CN106487033A - Conversion method and system for converting full voltage into half voltage operation in hybrid direct current transmission system - Google Patents
Conversion method and system for converting full voltage into half voltage operation in hybrid direct current transmission system Download PDFInfo
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- CN106487033A CN106487033A CN201611161671.1A CN201611161671A CN106487033A CN 106487033 A CN106487033 A CN 106487033A CN 201611161671 A CN201611161671 A CN 201611161671A CN 106487033 A CN106487033 A CN 106487033A
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- 238000010586 diagram Methods 0.000 description 8
- 238000002955 isolation Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 3
- 230000036772 blood pressure Effects 0.000 description 3
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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 embodiment of the invention provides a conversion method for converting full voltage into half voltage operation in a hybrid direct-current transmission system, relates to the field of direct-current transmission of a power system, and can realize stable and quick conversion from full voltage into half voltage operation. The specific scheme comprises the following steps: when determining that one pole needs to carry out full-pressure to half-pressure operation, sending a switching command to a valve bank of which the sending end and the receiving end need to quit through inter-station communication; the first valve bank reduces the pressure and operates to zero after receiving the conversion command; indicating a high-speed bypass switch corresponding to the first valve bank to be closed, and indicating to lock the first valve bank; the second valve bank shifts the phase after receiving the switching command; and turning on a bypass pair of the second valve bank, indicating that a high-speed bypass switch corresponding to the second valve bank is closed, and indicating to lock the second valve bank. The invention is used for converting full voltage operation into half voltage operation in the hybrid direct current transmission system.
Description
Technical field
Embodiments of the invention are related to power system direct current transportation field, in more particularly, to a kind of Hybrid HVDC system
Total head turns conversion method and the system that half pressure is run.
Background technology
Flexible DC power transmission has the advantages that to improve electric network composition, no commutation failure risk, raising operation security and stability,
Customary DC transmission of electricity has the advantages that loss low, low cost, conveyance capacity are strong.Sending end adopts customary DC, receiving end using flexible
The extra-high voltage Hybrid HVDC system of direct current can be in combination with the advantage of customary DC and flexible direct current, in remote conveying
Electric field has preferable application prospect in closing.
In order to reduce the voltage stress of primary equipment, need to connect using high and low valve group in extra-high voltage DC transmission system
Connection type.When certain valve group of a pole is exited due to fault or maintenance, this pole needs to be run by total head and is converted to half
Pressure is run.Because flexible direct current converter valve and customary DC converter valve have very big difference in control characteristic, therefore existing extra-high
In pressure customary DC transmission system, half pressure conversion method inapplicable is turned using total head.
Content of the invention
In a kind of embodiments of the invention Hybrid HVDC system of offer, total head turns the conversion method of half pressure operation and is
System, can realize total head in Hybrid HVDC system and turn steady, the rapid translating that half pressure is run.
In order to reach above-mentioned purpose, embodiments herein adopts the following technical scheme that：
In a first aspect, providing total head in a kind of Hybrid HVDC system to turn the conversion method that half pressure is run, including：
When determining that a pole needs to carry out total head and turns half pressure and run, by station between communicate to sending the valve group that need to be exited by two ends
Send conversion command；
First valve group after receiving described conversion command brownout operation to zero, described first valve group need to exit for receiving end
Valve group；Indicate that the corresponding high speed by-pass switch of described first valve group closes, determining the bypass of described first valve group corresponding high speed
After switch closure, the first valve group described in instruction locking；
The phase shift after receiving described conversion command of second valve group, the valve group that described second valve group need to exit for sending end；?
After determining that described second valve group phase shift puts in place, the bypass turning on described second valve group is right, and indicates that described second valve group is corresponding
High speed by-pass switch closes, after determining described second valve group corresponding high speed by-pass switch closure, second described in instruction locking
Valve group.
Second aspect, provides total head in a kind of Hybrid HVDC system to turn the converting system that half pressure is run, for executing
The method that first aspect is provided.
In the Hybrid HVDC system that embodiments of the invention are provided, total head turns the conversion method of half pressure operation and is
System, when a certain pole needs to carry out total head and turns half pressure and run, the flexible direct current inverter of receiving end successively reduction of blood pressure in high-speed run, closure
High speed by-pass switch, locking valve group；The customary DC inverter of sending end successively quick phase shift, to put into bypass other at a high speed to, closure
Way switch, locking valve group；Achieve total head in Hybrid HVDC system and turn steady, the rapid translating that half pressure is run.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, embodiment will be described below
In required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only the present invention some
Embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also be attached according to these
Figure obtains other accompanying drawings.
