CN101106277A - A powerless optimization compensation method for 10KV distribution network unit line - Google Patents
A powerless optimization compensation method for 10KV distribution network unit line Download PDFInfo
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- CN101106277A CN101106277A CNA2007100621810A CN200710062181A CN101106277A CN 101106277 A CN101106277 A CN 101106277A CN A2007100621810 A CNA2007100621810 A CN A2007100621810A CN 200710062181 A CN200710062181 A CN 200710062181A CN 101106277 A CN101106277 A CN 101106277A
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Abstract
The invention relates to a reactive power optimization compensation approach of a 10KV distribution network unit line, belonging to the power transmission and distribution technology field. The approach is used to solve the reactive power optimization compensation problem of the high-voltage distribution network. The technical proposal is that: first, the flow of the active and reactive power of the unit line and the length and resistance of each section of line are monitored and measured; then, conductors of different models are converted into conductors of same length but different models, and an equivalent length line change curve of the converted reactive power is drawn; then, based on the compensation quantity same principle, the position and quantity of compensation point and compensation capacity are defined on the curve, the position of compensation point is reduced as the actual line position and each compensation point is configured with a compensation capacitor. By reasonably choosing the position and quantity of high-voltage compensation and determination the capacity configuration structure of capacitor, the invention is capable of not only enhancing the power factor, but also avoiding the frequent switching of capacitor, thus prolonging the service life of the compensation device and effectively decreasing the line damaging rate.
Description
Technical Field
The invention relates to an optimal configuration method for reactive power compensation of a power supply system, and belongs to the technical field of power transmission and distribution.
Background
In order to improve the power factor of the load of the power distribution network, save electric energy and reduce power supply cost, the power-free compensation is carried out on the 10KV power distribution network. Because the 10KV power distribution network has a large topological range and a complex structure, the adoption of reactive power centralized compensation has certain disadvantages. When multi-point compensation is adopted, if the position and the number of the compensation points and the compensation capacitor structure of each compensation point cannot be reasonably selected, a good compensation effect cannot be achieved.
The power factor of 10KV distribution network load has large fluctuation in one day, for the compensation point of reactive compensation by using a capacitor with fixed capacity, the power factor may reach the required standard during peak power utilization, and the overcompensation phenomenon may occur during valley power utilization, so that reactive reverse transmission is generated. Thus, the reactive power compensation device is required to be capable of automatically inputting and cutting off the capacitor and protecting the capacitor, namely, realizing automatic reactive power compensation. In a reactive automatic compensation device, how to determine the configuration of the capacitor determines the compensation efficiency of the device. Obviously, the more the number of capacitors is set, the larger the capacity adjusting range is, the smaller the adjustable distance is, and the better the compensation effect is. However, this inevitably results in a complicated structure of the compensation device and frequent switching of the capacitor, which shortens the service life of the switch and the capacitor. The scientific and reasonable capacitor configuration structure should be matched with the actual change of the load of the 10KV power distribution network, so that not only can the circuit keep a high power factor, the line loss rate be greatly reduced, the voltage quality be improved, but also the frequent switching of the capacitor can be avoided, the action times of the switch can be reduced, and the service lives of the switch and the capacitor can be effectively prolonged.
Therefore, a scientific and reasonable reactive compensation method is sought, the compensation position is scientifically selected, the capacitor configuration structure is reasonably determined, and the method has very important significance for saving electric energy and reducing cost.
Disclosure of Invention
The invention aims to provide a reactive power optimization compensation method for a unit line of a 10KV power distribution network, which can reasonably select the positions and the number of compensation capacitors and determine a capacitance configuration structure so as to achieve a better compensation effect.
