CN103746399B - Main circuit and method for improving voltage-source transverter DC power-transmission fault ride-through capability - Google Patents
Main circuit and method for improving voltage-source transverter DC power-transmission fault ride-through capability Download PDFInfo
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- CN103746399B CN103746399B CN201310708472.8A CN201310708472A CN103746399B CN 103746399 B CN103746399 B CN 103746399B CN 201310708472 A CN201310708472 A CN 201310708472A CN 103746399 B CN103746399 B CN 103746399B
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- metal oxide
- limiting device
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- oxide pressure
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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]
Abstract
The invention discloses a main circuit and method for improving a voltage-source transverter DC power-transmission fault ride-through capability. A receiving-end convertor station and a sending-end convertor station are arranged between an AC receiving-end power grid and a wind power plant. A DC side of the receiving-end convertor station is connected with an energy-absorption device. A DC energy-absorption circuit at the DC wire inlet side of the receiving-end convertor station is configured into a type of spark gaps and metal-oxide voltage limiters. When a fault occurs to the AC side of the receiving-end power grid, the energy-absorption circuit triggers the spark gaps to act and then the gaps are switched on and DC voltages are applied to the two ends of the metal-oxide voltage limiters and the DC voltages are larger than the rated DC voltage of the metal-oxide voltage limiters. After the metal-oxide voltage limiters act, voltages are applied to the two ends of gap spark discharging devices and the metal-oxide voltage limiters and at the same time, the gap spark discharging devices control discharging current to be within a reasonable range. The new main-circuit structure adopts mature device elements such as the metal-oxide voltage limiters, the GAPs and the gap spark discharging devices and the like and operation reliability is high and cost of the DC energy-absorption circuit is reduced.
Description
Technical field
The present invention is a kind of major loop improving voltage source converter direct current transportation fault ride-through capacity and method, belongs to and carries
The major loop of high voltage source inverter direct current transportation fault ride-through capacity and the innovative technology of method.
Background technology
In order to realize sustainable development, become future electrical energy system using with renewable energy power generations such as solar energy, wind energies
The developing direction of system.These generation modes have away from main electrical network, fluctuate larger in time the features such as.Based on voltage source converter
Direct current transportation (voltage source converter hvdc, vsc-hvdc) can independent quick control transmitted active
Power and reactive power, its inverter self-commutation, it is capable of active power and the reactive power of independent regulation current conversion station AC, tool
There are superior controllability and motility, become and realize being potential most of stable connection between renewable energy power generation and main electrical network
Power transmission mode.Flexible direct-current transmission converter using can switch-off power device composition voltage source converter, Inverter Station
There is not commutation failure situation, possess the advantage more more advantageous than customary DC transmission of electricity.
The prominent technological merit of voltage source converter direct current transportation is so that it in a large number should at aspects such as access gap performance sources
With prominent typical case's application is that remote, large-scale offshore wind farm accesses, and has widely applied in Europe and North America.Due to
The electric station of the intermittent energy source such as wind energy turbine set, is typically in relatively regional or marine, and operation and maintenance is difficult；On the other hand,
In order to reduce the impact to electrical network for the start and stop, various countries all propose requirement to the fault ride-through capacity of access system.Current is general
Way is to access wind-powered electricity generation using voltage source converter direct current transportation, accesses energy-absorbing resistance in the DC side parallel of receiving end current conversion station,
Absorb during receiving end exchange outlet fault, the lasting power output of sending end wind energy turbine set, it is to avoid DC over-voltage leads to system shutdown,
As shown in Figure 1.Energy-absorbing resistance typically passes through turn-off device, and the switch that such as insulated gate bipolar transistor igbt is constituted is connected on pole
Between line.The high pressure igbt tandem tap of this structure realizes technical difficulty greatly, and uses substantial amounts of high-power switch device,
Cost is very high.
Content of the invention
It is an object of the invention to considering the problems referred to above and providing a kind of safeguards system safety, improve system operation reliable
Property hence it is evident that investment reduction raising voltage source converter direct current transportation fault ride-through capacity major loop.
Another object of the present invention is to providing a kind of control simply and easily to improve voltage source converter direct current transportation event
The method of barrier ride-through capability.
The technical scheme is that the master of the raising voltage source converter direct current transportation fault ride-through capacity of the present invention returns
Road, is provided with receiving end current conversion station, sending end current conversion station between exchange receiving end electrical network and wind energy turbine set, and receiving end current conversion station DC side accesses
Energy absorbing device.
Above-mentioned receiving end current conversion station DC side accesses and includes spark gap, gap spark discharge device, metal-oxide limit
The energy absorbing device of depressor, or receiving end current conversion station DC side accesses and includes the energy absorbing device of spark gap, or receiving end
Only it is connected with the energy absorbing device of metal oxide pressure-limiting device between current conversion station and sending end current conversion station, or receiving end current conversion station direct current
Side joint enters to include the energy absorbing device combining of spark gap and gap spark discharge device, or receiving end current conversion station DC side
Access and include metal oxide pressure-limiting device and the energy absorbing device combining of gap spark discharge device.
