of reverse parallel connection is driven1With the second insulated gate transistor VT2
Conducting, enters step 6；Otherwise, 5 are entered step；
Step 5：If the second Current Transmit2The alternating current for flowing through blocking capacitor C detected is more than setting
Alternating current max-thresholds, bypass protection switch K3It is closed, while the first insulated gate transistor VT of reverse parallel connection1With
Two insulated gate transistor VT2Shutdown, enters step 7；Otherwise, return to step 3；
Step 6：If the various actions involved in step 4 or step 5 cannot be normally carried out, 7 are entered step；Otherwise, into
Enter step 8；
Step 7：It puts into operation with Zinc-Oxide Arrester R in portable protective gaps circuit；
Step 8：After AC network trouble shooting, transformer neutral earthing switch K1It is first closed, then stopping direct current switch K2
With bypass protection switch K3It disconnects, return to step 1.
Beneficial effects of the present invention：
The present invention proposes a kind of DC magnetic biasing suppression device and method with duplicate protection, can be inclined to transformer dc
Magnetic is inhibited, and reliability is high, at low cost, it is ensured that the stable operation of power grid.Since asymmetry short circuit fault occurs for AC network
When, the alternating current increased time in the transformer neutral conductor is short, and amplitude is big, is easily damaged to DC magnetic biasing suppression device.
Compared with traditional technology, back-up protection of the selective oxidation zinc arrester of the present invention as blocking capacitor is made with spark gap
For the back-up protection of arrester, achieve the purpose that, to blocking capacitor duplicate protection, to overcome transistor protection circuit and side
Road protection switch can not act and lose the drawbacks of being protected to blocking capacitor, effectively increase DC magnetic biasing suppression device
Reliability.
Reasonable design of the present invention, it is easy to accomplish, there is good practical value.
Description of the drawings
Fig. 1 is the topological structure of the DC magnetic biasing suppression device with duplicate protection described in the specific embodiment of the invention
Figure；
Fig. 2 is the schematic diagram of signal conditioning circuit described in the specific embodiment of the invention；
Fig. 3 is the connection diagram of control unit and driving unit described in the specific embodiment of the invention；
Fig. 4 is the schematic diagram of driving unit described in the specific embodiment of the invention；
Fig. 5 is the inhibition side of the DC magnetic biasing suppression device with duplicate protection described in the specific embodiment of the invention
Method flow chart.
In figure：1, signal condition unit；2, control unit；3, driving unit.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with attached drawing and embodiment,
Further description is made to the present invention.It should be appreciated that specific embodiment described herein is only used to explain this hair
It is bright, it is not intended to limit the present invention.
The present invention proposes a kind of DC magnetic biasing suppression device with duplicate protection, as shown in Figure 1, including：In transformer
Property line earthing switch K1, stopping direct current switch K2, blocking capacitor C, portable protective gaps circuit, transistor protection circuit, zinc oxide
Arrester R, bypass protection switch K3, the first Current Transmit1, the second Current Transmit2, signal condition unit 1, control
Unit 2 and driving unit 3 processed；
Transformer neutral earthing switch K1Input terminal and the neutral point of transformer winding connect, the transformer neutral conductor connects
Ground switch K1Output end and Current Transmit1Series connection ground connection；
Stopping direct current switch K2Input terminal and transformer winding the neutral conductor connect, stopping direct current switch K2Output end difference
With Current Transmit2, voltage transformer pt one end connection；
Current Transmit2The other end connect with one end of blocking capacitor C；
The other end of blocking capacitor C and transformer neutral earthing switch K1Output end connection；
Voltage transformer pt and transformer neutral earthing switch K1Output end connection；
Portable protective gaps circuit is by the first current-limiting inductance L1It is composed in series with spark gap M；
The first current-limiting inductance L in portable protective gaps circuit1One end and stopping direct current switch K2Output end connection, portable protective gaps
The first current-limiting inductance L in circuit1The other end connect with one end of spark gap M, the other end and transformer of spark gap M
Neutral earthing switch K1Output end connection；
One end of Zinc-Oxide Arrester R and stopping direct current switch K2Output end connection, the other end of Zinc-Oxide Arrester R with
Transformer neutral earthing switch K1Output end connection；
Bypass protection switch K3Input terminal and stopping direct current switch K2Output end connection, bypass protection switch K3Output
End and transformer neutral earthing switch K1Output end connection；
