CN106300295B - A kind of dual sensitivity Bei Ruilong differential protecting methods of half-wavelength transmission line of alternation current - Google Patents
A kind of dual sensitivity Bei Ruilong differential protecting methods of half-wavelength transmission line of alternation current Download PDFInfo
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- CN106300295B CN106300295B CN201610808541.6A CN201610808541A CN106300295B CN 106300295 B CN106300295 B CN 106300295B CN 201610808541 A CN201610808541 A CN 201610808541A CN 106300295 B CN106300295 B CN 106300295B
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- 230000035945 sensitivity Effects 0.000 title abstract description 8
- 230000009977 dual effect Effects 0.000 title abstract 3
- 230000004224 protection Effects 0.000 claims abstract description 98
- 230000005611 electricity Effects 0.000 abstract 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
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Abstract
The invention discloses a kind of dual sensitivity Bei Ruilong differential protecting methods of half-wavelength transmission line of alternation current, including A）Dual sensitivity Bei Ruilong differential protection criterions are set, realize the protection to half-wavelength transmission line of alternation current all fronts troubles inside the sample space；B）According to transmission line of electricity Bergeron model, the difference current at half-wavelength transmission line of alternation current both ends is calculated；C）Judge whether muting sensitivity Bei Ruilong differential protections criterion meets operation condition；D）Judge whether high sensitivity Bei Ruilong differential protections criterion meets operation condition；E）Realize the differential protection of half-wavelength transmission line of alternation current overall length.The present invention uses muting sensitivity Bei Ruilong differential protection criterions, ensures two end regions short troubles in quickly excision line areas；Using highly sensitive Bei Ruilong differential protections criterion, ensure action message when interlude region short trouble in half wavelength line area, when external short-circuit is reliably failure to actuate, and is capable of the overall length of reliably protecting half-wavelength transmission line of alternation current, has a good application prospect.
Description
Technical Field
The invention relates to the technical field of power system relay protection, in particular to a double-sensitivity Bergeron differential protection method for a half-wavelength alternating-current power transmission line.
Background
The half-wavelength alternating current transmission refers to ultra-long-distance three-phase alternating current transmission with the electric distance close to 1 power frequency half-wave, namely 3000km (50 Hz). With the construction of energy internet, half-wavelength alternating current transmission is widely applied as an efficient long-distance intercontinental transmission mode.
The line transmission distance of the half-wavelength alternating current transmission is long, the voltage level is high, and the obvious distribution parameter characteristic is presented. The current differential protection principle is established on the basis of kirchhoff's current law, has good selectivity, can sensitively and quickly remove faults in a protection area, and is widely applied to conventional line protection. However, the distributed capacitance of the half-wavelength alternating-current transmission line is large, and the variation along the line voltage is large, so that the traditional method of combining the current differential protection with the capacitance current compensation is not suitable any more.
In an article ' power grid technology ' 2011 9 th ' of ' a half-wavelength alternating-current transmission line current differential protection principle based on a Bergeron model ', line distribution parameter characteristics are considered, a uniform transmission line characteristic equation is adopted, and a half-wavelength line protection method based on the Bergeron line model is provided. However, this method has disadvantages in that: when the half-wavelength alternating-current transmission line has a short-circuit fault in the middle section area in the area, the differential current value calculated according to the Bergeron model is smaller, and if a larger differential protection constant value is adopted, the differential protection is easy to refuse to operate when the fault occurs in the middle section area in the area; if a smaller differential protection fixed value is adopted, when a fault occurs outside a zone, the differential protection is easy to malfunction, and how to overcome the problem is a problem which is urgently needed to be solved at present.
Disclosure of Invention
The invention aims to solve the problem that differential protection is easy to fail or malfunction according to a Bergeron model when the existing half-wavelength alternating-current transmission line has a short-circuit fault. The double-sensitivity Bergeron differential protection method for the half-wavelength alternating-current transmission line has high differential protection accuracy, can reliably protect the full length of the half-wavelength alternating-current transmission line, and has good application prospect.
In order to achieve the purpose, the invention adopts the technical scheme that:
a double-sensitivity Bergeron differential protection method for a half-wavelength alternating current transmission line is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
step (A), setting double-sensitivity Bergeron differential protection criterion to realize protection of faults in the whole line area of the half-wavelength alternating current transmission line;
step (B), calculating differential currents at two ends of the half-wavelength alternating current transmission line according to the electric transmission line Bergeron model;
step (C), judging whether the low-sensitivity Bergeron differential protection criterion meets the action condition or not according to the differential current at the two ends of the half-wavelength alternating-current transmission line;
step (D), judging whether the high-sensitivity Bergeron differential protection criterion meets the action condition or not according to the differential current at the two ends of the half-wavelength alternating-current transmission line;
and (E) if any one of the low-sensitivity Bergeron differential protection criterion or the high-sensitivity Bergeron differential protection criterion meets the action condition, judging that the half-wavelength alternating-current transmission line has an in-zone fault, and carrying out the action of the Bergeron differential protection, so as to realize the full-length differential protection of the half-wavelength alternating-current transmission line.