Fig. 1 is the explanation schematic diagram of extra-high voltage Hybrid HVDC system；
Fig. 2 is schematic diagram when extra-high voltage Hybrid HVDC system half pressure is run；
Fig. 3 is the connection diagram of LCC and bypass circuit in extra-high voltage Hybrid HVDC system；
Fig. 4 is the connection diagram of MMC and bypass circuit in extra-high voltage Hybrid HVDC system；
In the Hybrid HVDC system that Fig. 5 is provided by embodiments of the invention, total head turns the conversion method that half pressure is run
Schematic flow sheet；
Fig. 6 is that in embodiments of the invention, total head is turned with the control timing diagram that half pressure is run；
In the Hybrid HVDC system that Fig. 7 is provided by embodiments of the invention, total head turns the converting system that half pressure is run
Structural representation.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of not making creative work
Embodiment, broadly falls into the scope of protection of the invention.
Below in conjunction with accompanying drawing of the present invention, technical scheme is illustrated.
Embodiments of the invention provide total head in a kind of Hybrid HVDC system to turn the conversion method that half pressure is run, this reality
Apply in example and illustrate in case of Hybrid HVDC system is for extra-high voltage Hybrid HVDC system.Fig. 1 is extra-high
Pressure Hybrid HVDC system schematic, direct-current transmission voltage grade is extra-high voltage.The each pole of sending end A is by two 12 pulsation electricity
Net commutation inverter (English full name：Line commutated converter, English abbreviation：LCC) in series, near straight
The LCC102 of stream transmission line of electricity 101 is referred to as high-end valve group, and the LCC104 near earthing pole 103-1 is referred to as low side valve group；Each
12 pulsation LCC are moved by two six kinds of pulses that LCC is in series, and two six kinds of pulses move LCC to be passed through the transformator 105 of AC and exchange system
System connection.The each pole of receiving end B is by two modularization multi-level converter (English full name：modular multilevel
Converter, English abbreviation：MMC) in series, it is referred to as high-end valve group near the MMC106 of DC power transmission line 101, close
The MMC107 of earthing pole 103-2 is referred to as low side valve group；Each MMC is in series by large number of submodule；Two MMC lead to
The transformator 108 crossing AC is coupled with AC system.
Fig. 2 is the schematic diagram under extra-high voltage Hybrid HVDC system half pressure is run.Taking positive pole as a example, when positive pole certain
When valve group is exited due to fault or maintenance, positive pole only remains next one valve group 102 and puts into operation, is run by total head and is converted to half
Pressure is run.
Fig. 3 is LCC and bypass circuit connection diagram in extra-high voltage Hybrid HVDC system.Transformator 105 is connected with
AC circuit breaker 109.In order to realize exiting of valve group, need for each valve group configure bypass circuit, this bypass circuit with existing
Bypass circuit in extra-high voltage customary DC power transmission engineering is basically identical.Bypass circuit is mainly by high speed by-pass switch 301 (English
Full name：Bypass Switch, English abbreviation：BPS), isolation switch 302, by-pass knife switch 303 are constituted.The effect of BPS is quick
The valve group that bypass need to be exited, and turn offer current path in the transformation process of half pressure in total head.The effect of by-pass knife switch is complete
After the completion of pressure turns half pressure, electric current is transferred to by-pass knife switch by BPS.The effect of isolation switch is the valve group that isolation has dropped out.
Fig. 4 is MMC and bypass circuit connection diagram in extra-high voltage Hybrid HVDC system.Transformator 108 is connected with
AC circuit breaker 110.In order to realize exiting of valve group, need for each valve group configure bypass circuit, this bypass circuit with existing
Bypass circuit in extra-high voltage customary DC power transmission engineering is basically identical.Bypass circuit is mainly by high speed BPS401, isolation switch
402nd, by-pass knife switch 403 is constituted.The effect of high speed BPS is quickly to bypass the valve group that need to exit, and turns the conversion of half pressure in total head
During provide current path.The effect of by-pass knife switch is after the completion of total head turns half pressure, and electric current is transferred to side by high speed BPS
Road disconnecting link.The effect of isolation switch is the valve group that isolation has dropped out.
