CN106208128A - Power reversal method of hybrid three-terminal high-voltage direct-current transmission system - Google Patents
Power reversal method of hybrid three-terminal high-voltage direct-current transmission system Download PDFInfo
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- CN106208128A CN106208128A CN201610716443.XA CN201610716443A CN106208128A CN 106208128 A CN106208128 A CN 106208128A CN 201610716443 A CN201610716443 A CN 201610716443A CN 106208128 A CN106208128 A CN 106208128A
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Classifications
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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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Abstract
The invention relates to a power inversion method of a hybrid three-terminal high-voltage direct-current transmission system, wherein the hybrid three-terminal high-voltage direct-current transmission system comprises two LCC type converter stations A and C and an FB-MMC converter station B, after a rectification converter station A receives an inversion command, direct current is reduced, a rectification state is cleared and a clear signal is sent to the inversion converter station C, direct current voltage of the converter station C is reduced, the inversion state is cleared and the rectification signal is set; and after the converter station A and the converter station C complete the power reversal, the converter station B is switched to the active power mode to control and increase the active power reference value. The power inversion method can smoothly change the polarity of current and voltage, complete the online power inversion of the hybrid three-terminal direct-current power transmission system and ensure the stable and safe operation of the system.
Description
Technical field
The invention belongs to Power Electronic Technique and direct current transportation field, mix three end D.C. high voltage transmissions particularly to one
The power reverses method of system.
Background technology
HVDC transmission system commonly uses two ends topological structure, i.e. one converting plant and an Inverter Station at present, divides
Jie Ru two AC networks.But a lot of occasions are more suitable for using multiterminal HVDC transmission system structure, such as: from energy base
Ground carries a large amount of electric power several load centers, DC power transmission line medial fascicle access load or power supply, several orphan to a distant place
Vertical AC system DC line realizes non-synchronous contact.Along with raising and the reduction of cost of direct current transportation reliability, with
And the development of dc circuit breaker manufacturing technology, the research of multi-terminal direct current transmission system have also been obtained extensive concern and research.
The three end conventional high-pressure DC transmission engineerings put into operation at present are all to use the fully controlled bridge inverter of line commutation
Accessing weak AC network, this inverter there are disadvantages that, as this inverter can only realize merit by changing polarity of voltage
Rate inverts, for the HVDC transmission system of two ends, it is possible to achieve online power reverses, but for multi-terminal high-voltage direct current
For transmission system, it needs additional configuration direct-current isolating switch, and straight-flow system is stopped transport, then by demand Guan Bi direct current every
Leave pass, the power reverses of three end HVDC transmission systems could be realized, and if straight-flow system is stopped transport and will be caused inverter side
It is severely affected, whole transmission system overload, directly threatens the stable operation of DC transmission system, how to realize
The three online power reverses of end HVDC transmission system are the keys solving the problems referred to above.
Summary of the invention
The technical problem to be solved in the present invention is to provide the power reverses side of a kind of mixing three end HVDC transmission systems
Method, for solving the problem that three end HVDC transmission systems cannot realize online power reverses.
For solving the problem proposed in above-mentioned technical background, the technical solution that the present invention proposes is: provide one mixed
Close three end HVDC transmission systems and include two LCC type current conversion stations and a FB-MMC type current conversion station；Two LCC type current conversion stations
It is designated as current conversion station A and C, FB-MMC type current conversion station respectively and is designated as current conversion station B；
For above-mentioned mixing three end HVDC transmission system propose online power reverses method be: set current conversion station A as
Converting plant, current conversion station C is Inverter Station, and after described current conversion station A and C receives inverted command, current conversion station A controls to reduce DC current
Decline with direct voltage reference value, until the rectification state of current conversion station A resets and reset signal is sent to current conversion station C；
After current conversion station C receives described reset signal, control to reduce DC voltage, until current conversion station C inverter mode resets,
Set signal is also sent to current conversion station A by rectified signal set, controls the rated value that DC current is gradually brought to bear subsequently；
After current conversion station A receives described set signal, control the rated value that DC voltage is reversely increase rapidly up to bear；
After current conversion station B receives inverted command, control to reduce active power reference value, until current conversion station B switches to direct current
Current control mode, controlling DC current is 0, and after current conversion station A and C completes power reverses, current conversion station B switches to active power
Pattern, controls to increase active power reference value.
