CN110161369A - A kind of bipolar short trouble localization method of DC grid based on overhead transmission line RL model - Google Patents
A kind of bipolar short trouble localization method of DC grid based on overhead transmission line RL model Download PDFInfo
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- CN110161369A CN110161369A CN201910286935.3A CN201910286935A CN110161369A CN 110161369 A CN110161369 A CN 110161369A CN 201910286935 A CN201910286935 A CN 201910286935A CN 110161369 A CN110161369 A CN 110161369A
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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
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Abstract
The present invention relates to a kind of bipolar short trouble localization methods of the DC grid based on overhead transmission line RL model, belong to transmission & distribution electro-technical field.Accurate model is depended on without analytic solutions expression formula and fault analytical method positioning accuracy for electrical quantity after current failure, the present invention proposes to replace analytic solutions with measured value, the method for carrying out fault location with the equivalent overhead transmission line of RL model.According to the KVL and VAR of fault equivalence network, it can arrange and write loop-voltage equation.Line parameter circuit value is solved by preset failure test, calculates abort situation by obtaining electrical quantity.
Description
Technical field
The invention belongs to transmission & distribution electro-technical field more particularly to a kind of DC grid based on overhead transmission line RL model are double
Extremely short road Fault Locating Method.
Background technique
Flexible DC transmission technology has active reactive individually controllable because commutation failure problem is not present, trend reversion
When the constant equal many advantages of polarity of voltage, be widely used in new-energy grid-connected and consumption.
Requirement of the overhead transmission line because being able to satisfy direct current system large capacity, long distance power transmission is applied to straight more and more
Flow power grid construction.However due to being laid with distance, pass through with a varied topography, the climate variability of region, overhead transmission line failure it is multiple and
Fault point is difficult to search, thus accurately and reliably fault location technology to improve line walking efficiency, accelerate fault recovery speed, subtract
Few loss of outage guarantees that system safety operation is of great significance.
Existing Fault Locating Method from time, frequency, three, space angle can be divided into traveling wave method, intrinsic frequency method and
Fault analytical method.Fault Location With Traveling Wave precision is high, is widely used and positions in DC line fault, but that there are sample frequencys is high, no
Tolerance transition resistance, wave head easily distort, capture the problems such as difficulty.Intrinsic frequency method is without detecting wave head, stabilization with higher
Property, but anti-interference ability is poor and there are blind area.Fault analytical method stability equally with higher, but its precision
Dependent on model of power transmission system precision.
Transmission line of electricity simplified model is particularly significant for the theory analysis of HVDC transmission system.Bergeron model
It is included in line resistance as lumped parameter segmentation, it is inaccurate that this will lead to model.And it is included in resistance as distribution parameter
Though circuit model can improve model accuracy to a certain degree, it can also introduce higher differentiation and cause data ill.Multiterminal element
Power grid occur bipolar short trouble when because between each end converter station exist coupling and network structure it is sufficiently complex, the change of current can not be acquired
Station port voltage, electric current analytic solutions, thus can only be calculated by each electrical quantity measured value.How transient state after failure is used
Data obtain the equivalent RL model of transmission line of electricity and calculate abort situation whereby becoming one and have much asking for practical meaning in engineering
Topic.
Summary of the invention
For the bipolar short trouble of DC grid mentioned in above-mentioned background technique, and pay close attention to the reality of each transient state electrical quantity
Influence of the measured value to summarize back side system, it is herein using the equivalent RL model of transmission line of electricity after failure as point of penetration, modularization is more
Level converter (Modular Multilevel Converter, MMC) is equivalent to time-varying voltage source and is analyzed fault location
Algorithm.Algorithm depends on Kirchhoff's second law and Ohm's law.
The feature of technical solution of the present invention the following steps are included:
Step 1: DC power transmission line being equivalent to RL model, both-end converter station is equivalent to time-varying voltage source.Default route
The bipolar short trouble of metallicity occurs for midpoint, writes equation to one end failure mesh column according to Kirchhoff's second law.
Step 2: voltage equation in step 1 can be write as matrix form by choosing a certain Fixed Time Interval, wherein electric current
Differential is replaced with smoothing reactor pressure drop and reactance ratio.It is counter in turn to solve transmission line of electricity resistance per unit length, inductance ginseng
Number.