In conjunction with shown in Fig. 5, in Hybrid HVDC system, total head turns the conversion method that half pressure runs and comprises the following steps：
501st, when determining that a pole needs to carry out total head and turns half pressure and run, by station between communicate and need to be exited by two ends to sending
Valve group sends conversion command.
502nd, start receiving end conversion timing sequence.
In the present embodiment, the valve group that receiving end need to be exited is referred to as the first valve group.Receiving end conversion timing sequence includes：First valve group exists
Receive after conversion command brownout operation to zero.Then indicate that the first valve group corresponding high speed by-pass switch closes, determining the
After one valve group corresponding high speed by-pass switch closure, indicate locking first valve group.
Receiving end forms a pole, the high-end valve group of receiving end and low side valve group by high-end valve group and low side valve group in DC side series connection
For MMC, the first valve group is specially MMC.High speed by-pass switch is the high-speed circuit breaker of valve group DC side parallel, need to move back for bypass
The valve group going out, and current path is provided.By its function and performance requirement and existing extra-high voltage customary DC power transmission engineering high speed
Way switch is basically identical.
503rd, start sending end conversion timing sequence.
In the present embodiment, the valve group that sending end need to be exited is referred to as the second valve group.Sending end conversion timing sequence includes：Second valve group exists
Receive phase shift after conversion command, after determining that the second valve group phase shift puts in place, the bypass of conducting the second valve group is right, and indicates second
Valve group corresponding high speed by-pass switch closes, after determining the second valve group corresponding high speed by-pass switch closure, instruction locking the
Two valve groups.
Sending end forms a pole, the high-end valve group of sending end and low side valve group by high-end valve group and low side valve group in DC side series connection
For LCC, the second valve group is specially LCC.Bypass to for be connected in LCC same exchange phase a pair of thyristor valve, its definition with
Existing extra-high voltage customary DC power transmission engineering is consistent.
In conjunction with shown in Fig. 6, taking exit the high-end valve group of positive pole as a example, the sequential that total head is turned with half pressure operation illustrates.Fig. 6
In the concrete time scale that marks be only and illustrate, for distinguishing the precedence of event generation.
In a kind of specific embodiment, controlled by station or pole control issues instruction and exits the instruction of positive pole high-end valve group.
Receiving end receives this instruction, is zero by the DC voltage control of high-end for positive pole valve group immediately, and the BPS to this valve group
Send close command.Subsequently sending end by urgent for high-end for positive pole valve group phase shift thus rapid by the unidirectional current of high-end for sending end positive pole valve group
Near pressure drop as little as zero.Treat the high-end valve group phase shift of sending end positive pole to larger angle, such as 80 °, then conducting bypass is right immediately, and to should
The BPS of valve group sends close command.
After high-end valve group BPS of sending end positive pole is of completely closed, the high-end valve group of locking sending end positive pole.
After high-end valve group BPS of receiving end positive pole is of completely closed, the high-end valve group of locking receiving end positive pole.
So far send and successfully exited by the high-end valve group of two ends positive pole.Then close by-pass knife switch, after by-pass knife switch closure, break
Open BPS, DC current is transferred to by-pass knife switch by BPS.After BPS disconnects, disconnect isolation switch, thus the valve that isolation has dropped out
Group.So far the transformation process being turned half pressure by two ends positive pole total head is sent to be fully completed.
In the Hybrid HVDC system that embodiments of the invention are provided, total head turns the conversion method that half pressure is run, at certain
When one pole needs to carry out total head and turns half pressure and run, the flexible direct current inverter of receiving end successively reduction of blood pressure in high-speed run, closure other at a high speed
Way switch, locking valve group；The customary DC inverter of sending end successively quick phase shift, put into bypass to, closure high speed by-pass switch,
Locking valve group；Achieve total head in Hybrid HVDC system and turn steady, the rapid translating that half pressure is run.
Embodiments of the invention also provide total head in a kind of Hybrid HVDC system to turn the converting system that half pressure is run, and use
In the conversion method described in execution above-described embodiment, in conjunction with shown in Fig. 7, this converting system includes：Controller 701, first
Valve group 702, the second valve group 703 and the first valve group 702 and each self-corresponding high speed by-pass switch of the second valve group 703.Wherein
The valve group that one valve group 702 need to exit for receiving end, the valve group that the second valve group 703 need to exit for sending end.In Fig. 7, the first valve group 702 is right
The high speed by-pass switch 704 answered is identified with 705 with 704 marks, the corresponding high speed by-pass switch of the second valve group 703.