Further, after described current conversion station A receives inverted command, control DC current and drop to 0.15pu, same to time control
Direct voltage reference value processed drops to 0.2pu；After described current conversion station C receives the reset signal of current conversion station A, control to reduce direct current
Voltage drops to 0.2pu.
Further, the full-bridge modules multilevel converter of described current conversion station B includes DC current controller and submodule
Block capacitor voltage balance controller, under normal circumstances, described DC current controller output Udcref/ 2 instruct as DC voltage,
Described submodule capacitor voltage balance controller output PrefInstruct as active power；
In the case of DC Line Fault, the input of described DC current controller includes: DC current, DC current reference value and electricity
Stream nargin, described DC current reference value obtains error amount with DC current, current margins work difference, and described error amount is controlled through PI
System produces DC voltage instruction, and output higher limit keeps constant, and lower limit is Udcmin/2；The balance control of described submodule capacitor voltage
Device processed input includes: submodule capacitor voltage reference value, submodule capacitor voltage meansigma methods and submodule capacitor voltage nargin, institute
State submodule capacitor voltage reference value and draw error with submodule capacitor voltage meansigma methods, submodule capacitor voltage nargin work difference
Value, described error amount controls to produce active power instruction through PI, and output higher limit is Pmax, lower limit is Pmin。
A kind of mixing three end DC transmission systems of the present invention, unlike conventional multiterminal HVDC transmission system,
Current conversion station B in this mixing three end DC transmission system uses full-bridge modules multilevel converter (FB-MMC) to access weak alternating current
Net, and the control method of a kind of power reverses is proposed based on this system.The method is not required to during realizing power reverses
" to force " DC transmission system to stop transport, but by cooperating between three current conversion stations, wherein current conversion station B is by changing
The reference value direction of active power realizes the reversion of power, this not only avoids the generation of commutation failure fault, and will not be to defeated
Electricity system causes overweight load, it is possible to stability contorting DC current, it is achieved the smooth DC voltage polarity changing current conversion station, complete
Become the online power reverses of current conversion station.
In the full-bridge modules multilevel converter of current conversion station B, topmost two unit are DC current controllers
With submodule capacitor voltage static organ.DC current controller and submodule capacitor voltage static organ are all to export when not actuated
Reference value, adjusts output after startup such that it is able to ensure that control realization steadily switches, then current conversion station B is at three end high-voltage dc transmissions
During electricity system carries out power reverses, it is possible to keep homeostasis, and then assist exchanging circuit station A and C realizes the reverse of power
Convert.
Accompanying drawing explanation
Fig. 1 is mixing three end HVDC transmission system topology diagrams；
Fig. 2 is full-bridge modules multilevel converter control block diagram；
Fig. 3 is mixing three end HVDC transmission system power reverses control flow charts.
Detailed description of the invention
Below in conjunction with the accompanying drawings technical scheme is described in detail.
The invention provides a kind of mixing three end HVDC transmission systems, its topological structure is as it is shown in figure 1, this system bag
Containing three current conversion stations, i.e. current conversion station A, current conversion station B, current conversion station C, three current conversion stations connect three AC systems, Qi Zhonghuan respectively
Stream station B connects a weak ac grid system.Connect and the current conversion station B of weak AC network have employed the many level of full-bridge modulesization change
Stream device (FB-MMC), referred to as FB-MMC current conversion station, current conversion station A and current conversion station B have employed line commutation inverter (LCC), is referred to as
LCC type current conversion station, the current conversion station of LCC type is Large Copacity station, and FB-MMC is low capacity station.This system is branching type structure, three
Current conversion station is connected on same DC transmission line, and system two ends are respectively LCC type current conversion station A and LCC type current conversion station C, respectively
It is connected on branch node by a DC power transmission line, is FB-MMC current conversion station B in the middle of system, by one dividing potential drop of series connection
Resistance R access tributary node.Three current conversion stations are required for configuring smoothing reactor L, and wherein two LCC type current conversion stations also need to configuration
Alternating current filter ACF and DC filter DCF.
