CN104600736A - Automatic switching system for flexible direct-current power transmission active control mode - Google Patents
Automatic switching system for flexible direct-current power transmission active control mode Download PDFInfo
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- CN104600736A CN104600736A CN201510011355.5A CN201510011355A CN104600736A CN 104600736 A CN104600736 A CN 104600736A CN 201510011355 A CN201510011355 A CN 201510011355A CN 104600736 A CN104600736 A CN 104600736A
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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 discloses an automatic switching system for a flexible direct-current power transmission active control mode. The automatic switching system specifically comprises an expected value setter, a first direct-current voltage closed-loop control module, a first active power closed-loop control module, a second direct-current voltage closed-loop control module, a second active power closed-loop control module, a first control outer loop selector and a second control outer loop selector, wherein through the expected value setter as well as rectifying or inverting information, the first direct-current voltage closed-loop control module of a rectifier 1, the first active power closed-loop control module and the second direct-current voltage closed-loop control module of a rectifier 2 are determined; the second active power closed-loop control module has a respective active power expected value and a direct-current voltage expected value; a converter 1 is selected to adopt active power control or direct-current voltage control through the first control outer loop selector; a converter 2 is selected to adopt active power control or direct-current voltage control through the second control outer loop selector, so that the automatic identification of the active control mode of the back-to-back flexible direct-current power transmission system is realized.
Description
Technical field
The invention belongs to power electronics control technology field, particularly relate to a kind of real power control pattern automatic switchover system for flexible direct-current transmission control system back-to-back.
Background technology
Flexible direct current power transmission system rely on its have active reactive can independent regulation, without the need to jumbo reactive power compensation and filter, there will not be commutation failure, receiving end to be connected to the advantages such as passive system, be mainly used in the occasions such as grid-connected power generation system networking, asynchronous electrical network connection.Along with the development of electricity market, the flexible DC power transmission back-to-back between regional power grid is interconnected is the preferred plan solving electricity market real-time deal problem between the control of trend between regional power grid, regional power grid.
Chinese patent application 201110244817.X (application number) describes a kind of back-to-back testing method of flexible DC power transmission MMC valve Tests at Steady State, and existing method is mostly the problem that the steady operation basic function paying close attention to flexible DC power transmission realizes.But about the control model of flexible direct current power transmission system, what describe in detail is less.
Summary of the invention
The technical problem to be solved in the present invention: provide the system that a kind of real power control pattern automatically switches, to realize the automatic switchover of active power outer shroud and direct voltage outer shroud.
For the ease of understanding the technical scheme of the application, first the device relevant to the system that the application's real power control pattern automatically switches simply is described below:
In flexible direct current power transmission system, adopt modularization multi-level converter as primary system equipment, modularization multi-level converter (MMC1, MMC2) is made up of 6 brachium pontis, and each brachium pontis is in series by a reactor 2L and N number of submodule.MMC circuit height modularization, can meet different power and electric pressure requirement by the submodule quantity of increase and decrease access converter, be convenient to realize Integration Design, shorten the project cycle, cost-saving.
The modulation system that the current decoupled control of what the first current inner loop and valve level controller 3, second current inner loop and valve level controller 4 mainly realized is two converters and recently level approach, eventually through Fiber connection on respective converter.Current decoupled control is and the three-phase current of actual samples is carried out coordinate transform, under being converted to DQ coordinate system, the current value after controlling the given reference value of outer shroud and converting being done difference, delivers in PI controller, finally export modulating wave; The modulation system that nearest level approaches is, and by dropping into or exiting submodule, the voltage that device is exported is close to modulating wave waveform.
System-level control centre 6 relates generally to the overall meritorious and idle cooperation control at MMC1, MMC2 two station, and it needs active power desired value P needed for system
ref, direct voltage desired value U
dcrefand inversion/rectification information is issued in real power control pattern automatic switchover system 5.
