CN110765564A - Distribution transformer position correction method and device based on load moment - Google Patents
Distribution transformer position correction method and device based on load moment Download PDFInfo
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Abstract
The application provides a distribution transformer position correction method and device based on load moment, wherein the method comprises the steps of firstly obtaining coordinates of a plurality of load points and load power in a load group, and determining coordinates of a load center point; respectively determining the primary selection distance from each load point coordinate to the load central point coordinate and the qualified radius of the load voltage, and comparing the primary selection distance with the qualified radius of the load voltage; and if the initial selection distance is larger than the qualified radius of the load voltage, taking each load point as a circle center, making a circle according to the qualified radius of the load voltage, and correcting the distribution transformation position in the intersection region of the plurality of made circles. According to the method, the distribution transformer position is corrected through the load moment, so that the situation that the voltage is lower than the lower limit can be effectively avoided, and the qualified condition of the voltage is met.
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 transformer position correction method and device based on load moment.
Background
Distribution transformers, distribution transformers for short, are static electrical appliances that transform alternating voltage and current according to the law of electromagnetic induction in a distribution system to transmit alternating current energy. The installation position of the distribution transformer is the distribution position. In the planning and construction process of an electric power system, the selection of the distribution transformer position is an important link, and the reasonability of the position selection can directly influence the line investment cost, the system operation economy, the electric energy quality and the like. The primary principle of the distribution and transformation position selection is to approach the load center, and then further to perform optimization selection by using the minimum investment as a basic principle.
Therefore, the traditional method for planning and constructing the power distribution network comprises the steps of firstly calculating the position of a load center by adopting a load moment method according to the position of the load point, and selecting the site of a distribution transformer on the position of the load center; and then, establishing power transmission facilities for the peripheral area based on the load center position.
However, in actual engineering, the situation of conditional straight-line erection of distribution lines rarely occurs, and there is a large deviation between an actual line and a theoretical distance, so that there is a large error between a calculated theoretical voltage drop and an actual voltage change, which causes a situation that a load center is insufficient as an address selection position of a distribution transformer, and the voltage drop of some load points in actual application may exceed an allowable range. Therefore, the distribution positions initially selected by the load center do not always satisfy the voltage qualification conditions, and the distribution positions need to be further corrected.
Disclosure of Invention
The application provides a distribution transformer position correction method and device based on load moment, and aims to solve the problem that a traditional distribution transformer position selection method does not meet voltage qualified conditions.
In one aspect, the present application provides a distribution transformer position correction method based on a load moment, including:
acquiring coordinates and load power of a plurality of load points in a load group;
determining the coordinate of the load center point, wherein the coordinate of the coincidence center point is a coordinate value calculated by the coordinates of the plurality of load points according to the 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 and the actual line parameter of each load point;
comparing the primary selection distance with the qualified radius of the load voltage;
and if the initial selection distance is larger than the qualified radius of the load voltage, taking each load point as a circle center, making a circle according to the qualified radius of the load voltage, and correcting the distribution transformation position in the intersection region of the plurality of made circles.
Optionally, after the step of comparing the initially selected distance with the qualified radius of the load voltage, the method further includes:
and if the initially selected distance is smaller than or equal to the qualified radius of the load voltage, taking the coordinate of the load center point as a distribution transformation position.
Optionally, in the step of determining the coordinate of the load center point, the coordinate of the load center point is calculated according to the following formula:
in the formula, PiLoad power for the ith load point; (x)i，yi) Is the ith load point coordinate; (x, y) are load center point coordinates.
Optionally, the initial distance is an absolute distance between the load point coordinate and the load center point coordinate; in the step of determining the initial selection distance from each load point coordinate to the load center point coordinate, calculating the initial selection distance according to the following formula;
in the formula (x)i，yi) Is the ith load point coordinate; (x, y) are 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 following steps:
acquiring the actual line length;
the load power, the actual line length, the resistance per unit length and the inductance per unit length at each load point are used to calculate the voltage drop.
Optionally, the method calculates the pressure drop according to the following formula:
in the formula, PiIs the ith load pointThe load power of (d); liThe distance from the ith load point to the load center point; u shape0Is the distribution transformer outlet voltage; r0Is a wire unit length resistor; x0Is a lead unit length inductor; tan θ is a power factor tangent value.
