CN103559553A - Distributing line planning and distribution transform site selection optimizing method based on load moment theory - Google Patents

Abstract

Disclosed is a distributing line planning and distribution transform site selection optimizing method based on the load moment theory. The method is used for providing detection and analysis for line transformation such as line diameter change or load cutting and providing optimum load point distributing calculation and line specification model selection for an added plan based on known actual or future loads of a line by means of load moment calculation of the line loads during powerline transformation or added plan implementation. To solve the technical problems, the distributing line detection and power supply point distributing method takes county-level electric power enterprises as planning targets, the health degree of the line is calculated through a power grid model, and shunt lines are divided. Compared with the prior art, the distributing line planning and distribution transform site selection optimizing method based on the load moment theory has the advantages that load shunting is carried out on lines with low health degree through load moment calculation by means of the current power grid model, and powerline design or old line transformation is achieved based on an optimal economical-efficiency design with as little change as possible.

Description

Distribution line planning and distribution transforming Optimization Method for Location-Selection based on load square theory

Technical field

The present invention relates to field of power, relate in particular to distribution line planning and distribution transforming Optimization Method for Location-Selection based on load square theory.

Background technology

At present, because electric power basis in County Power Plant administrative area is all also weaker with planning, a little less than power supply capacity, be still distinct issues, cause two reasons that have of this situation: the one,, administrative area is large, line load terminal is many, line loss is large often to make one, and low-voltage causes the not enough problem of the power supply capacity on whole piece circuit; The 2nd,, the line terminal power load peak valley time, obviously and concentrate, in the situation that circuit and power transformation finite capacity and layout are difficult to adjust in time, overload caused controller switching equipment fault, damage, power failure phenomenon is general.To this, we need to be optimized circuit.Current power network planning, often according to the big or small position of power load and with the relative distance of power supply, by artificial mode, screen the scheme that economic target is good.But such relating to often added too much subjective factor.

Further, application number is for disclosing a kind of comparatively planing method of advanced distribution line in electric line equipment management system based on RFID of mono-kind of the patent of invention < < of " CN201110381625.3 " and management method > > thereof, this invention belongs to field of power, a kind of electric line equipment management system and management method thereof based on RFID is provided, adopt cheaply Radio Frequency ID card as the distinguished symbol of transmission and distribution line pipeline equipment, its volume is little, lightweight, corrosion-resistant, life-span is long, mobile handheld terminal has GPS function, make to read the coding of Radio Frequency ID card, more accurate, convenient, can the various operating modes of on-the-spot input describe, relevant information data can be stored by memory module, use after this equipment takes pictures, the track data that these are had to id information is sent to data server and carries out permanent storage, line facility and various state owned property have been realized to management and record effectively, reduced handling cost, can effectively carry out management of state-owned property and planning, avoid the second investment of repetition and the generation that equipment loses maintenance condition.

But such equipment cost is large, maintenance cost is also very high, is difficult to promote.

In order conscientiously to improve the delivery quality in territory, vast county, the science while guaranteeing all kinds of transformation of distribution at county level, we need a kind of effective wiring method more economically.The optimization that electric power networks sets up is one of important process content of power planning, and its core is to seek the electric power networks of structure the best, and object is to receive loss minimum, the material of electrical network to economize, once invest most economical most.

Therefore the optimization that we need some standards that can quantize, measure and method to come auxiliary power network to set up, seeks the electric power networks of structure the best, and object is to receive loss minimum, the material of electrical network to economize, once invest most economical most.

Summary of the invention

The object of the invention is to when power circuit transformation or newly-increased planning, because reality or the distant view load of circuit are known, by the load square to line load, calculate, for track remodelling, as thread-changing footpath or load cutover provide, detect and analyze, for newly-increased planning provides optimum load point to layout, calculate and circuit specification type selecting.

