CN103559553B - Distributing line planning and distribution transform site selection optimizing method based on load moment theory - Google Patents
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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
Technical field
The present invention relates to field of power, particularly relate to distribution line based on load moment theory planning and distribution transforming addressing
Optimization method.
Background technology
At present, owing in County Power Plant administrative area, electric power basis is the most also compared weak with planning, power supply capacity is weak
Being still distinct issues, that causes this situation has two reasons: one is, administrative area is big so that often a circuit is born
Lotus terminal is many, line loss big, and low-voltage causes the power supply capacity deficiency problem on whole piece circuit；Two are, line terminal power load
The peak valley time substantially and concentrates, and in the case of circuit and power transformation finite capacity and layout are difficult to adjust in time, overload causes joins
Electricity equipment fault, damage, power failure phenomenon is universal.To this, it would be desirable to circuit is optimized.Current power network planning, past
The past size position according to power load and the relative distance with power supply thereof, screen the side that economic indicator is good by the way of artificial
Case.But such relating to, often adds too much subjective factors.
Further, patent of invention " a kind of transmission and distribution line based on RFID of Application No. " CN201110381625.3 "
Pipeline equipment management system and management method thereof " in have been disclosed for the planing method of a kind of relatively advanced distribution line, this
Bright belong to field of power, it is provided that a kind of electric line equipment management system based on RFID and management method thereof, adopt
With the Radio Frequency ID card of low cost as the distinguished symbol of transmission and distribution line pipeline equipment, its volume is little, lightweight, corrosion-resistant, the life-span is long,
Mobile handheld terminal has GPS function so that reads the coding of Radio Frequency ID card, more accurately, conveniently, on-the-spot can input various works
Condition describes, and relevant information data can be stored by memory module, after using this equipment to take pictures, these is had
The track data of id information is sent to data server and permanently stores, and has achieved line facility and various state owned property
The management of effect ground and record, reduce management cost, it is possible to effectively carry out management of state-owned property and planning, it is to avoid the secondary of repetition
Investment and equipment lose the generation of maintenance condition.
But such equipment cost is big, and maintenance cost is the highest, it is difficult to promote.
In order to conscientiously improve the delivery quality in territory, vast county, it is ensured that science during all kinds of transformation of distribution at county level, Wo Menxu
Want the more economically effective wiring method of one.The optimization that electric power networks sets up is one of important process content of power planning,
Its core is intended to seek the electric power networks that structure is optimal, it is therefore an objective to be receive that the loss of electrical network is minimum, material saves most, once invests
Most economical.
Therefore we need some to quantify, the standard measured and method carry out the optimization that auxiliary power network sets up, and seek
Seek the electric power networks that structure is optimal, it is therefore an objective to be receive that the loss of electrical network is minimum, material saves most, it is most economical once to invest.
Summary of the invention
It is an object of the invention to when power circuit transformation or newly-increased planning, due to the reality of circuit or distant view load
Know, by the load moment of line load is calculated, detection is provided for track remodelling, such as thread-changing footpath or load cutover and analyzes, for
Newly-increased planning provides optimum load point to layout and calculates and line specificities type selecting.
In order to solve above-mentioned technical problem, the present invention is achieved by the following technical solutions:
Distribution line based on load moment theory planning and distribution transforming Optimization Method for Location-Selection, right with County Power Plant for planning
As, comprise the following steps:
A. search or select rack or the cable run of wireline inspection to be carried out, calculate the total load square M of this circuitt；
B. by with identical electric pressure, theoretical load moment M of same size circuitmaxCompare, draw current line
Health status；
If C. total load square MtMore than theoretical load moment, but identical electric pressure, other gauge wire theory load moment
If current line load can be met, then change the electric wire in the most collinear footpath；
If D. step C is unsatisfactory for, then need circuit is carried out load shunting, by spatial analysis, obtain and work as front
The road distance n bar circuit being in a good state of health less than l alternately can diverting route；
E. by circuit total load square MtWith theoretical load moment MmaxIt is calculated the load moment Δ of current line overload load
M, obtains load to be shunted on current line by Δ M, after calculated load shunting, the total load square of diverting route, and with shunting
The theoretical load moment ratio of circuit relatively, confirms that the diverting route after load shunting is the most healthy；
