CN106024497A - Auxiliary circuit for high-short-circuit turn-off direct current circuit breaker and control method for auxiliary circuit - Google Patents
Auxiliary circuit for high-short-circuit turn-off direct current circuit breaker and control method for auxiliary circuit Download PDFInfo
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- CN106024497A CN106024497A CN201610371352.7A CN201610371352A CN106024497A CN 106024497 A CN106024497 A CN 106024497A CN 201610371352 A CN201610371352 A CN 201610371352A CN 106024497 A CN106024497 A CN 106024497A
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000010521 absorption reaction Methods 0.000 claims abstract description 12
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 93
- 230000007423 decrease Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/59—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle
- H01H33/596—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle for interrupting dc
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention provides an auxiliary circuit for a high-short-circuit turn-off direct current circuit breaker. The direct current circuit breaker comprises shunt-wound energy absorption units and series-wound valve sections; the auxiliary circuit is connected at the two ends of each power electronic device in parallel; the auxiliary circuit comprises a first capacitive branch, a second capacitive branch, a control branch and a discharging branch; the first capacitive branch and the control branch form a first shunt-wound unit; the second capacitive branch and the discharging branch form a second shunt-wound unit; and the first shunt-wound unit and the second shunt-wound unit are connected in series. Compared with the prior art, by adoption of the auxiliary circuit for the high-short-circuit turn-off direct current circuit breaker and the control method for the auxiliary circuit provided by the invention, the turn-off current of the direct current circuit breaker can be effectively increased; the overvoltage at the two ends of each power electronic device can be lowered in the turn-off process; meanwhile, the influence on the power electronic device from the rapidly increased electric stress when the power electronic device is in short circuit can be effectively restrained, so that it is the key factor contributed to the performance improvement of the direct current circuit breaker.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to an auxiliary circuit for a high-short-circuit turn-off direct-current circuit breaker and a control method thereof.
Background
The direct current circuit breaker is key equipment for bearing steady-state current, cutting off fault current and cutting off load current in a direct current transmission and distribution network, and can limit the expansion of a fault range and effectively clear faults. With the rapid development of a multi-terminal direct-current transmission technology, an intelligent power grid and direct-current distribution network technology and a distributed power supply and direct-current micro-grid technology, the direct-current circuit breaker has important significance for the reliable, high-quality and economic operation of a power grid. Meanwhile, the problems of no natural zero crossing point, no switching-on and switching-off overvoltage, no energy absorption and the like of the direct current become the research difficulty of the direct current circuit breaker.
The current technical route for the research of the direct current circuit breaker is mainly a hybrid direct current circuit breaker, for example, a hybrid direct current circuit breaker in which a mechanical switch and a full-control device are connected in series is adopted in patent WO2011141054A1 of ABB company, and in order to realize bidirectional current flow of a main cut-off branch, the number of elements needs to be doubled, so that the equipment cost is greatly increased; and the national power grid intelligent power grid research institute patent 201310364653.3 adopts a hybrid direct current circuit breaker composed of a fully-controlled power electronic device, a mechanical switch direct current load switch and a freewheeling diode, so that the equipment cost and the control complexity are obviously reduced. However, stray inductance exists between the bus and the IGBT and between the series IGBTs, so that the series IGBTs can bear huge electrical stress in the turn-off process, and meanwhile, compared with the scheme of an ABB company, the turn-off current value of the direct current breaker based on the topology has a larger lifting space, so that the patent faces huge challenges in practical application.
Disclosure of Invention
To meet the needs of the prior art, the present invention provides an auxiliary circuit for a high short-circuit shutdown dc circuit breaker and a control method thereof.
