CN108736478B - Method for testing influence of signal polluted by higher harmonic on control protection - Google Patents

Method for testing influence of signal polluted by higher harmonic on control protection Download PDF

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Publication number
CN108736478B
CN108736478B CN201810683905.1A CN201810683905A CN108736478B CN 108736478 B CN108736478 B CN 108736478B CN 201810683905 A CN201810683905 A CN 201810683905A CN 108736478 B CN108736478 B CN 108736478B
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signal
control
polluted
alternating current
harmonics
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CN108736478A (en
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刘志江
曾冠铭
郭海平
李书勇
郭琦
李鹏
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CSG Electric Power Research Institute
China Southern Power Grid Co Ltd
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CSG Electric Power Research Institute
China Southern Power Grid Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01Arrangements for reducing harmonics or ripples
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40Arrangements for reducing harmonics

Abstract

The invention discloses a method for testing the influence of a signal polluted by higher harmonics on control protection, which comprises the following steps: acquiring a measuring point position of a signal acquired by a control protection host; acquiring a transmission path of a polluted signal when a high-order harmonic source exists on an alternating current side; determining whether the contaminated signal has been software filtered; judging whether the filtering effect of the software filtering on the higher harmonics meets the requirement or not; and judging whether the signal polluted by the higher harmonic has influence on the control and protection functions. The method for testing the influence of the signal polluted by the higher harmonic on the control protection can effectively solve the problem that the influence of the signal polluted by the higher harmonic on the control and protection functions cannot be tested in the prior art.

