CN110765564B - Load moment-based configuration position correction method and device - Google Patents
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Abstract
The application provides a load moment-based configuration position correction method and a device, wherein the method comprises the steps of firstly obtaining a plurality of load point coordinates and load power in a load group, and determining a load center point coordinate; determining the primary selection distance from each load point coordinate to the load center point coordinate and the qualified radius of the load voltage respectively, and comparing the primary selection distance with the qualified radius of the load voltage; and if the primary selection distance is larger than the qualified radius of the load voltage, making circles according to the qualified radius of the load voltage by taking each load point as a circle center, and correcting the distribution transformer position in an intersection area of the multiple made circles. The method corrects the allocation position through the load moment, and can effectively avoid the condition that the voltage exceeds the lower limit so as to meet the voltage qualification condition.
Description
Technical Field
The application relates to the technical field of planning and construction of power distribution networks of power systems, in particular to a distribution position correction method and device based on load moment.
Background
Distribution transformer, abbreviated as distribution transformer, refers to a static electric appliance in a distribution system for converting alternating voltage and current according to electromagnetic induction law and transmitting alternating electric energy. The installation position of the distribution transformer is the distribution transformer position. In the planning and construction process of the power system, position selection is an important link, and the rationality of position selection can directly influence the line investment cost, the system operation economy, the power quality and the like. The primary principle of the allocation position selection is to approach the load center, and then the optimization selection is further carried out by taking the minimum investment as the basic principle.
Therefore, the traditional power distribution network planning construction method comprises the steps of firstly calculating a load center position according to a load point position by adopting a load moment method, and selecting a distribution transformer at the load center position; and then setting up power transmission facilities to the peripheral area based on the load center position.
However, in actual engineering, the situation that a distribution line is erected in a conditional straight line rarely occurs, and a larger deviation exists between an actual line and a theoretical distance, so that a larger error exists between a calculated theoretical voltage drop and an actual voltage change, and the situation that a load center is used as an addressing position of a distribution transformer is insufficient, and in actual application, certain load point voltage drops may exceed an allowable range is caused. Therefore, the distribution position initially selected by the load center does not necessarily meet the voltage qualification condition, and the distribution position needs to be further corrected.
Disclosure of Invention
The application provides a load moment-based distribution position correction method and device, which are used for solving the problem that the traditional distribution position selection method does not meet the voltage qualification condition.
In one aspect, the present application provides a method for correcting a displacement based on a load moment, including:
acquiring a plurality of load point coordinates and load power in a load group;
determining a load center point coordinate, wherein the load center point coordinate is a coordinate value calculated by a plurality of load point coordinates according to a gravity moment equation;
determining the initial selection distance from each load point coordinate to the load center point coordinate;
calculating the qualified radius of the load voltage of each load point by using the load power of each load point and the actual line parameters;
comparing the primary selection distance with the qualified radius of the load voltage;
and if the primary selection distance is larger than the qualified radius of the load voltage, making circles according to the qualified radius of the load voltage by taking each load point as a circle center, and correcting the distribution transformer position in an intersection area of the multiple made circles.
Optionally, after the step of comparing the preliminary selected distance with the qualified radius of the load voltage, the method further includes:
and if the initial selection distance is smaller than or equal to the qualified radius of the load voltage, taking the coordinates of the load center point as the distribution transformer position.
Optionally, in the step of determining the load center point coordinate, the load center point coordinate calculates a coordinate value according to the following formula:
wherein P is i Load power for the ith load point; (x) i ，y i ) The i-th load point coordinate; (x, y) is the load center point coordinates.
Optionally, the initial selection distance is an absolute distance between the load point coordinates and the load center point coordinates; in the step of determining the primary selection distance from each load point coordinate to the load center point coordinate, calculating the primary selection distance according to the following formula;
in (x) i ，y i ) The i-th load point coordinate; (x, y) is the load center point coordinates.
Optionally, the step of calculating the qualified radius of the load voltage of each load point by using the load power of each load point and the actual line parameters includes a resistance per unit length and an inductance per unit length.
Optionally, the actual line parameter further includes an actual line length; the method further comprises the steps of:
acquiring the actual line length;
the voltage drop is calculated using the load power at each load point, the actual line length, the resistance per unit length and the inductance per unit length.