F. the N bar circuit after shunting is monitored in real time by the health status after increase-volume.
Preferably, calculate the total load square of circuit in step, load moment size M of load and load distance power supply away from
It is directly proportional from L and load power P, and linear, and therefore, the total load square of circuit is the load moment of each load on circuit
Sum:Unit is: kilowatt * km.Wherein piFor the load power on i-th line road in n bar circuit；liFor n
Distance between i-th line road and former circuit in bar circuit.Total load square M can be calculated by such modet。
Preferably, obtain in step D near the assignment algorithm that is in a good state of health: obtain current line all devices structure
The polygonal region become, by SPATIAL CALCULATION, obtains in distance to a declared goal L, the terminal on other circuit or junction point equipment, if
Exist, then this terminal or junction point equipment place circuit can be used as circuit to be shunted.
Preferably, step E obtains load algorithm to be shunted: on acquisition circuit, distance circuit to be shunted distance is less than L
Load, from these loads traversal obtain load moment closest to but one or more loads slightly larger than Δ M (multiple loads are to the greatest extent
Amount belongs to a branch), as load to be shunted, obtain load to be shunted to the distance of diverting route and company by SPATIAL CALCULATION
Contact is to the distance of power supply, thus obtains shunting the load moment of load, and the total load square of diverting route is former load moment and adds
The load moment of shunting load.
Preferably, also include that electric load square detects the load of the applied research layouted in planning with power supply at distribution line
Planning minimum load square measuring and calculating, comprises the following steps successively:
A. select N number of load point to be measured, if load point type is the most identical, be then the measuring and calculating of simple type load moment,
Otherwise calculate for compound type load moment；
B. simple type load point optimal power supply coordinate calculates: (x, y), coordinates computed point selects to each to set best coordinates
Load moment M of constant load point, it is ensured that M is minimum, i.e. obtains the optimal power supply coordinate of minimum load square, and optimal power supply coordinate (x, y)
Meet below equation:
piFor the load power on i-th line road in n bar circuit
If C. selected load point comprises large user and domestic consumer, then need by large user and domestic consumer respectively based on
Calculate optimal power supply point coordinates, calculate the optimal power supply point coordinates of all loads the most again；
D. the optimal power supply point coordinates calculation of large user and domestic consumer is with step B, respectively obtains optimal power supply point
Coordinate (xc,yc) and (xs,ys), then power supply point best placement of layouting most is two kinds of character load prediction optimal power supply point linear positions
On a certain coordinate points, optimal power supply point coordinates (x, y) meets below equation:
E. according to optimal power supply point cloth point coordinates (x, y) calculates the load moment of each load point, and with the theory of all kinds of circuits
Load moment compares, and obtains the candidate line specifications and models suggestion of each load point.
Further, described selective line specificities model specification is: LJ-120, LJ-70 and LJ-50
Three kinds.These three line footpath the most corresponding 36 kilowatts of * kms, 26 kilowatts of * kms, 20 kilowatts of * km these three Mmax.
Compared with prior art, the invention have the advantage that and utilize current electric network model, by the calculating of load moment, right
The best circuit of health degree carries out load shunting, to power circuit under the fewest change and under Best Economy design
Design or old circuit is transformed.
Detailed description of the invention
The theoretical foundation of the present invention is, owing to, under the conditions of a certain permission loss of voltage, load is the biggest, radius of electricity supply is more
Little；Otherwise, load is the least, and radius of electricity supply is the biggest.Therefore, load and the relation of its radius of electricity supply, create the concept of load moment,
I.e. power is multiplied by the distance of load distance power supply.