Optionally, the maximum allowable range of the voltage drop is-10% of the voltage at the distribution outlet; the method comprises the following steps of calculating the qualified radius of the load voltage of each load point according to the following formula:
in the formula, PiThe load power of the ith load point; u shape0Is the distribution transformer outlet voltage; r0Is a wire unit length resistor; x0Is a lead unit length inductor; tan θ is a power factor tangent value.
Optionally, in the step of correcting the distribution position in the intersection region of the plurality of circles, the coordinate of the load center point in the intersection region is preferentially used as the distribution position.
On the other hand, the application also provides a distribution transformer position correction device based on load moment, which comprises:
the device comprises a coincidence group acquisition module, a load group acquisition module and a load power acquisition module, wherein the coincidence group acquisition module is used for acquiring a plurality of load point coordinates and load power in a load group;
the center point coordinate module is used for determining the coordinates of the load center points, and the coordinates of the coincidence center points are coordinate values calculated by the coordinates of the plurality of load point according to the gravity moment equation;
the initial selection distance determining module is used for determining the initial selection distance from each load point coordinate to the load center point coordinate;
the qualified radius of the load voltage calculation module is used for calculating the qualified radius of the load voltage of each load point by using the load power and the actual line parameter 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 a circle according to the qualified radius of the load voltage by taking each load point as a circle center and correcting the distribution position in an intersection region of the plurality of made circles if the primary selection distance is greater than the qualified radius of the load voltage.
According to the technical scheme, the distribution transformer position correction method and device based on the load moment are provided, the method comprises the steps of firstly obtaining coordinates of a plurality of load points and load power in a load group, and determining coordinates of a load center point; respectively determining the primary selection distance from each load point coordinate to the load central point coordinate and the qualified radius of the load voltage, and comparing the primary selection distance with the qualified radius of the load voltage; and if the initial selection distance is larger than the qualified radius of the load voltage, taking each load point as a circle center, making a circle according to the qualified radius of the load voltage, and correcting the distribution transformation position in the intersection region of the plurality of made circles. According to the method, the distribution transformer position is corrected through the load moment, so that the situation that the voltage is lower than the lower limit can be effectively avoided, and the qualified condition of the voltage is met.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a distribution transformer position correction method based on load moment according to the present application;
FIG. 2 is a schematic view of the center of load point of the present application;
FIG. 3 is a schematic flow chart of the present application for determining pressure drop;
FIG. 4 is a schematic diagram of a modified distribution position of the present application;
fig. 5 is a schematic structural diagram of a distribution transformation position correction device based on load moment according to the present application.
Detailed Description
Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples do not represent all embodiments consistent with the present application. But merely as exemplifications of systems and methods consistent with certain aspects of the application, as recited in the claims.
Referring to fig. 1, a schematic flow chart of a distribution transform position correction method based on load moment according to the present application is shown. As can be seen from fig. 1, the method for correcting a distribution transformation position provided by the present application includes the following steps:
s1: and acquiring the coordinates of a plurality of load points and the load power in the load group.
In the technical scheme provided by the application, the load group refers to a set consisting of a plurality of loads in the range of the power distribution network to be planned, and each load can represent electric equipment in an actual application environment. In the load group, each load corresponds to a position, i.e. has load point coordinates. The load power is a calculated power of each load in the load point, and may correspond to a maximum power of the electric device.
The load group consists of n loads, and the calculation power of each load is P1、P2、P3、……、PnThe coordinates of each load point are: p1(x1,y1)、P2(x2,y2)、P3(x3,y3)……Pn(xn,yn)。
The load point coordinates can be the longitude and latitude of the corresponding address of each load point, or a rectangular coordinate system is constructed in the range of the power distribution network to be planned, and the load point coordinates consist of coordinate values corresponding to the established coordinate system.
For example: in practical application, a plurality of load points P in the same coordinate system1、P2、P3、P4、P5、P6The load point coordinates and the coincidence power are respectively as follows:
P150kW, load point coordinate is (70,170);
P235kW, load point coordinate (110,100);
P313kW, load point coordinate (36, 80);
P418kW, load point coordinateIs (165, 60);
P545kW, load point coordinates (260, 80);
P6load point coordinates are (250,160) 43 kW.