Description

Method for testing influence of signal polluted by higher harmonic on control protection
Technical Field
The invention relates to the technical field of signal transmission, in particular to a method for testing the influence of signals polluted by higher harmonics on control protection.
Background
The effective component of the alternating current power grid is single frequency of power frequency (50Hz/60Hz), and any component inconsistent with the power frequency is called harmonic.
Due to the nonlinear characteristic of the high-voltage direct-current converter, harmonic waves appear in an alternating-current system and a direct-current system. With the development of the power grid, the number of power electronic devices connected in the power grid is gradually increased, and as the power electronic devices can be equivalent to harmonic sources for the power grid, harmonic pollution of signals transmitted by the power grid is more and more serious.
The influence and harm of the harmonic waves on the signal transmission control protection are very serious, and the main points are as follows:
(1) harmonic waves can cause a large amount of active power and reactive power loss, and influence the economic operation of a power grid;
(2) when harmonic components exist in the system, local parallel resonance or series resonance of equipment can be caused, so that loss and heat are increased, and even the equipment is damaged;
(3) the harmonic wave can influence the judgment of the control protection program, so that the AC/DC protection is refused to be operated or is operated mistakenly.
The inventor finds out that the prior art has no technical scheme for testing the influence of signals polluted by higher harmonics on control and protection functions.
Disclosure of Invention
The embodiment of the invention provides a method for testing the influence of signals polluted by higher harmonics on control protection, which can effectively solve the problem that the influence of signals polluted by higher harmonics on control and protection functions cannot be tested in the prior art.
The embodiment of the invention provides a method for testing the influence of a signal polluted by higher harmonics on control protection, which comprises the following steps:
acquiring a measuring point position of a signal acquired by a control protection host;
acquiring a transmission path of a polluted signal when a high-order harmonic source exists on an alternating current side;
judging whether the polluted signal is filtered by software, and executing the next step if the polluted signal is filtered by the software;
judging whether the filtering effect of the software filtering on the higher harmonics meets the requirement or not, and executing the next step if the filtering effect of the software filtering on the higher harmonics does not meet the requirement;
and judging whether the signal polluted by the higher harmonic has influence on the control and protection functions.
As the improvement of the scheme, the method for acquiring the measuring point position of the acquired signal adopts an alternating current side measuring point circuit for acquisition;
the alternating current side measuring point circuit comprises a harmonic power supply, a power frequency power supply, an alternating current bus, an alternating current high-voltage circuit breaker, a converter transformer, a current converter, a direct current filter and an alternating current filter;
the harmonic power supply is connected with the power frequency power supply in series, one side of the harmonic power supply is grounded, and one side of the power frequency power supply is connected with the alternating current bus;
the alternating-current high-voltage circuit breaker, the converter transformer and the converter are connected in series, and one end of the alternating-current high-voltage circuit breaker is connected to the alternating-current bus;
the direct current filter is connected in parallel with two ends of the converter;
one end of the alternating current filter is connected with the alternating current bus, and the other end of the alternating current filter is grounded.
As an improvement of the scheme, the acquisition source of the transmission path for acquiring the polluted signals is the control protection host.
As an improvement of the scheme, the specific method for judging whether the polluted signal is filtered by software is as follows:
if the condition that the signal does not pass through a software filter in the process from the input control host to the function input value is met, judging that the signal does not pass through the software filter;
and if the condition that the signal does not pass through the software filter from the input control host to the process of serving as the function input value is not met, judging that the signal passes through the software filter.
As an improvement of the above scheme, a specific method for determining whether the filtering effect of the software filtering on the higher harmonics meets the requirement is as follows:
drawing a baud graph of the filter according to the signal parameters input into the software filter;
if the conditions that the display frequency of the Baud chart is equal to 900Hz and the gain is less than-3 dB are met, judging that the filtering effect meets the requirement of filtering higher harmonics;
and if the conditions that the display frequency of the Baud chart is equal to 900Hz and the gain is less than-3 dB are not met, judging the filtering effect as that the higher harmonics can not be filtered.
As an improvement of the scheme, the specific method for judging the influence of the signal polluted by the higher harmonic waves on the control protection is as follows:
if the signal is subjected to software filtering and the filtering effect of the software filtering is that higher harmonics can be filtered, the signal polluted by the higher harmonics has no influence on the control and protection functions;
if the signal is filtered by software and the filtering effect of the software filtering is that the higher harmonics can not be filtered, adopting simulation analysis, injecting the higher harmonics with different times and different amplitudes at the AC side to obtain the output result of the related control protection function during the period with harmonic pollution, comparing the output result with the output result of the control protection function without harmonic pollution, and obtaining the influence result of the signal polluted by the higher harmonics on the control and protection functions through the result of the simulation analysis and the response of the control protection host;
