CN203674715U - Off-stream converter station re-paralleling device in multiterminal flexible DC power transmission system - Google Patents
Off-stream converter station re-paralleling device in multiterminal flexible DC power transmission system Download PDFInfo
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- CN203674715U CN203674715U CN201320830283.3U CN201320830283U CN203674715U CN 203674715 U CN203674715 U CN 203674715U CN 201320830283 U CN201320830283 U CN 201320830283U CN 203674715 U CN203674715 U CN 203674715U
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- 238000006243 chemical reaction Methods 0.000 claims description 85
- 238000002955 isolation Methods 0.000 abstract 4
- 238000005259 measurement Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 15
- 238000005516 engineering process Methods 0.000 description 3
- 208000035126 Facies Diseases 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
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- 101100499229 Mus musculus Dhrsx gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 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 discloses an off-stream converter station re-paralleling device in a multiterminal flexible DC power transmission system; the convertor station employs a modularization multi-level transverter; a DC side comprises one or two pairs of isolation switches; an AC side comprises an AC breaker, an isolation switch, a converter transformer and a charging resistor mutually connected in series; the off-stream converter station refers to the converter station besides two or more converter stations normally working in the multiterminal flexible DC power transmission system, and is not combined in the system; the off-stream converter station re-paralleling device is characterized in that the off-stream converter station network side isolation switch and breaker are closed in sequence, a bypass switch of the off-stream converter station charging resistor is closed, and off-stream converter station DC side isolation switches are closed after the off-stream converter station can stably work, thereby combining the off-stream converter station in the system. The off-stream converter station re-paralleling device can effectively reduce impact current generated by measurement errors when a DC side knife-switch is directly closed, can prevent the whole system from stop running when off-stream stations are in parallel, thereby improving stability and reliability of the multiterminal flexible DC power transmission system.
Description
Technical field
The utility model belongs to multiterminal flexible DC power transmission system control technology field, relates in particular to shut down condition current conversion station parallel device again in flexible DC power transmission system.
Background technology
Multi-terminal HVDC transmission can realize multiple feed and many drop points are subject to electricity, have that current conversion station quantity greatly reduces, current conversion station can individual transmission power, can switch flexibly the advantage of transmission state and high reliability, is to solve regional new-energy grid-connected and the effective method of problem of dissolving.But the control resist technology complexity of MTDC transmission system, service requirement is high, and operational mode is flexible, and being especially incorporated to for the current conversion station of shut down condition in multiterminal flexible DC power transmission system the DC transmission system of normally moving does not also have good method for commissioning.
Stoppage in transit current conversion station is incorporated to operational system at present two kinds of methods: a kind of method needs first operational system to be stopped transport, again by the system restart of whole multiterminal flexible DC power transmission, the method has increased the stoppage in transit probability of multiterminal flexible DC power transmission system, and the important load that can connect system causes heavy losses; Another kind method is by AC system, stoppage in transit current conversion station to be charged, the magnitude of voltage charging by control and the deviation of operational system magnitude of voltage are selected DC circuit breaker closing moment, and the method can produce because of measured deviation the impulse current of breaker closing moment.
For improving multiterminal flexible DC power transmission system reliability of operation and stability, need one can avoid stopping transport current conversion station while being incorporated to operation whole system stop transport, the method for the impulse current that brings of reducing to greatest extent again to close a floodgate.
Utility model content
The purpose of this utility model is to provide the current conversion station parallel device again of stopping transport in multiterminal flexible DC power transmission system, and can avoid stopping transport current conversion station fashionable whole system are stopped transport, the impulse current can reduce to greatest extent closed DC side switch again time.
For achieving the above object, the utility model is achieved through the following technical solutions:
The current conversion station parallel device again of stopping transport in multiterminal flexible DC power transmission system, described multiterminal flexible DC power transmission system comprises more than three or three current conversion station, current conversion station adopts modularization multi-level converter, its DC side comprises one group or two groups of isolating switches, AC comprises the AC circuit breaker of mutual series connection, isolating switch, converter transformer and charging resistor, described charging resistor two ends by-pass switch in parallel, described stoppage in transit current conversion station refers to the current conversion station of the system that is not incorporated to except two or more current conversion stations of normal operation in multiterminal flexible DC power transmission system, it is characterized in that, closed stoppage in transit current conversion station net side isolating switch and circuit breaker successively, the by-pass switch of closed stoppage in transit current conversion station charging resistor, closed stoppage in transit current conversion station DC side isolating switch after the current conversion station stable operation of stopping transport, stoppage in transit current conversion station is incorporated to system.
Described stoppage in transit current conversion station has when multiple, is incorporated to successively as stated above system, in no particular order.