S2: and determining the coordinates of the load center point.
After the coordinates of the plurality of load points in the coincidence group are obtained, the center of gravity can be calculated according to the coordinates of the plurality of load points and the corresponding calculation power, and the coordinates of the coincidence center point are determined. Namely, the coordinate of the coincidence center point is a coordinate value calculated by the coordinate of the plurality of load points according to the gravity moment equation.
The barycentric moment equation is as follows:
(∑Pi)x＝∑(Pixi)；
(∑Pi)y＝∑(Piyi)；
the gravity moment equation is converted, and the calculation formula of the center point coordinate is as follows:
in the formula, PiLoad power for the ith load point; (x)i，yi) Is the ith load point coordinate; (x, y) are load center point coordinates.
Taking the coordinates of the coincident points in the above example as an example, as shown in fig. 2, the coordinates of the load center are:
the load center point coordinate is obtained by calculation (163,103), and the load center point coordinate can be used as an initial distribution transformer position, namely the installation position of the initial distribution transformer.
S3: and determining the initial selection distance from each load point coordinate to the load center point coordinate.
In this application, the initial selection distance is an absolute distance between each load point and the load center point, and the specific calculation mode may be:
in the formula (x)i，yi) Is the ith load point coordinate; (x, y) are load center point coordinates.
For example, P is calculated separately1、P2、P3、P4、P5、P6The 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 and the actual line parameters of each load point.
When the initial selection distance is obtained through calculation, the load voltage qualified radius of each load point can be calculated according to the load power and the actual line parameter of each load point, so that the initial selection distance and the load voltage qualified radius can be compared subsequently, and whether the initial selection distribution transformer position needs to be corrected or not is determined.
The influence of the actual line on the power supply state is comprehensively considered in the application, and the transmission effect is influenced because the resistance and the inductance in the line generate voltage drop on the transmitted voltage, so that the actual line parameters comprise the resistance and the inductance in unit length and the length of the actual line.
In some embodiments of the present application, in order to determine the load voltage qualified radius, the voltage drop during power supply at each load point may be calculated to ensure that each load point can supply a suitable power supply voltage. Thus, as shown in fig. 3, the method further comprises:
s41: acquiring the actual line length;
s42: the load power, the actual line length, the resistance per unit length and the inductance per unit length at each load point are used to calculate the voltage drop.
In practical application, the required line length 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, if the actual line is arranged in an L shape, the lengths of both sides of the L-shaped wiring line need to be accumulated to obtain the actual line length.
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 for determining the qualified radius of the load voltage of each load point. I.e. the furthest distance between the load point and the load centre point at which the pressure drop is at its maximum.
The method may calculate the pressure drop according to the following equation:
in the formula, PiThe load power of the ith load point; liFor the ith load point to separate from the loadDistance of the center point; u shape0Is the distribution transformer outlet voltage; r0Is a wire unit length resistor; x0Is a lead unit length inductor; tan θ is a power factor tangent value.
Since the allowable deviation of the 220V single-phase power supply voltage is + 7% to-10% of the rated voltage, that is, the lowest allowable voltage of the 220V single-phase power supply voltage at the load end is 220-:
converting the above formula to obtain a calculation formula of the qualified radius of the load voltage, namely, the maximum allowable range of the voltage drop is-10% of the voltage of the distribution transformer outlet; the method comprises the following steps of calculating the qualified radius of the load voltage of each load point according to the following formula:
in the formula, PiThe load power of the ith load point; u shape0Is the distribution transformer outlet voltage; r0Is a wire unit length resistor; x0Is a lead unit length inductor; tan θ is a power factor tangent value.
For example, the load power factor tangent tan θ is 0.49, and the resistance per unit length of the wire R00.25, lead unit length inductance X0When the load voltage qualified radius is 0.3, the load voltage qualified radius corresponding to each load point is calculated by the following formula:
s5: and comparing the primary selection distance with the qualified radius of the load voltage.
The initial selection distance l is obtained through calculationiAnd load voltage passing radius liAnd 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 the maximum allowable voltage drop.
