CN203722247U - Main loop for improving DC transmission fault ride-through capability of voltage source converter - Google Patents
Main loop for improving DC transmission fault ride-through capability of voltage source converter Download PDFInfo
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- CN203722247U CN203722247U CN201320846357.2U CN201320846357U CN203722247U CN 203722247 U CN203722247 U CN 203722247U CN 201320846357 U CN201320846357 U CN 201320846357U CN 203722247 U CN203722247 U CN 203722247U
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- 230000005540 biological transmission Effects 0.000 title abstract description 3
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 67
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 66
- 238000006243 chemical reaction Methods 0.000 claims description 45
- 101500023488 Lithobates catesbeianus GnRH-associated peptide 1 Proteins 0.000 claims description 21
- 101500022510 Lithobates catesbeianus GnRH-associated peptide 2 Proteins 0.000 claims description 21
- 238000010521 absorption reaction Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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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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Abstract
The utility model relates to an improve voltage source transverter direct current transmission fault ride through ability's major loop. A receiving end converter station and a transmitting end converter station are arranged between the alternating current receiving end power grid and the wind power plant, and an energy absorption device is connected to the direct current side of the receiving end converter station. The utility model discloses the direct current energy-absorbing loop of receiving end converter station direct current incoming line side disposes the pattern of spark gap and metallic oxide voltage limiter. When the alternating current side of the receiving end power grid has a fault, the energy absorption loop triggers the spark gap to act, the gap is conducted, the direct current voltage is applied to two ends of the metal oxide voltage limiter and exceeds the rated direct current voltage of the metal oxide voltage limiter, the voltage is applied to two ends of the gap spark discharge device and the metal oxide voltage limiter after the metal oxide voltage limiter acts, and meanwhile, the gap spark discharge device controls the discharge current within a reasonable range. The new main loop structure adopts mature equipment elements such as metal oxide voltage limiters, GAPs, GAP spark discharge devices and the like, has high operation reliability, and reduces the manufacturing cost of the direct current energy absorption loop.
Description
Technical field
The utility model is a kind of major loop that improves voltage source converter direct current transportation fault ride-through capacity, belongs to the innovative technology of the major loop that improves voltage source converter direct current transportation fault ride-through capacity.
Background technology
In order to realize sustainable development, utilize the developing direction that has become Future Power System with the renewable energy power generation such as solar energy, wind energy.These generation modes have away from main electrical network, the fluctuation feature such as larger in time.Direct current transportation (voltage source converter HVDC based on voltage source converter, VSC-HVDC) can independently control fast transmitted active power and reactive power, its converter self-commutation, active power and reactive power that can independent regulation current conversion station AC, there is superior controllability and flexibility, become the electric power transfer mode of being potential most that realizes the stable connection between renewable energy power generation and main electrical network.Flexible DC power transmission converter adopt can switch-off power device the voltage source converter of composition, there is not commutation failure situation in Inverter Station, possesses the advantage more more advantageous than conventional direct current transportation.
The outstanding technological merit of voltage source converter direct current transportation, makes it widely apply aspect in access gap performance source etc., and outstanding typical case's application is remote, large-scale offshore wind farm access, widely applies in Europe and North America.Due to the power station of the intermittent energy source such as wind energy turbine set, generally in relatively regional or marine, operation and maintenance difficulty; On the other hand, in order to reduce the impact of start and stop on electrical network, various countries have all proposed requirement to the fault ride-through capacity of connecting system.Current common practices is to adopt voltage source converter direct current transportation access wind-powered electricity generation, at the DC side parallel access energy-absorbing resistance of receiving end current conversion station, being absorbed in receiving end exchanges between outlet age at failure, the power stage that sending end wind energy turbine set is lasting, avoids direct current overvoltage to cause system to be stopped transport, as shown in Figure 1.Energy-absorbing resistance is generally by turn-off device, and the switch forming as insulated gate bipolar transistor IGBT is connected between polar curve.It is large that the high pressure IGBT tandem tap of this structure is realized technical difficulty, and use a large amount of high-power switch devices, and cost is very high.
Utility model content
The purpose of this utility model is to consider the problems referred to above and a kind of safeguards system safety is provided, and improves system operation reliability, obviously saves the major loop of the raising voltage source converter direct current transportation fault ride-through capacity of investment.
The technical solution of the utility model is: the major loop of raising voltage source converter direct current transportation fault ride-through capacity of the present utility model, exchange between receiving end electrical network and wind energy turbine set and be provided with receiving end current conversion station, sending end current conversion station, and receiving end current conversion station DC side access energy absorbing device.