Alternatively, the method calculates the pressure drop according to the following formula:
wherein P is i Load power for the i-th load point; l (L) i The distance from the ith load point to the load center point is the i-th load point; u (U) 0 Is the output voltage of the distribution transformer; r is R 0 The resistance is the resistance of the unit length of the wire; x is X 0 Inductance per unit length of wire; tan θ is the power factor tangent.
Optionally, the maximum allowable range of the voltage drop is-10% of the outlet voltage of the distribution transformer; the method calculates the qualified radius of the load voltage of each load point according to the following formula:
wherein P is i Load power for the i-th load point; u (U) 0 Is the output voltage of the distribution transformer; r is R 0 The resistance is the resistance of the unit length of the wire; x is X 0 Inductance per unit length of wire; tan θ is the power factor tangent.
Optionally, in the step of correcting the distribution transformer position in the intersection area of the plurality of circles, coordinates of the load center point in the intersection area are preferentially used as the distribution transformer position.
On the other hand, the application also provides a load moment-based positioning position correction device, which comprises:
fu Gequn obtaining module for obtaining coordinates of multiple load points and load power in load group;
the center point coordinate module is used for determining a load center point coordinate, wherein the load center point coordinate is a coordinate value calculated by a plurality of load point coordinates according to a gravity moment equation;
the initial selection distance determining module is used for determining initial selection distances from the coordinates of each load point to the coordinates of the load center point;
the accord with the qualified radius calculation module of the voltage, is used for using the load power of each load point, actual circuit parameter to calculate the qualified radius of the load voltage of each load point;
the comparison module is used for comparing the primary selection distance with the qualified radius of the load voltage;
and the position correction module is used for making circles according to the qualified radius of the load voltage by taking each load point as a circle center if the primary selection distance is larger than the qualified radius of the load voltage, and correcting the distribution transformer positions in the intersection areas of the made circles.
According to the technical scheme, the application provides a load moment-based position correction method and a load moment-based position correction device, wherein the method comprises the steps of firstly acquiring a plurality of load point coordinates and load power in a load group, and determining a load center point coordinate; determining the primary selection distance from each load point coordinate to the load center point coordinate and the qualified radius of the load voltage respectively, and comparing the primary selection distance with the qualified radius of the load voltage; and if the primary selection distance is larger than the qualified radius of the load voltage, making circles according to the qualified radius of the load voltage by taking each load point as a circle center, and correcting the distribution transformer position in an intersection area of the multiple made circles. The method corrects the allocation position through the load moment, and can effectively avoid the condition that the voltage exceeds the lower limit so as to meet the voltage qualification condition.
Drawings
In order to more clearly illustrate the technical solution of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a flow chart of a load moment-based configuration position correction method of the present application;
FIG. 2 is a schematic diagram of a load center point of the present application;
FIG. 3 is a schematic flow chart of the pressure drop determination of the present application;
FIG. 4 is a schematic view of the modified positioning device according to the present application;
FIG. 5 is a schematic diagram of a load moment-based configuration position correction device according to the present application.
Detailed Description
Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the examples below do not represent all embodiments consistent with the application. Merely exemplary of systems and methods consistent with aspects of the application as set forth in the claims.
Referring to fig. 1, a flow chart of a method for correcting a position of a position location based on a load moment according to the present application is shown. As can be seen from fig. 1, the configuration position correction method provided by the present application includes the following steps:
s1: and acquiring a plurality of load point coordinates and load power in the load group.
In the technical scheme provided by the application, the load group refers to a set formed by a plurality of loads in the range of the power distribution network to be planned, and each load can represent electric equipment in the practical application environment. In the load group, each load corresponds to a position, i.e. has load point coordinates. The load power is the calculated power of each load in the load point and can correspond to the maximum power of the electric equipment.
The load group consists of n loads, and the calculated power of each load is P 1 、P 2 、P 3 、……、P n The coordinates of each load point are: p (P) 1 (x 1 ,y 1 )、P 2 (x 2 ,y 2 )、P 3 (x 3 ,y 3 )……P n (x n ,y n )。
The load point coordinates can be longitude and latitude of addresses corresponding to the load points, or a rectangular coordinate system is built in the range of the power distribution network to be planned, and the load point coordinates consist of coordinate values corresponding to the built coordinate system.
For example: in practical application, a plurality of load points P in the same coordinate system 1 、P 2 、P 3 、P 4 、P 5 、P 6 The load point coordinates and the coincidence power of (1) are respectively:
P 1 =50 kW, load point coordinates (70, 170);
P 2 =35 kW, load point coordinates (110,100);
P 3 =13 kW, load point coordinates (36, 80);
P 4 =18 kW, load point coordinates (165,60);
P 5 =45 kW, load point coordinates (260,80);
P 6 =43 kW, load point coordinates (250,160).