S6: and if the initial selection distance is larger than the qualified radius of the load voltage, taking each load point as a circle center, making a circle according to the qualified radius of the load voltage, and correcting the distribution transformation position in the intersection region of the plurality of made circles.
In practical application, if li”＜liConsidering that the initially selected position can not meet the qualified voltage requirement, taking liThe radius is adopted, the coordinate of each load point is taken as the center of a circle, and the intersection area of all circles is the optional position of the distribution transformer meeting the voltage drop requirement.
For example, from the calculation results of the above-mentioned preliminary selected distance and the load voltage acceptable radius, li＝115，li”＝111，l1＞l1"load P1The distance from the load center exceeds the allowable pressure drop range, and the pressure drop margin of other loads is relatively large and is required to satisfy P1The pressure drop of (1) requires correction of the distribution transformation position, and l is takeniAnd taking the radius as the radius, making a circle by taking each load point as the center of the circle, and determining a new distribution position from the intersection area of all circles.
The optional configuration position is (160,110), and as shown in fig. 4, the distance between each load point coordinate and the configuration position is:
after correction, the distance between each load point coordinate and the distribution transformation position meets the voltage qualification requirement. Therefore, the distribution transformer position correction method provided by the application not only depends on the load center as a basis for selecting the distribution transformer position, but also can effectively avoid the situation that the voltage is lower than the lower limit after the distribution transformer position is corrected through the load moment, so that all the distribution transformer positions meet the requirement of qualified voltage.
Further, in the step of correcting the distribution position in the intersection region of the plurality of circles, the coordinate of the load center point in the intersection region may be preferentially used as the distribution position.
In some embodiments of the present application, after the step of comparing the initially selected distance with the qualified radius of the load voltage, the method further includes:
s7: and if the initially selected distance is smaller than or equal to the qualified radius of the load voltage, taking the coordinate of the load center point as a distribution transformation position.
In this embodiment, if li＜li", consider the primary position to satisfy the voltageThe load center can be used as the position of distribution transformation according to the requirements of grids.
According to the technical scheme, the distribution transformer position correction method can be used for initially selecting the distribution transformer position by utilizing the load center point, then obtaining the coordinate of the minimum point of the sum of the distances of all the load points by using an iteration method, and finally calculating the voltage qualified range by calculating the load and power factors and the actual parameters and the length of the distribution transformer circuit so as to correct the distribution transformer position.
Based on the above method for correcting the distribution transformation position based on the load moment, as shown in fig. 5, the present application further provides a device for correcting the distribution transformation position based on the load moment, which includes:
the device comprises a coincidence group acquisition module, a load group acquisition module and a load power acquisition module, wherein the coincidence group acquisition module is used for acquiring a plurality of load point coordinates and load power in a load group;
the center point coordinate module is used for determining the coordinates of the load center points, and the coordinates of the coincidence center points are coordinate values calculated by the coordinates of the plurality of load point according to the gravity moment equation;
the initial selection distance determining module is used for determining the initial selection distance from each load point coordinate to the load center point coordinate;
the qualified radius of the load voltage calculation module is used for calculating the qualified radius of the load voltage of each load point by using the load power and the actual line parameter 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 a circle according to the qualified radius of the load voltage by taking each load point as a circle center and correcting the distribution position in an intersection region of the plurality of made circles if the primary selection distance is greater than the qualified radius of the load voltage.
According to the technical scheme, the distribution transformer position correction method and device based on the load moment are provided, the method comprises the steps of firstly obtaining coordinates of a plurality of load points and load power in a load group, and determining coordinates of a load center point; respectively determining the primary selection distance from each load point coordinate to the load central point coordinate and the qualified radius of the load voltage, and comparing the primary selection distance with the qualified radius of the load voltage; and if the initial selection distance is larger than the qualified radius of the load voltage, taking each load point as a circle center, making a circle according to the qualified radius of the load voltage, and correcting the distribution transformation position in the intersection region of the plurality of made circles. According to the method, the distribution transformer position is corrected through the load moment, so that the situation that the voltage is lower than the lower limit can be effectively avoided, and the qualified condition of the voltage is met.