The problem is realized by the following technical scheme:
the reactive power optimizing compensation method for 1.0KV power distribution network unit line includes the steps of monitoring and measuring the flow direction of active and reactive power of the unit line, the length and resistance of each section of line, converting the wires of different types into wires of the same type and different lengths, drawing the curve of reactive power changing with the equivalent length of the converted line, determining the positions, number and compensation capacity of compensation points on the curve according to the principle that compensation amount is the same, reducing the positions of the compensation points to actual line positions, and configuring the compensation capacitors of the compensation points according to the distribution of the reactive power in each time period and the statistical principle, and includes the following steps:
a. monitoring the flow direction of active power and reactive power of the unit lines by using 10KV line working condition monitoring equipment, and measuring the length and resistance of each section of line;
b. converting the wires of different models into the wires of the same model and different lengths to obtain the equivalent length of the circuit:
assuming that the actual line has K sections, randomly selecting the resistance R of the J (J is more than 0 and less than or equal to K) th section j The resistance is a standard resistance, and the actual length of the ith segment of the circuit can be converted into an equivalent length:
in the formula:
L i ': the equivalent length of the ith section of line;
L i : the actual length of the ith section of line;
R i : resistance of the ith segment;
integrated value of equivalent length after conversion of each segment:
drawing a curve of reactive power changing along with the equivalent length of the line;
c. determining the number, the positions and the compensation capacity of the compensation points:
randomly selecting a point, setting the point as a point HA for installing A groups of capacitors, according to a two-thirds rule (under the condition that reactive loads are uniformly distributed along the line, if only one capacitor is installed, the distance between a compensation point and the line starting point is 2/3 of the line length, the capacitance capacity is 2/3 of the total reactive load of the line, at the moment, the line loss is reduced to the maximum, namely, the compensation effect is the best);
d. restoring the position of the compensation point to an actual line position, wherein the capacity of the capacitor is unchanged;
e. and configuring the compensation capacitors of the compensation points according to the distribution of the reactive power in each time period.
The invention utilizes the curve of the reactive power changing along with the equivalent length of the line and determines the number and the positions of the compensation points according to the principle of the same compensation amount, thereby greatly simplifying the calculation process. The distribution of the reactive power in each time period is determined by monitoring the load change of the compensation points, and a good balance point is found between the complexity of the equipment and the compensation effect according to the statistical principle, so that the problem of the capacitor capacity configuration structure is solved well. The invention scientifically selects the position and the quantity of high-voltage compensation and reasonably determines the capacitor capacity configuration structure, thereby not only keeping a circuit with higher power factor and improving the voltage quality, but also avoiding frequent switching of the capacitor and effectively prolonging the service life of a switch and the capacitor.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 and fig. 2 are schematic diagrams of a radiation line and a looped network line respectively;
FIG. 3 is a reduced reactive power distribution plot;
FIG. 4 and FIG. 5 are schematic diagrams of capacitor selection of group A and group B, respectively;
FIG. 6 is a schematic diagram of a compensation scheme verification method.
The symbols in the figure are: XTE, a line working condition monitor, XTU, a low-voltage reactive power compensation device, GTU, a high-voltage reactive power compensation device, T and a distribution transformer.
The meaning of the symbols used herein:
L i ': equivalent length of i-th section of line, L j : the actual length of the J-th section of line; l': equivalent total length of line, L i ": the converted length R of the ith section when the total equivalent length of the circuit is 1 j : resistance of the J-th section, R i : resistance of the i-th segment.
Detailed Description
Fig. 1 is a schematic diagram of a radiating line, and all radiating single lines in a 10KV distribution network can be regarded as independent unit lines. Fig. 2 is a schematic diagram of a ring network line, which can be separated into relatively independent unit lines through topology analysis. The method comprises the steps that load and reactive change conditions of all distribution transformers and lines on a unit line are monitored in real time through terminal equipment (comprising a high-voltage reactive power compensation device, a low-voltage distribution monitoring and reactive power compensation device, a distribution monitoring device and a line working condition monitor), monitoring data are sent to a background (software) management system through remote communication (in a wireless or wired mode), the background management system provides a capacitance optimization configuration scheme of the unit line through comprehensive analysis and calculation of the monitoring data, and the position, the number and the capacity configuration structure of compensation points are determined.