The double-sensitivity berylzuron differential protection method for the half-wavelength alternating-current transmission line is characterized by comprising the following steps of: step (A), dual-sensitivity Bergeron differential protection criteria comprise low-sensitivity Bergeron differential protection criteria and are used for identifying short-circuit faults of two end regions in a half-wavelength alternating-current transmission line region; the high-sensitivity Bergeron differential protection criterion is used for identifying short-circuit faults of a middle section area in a half-wavelength alternating-current transmission line area, wherein a low-sensitivity differential constant value set by the low-sensitivity Bergeron differential protection criterion is a higher current constant value, and the higher current constant value is slightly larger than the maximum Bergeron differential current appearing when the half-wavelength alternating-current transmission line is short-circuited outside the area; the high-sensitivity Bergeron differential protection criterion sets a high-sensitivity differential fixed value as a lower current fixed value, the lower current fixed value is equal to the minimum short-circuit current required to be cut off by the protection of the half-wavelength alternating-current transmission line, and an auxiliary criterion is added to prevent misoperation.
The double-sensitivity berylzuron differential protection method for the half-wavelength alternating-current transmission line is characterized by comprising the following steps of: the auxiliary criterion is that when the single-side current amplitude of the half-wavelength alternating current transmission line is smaller than the auxiliary criterion set value, the auxiliary criterion meets the action condition.
The double-sensitivity berylzuron differential protection method for the half-wavelength alternating-current transmission line is characterized by comprising the following steps of: step (B), according to the electric transmission line Bergeron model, the method for calculating the differential current at the two ends of the half-wavelength alternating current electric transmission line comprises the following steps,
(B1) calculating positive sequence differential current, negative sequence differential current and zero sequence differential current of the half-wavelength alternating current transmission line according to the Bailon model of the transmission line;
(B2) and converting the positive sequence differential current, the negative sequence differential current and the zero sequence differential current into an A phase difference current amplitude, a B phase difference current amplitude and a C phase difference current amplitude at two ends of the half-wavelength alternating current transmission line.
The double-sensitivity berylzuron differential protection method for the half-wavelength alternating-current transmission line is characterized by comprising the following steps of: and (C) judging whether the low-sensitivity Bergeron differential protection criterion meets the action condition or not according to the differential current at the two ends of the half-wavelength alternating-current transmission line, wherein if the differential current of any phase is greater than the low-sensitivity differential fixed value, the low-sensitivity Bergeron differential protection criterion meets the action condition, and then judging that the short-circuit fault occurs in the two end regions in the half-wavelength alternating-current transmission line region.
The double-sensitivity berylzuron differential protection method for the half-wavelength alternating-current transmission line is characterized by comprising the following steps of: and (D) judging whether the high-sensitivity Bergeron differential protection criterion meets the action condition or not according to the differential current at the two ends of the half-wavelength alternating-current transmission line, and if the differential current of any phase is greater than the high-sensitivity differential constant value and the corresponding auxiliary criterion meets the action condition, judging that the short-circuit fault occurs in the middle section area in the half-wavelength alternating-current transmission line area.
The invention has the beneficial effects that: the double-sensitivity Bergeron differential protection method for the half-wavelength alternating-current transmission line adopts low-sensitivity Bergeron differential protection criterion to ensure that short-circuit faults of two end areas in a line area are quickly cut off; the high-sensitivity Bergeron differential protection criterion is adopted, so that the reliable action during the short-circuit fault of the middle section area in the half-wavelength circuit area is ensured, the reliable non-action during the short-circuit outside the area is ensured, the full length of the half-wavelength alternating-current transmission line can be reliably protected, and the application prospect is good.
