CN105391293A - Method for starting modularized multi-level flexible direct-current transmission converter - Google Patents
Method for starting modularized multi-level flexible direct-current transmission converter Download PDFInfo
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- CN105391293A CN105391293A CN201510968043.3A CN201510968043A CN105391293A CN 105391293 A CN105391293 A CN 105391293A CN 201510968043 A CN201510968043 A CN 201510968043A CN 105391293 A CN105391293 A CN 105391293A
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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
- H02M1/36—Means for starting or stopping converters
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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
- 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
- H02J2003/365—Reducing harmonics or oscillations in HVDC
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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 present invention provides a method for starting a modularized multi-level flexible direct-current transmission converter. The method comprises: connecting a direct-current side pole of each converter station, disconnecting an alternating-current circuit breaker of each converter station, and locking a sub module of each converter station; closing an alternating-current circuit breaker of an active station at one end, and a power supply carrying out passive charging on the active station and the remaining converter stations by using startup resistors; after the passive charging is completed, bypassing the startup resistor of the active station, unlocking the remaining converter stations, and carrying out active charging to reach a rated voltage of a power module; interlocking the remaining converter stations, the converter stations charged by the active station carrying out unlocking and starting direct-current voltage control subjected to a slope until the power module is charged to the rated voltage; and unlocking the remaining converter stations, after entering into a controlled stage again, carrying out grid connection and switching a control policy to a normal operation policy, and increasing power, wherein the converter operates normally. According to the method disclosed by the present invention, voltage consistency of the power module in the starting process can be ensured, so as to avoid startup failure and protection locking caused by unevenness of the capacitance and voltage of the power module.
Description
Technical field
The present invention relates to flexible direct-current transmission field, be specifically related to a kind of modular multi-level flexible direct-current transmission converter starting method.
Background technology
Modularization multi-level converter (MMC) develops a kind of flexible DC power transmission topological structure comparatively rapidly in the world at present, converter before activation, its core cell submodule is in non-electriferous state, rated voltage when reaching its work for enabling submodule, and reduce the impact to electrical network and primary equipment between submodule charge period, a kind of rationally effective modular multi-level flexible direct-current transmission converter starting method is absolutely necessary.
Chinese Patent Application No.: 201210462977 disclose a kind of modular multi-level flexible direct-current transmission converter starting method, introduce a kind of submodule pressure equalizing control method of modularization multi-level converter, mainly the startup of single converter is illustrated, the startup sequential between both-end or multiterminal modularization multi-level converter and control method is not described.
China's application number: 201510216572 disclose a kind of a kind of firing test method that modular multi-level flexible direct-current transmission converter starting method describes modular multi-level multi-terminal flexible direct-current transmission converter, this patent is that the current conversion station determining direct voltage is handed in station prosecutor formula, after DC voltage stability, this station is dropped into closed loop and is all pressed charging method, and the current conversion station determining direct voltage by this starts the DC voltage control of band slop control, define being controlled by the current conversion station determining direct voltage of direct voltage improvement stage, if and station prosecutor formula is that the current conversion station determining direct voltage is undertaken charging by DC side and do not set up AC voltage, just this starting method is no longer met, there is limitation in said method.
Existing converter starting method; for the current conversion station of DC side charging; just carried out the charging of power model by mode power model quantity being gradually reduced to quantity when normally working when first time unlocks controlled charging; do not consider that the power model quantity by reducing input further makes power module voltage charge to rated operational voltage; voltage consistency is poor; power model capacitance voltage is uneven, the startup failure easily caused and protection blocking.
Summary of the invention
For solving the above problems and defect, the object of this invention is to provide a kind of modular multi-level flexible direct-current transmission converter starting method, when far-end current conversion station unlocks, the power model making all the other stand by minimizing power model input quantity is disposable charges to rated operational voltage, solve the overshoot in converter start-up course, power module voltage scattering problem simultaneously.