In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:

Distribution line planning and distribution transforming Optimization Method for Location-Selection based on load square theory, take County Power Plant as rule

Draw object, comprise the following steps:

A. search or select to carry out rack or the cable line of wireline inspection, calculate the total load square M of this circuit _t;

B. by the theory load square M with identical electric pressure, same size circuit _maxcompare, draw the health status of current circuit;

If total load square M C. _tbe greater than theoretical load square, but identical electric pressure, if other specification circuit theoretical negative lotus square can meet current line load, is changed the electric wire of different wire diameters;

If D. step C does not meet, need the circuit shunting of load, by spatial analysis, obtain with current circuit apart from the n bar circuit being in a good state of health that is less than l as alternative can diverting route;

E. by circuit total load square M _twith theory load square M _maxcalculate the load square Δ M of current circuit overload load, by Δ M, obtain load to be shunted on current circuit, after calculated load shunting, the total load square of diverting route, and load moment ratio with the theory of diverting route, confirm that whether the diverting route after load shunting is healthy;

F. to the N bar circuit after shunting, the health status after by increase-volume is monitored in real time.

Preferably, the total load square of computational scheme in steps A, the load square size M of load is directly proportional to distance L and the load power P of load apart from power supply, and linear, and therefore, the total load square of circuit is the load square sum of each load on circuit:

unit is: kilowatt * km.P wherein _ifor the load power on i bar circuit in n bar circuit; l _ifor the distance between i bar circuit and former circuit in n bar circuit.By such mode, can calculate total load square M _t.

Preferably, near the circuit algorithm being in a good state of health obtaining in step D: obtain the polygonal region that current circuit all devices forms, by space, calculate, obtain in distance to a declared goal L, terminal on other circuit or tie point equipment, if existed, this terminal or tie point equipment place circuit can be used as circuit to be shunted.

Preferably, in step e, obtain load algorithm to be shunted: obtain the load that the circuit distance to be shunted of distance on circuit is less than L, it is the most approaching but be slightly larger than one or more loads (a plurality of loads belong to Yi Ge branch as far as possible) of Δ M that from these loads, traversal is obtained load square, as load to be shunted, by space, calculate and obtain the distance of load to be shunted to the distance of diverting route and tie point to power supply, thereby obtain the load square of minute stream load, the total load square of diverting route is the load square that former load square adds minute stream load.

Preferably, also comprise that electric load square detects with the layout load planning minimum load square of the applied research in planning of power supply and calculates at distribution line, comprises the following steps successively:

A. selecting a N to be measured load point, if load point type is all identical, is the measuring and calculating of simple and easy type load square, otherwise is the measuring and calculating of compound type load square;

B. simple and easy type load point optimal power supply coordinate calculates: set best coordinates (x, y), coordinates computed is put the load square M of each selected load point, guarantee that M is minimum, obtain the optimal power supply coordinate of minimum load square, optimal power supply coordinate (x, y) meets following equation:

$M=\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{p}_i\sqrt{{(x-x_i)}^2+{(y-y_i)}^2}\&RightArrow;\min ;$ P is the active power by circuit

If C. selected load point comprises large user and domestic consumer, need to calculate respectively optimal power supply point coordinate by large user and domestic consumer, and then calculate the optimal power supply point coordinate of all loads;

D. the optimal power supply point coordinate account form of large user and domestic consumer, with step B, obtains respectively optimal power supply point coordinate (x _c, y _c) and (x _s, y _s), the power supply point best placement of layouting is most two kinds of a certain coordinate points on character load prediction optimal power supply point linear position, optimal power supply point coordinate (x, y) meets following equation:

$\left.\begin{array}{c}\mathrm{\&Delta;s}=\sqrt{{(x_c-x_s)}^2+{(y_c-y_s)}^2}\\ \mathrm{\&Delta;s}\&CenterDot;k=\sqrt{{(x-x_c)}^2+{(y-y_c)}^2}\\ \mathrm{\&Delta;s}\&CenterDot;(1-k)=\sqrt{{(x-x_s)}^2+{(y-y_s)}^2}\\ 1-k>0\end{array}\right\};$

E. according to optimal power supply point cloth point coordinate (x, y), calculate the load square of each load point, and load moment ratio with the theory of all kinds of circuits, obtain the candidate line specifications and models suggestion of each load point.

Further, described selective circuit specifications and models specification is: tri-kinds of LJ-120, LJ-70 and LJ-50.The respectively corresponding 36 kilowatts of * kms of these three kinds of wire diameters, 26 kilowatts of * kms, 20 kilowatts of these three kinds of Mmax of * km.

Compared with prior art, advantage of the present invention is: utilize current electric network model, by the calculating of load square, to the shunting of load of the not good circuit of health degree, under the least possible change and Best Economy power circuit is designed or old circuit is transformed under designing.

Embodiment

Theoretical foundation of the present invention is, due under a certain permission loss of voltage condition, loads larger, and radius of electricity supply is less; Otherwise, to load less, radius of electricity supply is larger.Therefore, load and the relation of its radius of electricity supply, produced the concept of load square, and power is multiplied by load apart from the distance of power supply.