Transistor protection circuit is by the second current-limiting inductance L2With the first insulated gate transistor VT of reverse parallel connection1, second absolutely
Edge gate type transistor VT2It is composed in series；
The second current-limiting inductance L in transistor protection circuit2One end and stopping direct current switch K2Output end connection, transistor
Second current-limiting inductance L of protective loop2The other end and reverse parallel connection the first insulated gate transistor VT1, the second insulated gate
Transistor npn npn VT2One end connection, the first insulated gate transistor VT of reverse parallel connection1, the second insulated gate transistor VT2's
The other end and transformer neutral earthing switch K1Output end connection；
First Current Transmit1It is connect with the first input end IN1 of signal condition unit 1, the second input terminal IN2, the
Two Current Transmits2It is connect with third input terminal IN3, the 4th input terminal IN4 of signal condition unit 1；
The output end of signal condition unit 1 is connect with the input terminal of control unit 2, for acquiring and handling CT1And CT2's
Signal is detected, control unit 2 is then passed to；
The output end of control unit 2 is connect with driving unit 3, for being generated according to the input signal of signal condition unit 1
Control instruction, and it is sent to driving unit 3；
Driving unit 3 respectively with the first insulated gate transistor VT1, the second insulated gate transistor VT2Connection, for pair
The control instruction of control unit 2 carries out boost operations, then passes to the first insulated gate transistor VT1, the second insulated-gate type
Transistor VT2, to realize to the first insulated gate transistor VT1, the second insulated gate transistor VT2It is effective conducting and cut
Only；
Signal condition unit 1, as shown in Fig. 2, including：First operational amplifier U1, second operational amplifier U2, third
Operational amplifier U3, four-operational amplifier U4, first resistor R1, second resistance R2, 3rd resistor R3, the 4th resistance R4,
Five resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, eleventh resistor R11、
Twelfth resistor R12, thirteenth resistor R13, the 14th resistance R14, the 15th resistance R15, the 16th resistance R16, the first capacitance
C1；
The first resistor R1One end connection signal conditioning unit 1 the second input terminal IN2, first resistor R1It is another
End is separately connected second resistance R2, 3rd resistor R3One end, and be connected to the positive input terminal of the first operational amplifier U1；
The second resistance R2Other end connection signal conditioning unit 1 the second input terminal IN2；
3rd resistor R3The other end ground connection；
4th resistance R4One end be separately connected the negative input end of the first operational amplifier U1, the 5th resistance R5One end,
Four resistance R4The other end ground connection；
5th resistance R5The other end be separately connected the output end of the first operational amplifier U1, the 6th resistance R6One end；
6th resistance R6The other end be separately connected the positive input terminal of second operational amplifier U2, the 7th resistance R7One end；
7th resistance R7The other end ground connection；
The negative input end of second operational amplifier U2 is separately connected the 8th resistance R8, the 9th resistance R9One end；
8th resistance R8The other end ground connection；
9th resistance R9The other end be separately connected the output end of second operational amplifier U2, signal conditioning circuit first
Output end OUT1；
Tenth resistance R10One end be separately connected third input terminal IN3, the eleventh resistor R of third operational amplifier U311
One end, the tenth resistance R10Other end connection third operational amplifier U3 the 4th input terminal IN4, and be grounded；
Eleventh resistor R11The other end be separately connected the negative input end of third operational amplifier U3, twelfth resistor R12
One end；
The positive input terminal connection thirteenth resistor R of third operational amplifier U313, the 14th resistance R14One end；
Twelfth resistor R12The other end be separately connected the output end of third operational amplifier U3, the 15th resistance R15's
One end；
Thirteenth resistor R13The other end ground connection；
14th resistance R14The other end be separately connected the 4th pin, the four-operational amplifier of third operational amplifier U3
The 4th pin of U4；
15th resistance R15The other end be separately connected the first capacitance C1One end, four-operational amplifier U4 positive input
End,
First capacitance C1The other end ground connection；
The negative input end of four-operational amplifier U4 is separately connected the output end of four-operational amplifier U4, the 16th resistance
R16One end；
16th resistance R16Other end connection signal conditioning unit 1 second output terminal OUT2；
Control unit 2 uses the dsp processor of TMS320F2812 models, as shown in Figure 3；
First output end OUT1 of the ADCINA0 pin connection signals conditioning unit 1 of TMS320F2812 processors；
The second output terminal OUT2 of the ADCINB0 pin connection signals conditioning unit 1 of TMS320F2812 processors；
PWM1~PWM2 output pins of TMS320F2812 processors are sequentially connected SPWM1~SPWM2 of driving unit 3
Pin.