S2: and determining the coordinates of the load center point.
After the coordinates of the load points in the coincidence group are obtained, center of gravity calculation can be performed according to the coordinates of the load points and corresponding calculation power, and the coordinates of the load center points are determined. That is, the load center point coordinates are coordinate values calculated by the plurality of load point coordinates according to the gravity moment equation.
The gravity moment equation is as follows:
(∑P i )x＝∑(P i x i )；
(∑P i )y＝∑(P i y i )；
the gravity moment equation is converted, and a calculation formula of the center point coordinate can be obtained as follows:
wherein P is i Load power for the ith load point; (x) i ，y i ) The i-th load point coordinate; (x, y) is the load center point coordinates.
Taking the coincidence point coordinates in the above example as an example, as shown in fig. 2, the load center coordinates are:
the load center point coordinate (163,103) is calculated and obtained, and can be used as a primary distribution transformer position, namely an initial distribution transformer installation position.
S3: and determining the initial selection distance from each load point coordinate to the load center point coordinate.
In the application, the initial selection distance is the absolute distance between each load point and the load center point, and the specific calculation mode can be as follows:
in (x) i ，y i ) The i-th load point coordinate; (x, y) is the load center point coordinates.
For example, P is calculated separately 1 、P 2 、P 3 、P 4 、P 5 、P 6 The absolute distance from the load center point is obtained as follows:
s4: and calculating the qualified radius of the load voltage of each load point by using the load power of each load point and the actual line parameters.
The application can calculate the qualified radius of the load voltage of each load point according to the load power of each load point and the actual line parameter while calculating the primary selection distance, so as to compare the primary selection distance with the qualified radius of the load voltage later and determine whether the primary selection change position needs to be corrected.
The application comprehensively considers the influence of the actual line on the power supply state, and the resistance and the inductance in the line can generate voltage drop on the transmitted voltage to influence the power transmission effect, so that the parameters of the actual line comprise the resistance and the inductance in unit length and the length of the actual line.
In some embodiments of the present application, to determine the acceptable radius of the load voltage, the voltage drop at each load point when power is supplied may also be calculated to ensure that each load point is capable of supplying the appropriate power supply voltage. Thus, as shown in fig. 3, the method further comprises:
s41: acquiring the actual line length;
s42: the voltage drop is calculated using the load power at each load point, the actual line length, the resistance per unit length and the inductance per unit length.
In practical application, the length of the line required in practical operation can be calculated according to the line laying form in the range of the power distribution network to be planned. For example, the actual wires are arranged in an L shape, and the lengths of the two sides of the L-shaped wires need to be accumulated and calculated to obtain the actual wire lengths.
After the actual line length is obtained, the voltage drop can be further calculated according to the actual line length, the resistance per unit length and the inductance per unit length. And calculating the obtained voltage drop, and determining the qualified radius of the load voltage of each load point. I.e. the furthest distance between the load point and the load center point when the pressure drop is at its maximum.
The method may calculate the pressure drop as follows:
wherein P is i Load power for the i-th load point; l (L) i The distance from the ith load point to the load center point is the i-th load point; u (U) 0 Is the output voltage of the distribution transformer; r is R 0 The resistance is the resistance of the unit length of the wire; x is X 0 Is a guideInductance per unit length of wire; tan θ is the power factor tangent.
Since the allowable deviation of the 220V single-phase supply voltage should be +7% to-10% of the rated voltage, that is, the minimum voltage allowed by the 220V single-phase supply voltage when reaching the load end is 220-220×10% =198V, and the maximum voltage drop is 22V, that is:
the calculation formula of the qualified radius of the load voltage can be obtained by transforming the above formula, namely the maximum allowable range of the voltage drop is-10% of the outlet voltage of the distribution transformer; the method calculates the qualified radius of the load voltage of each load point according to the following formula:
wherein P is i Load power for the i-th load point; u (U) 0 Is the output voltage of the distribution transformer; r is R 0 The resistance is the resistance of the unit length of the wire; x is X 0 Inductance per unit length of wire; tan θ is the power factor tangent.
For example, the load power factor tangent tan θ=0.49, the wire unit length resistance R 0 Wire unit length inductance x=0.25 0 =0.3, the load voltage qualification radius corresponding to each load point is calculated as follows:
s5: and comparing the initially selected distance with the qualified radius of the load voltage.
