CN205610230U - A parallelly connected defence and prosthetic devices for direct current transmission commutation failure trouble - Google Patents
A parallelly connected defence and prosthetic devices for direct current transmission commutation failure trouble Download PDFInfo
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- CN205610230U CN205610230U CN201620148961.1U CN201620148961U CN205610230U CN 205610230 U CN205610230 U CN 205610230U CN 201620148961 U CN201620148961 U CN 201620148961U CN 205610230 U CN205610230 U CN 205610230U
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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
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- 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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Abstract
The utility model provides a parallelly connected defence and prosthetic devices for direct current transmission commutation failure trouble, device connect in parallel on the direct current transmission circuit that is close to contravariant side transverter, and the device is including controllable switching unit and resistance power consumption return circuit, the once side of controllable switching unit with contravariant side transverter once inclines the direct current transmission line connection, the secondary side of controllable switching unit with the once side in resistance power consumption return circuit is connected, the secondary side in resistance power consumption return circuit with contravariant side transverter secondary side the direct current transmission line connection. The device can consume dc power fast, reduces and send the end alternating -current system surplus power, in the system recovery stage, avoided the contravariant side to break down once more, promote system recovery speed, effectively solved the parallelly connected defence and the restoration problem of direct current transmission commutation failure trouble, improved the security and the stability of the operation of direct current transmission system.
Description
Technical field
This utility model relates to direct current transportation dc power bypass technology field, is specifically related to a kind of defence in parallel for direct current transportation commutation failure fault and prosthetic device.
Background technology
Along with " transferring electricity from the west to the east " strategy is progressively implemented, extra-high voltage direct-current transmission engineering is concentrated and is put into operation, and China has become capacity, the country of largest AC-DC hybrid power grid in the world.Ultra-high DC single returns the continuous lifting of transmission capacity, " tetanic weak friendship " feature is manifested, it is mainly reflected in: one is that receiving end electrical network mostly is load center, multi-infeed DC drop point is concentrated, between each Inverter Station, electrical distance is relatively near, and current conversion station near region fault in ac transmission system may cause multiple-circuit line that commutation failure occurs simultaneously；Two be sending end electrical network be energy concentrated area, AC system contact is relatively weak, if inverter side commutation failure causes dc power conveying to occur temporarily and interrupts, the important section of sending end grid parts will be caused to exceed stability limit, part fired power generating unit hypervelocity, Wind turbines because of low pressure or the extensive off-grid of high pressure, serious threat security of system stable operation.
Not yet there is the equipment that can quickly and efficiently solve commutation failure fault in DC transmission system at present, therefore, how to design a kind of equipment being simultaneously used for commutation failure fault in defence in parallel and reparation DC transmission system, be this area problem demanding prompt solution.
Utility model content
In view of this, a kind of defence in parallel for direct current transportation commutation failure fault that this utility model provides and prosthetic device, this device achieves at the forecast period of the faults such as commutation failure and quickly reduces DC current, and significantly fall reduces failure occurrence probability mutually；Upon a fault, this device can quickly consume dc power, reduces sending end AC system excess power；In the system recovery stage, the device avoids inverter side and again break down, promote system recovery speed, efficiently solve defence in parallel and the reparation problem of direct current transportation commutation failure fault, improve safety and stability that DC transmission system runs.
The purpose of this utility model is achieved through the following technical solutions:
A kind of defence in parallel for direct current transportation commutation failure fault and prosthetic device, it is characterized in that, described defence in parallel and prosthetic device are connected in parallel on the DC power transmission line of inverter side inverter, and described defence in parallel and prosthetic device include controlled switching unit and resistance power consumption loop；
The primary side of described controlled switching unit is connected with the described DC power transmission line of described inverter side inverter primary side；
The secondary side of described controlled switching unit is connected with the primary side in described resistance power consumption loop；
The secondary side in described resistance power consumption loop is connected with the described DC power transmission line of described inverter side inverter secondary side.
Preferably, described controlled switching unit is IGCT string, and described IGCT string includes the IGCT of multiple series connection；
The primary side of described IGCT string is connected with the described DC power transmission line of described inverter side inverter primary side；
The secondary side of described IGCT string is connected with the primary side in described resistance power consumption loop.
Preferably, described controlled switching unit is IGBT group string, and described IGBT group string includes the IGBT of multiple series connection；
The primary side of described IGBT group string is connected with the described DC power transmission line of described inverter side inverter primary side；
The secondary side of described IGBT group string is connected with the primary side in described resistance power consumption loop.
Preferably, described controlled switching unit is IGCT group string, and described IGCT group string includes the IGCT of multiple series connection；
The primary side of described IGCT group string is connected with the described DC power transmission line of described inverter side inverter primary side；
The secondary side of described IGCT group string is connected with the primary side in described resistance power consumption loop.