Driving unit 3 uses DA926D7 driving circuits, as shown in figure 4, present embodiment uses six unit IGBT driving boards
DA962D7；
The GND pin of driving circuit is grounded,
+ 15V the pins of the VCC pin connection DC power supplier of driving circuit,
The pins of the SPWM1 of driving circuit~2 are sequentially connected the pins of PWM1~2 of dsp processor,
The pins of the Output1 of driving circuit~2 are connected to the first insulated gate transistor VT in turn1Base stage G1 and second
Insulated gate transistor VT2On~G2, good rise and fall can be obtained along wave, realize the driving of insulated gate transistor.
The present invention proposes a kind of control method of the DC magnetic biasing suppression device with duplicate protection, as shown in figure 5, using
The above-mentioned DC magnetic biasing suppression device with duplicate protection, includes the following steps：
Step 1：Pass through the first Current Transmit1DC component in transformer neutral current is detected；
Step 2：Pass through the first Current Transmit1The DC component detected is compared with the direct current threshold value of setting；
If the first Current Transmit1The DC component detected is less than the direct current threshold value of setting, and the transformer neutral conductor connects
Ground switch K1It is closed stopping direct current switch K simultaneously2It disconnects, blocking capacitor C is detached from circuit, return to step 1；
If the first Current Transmit1The DC component detected is more than the direct current threshold value of setting, and the transformer neutral conductor connects
Ground switch K1Disconnect stopping direct current switch K simultaneously2It is closed, blocking capacitor C puts into operation；
Step 3：Pass through the second Current Transmit2Alternating current to flowing through blocking capacitor C is detected；
Step 4：By the second Current Transmit2The alternating current for flowing through blocking capacitor C detected and setting
Alternating current threshold value is compared,
If the second Current Transmit2Minimum Threshold of the alternating current for flowing through blocking capacitor C detected in setting
Between value and max-thresholds, then the first insulated gate transistor VT of reverse parallel connection is driven1With the second insulated gate transistor VT2
Conducting, enters step 6；Otherwise, 5 are entered step；
Step 5：If the second Current Transmit2The alternating current for flowing through blocking capacitor C detected is more than setting
Alternating current max-thresholds, bypass protection switch K3It is closed, while the first insulated gate transistor VT of reverse parallel connection1With
Two insulated gate transistor VT2Shutdown, enters step 7；Otherwise, return to step 3；
Step 6：If the various actions involved in step 4 or step 5 cannot be normally carried out, 7 are entered step；Otherwise, into
Enter step 8；
Step 7：It puts into operation with Zinc-Oxide Arrester R in portable protective gaps circuit；
Step 8：After AC network trouble shooting, transformer neutral earthing switch K1It is first closed, then stopping direct current switch K2
With bypass protection switch K3It disconnects, return to step 1.
Claims (5)
1. a kind of DC magnetic biasing suppression device with duplicate protection, which is characterized in that including：Transformer neutral earthing switchs
K1, stopping direct current switch K2, blocking capacitor C, portable protective gaps circuit, transistor protection circuit, Zinc-Oxide Arrester R, bypass protect
Protect switch K3, the first Current Transmit1, the second Current Transmit2, signal condition unit, control unit and driving unit；
Transformer neutral earthing switch K1Input terminal and the neutral point of transformer winding connect, transformer neutral earthing opens
Close K1Output end and Current Transmit1Series connection ground connection；
Stopping direct current switch K2Input terminal and transformer winding the neutral conductor connect, stopping direct current switch K2Output end respectively with electricity
Current transformer CT2, voltage transformer pt one end connection；
Current Transmit2The other end connect with one end of blocking capacitor C；
The other end of blocking capacitor C and transformer neutral earthing switch K1Output end connection；
Voltage transformer pt and transformer neutral earthing switch K1Output end connection；
Portable protective gaps circuit is by the first current-limiting inductance L1It is composed in series with spark gap M；
The first current-limiting inductance L in portable protective gaps circuit1One end and stopping direct current switch K2Output end connection, portable protective gaps circuit
The first current-limiting inductance L1The other end connect with one end of spark gap M, the other end of spark gap M and the transformer neutral conductor
Earthing switch K1Output end connection；
One end of Zinc-Oxide Arrester R and stopping direct current switch K2Output end connection, the other end and transformation of Zinc-Oxide Arrester R
Device neutral earthing switch K1Output end connection；
Bypass protection switch K3Input terminal and stopping direct current switch K2Output end connection, bypass protection switch K3Output end with