Load square=P*L(unit: kilowatt * km)

Wherein: P--power L--load is apart from the distance of power supply

Similar with moment, when electric current conducts in via line, due to the material of circuit itself, the difference of wire thickness, determined from the current/voltage away from power supply point just lower.So, while knowing the parameters such as wire gauge model and terminal load when us, just can obtain easily the situation of voltage drop, and the maximum delivery of different conductor distance and peak power output, this is all the foundation that we distribute same circuit or draw the reference that branch line provides.

The overhead transmission line of given electric pressure, total terminal load value of take is example, voltage drop, the peak power output of a certain terminal on the load square of computational scheme, maximum transmission distance and circuit.

ΔU%＝(R+X·tanθ)pl/(10U ²)?（1）

Wherein: R--line resistance; X--circuit induction reactance value; Tan θ--line power factor; U--is by the voltage of circuit; P--is by the active power of circuit; L--line length.

Because Δ U% is a calculating basis, so, usually with the unit quantity of p=1kW and l=1km, carry out value.

So, also can be write as: Δ U%=(R+Xtan θ)/(10U ²) (2)

According to concrete terminal, calculating corresponding terminal voltage reduces to:

ΔU＝ΔU%·P _i·l _i?（3）

Wherein: P _i--the load l of a certain terminal on circuit _i--on circuit, a certain terminal is to the distance of power supply point

Load square $M=\frac{(U_o-U_t\&CenterDot;\mathrm{\&lambda;})/U_o}{\mathrm{\&Delta;U}\%}---\left(4\right)$

Wherein: U _o--electric power output voltage U _tthe permissible variation voltage percentage of--rated voltage λ of loaded termination--loaded termination.

The maximum delivery distance of circuit:

L _max＝M/P _t?（5）

Wherein: P _t--the total terminal load on circuit

To the peak power output of a certain terminal on circuit, be:

P _imax=M/l _i?（6）

If, under the condition of maximum delivery distance and peak power output, the line load square obtaining is also maximum (M to precompute different circuits (built on stilts or cable) according to above-mentioned formula _max), so, when we run in the load situations about distributing of same power supply point more, we just can carry out by calculating " total load square " (M of these loads _t), with the line load square (M under this condition _max) relatively, judge whether the loss of voltage of these loads meets self rated voltage drop coefficient requirement, whether need circuit to change or the network of load is adjusted.

The computing method of total load square are: $M_t=\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{p}_i\&CenterDot;l_i---\left(7\right)$

Calculate after two kinds of load squares, simply and accurately the line security of guide field detects and the real work such as transformation.

We know, in electrical network, the line loss of arbitrary branch road i can be expressed as:

L in formula _i, ρ _ithe resistance coefficient that represents respectively line length and conductor material, J _i=I _is _irepresent economic current density, U _iwith

represent respectively voltage and power factor on branch road, P _iexpression is by the active power of branch road.

If electrical network has m bar branch road, the total active loss of the whole network is:

When carrying out power network far-seeing plan, load can only be also an approximate estimated value, under same electric pressure, and K _ican regard approx constant as, with scheme, not change.Like this, (9) formula just becomes:

${\mathrm{\&Delta;P}}_{\mathrm{\&Sigma;}}=K\underset{i=1}{\overset{m}{\mathrm{\&Sigma;}}}{P}_i{L}_i---\left(10\right)$

Above formula shows, as long as total load square

minimum, line loss is also minimum.

General each branch road length L _ibe known quantity, pressing economic current density selection electrical network conductor cross-section generally, total line loss has become each branch road through-put power P _ilinear representation.

In addition, press J _iselect cross section, certain through-put power P _i, the inevitable conductor cross-section S with a certain size _icorresponding.Load is apart from represent to consume again the volume V of conductor material on certain engineer's scale like this _i, that is:

$\underset{i=1}{\overset{m}{\mathrm{\&Sigma;}}}{P}_i{L}_i=K_1\underset{i=1}{\overset{m}{\mathrm{\&Sigma;}}}{V}_i---\left(11\right)$

Therefore

minimum, also represents that the total conductor material of electrical network consumes minimum.When transmission line of electricity once invest the price of major decision conductor material time, " total load square " minimum, also represents that once investment is minimum.