Load moment=P*L (unit: kilowatt * km)
Wherein: the distance of P--power L--load distance power supply
Similar with moment, electric current is when via line is conducted, and due to material, the difference of wire thickness of circuit itself, determines
The current/voltage away from power supply point is the lowest.So, when it is understood that parameter and end loads such as wire gauge models
Time, it becomes possible to it is easily obtained the situation of voltage drop, and the maximum delivery distance of different conductor and peak power output, this
Individual all distribute same circuit for us or draw the foundation of reference that branch line provides.
With given electric pressure, total end loads value an overhead transmission line as example, calculate the load moment of circuit, maximum
The voltage drop of a certain terminal, peak power output on transmission distance and circuit.
Δ U%=(R+X tan θ) pl/ (10U2) (1)
Wherein: R--line resistance；X--circuit induction reactance value；Tan θ--line power factor；The U--voltage by circuit；
The p--active power by circuit；L--line length.
Owing to Δ U% is a calculating basis, so, usually carry out value with the unit quantity of p=1kW and l=1km.
So, it is also possible to write as: Δ U%=(R+X tan θ)/(10U2) (2)
Calculate corresponding terminal voltage according to concrete terminal to reduce to:
Δ U=Δ U% Pi·li (3)
Wherein: Pi--the load l of a certain terminal on circuiti--on circuit, a certain terminal is to the distance of power supply point
Load moment
Wherein: Uo--electric power output voltage UtThe tolerance voltage of--rated voltage λ of loaded termination--loaded termination
Percentage ratio.
The maximum delivery distance of circuit:
Lmax=M/Pt (5)
Wherein: Pt--the total end loads on circuit
To the peak power output of terminal a certain on circuit it is:
Pimax=M/li (6)
If precomputing different circuit (built on stilts or cable) in maximum delivery distance and according to above-mentioned formula
Under conditions of big output, the line load square obtained also is maximum (Mmax), then, when we run into same power supply
In the case of the many distributions of load of point, we just can carry out " total load square " (M of these loads by calculatingt), with this
Line load square (M under partmax) compare, it is determined that whether the loss of voltage of these loads meets self rated voltage drop coefficient requirements,
The need of circuit being replaced or the network of load being adjusted.
The computational methods of total load square are:
After calculating two kinds of load moment, can simply and accurately the line security detection of guide field and the actual work such as transformation
Make.
It is known that the line loss of arbitrary branch road i can be expressed as in electrical network:
L in formulai、ρiRepresent line length and the resistance coefficient of conductor material, J respectivelyi=Ii/SiRepresent that economic current is close
Degree, UiWithRepresent the voltage on branch road and power factor, P respectivelyiRepresent the active power by branch road.
If electrical network has m bar branch road, then the total active loss of the whole network is:
When carrying out power network perspective long-term plan, load also can only be the estimated value of an approximation, under same electric pressure,
KiConstant can be regarded approx as, do not change with scheme.So, (9) formula just becomes:
Above formula shows, if total load squareMinimum, then line loss is also minimum.
General each leg length LiIt is known quantity, in the ordinary circumstance selecting electrical network conductor cross-section by economic current density
Under, total line loss has become each branch road through-put power PiLinear representation.
It addition, press JiSelect cross section, certain through-put power Pi, the inevitable conductor cross-section S with a certain sizeiCorresponding.So negative
Lotus consumes the volume V of conductor material away from representing again on certain scalei, it may be assumed that
ThereforeMinimum, also illustrates that the conductor material consumption minimum that electrical network is total.When the once investment of transmission line of electricity is main
When determining the price of conductor material, " total load square " is minimum, also illustrates that and once invests minimum.
Be above the theoretical basis of the present invention, be specific to one regional when arranging, generally use a kind of distribution wire
Planing method that road is detected and power supply is layouted, with County Power Plant as plan objects, comprises the following steps:
A. search or select rack or the cable run of wireline inspection to be carried out, calculate the total load square Mt of this circuit；Mt
It is directly proportional to distance l and load power p of load distance power supply, and linear, i.e. and the total load square of circuit is on n bar circuit
The load moment sum of each load:Wherein piFor the load power on i-th line road in n bar circuit；liFor n
Distance between i-th line road and former circuit in bar circuit.