Above-mentioned receiving end current conversion station DC side access includes spark gap, gap spark discharge device, the energy absorbing device of metal oxide pressure-limiting device, or the access of receiving end current conversion station DC side includes the energy absorbing device of spark gap, or between receiving end current conversion station and sending end current conversion station, be only connected with the energy absorbing device of metal oxide pressure-limiting device, or the access of receiving end current conversion station DC side includes the energy absorbing device of the combination of spark gap and gap spark discharge device, or the access of receiving end current conversion station DC side includes the energy absorbing device of the combination of metal oxide pressure-limiting device and gap spark discharge device.
Above-mentioned receiving end current conversion station DC side access includes the energy absorbing device of spark gap L1 and L2, gap spark discharge device GAP1 and GAP2, metal oxide pressure-limiting device MOV1 and metal oxide pressure-limiting device MOV2, and spark gap L1, gap spark discharge device GAP1, metal oxide pressure-limiting device MOV1, metal oxide pressure-limiting device MOV2, gap spark discharge device GAP2, spark gap L2 connect in order.
Above-mentioned receiving end current conversion station DC side access includes the energy absorbing device of spark gap L1 and L2, gap spark discharge device GAP1 and GAP2, metal oxide pressure-limiting device MOV1 and metal oxide pressure-limiting device MOV2, and spark gap L1 and L2, gap spark discharge device GAP1 and GAP2, metal oxide pressure-limiting device MOV1 and metal oxide pressure-limiting device MOV2 connect in any order.
AC network between above-mentioned receiving end current conversion station and sending end current conversion station is 500kV, 330kV, 220kV, 110kV, 66kV, 35kV, 10kV, 6kV.
The utility model adopts the structure at receiving end current conversion station DC side access energy absorbing device, improve voltage source converter and exchange the ride-through capability under outlet failure condition at receiving end current conversion station, ensure that direct current system can keep operation between age at failure, after fault clearance, recover at once normal operation.In addition, energy absorbing device of the present utility model is owing to adopting the structure of spark gap and metal oxide pressure-limiting device MOV, due to spark gap and metal oxide pressure-limiting device MOV technology maturation, action logic is clear, by reasonable disposition device parameter, after can ensureing to drop into by DC voltage control during AC fault at zone of reasonableness, and then ensure that converter and DC side equipment do not produce the overvoltage of harm, safeguards system safety.This structure adopts ripe equipment component, and operational reliability is high, obviously saves investment.The utility model is that a kind of design is ingenious, function admirable, the major loop of convenient and practical raising voltage source converter direct current transportation fault ride-through capacity.
Brief description of the drawings
Fig. 1 is the flexible direct current system wiring schematic diagram that electronic power switch is selected in existing direct current energy-absorbing loop;
Fig. 2 is the flexible direct current system wiring schematic diagram that spark gap and metal oxide pressure-limiting device MOV are selected in the utility model direct current energy-absorbing loop.
Embodiment
Embodiment:
Structural representation of the present utility model is as shown in 2, the major loop of raising voltage source converter direct current transportation fault ride-through capacity of the present utility model, the major loop of raising voltage source converter direct current transportation fault ride-through capacity of the present utility model, exchange between receiving end electrical network and wind energy turbine set and be provided with receiving end current conversion station, sending end current conversion station, and receiving end current conversion station DC side access energy absorbing device.
Above-mentioned receiving end current conversion station DC side access includes spark gap, gap spark discharge device, the energy absorbing device of metal oxide pressure-limiting device, or the access of receiving end current conversion station DC side includes the energy absorbing device of spark gap, or between receiving end current conversion station and sending end current conversion station, be only connected with the energy absorbing device of metal oxide pressure-limiting device, or the access of receiving end current conversion station DC side includes the energy absorbing device of the combination of spark gap and gap spark discharge device, or the access of receiving end current conversion station DC side includes the energy absorbing device of the combination of metal oxide pressure-limiting device MOV and gap spark discharge device.
Above-mentioned receiving end current conversion station DC side access includes the energy absorbing device of spark gap L1 and L2, gap spark discharge device GAP1 and GAP2, metal oxide pressure-limiting device MOV1 and metal oxide pressure-limiting device MOV2, and spark gap L1, gap spark discharge device GAP1, metal oxide pressure-limiting device MOV1, metal oxide pressure-limiting device MOV2, gap spark discharge device GAP2, spark gap L2 connect in order.
