CN110768284A - Method for inhibiting direct current commutation failure based on VDCOL additional controller - Google Patents

Method for inhibiting direct current commutation failure based on VDCOL additional controller Download PDF

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CN110768284A
CN110768284A CN201911060600.6A CN201911060600A CN110768284A CN 110768284 A CN110768284 A CN 110768284A CN 201911060600 A CN201911060600 A CN 201911060600A CN 110768284 A CN110768284 A CN 110768284A
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vdcol
additional
current instruction
direct current
current
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CN110768284B (en
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邢超
何鑫
刘明群
李胜男
奚鑫泽
徐志
杨蕾
和鹏
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Electric Power Research Institute of Yunnan Power System Ltd
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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
    • 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
    • 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
    • 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]
    • 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)
  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

The application discloses a method for suppressing direct current commutation failure based on a VDCOL additional controller, which comprises the VDCOL additional controller and the VDCOL controller, and the method comprises the following steps: the VDCOL additional controller calculates the reactive power output by the STATCOM to obtain an additional current instruction; the VDCOL controller calculates a 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, the second current instruction can be adjusted according to the reactive power output by the STATCOM, and the control of the output of the second direct current can be carried out by combining the reactive power of the system and the direct voltage, so that the oscillation of the alternating voltage is effectively inhibited, and the occurrence of continuous commutation failure is prevented.

