CN105279342A - Segmenting method for subway contact system lead, system, simulating method and simulating system - Google Patents

Abstract

The invention discloses a segmenting method for a subway contact net lead in a CDEGS lightning model. The segmenting method is characterized in that a least value N of the number of contact net lead segments is calculated through a model, namely N=(m+1)*(2int[(25a-183)/366]+3), wherein m is the number of span, a is the average span, and int[] is an integral function. The segmenting method aims at a subway system at a viaduct segment. An HIFRIQ module of CDEGS software is used for modeling the power supply mode of the subway contact net at the viaduct segment. The invention provides a conductor segmenting method for calculating an insulator withstand voltage of the subway line at the viaduct segment based on a CDEGS simulation model, wherein a requirement for high calculation precision is satisfied and calculating efficiency is improved.

Description

The segmentation method of subway contact line conducting wire and system, emulation mode and system

Technical field

The invention belongs to the simulation technical field of subway contact line conducting wire, be specifically related to the segmentation method of a kind of subway contact line conducting wire in CDEGS lightning impulse model and system, for emulation mode and the system of subway contact line conducting wire lightning impulse.

Background technology

In recent years, along with the development of city underground traffic, subway becomes one of main traffic instrument of people's trip gradually.Subway is quick with it, and on time, the feature such as steady is subject to the favor of people, and nowadays city and intercity subway are being built in many cities.Now, train operation has been no longer the principal character of current subway in underground, and along with circuit develops to suburb, subway has transferred ground to by underground or run on overpass.Present subway is the engineering construction project of Mechatronic Systems and electronic system high concentration.Thunder and lightning directly threatens the personal safety of passenger and related personnel, causes dysfunction or the fault of the electric systems such as signal, communication system and traction power source.Because the construction of structures between overhead station, elevated region is in outstanding position, subway is subject to probability that thunder and lightning threatens can be higher, and degree is also more serious, and lightning fault happens occasionally.

But present stage, the design of subway lightning protection can not meet the fast-developing requirement of subway, and lack relevant standard, and between subway and high-speed railway, electric pressure and power supply system are all not identical, therefore subway lightning protection directly can not indiscriminately imitate the achievement in research of high ferro lightning protection.In the design in order to meet the lightning protection requirement of subway, frequent employing CDEGS carries out modeling and simulating, the important step that equitable subsection is simulation modeling is carried out to wire, if segmentation is reasonable not, as segmentation is less, then every section longer, produce larger deviation by causing the calculated value at insulator two ends and actual value; Segmentation is too short, segments can be caused too much, cause greatly increase the computing time of model.

This patent is for this present situation, and propose the segmentation method of a kind of subway contact line conducting wire in CDEGS lightning impulse model, the method can determine the number of contact line conducting wire segmentation fast, and meets computational accuracy and computing velocity requirement simultaneously.

Summary of the invention

In order to solve the technical matters of contradiction between simulation accuracy and simulation efficiency in CDEGS lightning impulse model, there is provided a kind of while reaching simulation accuracy, the segmentation method of subway contact line conducting wire in CDEGS lightning impulse model of balance simulation efficiency and system, a kind of emulation mode for subway contact line conducting wire lightning impulse and system.

In order to solve the problem, the present invention is achieved by following technical scheme:

The segmentation method of subway contact line conducting wire of the present invention in CDEGS lightning impulse model, by calculating the minimum value N of contact line conducting wire division number with drag:

N＝(m+1)*(2int[(25a-183)/366]+3)

Wherein m is span number, and a is average span, and int [] is bracket function.

Further, by calculating the maximal value M of contact line conducting wire division number with drag:

$M=(m+1)*(2\mathrm{int}\[\frac{a-10r}{20r}\]+1)$

Wherein m is span number, and a is average span, and r is the radius of contact line conducting wire, and int [] is bracket function.