Preferably, described IGCT includes housing, the IGCT body that is arranged in described housing and controlled switch unit, and described controlled switch unit is connected with described IGCT body；
Described housing includes conductive cover plate, lower conductive cover plate and is folded in the connection dead ring between conductive cover plate and lower conductive cover plate.
Preferably, being respectively equipped with conductive shield between described IGCT body and described upper conductive cover plate and lower conductive cover plate, described conductive shield includes two-layer conductive plate and is arranged on the insulation board between two-layer conductive plate.
Preferably, described IGCT body is provided with cushion pad with described connection between dead ring, and described cushion pad is cellular cushion pad；
The outer wall of described connection dead ring is provided with equally distributed air-vent, and described air-vent is provided with Air Filter.
Can be seen that from above-mentioned technical scheme, this utility model provides a kind of defence in parallel for direct current transportation commutation failure fault and prosthetic device, device is connected in parallel on the DC power transmission line of inverter side inverter, and device includes controlled switching unit and resistance power consumption loop；The primary side of controlled switching unit is connected with the described DC power transmission line of described inverter side inverter primary side；The secondary side of controlled switching unit is connected with the primary side in described resistance power consumption loop；The secondary side in resistance power consumption loop is connected with the described DC power transmission line of described inverter side inverter secondary side.This device can quickly consume dc power, reduces sending end AC system excess power；In the system recovery stage, it is to avoid inverter side breaks down again, promote system recovery speed, efficiently solve defence in parallel and the reparation problem of direct current transportation commutation failure fault, improve safety and stability that DC transmission system runs.
With immediate prior art ratio, the technical scheme that this utility model provides has a following excellent effect:
1, in technical scheme provided by the utility model, defence in parallel and prosthetic device include controlled switching unit and resistance power consumption loop；This device topological structure is simple, controls easily, and engineering adaptability is strong, efficiently solves defence in parallel and the reparation problem of direct current transportation commutation failure fault.
2, technical scheme provided by the utility model, defence installation reduces DC current when commutation failure is predicted, reduces inverter side and closes the angle of rupture, probability that commutation failure occur is greatly reduced.
3, technical scheme provided by the utility model, defence installation, at the power of inverter side generation commutation failure post consumption sending end surplus, is substantially improved sending transient stability.
4, technical scheme provided by the utility model, defence installation reduces inverter side and the probability of commutation failure occurs again when commutation failure recovers, and improves system recovery speed.
5, technical scheme provided by the utility model, defence in parallel and prosthetic device achieve at the forecast period of the faults such as commutation failure and quickly reduce DC current, and significantly fall reduces failure occurrence probability mutually；Upon a fault, it is possible to quickly consume dc power, sending end AC system excess power is reduced；In the system recovery stage, it is to avoid inverter side breaks down again, promote system recovery speed, efficiently solve defence in parallel and the reparation problem of direct current transportation commutation failure fault, improve safety and stability that DC transmission system runs.
6, the technical scheme that this utility model provides, is widely used, has significant Social benefit and economic benefit.
Accompanying drawing explanation
Fig. 1 is a kind of defence in parallel for direct current transportation commutation failure fault of the present utility model and the structural representation of prosthetic device；
Fig. 2 is the structural representation that controlled switching unit is IGCT string in defence in parallel of the present utility model and prosthetic device；
Fig. 3 is the structural representation that controlled switching unit is IGBT string in defence in parallel of the present utility model and prosthetic device；
Fig. 4 is the structural representation of the IGCT in defence in parallel of the present utility model and prosthetic device.
1-parallel connection defence and prosthetic device；2-inverter side inverter；3-DC power transmission line；4-controlled switching unit；5-resistance power consumption loop；6-IGCT；7-IGBT；8-housing；9-IGCT body；10-controlled switch unit；The upper conductive cover plate of 801-；Conductive cover plate under 802-；803-connects dead ring；11-conductive plate；12-insulation board；13-cushion pad；14-air-vent；15-Air Filter.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of this utility model rather than whole embodiments.Based on embodiment of the present utility model, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of this utility model protection.
As shown in Figure 1, this utility model provides a kind of defence in parallel for direct current transportation commutation failure fault and prosthetic device, defence in parallel and prosthetic device 1 are connected in parallel on the DC power transmission line 3 of inverter side inverter 2, and defence in parallel and prosthetic device 1 include controlled switching unit 4 and resistance power consumption loop 5；
The primary side of controlled switching unit 4 is connected with the DC power transmission line 3 of inverter side inverter 2 primary side；
The secondary side of controlled switching unit 4 is connected with the primary side in resistance power consumption loop 5；
The secondary side in resistance power consumption loop 5 is connected with the DC power transmission line 3 of inverter side inverter 2 secondary side.