The present invention is concrete by the following technical solutions:
A kind of flexible DC power transmission real power control pattern automatic switchover system, comprises desired value setting apparatus 7, first direct voltage closed loop control module 8, first active power close loop control module 9, second direct voltage closed loop control module 10, second active power close loop control module 11, first and controls outer shroud selector 12 and the second control outer shroud selector 13; It is characterized in that:
The direct current system active power desired value P that the system-level control centre 6 that described desired value setting apparatus 7 receives flexible direct current power transmission system issues
ref, direct voltage desired value U
dcref, and the rectification of flexible direct-current transmission system converter station or inversion information;
Described desired value setting apparatus 7 generates the first direct voltage desired value Udc of flexible direct current power transmission system first end current conversion station
ref1with the first direct current system active power desired value P
ref1be issued to the first direct voltage closed loop control module 8 and the first active power close loop control module 9 respectively;
Described desired value setting apparatus 7 generates the second direct voltage desired value Udc of flexible direct current power transmission system other end current conversion station
ref2with the second direct current system active power desired value P
ref2be issued to the second direct voltage closed loop control module 10 and the second active power close loop control module 11 respectively;
The first direct voltage desired value Udc that described first direct voltage closed loop control module 8 will receive
ref1as the direct voltage desired value of flexible direct current power transmission system first end current conversion station, generate the 3rd current expected value Id with after the local terminal DC bus d. c. voltage signal passing ratio integral control of actual acquisition
ref3;
The first active power desired value P that described first active power close loop control module 9 will receive
ref1the first current expected value Id is generated as after the active power signal passing ratio integral control of the active power desired value of flexible direct current power transmission system first end current conversion station and the local terminal current conversion station of actual acquisition
ref1;
The second direct voltage desired value Udc that described second direct voltage closed loop control module 10 will receive
ref2as the direct voltage desired value of flexible direct current power transmission system other end current conversion station, generate the 4th current expected value Id with after this end DC bus d. c. voltage signal passing ratio integral control of actual acquisition
ref4;
The second active power desired value P that second active power close loop control module 11 will receive
ref2as the active power desired value of flexible direct current power transmission system other end current conversion station, generate the second current expected value Id with after the active power signal passing ratio integral control of this end current conversion station of actual acquisition
ref2;
Described first controls outer shroud selector 12 receives the 3rd current expected value Id
ref3with the first current expected value Id
ref1, after selecting to distribute, by the first current expected value Id
ref1or the 3rd current expected value Id
ref3as the first current inner loop of corresponding flexible direct current power transmission system first end current conversion station and the input signal of valve level controller 3;
Described second controls outer shroud selector 13 receives the 4th current expected value Id
ref4with the second current expected value Id
ref2, after selecting to distribute, by the second current expected value Id
ref2or the 4th current expected value Id
ref4as the second current inner loop of corresponding flexible direct current power transmission system other end current conversion station and the input signal of valve level controller 4.
The present invention is further preferred following scheme also:
As the active power desired value P that the system-level control centre 6 that described desired value setting apparatus 7 receives issues
reffor negative i.e. first end current conversion station be converting plant and other end current conversion station is Inverter Station time, desired value setting apparatus 7 generates and is issued to the first direct voltage desired value Udc of the first direct voltage closed loop control module 8, first active power close loop control module 9, second direct voltage closed loop control module 10, second active power close loop control module 11 respectively
ref1, the first direct current system active power desired value P
ref1, the second direct voltage desired value Udc
ref2, the second direct current system active power desired value P
ref2as follows respectively:
P
ref1＝|P
ref|+detaP
Udc
ref1＝Udc
ref
P
ref2＝P
ref
Udc
ref2＝0.9Udc
ref
In formula, detaP=0.1P
n, P
nfor the rated power of flexible direct current power transmission system;
As the active power desired value P that the system-level control centre 6 that described desired value setting apparatus 7 receives issues
reffor just namely first end current conversion station be Inverter Station and other end current conversion station is converting plant time, desired value setting apparatus 7 generates and is issued to the first direct voltage desired value Udc of the first direct voltage closed loop control module 8, first active power close loop control module 9, second direct voltage closed loop control module 10, second active power close loop control module 11 respectively
ref1, the first direct current system active power desired value P
ref1, the second direct voltage desired value Udc
ref2, the second direct current system active power desired value P
ref2as follows respectively:
P
ref1＝-P
ref
Udc
ref1＝0.9Udc
ref
P
ref2＝|P
ref|+detaP
Udc
ref2＝Udc
ref
In formula, detaP=0.1P
n, P
nfor the rated power of flexible direct current power transmission system.