if the signal is not filtered by software, simulation analysis is adopted, higher harmonics with different times and different amplitudes are injected into the alternating current side to obtain output results of related control protection functions during the period with harmonic pollution, the output results are compared with output results of the control protection functions without harmonic pollution, and the influence results of the signal polluted by the higher harmonics on the control and protection functions are obtained through the results of the simulation analysis and the response of the control protection host.
As an improvement of the above scheme, the simulation analysis method comprises: performing simulation by using an RTDS (real time Digital Simulator);
the method for obtaining the influence result of the signal polluted by the higher harmonic on the control and protection functions comprises the following steps:
if the responses of the control protection host machine before and after the signal is polluted by the higher harmonics are the same, judging that the influence result of the higher harmonics on the filtered signal and the control and protection functions of the filtered signal is no influence;
if the responses of the control protection host machine before and after the signal is polluted by the higher harmonics are different, the influence result of the higher harmonics on the filtered signal and the control and protection functions of the filtered signal is judged to be influenced.
As an improvement of the above scheme, the filtering effect of the ac sampling circuit may also be determined, and the specific method is as follows:
an alternating current sampling board card is adopted as the alternating current sampling circuit;
the numerical value of the cut-off frequency parameter of the alternating current sampling board card and 900Hz are used as the judgment conditions of the filtering effect;
if the cutoff frequency parameter of the alternating current sampling board card is larger than 900Hz, judging that the filtering effect of the alternating current sampling board card on the alternating current higher harmonic wave does not meet the requirement;
and if the AC sampling board card does not meet the condition that the cutoff frequency parameter of the AC sampling board card is greater than 900Hz, judging that the filtering effect of the AC sampling board card on the AC higher harmonic meets the requirement.
As an improvement of the above scheme, the specific use of the contaminated signal in each control protection host can also be judged, and the judging method is as follows: the reading control protects the built-in program of the host computer.
As an improvement of the above, the higher harmonic is an ac electrical quantity.
The method for testing the influence of the signal polluted by the higher harmonic on the control protection has the following beneficial effects:
when the signal polluted by the harmonic wave passes through the sampling circuit or the software filtering and the software filtering effect meets the requirement, the signal can be prevented from being influenced by the harmonic wave and can be continuously transmitted; when the signal polluted by the harmonic wave does not pass through the sampling circuit or the software filtering and the software filtering effect does not meet the requirement, the influence of the signal polluted by the harmonic wave on the control and protection functions can be accurately judged, the specific proportion of the harmonic wave in the signal polluted by the harmonic wave which can influence the control and protection functions is given, data support is provided for further processing of the signal polluted by the harmonic wave, the power loss and the equipment damage rate in the signal transmission process are reduced, and the alternating current and direct current protection is more stable.
Drawings
Fig. 1 is a schematic flowchart of a method for testing the influence of a signal contaminated by a higher harmonic on control protection according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an ac side test point circuit of a method for testing the influence of a signal contaminated by a higher harmonic on control protection according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic flowchart of a method for testing an influence of a signal contaminated by a higher harmonic on control protection according to an embodiment of the present invention is shown, including the following steps:
acquiring a measuring point position of a signal acquired by a control protection host;
acquiring a transmission path of a polluted signal when a high-order harmonic source exists on an alternating current side;
judging whether the polluted signal is filtered by software, and executing the next step if the polluted signal is filtered by the software;
judging whether the filtering effect of the software filtering on the higher harmonics meets the requirement or not, and executing the next step if the filtering effect of the software filtering on the higher harmonics does not meet the requirement;
and judging whether the signal polluted by the higher harmonic has influence on the control and protection functions.
The method comprises the following specific steps:
the structure of the alternating current side measuring point circuit of the method for testing the influence of the signal polluted by higher harmonics on control protection is shown in fig. 2, wherein the alternating current side measuring point circuit comprises a harmonic power supply, a power frequency power supply, an alternating current bus, an alternating current high voltage circuit breaker, a converter transformer, a current converter, a direct current filter and an alternating current filter;
the harmonic power supply is connected with the power frequency power supply in series, one side of the harmonic power supply is grounded, and one side of the power frequency power supply is connected with the alternating current bus; the alternating-current high-voltage circuit breaker, the converter transformer and the current converter are connected in series, and one end of the alternating-current high-voltage circuit breaker is connected to an alternating-current bus; the direct current filter is connected in parallel at two ends of the current converter; one end of the alternating current filter is connected with the alternating current bus, and the other end of the alternating current filter is grounded.