In a first aspect, the technical solution of the auxiliary circuit for a high short-circuit shutdown dc circuit breaker in the present invention is:
the direct current circuit breaker comprises an energy absorption unit and a series valve section which are connected in parallel; the energy absorption unit is formed by connecting at least two lightning arresters in parallel, and the series valve section is formed by connecting at least two power electronic devices in series; the auxiliary circuit is connected in parallel at two ends of the power electronic device;
the auxiliary circuit comprises a first capacitor branch, a second capacitor branch, a control branch and a discharge branch;
the first capacitor branch and the control branch form a first parallel unit, and the second capacitor branch and the discharge branch form a second parallel unit; the first parallel unit and the second parallel unit are connected in series.
Preferably, the positive electrode of the first capacitor branch is connected to the collector of the power electronic device, and the negative electrode of the second capacitor branch is connected to the emitter of the power electronic device.
Preferably, the first capacitor branch is formed by connecting a first capacitor and a first resistor in series;
the second capacitor branch comprises a second capacitor, and the capacitance value of the second capacitor is greater than that of the first capacitor.
Preferably, the control branch comprises a thyristor, and the conduction time range of the thyristor is the time period between the beginning of conduction and the turning off of the current cutoff of the power electronic device.
Preferably, the discharge branch comprises a second resistor;
the calculation formula of the resistance R of the second resistor is as follows:
R＝τ/C
wherein τ is a capacitor discharge time constant of the second capacitor branch, and C is a capacitance value of the second capacitor branch. In a second aspect, the technical solution of the method for controlling an auxiliary circuit for a high short-circuit shutdown dc circuit breaker of the present invention is:
the method comprises the following steps:
step 1: collecting the current of a collector of the power electronic device, and judging whether the power electronic device is conducted or not;
step 2: triggering a thyristor of the control branch within the conduction time of the power electronic device;
and step 3: and collecting the charging current of the second capacitor branch, and turning off the thyristor when the charging current is reduced from the peak value to zero.
Preferably, the on-time is 2 ms.
Preferably, in step 3, when the charging current of the second capacitor branch decreases from the peak value to zero, the lightning arrester of the energy absorption unit is turned on, and the high-voltage short-circuit current flows through the lightning arrester for consumption.
Preferably, after the high-voltage short-circuit current is released through the lightning arrester, the second capacitor branch is discharged through the discharge branch;
and after the second capacitor branch is discharged, the voltage values at the two ends of the first capacitor are the voltage values at the two ends of the power electronic device, and the voltage values at the two ends of the second capacitor are zero.
Compared with the closest prior art, the invention has the beneficial effects that:
1. the auxiliary circuit for the high short circuit turn-off direct current breaker and the control method thereof can effectively improve the turn-off current of the direct current breaker, reduce the overvoltage at two ends of each power electronic device in the turn-off process, and simultaneously effectively inhibit the influence of the electrical stress which is sharply improved when the power electronic devices are in short circuit on the power electronic devices, thereby playing a key role in improving the performance of the direct current breaker;
2. according to the auxiliary circuit for the high-short-circuit turn-off direct-current circuit breaker and the control method thereof, when the power electronic device enters a short-circuit state and works in an active area to enable the conduction voltage Vce of the power electronic device to rise rapidly, the rise of the conduction voltage Vce can be effectively limited, and time is won for driving protection starting.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1: the invention discloses an auxiliary circuit schematic diagram for a high short circuit turn-off direct current breaker;
FIG. 2: the invention discloses an auxiliary circuit schematic diagram for a high short circuit turn-off direct current breaker;
FIG. 3: the embodiment of the invention discloses a schematic diagram of a current interruption unit of a direct current breaker;
FIG. 4: the circuit diagram of the current interruption unit of the direct current circuit breaker in the embodiment of the invention;
FIG. 5: the embodiment of the invention provides a topological schematic diagram of a T-shaped direct current breaker;
wherein, 1: an isolating switch; 2: a current limiting inductor; 3: an IGBT; 4: a fast mechanical switch; 5: an IGBT; 6: a lightning arrester; 7: valve sections are connected in series.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
An embodiment of an auxiliary circuit for a high short circuit shutdown dc circuit breaker according to the present invention is shown in fig. 3 and 4, which is connected in parallel to both ends of a series valve section and an energy absorption unit of the dc circuit breaker, wherein,
in this embodiment, the energy absorption unit is connected in parallel with the series valve section, the energy absorption unit is formed by connecting at least two lightning arresters in parallel, and the series valve section is formed by connecting at least two power electronic devices in series. The auxiliary circuit is connected in parallel across the power electronics.