Step 3: referring to the equivalent transmission line of electricity of step 1, the bipolar short trouble through transition resistance is set in route somewhere.
According to KCL and VAR, column write both-end failure mesh voltage equation, still replace electric current using smoothing reactor pressure drop and reactance ratio
Differential.Two formulas subtract each other the influence that can eliminate transition resistance.Defining λ is that abort situation is complete with route at a distance from the converter station of one end
Long ratio is gone out the expression formula of λ by the derivation of equation of step 2.
Step 4: the fluctuation center of λ, as abort situation are calculated with least square method.
The present invention can solve the equivalent RL parameter of overhead transmission line by aforementioned four step, calculate route any position
The position of bipolar short trouble occurs.
Detailed description of the invention
Fig. 1 is that the equivalent circuit diagram after bipolar short trouble occurs for DC power transmission line somewhere.U in figure1(t) and u2(t)
Respectively indicate DC line both ends bipolar voltage measured value；i1(t) and i2(t) both ends DC current measured value is respectively indicated；um1
(t) and um2(t) voltage drop on the smoothing reactor of two sides is respectively indicated；LmIndicate smoothing reactor；ZfIndicate transition resistance；x1
And x2Respectively indicate distance of the fault point away from route both ends；r0And l0Route unit resistance, inductance are respectively indicated, it can be from FDTL
Model export, by the unfolding calculation in trifle below.
Fig. 2 is the corresponding calculated route unit resistance r of different time intervals0, inductance value l0。
Fig. 3 is the MMC-MTDC system based on FDTL model.
Fig. 4 corresponds to the calculated result of λ.
Specific embodiment
A kind of bipolar short trouble of DC grid based on overhead transmission line RL model of the present invention will be positioned below
Method elaborates.It is emphasized that following the description is only exemplary, the model being not intended to be limiting of the invention
It encloses and its applies.
The technical problem to be solved by the present invention is to by RL circuit after Equivalent DC transmission line malfunction, according to KVL and
VAR column write loop-voltage equation.Route unit resistance, inductance parameters are calculated by preparatory Test to Failure, it is electrical with actual measurement
Meter calculates abort situation.The present invention adopts the following technical scheme that realization:
The present invention is realized by following three step:
Step 1: overhead transmission line being equivalent to RL model, converter station is equivalent to time-varying voltage source, can obtain event as shown in Figure 1
Hinder equivalent network.When line parameter circuit value is sought in preset failure test, Z in Fig. 1f=0, x1=x2=L/2 can be arranged and be write out one end event
Hinder the voltage equation of mesh.
Step 2: substituting current differential, the r0 and l of route with smoothing reactor pressure drop and reactance ratio0Parameter can lead to
Crossing (1), Δ t is written to calculate at various time intervals, and includes r0And l0Matrix form provided in (2).
By putting the setting bipolar short trouble of metallicity, calculated r in the line0And l0As shown in Fig. 2.It can see
Out, r0And l0It is also in time domain, and waveform fluctuates near certain value, with the increase of different time intervals, this fluctuation
It becomes readily apparent from.Voltage and current value involved in paying attention to has passed through first order inertial loop first.In order to obtain in fluctuation
The heart uses least square method here.
It can calculate, the unit resistance, inductance parameters in the equivalent RL model of overhead transmission line are respectively 3.3597 × 10-5Ω/
M and 1.2751 × 10-6H/m。
Step 3: referring still to Fig. 1 transmission line malfunction equivalent network, being arranged in route somewhere bipolar short through transition resistance
Road failure.According to KCL and VAR, column write both-end failure mesh voltage equation.
Two formulas subtract each other the influence that can eliminate transition resistance.Pressure drop on smoothing reactor is represented byTherefore it can obtainIf enabling x1+x2=L, abort situation and route one end
Distance account for the ratio of total track lengthIt is represented by
Step 4: three short troubles are set on the route 1 of the MMC-MTDC system shown in Fig. 3 based on FDTL model
Position, failure occurs in time t=1s, and the fault distance from converter station S1 is respectively 10%, 50%, accounts for head office head
90%.The relevant voltage and the magnitude of current of each fault point are being independently used for calculating λ after first order inertial loop, as a result such as
Shown in Fig. 4.
