CN110261719A - A kind of single-phase arc light high resistance earthing fault distance measuring method of wind power plant collection electric line - Google Patents
A kind of single-phase arc light high resistance earthing fault distance measuring method of wind power plant collection electric line Download PDFInfo
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- CN110261719A CN110261719A CN201910638598.XA CN201910638598A CN110261719A CN 110261719 A CN110261719 A CN 110261719A CN 201910638598 A CN201910638598 A CN 201910638598A CN 110261719 A CN110261719 A CN 110261719A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
A kind of single-phase arc light high resistance earthing fault distance measuring method of wind power plant collection electric line, faulted phase voltage, phase current and the zero-sequence current after measuring wind power plant current collection line outlet protection installation place failure 20ms are as input quantity；Each blower branch trouble electric current is solved based on principle of equipartition, fault branch electric current is fitted using zero-sequence current at wind power plant current collection line outlet, fault branch pressure drop is solved in conjunction with logarithm Arc Modelling, topological structure based on collection electric line writes out at current collection line outlet to the time domain voltage loop equation between grounding point, assuming that fault section initial value, nonlinear fitting solution is carried out to range equation using damped least square method, fault distance is calculated paragraph by paragraph, when the fault distance value of calculating is located exactly at the fault section of hypothesis, search terminates, fault distance value at this time is distance measurement result；The present invention may be directly applied in the fault wave recording device of substation's standard configuration, and without installing new measurement equipment, at low cost, algorithm the convergence speed is fast.
Description
Technical field
The invention belongs to Power System Faults Detection and protection field, in particular to a kind of single-phase arcs of wind power plant collection electric line
Light high resistance earthing fault distance measuring method.
Background technique
With the rapid development of wind-power electricity generation, electric system apoplexy electro-osmosis rate is continuously improved, and wind power plant failure is to system
The influence that safe and stable operation generates is also increasing.The most geographical location of wind farm siting is severe, by factors such as natural environments
It influences, current collection line single phase grounding failure probability is high, the arc lights high resistance earthing fault such as the breakdown of Chang Fasheng end, screen of trees, manually
Hunting fault location difficulty is big, seriously constrains the safe and economic operation of wind-power electricity generation.Therefore the single-phase arc of wind power plant collection electric line
The ranging of light high resistance earthing fault is of great significance.
Wind power plant current collection line construction is complicated, has multiple blower branch plant-grid connections, carries out collection line fault distance measuring
When, voltage, the current information of wind power plant boosting low pressure side at current collection line outlet, each blower branch can only be obtained under normal circumstances
The set end voltage and electric current on road can not then obtain, and lead to flow through the electric current of current collection line-internal not, therefore ranging information is seriously not
Foot, ranging are more difficult.For this problem, inventor has declared patent in 2017, and " a kind of wind power plant collection electric line is single-phase
Earth fault distance measurement method " (number of patent application: 201710341377.7), proposes a kind of frequency domain based on fault section search
Resistance algorithm algorithm, take full advantage of wind chassis type high voltage side of transformer causes zero-sequence current that can not pass through using delta connection
The characteristics of, blower branch current is carried out using the current collection line outlet magnitude of current to simplify equivalent solution, and go out based on collection electric line
Zero-sequence current derives fault branch pressure drop at mouthful, tentatively solves the problems, such as the single-phase ground fault distance measuring of wind power plant collection electric line.
But fault branch is reduced to pure resistance branch in the invention, is no longer applicable in when arc light high resistance earthing fault occurs for route.
Ranging for arc light high resistance earthing fault, inventor was in the patent that is authorized " transmission line of electricity arc light high resistance earthing fault in 2019
Method of single end distance measurement " (patent No.: 201610012500.6), but its parameter is only applicable to ultra-high-tension power transmission line and can not be applied to
Low-voltage distributing line, and transmission line of electricity topological structure is also different from collection electric line, and for this problem, the present invention will be surveyed having
Away from logarithm Arc Modelling is introduced in method, the parameter in model is accordingly repaired in conjunction with the actual conditions of wind power plant collection electric line
Just, the precision ranging of the single-phase arc light high resistance earthing fault of wind power plant collection electric line is realized.
Summary of the invention
In order to overcome above-mentioned problem of the prior art, the invention proposes a kind of single-phase arc light high resistants of wind power plant collection electric line
Earth fault distance measurement method solves each blower branch trouble electric current based on principle of equipartition, at wind power plant current collection line outlet
Zero-sequence current is fitted fault branch electric current, solves fault branch pressure drop in conjunction with logarithm Arc Modelling, the topology based on collection electric line
Structure is write out at current collection line outlet to the time domain voltage loop equation between grounding point, it is assumed that fault section initial value, using resistance
Buddhist nun's least square method carries out nonlinear fitting solution to range equation, fault distance is calculated paragraph by paragraph, when the fault distance value of calculating
When being located exactly at the fault section of hypothesis, search terminates, and fault distance value at this time is distance measurement result.
