CN110635502A - Method for inhibiting commutation failure of LCC-HVDC system - Google Patents

Method for inhibiting commutation failure of LCC-HVDC system Download PDF

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CN110635502A
CN110635502A CN201910977653.8A CN201910977653A CN110635502A CN 110635502 A CN110635502 A CN 110635502A CN 201910977653 A CN201910977653 A CN 201910977653A CN 110635502 A CN110635502 A CN 110635502A
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commutation
voltage
statcom
lcc
time area
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CN110635502B (en
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邢超
刘明群
李胜男
何鑫
奚鑫泽
徐志
和鹏
何廷一
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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
    • 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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  • Power Engineering (AREA)
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Abstract

The application discloses a method for inhibiting commutation failure of an LCC-HVDC system, wherein a STATCOM additional controller calculates direct current, commutation angle and commutation busbar voltage of the LCC-HVDC system to obtain actual commutation current time area; the actual commutation current time area is differed from the theoretical commutation current area to obtain commutation current time area deviation; converting the time area deviation of the phase change current into voltage deviation; the STATCOM calculates the voltage deviation, the actual commutation bus voltage and the theoretical commutation bus voltage to obtain reactive power; and regulating the voltage of the commutation bus by reactive power. When a commutation failure occurs in the system, the actual commutation current time area is larger than the theoretical commutation current area, the larger the commutation current time area deviation is, the larger the voltage is, the higher the STATCOM alternating current voltage instruction value rising speed is accelerated, the supporting capability of the alternating current system voltage is enhanced, and the capability of the LCC-HVDC system for resisting the commutation failure is improved.