Compared with prior art, the beneficial effects of the utility model are:
(1) the current conversion station parallel device again of stopping transport in the multiterminal flexible DC power transmission system that the utility model provides, when the current conversion station of can effectively avoiding stopping transport in multiterminal flexible DC power transmission system is arranged side by side, whole system need be stopped transport, greatly reduce system stoppage in transit probability, improved the stability of a system and reliability.
(2) the current conversion station parallel device again of stopping transport in the multiterminal flexible DC power transmission system that the utility model provides, is particularly useful for modularization multi-level converter multiterminal flexible DC power transmission system, clear physics conception, simple to operate effectively.
Brief description of the drawings
Fig. 1 is three end flexible DC power transmission systems.
Fig. 2 (a) for locking close a floodgate after the first current flowing figure; Fig. 2 (b) for locking close a floodgate after the second current flowing figure.
Fig. 3 is submodule discharge loop after locking.
Fig. 4 is closed DC side switching sequence figure.
Direct current waveform when Fig. 5 (a) closes DC side switch for the t=0.15s moment after locking; Direct current waveform when Fig. 5 (b) closes DC side switch for the t=0.203s moment after locking; Direct current waveform when Fig. 5 (c) closes DC side switch for the t=0.3s moment after locking; Direct current waveform when Fig. 5 (d) closes DC side switch for the t=0.5s moment after locking; Direct current waveform when Fig. 5 (e) closes DC side switch for the t=0.8s moment after locking.
Fig. 6 is flow chart of the present utility model.
Embodiment
Below in conjunction with the accompanying drawings and the specific embodiments the technical scheme of utility model is elaborated.
Multiterminal flexible DC power transmission system described in the utility model comprises more than three or three current conversion station, wherein at least two current conversion stations normally move, and stoppage in transit current conversion station is the current conversion station of the operational system to be incorporated to except the two or more current conversion stations of normal operation in multiterminal flexible DC power transmission system.Described stoppage in transit current conversion station adopts modularization multi-level converter, its DC side comprises one group or two groups of isolating switches, AC comprises AC circuit breaker, isolating switch, converter transformer and the charging resistor of mutual series connection, described charging resistor two ends by-pass switch in parallel.
The utility model normally moves with two stations in three end flexible DC power transmission systems of employing modularization multi-level converter, and the 3rd station is listed as example again, carries out elaborating of utility model method.As shown in Figure 1, current conversion station 2 and current conversion station 3 form the system of normal operation to three end flexible DC power transmission systems, and its DC voltage is U
dc, current conversion station 1 is the 3rd station to be incorporated to, its DC voltage is U
dc1, DC side electric current is I
dc, each brachium pontis submodule number is n.T1, T2, T3 are respectively the converter transformer of current conversion station 1, current conversion station 2, current conversion station 3, Q1, Q2, Q3 are respectively the AC circuit breaker of current conversion station 1, current conversion station 2, current conversion station 3, QS11 and QS12 are current conversion station 1 AC isolating switch, QS21 and QS22 are current conversion station 2 AC isolating switches, QS31 and QS32 are current conversion station 3 AC isolating switches, QP1, QP2, QP3 are respectively the charging resistor by-pass switch in parallel of current conversion station 1, current conversion station 2, current conversion station 3, and QD1, QD2, QD3 are respectively current conversion station 1, current conversion station 2, current conversion station 3 DC side isolating switches.
In multiterminal flexible DC power transmission system, stop transport current conversion station again paralleling method comprise, as shown in Figure 6:
(1) closed stoppage in transit current conversion station net side isolating switch and circuit breaker successively, the current conversion station that makes to stop transport is by the AC network charging interconnected with it;
(2) by-pass switch of closed stoppage in transit current conversion station charging resistor, selects the release of constant DC voltage control mode;
After controlled charging does not complete, the charging resistor by-pass switch QP1 of closed current conversion station 1, adopts constant DC voltage control and determines Reactive Power Control mode, and release current conversion station 1, runs under STATCOM mode it, and now submodule capacitance voltage reaches rated value.
(3) stoppage in transit current conversion station DC side isolating switch closing time is calculated in locking after the stable operation of stoppage in transit current conversion station simultaneously;
After current conversion station 1 is with the stable operation of STATCOM mode, establishing certain phase 2n sub-module capacitance voltage sum is SumUc (0), and each submodule electric capacity initial voltage is
this current conversion station 1 of locking, capacitor discharge after locking, capacitance voltage reduces, can there be two by possible current path when being reduced to a certain degree more closed DC side isolating switch, SMi(i=1 in Fig. 2 (a), Fig. 2 (b), 2 ... 2n) represent the submodule in facies unit, each submodule is by the half-bridge structure and electric capacity, resistance formation in parallel of two compositions of the IGBT with anti-paralleled diode.After locking, in submodule, IGBT turn-offs, and electric current can only be by circulating with the antiparallel diode of IGBT, for ease of understanding, the IGBT in off state while having omitted locking in Fig. 2.
