CN106549408A - A kind of multiterminal HVDC transmission system inverter puts into method online - Google Patents
A kind of multiterminal HVDC transmission system inverter puts into method online Download PDFInfo
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- CN106549408A CN106549408A CN201610887139.1A CN201610887139A CN106549408A CN 106549408 A CN106549408 A CN 106549408A CN 201610887139 A CN201610887139 A CN 201610887139A CN 106549408 A CN106549408 A CN 106549408A
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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
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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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- Inverter Devices (AREA)
Abstract
The present invention relates to a kind of multiterminal HVDC transmission system inverter puts into method online, put into operation using constant DC voltage control pattern by one end inverter to inverter side, other end inverters of inverter side are put into operation using Given current controller pattern, realize that the stable of inverter is incorporated to online, and without interference with the stable operation of other inverters.Meanwhile, the method can be realized conveying power precise control to inverter, be easy to the departments such as scheduling to realize conveying inverter the control of power.
Description
Technical field
The present invention relates to a kind of multiterminal HVDC transmission system inverter puts into method online, belong to HVDC Transmission Technology
Field.
Background technology
In technical field of ultrahigh voltage direct current, the inverter of topological structure in parallel has to be increased ability of supplying electric power, strengthens straight
The features such as stream transmission reliability and direct current transportation motility, and whole system Insulation Coordination is convenient, performance driving economy is high.Specifically
Ground, for China High Altitude in West China area, such as Tibet, Qinghai etc. are affected by height above sea level factor, inverter can be replaced in parallel
The mode for raising DC voltage level lifts direct current transmission capacity；Or for the failure of certain inverter, conveniently can exit
The failure inverter, and the transmission of dc power will not be interrupted；If or when there is current limit for certain inverter, can be with
By improving the electric current that another inverter in side in parallel passes through, keep whole direct current transmission capacity constant.
Both-end DC transmission system of the prior art, in normal course of operation, rectification side is generally adopted determines electric current control
Molding formula, it is ensured that direct current conveys power invariability；Inverter side is adopted determines gamma kick pattern or constant DC voltage control pattern, really
Protect rectification side DC bus-bar voltage stable in pre-set interval or predetermined value.
For multi-terminal system, it is desirable to which rectification side inverter adopts Given current controller pattern, the inverter at least of inverter side
It is individual to put into determine voltage mode control, in input, if multiple inverters all adopt constant voltage mode to put into, can be to other just
Inverter in operation is interfered, the problems such as cause commutation failure, Trigger Angle fluctuation, DC voltage fluctuation.
The content of the invention
It is an object of the invention to provide a kind of HVDC transmission system inverter puts into method online, it is existing for solving
Multiple inverters are put into being currently running the problem that inverter is interfered with constant voltage mode in inverter side in technology.
To solve above-mentioned technical problem, the present invention proposes that a kind of HVDC transmission system inverter puts into method online,
Comprise the following steps：
The inverter of control rectification side runs on Given current controller pattern, detects the working condition of straight-flow system；Work as direct current
When system is in transmission operation state, the inverter of the inverter side that control need to put into is put into Given current controller pattern.
Further, when straight-flow system is in hot stand-by duty, and when inverter side only puts into an inverter, control this and change
Stream device is put into determining voltage mode control；When straight-flow system is in hot stand-by duty, and when inverter side puts into multiple inverters,
One of them is controlled to determine voltage mode control input, other inverters are put into Given current controller pattern.
The invention has the beneficial effects as follows：The present invention proposes that a kind of HVDC transmission system inverter puts into method online,
HVDC transmission system to two or more inverters of inverter side parallel connection, during straight-flow system transmission operation,
By controlling using the coordination of constant current mode to inverter side inverter, realize that the stable of inverter is incorporated to online, and will not
Disturb the stable operation of other inverters, it is to avoid sending out situations such as commutation failure, Trigger Angle fluctuation, DC voltage fluctuation
It is raw.Meanwhile, the present invention can realize the precise control that power is conveyed to inverter, be easy to the departments such as scheduling flexibly to control inverter
Conveying power, and there is actual directive significance to the design of the actual control strategy of multi-terminal direct current transmission system in parallel.
