CN104052034A - Method for preventing high-voltage and direct-current transmission 50 Hz harmonic protection maloperation - Google Patents

Method for preventing high-voltage and direct-current transmission 50 Hz harmonic protection maloperation Download PDF

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Publication number
CN104052034A
CN104052034A CN201410321350.8A CN201410321350A CN104052034A CN 104052034 A CN104052034 A CN 104052034A CN 201410321350 A CN201410321350 A CN 201410321350A CN 104052034 A CN104052034 A CN 104052034A
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China
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harmonic
sec
voltage
component
amplitude
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CN201410321350.8A
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Chinese (zh)
Inventor
赵森林
杨建明
李林
刘建坤
汪成根
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南京南瑞继保电气有限公司
江苏省电力公司电力科学研究院
国家电网公司
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Priority to CN201410321350.8A priority Critical patent/CN104052034A/en
Publication of CN104052034A publication Critical patent/CN104052034A/en

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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Abstract

The invention relates to a method for preventing direct-current high-voltage transmission 50 Hz harmonic protection maloperation. The method includes the steps that the amplitude of a positive-sequence component of a second harmonic of current exchange and network exchange side three-phase alternating voltage and the amplitude of the secondary harmonic are detected respectively, and the amplitude of the positive-sequence component of the second harmonic and the amplitude of the second harmonic are compared with respective constant values respectively; when the amplitude of the positive-sequence component of the second harmonic is larger than the corresponding constant value and the amplitude of the second harmonic is larger than the corresponding constant value, a blocking signal is generated through time delay of the time T, and 50 Hz harmonic protection is blocked.