As shown in Fig. 2 (a), after closed DC side switch, the DC voltage of current conversion station 1 is that 2n capacitance voltage sum of C phase is less than U
dctime, this path has electric current and flows through, and has impulse current when combined floodgate.
As shown in Fig. 2 (b), after closed DC side switch, the DC voltage of current conversion station 1 is 2n capacitance voltage sum and alternating current netting twine instantaneous voltage u
ij(i, j=a, b, c; I's ≠ j) is poor, when this value is less than U
dctime, this path has electric current to flow through, and has impulse current when combined floodgate.And work as u
ij(i, j=a, b, c; When i ≠ j) be alternating current netting twine voltage peak, the most severe impact of closing a floodgate and producing.As long as close a floodgate and do not occur impulse current while meeting alternating voltage peak, can meet alternating voltage instantaneous value and be when arbitrary value closes a floodgate and do not occur impulse current,
U
ijfor alternating current netting twine voltage effective value, SumUc (t) is the sub-module capacitance voltage sum of facies unit 2n after locking.
To sum up, for avoiding the impulse current of closing moment, should ensure to close a floodgate time, capacitance voltage sum meets above-mentioned two conditions simultaneously,
Be that submodule capacitance voltage should meet:
Wherein, u
c(t) be submodule capacitance voltage.
As shown in Figure 3, C is submodule electric capacity in submodule capacitor discharge loop, R be in submodule with the resistance of Capacitance parallel connection.If t=0 when current conversion station locking, after submodule locking, transient process is:
Formula 2 substitution formulas 1 are obtained:
I.e. t after current conversion station 1 locking
0in time, closed DC side switch all can not produce impulse current.
(4) closed stoppage in transit current conversion station DC side isolating switch, stoppage in transit current conversion station is incorporated to system.
As shown in Figure 4, after locking, 2n sub-module capacitance voltage sum is SumUc (0) to closed DC side switching sequence principle, through t
0the electric discharge of time, 2n sub-module capacitance voltage sum SumUc (t) drops to
if instruction time delay and DC side switch motion time sum are T
d, send out DC side switch command time △ t closed, △ t=t
0-T
d, while considering instruction time delay and DC side switch motion time, should be after current conversion station 1 locking △ t=t
0-T
dsend out in time period DC side switch command closed.
The utility model has been built the modular multilevel current conversion station equivalent model of n=6 on PSCAD/EMTDC platform, and the major loop parameter in this model is only the correctness of method described in checking this patent.Current conversion station transformer secondary side line voltage effective value is 166kV, submodule electric capacity is 0.238mF, its parallel resistance is 5k Ω, SumUc (0)=640 ± 6.5kV under this current conversion station model no-load condition, and the system of normal operation replaces with 320kV direct voltage source.Obtain △ t=0.19 ± 0.013s by formula 3.
Ignore instruction time delay and DC side switch motion time, locking when t=4s, Fig. 5 (a), Fig. 5 (b), Fig. 5 (c), Fig. 5 (d), Fig. 5 (e) are respectively DC side current waveform while selecting t=0.15s, t=0.203s, t=0.3s, t=0.5s and t=0.8s to close a floodgate.Easily known by emulation, within 0.203s after locking, can not produce impulse current when closed DC side switch, outside 0.203s after locking, can produce impulse current when closed DC side switch, and the more late impulse current of closing moment is larger, further verify the correctness of the theoretical derivation of the utility model.
The utility model normally moves with two current conversion stations in three end flexible DC power transmissions, and the 3rd current conversion station is listed as example again introduces concrete implementation step and the technological thought of the method, can not limit protection range of the present utility model with this.Any involving after the locking of stoppage in transit current conversion station, selects the method in closed DC side isolating switch moment all to belong to protection range of the present utility model by analyzing transient process.Protection range of the present utility model is as the criterion with the protection range of claim.