At the time of calculating and obtaining the primary selection distance l i And a load voltage qualified radius l i And then, comparing the initial selection distance with the qualified radius of the load voltage, namely determining whether the initial selection distance can meet the requirement of the qualified radius of the load voltage under the condition of maximum allowable voltage drop.
S6: and if the primary selection distance is larger than the qualified radius of the load voltage, making circles according to the qualified radius of the load voltage by taking each load point as a circle center, and correcting the distribution transformer position in an intersection area of the multiple made circles.
In practice, if l i ＜l i The initial position is considered to be unable to meet the requirement of qualified voltage, and l' is taken i And taking the coordinates of each load point as a circle center to make circles with radius, wherein the intersection area of all the circles is the optional position of the distribution transformer meeting the voltage drop requirement.
For example, from the calculation result of the preliminary distance and the acceptable radius of the load voltage, l i ＝115，l″ i ＝111，l 1 ＞l″ 1 Load P 1 The distance from the load center exceeds the allowable range of voltage drop, and the voltage drop margin of other loads is relatively large, so that P is satisfied 1 Is subjected to position correction by pressure drop requirement of L i For the radius, circles are made with each load point as the center of a circle, and new distribution positions are determined from the intersection areas of all circles.
The optional matching position is (160,110), as shown in fig. 4, where the distances between the coordinates of each load point and the matching position are respectively:
after correction, the distances between the coordinates of each load point and the distribution transformer position meet the voltage qualification requirement. Therefore, the configuration position correction method provided by the application not only depends on the load center as the basis of configuration position selection, but also can effectively avoid the condition that the voltage is lower than the lower limit after the configuration position is corrected by the load moment, so that all the configuration position meets the requirement of qualified voltage.
Further, in the step of correcting the distribution transformer position in the intersection region of the plurality of circles, the coordinate of the load center point in the intersection region may be preferentially set as the distribution transformer position.
In some embodiments of the present application, after the step of comparing the preliminary selected distance with the qualified radius of the load voltage, the method further includes:
s7: and if the initial selection distance is smaller than or equal to the qualified radius of the load voltage, taking the coordinates of the load center point as the distribution transformer position.
In the present embodiment, if l i ＜l″ i The initially selected position is considered to meet the requirement of qualified voltage, and the load center can be used as the position of the distribution transformer.
According to the technical scheme, the configuration position correction method provided by the application can be used for initially selecting the configuration position by utilizing the load center point, then obtaining the coordinate of the minimum point of the sum of the distances reaching each load point by using an iteration method, and finally calculating the voltage qualification range by calculating the load and power factors, the actual parameters of the configuration change circuit and the length so as to correct the configuration position.
Based on the load moment-based position correction method, as shown in fig. 5, the application further provides a load moment-based position correction device, which comprises:
fu Gequn obtaining module for obtaining coordinates of multiple load points and load power in load group;
the center point coordinate module is used for determining a load center point coordinate, wherein the load center point coordinate is a coordinate value calculated by a plurality of load point coordinates according to a gravity moment equation;
the initial selection distance determining module is used for determining initial selection distances from the coordinates of each load point to the coordinates of the load center point;
the accord with the qualified radius calculation module of the voltage, is used for using the load power of each load point, actual circuit parameter to calculate the qualified radius of the load voltage of each load point;
the comparison module is used for comparing the primary selection distance with the qualified radius of the load voltage;
and the position correction module is used for making circles according to the qualified radius of the load voltage by taking each load point as a circle center if the primary selection distance is larger than the qualified radius of the load voltage, and correcting the distribution transformer positions in the intersection areas of the made circles.
According to the technical scheme, the application provides a load moment-based position correction method and a load moment-based position correction device, wherein the method comprises the steps of firstly acquiring a plurality of load point coordinates and load power in a load group, and determining a load center point coordinate; determining the primary selection distance from each load point coordinate to the load center point coordinate and the qualified radius of the load voltage respectively, and comparing the primary selection distance with the qualified radius of the load voltage; and if the primary selection distance is larger than the qualified radius of the load voltage, making circles according to the qualified radius of the load voltage by taking each load point as a circle center, and correcting the distribution transformer position in an intersection area of the multiple made circles. The method corrects the allocation position through the load moment, and can effectively avoid the condition that the voltage exceeds the lower limit so as to meet the voltage qualification condition.