Drawings
Fig. 1 is a flow chart of the double-sensitivity berelong differential protection method for a half-wavelength alternating-current transmission line of the invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the dual-sensitivity berelong differential protection method for half-wavelength ac transmission line of the present invention comprises the following steps,
setting double-sensitivity Bergeron differential protection criteria to realize protection of faults in a full line area of the half-wavelength alternating-current transmission line, wherein the double-sensitivity Bergeron differential protection criteria comprise low-sensitivity Bergeron differential protection criteria and are used for identifying short-circuit faults of two end areas in the half-wavelength alternating-current transmission line area; the high-sensitivity Bergeron differential protection criterion is used for identifying short-circuit faults of a middle section area in a half-wavelength alternating-current transmission line area, wherein a low-sensitivity differential constant value set by the low-sensitivity Bergeron differential protection criterion is a higher current constant value, the higher current constant value is slightly larger than the maximum Bergeron differential current appearing when the half-wavelength alternating-current transmission line is short-circuited outside the area, and the higher current constant value is not more than 1.1 times of the maximum Bergeron differential current appearing when the half-wavelength alternating-current transmission line is short circuited outside the area; the high-sensitivity Bergeron differential protection criterion sets a high-sensitivity differential fixed value as a lower current fixed value, the lower current fixed value is equal to the minimum short-circuit current required to be cut off by the protection of the half-wavelength alternating-current transmission line, and an auxiliary criterion is added to prevent misoperation; the auxiliary criterion is that when the single-side current amplitude of the half-wavelength alternating current transmission line is smaller than the auxiliary criterion set value, the auxiliary criterion meets the action condition;
step (B), calculating differential current at two ends of the half-wavelength alternating current transmission line according to the electric transmission line Bergeron model, comprising the following steps,
(B1) calculating positive sequence differential current, negative sequence differential current and zero sequence differential current of the half-wavelength alternating current transmission line according to the Bailon model of the transmission line;
(B2) converting the positive sequence differential current, the negative sequence differential current and the zero sequence differential current into an A phase difference dynamic current amplitude, a B phase difference dynamic current amplitude and a C phase difference dynamic current amplitude at two ends of a half-wavelength alternating current transmission line;
step (C), judging whether the low-sensitivity Bergeron differential protection criterion meets the action condition or not according to the differential current at the two ends of the half-wavelength alternating-current transmission line, wherein the judging process is as follows, if the differential current of any phase is larger than the low-sensitivity differential fixed value, the low-sensitivity Bergeron differential protection criterion meets the action condition, the short-circuit fault in the two end regions in the half-wavelength alternating-current transmission line region is judged, and the specific expression is,
if it isThe low-sensitivity Bergeron differential protection criterion of the phase A meets the action condition;
if it isThe low-sensitivity Bergeron differential protection criterion of the phase B meets the action condition;
if it isThe low-sensitivity Bergeron differential protection criterion of the C phase meets the action condition;
wherein,a, B, C-phase differential current amplitudes, Icdset1 is a low sensitivity differential constant;
step (D), judging whether the high-sensitivity Bergeron differential protection criterion meets the action condition or not according to the differential current at the two ends of the half-wavelength alternating current transmission line, wherein the judging process is as follows, if the differential current of any phase is larger than the high-sensitivity differential constant value and the corresponding auxiliary criterion meets the action condition, judging that the short-circuit fault occurs in the middle section area in the half-wavelength alternating current transmission line area, and concretely showing that,
if it isAnd isThen phase AThe high-sensitivity Bergeron differential protection criterion meets the action condition;
if it isAnd isThe high-sensitivity Bergeron differential protection criterion of the phase B meets the action condition;
if it isAnd isThe high-sensitivity Bergeron differential protection criterion of the C phase meets the action condition;
where Icdset2 is a high sensitivity differential fixed value,the current amplitudes of the single sides of the A, B, C phases are respectively, and Iset is an auxiliary criterion setting value;
and (E) if any one of the low-sensitivity Bergeron differential protection criterion or the high-sensitivity Bergeron differential protection criterion meets the action condition, judging that the half-wavelength alternating-current transmission line has an in-zone fault, and carrying out the action of the Bergeron differential protection, so as to realize the full-length differential protection of the half-wavelength alternating-current transmission line.
In summary, the double-sensitivity berylforegoing differential protection method for the half-wavelength ac transmission line of the present invention adopts the low-sensitivity berylforegoing differential protection criterion to ensure the rapid removal of the short-circuit fault in the two end regions in the line region; the high-sensitivity Bergeron differential protection criterion is adopted, so that the reliable action during the short-circuit fault of the middle section area in the half-wavelength circuit area is ensured, the reliable non-action during the short-circuit outside the area is ensured, the full length of the half-wavelength alternating-current transmission line can be reliably protected, and the application prospect is good.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A double-sensitivity Bergeron differential protection method for a half-wavelength alternating current transmission line is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
step (A), setting double-sensitivity Bergeron differential protection criterion to realize protection of faults in the whole line area of the half-wavelength alternating current transmission line;
step (B), calculating differential currents at two ends of the half-wavelength alternating current transmission line according to the electric transmission line Bergeron model;
step (C), judging whether the low-sensitivity Bergeron differential protection criterion meets the action condition or not according to the differential current at the two ends of the half-wavelength alternating-current transmission line;
step (D), judging whether the high-sensitivity Bergeron differential protection criterion meets the action condition or not according to the differential current at the two ends of the half-wavelength alternating-current transmission line;
and (E) if any one of the low-sensitivity Bergeron differential protection criterion or the high-sensitivity Bergeron differential protection criterion meets the action condition, judging that the half-wavelength alternating-current transmission line has an in-zone fault, and performing the double-sensitivity Bergeron differential protection action to realize the full-length differential protection of the half-wavelength alternating-current transmission line.
