CN111865076A - Direct-current voltage reduction circuit applied to energy supply of relay protection device of transformer substation - Google Patents
Direct-current voltage reduction circuit applied to energy supply of relay protection device of transformer substation Download PDFInfo
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- CN111865076A CN111865076A CN202010588260.0A CN202010588260A CN111865076A CN 111865076 A CN111865076 A CN 111865076A CN 202010588260 A CN202010588260 A CN 202010588260A CN 111865076 A CN111865076 A CN 111865076A
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- 239000003990 capacitor Substances 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims description 11
- 101100340331 Arabidopsis thaliana IDM1 gene Proteins 0.000 claims description 9
- COCLLEMEIJQBAG-UHFFFAOYSA-N 8-methylnonyl 2-methylprop-2-enoate Chemical compound CC(C)CCCCCCCOC(=O)C(C)=C COCLLEMEIJQBAG-UHFFFAOYSA-N 0.000 claims description 6
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/06—Arrangements for supplying operative power
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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
- H02J11/00—Circuit arrangements for providing service supply to auxiliaries of stations in which electric power is generated, distributed or converted
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides a direct current voltage reduction circuit applied to energy supply of a relay protection device of a transformer substation, which comprises a three-coil coupling inductor, a capacitor, two power switch tubes, a diode and a load resistor, wherein the three-coil coupling inductor is connected with the capacitor; one power switch tube is connected with the three-coil coupling inductor, the load resistor and the power supply in series, and the other power switch tube is connected with the capacitor in series and then connected with the diode and the load resistor in parallel. The circuit of the invention has simple structure, more conversion gain freedom and wide range, can flexibly convert 220V direct current voltage into 48V, 24V, 12V, 5V and other voltage values required by a relay protection device, and realizes flexible application of the power converter.
Description
Technical Field
The invention provides a direct current voltage reduction circuit applied to energy supply of a relay protection device of a transformer substation, and belongs to the technical field of power electronic converters.
Background
The secondary protection device in the transformer substation is important for reliable operation of primary power equipment, the failure rate of the primary equipment is reduced, and the failure damage degree of the primary equipment is reduced. The power supply of the station relay protection device is DC voltages of 48V, 24V, 12V and 5V, and the DC voltages are converted from 220V DC voltage. The existing voltage reduction technology has narrow gain conversion range and less freedom degree, and can not realize the modular application of all relay protection device power supplies in a station, so how to seek a direct current voltage reduction conversion module technology with wide range and high freedom degree becomes a hotspot of research.
Disclosure of Invention
The invention aims to provide a direct-current voltage reduction circuit applied to energy supply of a relay protection device of a transformer substation, and the direct-current voltage reduction circuit is used for solving the problems.
The invention relates to a direct-current voltage reduction circuit applied to energy supply of a relay protection device of a transformer substation, which comprises a three-coil coupling inductor, a capacitor, two power switch tubes, a diode and a load resistor, wherein the three-coil coupling inductor is connected with the capacitor; one power switch tube is connected with the three-coil coupling inductor, the load resistor and the power supply in series, and the other power switch tube is connected with the capacitor in series and then connected with the diode and the load resistor in parallel.
Preferably, the power supply comprises a first coupling inductor N1, a second coupling inductor N2, a third coupling inductor NA, a diode DM1, a second power switch M2, a third power switch MA, a clamping capacitor CA and an output load R; the drain of the second power switch tube M2 is connected with the positive electrode of the power source Vin, the source of the second power switch tube M2 is connected with one end of a second coupling inductor N2, the other end of the second coupling inductor N2 is connected with one end of a third coupling inductor NA and one end of a clamping capacitor CA, the other end of the third coupling inductor NA is connected with one end of a first coupling inductor N1 and the anode of a diode DM1, the other end of the first coupling inductor N1 is connected with one end of a load R, the drain of the third power switch tube MA is connected with the other end of the clamping capacitor CA, and the source of the third power switch tube MA is connected with the negative electrode of the power source Vin, the cathode of the diode DM1 and the.
Preferably, the gain expression is:
d is the conduction duty ratio of the power switch tube, N is N2/N1, and NA is NA/N1.
The working process of the direct current voltage reduction circuit is divided into 7 switching modes, namely a switching mode 1 to a switching mode 7.
Preferably, in the switching mode 1, the second power switching tube M2 is turned on, and the exciting inductor LM is charged linearly.