Transformer neutral earthing switch K1Output end connection；
Transistor protection circuit is by the second current-limiting inductance L2With the first insulated gate transistor VT of reverse parallel connection1, the second insulated gate
Transistor npn npn VT2It is composed in series；
The second current-limiting inductance L in transistor protection circuit2One end and stopping direct current switch K2Output end connection, transistor protection
The second current-limiting inductance L in circuit2The other end and reverse parallel connection the first insulated gate transistor VT1, the second insulated-gate type crystal
Pipe VT2One end connection, the first insulated gate transistor VT of reverse parallel connection1, the second insulated gate transistor VT2The other end
With transformer neutral earthing switch K1Output end connection；
First Current Transmit1It is connect with the first input end IN1 of signal condition unit, the second input terminal IN2, the second electric current
Mutual inductor CT2It is connect with third input terminal IN3, the 4th input terminal IN4 of signal condition unit；
The output end of signal condition unit and the input terminal of control unit connect, for acquiring and handling CT1And CT2Detection letter
Number, then pass to control unit；
The output end of control unit is connect with driving unit, is referred to for generating control according to the input signal of signal condition unit
It enables, and is sent to driving unit；
Driving unit respectively with the first insulated gate transistor VT1, the second insulated gate transistor VT2Connection, for single to control
The control instruction of member carries out boost operations, then passes to the first insulated gate transistor VT1, the second insulated gate transistor
VT2, to realize to the first insulated gate transistor VT1, the second insulated gate transistor VT2Effective on and off.
2. the DC magnetic biasing suppression device according to claim 1 with duplicate protection, which is characterized in that the signal tune
Unit is managed, including：First operational amplifier U1, second operational amplifier U2, third operational amplifier U3, four-operational amplifier
U4, first resistor R1, second resistance R2, 3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance
R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, eleventh resistor R11, twelfth resistor R12, thirteenth resistor R13,
14 resistance R14, the 15th resistance R15, the 16th resistance R16, the first capacitance C1；
The first resistor R1One end connection signal conditioning unit the second input terminal IN2, first resistor R1The other end difference
Connect second resistance R2, 3rd resistor R3One end, and be connected to the positive input terminal of the first operational amplifier U1；
The second resistance R2Other end connection signal conditioning unit the second input terminal IN2；
3rd resistor R3The other end ground connection；
4th resistance R4One end be separately connected the negative input end of the first operational amplifier U1, the 5th resistance R5One end, the 4th electricity
Hinder R4The other end ground connection；
5th resistance R5The other end be separately connected the output end of the first operational amplifier U1, the 6th resistance R6One end；
6th resistance R6The other end be separately connected the positive input terminal of second operational amplifier U2, the 7th resistance R7One end；
7th resistance R7The other end ground connection；
The negative input end of second operational amplifier U2 is separately connected the 8th resistance R8, the 9th resistance R9One end；
8th resistance R8The other end ground connection；
9th resistance R9The other end be separately connected the output end of second operational amplifier U2, signal conditioning circuit first output
Hold OUT1；
Tenth resistance R10One end be separately connected third input terminal IN3, the eleventh resistor R of third operational amplifier U311One
End, the tenth resistance R10Other end connection third operational amplifier U3 the 4th input terminal IN4, and be grounded；
Eleventh resistor R11The other end be separately connected the negative input end of third operational amplifier U3, twelfth resistor R12One
End；
The positive input terminal connection thirteenth resistor R of third operational amplifier U313, the 14th resistance R14One end；
Twelfth resistor R12The other end be separately connected the output end of third operational amplifier U3, the 15th resistance R15One end；
Thirteenth resistor R13The other end ground connection；
14th resistance R14The other end be separately connected the 4th pin of third operational amplifier U3, four-operational amplifier U4
4th pin；
15th resistance R15The other end be separately connected the first capacitance C1One end, four-operational amplifier U4 positive input terminal,
First capacitance C1The other end ground connection；
The negative input end of four-operational amplifier U4 is separately connected the output end of four-operational amplifier U4, the 16th resistance R16's
One end；
16th resistance R16Other end connection signal conditioning unit second output terminal OUT2.