Above-mentioned receiving end current conversion station DC side access include spark gap l1 and l2, gap spark discharge device gap1 and
The energy absorbing device of 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.
Above-mentioned receiving end current conversion station DC side access include spark gap l1 and l2, gap spark discharge device gap1 and
The energy absorbing device of 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 press arbitrarily suitable
Sequence is connected.
AC network between above-mentioned receiving end current conversion station and sending end current conversion station be 500kv, 330kv, 220kv, 110kv,
66kv、35kv、10kv、6kv.
The present invention improves the control method of voltage source converter direct current transportation fault ride-through capacity, comprises the steps:
1) exchange receiving end electrical network is detected and be short-circuited after fault, DC voltage overrate, then triggered gap fire
Flower electric discharge device gap1 and gap2 conducting；
2), after gap spark discharge device gap1 and gap2 conducting, DC voltage is applied to metal oxide pressure-limiting device mov1
With metal oxide pressure-limiting device mov2 two ends；
3) gap spark discharge device gap1 and while gap2 turn-on action, metal oxide pressure-limiting device mov1 and gold
Belong to oxide voltage limiter mov2 and enter flex point, by heavy-current discharge, absorb DC loop energy, maximum discharge current is by gap
Spark discharge device limits；
4) DC loop is after metal oxide pressure-limiting device mov1 and metal oxide pressure-limiting device mov2 discharge, unidirectional current
Drops, metal oxide pressure-limiting device mov1 and metal oxide pressure-limiting device mov2 both end voltage return to residual voltage, and gap spark is put
Electric installation gap1 and gap2 stops conducting, metal oxide pressure-limiting device mov1 and metal oxide pressure-limiting device mov2 residual voltage value ratio
Dc ratings are high；
5) DC side energy-absorbing terminates, and DC voltage is limited in about rated value；
6), after exchange receiving end electric network fault is removed, straight-flow system is resumed operation.
Above-mentioned steps 1) exchange receiving end electrical network is detected and be short-circuited after fault, DC voltage overrate
1.35pu, then 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 be also taken at
1.35pu.
The present invention, using the structure accessing energy absorbing device in receiving end current conversion station DC side, improves voltage source converter and exists
Receiving end current conversion station exchange outlet failure condition under ride-through capability it is ensured that straight-flow system can remain on during fault,
Recover normal operation at once after fault clearance.Additionally, the energy absorbing device of the present invention is due to using spark gap and metal oxygen
The structure of compound voltage limiter mov, due to spark gap and metal oxide pressure-limiting device mov technology maturation, action logic is clear, leads to
Cross reasonable disposition device parameter, ensure that DC voltage control during AC fault after input in zone of reasonableness, and then
Ensure that inverter and direct current side apparatus do not have the overvoltage of harm, safeguards system safety.This structure is set using ripe
Standby element, operational reliability high hence it is evident that investment reduction.The present invention be a kind of design ingenious, function admirable, convenient and practical raising
The major loop of voltage source converter direct current transportation fault ride-through capacity and method.
Brief description
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 that direct current energy-absorbing loop of the present invention is connect from the flexible direct current system of spark gap and metal oxide pressure-limiting device
Line schematic diagram.
Specific embodiment
Embodiment:
The structural representation of the present invention as indicated with 2, the raising voltage source converter direct current transportation fault traversing energy of the present invention
The major loop of power, the major loop of the raising voltage source converter direct current transportation fault ride-through capacity of the present invention, exchange receiving end electrical network
It is provided with receiving end current conversion station, sending end current conversion station and wind energy turbine set between, and receiving end current conversion station DC side accesses energy absorbing device.
Above-mentioned receiving end current conversion station DC side accesses and includes spark gap, gap spark discharge device, metal-oxide limit
The energy absorbing device of depressor, or receiving end current conversion station DC side accesses and includes the energy absorbing device of spark gap, or receiving end
Only it is connected with the energy absorbing device of metal oxide pressure-limiting device mov between current conversion station and sending end current conversion station, or receiving end current conversion station
DC side accesses and includes spark gap and the energy absorbing device combining of gap spark discharge device, or the receiving end change of current is stood erectly
Stream side joint enters to include the energy absorbing device combining of metal oxide pressure-limiting device and gap spark discharge device.
Above-mentioned receiving end current conversion station DC side access include spark gap l1 and l2, gap spark discharge device gap1 and
The energy absorbing device of 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.