When the first end current conversion station judging flexible direct current power transmission system is converting plant, described first controls outer shroud selector 12 selects the first current expected value Id
ref1with the 3rd current expected value Id
ref3middle smaller is as the input signal of the first current inner loop and valve level controller 3;
When the first end current conversion station judging direct current transportation is Inverter Station, described first controls outer shroud selector 12 selects the first current expected value Id
ref1with the 3rd current expected value Id
ref3middle the greater is as the input signal of the first current inner loop and valve level controller 3;
When the other end current conversion station judging direct current transportation is converting plant, described second controls outer shroud selector 13 selects the second current expected value Id
ref2with the 4th current expected value Id
ref4middle smaller is as the input signal of the second current inner loop and valve level controller 4;
When the other end current conversion station judging direct current transportation is Inverter Station, described second controls outer shroud selector 13 selects the second current expected value Id
ref2with the 4th current expected value Id
ref4middle the greater is as the input signal of the second current inner loop and valve level controller 4.
Beneficial effect of the present invention:
The invention provides a kind of method that real power control pattern automatically switches, by given first direct voltage closed loop control module 8, first active power close loop control module 9, second direct voltage closed loop control module 10, second active power close loop control module 11 active power desired value and the direct voltage desired value of desired value setting apparatus 7, and then control outer shroud selector 12 and the second control outer shroud selector 13 by first, realize the automatic identification of flexible direct current power transmission system real power control pattern back-to-back.
Accompanying drawing illustrates:
Fig. 1 is real power control pattern automatic switchover system structural representation of the present invention;
Fig. 2-1 is the present invention first active power close loop modular structure schematic diagram;
Fig. 2-2 is the present invention second active power close loop modular structure schematic diagrames;
Fig. 3-1 is the present invention first direct voltage closed loop modular structure schematic diagram;
Fig. 3-2 is the present invention second direct voltage closed loop modular structure schematic diagrames;
Fig. 4 is desired value setting apparatus structural representation of the present invention;
Fig. 5 is desired value distributor function schematic diagram of the present invention;
Fig. 6 is that the present invention first controls outer shroud selector functional schematic;
Fig. 7 is that the present invention second controls outer shroud selector functional schematic.
Embodiment
For making technical scheme of the present invention, controlling advantage definitely, below in conjunction with accompanying drawing, detailed explanation explanation being done to the present invention.
Embodiments provide a kind of system based on the real power control pattern automatic switchover of flexible direct current power transmission system back-to-back, achieve the automatic switchover of active power outer shroud and direct voltage outer shroud.The introduction of the embodiment of the present invention adopts two topological structures based on modularization multi-level converter (see Fig. 1) based on main circuit, it comprises MMC1, MMC2, the first current inner loop and valve level controller 3, second current inner loop and valve level controller 4, real power control pattern automatic switchover system 5 and system-level control centre 6.
In flexible direct current power transmission system, adopt modularization multi-level converter as primary system equipment, modularization multi-level converter (MMC1, MMC2) is made up of 6 brachium pontis, and each brachium pontis is in series by a reactor 2L and N number of submodule.MMC circuit height modularization, can meet different power and electric pressure requirement by the submodule quantity of increase and decrease access converter, be convenient to realize Integration Design, shorten the project cycle, cost-saving.
The modulation system that the current decoupled control of what the first current inner loop and valve level controller 3, second current inner loop and valve level controller 4 mainly realized is two converters and recently level approach, eventually through Fiber connection on respective converter.Current decoupled control is and the three-phase current of actual samples is carried out coordinate transform, under being converted to DQ coordinate system, the current value after controlling the given reference value of outer shroud and converting being done difference, delivers in PI controller, finally export modulating wave; The modulation system that nearest level approaches is, and by dropping into or exiting submodule, the voltage that device is exported is close to modulating wave waveform.
System-level control centre 6 relates generally to the overall meritorious and idle cooperation control at MMC1, MMC2 two station, and it needs there is active power desired value P needed for system
ref, direct voltage desired value U
dcrefand inversion/rectification information is issued in real power control pattern automatic switchover system 5.
Real power control pattern automatic switchover system 5 comprises desired value setting apparatus 7, first direct voltage closed loop control module 8, first active power close loop control module 9, second direct voltage closed loop control module 10, second active power close loop control module 11, first and controls outer shroud selector 12 and the second control outer shroud selector 13.
Desired value setting apparatus 7 (see Fig. 4) comprises desired value receiver 26, desired value distributor 27.