Controller 701, for when determining that a pole needs to carry out total head and turns half pressure and run, by station between communicate to sending by two
The valve group that end need to be exited sends conversion command.
First valve group 702, for brownout operation after receiving conversion command to zero, the first valve group 702 need to be moved back for receiving end
The valve group going out.
Controller 701, is additionally operable to indicate that the corresponding high speed by-pass switch 704 of the first valve group 702 closes, and is determining the first valve
After organizing 702 corresponding high speed by-pass switch 704 closures, indicate locking the first valve group 702.
Second valve group 703, the valve group that need to exit for sending end for phase shift after receiving conversion command, the second valve group 703.
Controller 701, is additionally operable to after determining that the second valve group 703 phase shift puts in place, the bypass of conducting the second valve group 703 is right,
And indicate that the corresponding high speed by-pass switch 705 of the second valve group 703 closes, open determining that the corresponding high speed of the second valve group 703 bypasses
After closing 705 closures, indicate locking the second valve group 703.
Optionally, the first valve group is specially MMC, and the second valve group is specially LCC.
Optionally, send, by two ends, one pole is formed in DC side series connection by high-end valve group and low side valve group.The height of wherein sending end
End valve group and low side valve group are LCC, and the high-end valve group of receiving end and low side valve group are MMC.
Optionally, high speed by-pass switch is the high-speed circuit breaker of valve group DC side parallel, for bypassing the valve group that need to exit,
And current path is provided.
Optionally, bypass is to a pair of thyristor valve for being connected to same exchange phase in LCC.
In the Hybrid HVDC system that embodiments of the invention are provided, total head turns the converting system that half pressure is run, at certain
When one pole needs to carry out total head and turns half pressure and run, the flexible direct current inverter of receiving end successively reduction of blood pressure in high-speed run, closure other at a high speed
Way switch, locking valve group；The customary DC inverter of sending end successively quick phase shift, put into bypass to, closure high speed by-pass switch,
Locking valve group；Achieve total head in Hybrid HVDC system and turn steady, the rapid translating that half pressure is run.
More than, the specific embodiment of the only present invention, but protection scope of the present invention is not limited thereto, any it is familiar with
Those skilled in the art the invention discloses technical scope in, change or replacement can be readily occurred in, all should cover
Within protection scope of the present invention.Therefore, protection scope of the present invention should be defined by scope of the claims.
Claims (10)
1. in a kind of Hybrid HVDC system, total head turns the conversion method of half pressure operation it is characterised in that including：
When determining that a pole needs to carry out total head and turns half pressure and run, by station between communicate to sending the valve group that need to be exited by two ends to send
Conversion command；
First valve group after receiving described conversion command brownout operation to zero, the valve that described first valve group need to exit for receiving end
Group；Indicate that the corresponding high speed by-pass switch of described first valve group closes, open determining that the corresponding high speed of described first valve group bypasses
After closing closure, the first valve group described in instruction locking；
The phase shift after receiving described conversion command of second valve group, the valve group that described second valve group need to exit for sending end；Determining
After described second valve group phase shift puts in place, the bypass turning on described second valve group is right, and indicates the corresponding high speed of described second valve group
By-pass switch closes, after determining described second valve group corresponding high speed by-pass switch closure, the second valve group described in instruction locking.
2. conversion method according to claim 1 it is characterised in that
Described first valve group is specially modularization multi-level converter MMC；
Described second valve group is specially line commutation inverter LCC.
3. conversion method according to claim 2 it is characterised in that
Send, by two ends, one pole is formed in DC side series connection by high-end valve group and low side valve group；
Wherein the high-end valve group of sending end and low side valve group are LCC, and the high-end valve group of receiving end and low side valve group are MMC.
4. conversion method according to claim 2 it is characterised in that
High speed by-pass switch is the high-speed circuit breaker of valve group DC side parallel, for bypassing the valve group that need to exit, and provides electric current
Path.
5. conversion method according to claim 2 it is characterised in that
Described bypass is to a pair of thyristor valve for being connected to same exchange phase in LCC.