The above-provided detailed description is merely a few examples under the general inventive concept and does not limit the scope of the present application. Any other embodiments which are extended according to the solution of the application without inventive effort fall within the scope of protection of the application for a person skilled in the art.
Claims (6)
1. The load moment-based configuration position correction method is characterized by comprising the following steps of:
acquiring a plurality of load point coordinates and load power in a load group;
determining a load center point coordinate, wherein the load center point coordinate is a coordinate value calculated by a plurality of load point coordinates according to a gravity moment equation;
determining a preliminary distance from each load point coordinate to the load center point coordinate, wherein the preliminary distance is an absolute distance between the load point coordinate and the load center point coordinate, and calculating the preliminary distance according to the following formula;
wherein, (xi, yi) is the ith load point coordinate; (x, y) is the load center point coordinates;
calculating the qualified radius of the load voltage of each load point by using the load power of each load point and the actual line parameters;
the actual line parameters comprise a resistance per unit length, an inductance per unit length and an actual line length;
acquiring the actual line length;
calculating voltage drop by using the load power of each load point, the actual line length, the resistance per unit length and the inductance per unit length;
the maximum allowable range of the voltage drop is-10% of the outlet voltage of the distribution transformer; calculating the qualified radius of the load voltage of each load point according to the following steps:
wherein Pi is the load power of the i-th load point; u0 is the output voltage of the distribution transformer; r0 is the resistance of the unit length of the lead; x0 is the inductance per unit length of the wire; tan θ is the power factor tangent;
comparing the primary selection distance with the qualified radius of the load voltage;
and if the primary selection distance is larger than the qualified radius of the load voltage, making circles according to the qualified radius of the load voltage by taking each load point as a circle center, and correcting the distribution transformer position in an intersection area of the multiple made circles.
2. The method of positioning correction according to claim 1, further comprising, after the step of comparing the preliminary distance with the load voltage acceptable radius:
and if the initial selection distance is smaller than or equal to the qualified radius of the load voltage, taking the coordinates of the load center point as the distribution transformer position.
3. The positional displacement correction method according to claim 1, wherein in the step of determining the load center point coordinates, the load center point coordinates calculate coordinate values according to the following formula:
wherein P is i Load power for the ith load point; (x) i ，y i ) The i-th load point coordinate; (x, y) is the load center point coordinates.
4. The positional displacement correction method as claimed in claim 1, wherein the method calculates the pressure drop according to the following formula:
wherein P is i Load power for the i-th load point; l (L) i The distance from the ith load point to the load center point is the i-th load point; u (U) 0 Is the output voltage of the distribution transformer; r is R 0 The resistance is the resistance of the unit length of the wire; x is X 0 Inductance per unit length of wire; tan θ is the power factor tangent.
5. The method according to claim 1, wherein in the step of correcting the distribution transformer position in the intersection region of the plurality of circles, the coordinate of the load center point in the intersection region is preferentially set as the distribution transformer position.
6. A load moment-based displacement position correction device, comprising:
the load group acquisition module is used for acquiring a plurality of load point coordinates and load power in the load group;
the center point coordinate module is used for determining a load center point coordinate, wherein the load center point coordinate is a coordinate value calculated by a plurality of load point coordinates according to a gravity moment equation;
the initial selection distance determining module is used for determining initial selection distances from the coordinates of each load point to the coordinates of the load center point; calculating the primary selection distance according to the following formula;
wherein, (xi, yi) is the ith load point coordinate; (x, y) is the load center point coordinates;
the load voltage qualified radius calculation module is used for calculating the load voltage qualified radius of each load point by using the load power of each load point and the actual line parameters; the method comprises the steps of acquiring the actual line length, wherein the actual line parameters comprise a resistor with unit length, an inductor with unit length and the actual line length, and calculating the voltage drop by using the load power of each load point, wherein the maximum allowable range of the voltage drop is-10% of the distribution transformer outlet voltage; calculating the qualified radius of the load voltage of each load point according to the following steps:
wherein Pi is the load power of the i-th load point; u0 is the output voltage of the distribution transformer; r0 is the resistance of the unit length of the lead; x0 is the inductance per unit length of the wire; tan θ is the power factor tangent;
the comparison module is used for comparing the primary selection distance with the qualified radius of the load voltage;
and the position correction module is used for making circles according to the qualified radius of the load voltage by taking each load point as a circle center if the primary selection distance is larger than the qualified radius of the load voltage, and correcting the distribution transformer positions in the intersection areas of the made circles.
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