Desired value receiver 26 is the active power desired value P that issues of receiving system level control centre 6 mainly
ref, direct voltage desired value is Udc
ref; Simultaneously to active power desired value P
refthere is minimum power requirement, namely | P
ref|>=0.1P
n, P
nfor the specified active power of DC transmission system, expression active power desired value is minimum is 10% rated power; Desired value receiver 26 is by the active power desired value P after process
refwith direct voltage desired value Udc
refbe handed down to desired value distributor 27;
Desired value distributor 27 (see Fig. 5) comprises determines meritorious power difference (detaP) module 28, judges that active power expects that positive and negative module 29, first determines that active power is expected and direct voltage module 30, second determines that active power is expected and direct voltage module 31;
Describedly determine that meritorious power difference (detaP) module 28 mainly determines the active power difference of two current conversion stations, thus determine power flow direction, that is:
detaP＝0.1P
N
Described judgement active power expects that positive and negative module 29 is P
ref>=0.1P
norP
ref≤-0.1P
n, judge the active power desired value p of the direct current system that system-level control centre 6 issues
refbe more than or equal to minimum power 0.1P
nstill-0.1P is less than or equal to
n.
Described first determines that active power is expected and direct voltage module 30, mainly the active power desired value that system-level control centre 6 issues for negative i.e. first end current conversion station be converting plant and other end current conversion station is Inverter Station time, determine the desired value being finally issued to the first direct voltage closed loop control module 8, first active power close loop control module 9, second direct voltage closed loop control module 10, second active power close loop control module 11, that is:
P
ref1＝|P
ref|+detaP
Udc
ref1＝Udc
ref
P
ref2＝P
ref
Udc
ref2＝0.9Udc
ref
Described second determines that active power is expected and direct voltage module 31, mainly the active power desired value that system-level control centre 6 issues for just namely first end current conversion station be Inverter Station and other end current conversion station is converting plant time, determine the desired value being finally issued to the first direct voltage closed loop control module 8, first active power close loop control module 9, second direct voltage closed loop control module 10, second active power close loop control module 11, that is:
P
ref1＝-P
ref
Udc
ref1＝0.9Udc
ref
P
ref2＝|P
ref|+detaP
Udc
ref2＝Udc
ref
For current conversion station 1 first active power close loop control module 9 (see Fig. 2-1), desired value setting apparatus 7 issues active power desired value P
ref1subtracted each other by subtracter 15 with the actual active power of output of converter 1 of device 14 after filtering, then enter PI controller 16, output is the first current expected value Id
ref1, be one of the input of current inner loop;
For current conversion station 2 second active power close loop control module 11 (see Fig. 2-2), desired value setting apparatus 7 issues active power desired value P
ref2subtracted each other by subtracter 18 with the actual active power of output of converter 2 of device 17 after filtering, then enter PI controller 19, output is the second current expected value Id
ref2, be one of the input of current inner loop;
For current conversion station 1 first direct voltage closed loop control module 8 (see Fig. 3-1), desired value setting apparatus 7 issues direct voltage desired value Udc
ref1subtracted each other by subtracter 21 with the DC bus actual DC voltage of device 20 after filtering, then enter PI controller 22, output is the 3rd current expected value Id
ref3;
For current conversion station 2 second direct voltage closed loop control module 10 (see Fig. 3-2), desired value setting apparatus 7 issues direct voltage desired value Udc
ref2subtracted each other by subtracter 24 with the DC bus actual DC voltage of device 23 after filtering, then enter PI controller 25, output is the 4th current expected value Id
ref4;
Illustrate as follows for PI controller 16, PI controller 19, PI controller 22, PI controller 25:
The transfer function of PI controller is:
Wherein, K is proportional gain, and T is integration time constant.Proportional gain K and integration time constant T needs to adjust according to actual conditions, such as, hardware parameter, major loop structure etc., to those skilled in the art, PI controller is common conventional closed loop controller, in the proportional plus integral control of flexible DC power transmission, according to the gain of actual conditions resize ratio and the time of integration general knowledge be customary means, the application repeats no more.
Described first controls outer shroud selector 12 (see Fig. 6), comprises inversion or rectification judge module 32, first electric current expectation selector 33 and the second electric current and expects selector 34; Inversion or rectification judge module 32 are issued to the inversion of our station according to system-level control centre 6 or rectification information judges that the converter of both sides, direct current pole is Inverter Station or converting plant;
When the current conversion station judging direct current transportation is converting plant, described second electric current expects that Id selected by selector 34
ref1and Id
ref3middle smaller is as the input of the first current inner loop and valve level controller 3;
When the current conversion station judging direct current transportation is Inverter Station, described first electric current expects that Id selected by selector 33
ref1and Id
ref3middle the greater is as the input of the first current inner loop and valve level controller 3.