Description of the drawings
Fig. 1 is typical three ends parallel connection direct transmission system；
Fig. 2 is typical multiterminal parallel connection direct transmission system；
Fig. 3 is typical three ends parallel connection direct transmission system converter Control characteristic curve；
Fig. 4 is that inverter puts into the logic diagram for realizing internal ring control online；
Fig. 5 is typical three ends parallel connection multi-terminal system while starting record ripple；
Fig. 6 is record ripple of the typical three ends parallel connection multi-terminal system inverter side inverter after line input.
Specific embodiment
Below in conjunction with the accompanying drawings the specific embodiment of the present invention is further described.
A kind of multiterminal HVDC transmission system inverter of the present invention puts into the embodiment of method online：
Fig. 1 show a typical three ends parallel connection direct transmission system, and the DC transmission system send two modes to design for one,
Converting plant, Inverter Station 1 and an Inverter Station 2 are included, and three current conversion stations are connected to same dc bus using parallel way
On, Inverter Station 1 is provided with the first inverter and the second inverter, and Inverter Station 2 is provided with the 3rd inverter and the 4th inverter.
Three above-mentioned end parallel connection direct transmission systems are the bipolar method of operation, as shown in figure 1, it is transported equivalent to two groups of one poles
The straight-flow system of one bipolar method of operation of line mode composition, wherein first group is converting plant inverter Cv0-1, Inverter Station 1 changes
Stream device Cv1-1With 2 inverter Cv of Inverter Station2-1The monopolar D. C transmission system of composition, second group is converting plant inverter Cv0-2, it is inverse
Become 1 inverter Cv of station1-2With 2 inverter Cv of Inverter Station2-2The monopolar D. C transmission system of composition.Transmitted electricity with first group of monopolar D. C
As a example by system, converting plant inverter Cv is controlled first0-1Run on Given current controller pattern, it is ensured that the power invariability of direct current conveying,
Then detect the working condition of straight-flow system.
Before inverter input, according to the working condition of straight-flow system --- hot stand-by duty or power transmission state, select phase
The control strategy input inverter side inverter answered.When straight-flow system is in transmission operation state, i.e. 1 inverter Cv of Inverter Station1-1
Operate in and determined DC voltage pattern, then put into inverter Cv2-1When, only need to control inverter Cv2-1With Given current controller mould
Formula puts into operation, you can realize that the stable of inverter is incorporated to online, and without interference with the stable operation of other inverters.
When straight-flow system is in hot stand-by duty, if inverter side need to only put into an inverter, such as 1 change of current of Inverter Station
Device Cv1-1, select normal release mode to put into the inverter, that is, control inverter Cv1-1Put into constant DC voltage control pattern
Operation.If desired multiple inverters are put in inverter side simultaneously, the one of inverter side inverter of control runs on determines unidirectional current
Die pressing type, other inverter side inverters run on constant current mode.1 inverter Cv of Inverter Station is put into such as1-1Change with Inverter Station 2
Stream device Cv2-1, control one of 1 inverter Cv of inverter Inverter Station1-1Constant current mode is operated in, 2 change of current of Inverter Station is controlled
Device Cv2-1Operate in and determine DC voltage pattern.
Shown in Fig. 3 is in heat with first group of monopolar DC system and straight-flow system of above-mentioned three end bipolar direct current transmission system
The performance curve situation of multiple inverters, i.e. inverter side input 1 inverter Cv of Inverter Station are put under resting state1-1With it is inverse
Become 2 inverter Cv of station2-1Situation.Rectification side inverter performance curve shown in converting plant 1 characteristic curve correspondence Fig. 1.It is whole
Its characteristic curve is divided into three sections of designs by the performance curve design of stream side inverter, respectively corresponding minimum trigger angle control section,
Constant DC current control section, current limiting low-voltage control section.Minimum trigger angle control section is mainly used in solving when AC system voltage is different
Often drop, after rectification side loses Given current controller power, rectification side is maintained into minimum trigger angle running status, is typically maintained in
5°；Constant DC current control section is rectification side inverter normal work section, stable sending end inverter outlet dc bus outlet electricity
Stream；Current limiting low-voltage control section is mainly used in the DC voltage drop by reasons such as AC system exceptions, volitional check unidirectional current
Stream reference value, reaches fast quick-recovery DC transmission system stable.