Be more than theoretical foundation of the present invention, when specifically for regional a setting, conventionally adopt a kind of distribution line to detect and the power supply planing method of layouting, take County Power Plant as plan objects, comprise the following steps:

A. search or select to carry out rack or the cable line of wireline inspection, calculate the total load square Mt of this circuit; M _tdistance l and load power p apart from power supply is directly proportional to load, and linear, and the total load square of circuit is the load square sum of each load on n bar circuit:

p wherein _ifor the load power on i bar circuit in n bar circuit; l _ifor the distance between i bar circuit and former circuit in n bar circuit.

B. by the theory load square Mmax with identical electric pressure, same size circuit, compare, draw the health status of current circuit;

If C. total load square Mt is greater than theoretical load square, but identical electric pressure, if other specification circuit theoretical negative lotus square can meet current line load, is changed the electric wire of different wire diameters; Tri-kinds of LJ-120, LJ-70 and LJ-50.The respectively corresponding 36 kilowatts of * kms of these three kinds of wire diameters, 26 kilowatts of * kms, 20 kilowatts of these three kinds of Mmax of * km.Just do not need to have divided stream load more in this case.

If D. step C does not meet, need the circuit shunting of load, by spatial analysis, obtain with current circuit apart from the n bar circuit being in a good state of health that is less than l as alternative can diverting route;

E. by circuit total load square Mt and theoretical load square Mmax, calculate the load square Δ M of current circuit overload load, by Δ M, obtain load to be shunted on current circuit, after calculated load shunting, the total load square of diverting route, and load moment ratio with the theory of diverting route, confirm that whether the diverting route after load shunting is healthy; Obtain the load that the circuit distance to be shunted of distance on circuit is less than l, from these loads, traversal is obtained the most approaching but one or more loads that are greater than Δ M of load square as load to be shunted; By space, calculated and obtained the distance of load to be shunted to the distance of diverting route and tie point to power supply, thereby obtain the load square of minute stream load, the total load square of diverting route is the load square that former load square adds shunting gained.

Load square=Δ M=(Mt-Mmax to be shunted)

F. to the N bar circuit after shunting, the health status after by increase-volume is monitored in real time.

By such method, can carry out simply distribution and the design of power circuit, overall simple and economy is especially beneficial to remote districts or older track remodelling.

The present invention also comprises that electric load square detects with the layout load planning minimum load square of the applied research in planning of power supply and calculates at distribution line, comprises the following steps successively:

A. selecting a N to be measured load point, if load point type is all identical, is the measuring and calculating of simple and easy type load square, otherwise is the measuring and calculating of compound type load square;

B. simple and easy type load point optimal power supply coordinate calculates: set best coordinates (x, y), coordinates computed is put the load square M of each selected load point, guarantee that M is minimum, obtain the optimal power supply coordinate of minimum load square, optimal power supply coordinate (x, y) meets following equation:

p is the active power by circuit

If C. selected load point comprises large user and domestic consumer, need to calculate respectively optimal power supply point coordinate by large user and domestic consumer, and then calculate the optimal power supply point coordinate of all loads;

D. the optimal power supply point coordinate account form of large user and domestic consumer, with step B, obtains respectively optimal power supply point coordinate (x _c, y _c) and (x _s, y _s), the power supply point best placement of layouting is most two kinds of a certain coordinate points on character load prediction optimal power supply point linear position, optimal power supply point coordinate (x, y) meets following equation:

$\left.\begin{array}{c}\mathrm{\&Delta;s}=\sqrt{{(x_c-x_s)}^2+{(y_c-y_s)}^2}\\ \mathrm{\&Delta;s}\&CenterDot;k=\sqrt{{(x-x_c)}^2+{(y-y_c)}^2}\\ \mathrm{\&Delta;s}\&CenterDot;(1-k)=\sqrt{{(x-x_s)}^2+{(y-y_s)}^2}\\ 1-k>0\end{array}\right\};$

E. according to optimal power supply point cloth point coordinate (x, y), calculate the load square of each load point, and load moment ratio with the theory of all kinds of circuits, obtain the candidate line specifications and models suggestion of each load point.

The foregoing is only specific embodiments of the invention, but technical characterictic of the present invention is not limited to this, any those skilled in the art is in the field of the invention, and the variation of doing or modification are all encompassed among the scope of the claims of the present invention.