For calculating the system of subway contact line conducting wire at the division number of CDEGS lightning impulse model, comprise minimum value computing module, described minimum value computing module is by calculating the minimum value N of contact line conducting wire division number with drag:

N＝(m+1)*(2int[(25a-183)/366]+3)

Wherein m is span number, and a is average span, and int [] is bracket function.

Further, also comprise maximum value calculation module, described maximum value calculation module is by calculating the maximal value M of contact line conducting wire division number with drag:

$M=(m+1)*(2\mathrm{int}\[\frac{a-10r}{20r}\]+1)$

Wherein m is span number, and a is average span, and r is the radius of contact line conducting wire, and int [] is bracket function.

For an emulation mode for subway contact line conducting wire lightning impulse, comprise step S1,

S1, by calculating the minimum value N of contact line conducting wire division number with drag:

N＝(m+1)*(2int[(25a-183)/366]+3)

Wherein m is span number, and a is average span, and int [] is bracket function;

S2, according to the contact line conducting wire division number obtained in S1, set up contact net power supply mode realistic model, carry out simulation analysis.

Further, before S2, also comprise S11, by calculating the maximal value M of contact line conducting wire division number with drag:

$M=(m+1)*(2\mathrm{int}\[\frac{a-10r}{20r}\]+1)$

Wherein m is span number, and a is average span, and r is the radius of contact line conducting wire, and int [] is bracket function.

Further, also comprise step S3, by the lightning impulse model of contact line conducting wire division number Input Software CDEGS that calculates, in lightning impulse model, set up contact net power supply mode realistic model, carry out simulation analysis.

For an analogue system for subway contact line conducting wire lightning impulse, comprise minimum value computing module and emulation module,

Described minimum value computing module is by calculating the minimum value N of contact line conducting wire division number with drag:

N＝(m+1)*(2int[(25a-183)/366]+3)

Wherein m is span number, and a is average span, and int [] is bracket function;

Described emulation module, according to the contact line conducting wire division number will obtained in minimum value computing module, is set up contact net power supply mode realistic model, is carried out simulation analysis.

Further, maximum value calculation module is also comprised:

Described maximum value calculation module is by calculating the maximal value M of contact line conducting wire division number with drag:

$M=(m+1)*(2\mathrm{int}\[\frac{a-10r}{20r}\]+1)$

Wherein m is span number, and a is average span, and r is the radius of contact line conducting wire, and int [] is bracket function.

Further, described emulation module is the lightning impulse model of CDEGS, and it is set up contact net power supply mode realistic model for receiving contact line conducting wire division number, realize simulation analysis.

Compared with prior art, the invention has the beneficial effects as follows:

The present invention is directed to viaduct section subway system, the HIFRIQ module of CDEGS software is utilized to carry out modeling to overpass subway contact net power supply mode, propose a kind of conductor segments method calculating overpass subway line insulator withstand voltage based on CDEGS realistic model, while meeting computational accuracy, improve the efficiency calculated.

Accompanying drawing explanation

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail, wherein:

Fig. 1 is the schematic diagram determining contact line conducting wire length in the segmentation method of subway contact line conducting wire of the present invention in CDEGS lightning impulse model;

Fig. 2 is the insulator withstand voltage schematic diagram of subway contact line conducting wire of the present invention in the segmentation method of CDEGS lightning impulse model;

Fig. 3 is the contact line conducting wire stepwise schematic views of the segmentation method of subway contact line conducting wire of the present invention in CDEGS lightning impulse model;

Fig. 4 originally returns the conductor segment length of the segmentation method of bright described subway contact line conducting wire in CDEGS lightning impulse model to the Accuracy schematic diagram of conductor voltage current simulations result.

Embodiment

Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.

The present invention is directed to viaduct section subway system, the HIFRIQ module of CDEGS software is utilized to carry out modeling to overpass subway contact net power supply mode, propose a kind of conductor segments method calculating overpass subway line insulator 2 withstand voltage based on CDEGS realistic model, while meeting computational accuracy, improve the efficiency calculated.