Although first order inertial loop can filter out interference caused by high fdrequency component, it cannot completely eliminate voltage and electricity
The fluctuation of stream.The calculated λ of Fig. 4 is fluctuated in 2ms to 5ms near reference value after the failure occurred.It is asked to solve this
Topic, failure definition orientation factor η, to obtain the average value of fluctuation.
It should be noted that step 1,2,3 and 4 it is whole be used as summary of the invention, step 1,2 be step 3,4 basis, four
Step is organic indivisible entirety.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited to
This, anyone skilled in the art in the technical scope disclosed by the present invention, the variation that can readily occur in or replaces
It changes, should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection of claim
Subject to range.
Claims (2)
1. the bipolar short trouble localization method of a kind of DC grid based on overhead transmission line RL model, it is characterized in that passing through event in advance
Overhead transmission line RL model parameter, i.e. route resistance per unit length (r are calculated to obtain in barrier test0), inductance (l0).By the way that DC line is former
Barrier circuit is equivalent to RL circuit model, and actual measurement electrical quantity column in combined circuit both ends write fault loop Kirchoff s voltage equation, into
And derive orientation factor.The following steps are included: step 1: DC power transmission line being equivalent to RL model, both-end converter station is equivalent
For time-varying voltage source.The bipolar short trouble of metallicity occurs for default route midpoint, according to Kirchhoff's second law to one end event
Barrier mesh column write equation.Step 2: voltage equation in step 1 can be write as matrix form by choosing a certain Fixed Time Interval,
In, current differential is replaced with smoothing reactor pressure drop and reactance ratio.And then it is counter solve transmission line of electricity resistance per unit length,
Inductance parameters.Step 3: referring to the equivalent transmission line of electricity of step 1, the bipolar short trouble through transition resistance is set in route somewhere.
According to KCL and VAR, column write both-end failure mesh voltage equation, still replace electric current using smoothing reactor pressure drop and reactance ratio
Differential.Two formulas subtract each other the influence that can eliminate transition resistance.Defining λ is abort situation at a distance from the converter station of one end and total track length
Ratio, the expression formula of λ is gone out by the derivation of equation of step 2.Step 4: the fluctuation center of λ is calculated with least square method, i.e.,
For abort situation.
2. based on a kind of bipolar short trouble positioning side of DC grid based on overhead transmission line RL model described in claim 1
Method, it is characterized in that step 1,2,3 and 4 is whole as summary of the invention, and step 1,2 be step 3, and 4 basis, step 3,4 test simultaneously
Step 1,2 correctness are demonstrate,proved, four steps are organic indivisible entirety.
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| CN111679155A (en) * | 2020-06-17 | 2020-09-18 | 北京信息科技大学 | Digital analog simulation device and method for distribution line |
| CN112684290A (en) * | 2020-12-16 | 2021-04-20 | 华北电力大学 | Efficient calculation method for interelectrode short-circuit fault current of flexible direct-current power grid |
| CN113176474A (en) * | 2021-05-08 | 2021-07-27 | 东南大学 | Double-end direct-current power distribution network fault positioning method based on current self-adaptive control |
| CN113379104A (en) * | 2021-05-21 | 2021-09-10 | 青海大学 | Micro energy network real-time regulation and control method and system, electronic equipment and readable storage medium |
| CN116679236A (en) * | 2023-06-01 | 2023-09-01 | 中铁一局集团电务工程有限公司 | LSM-based subway contact network short-circuit impedance and short-circuit simulation test method and system |
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| CN113176474A (en) * | 2021-05-08 | 2021-07-27 | 东南大学 | Double-end direct-current power distribution network fault positioning method based on current self-adaptive control |
| CN113176474B (en) * | 2021-05-08 | 2022-08-02 | 东南大学 | Double-end direct-current power distribution network fault positioning method based on current self-adaptive control |
| CN113379104A (en) * | 2021-05-21 | 2021-09-10 | 青海大学 | Micro energy network real-time regulation and control method and system, electronic equipment and readable storage medium |
| CN116679236A (en) * | 2023-06-01 | 2023-09-01 | 中铁一局集团电务工程有限公司 | LSM-based subway contact network short-circuit impedance and short-circuit simulation test method and system |
| CN116679236B (en) * | 2023-06-01 | 2024-05-17 | 中铁一局集团电务工程有限公司 | LSM-based subway contact network short-circuit impedance and short-circuit simulation test method and system |
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