For achieving the above object, the present invention by the following technical solutions:
A kind of modular multi-level flexible direct-current transmission converter starting method, when far-end current conversion station unlocks, control to drop into power models all in brachium pontis, charged to power model by the mode reducing power model input quantity gradually, and dropping into power model Pressure and Control, disposable power models by all the other stations charge to rated operational voltage;
Concrete steps are as follows:
A, each current conversion station direct current side pole connect, and each current conversion station AC circuit breaker disconnects, the locking of each current conversion station submodule;
There is the AC circuit breaker of source station B, closed one end, power supply has source station and remaining current conversion station not controlled charging thereof by starting resistance to this, when all the other current conversion stations are consistent with power model quantity in single brachium pontis of the current conversion station having source station to charge, the current conversion station power model charged by there being source station is 2 times of all the other current conversion station power module voltage;
C, detection current conversion station direct voltage or each current conversion station submodule voltage, when direct voltage or each current conversion station submodule voltage reach set point, the starting resistance of the active charging current conversion station of bypass, maintains the current conversion station submodule locking of source station charging, and all the other current conversion stations unlock;
When D, all the other current conversion stations unlock, control to drop into power models all in brachium pontis, charged to power model by the mode reducing power model input quantity gradually, and drop into power model Pressure and Control, until the power model at all the other stations all reaches rated operational voltage;
E, all the other current conversion stations of locking, the current conversion station simultaneously having source station to charge unlocks and starts the DC voltage control of band slop control, until power model charges to rated voltage;
If the current conversion station power model that F has source station to charge is to rated voltage, unlock all the other current conversion station power models;
G, all the other current conversion stations start alternating voltage and control, and meet after grid-connected requirement until alternating voltage, all the other station AC circuit breaker closed;
H, switching control strategy, start control strategy when normally running; Start-up course terminates,
I, bring to power, converter enters normal operation.
Further, in above-mentioned steps D, by controlling the speed reducing power model quantity, reduce the current peak in all the other station power model charging processes.
Further, in above-mentioned steps F, if there have source station power module voltage to be promoted to time of rated voltage in step e to be shorter, the foundation of active station direct voltage was completed within several seconds zero point, now the voltage of the power model DC capacitor of all the other current conversion stations remains unchanged substantially at rated operational voltage, all the other current conversion stations power model number that each brachium pontis drops into when unlocking is N=Udc/Ucref, and wherein Udc is direct voltage, and Ucref is power model rated voltage;
Further, in above-mentioned steps F, if there have source station power module voltage to be promoted to time of rated voltage in step e to be longer, now the voltage of the power model DC capacitor of all the other current conversion stations is through the conductive discharge by parallel connection, its direct voltage will decline to some extent, all the other each current conversion stations power model number that each brachium pontis drops into when unlocking is N=Udc/Ucave, and power model quantity when being increased to normal work gradually, wherein Udc is direct voltage, and Ucave is the measurement mean value of each current conversion station power module voltage.
Method of the present invention can be used for the startup of both-end or multiterminal modularization multi-level converter, can produce the problem of greater impact electric current in order to solve unblock in charging process; Drop into power model all press strategy that the voltage of each module in charging process can be made to keep consistency, solve have source converter not controlled charging time all the other converter power module capacitance voltages too low, easily cause the problem that power module voltage is dispersed; Can the voltage consistency of guaranteed output module in start-up course, avoid the uneven startup failure that causes of power model capacitance voltage and protection blocking.
The foundation of rated direct voltage is by there being source station to start DC voltage control, station control strategy when not being defined as normal operation is the current conversion station of DC voltage control, realize station control strategy when normally running by the method for the controlling tactic switch of step H, add the applicability of starting method.
By first power module voltage being charged to rated operational voltage, unlocking behind all the other stations of locking has source station to promote direct voltage again, the direct voltage stage can be promoted having source station, isolation has the flow of power of source station and remaining current conversion station thereof, there will not be flowing and the overcurrent of direct current while fast lifting direct voltage.
Further, by controlling the speed reducing power model quantity, the current peak in all the other station power model charging processes effectively can be reduced.
Accompanying drawing explanation
Fig. 1 is flow chart of the invention process.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
With reference to figure 1, modular multi-level flexible direct-current transmission converter starting method of the present invention, when far-end current conversion station unlocks, control to drop into power models all in brachium pontis, charged to power model by the mode reducing power model input quantity gradually, and dropping into power model Pressure and Control, disposable power models by all the other stations charge to rated operational voltage.