Shown in Fig. 2 is the Control system architecture of current conversion station B (FB-MMC type current conversion station), and this current conversion station control system comprises
DC current controller, submodule capacitor voltage balance controller, Outer Loop Power Controller, internal ring current controller, circulation press down
Device processed, valve control etc..
Outer Loop Power Controller is according to active power reference value Pref, reactive power reference qref QrefWith voltage on valve side udqCalculate
Go out watt current reference value and reactive current reference value；Internal ring current controller is according to watt current reference value, reactive current ginseng
Examine value, voltage on valve side udqWith current on valve side idqCalculate FB-MMC builtin voltage；Loop current suppression device is according to DC current IdcWith
The galvanometer of FB-MMC three-phase upper and lower bridge arm calculates the internal uneven pressure drop of FB-MMC.
Under normal circumstances, not starting DC current controller, its input includes: DC current reference value Idcref, unidirectional current
Stream IdcWith current margins Idcmarg, DC current reference value Idcref, current margins IdcmargWith DC current IdcMake difference to be missed
Difference, error is through PI controller output voltage DC component reference value Udcref/2；When DC Line Fault occurs, DC current controller
Input current nargin Idcmarg=0, then DC current reference value Idcref, and DC current IdcMake difference and obtain error, error warp
Crossing PI controller output higher limit and keep constant, lower limit is Udcmin/ 2, it is achieved controller steadily switches.
Under normal circumstances, the input of submodule capacitor voltage balance controller includes: submodule capacitor voltage reference value
Vcref, submodule capacitor voltage meansigma methods VcavgWith voltage margin Vcmarg, when not starting controller, vcen=0, by submodule electricity
Hold voltage reference value VcrefWith submodule capacitor voltage meansigma methods Vcavg, voltage margin VcmargMaking difference and obtain error, error is passed through
PI controller output Pref(i.e. active power reference value) is to Outer Loop Power Controller；When DC Line Fault occurs, start controller
Vcen=1, voltage margin Vcmarg=0, then by submodule capacitor voltage reference value VcrefWith submodule capacitor voltage meansigma methods
VcavgMaking difference and obtain error, error is P through PI controller output higher limitmax, lower limit is Pmin, it is achieved controller steady
Switching.
The control system of LCC type current conversion station is the most highly developed, is the most no longer discussed in detail.
In conjunction with the control flow chart shown in Fig. 3, it is anti-that concrete introduction mixing three end HVDC transmission systems realize power
The control method turned.Owing to FB-MMC type current conversion station connects weak AC system, it is a low capacity station, therefore, at high straightening
Stream transmission system FB-MMC type current conversion station during realizing power reverses, as " auxiliary " current conversion station, needs to keep power
Constant.In the present embodiment, analyze and be reversed to by current conversion station C to current conversion station A and B to current conversion station B and C through-put power by current conversion station A
The control method of through-put power:
After power reverses order starts, first electric current is down to 0.15pu by rectification current conversion station A, and direct voltage reference value is down to
0.2pu, when direct voltage reference value is less than 0.2pu, the rectification state of our station is reset and transmits the signal to by current conversion station A
Inversion current conversion station C；After current conversion station C receives the rectification state reset signal of current conversion station A, DC voltage is down to 0.2pu, afterwards
The inverter mode of our station is reset and by rectified signal set by current conversion station C, then current conversion station C becomes new rectification current conversion station, the change of current
The A that stands becomes new inversion current conversion station, and current conversion station A controls the rated value that DC voltage is reversely increase rapidly up to bear, and current conversion station C controls
DC current is gradually brought to rated value；After current conversion station B receives power reverses order, first reduce active power reference value,
When our station DC current is less than 0.1pu, FB-MMC switching to DC current control model, controlling DC current is 0, works as reception
After completing signal to current conversion station A and C power reverses, FB-MMC is switched to active power controller pattern, control active power ginseng
Examine value to be gradually increased, until system stable operation, then mix the three online power reverses of end HVDC transmission system and complete.