Above-mentioned receiving end current conversion station DC side access includes the energy absorbing device of spark gap L1 and L2, gap spark discharge device GAP1 and GAP2, metal oxide pressure-limiting device MOV1 and metal oxide pressure-limiting device MOV2, and spark gap L1 and L2, gap spark discharge device GAP1 and GAP2, metal oxide pressure-limiting device MOV1 and metal oxide pressure-limiting device MOV2 connect in any order.
AC network between above-mentioned receiving end current conversion station and sending end current conversion station is 500kV, 330kV, 220kV, 110kV, 66kV, 35kV, 10kV, 6kV.
The utility model improves the control method of voltage source converter direct current transportation fault ride-through capacity, comprises the steps:
1) detect that exchanging receiving end electrical network is short-circuited after fault, DC voltage overrate, triggered gap spark discharge device GAP1 and GAP2 conducting;
2), after gap spark discharge device GAP1 and GAP2 conducting, direct voltage is applied to metal oxide pressure-limiting device MOV1 and metal oxide pressure-limiting device MOV2 two ends;
3) when gap spark discharge device GAP1 and GAP2 turn-on action, metal oxide pressure-limiting device MOV1 and metal oxide pressure-limiting device MOV2 enter flex point, by heavy-current discharge, absorb DC loop energy, maximum discharge current is limited by gap spark discharge device;
4) after DC loop is discharged by metal oxide pressure-limiting device MOV1 and metal oxide pressure-limiting device MOV2, direct voltage declines, metal oxide pressure-limiting device MOV1 and metal oxide pressure-limiting device MOV2 both end voltage are got back to residual voltage, gap spark discharge device GAP1 and GAP2 stop conducting, and metal oxide pressure-limiting device MOV1 and metal oxide pressure-limiting device MOV2 residual voltage value are higher than direct current rated value;
5) DC side energy-absorbing finishes, and direct voltage is limited in rated value left and right;
6) exchange after the removing of receiving end electric network fault, direct current system is resumed operation.
Above-mentioned steps 1) detect that exchanging receiving end electrical network is short-circuited after fault, DC voltage overrate 1.35pu, triggered gap spark discharge device GAP1 and GAP2 conducting.
Above-mentioned steps 3) metal oxide pressure-limiting device MOV1 and metal oxide pressure-limiting device MOV2 protection voltage is also taken at 1.35pu.
Action logic of the present utility model is as follows:
(1) electrical network normal operation period, energy absorption described in the utility model loop is in high impedance status, and power grid energy is delivered to receiving end current conversion station by sending end current conversion station through DC line, only flows through leakage current in absorption circuit; Normal operation period Real-Time Monitoring exchanges receiving end line voltage and DC line voltage, when detect exchange receiving end electrical network be short-circuited fault and DC line voltage higher than rated value 1.35pu after, gap spark discharge device GAP1 and GAP2 start, by discharging gap conducting;
(2) after igniter starts, within the nanosecond time, GAP1 and GAP2 are by conducting, and after discharging gap conducting, residual voltage is arc resistance voltage, is usually less than 1kV; Now direct voltage is mainly applied to metal oxide pressure-limiting device MOV1 and metal oxide pressure-limiting device MOV2 two ends, metal oxide pressure-limiting device MOV1 and MOV2 protection voltage are taken at 1.35pu left and right, therefore the voltage that metal oxide pressure-limiting device bears exceedes protection voltage operating value, and metal oxide pressure-limiting device MOV1 and MOV2 enter flex point;
(3) after metal oxide pressure-limiting device conducting, MOV1, MOV2, GAP1 and GAP2 are all in low impedance state, DC voltage is mainly applied to metal oxide pressure-limiting device MOV1 and L1(metal oxide pressure-limiting device MOV2 and L2) two ends, the maximum current passing through in loop depends on induction reactance value and metal oxide pressure-limiting device MOV1 and the MOV2 valve block characteristic of L1, L2.The loop that the energy of direct current system forms by spark gap, metal oxide pressure-limiting device MOV1 and MOV2 and gap spark discharge device discharges;
(4) in loop, pass through after electric current, the energy of direct current system is consumed by metal oxide pressure-limiting device MOV1 and MOV2, direct voltage reduces, when the voltage bearing as metal oxide pressure-limiting device MOV1 and MOV2 reaches residual voltage value, metal oxide pressure-limiting device MOV and MOV2 will recover high impedance status, and GAP1 and GAP2 also stop conducting, only pass through Leakage Current in loop, discharge process finishes, and direct current system limiting voltage is in rated value left and right;
(5) exchange receiving end electric network fault and remove, direct current system is resumed operation.