As Figure 1-Figure 4, the know-why that the present invention realizes above-mentioned purpose is: the span number m first determining contact net circuit, and the length a of wire between contact net adjacent struts 1 _m, by extending half span a/2 respectively by the starting point of contact line conducting wire and terminal, ensure the contact line conducting wire hitch point endpoint location of a certain section wherein.Concrete steps are:

The first step, collects the design parameter of subway contact line conducting wire, comprises the span number m of wire radius r, modeling section, and total wire 3 length L=a ₁+ a ₂+ ... + a _m, wherein a ₁, a ₂a _mbe respectively contact net the 1st, 2 ... conductor length between m adjacent struts.

Second step, according to the span data that the first step is collected, calculates the average span a=L/m of circuit.In CDEGS model during modeling, span between contact net adjacent struts is set to average span, need to ensure that wire hitch point is positioned at the point midway of a certain segmentation simultaneously, therefore the starting point of contact line conducting wire and terminal are extended half average span, then wire increases an average span, and now the length of actual wire is L _y=a* (m+1).

3rd step, China's standard lightning current waveform is 2.6/50us, and the duration of usually getting lightning current is T=300us, and when to lightning current time-domain signal discretize, in order to computational accuracy, getting time step is △ t=0.1us, and therefore sampling spot number is:

X＝T/s＝300/0.1＝3000

When carrying out discretize to lightning current time-domain signal in CDEGS software, program generates sampling spot number with the exponential form of 2.Therefore the sampling spot number processed can only be the power side of 2, and in order to put forward high-frequency resolution, number of sampling should be not less than 3000.

2 ¹¹<3000<2 ¹²

Actual sampling number is X=2 ¹²the employing time interval of time, i.e. actual step size=T/X=300/4096 in=4096, CDEGS.

According to time domain sampling theorem, as long as the nyquist frequency of discrete system is higher than the highest frequency of sampled signal or bandwidth, just aliasing can be avoided.Can obtain according to nyquist frequency formula:

$f=\frac{1}{2*\mathrm{\&Delta;}t}=4096/(2*300)=6.827*{10}^{6}Hz$

When carrying out staging treating to conductor segment, conductor segments can calculate and produces very large impact calculating especially high-frequency, and the length that ormal conductor segmentation should meet most long conductor section is no more than λ/6.

Electric current velocity of propagation is in the conductor the light velocity, and according to wave propagation formula v=λ f, under highest frequency, the wavelength of current wave is minimum, now:

$\mathrm{\&lambda;}=\frac{v}{f}=3*{10}^8/6.827*{10}^{6}m$

The maximum length of the conductor segments therefore in air can not more than λ/6=7.32m

By the L of contact line conducting wire _yeach span a be divided into 2n+1 section, now wire hitch point is positioned at the mid point of (n+1)th section.In order to meet the requirement of computational accuracy, according to the requirement of CDEGS software, institute's division number need meet expression formula:

$\begin{array}{c}a/(2n+1)<7.32\\ \&DoubleRightArrow;(2n+1)>a/7.32\\ \&DoubleRightArrow;n>(25a-183)/366\end{array}$

Because conductor segment is integer, therefore n >=int [(25a-183)/366]+1

Draw according to single conductor simulation calculation and formulae discovery contrast, analyze the conductor segment length after segmentation to the Accuracy of conductor voltage current simulations result as shown in Figure 4:

According to simulation result, when the most long conductor section after conductor segments is greater than 10 times of conductor radius r, phantom error close to zero, therefore in order to meet the definition for slender conductor in CDEGS, the relation demand fulfillment between section length and radius:

$\begin{array}{c}10r<a/(2n+1)\\ \&DoubleRightArrow;(2n+1)<a/10r\\ \&DoubleRightArrow;n<\frac{a-10r}{20r}\end{array}$

$n\&le;\mathrm{int}\&lsqb;\frac{a-10r}{20r}\&rsqb;$

Draw according to above derivation $\mathrm{int}\&lsqb;(25a-183)/366\&rsqb;+1\&le;n\&le;\mathrm{int}\&lsqb;\frac{a-10r}{20r}\&rsqb;$

Therefore the division number minimum value N obtaining contact line conducting wire total is:

N＝(m+1)*(2int[(25a-183)/366]+3)

Wherein m is span number, and a is average span, and int [] is bracket function.