The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.
Claims (10)
1. A distribution transformer position correction method based on load moment is characterized by comprising the following steps:
acquiring coordinates and load power of a plurality of load points in a load group;
determining the coordinate of the load center point, wherein the coordinate of the coincidence center point is a coordinate value calculated by the coordinates of the plurality of load points according to the 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 and the actual line parameter of each load point;
comparing the primary selection distance with the qualified radius of the load voltage;
and if the initial selection distance is larger than the qualified radius of the load voltage, taking each load point as a circle center, making a circle according to the qualified radius of the load voltage, and correcting the distribution transformation position in the intersection region of the plurality of made circles.
2. The distribution transformer position correction method according to claim 1, wherein after the step of comparing the preliminary selection distance with the load voltage qualified radius, the method further comprises:
and if the initially selected distance is smaller than or equal to the qualified radius of the load voltage, taking the coordinate of the load center point as a distribution transformation position.
3. The distribution transformer position 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:
in the formula, PiLoad power for the ith load point; (x)i，yi) Is the ith load point coordinate; (x, y) are load center point coordinates.
4. The distribution transformer position correction method according to claim 1, characterized in that the primary selection distance is an absolute distance between the load point coordinates and the load center point coordinates; in the step of determining the initial selection distance from each load point coordinate to the load center point coordinate, calculating the initial selection distance according to the following formula;
in the formula (x)i，yi) Is the ith load point coordinate; (x, y) are load center point coordinates.
5. The distribution transformation position correction method according to claim 1, wherein the actual line parameters in the step of calculating the load voltage passing radius of each load point using the load power of each load point and the actual line parameters include a resistance per unit length and an inductance per unit length.
6. The distribution transform position correction method according to claim 5, wherein the actual line parameters further include an actual line length; the method further comprises the following steps:
acquiring the actual line length;
the load power, the actual line length, the resistance per unit length and the inductance per unit length at each load point are used to calculate the voltage drop.
7. The distribution transform position correction method according to claim 6, wherein the method calculates the pressure drop according to the following formula:
in the formula, PiThe load power of the ith load point; liThe distance from the ith load point to the load center point; u shape0Is the distribution transformer outlet voltage; r0Is a wire unit length resistor; x0Is a lead unit length inductor; tan θ is a power factor tangent value.
8. The distribution transformer position correction method according to claim 7, characterized in that the maximum allowable range of the voltage drop is-10% of the distribution transformer outlet voltage; the method comprises the following steps of calculating the qualified radius of the load voltage of each load point according to the following formula:
in the formula, PiThe load power of the ith load point; u shape0Is the distribution transformer outlet voltage; r0Is a wire unit length resistor; x0Is a lead unit length inductor; tan θ is a power factor tangent value.
9. The distribution transformation position correction method according to claim 1, wherein in the step of correcting the distribution transformation position within an intersection area of the plurality of circles made, coordinates from the load center point in the intersection area are preferentially taken as the distribution transformation position.
10. A distribution transformer position correction device based on load moment is characterized by comprising:
the device comprises a coincidence group acquisition module, a load group acquisition module and a load power acquisition module, wherein the coincidence group acquisition module is used for acquiring a plurality of load point coordinates and load power in a load group;
the center point coordinate module is used for determining the coordinates of the load center points, and the coordinates of the coincidence center points are coordinate values calculated by the coordinates of the plurality of load point according to the gravity moment equation;
the initial selection distance determining module is used for determining the initial selection distance from each load point coordinate to the load center point coordinate;
the qualified radius of the load voltage calculation module is used for calculating the qualified radius of the load voltage of each load point by using the load power and the actual line parameter 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 a circle according to the qualified radius of the load voltage by taking each load point as a circle center and correcting the distribution position in an intersection region of the plurality of made circles if the primary selection distance is greater than the qualified radius of the load voltage.
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| 冯超 等: "基于负荷矩理论的配电线路规划与变压器选址优化", vol. 34, no. 2, pages 5 - 8 * |
| 苏健祥 等: "配电变压器安装位置对低压线损的影响", vol. 31, no. 34, pages 44 - 46 * |
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| CN110765564B (en) | 2023-11-17 |
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