And acquiring a transmission path of the polluted signal by the control protection host.
Determining whether the contaminated signal has been software filtered by a determination method comprising:
if the condition that the polluted signal does not pass through the software filter from the input control host to the process of serving as the function input value is met, judging that the polluted signal does not pass through the software filter;
and if the condition that the polluted signal does not pass through the software filter from the input control host to the process as the functional input value is not met, judging that the polluted signal passes through the software filter.
Whether the filtering effect of the software filtering on the higher harmonics meets the requirement is judged by the following method:
drawing a baud graph of the filter according to the signal parameters input into the software filter;
if the conditions that the display frequency of the Baud chart is equal to 900Hz and the gain is less than-3 dB are met, judging the filtering effect as being capable of filtering higher harmonics;
and if the conditions that the display frequency of the Baud chart is equal to 900Hz and the gain is less than-3 dB are not met, judging the filtering effect as that the higher harmonics can not be filtered.
Whether signals polluted by higher harmonics have influence on control and protection functions is judged by the following method:
if the signal is filtered by software and the filtering effect of the software filtering is that higher harmonics can be filtered, the signal polluted by the higher harmonics has no influence on the control and protection functions;
if the signal is filtered by software and the filtering effect of the software filtering is that the higher harmonic wave can not be filtered, adopting simulation analysis, injecting the higher harmonic wave with different times and different amplitudes at the AC side to obtain the output result of the related control protection function during the period with harmonic pollution, comparing the output result with the output result of the control protection function without harmonic pollution, and obtaining the influence result of the signal polluted by the higher harmonic wave on the control and protection functions through the result of the simulation analysis and the response of the control protection host;
if the signal is not filtered by software, simulation analysis is adopted, higher harmonics with different times and different amplitudes are injected into the alternating current side to obtain output results of related control protection functions during the period with harmonic pollution, the output results are compared with output results of the control protection functions without harmonic pollution, and the influence results of the signal polluted by the higher harmonics on the control and protection functions are obtained through the results of the simulation analysis and the response of the control protection host.
The method for obtaining the influence result of the signal polluted by the higher harmonic on the control and protection functions comprises the following steps:
if the responses of the control protection host machine before and after the signal is polluted by the higher harmonic wave are the same, judging that the influence result of the signal polluted by the higher harmonic wave on the control and protection functions is no influence;
if the responses of the control protection host machine before and after the signal is polluted by the higher harmonic wave are different, the influence result of the signal polluted by the higher harmonic wave on the control and protection functions is judged to be influenced.
Further, the method can also judge the filtering effect of the alternating current sampling circuit, and the specific method is as follows:
an alternating current sampling board card is adopted as the alternating current sampling circuit;
the numerical value of the cut-off frequency parameter of the alternating current sampling board card and 900Hz are used as the judgment conditions of the filtering effect;
if the cutoff frequency parameter of the alternating current sampling board card is larger than 900Hz, judging that the filtering effect of the alternating current sampling board card on the alternating current higher harmonic wave does not meet the requirement;
and if the AC sampling board card does not meet the condition that the cutoff frequency parameter of the AC sampling board card is greater than 900Hz, judging that the filtering effect of the AC sampling board card on the AC higher harmonic meets the requirement.
Further, the method can also judge the specific application of the polluted signals in each control protection host, and the judging method is as follows: the reading control protects the built-in program of the host computer.
Further, the higher harmonic is an ac electrical quantity.
The method for testing the influence of the signal polluted by the higher harmonic on the control protection has the following beneficial effects:
when the signal polluted by the harmonic wave passes through the sampling circuit or the software filtering and the software filtering effect meets the requirement, the signal can be prevented from being influenced by the harmonic wave and can be continuously transmitted; when the signal polluted by the harmonic wave does not pass through the sampling circuit or the software filtering and the software filtering effect does not meet the requirement, the influence of the signal polluted by the harmonic wave on the control and protection functions can be accurately judged, the specific proportion of the harmonic wave in the signal polluted by the harmonic wave which can influence the control and protection functions is given, data support is provided for further processing of the signal polluted by the harmonic wave, the power loss and the equipment damage rate in the signal transmission process are reduced, and the alternating current and direct current protection is more stable.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (7)