Above-mentioned receiving end current conversion station DC side access include spark gap l1 and l2, gap spark discharge device gap1 and
The energy absorbing device of 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 press arbitrarily suitable
Sequence is connected.
AC network between above-mentioned receiving end current conversion station and sending end current conversion station be 500kv, 330kv, 220kv, 110kv,
66kv、35kv、10kv、6kv.
The present invention improves the control method of voltage source converter direct current transportation fault ride-through capacity, comprises the steps:
1) exchange receiving end electrical network is detected and be short-circuited after fault, DC voltage overrate, then triggered gap fire
Flower electric discharge device gap1 and gap2 conducting；
2), after gap spark discharge device gap1 and gap2 conducting, DC voltage is applied to metal oxide pressure-limiting device mov1
With metal oxide pressure-limiting device mov2 two ends；
3) gap spark discharge device gap1 and while gap2 turn-on action, metal oxide pressure-limiting device mov1 and metal
Oxide voltage limiter mov2 enters flex point, by heavy-current discharge, absorbs DC loop energy, and maximum discharge current is by gap fire
Flower electric discharge device limits；
4) DC loop is after metal oxide pressure-limiting device mov1 and metal oxide pressure-limiting device mov2 discharge, unidirectional current
Drops, metal oxide pressure-limiting device mov1 and metal oxide pressure-limiting device mov2 both end voltage return to residual voltage, and gap spark is put
Electric installation gap1 and gap2 stops conducting, metal oxide pressure-limiting device mov1 and metal oxide pressure-limiting device mov2 residual voltage value ratio
Dc ratings are high；
5) DC side energy-absorbing terminates, and DC voltage is limited in about rated value；
6), after exchange receiving end electric network fault is removed, straight-flow system is resumed operation.
Above-mentioned steps 1) exchange receiving end electrical network is detected and be short-circuited after fault, DC voltage overrate
1.35pu, then 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 be also taken at
1.35pu.
The action logic of the present invention is as follows:
(1) electrical network during normal operation, energy absorption loop of the present invention is in high impedance status, power grid energy by
Sending end current conversion station delivers to receiving end current conversion station through DC line, flows only through leakage current in absorption circuit；During normal operation is real-time
Monitoring exchange receiving end line voltage and AC line voltage, is short-circuited fault and DC line when exchange receiving end electrical network is detected
After voltage is higher than rated value 1.35pu, gap spark discharge device gap1 and gap2 starts, and discharging gap is turned on；
(2) after igniter starts, in nsec, gap1 and gap2 will turn on, and after discharging gap conducting, residual voltage is
Arc resistance voltage, usually less than 1kv；Now DC voltage is mainly applied to metal oxide pressure-limiting device mov1 and metal oxidation
Thing voltage limiter mov2 two ends, metal oxide pressure-limiting device mov1 and mov2 protection voltage is taken at 1.35pu, therefore metal oxygen
The voltage that compound voltage limiter bears exceedes protection voltage operation value, and metal oxide pressure-limiting device mov1 and mov2 enters flex point；
(3), after metal oxide pressure-limiting device conducting, mov1, mov2, gap1 and gap2 are in low impedance state, DC side
Voltage is mainly applied to metal oxide pressure-limiting device mov1 and l1(metal oxide pressure-limiting device mov2 and l2) two ends, logical in loop
The maximum current crossed depends on induction reactance value and metal oxide pressure-limiting device mov1 and the mov2 valve block characteristic of l1, l2.Straight-flow system
Energy released by the loop that spark gap, metal oxide pressure-limiting device mov1 and mov2 and gap spark discharge device are formed
Put；
(4) in loop after electric current, the energy of straight-flow system is consumed by metal oxide pressure-limiting device mov1 and mov2, directly
Stream voltage reduces, when the voltage that metal oxide pressure-limiting device mov1 and mov2 bears reaches residual voltage value, metal-oxide pressure limiting
Device mov and mov2 will recover high impedance status, gap1 and gap2 also stops turning on, and only passes through Leakage Current, discharged in loop
Journey terminates, and straight-flow system voltage is limited in about rated value；
(5) exchange receiving end electric network fault is removed, and straight-flow system is resumed operation.