As shown in fig. 1, the auxiliary circuit includes a first capacitor branch, a second capacitor branch, a control branch and a discharge branch. Wherein,
the first capacitor branch and the control branch form a first parallel unit, and the second capacitor branch and the discharge branch form a second parallel unit; the first parallel unit and the second parallel unit are connected in series.
The positive pole of the first capacitor branch is connected with the collector of the power electronic device, and the negative pole of the second capacitor branch is connected with the emitter of the power electronic device.
1. First capacitor branch
As shown in fig. 2, the first capacitor branch is formed by connecting a first capacitor C1 and a first resistor R1 in series.
In this embodiment, the capacitance value of the first capacitor is small, so that the circuit can work normally, and the first capacitor can bear the bus voltage when the power electronic device is not turned on. Meanwhile, the first capacitor branch circuit also plays a role in buffering the control circuit, and voltage overshoot and reverse recovery current of the outgoing line in the turn-off process of the thyristor in the control branch circuit can be effectively reduced.
2. Second capacitor branch
As shown in fig. 2, the second capacitive branch comprises a second capacitance C2.
In this embodiment, the first capacitor C1 isolates the bus voltage, so that the voltage is not applied to the second capacitor C1. The first capacitor C should be smaller than 5Uf, so the capacitance of the second capacitor C2 is larger than that of the first capacitor C1. The capacitance value of the second capacitor is large, so that the second capacitor can be guaranteed not to have charging current when a circuit normally runs, the second capacitor is charged by fault current through the conducting thyristor when the circuit is in fault, on one hand, the fault circuit can be absorbed, and on the other hand, the buffer of turn-off voltage stress and short-circuit voltage stress can be provided for the power electronic device.
3. Control branch
As shown in fig. 2, the control branch includes a thyristor D1.
In this embodiment, the on-time range of the thyristor D1 is the time period between the start of on-commutation and the turn-off of the power electronic device, that is, the thyristor D1 may be turned on after the on-commutation of the power electronic device and before the turn-off of the power electronic device. After the thyristor is turned on and before the power electronic device is turned off, the second capacitor C2 is not charged because the conducting voltage Vce of the power electronic device is borne across the second capacitor C2; after the power electrical device is turned off, the voltage across the power electronic device rapidly rises due to the induced voltage generated by the line inductance and the stray inductance, so that the second capacitor is charged.
4. Discharge branch
As shown in fig. 2, the discharge branch includes a second resistor R2.
In this embodiment, the resistance of the second resistor R2 is determined according to the discharge time of the second capacitor. The discharge time and the static voltage-sharing requirement enable the value of the second resistor not to be too large, and the power consumption requirement of the static voltage-sharing enables the value of the second resistor not to be too small. The resistance R of the second resistor R2 is calculated as:
R＝τ/C (1)
τ is a capacitor discharge time constant of the second capacitor C2 in the second capacitor branch, C is a capacitance value of the second capacitor C2, and C is 50uF in this embodiment.
The invention provides a control method of an auxiliary circuit for a high short circuit cut-off direct current breaker, which comprises the following steps:
1. and collecting the current of a collector of the power electronic device and judging whether the power electronic device is conducted or not.
The on time is 2ms in this embodiment.
2. The thyristors of the control branch are triggered during the conduction time of the power electronics.
3. And collecting the charging current of the second capacitor branch, and turning off the thyristor when the charging current is reduced from the peak value to zero.
