CN103647300B - Extra-high voltage direct-current transmission engineering inverter puts into and withdrawal control method online - Google Patents
Extra-high voltage direct-current transmission engineering inverter puts into and withdrawal control method online Download PDFInfo
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- CN103647300B CN103647300B CN201310690419.XA CN201310690419A CN103647300B CN 103647300 B CN103647300 B CN 103647300B CN 201310690419 A CN201310690419 A CN 201310690419A CN 103647300 B CN103647300 B CN 103647300B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000005540 biological transmission Effects 0.000 title claims abstract description 10
- 238000002955 isolation Methods 0.000 claims description 21
- VKRWRNVGVPSVLA-UHFFFAOYSA-N n,n'-bis(2-phenylphenyl)oxamide Chemical compound C=1C=CC=C(C=2C=CC=CC=2)C=1NC(=O)C(=O)NC1=CC=CC=C1C1=CC=CC=C1 VKRWRNVGVPSVLA-UHFFFAOYSA-N 0.000 claims description 6
- 238000012546 transfer Methods 0.000 abstract description 5
- 230000001052 transient effect Effects 0.000 abstract description 3
- 238000012216 screening Methods 0.000 abstract description 2
- 230000010363 phase shift Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001684 chronic effect Effects 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/75—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/757—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/7575—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only for high voltage direct transmission link
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The present invention relates to extra-high voltage direct-current transmission engineering inverter to put into online and withdrawal control method, by the trigger angle control of SCA screening electrode layer, export the Trigger Angle oneself calculated, making valve group both end voltage is zero; Utilize pi regulator follow-up type valve group electric current simultaneously, after electric current in bypass chopper BPS drops to and cut-offs capacity, pull open, complete the online input process of valve group. In exiting process, limited by the Trigger Angle that current control amplifier is exported, then throw bypass to, locking, complete the transfer of DC current, it is achieved exiting online of valve group. The present invention throws and moves back ratio faster, and the transient state (overvoltage, overcurrent) in start-up course is smaller, and the reactive power impact of AC system is little, and throws that to move back voltage in process, electric current, meritorious, idle change procedure more smooth, controls logic fairly simple.
Description
Technical field
The present invention relates to a kind of extra-high voltage direct-current transmission engineering inverter throwing and move back strategy.
Background technology
Fig. 1 is existing ± 800kv extra-high voltage direct-current transmission engineering inverter bipolar mode of connection of series connection, every extremely can 2 inverter series operations, also can single inverter independent operating, and under the running status of pole put into or exit certain inverter and do not affect the properly functioning of another inverter of homopolarity.
At present, domestic extra-high voltage direct-current transmission engineering all adopts the mode of connection of double, two 12 flutter valve group series connection, there is the multiple method of operation, therefore research single converter is needed to throw/move back strategy online, and existing inverter is thrown and is moved back the chronic of strategy, it is more complicated that boot sequence controls logic, the reactive power support of system is required significantly high, during input even higher at 2 times that the reactive power consumption of rectification side and inverter side straight-flow system is normal entire run mode, for the extra-high voltage DC transmission system being vigorously developed, ratio is not faster, the reactive power impact of AC system is little, strategy is moved back in the inverter throwing controlling logic fairly simple, the requirement of technical development can not be met.
Summary of the invention
For overcoming above-mentioned the deficiencies in the prior art, the invention provides a kind of new inverter to put into and the control method exited, for solve existing control mode throw move back time length, the reactive power impact of AC system is big, control the problem that logic is more complicated, make the transient state in start-up course (overvoltage, overcurrent) minimize, make active power and reactive power have a smooth change procedure simultaneously.
The online input control method of extra-high voltage direct-current transmission engineering inverter, step is as follows:
1), pole control layer issues valve group and puts into order, and Trigger Angle turns to be taken over by SCA, by phase shift order, makes Trigger Angle be set to 164 °;
2), valve group unlocks, and close bypass chopper and isolation switch, disconnects bypass isolation switch, valve group and bypass chopper parallel shunt. Meanwhile, phase shift order disappears, and SCA module utilizes pi regulator to follow the tracks of the difference of bridge arm current and neutral circuit electric current, exports Trigger Angle;
3), when | bridge arm current-neutral circuit electric current |≤0.015(now inverter Trigger Angle is equal to the SCA angle calculated) time, it is allowed to opening BPS order and produce, SCA keeps Trigger Angle constant, waits that bypass chopper is opened;
4), after bypass chopper is opened, if | bridge arm current-neutral circuit electric current |≤0.1, Trigger Angle is taken over by the current control amplifier of pole key-course again, and CV_IFO module sends the order that puts into operation, and the inverter of input enters fully operational status.