Description

Method for inhibiting commutation failure of LCC-HVDC system
Technical Field
The application relates to the technical field of direct current transmission, in particular to a method for inhibiting commutation failure of an LCC-HVDC system.
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. Static Synchronous compensators (STATCOM) can support ac voltages by rapidly adjusting the reactive power. Therefore, the STATCOM is considered to be installed on the LCC-HVDC inversion side alternating current bus to regulate the voltage of the alternating current bus, so that the phase change failure is restrained.
The existing method for inhibiting commutation failure of the LCC-HVDC system is to install a STATCOM on an alternating current bus at an inverter side of the LCC-HVDC system to regulate the bus voltage. The specific process for inhibiting commutation failure of the LCC-HVDC system is as follows: the STATCOM utilizes the outer ring voltage and the inner ring current to control the voltage of the commutation bus, so that the transient voltage stability of the LCC-HVDC system is improved, and the commutation condition of the LCC-HVDC system is improved.
However, in the existing suppression method, commutation failure is mostly suppressed by respectively designing control strategies, and interactive control between the STATCOM and the LCC-HVDC system converter stations is rarely considered, so that the commutation failure probability of the LCC-HVDC system is higher. Therefore, a method for suppressing commutation failure of an LCC-HVDC system is proposed.
Disclosure of Invention
The application provides a method for inhibiting commutation failure of an LCC-HVDC system, which aims to solve the technical problem of high probability of commutation failure in the existing method for inhibiting commutation failure of the LCC-HVDC system.
In order to solve the technical problem, the embodiment of the application discloses the following technical scheme:
a method of suppressing commutation failure in an LCC-HVDC system including a STATCOM additional controller and a STATCOM, the method comprising: the STATCOM additional controller calculates the direct current, the commutation angle and the commutation bus voltage of the LCC-HVDC system to obtain the actual commutation current time area; the STATCOM additional controller makes a difference between the actual commutation current time area and the theoretical commutation current area to obtain commutation current time area deviation; the STATCOM additional controller converts the commutation current time area deviation into voltage deviation; the STATCOM calculates the voltage deviation, the actual commutation bus voltage and the theoretical commutation bus voltage to obtain reactive power; the STATCOM regulates the converter bus voltage through reactive power.
Optionally, the STATCOM additional controller calculates an actual commutation current time area from the direct current, the commutation angle, and the commutation bus voltage of the LCC-HVDC system, and includes: the STATCOM additional controller calculates the direct current, the commutation angle and the voltage of the commutation bus through a formula (1) to obtain the actual commutation current time area;
Figure BDA0002234166360000011
wherein A isrealRepresenting the actual commutation current time area; i isdRepresents the direct current of the LCC-HVDC system; u shape1Representing the converter bus voltage of the LCC-HVDC system; mu represents a commutation angle of the LCC-HVDC system; γ represents an arc-extinguishing angle; xrRepresenting commutation impedance; α represents a firing angle.
Optionally, before the STATCOM additional controller calculates the actual commutation current time area from the direct current, the commutation angle, and the commutation bus voltage of the LCC-HVDC system, the method further includes: the STATCOM additional controller obtains direct current, a commutation angle and commutation bus voltage of the LCC-HVDC system.
Optionally, the STATCOM calculates the voltage, the actual commutation bus voltage, and the theoretical commutation bus voltage to obtain the reactive power, and includes: the STATCOM adds the voltage and the actual commutation bus voltage, and subtracts the theoretical commutation bus voltage to obtain a voltage difference; and the STATCOM converts the voltage difference through PI to obtain reactive power.
Optionally, the STATCOM additional controller converts the commutation current time area deviation into a voltage, comprising: and the STATCOM additional controller converts the commutation current time area deviation through PI to obtain voltage deviation.
Has the advantages that: the application provides a method for inhibiting commutation failure of an LCC-HVDC system, which comprises the following steps that firstly, a STATCOM additional controller calculates direct current, commutation angle and commutation busbar voltage of the LCC-HVDC system to obtain actual commutation current time area; secondly, the STATCOM additional controller makes a difference between the actual commutation current time area and the theoretical commutation current area to obtain commutation current time area deviation; thirdly, converting the commutation current time area deviation into a voltage deviation by the STATCOM additional controller; then, the STATCOM calculates the voltage deviation, the actual commutation bus voltage and the theoretical commutation bus voltage to obtain reactive power; finally, the STATCOM regulates the commutation bus voltage through reactive power. When the LCC-HVDC system has a commutation failure, the actual commutation current time area is larger than the theoretical commutation current area, the commutation current time area deviation is larger than zero, the voltage is larger than zero, and the larger the commutation current time area deviation is, the larger the voltage is, the higher the STATCOM alternating voltage instruction value rising speed is accelerated, the supporting capability of the alternating system voltage is enhanced, and the capability of the LCC-HVDC system for resisting the commutation failure is improved. Meanwhile, the input signal of the STATCOM additional controller considers the operation condition of the direct current system, the dynamic setting of the STATCOM fixed alternating current voltage instruction value is realized, and the adaptability of the STATCOM under different operation modes of the system is improved.
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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 commutation failure of an LCC-HVDC system.
Detailed Description
Referring to fig. 1, a flowchart of a method for suppressing a commutation failure of an LCC-HVDC system is provided, and it can be seen that the present application provides a method for suppressing a commutation failure of an LCC-HVDC system, including a STATCOM additional controller and a STATCOM, and the method includes:
s01: and the STATCOM additional controller calculates the direct current, the commutation angle and the commutation bus voltage of the LCC-HVDC system to obtain the actual commutation current time area.
Before the STATCOM additional controller calculates the actual commutation current time area, the direct current, the commutation angle and the commutation bus voltage of the LCC-HVDC system need to be obtained.
The STATCOM additional controller calculates the direct current, the commutation angle and the voltage of the commutation bus through a formula (1) to obtain the actual commutation current time area;
Figure BDA0002234166360000021
wherein A isrealRepresenting the actual commutation current time area; i isdRepresents the direct current of the LCC-HVDC system; u shape1Representing the converter bus voltage of the LCC-HVDC system; mu represents a commutation angle of the LCC-HVDC system; γ represents an arc-extinguishing angle; xrRepresenting commutation impedance; α represents a firing angle.
S02: and the STATCOM additional controller makes a difference between the actual commutation current time area and the theoretical commutation current area to obtain the commutation current time area deviation.
S03: the STATCOM additional controller converts the commutation current time area deviation into a voltage deviation.
And the STATCOM additional controller converts the commutation current time area deviation through PI to obtain voltage deviation.
S04: and the STATCOM calculates the voltage deviation, the actual commutation bus voltage and the theoretical commutation bus voltage to obtain the reactive power.
S041: and the STATCOM adds the voltage deviation and the actual commutation bus voltage, and subtracts the theoretical commutation bus voltage to obtain the voltage difference.
S042: and the STATCOM converts the voltage difference through PI to obtain reactive power.
S05: the STATCOM regulates the converter bus voltage through reactive power.
The application provides a method for inhibiting commutation failure of an LCC-HVDC system, which comprises the following steps that firstly, a STATCOM additional controller calculates direct current, commutation angle and commutation busbar voltage of the LCC-HVDC system to obtain actual commutation current time area; secondly, the STATCOM additional controller makes a difference between the actual commutation current time area and the theoretical commutation current area to obtain commutation current time area deviation; thirdly, converting the commutation current time area deviation into a voltage deviation by the STATCOM additional controller; then, the STATCOM calculates the voltage deviation, the actual commutation bus voltage and the theoretical commutation bus voltage to obtain reactive power; finally, the STATCOM regulates the commutation bus voltage through reactive power. When the LCC-HVDC system has a commutation failure, the actual commutation current time area is larger than the theoretical commutation current area, the commutation current time area deviation is larger than zero, the voltage is larger than zero, and the larger the commutation current time area deviation is, the larger the voltage is, the higher the STATCOM alternating voltage instruction value rising speed is accelerated, the supporting capability of the alternating system voltage is enhanced, and the capability of the LCC-HVDC system for resisting the commutation failure is improved. Meanwhile, the input signal of the STATCOM additional controller considers the operation condition of the direct current system, the dynamic setting of the STATCOM fixed alternating current voltage instruction value is realized, and the adaptability of the STATCOM under different operation modes of the system is improved.
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. A method of suppressing commutation failure in an LCC-HVDC system comprising a STATCOM additional controller and a STATCOM, the method comprising:
the STATCOM additional controller calculates the direct current, the commutation angle and the commutation bus voltage of the LCC-HVDC system to obtain the actual commutation current time area;
the STATCOM additional controller makes a difference between the actual commutation current time area and the theoretical commutation current area to obtain commutation current time area deviation;
the STATCOM additional controller converts the commutation current time area deviation into a voltage deviation;
the STATCOM calculates the voltage deviation, the actual commutation bus voltage and the theoretical commutation bus voltage to obtain reactive power;
and the STATCOM regulates the voltage of the commutation bus through the reactive power.
2. The method of claim 1, wherein the STATCOM additional controller calculates an actual commutation current time area from the direct current, the commutation angle, and the commutation busbar voltage of the LCC-HVDC system, comprising:
the STATCOM additional controller calculates the direct current, the commutation angle and the voltage of the commutation bus through a formula (1) to obtain the actual commutation current time area;
Figure FDA0002234166350000011
wherein A isrealRepresenting the actual commutation current time area; i isdRepresents the direct current of the LCC-HVDC system; u shape1Representing the converter bus voltage of the LCC-HVDC system; mu represents a commutation angle of the LCC-HVDC system; γ represents an arc-extinguishing angle; xrRepresenting commutation impedance; α represents a firing angle.
3. The method of claim 1, wherein before the STATCOM additional controller calculates the actual commutation current time area from the dc current, the commutation angle, and the commutation busbar voltage of the LCC-HVDC system, the method further comprises:
and the STATCOM additional controller acquires direct current, a commutation angle and a commutation bus voltage of the LCC-HVDC system.
4. The method of claim 1, wherein the STATCOM calculates the voltage, the actual converter bus voltage, and the theoretical converter bus voltage to obtain the reactive power, and comprises:
the STATCOM adds the voltage and the actual commutation bus voltage, and subtracts the theoretical commutation bus voltage to obtain a voltage difference;
and the STATCOM converts the voltage difference through PI to obtain reactive power.
5. The method of claim 1, wherein the STATCOM additional controller converts the commutation current time area deviation to a voltage deviation comprising:
and the STATCOM additional controller converts the commutation current time area deviation through PI to obtain a voltage deviation.
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CN113067356A (en) * 2021-03-15 2021-07-02 华中科技大学 Reactive coordination control method and system for restraining LCC-HVDC overcurrent and transient voltage
CN114024452A (en) * 2021-11-16 2022-02-08 全球能源互联网研究院有限公司 Commutation control method and device of converter, converter and readable storage medium
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