1 inverter Cv of Inverter Station1-1Characteristic curve as shown in figure 3, points of four sections designs of its performance curve, i.e., fixed straight
Flow voltage control section, determine gamma kick section, constant DC current control section, current limiting low-voltage control section.Under normal circumstances, inverter
Cv1-1Operate in constant DC current control section；To prevent inverter Cv1-1Constant DC voltage control is entered under normal operation
Section, captures inverter side inverter Cv2-1DC voltage control is weighed, and its voltage margin setting value is raised by spy；Determine gamma kick section
It is mainly used in preventing inverter side operation blow-out angle too small, commutation failure occurs, the control section belongs to restriction section；Current limiting low-voltage is controlled
Section is used for preventing from causing DC voltage to drop under the such as unusual service condition such as alternating voltage drop, volitional check DC current reference value,
Reach fast quick-recovery DC transmission system stable.
2 inverter Cv of Inverter Station2-1Characteristic curve as illustrated, points of four sections designs of its performance curve, that is, determine direct current
Voltage control section, determine gamma kick section, constant DC current control section, current limiting low-voltage control section.Under normal circumstances, inverter
Cv2-1Operate in constant DC voltage control section；Gamma kick section is determined as restriction section, for preventing inverter side operation blow-out angle
It is too small, there is commutation failure；To prevent inverter side inverter Cv2-1Constant DC current control section is entered under normal operation, it is special
Inverter side inverter Cv in setting electric current nargin, i.e. Fig. 32-1Current reference value be rectification side Inverter circuit reference value Idref1
Deduct inverter side inverter Cv1-1Current reference value Idref2, then deduct scheduled current margin value (being typically set at 10%)；Low pressure
Current limited Control section is used for preventing from causing DC voltage to drop under the such as unusual service condition such as alternating voltage drop, volitional check DC current
Reference value, reaches fast quick-recovery DC transmission system stable.
Fig. 5 show three end parallel connection direct transmission systems while unlocking the oscillogram for starting record ripple, in figure：MUDHA11
(Sangtuda) converting plant DC voltage is represented, A11IDact (Sangtuda) represents converting plant DC current, A11firACT
(Sangtuda) converting plant Trigger Angle is represented, B11IDact (Peshawa) represents 1 DC current of Inverter Station, B11firACT
(Peshawa) 1 Trigger Angle of Inverter Station is represented, B12IDact (Kabul) represents 2 DC current of Inverter Station, B12firACT
(Kabul) 2 Trigger Angle of Inverter Station is represented, B11UctlINV represents that Inverter Station 1 determines voltage control, and B12curCtl represents Inverter Station 2
Given current controller.
As shown in figure 5,1 inverter Cv of Inverter Station1-1Constant DC current control pattern is operated in, DC current is stablized
60A, 2 inverter Cv of Inverter Station2-1Constant DC voltage control pattern is operated in, converting plant direct current outlet busbar voltage is maintained
495.5KV, converting plant inverter operate in constant DC current control pattern, and its dc bus outlet electric current maintains 130A.It is attached
Fig. 6 show inverter side inverter Cv1-1Record ripple after line puts into operation, as illustrated, inverter side inverter Cv1-1Input fortune
After row, by its current stabilization in 60A, rectification side inverter operates in constant DC current control mould to its constant DC current control device
Formula, maintains its direct current outlet bus current constant, inverter side inverter Cv2-1Constant DC voltage control pattern is operated in, remains straight
Stream current balance type, the electric current for flowing into its inverter reduce automatically.
Above example is the control situation that first group of bipolar one pole of three end high-voltage direct currents puts into inverter, and which the
The method of two groups of monopolar D. C transmission systems input inverters is similar to the above embodiments, i.e. the monopolar DC system of bipolar DC system can be with
Independently implement said method, that is, two inverters of each Inverter Station realize independent control.Above-mentioned high-voltage direct current it is double
Pole operation is effectively equivalent to the bipolar mode of operation of two monopolar operational mode compositions, exactly by bipolar operation in the present embodiment
Pattern splits into two monopolar operational modes, puts into what method was discussed to inverter according to monopolar operational mode, therefore, this
The described inverter of invention puts into the high-voltage direct current that method is equally applicable to monopolar operation online, concrete methods of realizing with it is upper
The monopolar operational mode split in stating embodiment is identical.
Above example is the situation of three end HVDC transmission system inverters input online, multiterminal of the present invention
The online input of HVDC transmission system inverter also includes two ends and situations more than three ends, as shown in Fig. 2 concrete grammar
It is similar with above-described embodiment.