Claims (6)

1. the distribution line planning and distribution transforming Optimization Method for Location-Selection based on load square theory, is characterized in that: comprise the following steps successively:

A. search or select to carry out the built on stilts or cable line of wireline inspection, the total load square M of computational scheme _t;

B. by the theory load square M with identical electric pressure, same size circuit _maxcompare, draw the health status of current circuit;

If total load square M C. _tbe greater than theoretical load square, but identical electric pressure, if other specification circuit theoretical negative lotus square can meet current line load, recommends to change wire diameter;

If D. step C does not meet, need the circuit shunting of load, by spatial analysis, to obtain with current circuit apart from the N bar circuit being in a good state of health that is less than L as can diverting route, the value of L is 200-500 rice;

E. by circuit total load square M _twith theory load square M _maxthe load square Δ M that calculates current circuit overload load, obtains load to be shunted on current circuit by Δ M, after calculated load shunting, the total load square of diverting route, and load moment ratio with the theory of diverting route, confirm that whether the diverting route after load shunting is healthy

F. calculate N bar can diverting route health status after by increase-volume, and list shows.

2. the distribution line planning and distribution transforming Optimization Method for Location-Selection based on load square theory as claimed in claim 1, it is characterized in that: the total load square of computational scheme in steps A, the load square size M of load is directly proportional to distance L and the load power P of load apart from power supply, and linear, therefore, the total load square of circuit is the load square sum of each load on circuit:

unit is: kilowatt * km.

3. the distribution line planning and distribution transforming Optimization Method for Location-Selection based on load square theory as claimed in claim 1, it is characterized in that: near the circuit algorithm being in a good state of health obtaining in step D: obtain the polygonal region that current circuit all devices forms, by space, calculate, obtain in distance to a declared goal L, terminal on other circuit or tie point equipment, if existed, this terminal or tie point equipment place circuit can be used as circuit to be shunted.

4. the distribution line planning and distribution transforming Optimization Method for Location-Selection based on load square theory as claimed in claim 1, it is characterized in that: in step e, obtain load algorithm to be shunted: obtain the load that the circuit distance to be shunted of distance on circuit is less than L, it is the most approaching but be slightly larger than one or more loads (a plurality of loads belong to Yi Ge branch as far as possible) of Δ M that from these loads, traversal is obtained load square, as load to be shunted, by space, calculate and obtain the distance of load to be shunted to the distance of diverting route and tie point to power supply, thereby obtain the load square of minute stream load, the total load square of diverting route is the load square that former load square adds minute stream load.

5. the distribution line planning and distribution transforming Optimization Method for Location-Selection based on load square theory as claimed in claim 1, it is characterized in that: also comprise that electric load square detects with the layout load planning minimum load square of the applied research in planning of power supply and calculates at distribution line, comprises the following steps successively:

A. selecting a N to be measured load point, if load point type is all identical, is the measuring and calculating of simple and easy type load square, otherwise is the measuring and calculating of compound type load square;

B. simple and easy type load point optimal power supply coordinate calculates: set best coordinates (x, y), coordinates computed is put the load square M of each selected load point, guarantee that M is minimum, obtain the optimal power supply coordinate of minimum load square, optimal power supply coordinate (x, y) meets following equation:

$M=\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{p}_i\sqrt{{(x-x_i)}^2+{(y-y_i)}^2}\&RightArrow;\min ;$ P is the active power by circuit

If C. selected load point comprises large user and domestic consumer, need to calculate respectively optimal power supply point coordinate by large user and domestic consumer, and then calculate the optimal power supply point coordinate of all loads;

D. the optimal power supply point coordinate account form of large user and domestic consumer, with step B, obtains respectively optimal power supply point coordinate (x _c, y _c) and (x _s, y _s), the power supply point best placement of layouting is most two kinds of a certain coordinate points on character load prediction optimal power supply point linear position, optimal power supply point coordinate (x, y) meets following equation:

$\left.\begin{array}{c}\mathrm{\&Delta;s}=\sqrt{{(x_c-x_s)}^2+{(y_c-y_s)}^2}\\ \mathrm{\&Delta;s}\&CenterDot;k=\sqrt{{(x-x_c)}^2+{(y-y_c)}^2}\\ \mathrm{\&Delta;s}\&CenterDot;(1-k)=\sqrt{{(x-x_s)}^2+{(y-y_s)}^2}\\ 1-k>0\end{array}\right\};$

E. according to optimal power supply point cloth point coordinate (x, y), calculate the load square of each load point, and load moment ratio with the theory of all kinds of circuits, obtain the candidate line specifications and models suggestion of each load point.

6. the distribution line planning and distribution transforming Optimization Method for Location-Selection based on load square theory as claimed in claim 5, is characterized in that: described selective circuit specifications and models specification is: tri-kinds of LJ-120, LJ-70 and LJ-50.