Description

Prevent the method for high voltage direct current transmission 50Hz harmonic protection malfunction
Technical field
The method that prevents the malfunction of high voltage direct current transmission 50Hz harmonic protection the present invention relates to, is applied in high voltage direct current transmission and extra-high voltage direct-current transmission field and control protective unit thereof.
Background technology
High pressure/extra-high voltage direct-current transmission engineering is by converter valve equipment, three-phase alternating current to be become to direct current in the sending end of electric energy to transmit at a distance, by converter valve equipment, direct current is become to the power transmission engineering of three-phase alternating current at the receiving terminal of electric energy again.In the situation of normal operation, between sending end and the converter valve equipment of receiving end, electric current only comprises DC component and does not comprise alternating current component.But in the time that the AC system of sending end or receiving end breaks down, in direct current, can comprise very large humorous 50Hz and 100Hz component, present DC transmission system has configured 50Hz and 100Hz harmonic protection accordingly.
Fault in ac transmission system just of the reason that makes to produce in direct current 50Hz, practical operating experiences and analogue test prove in the time of the normal inverter charging of AC system, and the change of current becomes net side three-phase alternating voltage can comprise a large amount of second harmonic positive sequence component and second harmonic.The existence of second harmonic positive sequence component and second harmonic can make DC side 50Hz component increase, thereby causes the action of 50Hz harmonic protection; This action belongs to malfunction, because equipment and whole system do not have fault.
Current 50Hz harmonic protection does not have corresponding faulty action preventing strategy.
Summary of the invention
The object of the invention is have malfunction and propose a kind of method that prevents the malfunction of HVDC (High Voltage Direct Current) transmission system 50Hz harmonic protection, the problem of 50Hz harmonic protection malfunction while having solved inverter charging when the inverter charging for the 50Hz harmonic protection existing in prior art.
Calculate change of current change net side three-phase alternating voltage secondary harmonic amplitude and second harmonic positive sequence component amplitude and comprise following step:
Gather the change of current and become net side three-phase alternating voltage, A cross streams voltage is UACL1, and B cross streams voltage is UACL2, and C cross streams voltage is UACL3; Wherein phase sequence is that UACL1 phase angular advance UACL2 phase angle 120 is spent, and UACL2 phase angular advance UACL3 phase angle 120 is spent, and UACL3 phase angular advance UACL1 phase angle 120 is spent;
Extract the change of current and become the second harmonic component in net side three-phase alternating voltage; Can adopt exchange rheology net side three-phase alternating voltage to carry out respectively discrete Fourier transform and obtain second harmonic component, also can adopt the additive methods such as filter to obtain second harmonic component.Wherein the second harmonic component in UACL1 is expressed as UACL1_SEC, and the second harmonic component in UACL2 is expressed as UACL2_SEC, and the second harmonic component in UACL3 is expressed as UACL3_SEC;
By second harmonic component UACL1_SEC, UACL2_SEC, the maximum in UACL3_SEC is defined as secondary harmonic amplitude;
Using formula (UAC l1_SEC+ UAC l2_SEC* a+UAC l3_SEC* a 2the second harmonic positive sequence component amplitude of three-phase alternating voltage, wherein constant a=cos (120o)+sin (120o) j are calculated in)/3;
The method logic that prevents the malfunction of high voltage direct current transmission 50Hz harmonic protection is as follows: in the time that secondary harmonic amplitude is greater than second harmonic definite value and second harmonic positive sequence component amplitude and is greater than second harmonic positive sequence component definite value, and the time delay of elapsed time T produces block signal locking high voltage direct current 50Hz harmonic protection.
Can prevent the malfunction of 50Hz harmonic protection during at inverter charging by increase the beneficial effect of method described in the invention at 50Hz harmonic protection.
Brief description of the drawings
Fig. 1 second harmonic component and second harmonic positive sequence component computational logic
Fig. 2 prevents 50Hz harmonic protection malfunction logic
Embodiment
Calculate change of current change net side three-phase alternating voltage secondary harmonic amplitude and second harmonic positive sequence component amplitude and comprise following step:
Gather the change of current and become net side three-phase alternating voltage, A cross streams voltage is UACL1, and B cross streams voltage is UACL2, and C cross streams voltage is UACL3; Wherein phase sequence is that UACL1 phase angular advance UACL2 phase angle 120 is spent, and UACL2 phase angular advance UACL3 phase angle 120 is spent, and UACL3 phase angular advance UACL1 phase angle 120 is spent;
Extract the change of current and become the second harmonic component in net side three-phase alternating voltage; Can adopt exchange rheology net side three-phase alternating voltage to carry out respectively discrete Fourier transform and obtain second harmonic component, also can adopt the additive methods such as filter to obtain second harmonic component.Wherein the second harmonic component in UACL1 is expressed as UACL1_SEC, and the second harmonic component in UACL2 is expressed as UACL2_SEC, and the second harmonic component in UACL3 is expressed as UACL3_SEC;
By second harmonic component UACL1_SEC, UACL2_SEC, the maximum in UACL3_SEC is defined as secondary harmonic amplitude;
Using formula (UAC l1_SEC+ UAC l2_SEC* a+UAC l3_SEC* a 2the second harmonic positive sequence component amplitude of three-phase alternating voltage, wherein constant a=cos (120o)+sin (120o) j are calculated in)/3;
The method logic that prevents the malfunction of high voltage direct current transmission 50Hz harmonic protection is as follows: when secondary harmonic amplitude is greater than second harmonic definite value and second harmonic positive sequence component amplitude is greater than second harmonic positive sequence component definite value, and the time delay of elapsed time T produces block signal locking high voltage direct current 50Hz harmonic protection.
The bright method that prevents the malfunction of high voltage direct current transmission 50Hz harmonic protection for instance below:
One of design high voltage direct current transmission protected host, comprises 50Hz harmonic protection, and increases the as described below method logic that prevents high voltage direct current transmission 50Hz harmonic protection in protected host.
Utilize as shown in Figure 1 the change of current of discrete fourier change calculations to become net side three-phase alternating voltage second harmonic component, wherein the second harmonic component in UACL1 is expressed as UACL1_SEC, second harmonic component in UACL2 is expressed as UACL2_SEC, and the second harmonic component in UACL3 is expressed as UACL3_SEC;
By second harmonic component UACL1_SEC, UACL2_SEC, the maximum in UACL3_SEC is defined as secondary harmonic amplitude;
Using formula (UAC l1_SEC+ UAC l2_SEC* a+UAC l3_SEC* a 2the second harmonic positive sequence component amplitude of three-phase alternating voltage, wherein constant a=cos (120o)+sin (120o) j are calculated in)/3;
Adopt the method logic that prevents the malfunction of high voltage direct current transmission 50Hz harmonic protection as shown in Figure 2: when secondary harmonic amplitude is greater than second harmonic definite value and second harmonic positive sequence component amplitude is greater than second harmonic positive sequence component definite value, and the time delay of elapsed time T produces block signal locking high voltage direct current 50Hz harmonic protection.
Above embodiment only, for explanation technological thought of the present invention, can not limit protection scope of the present invention with this, every technological thought proposing according to the present invention, and any change of doing on technical scheme basis, within all falling into protection range of the present invention.