As in figure 2 it is shown, controlled switching unit 4 is IGCT string, IGCT string includes the IGCT 6 of multiple series connection；
The primary side of IGCT string is connected with the DC power transmission line 3 of inverter side inverter 2 primary side；
The secondary side of IGCT string is connected with the primary side in resistance power consumption loop 5.
As it is shown on figure 3, controlled switching unit 4 is gone here and there for IGBT group, IGBT group string includes the IGBT 7 of multiple series connection；
The primary side of IGBT group string is connected with the DC power transmission line 3 of inverter side inverter 2 primary side；
The secondary side of IGBT group string is connected with the primary side in resistance power consumption loop 5.
Controlled switching unit in Fig. 3 can also be gone here and there for IGCT group, and IGCT group string includes the IGCT of multiple series connection；
The primary side of IGCT group string is connected with the described DC power transmission line of described inverter side inverter primary side；
The secondary side of IGCT group string is connected with the primary side in described resistance power consumption loop.
It addition, in the switching unit of the present invention in addition to thyristor groups string, IGBT group string and IGCT group string, other also can be used to possess the power electronic devices of switch attribute.
As shown in Figure 4, IGCT 6 includes housing 8, the IGCT body 9 that is arranged in housing 8 and controlled switch unit 10, and controlled switch unit 10 is connected with IGCT body 9；
Housing 8 includes conductive cover plate 801, lower conductive cover plate 802 and is folded in the connection dead ring 803 between conductive cover plate 801 and lower conductive cover plate 802.
Wherein, being respectively equipped with conductive shield between IGCT body 9 and upper conductive cover plate 801 and lower conductive cover plate 802, conductive shield includes two-layer conductive plate 11 and the insulation board 12 being arranged between two-layer conductive plate 11；
IGCT body 9 is provided with cushion pad 13 with being connected between dead ring 803, and cushion pad 13 is cellular cushion pad；
The outer wall connecting dead ring 803 is provided with equally distributed air-vent 14, and air-vent 14 is provided with Air Filter 15.
This utility model provides a kind of defence in parallel utilizing direct current transportation commutation failure fault and prosthetic device that direct current transportation commutation failure fault carries out defence in parallel and the method repaired, and comprises the steps:
Step 1: monitor in real time and judge whether the converter valve of transmission line of electricity rectification side breaks down；
The most then there is, on prediction DC power transmission line, the probability that commutation failure occurs；Enter step 2；
If it is not, then continue monitoring converter valve；
The commutation failure of DC power transmission line is on the defensive by step 2., and whether the duty of detection converter valve recovers normal；
The most then enter step 3；
If it is not, then judge the fault of DC power transmission line generation commutation failure, enter step 4；
Step 3. recovers the power transmission of original DC power transmission line；
The commutation failure fault that step 4. controls and repairs on DC power transmission line so that DC power transmission line recovers normal operating condition.
I.e. at the forecast period of the faults such as commutation failure; after level of standing Control protection system monitors fault; send a signal; converter valve predict it may happen that commutation failure or other faults constantly; by controlling the controlled member such as IGCT, IGBT, shunt circuit is put in inverter side DC line; reduce the DC current that inverter side converter valve flows into, reduce angle of overlap, reduce commutation failure probability of happening.
After converter valve duty returns to normally, by controlling the controlled member such as IGCT, IGBT, shunt circuit is excised from DC line, recover the transmission of original DC line power.
And at commutation failure Restoration stage, first rectification side converter valve is resumed operation, shunt circuit is put in inverter side DC line by the controlled members such as its secondary control IGCT, IGBT, then inverter side converter valve is resumed operation, after inverter side converter valve stable operation, control the controlled member such as IGCT, IGBT to be excised from DC line shunt circuit, recover straight-flow system normal operating condition.
Wherein, also include before step 1:
Parallel connection defence and prosthetic device being arranged in parallel on the DC power transmission line of inverter side inverter, wherein, defence in parallel and prosthetic device include controlled switching unit and resistance power consumption loop；
Controlled switching unit is IGCT or IGBT.
Wherein, step 2 includes:
2-1. controls IGCT or the shunt circuit of parallel connection defence and prosthetic device place is put in inverter side DC power transmission line by IGBT, puts into the shunt circuit after inverter side DC power transmission line and reduces the DC current of inverter side converter valve inflow, reduce angle of overlap and reduce commutation failure probability of happening；
Whether the duty of 2-2. detection converter valve recovers normal；
The most then enter step 3；
If it is not, then judge the fault of DC power transmission line generation commutation failure, enter step 4.
