CN115425830A - Straight-through protection circuit of gentle straight IGCT power module - Google Patents
Straight-through protection circuit of gentle straight IGCT power module Download PDFInfo
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- CN115425830A CN115425830A CN202211137764.6A CN202211137764A CN115425830A CN 115425830 A CN115425830 A CN 115425830A CN 202211137764 A CN202211137764 A CN 202211137764A CN 115425830 A CN115425830 A CN 115425830A
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- 239000003990 capacitor Substances 0.000 claims abstract description 50
- 238000001514 detection method Methods 0.000 claims description 42
- 238000011084 recovery Methods 0.000 claims description 16
- 238000012806 monitoring device Methods 0.000 abstract 1
- 238000012544 monitoring process Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
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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
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
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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
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/66—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal
- H02M7/68—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters
- H02M7/72—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/75—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/757—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/7575—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only for high voltage direct transmission link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- 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)
- Rectifiers (AREA)
Abstract
The invention discloses a direct-current protection circuit of a flexible direct-current integrated circuit (IGCT) power module, wherein thyristors are connected in parallel at two ends of a direct-current capacitor in a half-bridge IGCT-MMC power module to form a short-circuit current shunt channel, or the thyristors are connected in parallel at two ends of two power devices in the half-bridge IGCT-MMC power module to form the short-circuit current shunt channel, a direct-current monitoring device is used for monitoring and reporting the direct current to a module control board, the module control board sends out a thyristor triggering and conducting signal, the thyristor is conducted and shunted, and a power main circuit component is protected from being damaged due to the fact that large short-circuit current flows through the thyristor. The two schemes effectively improve the reliability of the bypass of the power module and lay a guarantee foundation for the operation of the power module of the flexible direct current converter valve.
Description
Technical Field
The invention belongs to the field of flexible direct-current power transmission systems, and particularly relates to a direct-current protection circuit of a flexible direct-current integrated circuit (IGCT) power module.
Background
The modular multilevel converter based HVDC (MMC-HVDC) technology is a novel voltage source converter DC transmission technology, and has good application prospect in the DC transmission technology by virtue of the advantages of high electric energy quality, high reliability, low loss and the like. At present, an Insulated Gate Bipolar Transistor (IGBT) is adopted as a main power switch device of the MMC, and the traditional converter valve technology based on the IGBT faces the limitation of large-scale engineering application such as large volume, heavy weight, high cost and the like. The IGCT device converter valve based on higher voltage and larger current has the advantages of light weight, low loss and high reliability. IGCT devices are current-driven devices, and converter valves based on IGCT devices do not have the capability of turning off short-circuit currents larger than the maximum turn-off current thereof, so that the function of through short-circuit protection of the IGCT converter valves becomes particularly important.
In the operation process of the power module, after a direct short circuit fault (through T1 and T2 or through T1 and S) caused by the interference of a module control board, the interference of a driver, the interference of a bypass switch drive board, the abnormity of a drive optical fiber line and the like inevitably occurs, the IGCT power module does not have the self-turn-off capability of short circuit current, and the module is abnormal.
The key to solving the existing problems is to study the module through protection scheme by combining the operation condition of the flexible direct power module and the overcurrent turn-off capability of the IGCT device.
Disclosure of Invention
The invention aims to overcome the defects and provide the direct-through protection circuit of the flexible direct-current IGCT power module, which can improve the reliability of a power module bypass and lay a guarantee foundation for the operation of the flexible direct-current converter valve power module.
In order to achieve the purpose, the direct connection protection circuit of the flexible direct connection IGCT power module comprises a power device, a current detection device Isensor, a thyristor SCR, an anode reactor and a direct current capacitor C;
the two power devices are connected in series, the power devices are connected with a current detection device Isensor, the current detection device Isensor is connected with a direct current capacitor C, an anode reactor Ls is arranged between the direct current capacitor C and the power devices, and a thyristor SCR is connected in parallel at two ends of the direct current capacitor C to form a short-circuit current shunt channel;
the current detection device Isensor is connected with the module control board, and the module control board is connected with the thyristor SCR;
the current detection device Isensor is used for collecting a direct current value of the power device and feeding the current value back to the module control board;
and the module control board is used for controlling the conduction and the closing of the thyristor SCR according to the feedback current value.
The power device comprises an integrated gate commutated thyristor and a fast recovery diode which are connected in reverse parallel.