When the absolute value of bridge arm current Yu line current difference reaches setting value, after time delay, it is allowed to open bypass chopper.
The online withdrawal control method of extra-high voltage direct-current transmission engineering inverter, step is as follows:
1) Trigger Angle by current control amplifier is exported limits, and order Inverter Station station converter valve CV1 Trigger Angle drops to 90 degree with certain slope, and now valve group voltage is close to 0;
2) put into Inverter Station to bypass (BPPO), provide a current channel for DC current;
3) Guan Bi Inverter Station bypass chopper BPS, electric current is transferred in BPS;
4) locking Inverter Station converter valve, when current over-zero, converter valve stops conducting;
5) Guan Bi bypass isolation switch BPI, pulls open BPS, opens isolation switch AI, CI, thus isolating converter valve CV1, DC current is transferred to bypass and kept apart the Central Shanxi Plain;
6) Trigger Angle by current control amplifier is exported limits, and order converting plant converter valve CV1 Trigger Angle rises to 90 degree with certain slope, and now valve group voltage is close to 0;
7) put into Inverter Station to bypass (BPPO), provide a current channel for DC current;
8) Guan Bi Inverter Station bypass chopper BPS, electric current is transferred in BPS;
9) locking Inverter Station converter valve, when current over-zero, converter valve stops conducting;
10) Guan Bi bypass isolation switch BPI, pulls open BPS, opens isolation switch AI, CI, thus isolating inverter, DC current is transferred to bypass and kept apart the Central Shanxi Plain.
The present invention is started by valve control layer SCA(and controls amplifier) trigger angle control of screening electrode layer, export the Trigger Angle oneself calculated, making valve group both end voltage is zero; Utilize pi regulator follow-up type valve group electric current simultaneously, after electric current in bypass chopper BPS drops to and cut-offs capacity, pull open, complete the online input process of valve group. In exiting process, it is limited by the Trigger Angle that current control amplifier is exported, then throws bypass to, locking, complete the transfer of DC current, it is achieved exiting online of valve group.
The invention has the beneficial effects as follows: throw and move back ratio faster, transient state (overvoltage, overcurrent) in start-up course is smaller, the reactive power impact of AC system is little, and throw that to move back voltage in process, electric current, meritorious, idle change procedure more smooth, control logic fairly simple.
Accompanying drawing explanation
Fig. 1 is the bipolar operation wiring figure that connects;
Fig. 2 is Trigger Angle computing module SCA port map;
Fig. 3 starts module CV_START and puts into the port map of module CV_IFO;
Fig. 4 is inverter Triggering Control System block diagram;
Fig. 5 is SCA module control logic figure.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
First the prior art means relevant to converter valve control related in following description are carried out simple illustration. SCA, startup control amplifier, CV_START, valve group startup module, and CV_IFO, valve group put into module, their port and connection figure as shown in Figure 2,3, and all there are manufacture in the electric manufacturers such as these modules broadly fall into existing product, ABB.
In fig. 2, port id IFF_SCA represents the difference of the bridge arm current of converter valve to be put into and the neutral circuit electric current Differential Input as SCA; O_START_SCA is that SCA starts order; O_RETARD_SCA is SCA phase shift order; ALPHA_ORD_POLE is the Trigger Angle that pole power key-course is sent here; ALPHA_ORD_SCA output is the SCA Trigger Angle calculated; ALPHA_ORD is the Trigger Angle being input to converter valve.
In the diagram, MC is master controller; VDCOL is current limiting low-voltage device; CCA is current control amplifier; CFC is trigger controller; CPG controls pulse generator; CMU is current measuring unit; IO_FR_PPC is the current-order that pole power controls output; △ Io is current margin compensation value; IORD is final current-order; FIR_TIME is the interval of two continuous trigger pulses; CP triggers pulse.
