CN103217623B - The line double-end fault distance-finding method had nothing to do with transition resistance and load current - Google Patents
The line double-end fault distance-finding method had nothing to do with transition resistance and load current Download PDFInfo
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Abstract
The invention belongs to electric power system fault field of locating technology, disclose a kind of line double-end Fault Locating Method had nothing to do with transition resistance and load current.Comprise: fault location device measures the positive and negative sequence voltage at transmission line of electricity two ends and positive and negative sequence electric current in real time, distributed current compensation is carried out to the positive and negative sequence electric current in transmission line of electricity two ends, then utilizes the positive and negative sequence voltage at transmission line of electricity two ends and the positive and negative sequence electric current after compensating directly to calculate abort situation.Application the inventive method is as two ends of electric transmission line fast failure location, and eliminate the impact of distributed capacitance on positioning result accuracy, without the need to asking its abort situation by searching algorithm, operand is few, and localization of fault speed is fast.The inventive method utilizes bi-endian component to realize two ends of electric transmission line localization of fault, is applicable to the localization of fault of the whole failure process of any fault type of transmission line of electricity, has general applicability.
Description
Technical Field
The invention relates to the technical field of fault location of power systems, in particular to a line double-end fault location method irrelevant to transition resistance and load current.
Background
The fault location method may be classified into a double-ended location method and a single-ended location method according to a data source used. The distance measurement precision of the single-ended distance measurement method has serious deviation due to the influence of transition resistance, the single-ended distance measurement of over 90 percent of high-resistance ground faults fails, the field practical effect is poor, and the method cannot adapt to increasingly complex power grid operation modes. The method for measuring the distance of the double-end fault of the power transmission line has the advantages that the usable fault amount information is more, the accuracy of the fault distance measurement result is higher than that of the single-end fault distance measurement result, and the method is widely applied to the field.
The invention patent with application number 200710117748.X adopts a distributed parameter modeling method to realize the double-end distance measurement method of the power transmission line by using the distributed parameters, and calculates the fault distance by using the condition that the positive sequence voltage or the negative sequence voltage on the two sides of the line are equal. Because the actual operation parameters of the power grid are lumped parameters, the line distribution parameter data can not be provided, complicated exponential operation needs to be involved, the microcomputer codes are difficult to realize, and the practicability is poor.
The invention patent with application number 200710178364.9 discloses a method for achieving double-end distance measurement of a power transmission line by utilizing interphase electric quantity, which adopts distributed parameter modeling and calculates the distance from an interphase fault point to a protection installation position according to the principle that interphase voltages on two sides of the fault point are equal. The method utilizes the interphase fault electric quantity to calculate the fault position, and the interphase fault electric quantity only exists under the condition of interphase fault, so the method is only suitable for interphase fault distance measurement, and the method needs to involve complicated exponential operation, is difficult to realize microcomputer codes and has poor practicability.
The invention patent 'phasor and zero sequence combined method for realizing double-end distance measurement of power transmission line' with application number 200710178357.9 adopts zero sequence electric quantity, because the zero sequence electric quantity exists only when the power transmission line has ground fault, the method can only be applied to double-end distance measurement of the ground fault of the power transmission line, and is not applicable to other fault types of the power transmission line, and the method needs complicated exponential operation, and microcomputer codes are difficult to realize, and the practicability is poor.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a line double-end fault location method irrelevant to transition resistance and load current.
In order to achieve the purpose, the invention adopts the following technical scheme:
the line double-end fault location method irrelevant to the transition resistance and the load current is characterized by comprising the following steps of:
(1) providing a line fault distance measuring device which measures positive sequence voltage and positive sequence current or negative sequence voltage and negative sequence current at two ends of an m end and an n end of a power transmission line in real time;
(2) the line fault distance measuring device calculates the fault distance x from the fault position to the end m by using the positive sequence voltage and the positive sequence current or the negative sequence voltage and the negative sequence current at the two ends of the power transmission line:
wherein, the voltage is positive sequence voltage or negative sequence voltage of the m end of the power transmission line;the voltage is positive sequence voltage or negative sequence voltage of n ends of the power transmission line;the current is positive sequence current or negative sequence current of the m end of the power transmission line;the current is positive sequence current or negative sequence current of n ends of the power transmission line; z is a radical of1Is the positive sequence impedance of the transmission line with unit length; lmnThe length of the transmission line is the total length of the transmission line; omega is the angular frequency of the power system; c. C1The capacitance to ground of the transmission line is unit length; the voltage and current parameters in the mathematical model of the fault distance x between the fault position and the m end can only adopt the positive sequence parameters at the same time, orThe negative sequence parameter is used simultaneously.
The method specifically comprises the following steps:
calculating the fault distance x between the fault position and the m end by using the positive sequence voltage and the positive sequence current at the two ends of the power transmission line through the following calculation formula:
wherein, the positive sequence voltage is m ends of the power transmission line;the positive sequence voltage is n-end of the power transmission line;the m end positive sequence current of the power transmission line;the positive sequence current is n ends of the power transmission line; z is a radical of1Is the positive sequence impedance of the transmission line with unit length; omega is the angular frequency of the power system; c. C1Is the capacitance to ground of the transmission line with unit length.
The method comprises the following steps of calculating the fault distance x between a fault position and an m end by using negative sequence voltage and negative sequence current at two ends of a power transmission line through the following calculation formula:
wherein, is the m-end negative sequence voltage of the transmission line;is the negative sequence voltage of the n end of the transmission line;is the m-end negative sequence current of the transmission line;is the negative sequence current of the n end of the power transmission line; z is a radical of1Is the positive sequence impedance of the transmission line with unit length; omega is the angular frequency of the power system; c. C1Is the capacitance to ground of the transmission line with unit length.