Generally, mix three end HVDC transmission systems to be and above-mentioned comprise two LCC type current conversion stations and one
The system of FB-MMC type current conversion station, wherein LCC type Inverter control DC voltage, LCC type Rectifier control DC current, FB-
MMC type current conversion station controls active power.
When in above-mentioned mixing three end HVDC transmission system, FB-MMC inverter exits, i.e. system only comprises two LCC
During type current conversion station, control mode is then conventional two ends HVDC transmission system control mode.
When above-mentioned mixing three end HVDC transmission system only comprising a LCC type current conversion station and a FB-MMC type changes
During stream station, LCC type current conversion station controls DC voltage, and FB-MMC type current conversion station controls active power.
When only comprising a FB-MMC type current conversion station in above-mentioned mixing three end HVDC transmission system, FB-MMC type changes
Stream station runs on STATCOM state, is only weak current system balance reactive power.
The foregoing is only embodiments of the invention, be not limiting as the present invention, those skilled in the art is come
Saying, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, any amendment of being made, equivalent
Replacement, improvement etc., within should be included in scope of the presently claimed invention.
Claims (3)
1. the power reverses method of mixing three end HVDC transmission systems, it is characterised in that described mixing three end is high
Pressure DC transmission system includes two LCC type current conversion stations and a FB-MMC type current conversion station；Two LCC type current conversion stations are designated as respectively
Current conversion station A and C, FB-MMC type current conversion station is designated as current conversion station B；
If current conversion station A is converting plant, current conversion station C is Inverter Station, after described current conversion station A and C receives inverted command, and current conversion station A
Control to reduce DC current and direct voltage reference value declines, until the rectification state of current conversion station A resets and sent out by reset signal
Give current conversion station C；
After current conversion station C receives described reset signal, control to reduce DC voltage, until current conversion station C inverter mode resets, rectification
Set signal is also sent to current conversion station A by home position signal, controls the rated value that DC current is gradually brought to bear subsequently；
After current conversion station A receives described set signal, control the rated value that DC voltage is reversely increase rapidly up to bear；
After current conversion station B receives inverted command, control to reduce active power reference value, until current conversion station B switches to DC current
Control model, controlling DC current is 0, and after current conversion station A and C completes power reverses, current conversion station B switches to active power mould
Formula, controls to increase active power reference value.
The power reverses method of a kind of mixing the most according to claim 1 three end HVDC transmission systems, its feature exists
In, after described current conversion station A receives inverted command, control DC current and drop to 0.15pu, control DC voltage reference simultaneously
Value drops to 0.2pu；After described current conversion station C receives the reset signal of current conversion station A, control to reduce DC voltage and drop to
0.2pu。
The power reverses method of a kind of mixing the most according to claim 1 three end HVDC transmission systems, its feature exists
In, the full-bridge modules multilevel converter of described current conversion station B includes DC current controller and submodule capacitor voltage balance
Controller, under normal circumstances, described DC current controller output Udcref/ 2 instruct as DC voltage, described submodule electric capacity
Voltage balancing control device output PrefInstruct as active power；
In the case of DC Line Fault, the input of described DC current controller includes: DC current, DC current reference value and electric current are abundant
Degree, described DC current reference value, current margins are poor with DC current work obtains error amount, and described error amount controls to produce through PI