As it is shown in figure 1, for two inverters of every pole, put into and in the explanation exiting process, all moving back CV1 for throwing. The online premise put into is that CV2 has been put into steady-state operation, and its principle followed is: first puts into converting plant, puts into Inverter Station afterwards.
The process that rectification or Inverter Station put into CV1 online is as follows:
1) CV_START module receives after the startup order of pole key-course, assigns O_START_SCA order, and Trigger Angle is taken over by SCA.
2) O_RETARD_SCA order produces, and makes SCA Trigger Angle instruction ALPHA_ORD_SCA=164 ° exported by maximum amplitude limit.
When O_START_SCA order puts 1, SCA adapter trigger angle control, by phase shift order, make ALPHA_ORD_SCA be set to 164 °; When O_START_SCA order sets to 0, pole control layer CCA adapter trigger angle control. O_START_SCA puts the condition of 1: pole control layer is assigned valve group and put into order; The condition that O_START_SCA sets to 0: BPS disconnects, and | IDFF_SCA |≤0.1.
3) valve group unlocks, and close bypass chopper and isolation switch, disconnects bypass isolation switch, and CV1 and BPS parallel shunt, O_RETARD_SCA sets to 0. SCA module is under the effect of a pi regulator (input error signal is the IDIFF_SCA=bridge arm current-neutral circuit electric current flowing through CV1, is equivalent to flow through the electric current of BPS) afterwards, and the Trigger Angle of CV1 drops to certain value of 80 °～105 ° from 164 degree; Control logic about pi regulator and SCA, see Fig. 5.
Before valve group unlocks, electric current forms path by bypassing isolation switch; After valve group unlocks, close bypass chopper and isolation switch, disconnects bypass isolation switch, CV1 and BPS parallel shunt.
4) when | IDIFF_SCA |≤0.015, and after reaching 20ms, the electric current flowing through BPS can produce zero crossing, it is allowed to opens BPS order and produces. Now CV1 Trigger Angle is equal to the SCA Trigger Angle (probably at about 85 degree, Inverter Station is probably at about 90 degree in converting plant) calculated.
5) CV_START module is assigned BPS and is opened order and Trigger Angle maintenance order, and SCA keeps Trigger Angle constant, and time delay a period of time waits BPS smooth opening;
6) after BPS opens, if | IDIFF_SCA |≤0.1, O_START_SCA sets to 0, and Trigger Angle is taken over by the current control amplifier of pole key-course again, and CV_IFO module sends the order that puts into operation, and inverter enters fully operational status.
CV_START sends and opens bypass cock BPS order, and after BPS opens a period of time, CV_IFO assigns valve group and puts into operation order, represents that inverter enters fully operational status.
After Trigger Angle is taken over by SCA, SCA calculates the formula of Trigger Angle foundation and is:
In formula, UdioFor unloaded DC voltage; UdioNFor rated no-load DC voltage; IdFor DC current; IdNFor rated direct current; dxFor perception pressure drop relatively; drFor relatively resistive pressure drop; α is Trigger Angle. Udio、IdFor real-time measurement values; UdioN、IdN、dx、drFor setting value.
Wherein, Udio=230kV, UdioN=230kV,
dx=9.2%, dr=0.3%,
Work as UdWhen=0, α ≈ 85 ° can be tried to achieve
Namely, when inverter Trigger Angle is equal to 85 °, valve group both end voltage is 0.
The process exiting CV1 online is as follows:
The premise CV1, the CV2 that exit online have been put into steady-state operation, and its principle followed is: first exit Inverter Station, backed off after random converting plant.
(1) Inverter Station inverter (Inverter Station is corresponding with device in converting plant identical, therefore does not differentiate between label) is exited online
1) Trigger Angle by current control amplifier is exported limits, and order Inverter Station converter valve CV1 Trigger Angle drops to 90 degree with certain slope, and now CV1 valve group voltage is close to 0;
2) put into Inverter Station to bypass (BPPO), provide a current channel for DC current;
3) Guan Bi Inverter Station bypass chopper BPS, electric current is transferred in BPS;
4) locking Inverter Station converter valve, when current over-zero, converter valve stops conducting;
5) Guan Bi bypass isolation switch BPI, pulls open BPS, opens isolation switch AI, CI, thus isolating converter valve, DC current is transferred to bypass and kept apart the Central Shanxi Plain.