And the two ends of the anode reactor are respectively connected with a clamping diode Ds and a clamping resistor Rs, the clamping diode Ds and the clamping resistor Rs are both connected with a clamping capacitor Cs, and the clamping capacitor Cs is connected with a current detection device Isensor.
And two ends of the direct current capacitor C are connected with a divider resistor R in parallel.
The alternating current ports of the power device are connected to the two ends of the lower tube power device in parallel, and a bypass switch S is arranged between the alternating current ports.
A direct connection protection circuit of a flexible direct connection IGCT power module comprises a power device, a current detection device Isensor, a thyristor SCR, an anode reactor and a direct current capacitor C;
the two power devices are connected in series, the power devices are connected with a current detection device Isensor, the current detection device Isensor is connected with a direct current capacitor C, an anode reactor Ls is arranged between a thyristor SCR and the direct current capacitor C, and the thyristor SCR is connected in parallel at two ends of the series power devices to form a short-circuit current shunt channel;
the current detection device Isensor is connected with the module control board, and the module control board is connected with the thyristor SCR;
the current detection device Isensor is used for collecting a direct current value of the power device and feeding the current value back to the module control board;
and the module control board is used for controlling the conduction and the closing of the thyristor SCR according to the feedback current value.
The power device comprises an integrated gate commutated thyristor and a fast recovery diode which are connected in reverse parallel.
And two ends of the anode reactor are respectively connected with a clamping diode Ds and a clamping resistor Rs, the clamping diode Ds and the clamping resistor Rs are both connected with a clamping capacitor Cs, and the clamping capacitor Cs is connected with a current detection device Isensor.
And two ends of the direct current capacitor C are connected with a divider resistor R in parallel.
The alternating current ports of the power device are connected to two ends of the lower tube power device in parallel, and a bypass switch S is arranged between the alternating current ports.
Compared with the prior art, the thyristor is connected in parallel at two ends of a direct current capacitor in the half-bridge IGCT-MMC power module to form a short-circuit current shunt channel, or the thyristor is connected in parallel at two ends of two power devices in the half-bridge IGCT-MMC power module to form a short-circuit current shunt channel, the current detection device monitors the direct current and reports the direct current to the module control board, the module control board sends out a thyristor triggering and conducting signal, the thyristor is conducted and shunted, and the power main loop component is protected from being damaged due to the fact that large short-circuit current flows through the component. The two schemes effectively improve the reliability of the bypass of the power module and lay a guarantee foundation for the operation of the power module of the flexible-direct converter valve.
Drawings
FIG. 1 shows the current flow direction before a through short circuit in example 1;
FIG. 2 shows the current flow after a through short circuit in example 1;
FIG. 3 shows the current flow direction before the through short circuit in example 2;
fig. 4 shows the current flow after the through short in example 2.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Example 1:
referring to fig. 1 and 2, the present invention includes a power device, a current detection device Isensor, a thyristor SCR, an anode reactor, and a dc capacitor C; the two power devices are connected in series, the power devices are connected with a current detection device Isensor, the current detection device Isensor is connected with a direct current capacitor C, an anode reactor Ls is arranged between the direct current capacitor C and the power devices, and a thyristor SCR is connected in parallel at two ends of the direct current capacitor C to form a short-circuit current shunt channel; the power device comprises a first power device and a second power device, the first power device comprises a first integrated gate pole commutation thyristor T1 and a first fast recovery diode D1, the first integrated gate pole commutation thyristor T1 and the first fast recovery diode D1 are connected in parallel in an opposite direction, the second power device comprises a second integrated gate pole commutation thyristor T2 and a second fast recovery diode D2, and the second integrated gate pole commutation thyristor T2 and the second fast recovery diode D2 are connected in parallel in an opposite direction. And the two ends of the anode reactor Ls are respectively connected with a clamping diode Ds and a clamping resistor Rs, the clamping diode Ds and the clamping resistor Rs are both connected with a clamping capacitor Cs, and the clamping capacitor Cs is connected with a current detection device Isensor. And two ends of the direct current capacitor C are connected with a divider resistor R in parallel. The alternating current ports of the power device are connected with the two ends of the lower tube power device in parallel, and a bypass switch S is arranged between the alternating current ports. The direct current capacitor C, the first integrated gate commutated thyristor T1, the first fast recovery diode D1 and the second power device comprise a second integrated gate commutated thyristor T2, a second fast recovery diode D2, a bypass switch S, a divider resistor R, an anode reactor Ls, a clamp diode Ds, a clamp resistor Rs and a clamp capacitor Cs to form a half-bridge IGCT-MMC power module.