The present invention puts into expansion online for one of difficult point in Multi-end flexible direct current transmission system i.e. inverter side inverter and sets
Meter research.Cooperated by controller between different inverters, realize that inverter side current conversion station is put into operation online, and thrown
Enter in transient process and steady state operation, impact is not produced on the stable operation for having run current conversion station.
Claims (2)
1. a kind of multiterminal HVDC transmission system inverter puts into method online, it is characterised in that comprise the following steps：
The inverter of control rectification side runs on Given current controller pattern, detects the working condition of straight-flow system；Work as straight-flow system
In transmission operation state when, the inverter of inverter side for controlling to put into is put into Given current controller pattern.
2. multiterminal HVDC transmission system inverter according to claim 1 puts into method online, it is characterised in that when
Straight-flow system is in hot stand-by duty, and when inverter side only puts into an inverter, controls the inverter to determine voltage control
Pattern puts into；When straight-flow system is in hot stand-by duty, and when inverter side puts into multiple inverters, one of them is controlled with fixed
Voltage mode control puts into, and other inverters are put into Given current controller pattern.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610887139.1A CN106549408A (en) | 2016-10-11 | 2016-10-11 | A kind of multiterminal HVDC transmission system inverter puts into method online |
| PCT/CN2017/070992 WO2018068435A1 (en) | 2016-10-11 | 2017-01-12 | Method for taking converter of multi-terminal high voltage direct current electric power transmission system into on-line operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610887139.1A CN106549408A (en) | 2016-10-11 | 2016-10-11 | A kind of multiterminal HVDC transmission system inverter puts into method online |
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| CN106549408A true CN106549408A (en) | 2017-03-29 |
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| CN (1) | CN106549408A (en) |
| WO (1) | WO2018068435A1 (en) |
Cited By (6)
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| CN108512242A (en) * | 2018-05-07 | 2018-09-07 | 北京四方继保自动化股份有限公司 | A kind of method that power instruction is coordinated between three ends mixed DC system station |
| CN110912172A (en) * | 2019-11-12 | 2020-03-24 | 许继电气股份有限公司 | Online input method and system for converter station of multi-terminal direct-current transmission system |
| CN111201688A (en) * | 2017-07-11 | 2020-05-26 | 超级电力研究所 | Method for controlling a high-voltage direct-current network in the event of a fault |
| CN111564863A (en) * | 2020-04-16 | 2020-08-21 | 南方电网科学研究院有限责任公司 | Third station online switching control system and method of direct current transmission system |
| CN111817332A (en) * | 2020-05-26 | 2020-10-23 | 南方电网科学研究院有限责任公司 | Method and device for power coordination control of direct current transmission system and storage medium |
| CN112039104A (en) * | 2020-07-16 | 2020-12-04 | 南京东博智慧能源研究院有限公司 | Starting method of hybrid multi-terminal direct-current power transmission system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111201688A (en) * | 2017-07-11 | 2020-05-26 | 超级电力研究所 | Method for controlling a high-voltage direct-current network in the event of a fault |
| CN108512242A (en) * | 2018-05-07 | 2018-09-07 | 北京四方继保自动化股份有限公司 | A kind of method that power instruction is coordinated between three ends mixed DC system station |
| CN110912172A (en) * | 2019-11-12 | 2020-03-24 | 许继电气股份有限公司 | Online input method and system for converter station of multi-terminal direct-current transmission system |
| CN110912172B (en) * | 2019-11-12 | 2023-02-14 | 许继电气股份有限公司 | Online input method and system for converter station of multi-terminal direct-current transmission system |
| CN111564863A (en) * | 2020-04-16 | 2020-08-21 | 南方电网科学研究院有限责任公司 | Third station online switching control system and method of direct current transmission system |
| CN111817332A (en) * | 2020-05-26 | 2020-10-23 | 南方电网科学研究院有限责任公司 | Method and device for power coordination control of direct current transmission system and storage medium |
| CN112039104A (en) * | 2020-07-16 | 2020-12-04 | 南京东博智慧能源研究院有限公司 | Starting method of hybrid multi-terminal direct-current power transmission system |
| CN112039104B (en) * | 2020-07-16 | 2023-06-13 | 南京东博智慧能源研究院有限公司 | Starting method of hybrid multi-terminal direct current transmission system |
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Application publication date: 20170329 |