(2) converting plant inverter is exited online
1) Trigger Angle by current control amplifier is exported limits, and order converting plant converter valve CV1 Trigger Angle rises to 90 degree with certain slope, and now CV1 valve group voltage is close to 0;
2) put into Inverter Station to bypass (BPPO), provide a current channel for DC current;
3) Guan Bi Inverter Station bypass chopper BPS, electric current is transferred in BPS;
4) locking Inverter Station converter valve, when current over-zero, converter valve stops conducting;
5) Guan Bi bypass isolation switch BPI, pulls open BPS, opens isolation switch AI, CI, thus isolating converter valve, DC current is transferred to bypass and kept apart the Central Shanxi Plain.
Bypass chopper, bypass isolator operation process analysis:
Bypass chopper BPS, has arc-rupturing capacity. When chopper both end voltage is 0, and when flowing through its electric current generation zero crossing, pull open BPS, in the moment that switch contact separates, chopper resistance can much larger than the resistance of isolation switch, and electric current thereon can forward on isolation switch at once, so that the bypass smooth current interruption of chopper.
Limited by the Trigger Angle that current control amplifier is exported, converter valve Trigger Angle is made to decline/rise to 90 ° with certain slope, now valve group voltage is close to 0, then pass through throwing bypass to, locking, finally isolate converter valve, complete the transfer process of DC current, make DC current transfer to bypass and keep apart the Central Shanxi Plain, form current path.
It is unrelated with SCA module that valve group exits process, is limited by the Trigger Angle that current control amplifier is exported, and then throws bypass to, locking, completes the transfer of DC current, it is achieved exiting online of valve group.
A kind of specific embodiment given above, but the present invention is not limited to described embodiment.The basic ideas of the present invention are in that such scheme, for those of ordinary skill in the art, according to the teachings of the present invention, design the formula of various deformation, parameter be not required to cost creative work. The change, amendment, replacement and the modification that without departing from the principles and spirit of the present invention embodiment are carried out still fall within protection scope of the present invention.
Claims (1)
1. the online withdrawal control method of extra-high voltage direct-current transmission engineering inverter, it is characterised in that step is as follows:
1) Trigger Angle by current control amplifier is exported limits, and order Inverter Station converter valve CV1 Trigger Angle drops to 90 degree with certain slope, and now valve group voltage is close to 0;
2) put into Inverter Station to bypass (BPPO), provide a current channel for DC current;
3) Guan Bi Inverter Station bypass chopper BPS, electric current is transferred in BPS;
4) locking Inverter Station converter valve, when current over-zero, converter valve stops conducting;
5) Guan Bi bypass isolation switch BPI, pulls open BPS, opens isolation switch AI, CI, thus isolating converter valve CV1, DC current is transferred to bypass and kept apart the Central Shanxi Plain;
6) Trigger Angle by current control amplifier is exported limits, and order converting plant converter valve CV1 Trigger Angle rises to 90 degree with certain slope, and now valve group voltage is close to 0;
7) put into Inverter Station to bypass (BPPO), provide a current channel for DC current;
8) Guan Bi Inverter Station bypass chopper BPS, electric current is transferred in BPS;
9) locking Inverter Station converter valve, when current over-zero, converter valve stops conducting;
10) Guan Bi bypass isolation switch BPI, pulls open BPS, opens isolation switch AI, CI, thus isolating inverter, DC current is transferred to bypass and kept apart the Central Shanxi Plain.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310690419.XA CN103647300B (en) | 2013-12-16 | 2013-12-16 | Extra-high voltage direct-current transmission engineering inverter puts into and withdrawal control method online |
| PCT/CN2014/087808 WO2015090100A1 (en) | 2013-12-16 | 2014-09-29 | On-line deblocking and blocking control method for extra-high voltage direct current transmission project converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310690419.XA CN103647300B (en) | 2013-12-16 | 2013-12-16 | Extra-high voltage direct-current transmission engineering inverter puts into and withdrawal control method online |