1. A method of testing the effect of signals contaminated with higher harmonics on control protection, comprising the steps of:
acquiring a measuring point position of a signal acquired by a control protection host;
acquiring a transmission path of a polluted signal when a high-order harmonic source exists on an alternating current side;
judging whether the polluted signal is filtered by software, and executing the next step if the polluted signal is filtered by the software;
judging whether the filtering effect of the software filtering on the higher harmonics meets the requirement or not, and executing the next step if the filtering effect of the software filtering on the higher harmonics does not meet the requirement;
judging whether the signal polluted by the higher harmonic has influence on the control and protection functions;
the specific method for judging whether the signal polluted by the higher harmonic affects the control and protection functions is as follows:
if the signal is subjected to software filtering and the filtering effect of the software filtering is that higher harmonics can be filtered, the signal polluted by the higher harmonics has no influence on the control and protection functions;
if the signal is filtered by software and the filtering effect of the software filtering is that the higher harmonics can not be filtered, adopting simulation analysis, injecting the higher harmonics with different times and different amplitudes at the AC side to obtain the output result of the related control and protection function during the period with harmonic pollution, comparing the output result with the output result of the control and protection function without harmonic pollution, and obtaining the influence result of the signal polluted by the higher harmonics on the control and protection functions through the result of the simulation analysis and the response of the control and protection host;
if the signal is not filtered by software, simulation analysis is adopted, higher harmonics with different times and different amplitudes are injected into the alternating current side to obtain output results of related control and protection functions during the period with harmonic pollution, the output results are compared with output results of the control and protection functions without harmonic pollution, and the influence results of the signal polluted by the higher harmonics on the control and protection functions are obtained through the results of the simulation analysis and the response of the control and protection host.
2. The method for testing the influence of signals polluted by higher harmonics on control protection as claimed in claim 1, wherein the method for obtaining the measuring point positions of the acquired signals is to use an alternating current side measuring point circuit for obtaining;
the alternating current side measuring point circuit comprises a harmonic power supply, a power frequency power supply, an alternating current bus, an alternating current high-voltage circuit breaker, a converter transformer, a current converter, a direct current filter and an alternating current filter;
the harmonic power supply is connected with the power frequency power supply in series, one side of the harmonic power supply is grounded, and one side of the power frequency power supply is connected with the alternating current bus;
the alternating current high voltage circuit breaker, the converter transformer and the converter are connected in series, and one end of the alternating current high voltage circuit breaker is connected to the alternating current bus;
the direct current filter is connected in parallel with two ends of the converter;
one end of the alternating current filter is connected with the alternating current bus, and the other end of the alternating current filter is grounded.
3. The method of claim 1, wherein the method of determining whether the signal contaminated with higher harmonics is software filtered is as follows:
if the condition that the signal does not pass through a software filter in the process from the input control host to the function input value is met, judging that the signal does not pass through the software filter;
and if the condition that the signal does not pass through the software filter from the input control host to the process of serving as the function input value is not met, judging that the signal passes through the software filter.
4. The method for testing the influence of the signal polluted by the higher harmonics on the control protection as claimed in claim 1, wherein the specific method for judging whether the filtering effect of the software filtering on the higher harmonics meets the requirement is as follows:
drawing a baud graph of the filter according to the signal parameters input into the software filter;
if the conditions that the display frequency of the Baud chart is equal to 900Hz and the gain is less than-3 dB are met, judging the filtering effect as being capable of filtering higher harmonics;
and if the conditions that the display frequency of the Baud chart is equal to 900Hz and the gain is less than-3 dB are not met, judging the filtering effect as that the higher harmonics can not be filtered.
5. The method of claim 1, wherein the simulation analysis method comprises the following steps: performing simulation by using an RTDS (real time digital simulator);
the method for obtaining the influence result of the signal polluted by the higher harmonic on the control and protection functions comprises the following steps:
if the responses of the control protection host machine before and after the signal is polluted by the higher harmonic wave are the same, judging that the influence result of the signal polluted by the higher harmonic wave on the control and protection functions is no influence;
if the responses of the control protection host machine before and after the signal is polluted by the higher harmonic wave are different, the influence result of the signal polluted by the higher harmonic wave on the control and protection functions is judged to be influenced.
6. The method for testing the influence of the signal polluted by the higher harmonic wave on the control protection as claimed in claim 1, wherein the filtering effect of the alternating current sampling circuit can be further judged by the following specific method:
an alternating current sampling board card is adopted as the alternating current sampling circuit;
the numerical value of the cut-off frequency parameter of the alternating current sampling board card and 900Hz are used as the judgment conditions of the filtering effect;
if the cutoff frequency parameter of the alternating current sampling board card is larger than 900Hz, judging that the filtering effect of the alternating current sampling board card on the alternating current higher harmonic wave does not meet the requirement;
and if the AC sampling board card does not meet the condition that the cutoff frequency parameter of the AC sampling board card is greater than 900Hz, judging that the filtering effect of the AC sampling board card on the AC higher harmonic meets the requirement.
7. A method of testing the effect of signals contaminated with higher harmonics on control protection according to claim 1, characterized in that the higher harmonics are ac electrical quantities.
CN201810683905.1A 2018-06-28 2018-06-28 Method for testing influence of signal polluted by higher harmonic on control protection Active CN108736478B (en)

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CN109946569B (en) * 2019-04-15 2021-03-12 南方电网科学研究院有限责任公司 Method and device for detecting exit risk of direct current filter and direct current power transmission system

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Publication number Priority date Publication date Assignee Title
EP1010985A1 (en) * 1998-12-07 2000-06-21 François Mougeot Method of determining the level of harmonic distortions of an electrical network and device with it
CN1881729A (en) * 2005-06-15 2006-12-20 许继集团有限公司 Harmonic measuring method for AC filter protection
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
CN106249022A (en) * 2016-07-08 2016-12-21 国网上海市电力公司 The analysis system and method that DC control and protection system is affected by exchange transient voltage

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1010985A1 (en) * 1998-12-07 2000-06-21 François Mougeot Method of determining the level of harmonic distortions of an electrical network and device with it
CN1881729A (en) * 2005-06-15 2006-12-20 许继集团有限公司 Harmonic measuring method for AC filter protection
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
CN106249022A (en) * 2016-07-08 2016-12-21 国网上海市电力公司 The analysis system and method that DC control and protection system is affected by exchange transient voltage

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