Specifically comprise step as follows:
A, each current conversion station direct current side pole connect, and each current conversion station AC circuit breaker disconnects, the locking of each current conversion station submodule;
There is the AC circuit breaker of source station B, closed one end, power supply has source station and remaining current conversion station not controlled charging thereof by starting resistance to this, when all the other current conversion stations are consistent with power model quantity in single brachium pontis of the current conversion station having source station to charge, the current conversion station power model charged by there being source station is 2 times of all the other current conversion station power module voltage;
C, detection current conversion station direct voltage or each current conversion station submodule voltage, when direct voltage or each current conversion station submodule reach set point, the starting resistance of the active charging current conversion station of bypass, maintains the current conversion station submodule locking of source station charging, and all the other current conversion stations unlock;
When D, all the other current conversion stations unlock, control to drop into power models all in brachium pontis, charged to power model by the mode reducing power model input quantity gradually, and drop into power model Pressure and Control, until the power model at all the other stations all reaches rated operational voltage;
Further, in above-mentioned steps D, by controlling the speed reducing power model quantity, the current peak in all the other station power model charging processes effectively can be reduced;
Further, the power model of input all presses strategy that the voltage of each module in charging process can be made to keep consistency, the power module voltage divergence problem caused when solution power module voltage is low;
E, all the other current conversion stations of locking, the current conversion station simultaneously having source station to charge unlocks and starts the DC voltage control of band slop control, until power model charges to rated voltage;
Further, in above-mentioned steps E, rated operational voltage has been charged to and locking at the power model at all the other stations of charging through step D, now unlock again and have source station and the DC voltage control starting band slop control, have between source station and all the other current conversion stations and will there is no flow of power, contribute to the fast lifting of active station direct voltage, the electric current in its power ascension stage is also not too large simultaneously.
If the current conversion station power model that F has source station to charge is to rated voltage, unlock all the other current conversion station power models.
Further, in above-mentioned steps F, if there have source station power module voltage to be promoted to time of rated voltage in step e to be shorter, as just completed the foundation of active station direct voltage within several seconds zero point, now the voltage of the power model DC capacitor of all the other current conversion stations remains unchanged substantially at rated operational voltage, all the other current conversion stations power model number that each brachium pontis drops into when unlocking is N=Udc/Ucref, and wherein Udc is direct voltage, and Ucref is power model rated voltage;
Further, in above-mentioned steps F, if there have source station power module voltage to be promoted to time of rated voltage in step e to be longer, now the voltage of the power model DC capacitor of all the other current conversion stations is through the conductive discharge by parallel connection, its direct voltage will decline to some extent, all the other each current conversion stations power model number that each brachium pontis drops into when unlocking is N=Udc/Ucave, and power model quantity when being increased to normal work gradually, wherein Udc is direct voltage, and Ucave is the measurement mean value of each current conversion station power module voltage;
G, all the other current conversion stations start alternating voltage and control, and meet after grid-connected requirement until alternating voltage, close all the other station AC circuit breaker;
H, switching control strategy, start control strategy when normally running; Start-up course terminates,
I, bring to power, converter enters normal operation.
Claims (4)
1. a modular multi-level flexible direct-current transmission converter starting method, it is characterized in that: when far-end current conversion station unlocks, control to drop into power models all in brachium pontis, charged to power model by the mode reducing power model input quantity gradually, and dropping into power model Pressure and Control, disposable power models by all the other stations charge to rated operational voltage;
Concrete steps are as follows:
A, each current conversion station direct current side pole connect, and each current conversion station AC circuit breaker disconnects, the locking of each current conversion station submodule;
There is the AC circuit breaker of source station B, closed one end, power supply has source station and remaining current conversion station not controlled charging thereof by starting resistance to this, when all the other current conversion stations are consistent with power model quantity in single brachium pontis of the current conversion station having source station to charge, the current conversion station power model charged by there being source station is 2 times of all the other current conversion station power module voltage;
C, detection current conversion station direct voltage or each current conversion station submodule voltage, when direct voltage or each current conversion station submodule voltage reach set point, the starting resistance of the active charging current conversion station of bypass, maintains the current conversion station submodule locking of source station charging, and all the other current conversion stations unlock;
When D, all the other current conversion stations unlock, control to drop into power models all in brachium pontis, charged to power model by the mode reducing power model input quantity gradually, and drop into power model Pressure and Control, until the power model at all the other stations all reaches rated operational voltage;
E, all the other current conversion stations of locking, the current conversion station simultaneously having source station to charge unlocks and starts the DC voltage control of band slop control, until power model charges to rated voltage;
If the current conversion station power model that F has source station to charge is to rated voltage, unlock all the other current conversion station power models;
G, all the other current conversion stations start alternating voltage and control, and meet after grid-connected requirement until alternating voltage, all the other station AC circuit breaker closed;
H, switching control strategy, start control strategy when normally running; Start-up course terminates,
I, bring to power, converter enters normal operation.