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| Publication Number | Publication Date |
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| CN103647300A CN103647300A (en) | 2014-03-19 |
| CN103647300B true CN103647300B (en) | 2016-06-15 |
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| WO (1) | WO2015090100A1 (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103647300B (en) * | 2013-12-16 | 2016-06-15 | 国家电网公司 | Extra-high voltage direct-current transmission engineering inverter puts into and withdrawal control method online |
| CN104092208B (en) * | 2014-06-25 | 2016-07-06 | 国家电网公司 | The control method of a kind of DC transmission engineering bivalve sets in parallel operation and device |
| CN106159986B (en) * | 2015-04-15 | 2018-10-16 | 南京南瑞继保电气有限公司 | A kind of parallel high voltage DC transmission system valve group puts into the method exited online |
| CN106385047B (en) * | 2016-11-18 | 2019-01-01 | 南方电网科学研究院有限责任公司 | Full-bridge topology bipolar wiring flexible direct current converter station and neutral wire wiring device thereof |
| CN107437795B (en) * | 2017-09-20 | 2020-06-26 | 南方电网科学研究院有限责任公司 | Polar ESOF control method for hybrid direct-current power transmission system and hybrid direct-current power transmission system |
| CN108649598B (en) * | 2018-06-19 | 2021-09-10 | 西安端怡科技有限公司 | Valve bank online switching control method for series double-valve-bank hybrid direct-current power transmission system |
| CN108879753B (en) * | 2018-07-23 | 2020-09-01 | 南方电网科学研究院有限责任公司 | Single valve group fault exit method, system and equipment for extra-high voltage direct current transmission system |
| CN109327039B (en) * | 2018-10-26 | 2020-04-14 | 贵州电网有限责任公司 | Valve bank on-line switching control method for extra-high voltage multi-terminal hybrid direct-current power transmission system |
| CN110401230B (en) * | 2019-07-04 | 2021-11-19 | 南方电网科学研究院有限责任公司 | Extra-high voltage hybrid direct current system receiving end VSC fault quitting method, equipment and medium |
| CN113629749B (en) * | 2020-05-09 | 2023-09-08 | 南京南瑞继保电气有限公司 | Single-station exit method and device of multi-terminal direct current transmission system |
| CN112436539B (en) * | 2020-12-11 | 2023-06-16 | 南方电网科学研究院有限责任公司 | Extra-high voltage flexible direct current system and on-line valve group throwing optimal control method |
| CN112993950B (en) * | 2021-03-01 | 2022-11-15 | 国网经济技术研究院有限公司 | Flexible direct current converter valve alternating current connecting line single-phase earth fault protection system and method |
| CN113054680A (en) * | 2021-03-17 | 2021-06-29 | 南方电网科学研究院有限责任公司 | Direct-current transmission power inversion method, device, equipment and storage medium |
| CN113147518B (en) * | 2021-04-21 | 2024-01-23 | 重庆中车长客轨道车辆有限公司 | Power supply system conversion method for rail transit contact network |
| CN113644678B (en) * | 2021-06-25 | 2023-08-04 | 湖南大学 | Method and system for calculating trigger angle instruction of high-voltage direct-current transmission system |
| CN113629750B (en) * | 2021-08-09 | 2023-06-06 | 南方电网科学研究院有限责任公司 | Back-to-back high-voltage direct-current transmission system and unlocking starting method thereof |
| CN114188956B (en) * | 2021-12-03 | 2024-06-25 | 南瑞集团有限公司 | Transient stability emergency control method, device and storage medium considering direct current sequential locking time difference |
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| CN103647300B (en) * | 2013-12-16 | 2016-06-15 | 国家电网公司 | Extra-high voltage direct-current transmission engineering inverter puts into and withdrawal control method online |
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- 2013-12-16 CN CN201310690419.XA patent/CN103647300B/en not_active Expired - Fee Related
-
2014
- 2014-09-29 WO PCT/CN2014/087808 patent/WO2015090100A1/en active Application Filing
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| US4126892A (en) * | 1974-09-11 | 1978-11-21 | Asea Ab | Selective voltage and current control for high voltage D.C. transmission systems |
| CN101719666A (en) * | 2008-10-09 | 2010-06-02 | 许继电气股份有限公司 | Ultra-high voltage DC series valve bank on-off control method |
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| 《向家坝至上海特高压直流输电工程换流器的投退策略分析》;李新年等;《高电压技术》;20110531;第37卷(第5期);20110531 * |
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| Publication number | Publication date |
|---|---|
| WO2015090100A1 (en) | 2015-06-25 |
| CN103647300A (en) | 2014-03-19 |
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