Wherein, step 3 includes:
Control IGCT or the shunt circuit at parallel connection defence and prosthetic device place is excised from inverter side DC power transmission line by IGBT, recover the power transmission of original DC power transmission line.
Wherein, step 4 includes:
4-1. controls the converter valve of transmission line of electricity rectification side and resumes operation；
4-2. controls IGCT or the shunt circuit of parallel connection defence and prosthetic device place is put in inverter side DC power transmission line by IGBT；
4-3. controls inverter side converter valve and resumes operation；
4-4. controls IGCT or IGBT and excise from inverter side DC power transmission line the shunt circuit at parallel connection defence and prosthetic device place so that DC power transmission line recovery normal operating condition, completes the reparation of commutation failure fault on DC power transmission line.
Above example is only in order to illustrate that the technical solution of the utility model is not intended to limit; although this utility model being described in detail with reference to above-described embodiment; detailed description of the invention of the present utility model still can be modified or equivalent by those of ordinary skill in the field; and these are without departing from any amendment of this utility model spirit and scope or equivalent, it is all within the claims of the present utility model that application is awaited the reply.
Claims (7)
1. the defence in parallel for direct current transportation commutation failure fault and prosthetic device, it is characterized in that, described defence in parallel and prosthetic device are connected in parallel on the DC power transmission line of inverter side inverter, and described defence in parallel and prosthetic device include controlled switching unit and resistance power consumption loop；
The primary side of described controlled switching unit is connected with the described DC power transmission line of described inverter side inverter primary side；
The secondary side of described controlled switching unit is connected with the primary side in described resistance power consumption loop；
The secondary side in described resistance power consumption loop is connected with the described DC power transmission line of described inverter side inverter secondary side.
2. device as claimed in claim 1, it is characterised in that described controlled switching unit is IGCT string, and described IGCT string includes the IGCT of multiple series connection；
The primary side of described IGCT string is connected with the described DC power transmission line of described inverter side inverter primary side；
The secondary side of described IGCT string is connected with the primary side in described resistance power consumption loop.
3. device as claimed in claim 1, it is characterised in that described controlled switching unit is IGBT group string, described IGBT group string includes the IGBT of multiple series connection；
The primary side of described IGBT group string is connected with the described DC power transmission line of described inverter side inverter primary side；
The secondary side of described IGBT group string is connected with the primary side in described resistance power consumption loop.
4. device as claimed in claim 1, it is characterised in that described controlled switching unit is IGCT group string, described IGCT group string includes the IGCT of multiple series connection；
The primary side of described IGCT group string is connected with the described DC power transmission line of described inverter side inverter primary side；
The secondary side of described IGCT group string is connected with the primary side in described resistance power consumption loop.
5. device as claimed in claim 2, it is characterised in that described IGCT includes housing, the IGCT body that is arranged in described housing and controlled switch unit, and described controlled switch unit is connected with described IGCT body；
Described housing includes conductive cover plate, lower conductive cover plate and is folded in the connection dead ring between conductive cover plate and lower conductive cover plate.
6. device as claimed in claim 5, it is characterised in that being respectively equipped with conductive shield between described IGCT body and described upper conductive cover plate and lower conductive cover plate, described conductive shield includes two-layer conductive plate and is arranged on the insulation board between two-layer conductive plate.
7. the device as described in claim 5 or 6, it is characterised in that described IGCT body is provided with cushion pad with described connection between dead ring, and described cushion pad is cellular cushion pad；
The outer wall of described connection dead ring is provided with equally distributed air-vent, and described air-vent is provided with Air Filter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620148961.1U CN205610230U (en) | 2016-02-29 | 2016-02-29 | A parallelly connected defence and prosthetic devices for direct current transmission commutation failure trouble |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620148961.1U CN205610230U (en) | 2016-02-29 | 2016-02-29 | A parallelly connected defence and prosthetic devices for direct current transmission commutation failure trouble |
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| CN205610230U true CN205610230U (en) | 2016-09-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105743115A (en) * | 2016-02-29 | 2016-07-06 | 全球能源互联网研究院 | Parallel defense and repair device and method for commutation failure fault of DC power transmission |
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- 2016-02-29 CN CN201620148961.1U patent/CN205610230U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105743115A (en) * | 2016-02-29 | 2016-07-06 | 全球能源互联网研究院 | Parallel defense and repair device and method for commutation failure fault of DC power transmission |
| CN105743115B (en) * | 2016-02-29 | 2024-03-22 | 全球能源互联网研究院 | Parallel connection defense and repair device and method for commutation failure fault of direct-current transmission |
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