Claims (3)
1. a kind of control method improving voltage source converter direct current transportation fault ride-through capacity, improves voltage source converter direct current
The major loop of power transmission failure ride-through capability, is provided with receiving end current conversion station, sending end current conversion station between exchange receiving end electrical network and wind energy turbine set,
And receiving end current conversion station DC side accesses energy absorbing device；Above-mentioned receiving end current conversion station DC side access include spark gap l1 and
The energy of l2, gap spark discharge device gap1 and gap2, metal oxide pressure-limiting device mov1 and metal oxide pressure-limiting device mov2
Amount absorption plant, spark gap l1, gap spark discharge device gap1, metal oxide pressure-limiting device mov1, metal-oxide limit
Depressor mov2, gap spark discharge device gap2, spark gap l2 connect in order it is characterised in that improving voltage source converter
The control method of direct current transportation fault ride-through capacity comprises the steps:
1) exchange receiving end electrical network is detected and be short-circuited after fault, DC voltage overrate, then triggered gap spark put
Electric installation gap1 and gap2 turns on；
2), after gap spark discharge device gap1 and gap2 conducting, DC voltage is applied to metal oxide pressure-limiting device mov1 and gold
Belong to oxide voltage limiter mov2 two ends；
3) gap spark discharge device gap1 and while gap2 turn-on action, metal oxide pressure-limiting device mov1 and metal oxidation
Thing voltage limiter mov2 enters flex point, by heavy-current discharge, absorbs DC loop energy, maximum discharge current is put by gap spark
Electric installation limits；
4) DC loop is after metal oxide pressure-limiting device mov1 and metal oxide pressure-limiting device mov2 discharge, under DC voltage
Fall, metal oxide pressure-limiting device mov1 and metal oxide pressure-limiting device mov2 both end voltage return to residual voltage, and gap spark discharge fills
Put gap1 and gap2 and stop conducting, metal oxide pressure-limiting device mov1 and metal oxide pressure-limiting device mov2 residual voltage value compare direct current
Rated value is high；
5) DC side energy-absorbing terminates, and DC voltage is limited in about rated value；
6), after exchange receiving end electric network fault is removed, straight-flow system is resumed operation.
2. the control method improving voltage source converter direct current transportation fault ride-through capacity according to claim 1, it is special
Levy and be above-mentioned steps 1) exchange receiving end electrical network is detected and be short-circuited after fault, DC voltage overrate 1.35pu,
Then triggered gap spark discharge device gap1 and gap2 conducting.
3. the control method improving voltage source converter direct current transportation fault ride-through capacity according to claim 2, it is special
Levy and be above-mentioned steps 3) metal oxide pressure-limiting device mov1 and metal oxide pressure-limiting device mov2 protection voltage be also taken at
1.35pu.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310708472.8A CN103746399B (en) | 2013-12-20 | 2013-12-20 | Main circuit and method for improving voltage-source transverter DC power-transmission fault ride-through capability |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310708472.8A CN103746399B (en) | 2013-12-20 | 2013-12-20 | Main circuit and method for improving voltage-source transverter DC power-transmission fault ride-through capability |
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| Publication Number | Publication Date |
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| CN103746399A CN103746399A (en) | 2014-04-23 |
| CN103746399B true CN103746399B (en) | 2017-02-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109217353A (en) * | 2017-07-06 | 2019-01-15 | 许继集团有限公司 | A kind of the fault traversing control method and system of soft straight power grid and generation of electricity by new energy station |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130057A (en) * | 2016-07-22 | 2016-11-16 | 全球能源互联网研究院 | A kind of possess the DC transmission system stabilizing power swing function |
| CN108736511B (en) * | 2018-04-18 | 2022-08-19 | 中国电力科学研究院有限公司 | Fault ride-through control method and system for soft and straight collected wind power output system |
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| US4219518A (en) * | 1978-05-15 | 1980-08-26 | General Electric Company | Method of improving varistor upturn characteristics |
| CN102484419A (en) * | 2009-08-31 | 2012-05-30 | Abb技术有限公司 | A method and a device for overvoltage protection, and an electric system with such a device |
| CN103181048A (en) * | 2010-10-29 | 2013-06-26 | Abb技术有限公司 | Voltage balancing of symmetric hvdc monopole transmission lines after earth faults |
| CN203722247U (en) * | 2013-12-20 | 2014-07-16 | 南方电网科学研究院有限责任公司 | Major loop for improving DC power transmission fault ride-through capability of voltage source converter |
-
2013
- 2013-12-20 CN CN201310708472.8A patent/CN103746399B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4219518A (en) * | 1978-05-15 | 1980-08-26 | General Electric Company | Method of improving varistor upturn characteristics |
| CN102484419A (en) * | 2009-08-31 | 2012-05-30 | Abb技术有限公司 | A method and a device for overvoltage protection, and an electric system with such a device |
| CN103181048A (en) * | 2010-10-29 | 2013-06-26 | Abb技术有限公司 | Voltage balancing of symmetric hvdc monopole transmission lines after earth faults |
| CN203722247U (en) * | 2013-12-20 | 2014-07-16 | 南方电网科学研究院有限责任公司 | Major loop for improving DC power transmission fault ride-through capability of voltage source converter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109217353A (en) * | 2017-07-06 | 2019-01-15 | 许继集团有限公司 | A kind of the fault traversing control method and system of soft straight power grid and generation of electricity by new energy station |
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| CN103746399A (en) | 2014-04-23 |
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