Compared with the prior art, the invention has the following positive results:
the method of the invention compensates the distributed capacitance current, thereby eliminating the influence of the distributed capacitance current on the accuracy of the fault distance measurement result. The method of the invention directly calculates the fault distance by using the double-end positive sequence/negative sequence components of the power transmission line, does not need to calculate the fault position by a search algorithm, has less calculation amount and high fault distance measuring speed, and is suitable for fault distance measurement of the whole fault process of any fault type of the power transmission line.
Drawings
Fig. 1 is a schematic diagram of a transmission line fault to which the method of the present invention is applied.
Detailed Description
The technical scheme of the invention is further detailed in the following according to the attached drawings of the specification.
Fig. 1 is a schematic diagram of a transmission line fault to which the method of the present invention is applied. Positive and negative sequence voltages of m-side substation of power transmission line in fig. 1Positive and negative sequence currentAnd positive and negative sequence voltages of n-side transformer substation of power transmission linePositive and negative sequence currentThe method is characterized in that the method is respectively obtained by measuring synchronous Phasor Measurement Units (PMUs) arranged at transformer substations on the m side and the n side of the power transmission line, measured data are transmitted to a power transmission line fault distance measuring device through optical fiber communication, and the power transmission line fault distance measuring device adopts the method to complete the fault distance measuring function on a fault line.
Compensating the distributed capacitance current to obtain a compensated double-end positive sequence current:
compensating the distributed capacitance current to obtain a compensated double-end negative sequence current:
wherein lmnThe length of the transmission line is the total length of the transmission line; omega is the angular frequency of the power system; c. C1Is the capacitance to ground of the transmission line with unit length.
After the transmission line breaks down, the double-end positive sequence electrical quantity satisfies the following relation:
obtaining a fault distance calculation formula from a fault position to an m end according to the formula (1)
After the transmission line breaks down, the double-end negative sequence electric quantity satisfies the following relation:
obtaining a fault distance calculation formula from the fault position to the m end by the formula (2)
The method of the invention compensates the distributed capacitance current, thereby eliminating the influence of the distributed capacitance current on the accuracy of the fault distance measurement result. The method of the invention directly calculates the fault distance by using the double-end positive sequence/negative sequence components of the power transmission line, does not need to calculate the fault position by a search algorithm, has less calculation amount and high fault distance measuring speed, and is suitable for fault distance measurement of the whole fault process of any fault type of the power transmission line.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (1)
1. The line double-end fault distance measurement method irrelevant to the transition resistance and the load current is characterized by comprising the following steps of:
(1) providing a line fault distance measuring device which measures positive sequence voltage and positive sequence current or negative sequence voltage and negative sequence current at two ends of an m end and an n end of a power transmission line in real time;
(2) the line fault distance measuring device utilizes the positive sequence voltage and the positive sequence current or the negative sequence voltage and the negative sequence current at the two ends of the transmission line to calculate the fault distance x between the fault position and the m endm：
Wherein, the voltage is positive sequence voltage or negative sequence voltage of the m end of the power transmission line;the voltage is positive sequence voltage or negative sequence voltage of n ends of the power transmission line;the current is positive sequence current or negative sequence current of the m end of the power transmission line;the current is positive sequence current or negative sequence current of n ends of the power transmission line; z is a radical of1Is the positive sequence impedance of the transmission line with unit length; lmnThe length of the transmission line is the total length of the transmission line; omega is the angular frequency of the power system; c. C1The capacitance to ground of the transmission line is unit length; the fault distance x between the fault position and the end mmThe voltage and current parameters in the calculation formula can only adopt positive sequence parameters at the same time or adopt negative sequence parameters at the same time.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103675608A (en) * | 2013-12-23 | 2014-03-26 | 华北电力大学 | Computing method for cross circuit ungrounded fault points of parallel circuits |
| CN104155582B (en) * | 2014-08-29 | 2016-10-19 | 上海交通大学 | Distribution line fault section location method based on Full wave shape information |
| CN105699858B (en) * | 2016-04-28 | 2018-08-24 | 国网上海市电力公司 | A kind of aerial-cable hybrid line fault distance-finding method considering connection resistance |
| CN108051700B (en) * | 2017-10-19 | 2019-11-08 | 北京交通大学 | The phase component fault distance-finding method of distribution line parameter identification based on μ PMU |
| CN110780152A (en) * | 2019-10-29 | 2020-02-11 | 南京国电南自电网自动化有限公司 | Self-adaptive line protection fault distance measurement method and system |
| CN113933644A (en) * | 2020-07-14 | 2022-01-14 | 上海华建电力设备股份有限公司 | Power transmission line asymmetric fault positioning method free of influence of line parameters |
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| CN101183133A (en) * | 2007-11-29 | 2008-05-21 | 北京四方继保自动化股份有限公司 | Phase amount and zero sequence amount combined realization powerline both-end distance measuring method |
| CN101672883A (en) * | 2009-08-20 | 2010-03-17 | 北京四方继保自动化股份有限公司 | Overhead and cable mixed power transmission line fault locating method and device |
| CN102081132A (en) * | 2010-12-04 | 2011-06-01 | 西南交通大学 | Two-end distance measuring method of transmission line fault under dynamic condition |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101183133A (en) * | 2007-11-29 | 2008-05-21 | 北京四方继保自动化股份有限公司 | Phase amount and zero sequence amount combined realization powerline both-end distance measuring method |
| CN101672883A (en) * | 2009-08-20 | 2010-03-17 | 北京四方继保自动化股份有限公司 | Overhead and cable mixed power transmission line fault locating method and device |
| CN102081132A (en) * | 2010-12-04 | 2011-06-01 | 西南交通大学 | Two-end distance measuring method of transmission line fault under dynamic condition |
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