The current detection device Isensor is connected with the module control board, and the module control board is connected with the thyristor SCR; the current detection device Isensor is used for collecting a direct current value of the power device and feeding the current value back to the module control board; and the module control board is used for controlling the conduction and the closing of the thyristor SCR according to the feedback current value.
After a power device generates a direct short circuit fault (a first integrated gate commutated thyristor T1 and a second integrated gate commutated thyristor T2 are directly connected or the first integrated gate commutated thyristor T1 and a bypass switch S are directly connected), when a current detection device Isensor monitors that a main circuit generates a direct short circuit, a thyristor SCR is switched on, and due to the existence of an anode reactor Ls, the impedance of the anode reactor Ls, the first integrated gate commutated thyristor T1, the second integrated gate commutated thyristor T2 and a direct current capacitor loop (a loop formed by the first power device, the second power device, the current detection device Isensor, the direct current capacitor C and the anode reactor Ls in the figures 1 and 2) is far larger than that of the direct current capacitor C and the thyristor SCR loop, so that short circuit current mainly passes through the loop formed by the direct current capacitor C and the thyristor SCR. The power main circuit component can be protected from being damaged by large short-circuit current flowing in the short-circuit process.
Example (b):
referring to fig. 3 and 4, the present invention includes a power device, a current detection device Isensor, a thyristor SCR, an anode reactor, and a dc capacitor C; the two power devices are connected in series, the power devices are connected with a current detection device Isensor, the current detection device Isensor is connected with a direct current capacitor C, an anode reactor Ls is arranged between a thyristor SCR and the direct current capacitor C, and the thyristor SCR is connected in parallel at two ends of the two power devices to form a short-circuit current shunt channel; the power device comprises a first power device and a second power device, the first power device comprises a first integrated gate pole commutation thyristor T1 and a first fast recovery diode D1, the first integrated gate pole commutation thyristor T1 and the first fast recovery diode D1 are connected in parallel in an opposite direction, the second power device comprises a second integrated gate pole commutation thyristor T2 and a second fast recovery diode D2, and the second integrated gate pole commutation thyristor T2 and the second fast recovery diode D2 are connected in parallel in an opposite direction. And two ends of the anode reactor are respectively connected with a clamping diode Ds and a clamping resistor Rs, the clamping diode Ds and the clamping resistor Rs are both connected with a clamping capacitor Cs, and the clamping capacitor Cs is connected with a current detection device Isensor. And two ends of the direct current capacitor C are connected with a divider resistor R in parallel. The alternating current ports of the power device are connected with the two ends of the lower tube power device in parallel, and a bypass switch S is arranged between the alternating current ports. .
The current detection device Isensor is connected with the module control board, and the module control board is connected with the thyristor SCR; the current detection device Isensor is used for collecting a direct current value of the power device and feeding the current value back to the module control board; and the module control board is used for controlling the conduction and the closing of the thyristor SCR according to the feedback current value.
After a power device has a direct short circuit fault (the first integrated gate commutated thyristor T1 and the second integrated gate commutated thyristor T2 are directly connected or the first integrated gate commutated thyristor T1 and the bypass switch S are directly connected), when the current detection device Isensor monitors that the main circuit has a direct short circuit, the thyristor SCR is switched on, and due to the existence of the anode reactor Ls, the short circuit current is further limited. In design, the impedance of the loop (the loop formed by the first integrated gate commutated thyristor T1 and the second integrated gate commutated thyristor T2 in fig. 3 and 4) of the switching device (the loop formed by the first power device, the second power device, the current detection device Isensor, the dc capacitor C and the anode reactor Ls) is greater than the impedance of the loop (the red loop in fig. 3 and 4 2) of the thyristor, so that the short-circuit current mainly flows through the loop formed by the dc capacitor and the thyristor (the loop formed by the thyristor SCR, the current detection device Isensor, the dc capacitor C and the anode reactor Ls in fig. 2). The power main circuit component can be protected from being damaged by large short-circuit current flowing in the short-circuit process.