Preferably, in the switching mode 2, due to the existence of the leakage inductance LKi, the third power switching tube MA is turned on at zero current, the diode DM1 is turned on, the leakage inductance LKA resonates with the clamping capacitor CA, and the current IA decreases; the leakage inductance LK2 and the clamp capacitor CA resonate to cause the current I2 to rise; meanwhile, the voltage VL applies a voltage to the leakage inductance LK1 and the second coupling inductance N2 through the diode DM1, and the current I1 falls at a slower speed than the current IA; mode 2 ends when the leakage inductance LKA and leakage inductance LK1 currents are equal.
Preferably, the switching mode 3 is at the mode start, and the diode DM1 is turned off with zero current; LK1 and LKA transmit energy to the coil 1, leakage inductance LK2 and clamping capacitor CA resonate, current flowing into a low-voltage side rises, and current of a third power switch tube MA falls; when the MA current of the third power switch tube is zero, mode 3 ends.
Preferably, in the switching mode 4, when the MA current of the third power switching tube is zero and the IM2 decreases, the current IMA is reversed through the diode DMA; the resonance continues, the current flows through the diode DM2 and the diode DMA, the second power switch tube M2, the third power switch tube MA and the phase-shifted full bridge ZVZCS are switched off; resonance ends when the ZCS is turned off at time t4 when DM 2.
Preferably, in the switching mode 5, when the diode DM2 is turned off, the diode DM1 is turned on, and the leakage inductance LK1 transfers energy to the coil 2; leakage inductance LKA resonates with clamp capacitor CA and current IDMA decreases while current IDM1 increases, and when current ILM is reached, current IDMA is zero and mode 5 ends.
Preferably, the switching mode 6 starts, the diode DMA zero-current switch is turned off, and the exciting inductor LM is linearly charged by the load.
Preferably, when the second power switch M2 is switched on due to the leakage inductance LK2 zero current, the switching mode 7 starts; when the current IDM1 falls, the current ILK2 and the current ILKA rise linearly, when the current IDM1 is zero, all leakage currents reach the current ILM/(N +1), and at the end of the mode, the zero-current switch of the diode DM1 is turned off.
Compared with the prior art, the invention has the beneficial effects that:
compared with the prior art, the invention has the advantages of simple circuit structure, more conversion gain freedom degrees and wide range, can flexibly convert 220V direct current voltage into voltage values of 48V, 24V, 12V, 5V and the like required by a relay protection device, and realizes flexible application of the power converter.
Drawings
Fig. 1 is a direct current voltage reduction technology applied to the power supply of a relay protection device of a transformer substation;
Fig. 2 is a mode diagram of a dc voltage reduction technique applied to the power supply of the relay protection device of the substation;
fig. 3 is an equivalent circuit diagram of a switching mode 1 of a direct-current step-down technique applied to the power supply of the relay protection device of the transformer substation;
fig. 4 is an equivalent circuit diagram of a dc step-down technique switch mode 2 applied to the power supply of the relay protection device of the transformer substation;
fig. 5 is an equivalent circuit diagram of a dc step-down technique switch mode 3 applied to the power supply of the relay protection device of the substation;
fig. 6 is an equivalent circuit diagram of a dc step-down technique switch mode 4 applied to the power supply of the relay protection device of the transformer substation;
fig. 7 is an equivalent circuit diagram of a dc step-down technique switch mode 5 applied to the power supply of the relay protection device of the transformer substation;
fig. 8 is an equivalent circuit diagram of a dc step-down technique switch mode 6 applied to the power supply of the relay protection device of the substation;
fig. 9 is an equivalent circuit diagram of a switching mode 7 of a dc step-down technique applied to power supply of a relay protection device of a substation;
Detailed Description
Example 1
As shown in the figures, the invention is further described below with reference to the accompanying drawings: the invention relates to a direct-current voltage reduction circuit applied to energy supply of a relay protection device of a transformer substation, which comprises a three-coil coupling inductor, a capacitor, two power switch tubes, a diode and a load resistor, wherein the three-coil coupling inductor is connected with the capacitor; one power switch tube is connected with the three-coil coupling inductor, the load resistor and the power supply in series, and the other power switch tube is connected with the capacitor in series and then connected with the diode and the load resistor in parallel.