B. by with identical electric pressure, same size circuit theoretical load moment Mmax compared with, draw current line
Health status；
C. if total load square Mt is more than theoretical load moment, but identical electric pressure, other gauge wire theory load moment
If current line load can be met, then change the electric wire in the most collinear footpath；LJ-120, LJ-70 and LJ-50 tri-kinds.These three
Line footpath the most corresponding 36 kilowatts of * kms, 26 kilowatts of * kms, 20 kilowatts of * km these three Mmax.In this case avoid the need for
Shunt load again.
If D. step C is unsatisfactory for, then need circuit is carried out load shunting, by spatial analysis, obtain and work as front
The road distance n bar circuit being in a good state of health less than l alternately can diverting route；
E. the load moment of current line overload load it is calculated by circuit total load square Mt and theoretical load moment Mmax
Δ M, obtains load to be shunted on current line by Δ M, after calculated load shunting, the total load square of diverting route, and with point
The theoretical load moment ratio of Flow Line relatively, confirms that the diverting route after load shunting is the most healthy；Obtain distance on circuit to be shunted
The circuit distance load less than l, from these loads traversal obtain load moment closest to but more than one or more loads of Δ M
As load to be shunted；By SPATIAL CALCULATION obtain load to be shunted to the distance of diverting route and junction point to power supply away from
From, thus obtaining shunting the load moment of load, the total load square of diverting route is the former load moment load plus shunting gained
Square.
Load moment to be shunted=Δ M=(Mt-Mmax)
F. the N bar circuit after shunting is monitored in real time by the health status after increase-volume.
By such method, distribution and the design of power circuit can be carried out simply, overall simple and economical, especially
It is beneficial to from far-off regions or older track remodelling.
Present invention additionally comprises the load of the applied research that electric load square is layouted in planning with power supply in distribution line detection
Planning minimum load square measuring and calculating, comprises the following steps successively:
A. select N number of load point to be measured, if load point type is the most identical, be then the measuring and calculating of simple type load moment,
Otherwise calculate for compound type load moment；
B. simple type load point optimal power supply coordinate calculates: (x, y), coordinates computed point selects to each to set best coordinates
Load moment M of constant load point, it is ensured that M is minimum, i.e. obtains the optimal power supply coordinate of minimum load square, and optimal power supply coordinate (x, y)
Meet below equation:piFor the load merit on i-th line road in n bar circuit
Rate；
If C. selected load point comprises large user and domestic consumer, then need by large user and domestic consumer respectively based on
Calculate optimal power supply point coordinates, calculate the optimal power supply point coordinates of all loads the most again；
D. the optimal power supply point coordinates calculation of large user and domestic consumer is with step B, respectively obtains optimal power supply point
Coordinate (xc,yc) and (xs,ys), then power supply point position of most preferably layouting is two kinds of character load prediction optimal power supply point linear positions
On a certain coordinate points, optimal power supply point coordinates (x, y) meets below equation:
E. according to optimal power supply point cloth point coordinates (x, y) calculates the load moment of each load point, and with the theory of all kinds of circuits
Load moment compares, and obtains the candidate line specifications and models suggestion of each load point.
The foregoing is only the specific embodiment of the present invention, but the technical characteristic of the present invention is not limited thereto, Ren Heben
The technical staff in field is in the field of the invention, and change or the modification made all are contained among the scope of the claims of the present invention.