6. in a kind of Hybrid HVDC system, total head turns the converting system of half pressure operation it is characterised in that including：Controller,
First valve group, the second valve group and described first valve group and each self-corresponding high speed by-pass switch of described second valve group；Wherein institute
State the valve group that the first valve group need to exit, the valve group that described second valve group need to exit for sending end for receiving end；
Described controller, for when determining that a pole needs to carry out total head and turns half pressure and run, by station between communicate to sending by two ends
The valve group that need to exit sends conversion command；
Described first valve group, for brownout operation after receiving described conversion command to zero, described first valve group needs for receiving end
The valve group exiting；
Described controller, is additionally operable to indicate that the corresponding high speed by-pass switch of described first valve group closes, is determining described first valve
After organizing corresponding high speed by-pass switch closure, the first valve group described in instruction locking；
Described second valve group, the valve that need to exit for sending end for phase shift after receiving described conversion command, described second valve group
Group；
Described controller, is additionally operable to after determining that described second valve group phase shift puts in place, the bypass turning on described second valve group is right, and
Indicate that the corresponding high speed by-pass switch of described second valve group closes, close in the determination corresponding high speed by-pass switch of described second valve group
After conjunction, the second valve group described in instruction locking.
7. converting system according to claim 6 it is characterised in that
Described first valve group is specially modularization multi-level converter MMC；
Described second valve group is specially line commutation inverter LCC.
8. converting system according to claim 7 it is characterised in that
Send, by two ends, one pole is formed in DC side series connection by high-end valve group and low side valve group；
Wherein the high-end valve group of sending end and low side valve group are LCC, and the high-end valve group of receiving end and low side valve group are MMC.
9. converting system according to claim 7 it is characterised in that
High speed by-pass switch is the high-speed circuit breaker of valve group DC side parallel, for bypassing the valve group that need to exit, and provides electric current
Path.
10. converting system according to claim 7 it is characterised in that
Described bypass is to a pair of thyristor valve for being connected to same exchange phase in LCC.
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| CN201611161671.1A CN106487033A (en) | 2016-12-15 | 2016-12-15 | Conversion method and system for converting full voltage into half voltage operation in hybrid direct current transmission system |
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| CN107453388A (en) * | 2017-09-20 | 2017-12-08 | 南方电网科学研究院有限责任公司 | Valve bank ESOF control method of hybrid direct-current transmission system and hybrid direct-current transmission system |
| CN108923451A (en) * | 2018-07-23 | 2018-11-30 | 南方电网科学研究院有限责任公司 | Method and device for controlling extra-high voltage multi-end hybrid direct current device to overhaul valve bank to exit |
| CN109494780A (en) * | 2018-11-19 | 2019-03-19 | 全球能源互联网研究院有限公司 | A kind of DC transmission system power turns for method and system |
| WO2019161907A1 (en) * | 2018-02-23 | 2019-08-29 | Abb Schweiz Ag | Energization of a converter including a mix of half-bridge and full-bridge submodules |
| CN110729749A (en) * | 2019-11-15 | 2020-01-24 | 南方电网科学研究院有限责任公司 | Method for realizing quick conversion of ground return wire and metal return wire by using half-bridge MMC structure |
| CN110829481A (en) * | 2019-11-15 | 2020-02-21 | 南方电网科学研究院有限责任公司 | Method for realizing rapid conversion of ground return wire and metal return wire by using full-bridge MMC structure |
| CN112054489A (en) * | 2020-07-31 | 2020-12-08 | 中国电力科学研究院有限公司 | System and method for protecting extra-high voltage direct current receiving end multi-drop point subordinate direct current line in series connection mode |
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| CN110829481A (en) * | 2019-11-15 | 2020-02-21 | 南方电网科学研究院有限责任公司 | Method for realizing rapid conversion of ground return wire and metal return wire by using full-bridge MMC structure |
| CN112054489A (en) * | 2020-07-31 | 2020-12-08 | 中国电力科学研究院有限公司 | System and method for protecting extra-high voltage direct current receiving end multi-drop point subordinate direct current line in series connection mode |
| CN112054489B (en) * | 2020-07-31 | 2023-08-15 | 中国电力科学研究院有限公司 | System and method for protecting extra-high voltage direct current receiving end multi-drop-point lower-level direct current line in series connection mode |
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