A kind of single-phase arc light high resistance earthing fault distance measuring method of wind power plant collection electric line, comprising the following steps:
1) phase voltage, phase current and the zero sequence electricity after measurement wind power plant current collection line outlet protection installation place failure 20ms
Flow data, as input quantity, it may be assumed that
Faulted phase voltageFaulted phase currentZero-sequence current i0；
WhereinIt is separate for failure: A phase, B phase or C phase；
2) it is based on principle of equipartition, calculates the branch current i of every Fans after failureDFIG:
Wherein n is the blower number of branches that are connected in the collection electric line；
3) the collection electric line for being connected with n Fans is divided into n sections, Mei Yiduan using blower branch grid node as separation
Length be respectively L1、L2......Ln, to L since m=11Section scans for, and the fitting initial value of setting fault distance l is collection
The half of electric line longest distance, and corresponding arc parameters initial value U is setT0、Is0, found out with damped least square method fitting
Optimal solution obtains m sections of distance measurement result；M value successively increases, and the section of corresponding search is also increase accordingly, until the survey found out
Until when being exactly in searched for section away from result l, the l value obtained for the last time is then distance measurement result.
Damped least square method fitting finds out optimal solution using following formula:
M=(1,2,3,4...n-1, n),
Z1、Z2、Z0For positive and negative, the zero sequence impedance for collecting electric line unit length；
Respectively collect the positive sequence of electric line, the resistance of zero sequence, inductance value；
KRFor resistance zero sequence current compensation factor,
KLFor inductance zero sequence current compensation factor,
UT、IsFor arc parameters, UT0、Is0For the initial value of the parameter；
RfFor tower-footing resistance.
The features of the present invention and technical effect:
Arc Modelling is introduced into wind power plant collection electric line arc light high resistance earthing fault ranging by the present invention, utilizes collection electric line
Exit zero-sequence current combination logarithm Arc Modelling indicates fault branch pressure drop, lists range equation in time domain, chooses more samplings
Point data acquires optimal solution using damped least square method fitting, and search obtains fault distance paragraph by paragraph, and algorithm the convergence speed is fast, surveys
It is higher away from precision.
Detailed description of the invention
Fig. 1 is the wind power plant structural schematic diagram using the method for the present invention.
Fig. 2 is blower branch wiring schematic diagram.
Fig. 3 is zero sequence equivalent network after wind power plant current collection line single phase grounding failure.
Specific embodiment
The single-phase arc light high resistance earthing fault distance measuring method of a kind of wind power plant collection electric line proposed by the present invention, embodiment are detailed
It is described as follows:
Using the double-fed fan motor field model of the method for the present invention as shown in Figure 1, wherein current collection line length is 8km, route ginseng
Numerical value is as shown in table 1.The double-fed blower of 4 1.5MW is connected in collection electric line altogether, is collected in electric line between every two Fans
Spacing be 2km, therefore wind power plant collection electric line is divided into 4 sections, each section length 2km.Using the method for the present invention
Fault location device passes through voltage transformer (PT) respectively, current transformer (CT) measures busbar voltage sum aggregate electric line exit
Current value.Assuming that singlephase earth fault occurs for CD sections of midpoint A phases in Fig. 1, physical fault distance is 5km, using cybernetics electric arc
Model carries out the emulation of arc light high resistance earthing fault, and arc length is set as 50cm, and tower-footing resistance is set as 10 Ω.
1 wind power plant collection electric line major parameter of table
1) 100 group data (a cycle be 80 group data) of the measurement route after protecting installation place failure 20ms are as defeated
Enter amount, i.e. phase voltage ua, phase current ia, zero-sequence current i0；
2) the branch current i of every Fans after failure is calculated based on principle of equipartitionDFIG:
3) gradually sectioning search obtains distance measurement result:
Assuming that fault point is located at the 1st section, the measurement that step 1) is obtained brings following formula into, if fault distance initial value
For l0=4km, UT0=0.5kV, Is0=0.0001kA finds out optimal solution with damped least square method:
L=4.9236km is calculated, fault distance is not inconsistent with fault section, therefore, it is determined that in this section, not continue
Search.
It is further assumed that fault point is located at the 2nd section, the measurement that step 1) is obtained brings following formula into and continues to be fitted
It solves:
L=5.0014km is calculated, fault distance is not inconsistent with fault section, therefore, it is determined that in this section, not continue
Search.