Claims (6)
1. distribution line based on load moment theory planning and distribution transforming Optimization Method for Location-Selection, it is characterised in that: include following successively
Step:
A. search or select the built on stilts of wireline inspection to be carried out or cable run, calculating the total load square M of circuitt；
B. by with identical electric pressure, theoretical load moment M of same size circuitmaxCompare, draw the health of current line
Situation；
If C. total load square MtMore than theoretical load moment, but identical electric pressure, other gauge wire theory load moment can meet
Current line load, then recommend more thread-changing footpath；
If D. identical electric pressure in step C, if other gauge wire theory load moment can not meet current line load,
Then need circuit is carried out load shunting, by spatial analysis, obtain and current line distance being in a good state of health less than L
N bar circuit as can diverting route, the value of L is 200-500 rice；
E. by circuit total load square MtWith theoretical load moment MmaxIt is calculated the load moment Δ M of current line overload load, logical
Cross Δ M and obtain load to be shunted on current line, after calculated load shunting, the total load square of diverting route, and and diverting route
Theoretical load moment ratio relatively, confirm load shunting after diverting route the most healthy,
F. calculate N bar can diverting route by the health status after increase-volume, and list shows.
2. distribution line based on load moment theory planning as claimed in claim 1 and distribution transforming Optimization Method for Location-Selection, its feature
It is: calculate the total load square of circuit in step, load moment size M of load and distance L of load distance power supply and load merit
Rate P is directly proportional, and linear, therefore, and the load moment sum that total load square is each load on circuit of circuit:Unit is: kilowatt * km.
3. distribution line based on load moment theory planning as claimed in claim 1 and distribution transforming Optimization Method for Location-Selection, its feature
It is: the assignment algorithm being in a good state of health near obtaining in step D: obtain the polygon that current line all devices is constituted
Region, by SPATIAL CALCULATION, obtains in distance to a declared goal L, the terminal on other circuit or junction point equipment, if it is present this
Terminal or junction point equipment place circuit can be used as circuit to be shunted.
4. distribution line based on load moment theory planning as claimed in claim 1 and distribution transforming Optimization Method for Location-Selection, its feature
It is: in step E, obtain load algorithm to be shunted: obtain the distance circuit to be shunted distance load less than L on circuit, from this
In a little loads traversal obtain load moment closest to but one or more loads slightly larger than Δ M, as load to be shunted, by sky
Between calculate and obtain load to be shunted to the distance of diverting route and junction point to the distance of power supply, thus obtain bearing of shunting load
Lotus square, the total load square of diverting route is the former load moment load moment plus shunting load.
5. distribution line based on load moment theory planning as claimed in claim 1 and distribution transforming Optimization Method for Location-Selection, its feature
It is: also include that electric load square detects the load planning minimal negative of the applied research layouted in planning with power supply at distribution line
Lotus square is calculated, and comprises the following steps successively:
A. select N number of load point to be measured, if load point type is the most identical, be then the measuring and calculating of simple type load moment, otherwise
Calculate for compound type load moment；
B. simple type load point optimal power supply coordinate calculates: (x, y), coordinates computed point is selected negative to each to set best coordinates
Load moment M of lotus point, it is ensured that M is minimum, i.e. obtains the optimal power supply coordinate of minimum load square, and (x y) meets optimal power supply coordinate
Below equation:
piFor the load power on i-th line road in n bar circuit；
If C. selected load point comprises large user and domestic consumer, then need to calculate respectively by large user and domestic consumer
Good power supply point coordinate, calculates the optimal power supply point coordinates of all loads the most again；
D. the optimal power supply point coordinates calculation of large user and domestic consumer is with step B, respectively obtains optimal power supply point coordinates
(xc,yc) and (xs,ys), then power supply point position of most preferably layouting is on two kinds of character load prediction optimal power supply point linear positions
A certain coordinate points, optimal power supply point coordinates (x, y) meets below equation:
E. according to optimal power supply point cloth point coordinates (x, y) calculates the load moment of each load point, and with the theoretical load of all kinds of circuits
Moment ratio relatively, obtains the candidate line specifications and models suggestion of each load point.
6. distribution line based on load moment theory planning as claimed in claim 5 and distribution transforming Optimization Method for Location-Selection, its feature
It is: described selective line specificities model specification is: LJ-120, LJ-70 and LJ-50 tri-kinds.
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| CN118365100A (en) * | 2024-06-19 | 2024-07-19 | 国网山东省电力公司滨州供电公司 | Reference power grid planning method, system and medium based on load moment and admission domain |
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