2. The double-sensitivity berylzuron differential protection method for the half-wavelength alternating-current transmission line according to claim 1, characterized in that: step (A), dual-sensitivity Bergeron differential protection criteria comprise low-sensitivity Bergeron differential protection criteria and are used for identifying short-circuit faults of two end regions in a half-wavelength alternating-current transmission line region; the high-sensitivity Bergeron differential protection criterion is used for identifying short-circuit faults of a middle section area in a half-wavelength alternating-current transmission line area, wherein a low-sensitivity differential constant value set by the low-sensitivity Bergeron differential protection criterion is a higher current constant value, and the higher current constant value is slightly larger than the maximum Bergeron differential current appearing when the half-wavelength alternating-current transmission line is short-circuited outside the area; the high-sensitivity differential constant value set by the high-sensitivity Bergeron differential protection criterion is a lower current constant value which is equal to the minimum short-circuit current required to be cut off by the protection of the half-wavelength alternating-current transmission line, and an auxiliary criterion is added to prevent misoperation.
3. The double-sensitivity berylzuron differential protection method for the half-wavelength alternating-current transmission line according to claim 2, characterized in that: the auxiliary criterion is that when the single-side current amplitude of the half-wavelength alternating current transmission line is smaller than the auxiliary criterion set value, the auxiliary criterion meets the action condition.
4. The double-sensitivity berylzuron differential protection method for the half-wavelength alternating-current transmission line according to claim 1, characterized in that: step (B), according to the electric transmission line Bergeron model, the method for calculating the differential current at the two ends of the half-wavelength alternating current electric transmission line comprises the following steps,
(B1) calculating positive sequence differential current, negative sequence differential current and zero sequence differential current of the half-wavelength alternating current transmission line according to the Bailon model of the transmission line;
(B2) and converting the positive sequence differential current, the negative sequence differential current and the zero sequence differential current into an A phase difference current amplitude, a B phase difference current amplitude and a C phase difference current amplitude at two ends of the half-wavelength alternating current transmission line.
5. The double-sensitivity berzuron differential protection method for the half-wavelength alternating-current transmission line according to claim 1 or 2, characterized in that: and (C) judging whether the low-sensitivity Bergeron differential protection criterion meets the action condition or not according to the differential current at the two ends of the half-wavelength alternating-current transmission line, wherein if the differential current of any phase is greater than the low-sensitivity differential fixed value, the low-sensitivity Bergeron differential protection criterion meets the action condition, and then judging that the short-circuit fault occurs in the two end regions in the half-wavelength alternating-current transmission line region.
6. The double-sensitivity berzuron differential protection method for the half-wavelength alternating-current transmission line according to claim 1 or 2, characterized in that: and (D) judging whether the high-sensitivity Bergeron differential protection criterion meets the action condition or not according to the differential current at the two ends of the half-wavelength alternating-current transmission line, and if the differential current of any phase is greater than the high-sensitivity differential constant value and the corresponding auxiliary criterion meets the action condition, judging that the short-circuit fault occurs in the middle section area in the half-wavelength alternating-current transmission line area.
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| CN107147125B (en) * | 2017-05-25 | 2023-09-22 | 中国电力科学研究院 | Method and device for determining steady-state voltage sensitivity of half-wavelength transmission line |
| CN109145337B (en) * | 2017-06-28 | 2020-12-18 | 中国电力科学研究院有限公司 | A modeling method and system for a half-wavelength AC transmission dynamic simulation system |
| CN109638796B (en) * | 2019-01-22 | 2020-05-05 | 天津大学 | Differential protection method for long-distance high-voltage direct-current transmission line |
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| CN1472857A (en) * | 2003-06-11 | 2004-02-04 | 贺家李 | Power transmission line longitudinal linkage protective method |
| CN1913275A (en) * | 2006-07-28 | 2007-02-14 | 天津大学 | Energy position tandem protection method and device for extra-high voltage transmission line |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1472857A (en) * | 2003-06-11 | 2004-02-04 | 贺家李 | Power transmission line longitudinal linkage protective method |
| CN1913275A (en) * | 2006-07-28 | 2007-02-14 | 天津大学 | Energy position tandem protection method and device for extra-high voltage transmission line |
Non-Patent Citations (2)
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