The total division number maximal value M of contact line conducting wire is:

$M=(m+1)*(2\mathrm{int}\&lsqb;\frac{a-10r}{20r}\&rsqb;+1)$

Wherein m is span number, and a is average span, and r is the radius of contact line conducting wire, and int [] is bracket function.

When estimating fast, the segments of conductor segment gets N, and when accurate Calculation, segments measures M.

By the segments that above-mentioned steps obtains, while can ensureing that conductor length is full of sufficient CDEGS software emulation precision, the quantity of segmentation is minimum, thus maximally reduces calculated amount, improves computing velocity.

The segmentation method of subway contact line conducting wire in CDEGS lightning impulse model, by calculating the minimum value N of contact line conducting wire division number with drag:

N＝(m+1)*(2int[(25a-183)/366]+3)

Wherein m is span number, and a is average span, and int [] is bracket function.

By calculating the maximal value M of contact line conducting wire division number with drag:

$M=(m+1)*(2\mathrm{int}\&lsqb;\frac{a-10r}{20r}\&rsqb;+1)$

Wherein m is span number, and a is average span, and r is the radius of contact line conducting wire, and int [] is bracket function.

For calculating the system of subway contact line conducting wire at the division number of CDEGS lightning impulse model, comprise minimum value computing module, described minimum value computing module is by calculating the minimum value N of contact line conducting wire division number with drag:

N＝(m+1)*(2int[(25a-183)/366]+3)

Wherein m is span number, and a is average span, and int [] is bracket function.

Also comprise maximum value calculation module, described maximum value calculation module is by calculating the maximal value M of contact line conducting wire division number with drag:

$M=(m+1)*(2\mathrm{int}\&lsqb;\frac{a-10r}{20r}\&rsqb;+1)$

Wherein m is span number, and a is average span, and r is the radius of contact line conducting wire, and int [] is bracket function.

For an emulation mode for subway contact line conducting wire lightning impulse, comprise

S1, by calculating the minimum value N of contact line conducting wire division number with drag:

N＝(m+1)*(2int[(25a-183)/366]+3)

Wherein m is span number, and a is average span, and int [] is bracket function.

S2, by calculating the maximal value M of contact line conducting wire division number with drag:

$M=(m+1)*(2\mathrm{int}\&lsqb;\frac{a-10r}{20r}\&rsqb;+1)$

Wherein m is span number, and a is average span, and r is the radius of contact line conducting wire, and int [] is bracket function.

S3, by the lightning impulse model of contact line conducting wire division number Input Software CDEGS that calculates, in lightning impulse model, set up realistic model, carry out simulation analysis.

For an analogue system for subway contact line conducting wire lightning impulse, comprise minimum value computing module, maximum value calculation module, emulation module,

Described minimum value computing module is by calculating the minimum value N of contact line conducting wire division number with drag:

N＝(m+1)*(2int[(25a-183)/366]+3)

Wherein m is span number, and a is average span, and int [] is bracket function.

Described maximum value calculation module is by calculating the maximal value M of contact line conducting wire division number with drag:

$M=(m+1)*(2\mathrm{int}\&lsqb;\frac{a-10r}{20r}\&rsqb;+1)$

Wherein m is span number, and a is average span, and r is the radius of contact line conducting wire, and int [] is bracket function.

Described emulation module is the lightning impulse model of CDEGS, and it, for receiving contact line conducting wire division number, sets up realistic model, realizes simulation analysis.

The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, therefore everyly do not depart from technical solution of the present invention content, the any amendment done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.