Described second controls outer shroud selector 13 (see Fig. 7), comprises inversion or rectification judge module 35, the 3rd electric current expectation selector 36 and the 4th electric current expectation selector 37; Inversion or rectification judge module 35 are issued to the inversion of our station according to system-level control centre 6 or rectification information judges that the converter of both sides, direct current pole is Inverter Station or converting plant;
When the current conversion station judging direct current transportation is converting plant, described 4th electric current expects that Id selected by selector 37
ref2and Id
ref4middle smaller controls the input of 4 as the second current inner loop and valve level;
When the current conversion station judging direct current transportation is Inverter Station, described 3rd electric current expects that Id selected by selector 36
ref2and Id
ref4middle the greater controls the input of 4 as the second current inner loop and valve level.
Claims (4)
1. a flexible DC power transmission real power control pattern automatic switchover system, it is characterized in that: the direct current system active power desired value that described flexible DC power transmission real power control pattern automatic switchover system receiving system level control centre issues and direct voltage desired value, according to the rectification of flexible DC power transmission two ends current conversion station or the control signal of inversion Information Selection generation two ends current conversion station.
2. a flexible DC power transmission real power control pattern automatic switchover system, comprises desired value setting apparatus (7), the first direct voltage closed loop control module (8), the first active power close loop control module (9), the second direct voltage closed loop control module (10), the second active power close loop control module (11), the first control outer shroud selector (12) and the second control outer shroud selector (13); It is characterized in that:
The direct current system active power desired value P that the system-level control centre (6) that described desired value setting apparatus (7) receives flexible direct current power transmission system issues
ref, direct voltage desired value U
dcref, and the rectification of flexible direct-current transmission system converter station or inversion information;
Described desired value setting apparatus (7) generates the first direct voltage desired value Udc of flexible direct current power transmission system first end current conversion station
ref1with the first direct current system active power desired value P
ref1be issued to the first direct voltage closed loop control module (8) and the first active power close loop control module (9) respectively;
Described desired value setting apparatus (7) generates the second direct voltage desired value Udc of flexible direct current power transmission system other end current conversion station
ref2with the second direct current system active power desired value P
ref2be issued to the second direct voltage closed loop control module (10) and the second active power close loop control module (11) respectively;
The first direct voltage desired value Udc that described first direct voltage closed loop control module (8) will receive
ref1as the direct voltage desired value of flexible direct current power transmission system first end current conversion station, generate the 3rd current expected value Id with after the local terminal DC bus d. c. voltage signal passing ratio integral control of actual acquisition
ref3;
The first active power desired value P that described first active power close loop control module (9) will receive
ref1the first current expected value Id is generated as after the active power signal passing ratio integral control of the active power desired value of flexible direct current power transmission system first end current conversion station and the local terminal current conversion station of actual acquisition
ref1;
The second direct voltage received is expected Udc by described second direct voltage closed loop control module (10)
ref2as the direct voltage desired value of flexible direct current power transmission system other end current conversion station, generate the 4th current expected value Id with after this end DC bus d. c. voltage signal passing ratio integral control of actual acquisition
ref4;
The second active power desired value P that second active power close loop control module (11) will receive
ref2as the active power desired value of flexible direct current power transmission system other end current conversion station, generate the second current expected value Id with after the active power signal passing ratio integral control of this end current conversion station of actual acquisition
ref2;
Described first controls outer shroud selector (12) receives the 3rd current expected value Id
ref3with the first current expected value Id
ref1, after selecting to distribute, by the first current expected value Id
ref1or the 3rd current expected value Id
ref3as the first current inner loop of corresponding flexible direct current power transmission system first end current conversion station and the input signal of valve level controller (3);
Described second controls outer shroud selector (13) receives the 4th current expected value Id
ref4with the second current expected value Id
ref2, after selecting to distribute, by the second current expected value Id
ref2or the 4th current expected value Id
ref4as the second current inner loop of corresponding flexible direct current power transmission system other end current conversion station and the input signal of valve level controller (4).