Description

Method for inhibiting direct current commutation failure based on VDCOL additional controller
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
A high-voltage Direct Current (LCC-HVDC) system based on a power grid commutation Converter has the advantages of high transmission efficiency, rapid and controllable transmission power and low operation cost, and is widely applied to the projects of 'West-east power transmission and national networking'. However, when the receiving-end power grid has a serious fault, a commutation failure phenomenon may be caused.
A low-voltage current-limiting control strategy (VDCOL) is a common control method for suppressing phase commutation failure, and mainly dynamically adjusts a command value of a system direct current according to an alternating current or direct current voltage of a fault side (generally, an inverter side), so that a turn-off angle of an inverter side valve bank is increased to increase a phase commutation margin, and the occurrence of continuous phase commutation failure is suppressed.
However, according to the conventional VDCOL curve, when the voltage changes frequently, the direct current also changes all the time, which is not favorable for the stability of a direct current system, and the direct current is not jointly controlled with the reactive output of the STATCOM, so that the alternating current voltage is easy to continue to oscillate, and the instability of the alternating current voltage is easy to cause phase change failure. Therefore, a method for suppressing the direct current commutation failure based on the additional controller of the VDCOL is proposed.
Disclosure of Invention
The application provides a method for inhibiting direct current commutation failure based on a VDCOL additional controller, and aims to solve the technical problem of commutation failure in a high-voltage direct current power transmission system.
In order to solve the technical problem, the embodiment of the application discloses the following technical scheme:
a method for suppressing direct current commutation failure based on a VDCOL additional controller comprises the VDCOL additional controller and the VDCOL controller, and comprises the following steps: the VDCOL additional controller calculates the reactive power output by the STATCOM to obtain an additional current instruction; the VDCOL controller calculates a 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 the reactive power output by the STATCOM to obtain an additional current instruction, including: the VDCOL additional controller calculates the reactive power output by the STATCOM by using a formula (1) to obtain an additional current instruction;
Figure BDA0002257837490000011
wherein Q isSTATCOMRepresenting reactive power of the STATCOM output, IaddIndicating an additional current command.
Optionally, the calculating the first current command and the additional current command to obtain the direct current command includes: adding the first current command and the additional current command to obtain a second current command; and performing logic operation on the second current instruction to obtain a direct current instruction.
Optionally, the direct current command is less than 1.
Optionally, the logical operation is a small operation.
Has the advantages that: the application provides a method for suppressing direct current commutation failure based on a VDCOL additional controller, which comprises the VDCOL additional controller and the VDCOL controller, and the method comprises the following steps: the VDCOL additional controller calculates the reactive power output by the STATCOM to obtain an additional current instruction; the VDCOL controller calculates a 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, the second current instruction can be adjusted according to the reactive power output by the STATCOM, and the control of the output of the second direct current can be carried out by combining the reactive power of the system and the direct voltage, so that the oscillation of the alternating voltage is effectively inhibited, and the occurrence of continuous commutation failure is prevented.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
FIG. 1 is a flowchart of a method for suppressing a DC commutation failure based on a VDCOL additional controller provided by the application;
FIG. 2 is a schematic diagram of a method for suppressing a DC commutation failure based on a VDCOL additional controller provided by the application.
Detailed Description
FIG. 1 is a flowchart of a method for suppressing a DC commutation failure based on a VDCOL additional controller provided in the present application;
FIG. 2 is a schematic diagram of a method for suppressing a DC commutation failure based on a VDCOL additional controller provided by the present application; referring to fig. 1 and fig. 2, it can be seen that the present application provides a method for suppressing a dc commutation failure based on a VDCOL additional controller, including the VDCOL additional controller and the VDCOL controller, where the method includes:
s01: and the VDCOL additional controller calculates the reactive power output by the STATCOM to obtain an additional current instruction.
The VDCOL additional controller utilizes the formula (1) to adjust the reactive power Q output by the STATCOMSTATCOMCalculating to obtain an additional current instruction Iadd；
Figure BDA0002257837490000021
Wherein Q isSTATCOMRepresenting reactive power of the STATCOM output, IaddIndicating an additional current command. QSTATCOM>When 0, the STATCOM outputs capacitive reactive power; qSTATCOM<At 0, it represents STThe output of the ATCOM is inductive reactive power.
S02: the VDCOL controller calculates a direct current voltage to obtain a first current command.
S03: and calculating the first current instruction and the additional current instruction to obtain a direct current instruction.
S031: first current command IVDCOLAnd an additional current command IaddAdding to obtain a second current command Iref。
S032: second current command IrefPerforming logic operation to obtain DC instruction Iorder。
Direct current command IorderLess than 1, the logical operation is a small operation. The minimum operation is to select the minimum input quantity of the input quantities by using the MIN module. In use, the second current command IrefAnd 1 are respectively input into an MIN module to carry out small-size calculation to obtain a direct current instruction I less than 1order。
In this application, reactive power QSTATCOMAdditional current command IaddDC voltage UdcA second current command IrefAnd a DC current command IorderAre expressed by per unit values.
The application provides a method for suppressing direct current commutation failure based on a VDCOL additional controller, which comprises the VDCOL additional controller and the VDCOL controller, and the method comprises the following steps: the VDCOL additional controller calculates the reactive power output by the STATCOM to obtain an additional current instruction; the VDCOL controller calculates a 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, the second current instruction can be adjusted according to the reactive power output by the STATCOM, and the control of the output of the second direct current can be carried out by combining the reactive power of the system and the direct voltage, so that the oscillation of the alternating voltage is effectively inhibited, and the occurrence of continuous commutation failure is prevented.
Since the above embodiments are all described by referring to and combining with other embodiments, the same portions are provided between different embodiments, and the same and similar portions between the various embodiments in this specification may be referred to each other. And will not be described in detail herein.
It is 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. Also, 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 presence of an element identified by the phrase "comprising an … …" does not exclude the presence of other like elements in a circuit structure, article or device comprising the element.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention 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 invention 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 above-described embodiments of the present application do not limit the scope of the present application.

Claims (5)

1. The method for suppressing the 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 the reactive power output by the STATCOM to obtain an additional current instruction;
the VDCOL controller calculates a 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 VDCOL additional controller calculates the reactive power output by the STATCOM to obtain an additional current command, comprising:
the VDCOL additional controller calculates the reactive power output by the STATCOM by using a formula (1) to obtain an additional current instruction;
Figure FDA0002257837480000011
wherein Q isSTATCOMRepresenting reactive power of the STATCOM output, IaddIndicating an additional current command.
3. The method of claim 1, wherein calculating the first current command and the additional current command to obtain a direct current command comprises:
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.
4. The method of claim 3, wherein the DC current command is less than 1.
5. The method of claim 3, wherein the logical operation is a small operation.
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CN111245001A (en) * 2020-02-25 2020-06-05 东南大学 Additional current control-based direct current continuous commutation failure suppression method
CN111711220A (en) * 2020-06-28 2020-09-25 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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CN111245001A (en) * 2020-02-25 2020-06-05 东南大学 Additional current control-based direct current continuous commutation failure suppression method
CN111245001B (en) * 2020-02-25 2022-06-24 东南大学 Additional current control-based direct current continuous commutation failure suppression method
CN111711220A (en) * 2020-06-28 2020-09-25 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
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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