Claims (10)

1. the segmentation method of subway contact line conducting wire in CDEGS lightning impulse model, is characterized in that: by calculating the minimum value N of contact line conducting wire division number with drag:

N＝(m+1)*(2int[(25a-183)/366]+3)

Wherein m is span number, and a is average span, and int [] is bracket function.

2. subway contact line conducting wire segmentation method in CDEGS lightning impulse model according to claim 1, is characterized in that: by calculating the maximal value M of contact line conducting wire division number with drag:

$M=(m+1)*(2\mathrm{int}\&lsqb;\frac{a-10r}{20r}\&rsqb;+1)$

Wherein m is span number, and a is average span, and r is the radius of contact line conducting wire, and int [] is bracket function.

3. one kind for calculating the system of subway contact line conducting wire at the division number of CDEGS lightning impulse model, it is characterized in that: comprise minimum value computing module, described minimum value computing module is by calculating the minimum value N of contact line conducting wire division number with drag:

N＝(m+1)*(2int[(25a-183)/366]+3)

Wherein m is span number, and a is average span, and int [] is bracket function.

4. according to claim 3 for calculating the division number of subway contact line conducting wire at CDEGS lightning impulse model, it is characterized in that: also comprise maximum value calculation module, described maximum value calculation module is by calculating the maximal value M of contact line conducting wire division number with drag:

$M=(m+1)*(2\mathrm{int}\&lsqb;\frac{a-10r}{20r}\&rsqb;+1)$

Wherein m is span number, and a is average span, and r is the radius of contact line conducting wire, and int [] is bracket function.

5. for an emulation mode for subway contact line conducting wire lightning impulse, it is characterized in that: comprise step S1,

S1, by calculating the minimum value N of contact line conducting wire division number with drag:

N＝(m+1)*(2int[(25a-183)/366]+3)

Wherein m is span number, and a is average span, and int [] is bracket function;

S2, according to the contact line conducting wire division number obtained in S1, set up contact net power supply mode realistic model, carry out simulation analysis.

6., according to claim 5 for the emulation mode of subway contact line conducting wire lightning impulse, it is characterized in that: before S2, also comprise

S11, by calculating the maximal value M of contact line conducting wire division number with drag:

$M=(m+1)*(2\mathrm{int}\&lsqb;\frac{a-10r}{20r}\&rsqb;+1)$

Wherein m is span number, and a is average span, and r is the radius of contact line conducting wire, and int [] is bracket function.

7. according to any one of claim 5 or 6 for the emulation mode of subway contact line conducting wire lightning impulse, it is characterized in that: also comprise step S3:

S3, by the lightning impulse model of contact line conducting wire division number Input Software CDEGS that calculates, in lightning impulse model, set up contact net power supply mode realistic model, carry out simulation analysis.

8. for an analogue system for subway contact line conducting wire lightning impulse, it is characterized in that: comprise minimum value computing module and emulation module,

Described minimum value computing module is by calculating the minimum value N of contact line conducting wire division number with drag:

N＝(m+1)*(2int[(25a-183)/366]+3)

Wherein m is span number, and a is average span, and int [] is bracket function;

Described emulation module, according to the contact line conducting wire division number will obtained in minimum value computing module, is set up contact net power supply mode realistic model, is carried out simulation analysis.

9. according to claim 8 for the analogue system of subway contact line conducting wire lightning impulse, it is characterized in that: also comprise maximum value calculation module:

Described maximum value calculation module is by calculating the maximal value M of contact line conducting wire division number with drag:

$M=(m+1)*(2\mathrm{int}\&lsqb;\frac{a-10r}{20r}\&rsqb;+1)$

Wherein m is span number, and a is average span, and r is the radius of contact line conducting wire, and int [] is bracket function.

10. described according to Claim 8 or 9 any one for the analogue system of subway contact line conducting wire lightning impulse, it is characterized in that: described emulation module is the lightning impulse model of CDEGS, it is for receiving contact line conducting wire division number, set up contact net power supply mode realistic model, realize simulation analysis.