Specifically, the power supply comprises a first coupling inductor N1, a second coupling inductor N2, a third coupling inductor NA, a diode DM1, a second power switch tube M2, a third power switch tube MA, a clamping capacitor CA and an output load R; the drain of the second power switch tube M2 is connected with the positive electrode of the power source Vin, the source of the second power switch tube M2 is connected with one end of a second coupling inductor N2, the other end of the second coupling inductor N2 is connected with one end of a third coupling inductor NA and one end of a clamping capacitor CA, the other end of the third coupling inductor NA is connected with one end of a first coupling inductor N1 and the anode of a diode DM1, the other end of the first coupling inductor N1 is connected with one end of a load R, the drain of the third power switch tube MA is connected with the other end of the clamping capacitor CA, and the source of the third power switch tube MA is connected with the negative electrode of the power source Vin, the cathode of the diode DM1 and the.
Vin is an input power supply, and a first coupling inductor N1, a second coupling inductor N2, a third coupling inductor NA, a diode DM1, a second power switch tube M2, a third power switch tube MA, a clamping capacitor CA and an output load R, LM and LKi are an excitation inductor and an equivalent leakage inductor of the coupling inductors.
The working process is divided into 7 switching modes, namely a switching mode 1 to a switching mode 7, and the specific description is as follows:
Switching mode 1, corresponding to [ t0, t1] in fig. 2: the equivalent circuit is as shown in fig. 3, M2 is on and the magnetizing inductor is charged linearly.
Switching mode 2, corresponding to [ t1, t2] in fig. 2: equivalent circuit as shown in fig. 4, at time t1, due to the presence of leakage inductance, MA is conducting with zero current, DM1 is conducting, LKA resonates with CA, and current IA drops. In addition, LK2 and CA resonated causing I2 to rise. Meanwhile, VL applies a voltage across LK1 and N2 through DM1, I1 falls slower than IA. Mode 2 ends when LKA and LK1 currents are equal.
Switching mode 3, corresponding to [ t2, t3] in fig. 2: equivalent circuit as shown in fig. 5, at the modal start, DM1 is turned off with zero current. LK1 and LKA phase coil 1 transmit energy, LK2 and CA resonate, a low-voltage side current rises, and an MA current falls. Mode 3 ends when the MA current is zero.
Switching mode 4, corresponding to [ t3, t4] in fig. 2: equivalent circuit as shown in fig. 6, at time t3, the MA current is zero and when the IM2 drops, the IMA reverses direction through DMA. The resonance continues with current flowing through DM2 and DMA, M2 and MA ZVZCS off. Resonance ends when the ZCS is turned off at time t4 when DM 2.
Switching mode 5, corresponding to [ t4, t5] in fig. 2: as shown in fig. 7, at time t5, DM2 turns off, DM1 turns on, and LK1 transfers energy to coil 2. LKA and CA resonate, IDMA falls, IDM1 rises, IDMA is zero when ILM is reached, and mode 5 ends.
Switching mode 6, corresponding to [ t5, t6] in fig. 2: equivalent circuit as shown in fig. 8, the mode starts, DMA ZCS turns off, and LM is charged linearly by the load.
Switching mode 7, corresponding to [ t6, t7] in fig. 2: equivalent circuit as shown in fig. 9, this mode starts when M2 is turned on because LK2 ZCS is turned on. When IDM1 falls, ILK2 and ILKA rise linearly, and when IDM1 is zero, all leakage inductance currents reach ILM/(N +1), and at the end of the mode, DM1 ZCS turns off.
The gain expression from the above analysis is:
wherein, D is the on duty cycle N of the power switch tube, which is N2/N1, and NA/N1.
Claims (10)
1. A direct current voltage reduction circuit applied to the energy supply of a relay protection device of a transformer substation is characterized by comprising a three-coil coupling inductor, a capacitor, two power switch tubes, a diode and a load resistor; one power switch tube is connected with the three-coil coupling inductor, the load resistor and the power supply in series, and the other power switch tube is connected with the capacitor in series and then connected with the diode and the load resistor in parallel.