Assume again that fault point is located at the 3rd section, the measurement that step 1) is obtained brings following formula into and is fitted solution:
L=5.0198km is calculated to obtain, fault distance is consistent with fault section, and search finishes, and show that distance measurement result is
5.0198km。
The distance measurement result and error of different faults point in 2 wind power plant collection electric line of table
Claims (2)
1. a kind of single-phase arc light high resistance earthing fault distance measuring method of wind power plant collection electric line, which comprises the following steps:
1) phase voltage, phase current and the zero-sequence current number after measurement wind power plant current collection line outlet protection installation place failure 20ms
According to as input quantity, it may be assumed that
Faulted phase voltageFaulted phase currentZero-sequence current i0；
WhereinIt is separate for failure: A phase, B phase or C phase；
2) it is based on principle of equipartition, calculates the branch current i of every Fans after failureDFIG:
Wherein n is the blower number of branches that are connected in the collection electric line；
3) by the collection electric line for being connected with n Fans using blower branch grid node as separation, it is divided into n sections, each section of length
Degree is respectively L1、L2……Ln, to L since m=11Section scans for, and the fitting initial value of setting fault distance l is collection electric line
The half of longest distance, and corresponding arc parameters initial value U is setT0、Is0, optimal solution is found out with damped least square method fitting,
Obtain m sections of distance measurement result；M value successively increases, and the section of corresponding search is also increase accordingly, until the distance measurement result l found out
Just in the section searched for until, the l value being calculated at this time is then distance measurement result.
2. the single-phase arc light high resistance earthing fault distance measuring method of a kind of wind power plant collection electric line according to claim 1, special
Sign is that damped least square method fitting finds out optimal solution using following formula:
Z1、Z2、Z0For positive and negative, the zero sequence impedance for collecting electric line unit length；
Respectively collect the positive sequence of electric line, the resistance of zero sequence, inductance value；
KRFor resistance zero sequence current compensation factor,
KLFor inductance zero sequence current compensation factor,
UT、IsFor arc parameters, UT0、Is0For the initial value of the parameter；
RfFor tower-footing resistance.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111208449A (en) * | 2020-01-17 | 2020-05-29 | 南京工程学院 | Single-phase earth fault distance measurement method and system for series-parallel line |
| CN113447758A (en) * | 2021-06-17 | 2021-09-28 | 天津大学 | Single-phase earth fault distance measuring method for multi-branch current collection circuit of wind power plant |
| CN113777440A (en) * | 2021-08-05 | 2021-12-10 | 杭州华辰电力控制工程有限公司 | Method for positioning single-phase earth fault of current collection circuit of photovoltaic power station |
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| CN1657959A (en) * | 2005-03-11 | 2005-08-24 | 天津大学 | Rang-measuring method for transmission line one-phase earth fault of small current neutral grounding system |
| CN103630798A (en) * | 2013-09-12 | 2014-03-12 | 清华大学 | Transmission line single-phase grounding fault single-end ranging method |
| CN105514923A (en) * | 2015-11-26 | 2016-04-20 | 清华大学 | Arc modeling method for high-resistance ground fault of power transmission line |
| CN105606959A (en) * | 2016-01-08 | 2016-05-25 | 清华大学 | Single-end ranging method for arc light high-resistance earth fault of power transmission line |
| CN107167703A (en) * | 2017-05-16 | 2017-09-15 | 清华大学 | A kind of wind power plant current collection line single phase grounding failure distance-finding method |
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- 2019-07-16 CN CN201910638598.XA patent/CN110261719A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1657959A (en) * | 2005-03-11 | 2005-08-24 | 天津大学 | Rang-measuring method for transmission line one-phase earth fault of small current neutral grounding system |
| CN103630798A (en) * | 2013-09-12 | 2014-03-12 | 清华大学 | Transmission line single-phase grounding fault single-end ranging method |
| CN105514923A (en) * | 2015-11-26 | 2016-04-20 | 清华大学 | Arc modeling method for high-resistance ground fault of power transmission line |
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| CN107167703A (en) * | 2017-05-16 | 2017-09-15 | 清华大学 | A kind of wind power plant current collection line single phase grounding failure distance-finding method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111208449A (en) * | 2020-01-17 | 2020-05-29 | 南京工程学院 | Single-phase earth fault distance measurement method and system for series-parallel line |
| CN113447758A (en) * | 2021-06-17 | 2021-09-28 | 天津大学 | Single-phase earth fault distance measuring method for multi-branch current collection circuit of wind power plant |
| CN113447758B (en) * | 2021-06-17 | 2023-08-18 | 天津大学 | Single-phase ground fault distance measurement method for multi-branch current collecting line of wind power plant |
| CN113777440A (en) * | 2021-08-05 | 2021-12-10 | 杭州华辰电力控制工程有限公司 | Method for positioning single-phase earth fault of current collection circuit of photovoltaic power station |
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Application publication date: 20190920 |