Claims (5)
1. improve a major loop for voltage source converter direct current transportation fault ride-through capacity, it is characterized in that exchanging and between receiving end electrical network and wind energy turbine set, be provided with receiving end current conversion station, sending end current conversion station, and receiving end current conversion station DC side access energy absorbing device.
2. the major loop of raising voltage source converter direct current transportation fault ride-through capacity according to claim 1, it is characterized in that above-mentioned receiving end current conversion station DC side access includes spark gap, gap spark discharge device, the energy absorbing device of metal oxide pressure-limiting device, or the access of receiving end current conversion station DC side includes the energy absorbing device of spark gap, or between receiving end current conversion station and sending end current conversion station, be only connected with the energy absorbing device of metal oxide pressure-limiting device, or the access of receiving end current conversion station DC side includes the energy absorbing device of the combination of spark gap and gap spark discharge device, or the access of receiving end current conversion station DC side includes the energy absorbing device of the combination of metal oxide pressure-limiting device and gap spark discharge device.
3. the major loop of raising voltage source converter direct current transportation fault ride-through capacity according to claim 2, it is characterized in that above-mentioned receiving end current conversion station DC side access includes the energy absorbing device of spark gap L1 and L2, gap spark discharge device GAP1 and GAP2, metal oxide pressure-limiting device MOV1 and metal oxide pressure-limiting device MOV2, spark gap L1, gap spark discharge device GAP1, metal oxide pressure-limiting device MOV1, metal oxide pressure-limiting device MOV2, gap spark discharge device GAP2, spark gap L2 connect in order.
4. the major loop of raising voltage source converter direct current transportation fault ride-through capacity according to claim 2, it is characterized in that above-mentioned receiving end current conversion station DC side access includes the energy absorbing device of spark gap L1 and L2, gap spark discharge device GAP1 and GAP2, metal oxide pressure-limiting device MOV1 and metal oxide pressure-limiting device MOV2, spark gap L1 and L2, gap spark discharge device GAP1 and GAP2, metal oxide pressure-limiting device MOV1 and metal oxide pressure-limiting device MOV2 connect in any order.
5. according to the major loop of the raising voltage source converter direct current transportation fault ride-through capacity described in claim 1 to 4 any one, it is characterized in that the AC network between above-mentioned receiving end current conversion station and sending end current conversion station is 500kV, 330kV, 220kV, 110kV, 66kV, 35kV, 10kV, 6kV.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320846357.2U CN203722247U (en) | 2013-12-20 | 2013-12-20 | Main loop for improving DC transmission fault ride-through capability of voltage source converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320846357.2U CN203722247U (en) | 2013-12-20 | 2013-12-20 | Main loop for improving DC transmission fault ride-through capability of voltage source converter |
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| CN203722247U true CN203722247U (en) | 2014-07-16 |
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| CN201320846357.2U Expired - Lifetime CN203722247U (en) | 2013-12-20 | 2013-12-20 | Main loop for improving DC transmission fault ride-through capability of voltage source converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746399A (en) * | 2013-12-20 | 2014-04-23 | 南方电网科学研究院有限责任公司 | Main loop and method for improving direct-current transmission fault ride-through capability of voltage source converter |
-
2013
- 2013-12-20 CN CN201320846357.2U patent/CN203722247U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746399A (en) * | 2013-12-20 | 2014-04-23 | 南方电网科学研究院有限责任公司 | Main loop and method for improving direct-current transmission fault ride-through capability of voltage source converter |
| CN103746399B (en) * | 2013-12-20 | 2017-02-01 | 南方电网科学研究院有限责任公司 | Main loop and method for improving direct-current transmission fault ride-through capability of voltage source converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: CHINA SOUTHERN POWER GRID CO., LTD. Effective date: 20141226 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20141226 Address after: Guangzhou City, Guangdong province Yuexiu District 510080 Dongfeng East Road, No. 8, 6 water Kong Guangdong building project Patentee after: China South Power Grid International Co.,Ltd. Patentee after: CHINA SOUTHERN POWER GRID Co.,Ltd. Address before: Guangzhou City, Guangdong province Yuexiu District 510080 Dongfeng East Road, No. 8, 6 water Kong Guangdong building project Patentee before: China South Power Grid International Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140716 |