Claims (1)
1. the current conversion station parallel device again of stopping transport in multiterminal flexible DC power transmission system, described multiterminal flexible DC power transmission system comprises more than three or three current conversion station, current conversion station adopts modularization multi-level converter, its DC side comprises one group or two groups of isolating switches, AC comprises the AC circuit breaker of mutual series connection, isolating switch, converter transformer and charging resistor, described charging resistor two ends by-pass switch in parallel, described stoppage in transit current conversion station refers to the current conversion station of the system that is not incorporated to except two or more current conversion stations of normal operation in multiterminal flexible DC power transmission system, it is characterized in that, closed stoppage in transit current conversion station net side isolating switch and circuit breaker successively, the by-pass switch of closed stoppage in transit current conversion station charging resistor, closed stoppage in transit current conversion station DC side isolating switch after the current conversion station stable operation of stopping transport, stoppage in transit current conversion station is incorporated to system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320830283.3U CN203674715U (en) | 2013-12-13 | 2013-12-13 | Off-stream converter station re-paralleling device in multiterminal flexible DC power transmission system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320830283.3U CN203674715U (en) | 2013-12-13 | 2013-12-13 | Off-stream converter station re-paralleling device in multiterminal flexible DC power transmission system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333031A (en) * | 2014-11-20 | 2015-02-04 | 国家电网公司 | Convertor station off-stream control method and device thereof for multi-terminal flexible direct current transmission system |
| CN105826953A (en) * | 2015-01-08 | 2016-08-03 | 南京南瑞继保电气有限公司 | Method of enabling flexible DC outage station to enter DC network |
| CN106646145A (en) * | 2016-09-18 | 2017-05-10 | 国网福建省电力有限公司 | Flexible direct current power transmission converter discharge model and discharge time fixed setting method thereof |
| CN112350303A (en) * | 2020-09-09 | 2021-02-09 | 广东电网有限责任公司 | Method and system for quickly switching power supply and computer readable storage medium |
| CN113258599A (en) * | 2021-07-13 | 2021-08-13 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Starting control device and method of multi-terminal direct current transmission system |
-
2013
- 2013-12-13 CN CN201320830283.3U patent/CN203674715U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333031A (en) * | 2014-11-20 | 2015-02-04 | 国家电网公司 | Convertor station off-stream control method and device thereof for multi-terminal flexible direct current transmission system |
| CN105826953A (en) * | 2015-01-08 | 2016-08-03 | 南京南瑞继保电气有限公司 | Method of enabling flexible DC outage station to enter DC network |
| CN105826953B (en) * | 2015-01-08 | 2019-01-08 | 南京南瑞继保电气有限公司 | The method that a kind of flexible direct current stoppage in transit station is incorporated to DC network |
| CN106646145A (en) * | 2016-09-18 | 2017-05-10 | 国网福建省电力有限公司 | Flexible direct current power transmission converter discharge model and discharge time fixed setting method thereof |
| CN112350303A (en) * | 2020-09-09 | 2021-02-09 | 广东电网有限责任公司 | Method and system for quickly switching power supply and computer readable storage medium |
| CN113258599A (en) * | 2021-07-13 | 2021-08-13 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Starting control device and method of multi-terminal direct current transmission system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: No. 108, science and technology road, hi tech Zone, Liaoning, Anshan Patentee after: MONTNETS RONGXIN TECHNOLOGY GROUP CO.,LTD. Patentee after: ELECTRIC POWER Research Institute CHINA SOUTHERN POWER GRID Address before: 114051 Anshan high tech Zone, Liaoning province science and technology road, No. 108 Patentee before: RONGXIN POWER ELECTRONIC Co.,Ltd. Patentee before: ELECTRIC POWER Research Institute CHINA SOUTHERN POWER GRID |
|
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: RONGXIN HUIKO ELECTRIC TECHNOLOGY Co.,Ltd. Assignor: MONTNETS RONGXIN TECHNOLOGY GROUP CO.,LTD. Contract record no.: 2017210000040 Denomination of utility model: Off-stream converter station re-paralleling device in multiterminal flexible DC power transmission system Granted publication date: 20140625 License type: Common License Record date: 20171212 |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200214 Address after: 114000 Anshan province Liaoning City Tiedong Mountain Road No. 212 Co-patentee after: ELECTRIC POWER Research Institute CHINA SOUTHERN POWER GRID Patentee after: RONGXIN HUIKO ELECTRIC TECHNOLOGY Co.,Ltd. Address before: 108 Keji Road, high tech Zone, Anshan City, Liaoning Province Co-patentee before: ELECTRIC POWER Research Institute CHINA SOUTHERN POWER GRID Patentee before: MONTNETS RONGXIN TECHNOLOGY GROUP CO.,LTD. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 114000 212 Yue Ling Road, Anshan, Liaoning Patentee after: Rongxin Huike Electric Co.,Ltd. Patentee after: ELECTRIC POWER Research Institute CHINA SOUTHERN POWER GRID Address before: 114000 212 Yue Ling Road, Anshan, Liaoning Patentee before: RONGXIN HUIKO ELECTRIC TECHNOLOGY Co.,Ltd. Patentee before: ELECTRIC POWER Research Institute CHINA SOUTHERN POWER GRID |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140625 |