3. flexible DC power transmission real power control pattern automatic switchover system according to claim 2, is characterized in that:
As the active power desired value P that the system-level control centre (6) that described desired value setting apparatus (7) receives issues
reffor negative i.e. first end current conversion station be converting plant and other end current conversion station is Inverter Station time, desired value setting apparatus (7) generates and is issued to the first direct voltage desired value Udc of the first direct voltage closed loop control module (8), the first active power close loop control module (9), the second direct voltage closed loop control module (10), the second active power close loop control module (11) respectively
ref1, the first direct current system active power desired value P
ref1, the second direct voltage desired value Udc
ref2, the second direct current system active power desired value P
ref2as follows respectively:
P
ref1＝|P
ref|+detaP
Udc
ref1＝Udc
ref
P
ref2＝P
ref
Udc
ref2＝0.9Udc
ref
In formula, detaP=0.1P
n, P
nfor the rated power of flexible direct current power transmission system;
As the active power desired value P that the system-level control centre (6) that described desired value setting apparatus (7) receives issues
reffor just namely first end current conversion station be Inverter Station and other end current conversion station is converting plant time, desired value setting apparatus (7) generates and is issued to the first direct voltage desired value Udc of the first direct voltage closed loop control module (8), the first active power close loop control module (9), the second direct voltage closed loop control module (10), the second active power close loop control module (11) respectively
ref1, the first direct current system active power desired value P
ref1, the second direct voltage desired value Udc
ref2, the second direct current system active power desired value P
ref2as follows respectively:
P
ref1＝-P
ref
Udc
ref1＝0.9Udc
ref
P
ref2＝|P
ref|+detaP
Udc
ref2＝Udc
ref
In formula, detaP=0.1P
n, P
nfor the rated power of flexible direct current power transmission system.
4. the flexible DC power transmission real power control pattern automatic switchover system according to Claims 2 or 3, is characterized in that:
When the first end current conversion station judging flexible direct current power transmission system is converting plant, described first controls outer shroud selector (12) selects the first current expected value Id
ref1with the 3rd current expected value Id
ref3middle smaller is as the input signal of the first current inner loop and valve level controller (3);
When the first end current conversion station judging direct current transportation is Inverter Station, described first controls outer shroud selector (12) selects the first current expected value Id
ref1with the 3rd current expected value Id
ref3middle the greater is as the input signal of the first current inner loop and valve level controller (3);
When the other end current conversion station judging direct current transportation is converting plant, described second controls outer shroud selector (13) selects the second current expected value Id
ref2with the 4th current expected value Id
ref4middle smaller is as the input signal of the second current inner loop and valve level controller (4);
When the other end current conversion station judging direct current transportation is Inverter Station, described second controls outer shroud selector (13) selects the second current expected value Id
ref2with the 4th current expected value Id
ref4middle the greater is as the input signal of the second current inner loop and valve level controller (4).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106936141A (en) * | 2015-12-30 | 2017-07-07 | 国网辽宁省电力有限公司电力科学研究院 | The active power controller method and its control system of a kind of flexible ring net controller |
| CN109787265A (en) * | 2019-01-31 | 2019-05-21 | 中国能源建设集团天津电力设计院有限公司 | A kind of flexible HVDC transmission system control method for coordinating stabilized new energy and go out fluctuation |
| WO2022205092A1 (en) * | 2021-03-31 | 2022-10-06 | 华为数字能源技术有限公司 | Grid-connected power supply system, and related device thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106936141A (en) * | 2015-12-30 | 2017-07-07 | 国网辽宁省电力有限公司电力科学研究院 | The active power controller method and its control system of a kind of flexible ring net controller |
| CN106936141B (en) * | 2015-12-30 | 2020-10-13 | 国网辽宁省电力有限公司电力科学研究院 | Active power control method and control system of flexible ring network controller |
| CN109787265A (en) * | 2019-01-31 | 2019-05-21 | 中国能源建设集团天津电力设计院有限公司 | A kind of flexible HVDC transmission system control method for coordinating stabilized new energy and go out fluctuation |
| CN109787265B (en) * | 2019-01-31 | 2022-11-01 | 中国能源建设集团天津电力设计院有限公司 | Flexible direct-current transmission system coordination control method for stabilizing new energy output fluctuation |
| WO2022205092A1 (en) * | 2021-03-31 | 2022-10-06 | 华为数字能源技术有限公司 | Grid-connected power supply system, and related device thereof |
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| CN104600736B (en) | 2016-12-07 |
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Inventor after: Ou Kaijian Inventor after: Wen Jing Inventor after: Guo Haiping Inventor after: Zhang Shaoxun Inventor after: Guo Qi Inventor after: Zhang Haitang Inventor after: Lin Xuehua Inventor after: Chen Li Inventor before: Ou Kaijian Inventor before: Wen Jing Inventor before: Guo Haiping Inventor before: Zhang Shaoxun Inventor before: Guo Qi Inventor before: Zhang Haitang Inventor before: Lin Xuehua Inventor before: Chen Li |