2. modular multi-level flexible direct-current transmission converter starting method according to claim 1, is characterized in that: in above-mentioned steps D, by controlling the speed reducing power model quantity, can reduce the current peak in all the other station power model charging processes.
3. modular multi-level flexible direct-current transmission converter starting method according to claim 1, it is characterized in that: in above-mentioned steps F, if there have source station power module voltage to be promoted to time of rated voltage in step e to be shorter, the foundation of active station direct voltage was completed within several seconds zero point, now the voltage of the power model DC capacitor of all the other current conversion stations remains unchanged substantially at rated operational voltage, all the other current conversion stations power model number that each brachium pontis drops into when unlocking is N=Udc/Ucref, wherein Udc is direct voltage, and Ucref is power model rated voltage.
4. modular multi-level flexible direct-current transmission converter starting method according to claim 1, it is characterized in that: in above-mentioned steps F, if there have source station power module voltage to be promoted to time of rated voltage in step e to be longer, now the voltage of the power model DC capacitor of all the other current conversion stations is through the conductive discharge by parallel connection, its direct voltage will decline to some extent, all the other each current conversion stations power model number that each brachium pontis drops into when unlocking is N=Udc/Ucave, and power model quantity when being increased to normal work gradually, wherein Udc is direct voltage, Ucave is the measurement mean value of each current conversion station power module voltage.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108631573A (en) * | 2018-04-24 | 2018-10-09 | 华北电力科学研究院有限责任公司 | The converter deblocking method and flexible direct current power transmission system of flexible direct current power transmission system |
| CN109494971A (en) * | 2018-10-11 | 2019-03-19 | 特变电工新疆新能源股份有限公司 | A kind of flexible HVDC transmission system DC bus be shorted in the case of starting strategy |
| CN111313451A (en) * | 2019-11-29 | 2020-06-19 | 国网天津市电力公司电力科学研究院 | Medium-voltage direct-current power distribution network starting method based on half-bridge MMC |
| CN111654053A (en) * | 2020-06-18 | 2020-09-11 | 南方电网科学研究院有限责任公司 | Unlocking starting method, device and equipment of flexible direct current system |
| CN115940243A (en) * | 2022-11-29 | 2023-04-07 | 中国南方电网有限责任公司超高压输电公司广州局 | Charging sequence control method and device for extra-high voltage flexible direct current converter station |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108631573A (en) * | 2018-04-24 | 2018-10-09 | 华北电力科学研究院有限责任公司 | The converter deblocking method and flexible direct current power transmission system of flexible direct current power transmission system |
| CN109494971A (en) * | 2018-10-11 | 2019-03-19 | 特变电工新疆新能源股份有限公司 | A kind of flexible HVDC transmission system DC bus be shorted in the case of starting strategy |
| CN111313451A (en) * | 2019-11-29 | 2020-06-19 | 国网天津市电力公司电力科学研究院 | Medium-voltage direct-current power distribution network starting method based on half-bridge MMC |
| CN111654053A (en) * | 2020-06-18 | 2020-09-11 | 南方电网科学研究院有限责任公司 | Unlocking starting method, device and equipment of flexible direct current system |
| CN115940243A (en) * | 2022-11-29 | 2023-04-07 | 中国南方电网有限责任公司超高压输电公司广州局 | Charging sequence control method and device for extra-high voltage flexible direct current converter station |
| CN115940243B (en) * | 2022-11-29 | 2024-04-02 | 中国南方电网有限责任公司超高压输电公司广州局 | Charging sequence control method and device for extra-high voltage flexible direct current converter station |
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