CN103746399A - 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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- CN103746399A CN103746399A CN201310708472.8A CN201310708472A CN103746399A CN 103746399 A CN103746399 A CN 103746399A CN 201310708472 A CN201310708472 A CN 201310708472A CN 103746399 A CN103746399 A CN 103746399A
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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 and method that improves voltage source converter direct current transportation fault ride-through capacity, belongs to and improves the major loop of voltage source converter direct current transportation fault ride-through capacity and the innovative technology of method.
Background technology
In order to realize sustainable development, utilize the developing direction that has become Future Power System with renewable energy power generations such as solar energy, wind energies.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, in Europe and North America, widely applies.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.
Summary of the invention
The object of the invention is to consider the problems referred to above and a kind of safeguards system safety is provided, improving system operation reliability, obviously saving the major loop of the raising voltage source converter direct current transportation fault ride-through capacity of investment.
Another object of the present invention is to provide a kind of control to improve simply and easily the method for voltage source converter direct current transportation fault ride-through capacity.
Technical scheme of the present invention is: the major loop of raising voltage source converter direct current transportation fault ride-through capacity of the present invention, 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 present invention 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.
The present invention 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, guarantee 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 invention 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 guaranteeing 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 present invention is that a kind of design is ingenious, function admirable, major loop and the method for convenient and practical raising voltage source converter direct current transportation fault ride-through capacity.
Accompanying drawing explanation
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 are selected in direct current energy-absorbing of the present invention loop.
Embodiment
Embodiment:
Structural representation of the present invention is as shown in 2, the major loop of raising voltage source converter direct current transportation fault ride-through capacity of the present invention, the major loop of raising voltage source converter direct current transportation fault ride-through capacity of the present invention, 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 MOV, 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 present invention 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 invention is as follows:
(1) electrical network normal operation period, energy absorption of the present invention 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 (8)
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.
6. improve a control method for voltage source converter direct current transportation fault ride-through capacity, it is characterized in that comprising 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.
7. the major loop of raising voltage source converter direct current transportation fault ride-through capacity according to claim 6, it is characterized in that 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.
8. the major loop of raising voltage source converter direct current transportation fault ride-through capacity according to claim 6, is characterized in that 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.
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Cited By (3)
| 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 |
| CN108736511A (en) * | 2018-04-18 | 2018-11-02 | 中国电力科学研究院有限公司 | It is a kind of through the soft wind-powered electricity generation transmitting system fault traversing control method and system directly collected |
| 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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| 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 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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 |
| CN108736511A (en) * | 2018-04-18 | 2018-11-02 | 中国电力科学研究院有限公司 | It is a kind of through the soft wind-powered electricity generation transmitting system fault traversing control method and system directly collected |
| 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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