In this embodiment, when the charging current of the second capacitor branch decreases from the peak value to zero, the lightning arrester of the energy absorption unit is turned on, and the high-voltage short-circuit current flows through the lightning arrester for consumption. Wherein,
and if the high-voltage short-circuit current is released through the lightning arrester, the second capacitor branch circuit discharges through the discharging branch circuit. And after the second capacitor branch is discharged, the voltage values at the two ends of the first capacitor are the voltage values at the two ends of the power electronic device, and the voltage values at the two ends of the second capacitor are zero.
The invention takes the T-type dc circuit breaker shown in fig. 5 as an example to explain the auxiliary circuit for the high short circuit shutdown dc circuit breaker, in this embodiment, it is assumed that the current flows from the disconnecting switch 1 to the fast mechanical switch 8, and the working process of the dc circuit breaker is as follows:
1. normal operation
When the line normally works, the IGBT3 and the IGBT5 are turned on, and current flows through the isolating switch 1, the current-limiting inductor 2, the IGBT3, the fast mechanical switch 4 and the IGBT5 in sequence.
2. Operation of current conversion
When the tail end of the line breaks down and the fault current continuously rises, the commutation process is started, the IGBT7 is switched on in a pilot mode, then the IGBT5 is switched off, the current flows through the isolating switch 1, the current-limiting inductor 2, the IGBT3 and the IGBT7 in sequence, and after 2ms, when the quick mechanical switch 4 is switched off, the commutation work is finished, and the current-breaking work is started.
3. Cutting off work
When the current interruption starts, the IGBT7 is turned off, and at this time, the fault current flows through the arrester 6, and the short-circuit energy is consumed in the arrester. Finally, the isolating switch 1 is disconnected, and the direct current breaker cuts off the line.
The working principle of the auxiliary circuit in the working process of the direct current breaker is as follows:
1. normal operation
When the line normally works, the first capacitor C1 in the first capacitor branch bears the voltage at two ends of the IGBT, and the second capacitor in the second capacitor branch does not bear the voltage.
2. Operation of current conversion
When the commutation process starts, the thyristor D1 of the control branch is turned on, and the first capacitor branch is short-circuited, but no current flows through the second capacitor C2 because the voltage across the second capacitor C2 is the turn-on voltage Vce of the IGBT.
3. Cutting off work
When the switching-off process begins, the IGBT7 is switched off, and the voltage across the IGBT rises sharply, which charges the second capacitor C2 via the control branch. At this time, the fault current flows through the isolating switch 1, the current-limiting inductor 2, the thyristor D1 and the second capacitor C2 in sequence, and the fault current can be obtained according to the circuit principle when the resistance on the branch circuit flows throughThe current on the circuit will oscillate. The oscillation causes the current amplitude to continuously rise, which shows that the charging current of the second capacitor continuously rises, and finally falls to zero after reaching the peak value. Then, since the thyristor D1 cannot pass the copy current, the ground fault of the path is zero, and the thyristor D1 can be turned off.
When the charging current of the second capacitor is reduced to zero from the peak value, the voltage at two ends of the second capacitor is also continuously increased, and finally the lightning arrester is conducted, so that the short-circuit current is consumed through the lightning arrester, and finally the short-circuit energy is consumed.
And after the lightning arrester consumes the short-circuit energy, the second capacitor discharges through the second resistor of the discharge branch. At this time, the voltages at the two ends of the first capacitor and the second capacitor are redistributed, and the final distribution result is as follows: the voltage at the two ends of the first capacitor C1 rises to the voltage at the two ends of the IGBT from the conducting voltage 0.7V of the thyristor D1, the voltage at the two ends of the second capacitor C2 continuously drops to zero, and the capacitor voltage is redistributed. The auxiliary circuit enters a pre-on state in preparation for the next turn-off buffering.