Raw DC voltage instruction, output higher limit is Udcref/ 2, lower limit is Udcmin/2；Described submodule capacitor voltage balance controls
Device input includes: submodule capacitor voltage reference value, submodule capacitor voltage meansigma methods and submodule capacitor voltage nargin, described
Submodule capacitor voltage reference value is made difference with submodule capacitor voltage meansigma methods, submodule capacitor voltage nargin and is drawn error amount,
Described error amount controls to produce active power instruction through PI, and output higher limit is Pmax, lower limit is Pmin。
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| CN107800130A (en) * | 2017-11-06 | 2018-03-13 | 许继电气股份有限公司 | The Poewr control method and system of the more current conversion stations of the active flexible direct current system of multiterminal |
| CN108092298A (en) * | 2017-12-05 | 2018-05-29 | 华北电力大学 | The design method of current conversion station active power reference value in a kind of DC grid |
| CN108808716A (en) * | 2018-06-19 | 2018-11-13 | 西安端怡科技有限公司 | A kind of extra-high voltage Hybrid HVDC system load flow inverts control method online |
| CN110098617A (en) * | 2018-01-29 | 2019-08-06 | 国网浙江省电力有限公司电力科学研究院 | A kind of trend reversion control method of series hybrid DC transmission system |
| CN110429633A (en) * | 2019-08-06 | 2019-11-08 | 许昌许继软件技术有限公司 | A kind of Hybrid HVDC system and its control method |
| CN110649577A (en) * | 2019-07-04 | 2020-01-03 | 中国电力科学研究院有限公司 | Direct-current transmission line protection method and system based on pure current characteristics |
| CN111373648A (en) * | 2017-11-22 | 2020-07-03 | 西门子股份公司 | Energy transmission via a bipolar HVDC transmission line |
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| CN113258597A (en) * | 2021-05-07 | 2021-08-13 | 南方电网科学研究院有限责任公司 | Method and device for controlling bipolar power balance and storage medium |
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| CN107800130B (en) * | 2017-11-06 | 2020-04-14 | 许继电气股份有限公司 | Power control method and system for multi-converter station of multi-terminal active flexible direct current system |
| CN107800130A (en) * | 2017-11-06 | 2018-03-13 | 许继电气股份有限公司 | The Poewr control method and system of the more current conversion stations of the active flexible direct current system of multiterminal |
| CN111448735B (en) * | 2017-11-17 | 2024-05-24 | 超级电力研究所有限公司 | Device for controlling a port for compensating voltage disturbances |
| CN111448735A (en) * | 2017-11-17 | 2020-07-24 | 超级电力研究所有限公司 | Apparatus for controlling port for compensating voltage disturbance |
| CN111373648A (en) * | 2017-11-22 | 2020-07-03 | 西门子股份公司 | Energy transmission via a bipolar HVDC transmission line |
| CN108092298A (en) * | 2017-12-05 | 2018-05-29 | 华北电力大学 | The design method of current conversion station active power reference value in a kind of DC grid |
| CN110098617A (en) * | 2018-01-29 | 2019-08-06 | 国网浙江省电力有限公司电力科学研究院 | A kind of trend reversion control method of series hybrid DC transmission system |
| CN108808716B (en) * | 2018-06-19 | 2021-01-26 | 西安西电电力系统有限公司 | Method for controlling tidal current online reversal of ultra-high voltage hybrid direct current transmission system |
| CN108808716A (en) * | 2018-06-19 | 2018-11-13 | 西安端怡科技有限公司 | A kind of extra-high voltage Hybrid HVDC system load flow inverts control method online |
| CN110649577A (en) * | 2019-07-04 | 2020-01-03 | 中国电力科学研究院有限公司 | Direct-current transmission line protection method and system based on pure current characteristics |
| CN110649577B (en) * | 2019-07-04 | 2021-10-01 | 中国电力科学研究院有限公司 | Direct-current transmission line protection method and system based on pure current characteristics |
| US11973340B2 (en) | 2019-07-04 | 2024-04-30 | China Electric Power Research Institute | Direct-current transmission line protection method and system based on pure current characteristics |
| CN110429633A (en) * | 2019-08-06 | 2019-11-08 | 许昌许继软件技术有限公司 | A kind of Hybrid HVDC system and its control method |
| CN113258597A (en) * | 2021-05-07 | 2021-08-13 | 南方电网科学研究院有限责任公司 | Method and device for controlling bipolar power balance and storage medium |
| CN113258597B (en) * | 2021-05-07 | 2022-02-18 | 南方电网科学研究院有限责任公司 | Method and device for controlling bipolar power balance and storage medium |
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