CN110768284B - Method for restraining direct current commutation failure based on VDCOL additional controller - Google Patents
Method for restraining direct current commutation failure based on VDCOL additional controller Download PDFInfo
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- CN110768284B CN110768284B CN201911060600.6A CN201911060600A CN110768284B CN 110768284 B CN110768284 B CN 110768284B CN 201911060600 A CN201911060600 A CN 201911060600A CN 110768284 B CN110768284 B CN 110768284B
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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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- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The application discloses a method for inhibiting direct current commutation failure based on a VDCOL (virtual digital control loop) additional controller, which comprises the following steps: the VDCOL additional controller calculates reactive power output by the STATCOM to obtain an additional current instruction; the VDCOL controller calculates the direct-current voltage to obtain a first current instruction; and calculating the first current instruction and the additional current instruction to obtain a direct current instruction. In the application, the second current instruction is a fixed value in a certain interval, and can be regulated according to the reactive power output by the STATCOM, and the second direct current output can be controlled by combining the reactive power of the system and the direct voltage, so that the alternating voltage oscillation is effectively inhibited, and the occurrence of continuous commutation failure is prevented.
Description
Technical Field
The application relates to the technical field of direct current transmission, in particular to a method for inhibiting direct current commutation failure based on a VDCOL additional controller.
Background
The high-voltage direct current transmission (Line Commutated Converter High Voltage Direct Current, LCC-HVDC) system based on the grid commutation converter has the advantages of high transmission efficiency, rapid and controllable transmission power and low operation cost, and is widely applied to 'western electric east transmission and national networking' engineering. However, when the receiving end power grid has serious faults, commutation failure may be caused.
The low-voltage current-limiting control strategy (VDCOL) is a common control method for inhibiting commutation failure, and mainly dynamically adjusts the command value of the direct current of a system according to the alternating current or direct current voltage of a fault side (generally an inversion side), so that the turn-off angle of a valve bank of the inversion side is increased to increase the commutation margin, and the continuous commutation failure is inhibited.
However, when the voltage of the traditional VDCOL curve is frequently changed, the direct current is also changed, so that the stability of a direct current system is not facilitated, the combined control with the reactive power output of a STATCOM is not performed, the alternating voltage is easy to continue to oscillate, and the unstable alternating voltage is easy to cause commutation failure. Therefore, a method for suppressing direct current commutation failure based on the VDCOL additional controller is proposed.
Disclosure of Invention
The application provides a method for restraining direct current commutation failure based on a VDCOL additional controller, which aims to solve the technical problem of commutation failure in a high-voltage direct current transmission system.
In order to solve the technical problems, the embodiment of the application discloses the following technical scheme:
the method for inhibiting direct current commutation failure based on the VDCOL additional controller comprises the steps of: the VDCOL additional controller calculates reactive power output by the STATCOM to obtain an additional current instruction; the VDCOL controller calculates the direct-current voltage to obtain a first current instruction; and calculating the first current instruction and the additional current instruction to obtain a direct current instruction.
Optionally, the VDCOL additional controller calculates reactive power output by the STATCOM to obtain an additional current instruction, including: the VDCOL additional controller calculates reactive power output by the STATCOM by using the formula (1) to obtain an additional current instruction;
wherein Q is STATCOM Representing reactive power output by STATCOM, I add Representing an additional current command.
Optionally, the calculating the first current command and the additional current command to obtain a direct current command includes: adding the first current instruction and the additional current instruction to obtain a second current instruction; and performing logic operation on the second current instruction to obtain a direct current instruction.
Optionally, the direct current command is less than 1.
Alternatively, the logical operation is a fetch operation.
The beneficial effects are that: the application provides a method for inhibiting direct current commutation failure based on a VDCOL additional controller, which comprises the following steps of: the VDCOL additional controller calculates reactive power output by the STATCOM to obtain an additional current instruction; the VDCOL controller calculates the direct-current voltage to obtain a first current instruction; and calculating the first current instruction and the additional current instruction to obtain a direct current instruction. In the application, the second current instruction is a fixed value in a certain interval, and can be regulated according to the reactive power output by the STATCOM, and the second direct current output can be controlled by combining the reactive power of the system and the direct voltage, so that the alternating voltage oscillation is effectively inhibited, and the occurrence of continuous commutation failure is prevented.
Drawings
In order to more clearly illustrate the technical solution of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a flow chart of a method for suppressing DC commutation failure based on a VDCOL additional controller provided by the application;
fig. 2 is a schematic diagram of a method for suppressing dc commutation failure based on a VDCOL additional controller.