The two topological designs can effectively reduce the short-circuit current of the power device in the direct-connection short-circuit process in the module, prevent the power device from losing efficacy in the short-circuit process, effectively improve the reliability of the power device and lay a guarantee foundation for the operation of the power device of the flexible direct-current converter valve. The invention is suitable for the converter valve based on IGCT-MMC.
Claims (10)
1. A direct-current protection circuit of a flexible direct-current IGCT power module is characterized by comprising a power device, a current detection device Isensor, a thyristor SCR, an anode reactor and a direct-current capacitor C;
the two power devices are connected in series, the power devices are connected with a current detection device Isensor, the current detection device Isensor is connected with a direct current capacitor C, an anode reactor Ls is arranged between the direct current capacitor C and the power devices, and a thyristor SCR is connected in parallel at two ends of the direct current capacitor C to form a short-circuit current shunt channel;
the current detection device Isensor is connected with the module control board, and the module control board is connected with the thyristor SCR;
the current detection device Isensor is used for collecting a direct current value of the power device and feeding the current value back to the module control board;
and the module control board is used for controlling the conduction and the closing of the thyristor SCR according to the feedback current value.
2. The dc-link protection circuit of claim 1, wherein the power device comprises an integrated gate commutated thyristor and a fast recovery diode, the integrated gate commutated thyristor and the fast recovery diode being connected in anti-parallel.
3. The direct-current protection circuit of the flexible direct-current IGCT power module as claimed in claim 1, wherein two ends of the anode reactor are respectively connected with a clamping diode Ds and a clamping resistor Rs, the clamping diode Ds and the clamping resistor Rs are both connected with a clamping capacitor Cs, and the clamping capacitor Cs is connected with a current detection device Isensor.
4. The DC-DC protection circuit of claim 1, wherein a voltage divider resistor R is connected in parallel across the DC capacitor C.
5. The DC protection circuit of claim 1, wherein the two ends of the down tube power device are connected to the AC ports, and a bypass switch S is disposed between the AC ports.
6. A direct-current protection circuit of a flexible direct-current IGCT power module is characterized by comprising a power device, a current detection device Isensor, a thyristor SCR, an anode reactor and a direct-current capacitor C;
the two power devices are connected in series, the power devices are connected with a current detection device Isensor, the current detection device Isensor is connected with a direct current capacitor C, an anode reactor Ls is arranged between a thyristor SCR and the direct current capacitor C, and the thyristor SCR is connected in parallel at two ends of the series power devices to form a short-circuit current shunt channel;
the current detection device Isensor is connected with the module control board, and the module control board is connected with the thyristor SCR;
the current detection device Isensor is used for collecting a direct current value of the power device and feeding the current value back to the module control board;
and the module control board is used for controlling the conduction and the closing of the thyristor SCR according to the feedback current value.
7. The pass protection circuit of a flexible-straight IGCT power module according to claim 6, wherein the power device comprises an integrated gate-commutated thyristor and a fast recovery diode, the integrated gate-commutated thyristor and the fast recovery diode being connected in anti-parallel.
8. The direct-current protection circuit of the flexible direct-current IGCT power module as claimed in claim 6, wherein two ends of the anode reactor are respectively connected with a clamping diode Ds and a clamping resistor Rs, the clamping diode Ds and the clamping resistor Rs are both connected with a clamping capacitor Cs, and the clamping capacitor Cs is connected with the current detection device Isensor.
9. The DC-DC protection circuit of claim 6, wherein a voltage divider resistor R is connected in parallel across the DC capacitor C.
10. The DC-DC protection circuit of claim 6, wherein the AC port of the power device is connected in parallel with the two ends of the down tube power device, and a bypass switch S is disposed between the AC ports.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211137764.6A CN115425830A (en) | 2022-09-19 | 2022-09-19 | Straight-through protection circuit of gentle straight IGCT power module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211137764.6A CN115425830A (en) | 2022-09-19 | 2022-09-19 | Straight-through protection circuit of gentle straight IGCT power module |
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| CN115425830A true CN115425830A (en) | 2022-12-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117318458A (en) * | 2023-08-09 | 2023-12-29 | 许继电气股份有限公司 | Bypass device and method for IGCT-MMC power module |
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2022
- 2022-09-19 CN CN202211137764.6A patent/CN115425830A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117318458A (en) * | 2023-08-09 | 2023-12-29 | 许继电气股份有限公司 | Bypass device and method for IGCT-MMC power module |
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