2. The direct-current voltage reduction circuit applied to the power supply of the substation relay protection device is characterized by comprising a first coupling inductor N1, a second coupling inductor N2, a third coupling inductor NA, a diode DM1, a second power switch tube M2, a third power switch tube MA, a clamping capacitor CA and an output load R; the drain of the second power switch tube M2 is connected with the positive electrode of the power source Vin, the source of the second power switch tube M2 is connected with one end of a second coupling inductor N2, the other end of the second coupling inductor N2 is connected with one end of a third coupling inductor NA and one end of a clamping capacitor CA, the other end of the third coupling inductor NA is connected with one end of a first coupling inductor N1 and the anode of a diode DM1, the other end of the first coupling inductor N1 is connected with one end of a load R, the drain of the third power switch tube MA is connected with the other end of the clamping capacitor CA, and the source of the third power switch tube MA is connected with the negative electrode of the power source Vin, the cathode of the diode DM1 and the.
3. The direct-current voltage reduction circuit applied to the power supply of the relay protection device of the substation according to claim 1, wherein the gain expression is as follows:
d is the conduction duty ratio of the power switch tube, N is N2/N1, and NA is NA/N1.
The working process of the direct current voltage reduction circuit is divided into 7 switching modes, namely a switching mode 1 to a switching mode 7.
4. The direct-current voltage reduction circuit applied to power supply of the substation relay protection device according to claim 1, wherein the second power switch tube M2 is turned on in switching mode 1, and the excitation inductor LM is charged linearly.
5. The direct-current voltage reduction circuit applied to the power supply of the substation relay protection device is characterized in that in the switching mode 2, due to the existence of the leakage inductance LKi, the third power switch tube MA is conducted at zero current, the diode DM1 is conducted, the leakage inductance LKA and the clamping capacitor CA resonate, and the current IA is reduced; the leakage inductance LK2 and the clamp capacitor CA resonate to cause the current I2 to rise; meanwhile, the voltage VL applies a voltage to the leakage inductance LK1 and the second coupling inductance N2 through the diode DM1, and the current I1 falls at a slower speed than the current IA; mode 2 ends when the leakage inductance LKA and leakage inductance LK1 currents are equal.
6. The direct-current voltage reduction circuit applied to the power supply of the substation relay protection device is characterized in that the switch mode 3 is started in a mode, and the diode DM1 is turned off at zero current; LK1 and LKA transmit energy to the coil 1, leakage inductance LK2 and clamping capacitor CA resonate, current flowing into a low-voltage side rises, and current of a third power switch tube MA falls; when the MA current of the third power switch tube is zero, mode 3 ends.
7. The direct-current voltage reduction circuit applied to the power supply of the substation relay protection device in claim 1, wherein in the switching mode 4, when the MA current of the third power switching tube is zero and the IM2 decreases, the IMA current is reversed through a diode DMA; the resonance continues, the current flows through the diode DM2 and the diode DMA, the second power switch tube M2, the third power switch tube MA and the phase-shifted full bridge ZVZCS are switched off; resonance ends when the ZCS is turned off at time t4 when DM 2.
8. The direct-current voltage reduction circuit applied to the power supply of the substation relay protection device is characterized in that when the diode DM2 is turned off in the switching mode 5, the diode DM1 is turned on, and the leakage inductance LK1 transfers energy to the coil 2; leakage inductance LKA resonates with clamp capacitor CA and current IDMA decreases while current IDM1 increases, and when current ILM is reached, current IDMA is zero and mode 5 ends.
9. The direct-current voltage reduction circuit applied to the power supply of the substation relay protection device is characterized in that the switch mode 6 is started, the diode DMA zero-current switch is turned off, and the excitation inductor LM is linearly charged by a load.
10. The direct-current voltage reduction circuit applied to the power supply of the substation relay protection device in claim 1, wherein when a second power switch tube M2 is switched on due to zero current of a leakage inductance LK2, a switching mode 7 is started; when the current IDM1 falls, the current ILK2 and the current ILKA rise linearly, when the current IDM1 is zero, all leakage currents reach the current ILM/(N +1), and at the end of the mode, the zero-current switch of the diode DM1 is turned off.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010588260.0A CN111865076A (en) | 2020-06-24 | 2020-06-24 | Direct-current voltage reduction circuit applied to energy supply of relay protection device of transformer substation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010588260.0A CN111865076A (en) | 2020-06-24 | 2020-06-24 | Direct-current voltage reduction circuit applied to energy supply of relay protection device of transformer substation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113765367A (en) * | 2021-10-19 | 2021-12-07 | 哈尔滨理工大学 | Tap inductance step-down transformer in synchronous conduction mode |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113765367A (en) * | 2021-10-19 | 2021-12-07 | 哈尔滨理工大学 | Tap inductance step-down transformer in synchronous conduction mode |
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