Finally, it should be noted that: the described embodiments are only some embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Claims (9)
1. An auxiliary circuit for a high short-circuit shutdown direct current circuit breaker, the direct current circuit breaker comprising an energy absorption unit and a series valve section connected in parallel; the energy absorption unit is formed by connecting at least two lightning arresters in parallel, and the series valve section is formed by connecting at least two power electronic devices in series; the auxiliary circuit is characterized in that the auxiliary circuit is connected in parallel at two ends of the power electronic device;
the auxiliary circuit comprises a first capacitor branch, a second capacitor branch, a control branch and a discharge branch;
the first capacitor branch and the control branch form a first parallel unit, and the second capacitor branch and the discharge branch form a second parallel unit; the first parallel unit and the second parallel unit are connected in series.
2. An auxiliary circuit for a high short-circuit shutdown dc circuit breaker according to claim 1, wherein the positive pole of the first capacitive branch is connected to the collector of the power electronic device and the negative pole of the second capacitive branch is connected to the emitter of the power electronic device.
3. An auxiliary circuit for a high short-circuit shutdown DC circuit breaker according to claim 1,
the first capacitor branch is formed by connecting a first capacitor and a first resistor in series;
the second capacitor branch comprises a second capacitor, and the capacitance value of the second capacitor is greater than that of the first capacitor.
4. An auxiliary circuit for a high short-circuit shutdown DC circuit breaker according to claim 1,
the control branch comprises a thyristor, and the conduction time range of the thyristor is the time period between the beginning of the conduction of the power electronic device and the turning-off of the current-cutoff.
5. An auxiliary circuit for a high short-circuit shutdown DC circuit breaker according to claim 1,
the discharge branch comprises a second resistor;
the calculation formula of the resistance R of the second resistor is as follows:
R＝τ/C
wherein τ is a capacitor discharge time constant of the second capacitor branch, and C is a capacitance value of the second capacitor branch.
6. A control method based on an auxiliary circuit as claimed in claims 1-5, characterized in that the method comprises:
step 1: collecting the current of a collector of the power electronic device, and judging whether the power electronic device is conducted or not;
step 2: triggering a thyristor of the control branch within the conduction time of the power electronic device;
and step 3: and collecting the charging current of the second capacitor branch, and turning off the thyristor when the charging current is reduced from the peak value to zero.
7. A method of controlling an auxiliary circuit as claimed in claim 6, characterized in that the on-time is 2 ms.
8. The method for controlling the auxiliary circuit according to claim 6, wherein in the step 3, when the charging current of the second capacitor branch decreases from the peak value to zero, the lightning arrester of the energy absorption unit is turned on, and the high-voltage short-circuit current flows through the lightning arrester for consumption.
9. A control method of an auxiliary circuit as claimed in claim 8,
after the high-voltage short-circuit current is released through the lightning arrester, the second capacitor branch is discharged through the discharging branch;
and after the second capacitor branch is discharged, the voltage values at the two ends of the first capacitor are the voltage values at the two ends of the power electronic device, and the voltage values at the two ends of the second capacitor are zero.
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Cited By (6)
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| CN108717909A (en) * | 2018-06-28 | 2018-10-30 | 河南森源电气股份有限公司 | A kind of dc circuit breaker for low-voltage direct |
| CN109361204A (en) * | 2018-09-16 | 2019-02-19 | 王雪燕 | A kind of arc-extinction device and method can be used for power grid AC and DC breaker |
| CN112703675A (en) * | 2018-09-18 | 2021-04-23 | 西门子股份公司 | Switching device for breaking a current path |
| CN113179011A (en) * | 2021-05-17 | 2021-07-27 | 阳光储能技术有限公司 | Power supply circuit, control method thereof, capacitor discharge circuit and power conversion circuit |
| CN114024323A (en) * | 2021-10-29 | 2022-02-08 | 株洲中车时代半导体有限公司 | Auxiliary power supply circuit of switching control device and electronic device switching circuit |
| WO2023011768A1 (en) * | 2021-08-04 | 2023-02-09 | Vitesco Technologies GmbH | Circuit breaker unit |
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