Detailed Description
FIG. 1 is a flow chart of a method for suppressing DC commutation failure based on a VDCOL additional controller provided by the application;
FIG. 2 is a schematic diagram of a method for suppressing DC commutation failure based on a VDCOL additional controller provided by the application; referring to fig. 1 and 2, it can be seen that the present application provides a method for suppressing dc commutation failure based on a VDCOL additional controller, including the VDCOL additional controller and the VDCOL controller, the method includes:
s01: and the VDCOL additional controller calculates reactive power output by the STATCOM to obtain an additional current instruction.
The VDCOL additional controller utilizes the formula (1) to output reactive power Q to the STATCOM STATCOM Calculating to obtain additional current instruction I add ；
Wherein Q is STATCOM Representing reactive power output by STATCOM, I add Representing an additional current command. Q (Q) STATCOM >When 0, the output of the STATCOM is capacitive reactive; q (Q) STATCOM <At 0, the STATCOM output is inductively reactive.
S02: the VDCOL controller calculates the direct current voltage to obtain a first current instruction.
S03: and calculating the first current instruction and the additional current instruction to obtain a direct current instruction.
S031: first current instruction I VDCOL And additional current instruction I add Adding to obtain a second current instruction I ref 。
S032: second current instruction I ref Performing logic operation to obtain a direct current instruction I order 。
Direct current instruction I order Less than 1, the logical operation is a fetch operation. The small operation is to select the smallest input quantity in the multiple input quantities by using the MIN module. In use, the second current instruction I ref And 1 are respectively input into a MIN module to carry out a small-taking operation to obtain a direct current instruction I smaller than 1 order 。
In the application, reactive power Q STATCOM Additional current command I add DC voltage U dc Second current instruction I ref And direct current instruction I order All expressed in terms of per unit value.
The application provides a method for inhibiting direct current commutation failure based on a VDCOL additional controller, which comprises the following steps of: the VDCOL additional controller calculates reactive power output by the STATCOM to obtain an additional current instruction; the VDCOL controller calculates the direct-current voltage to obtain a first current instruction; and calculating the first current instruction and the additional current instruction to obtain a direct current instruction. In the application, the second current instruction is a fixed value in a certain interval, and can be regulated according to the reactive power output by the STATCOM, and the second direct current output can be controlled by combining the reactive power of the system and the direct voltage, so that the alternating voltage oscillation is effectively inhibited, and the occurrence of continuous commutation failure is prevented.
Since the foregoing embodiments are all described in other modes by reference to the above, the same parts are provided between different embodiments, and the same and similar parts are provided between the embodiments in the present specification. And will not be described in detail herein.
It should be noted that in this specification, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such circuit structure, article, or apparatus. Without further limitation, the statement "comprises" or "comprising" a … … "does not exclude that an additional identical element is present in a circuit structure, article or apparatus that comprises the element.
Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
The embodiments of the present application described above do not limit the scope of the present application.
Claims (4)
1. The method for suppressing direct current commutation failure based on the VDCOL additional controller is characterized by comprising the VDCOL additional controller and the VDCOL controller, and comprises the following steps:
the VDCOL additional controller calculates reactive power output by the STATCOM to obtain an additional current instruction, including:
the VDCOL additional controller calculates reactive power output by the STATCOM by using the formula (1) to obtain an additional current instruction;
wherein Q is STATCOM Representing reactive power output by STATCOM, I add Representing an additional current command;
the VDCOL controller calculates the direct-current voltage to obtain a first current instruction;
and calculating the first current instruction and the additional current instruction to obtain a direct current instruction.
2. The method of claim 1, wherein the calculating the first current command and the additional current command to obtain a direct current command comprises:
the first current instruction and the additional current instruction are added to obtain a second current instruction;
and performing logic operation on the second current instruction to obtain a direct current instruction.
3. The method of claim 2, wherein the direct current command is less than 1.
4. The method of claim 2, wherein the logical operation is a fetch operation.
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| CN201911060600.6A CN110768284B (en) | 2019-11-01 | 2019-11-01 | Method for restraining direct current commutation failure based on VDCOL additional controller |
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| CN201911060600.6A CN110768284B (en) | 2019-11-01 | 2019-11-01 | Method for restraining direct current commutation failure based on VDCOL additional controller |
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| CN110768284B true CN110768284B (en) | 2023-09-15 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111245001B (en) * | 2020-02-25 | 2022-06-24 | 东南大学 | Additional current control-based direct current continuous commutation failure suppression method |
| CN111711220B (en) * | 2020-06-28 | 2022-02-15 | 国网湖南省电力有限公司 | Phase modulator transient voltage control method for controlling VDCL output based on direct current transmission |
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| CN109921399A (en) * | 2019-03-25 | 2019-06-21 | 中国电力科学研究院有限公司 | The control method and device of sending end power network overvoltage during a kind of inhibition commutation failure |
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