3. the DC magnetic biasing suppression device according to claim 1 with duplicate protection, which is characterized in that the control is single
Member uses the dsp processor of TMS320F2812 models；
First output end OUT1 of the ADCINA0 pin connection signal conditioning units of TMS320F2812 processors,
The second output terminal OUT2 of the ADCINB0 pin connection signal conditioning units of TMS320F2812 processors,
PWM1~PWM2 output pins of TMS320F2812 processors are sequentially connected SPWM1~SPWM2 pins of driving unit.
4. the DC magnetic biasing suppression device according to claim 1 with duplicate protection, which is characterized in that the driving is single
Member uses DA926D7 driving circuits；
The GND pin of driving circuit is grounded；
+ 15V the pins of the VCC pin connection DC power supplier of driving circuit；
The pins of the SPWM1 of driving circuit~2 are sequentially connected the pins of PWM1~2 of dsp processor；
The pins of the Output1 of driving circuit~2 are connected to the first insulated gate transistor VT in turn1Base stage G1 and second insulation
Gate type transistor VT2On~G2.
5. a kind of control method of the DC magnetic biasing suppression device with duplicate protection, which is characterized in that use claim 1 institute
The DC magnetic biasing suppression device with duplicate protection stated, includes the following steps：
Step 1：Pass through the first Current Transmit1DC component in transformer neutral current is detected；
Step 2：Pass through the first Current Transmit1The DC component detected is compared with the direct current threshold value of setting；
If the first Current Transmit1The DC component detected is less than the direct current threshold value of setting, transformer neutral earthing switch
K1It is closed stopping direct current switch K simultaneously2It disconnects, blocking capacitor C is detached from circuit, return to step 1；
If the first Current Transmit1The DC component detected is more than the direct current threshold value of setting, transformer neutral earthing switch
K1Disconnect stopping direct current switch K simultaneously2It is closed, blocking capacitor C puts into operation；
Step 3：Pass through the second Current Transmit2Alternating current to flowing through blocking capacitor C is detected；
Step 4：By the second Current Transmit2The alternating current of the alternating current for flowing through blocking capacitor C and setting that detect
Stream threshold value is compared,
If the second Current Transmit2The alternating current for flowing through blocking capacitor C detected setting minimum threshold with most
Between big threshold value, then the first insulated gate transistor VT of reverse parallel connection is driven1With the second insulated gate transistor VT2Conducting, into
Enter step 6；Otherwise, 5 are entered step；
Step 5：If the second Current Transmit2The alternating current for flowing through blocking capacitor C detected is more than the exchange of setting
Electric current max-thresholds, bypass protection switch K3It is closed, while the first insulated gate transistor VT of reverse parallel connection1With the second insulation
Gate type transistor VT2Shutdown, enters step 7；Otherwise, return to step 3；
Step 6：If the various actions involved in step 4 or step 5 cannot be normally carried out, 7 are entered step；Otherwise, into step
Rapid 8；
Step 7：It puts into operation with Zinc-Oxide Arrester R in portable protective gaps circuit；
Step 8：After AC network trouble shooting, transformer neutral earthing switch K1It is first closed, then stopping direct current switch K2The side and
Protect switch K in road3It disconnects, return to step 1.
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| CN201810834519.8A CN108711829B (en) | 2018-07-26 | 2018-07-26 | Direct-current magnetic bias suppression device and method with double protection |
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| CN111416332A (en) * | 2020-03-16 | 2020-07-14 | 南方电网科学研究院有限责任公司 | Suppression device for direct current |
| CN111446708A (en) * | 2019-01-17 | 2020-07-24 | 国网山东省电力公司电力科学研究院 | Hierarchical adjustable series resistance power grid GIC restraining device and method |
| CN112803775A (en) * | 2020-12-31 | 2021-05-14 | 国创新能源汽车智慧能源装备创新中心(江苏)有限公司 | Method and system for detecting and inhibiting direct current component of transformer current |
| WO2022170282A1 (en) * | 2021-02-08 | 2022-08-11 | Techhold, Llc | Control system for transformer protection system |
| WO2024041734A1 (en) * | 2022-08-24 | 2024-02-29 | Hitachi Energy Ltd | Protection arrangement for a transformer |
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