Claims (4)

1. prevent the method for high voltage direct current transmission 50Hz harmonic protection malfunction; it is characterized in that: in the time that AC system voltage secondary harmonic amplitude is greater than second harmonic definite value and second harmonic positive sequence component amplitude and is greater than second harmonic positive sequence component definite value, and the time delay of elapsed time T produces block signal locking high voltage direct current 50Hz harmonic protection.
2. the method that prevents the malfunction of high voltage direct current transmission 50Hz harmonic protection as claimed in claim 1; it is characterized in that: extract the second harmonic component in three-phase alternating voltage; adopt exchange rheology three-phase alternating voltage to carry out respectively discrete Fourier transform and obtain second harmonic component, or adopt its method of filter to obtain second harmonic component.
3. the method that prevents the malfunction of high voltage direct current transmission 50Hz harmonic protection as claimed in claim 1, is characterized in that: by second harmonic component UACL1_SEC, and UACL2_SEC, the maximum in UACL3_SEC is defined as secondary harmonic amplitude; Wherein UACL1_SEC is the second harmonic component in A cross streams voltage U ACL1, and UACL2_SEC is the second harmonic component in B cross streams voltage U ACL2, and UACL3_SEC is the second harmonic component in C cross streams voltage U ACL3.
4. the method that prevents the malfunction of high voltage direct current transmission 50Hz harmonic protection as claimed in claim 1, is characterized in that: using formula (UAC l1_SEC+ UAC l2_SEC* a+UAC l3_SEC* a 2the second harmonic positive sequence component amplitude of three-phase alternating voltage, wherein constant a=cos (120o)+sin (120o) j are calculated in)/3.
CN201410321350.8A 2014-07-04 2014-07-04 Method for preventing high-voltage and direct-current transmission 50 Hz harmonic protection maloperation CN104052034A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105226607A (en) * 2015-10-22 2016-01-06 许继电气股份有限公司 A kind of extra-high voltage direct-current layer-specific access system 100Hz harmonic protection method
CN105552835A (en) * 2016-03-07 2016-05-04 国家电网公司 Anti-maloperation method for 50Hz harmonic protection for direct current line
CN109462247A (en) * 2018-10-31 2019-03-12 南方电网科学研究院有限责任公司 A kind of flexible direct current high-frequency harmonic resonance protection method
CN110676820A (en) * 2019-09-19 2020-01-10 北京四方继保自动化股份有限公司 High-frequency resonance backup protection method for flexible direct-current power transmission system
CN111049104A (en) * 2019-12-04 2020-04-21 华南理工大学 Converter transformer sympathetic inrush current identification method based on positive sequence second harmonic

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CN1897390A (en) * 2006-06-28 2007-01-17 南京南瑞继保电气有限公司 Actuation of 50 Hz protection definite value by current instruction
CN102623968A (en) * 2012-03-14 2012-08-01 上海交通大学 Characteristic-harmonic-based protection method and system for high-voltage direct current transmission line

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Publication number Priority date Publication date Assignee Title
CN1897390A (en) * 2006-06-28 2007-01-17 南京南瑞继保电气有限公司 Actuation of 50 Hz protection definite value by current instruction
CN102623968A (en) * 2012-03-14 2012-08-01 上海交通大学 Characteristic-harmonic-based protection method and system for high-voltage direct current transmission line

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105226607A (en) * 2015-10-22 2016-01-06 许继电气股份有限公司 A kind of extra-high voltage direct-current layer-specific access system 100Hz harmonic protection method
CN105226607B (en) * 2015-10-22 2017-09-12 许继电气股份有限公司 A kind of extra-high voltage direct-current layer-specific access system 100Hz harmonic protection methods
CN105552835A (en) * 2016-03-07 2016-05-04 国家电网公司 Anti-maloperation method for 50Hz harmonic protection for direct current line
CN105552835B (en) * 2016-03-07 2018-02-06 国家电网公司 A kind of method of DC line 50Hz harmonic protection faulty action preventings
CN109462247A (en) * 2018-10-31 2019-03-12 南方电网科学研究院有限责任公司 A kind of flexible direct current high-frequency harmonic resonance protection method
CN110676820A (en) * 2019-09-19 2020-01-10 北京四方继保自动化股份有限公司 High-frequency resonance backup protection method for flexible direct-current power transmission system
CN111049104A (en) * 2019-12-04 2020-04-21 华南理工大学 Converter transformer sympathetic inrush current identification method based on positive sequence second harmonic

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