The implementation method is specifically described as follows:
1. by utilizing data monitored by XTE of 10KV line working condition monitoring equipment, accurate active power and reactive power flow directions on a 10KV line can be obtained, and the length and the resistance of each section of line are measured;
2. obtaining the equivalent length of the whole line according to the resistance of each section of line, wherein the method comprises the following steps:
assuming that the actual line has K sections, randomly selecting the resistance R of the J (J is more than 0 and less than or equal to K) th section j The resistance is a standard resistance, and the actual length of the ith segment of the circuit can be converted into an equivalent length:
in the formula:
L i ': the equivalent length of the ith section of line;
L i : the actual length of the ith section of line;
R i : resistance of the ith segment;
integrated value of equivalent length after conversion of each segment:
according to the conversion, the wires of different models can be converted into the wires of the same model and different lengths for processing, so that the calculation is simplified;
the total length L' may also be reduced to 1, resulting in a reduced length for each segment:
3. drawing a curve of reactive power changing along with the equivalent length of the line;
4. determining the number, the positions and the compensation capacity of compensation points:
firstly, randomly selecting a point from the tail end of a line, setting the point as an HA point for installing A groups of capacitors, installing the capacitors at the point according to a two-thirds rule, wherein the capacity of the capacitors at the point is 2 times of the reactive load of the point, then determining the position of the next compensation point and the capacity of the capacitors according to the principle that the compensation amount is the same, and repeating the steps until the position of the last compensation point and the capacity of the capacitors are determined, finally checking the position of the last compensation point according to the principle that the compensation amount is the same, if the compensation amount is not the same, re-determining the positions of other compensation points after adjusting the HA point until the position of the last compensation point accords with the principle that the compensation amount is the same. For the method, the compensation points have a correlation relationship, after the first compensation point is determined, the positions of other compensation points are also determined, and the relationship between two adjacent points conforms to the principle of equal area, namely the compensation quantity of a line before the point A is in a point A is the same as the reactive compensation quantity after the point B is in a point B.
According to actual conditions on site, collected data at the same moment can be used as basic data, a program automatically and randomly selects a starting point and starts to calculate by combining relevant parameters such as resistance, line length and the like, and whether the calculation result is reasonable or not is judged according to the area equality principle. And judging whether the first selection point is proper or not according to the last mounting point, the capacitance value of the capacitor and the compensation effect. If not, the fine tuning is continued and the calculation is performed again until it is appropriate.
5. Restoring the position of the compensation point to an actual line position, wherein the capacity of the capacitor is unchanged;
the following is an example of determining the number, location and compensation capacity of compensation points and how the check is performed:
it is assumed that the reactive load on a line is calculated as shown in fig. 3. The method for calculating the optimal reactive compensation scheme of the line comprises the following steps:
in fig. 3, the conversion has been performed and the total reactive load is set to 1 and the total line length to 1. One point is randomly selected and set as the HA point where the a group capacitors are mounted. Therefore, after the capacitor is installed at the HA point, the reactive influence on the line is shown in fig. 4, and the effect is shown that the reactive load on all lines is reduced to reduce the reactive power with the same capacitance value of the capacitor (the reactive power for capacitor compensation, which can be regarded as the capacitor capacity for simplification.)
Since the capacitor mounted at the point a needs to compensate for the reactive power after the point a and also needs to compensate for the reactive power before the point a, the capacity of the capacitor mounted at the point needs to be 2 times the reactive load at the point, and the value is expressed by ICA. This also follows the two-thirds rule.
In fig. 4, a line drawn with a dotted line HA connects I and II, which is the ICA, and represents the overall line reactive drop ICA.
According to the principle that the compensation quantity is the same, the compensation position of the point B can be determined. As shown in fig. 5.
Similarly, the C point compensation position can be determined. The completed pattern is shown in figure 6.
The detection method comprises the following steps:
in FIG. 6, it is judged whether or not the area C is equal to the area C1'. If equal, the actual line position can be restored from the positions of these compensation points, with the capacitance of the capacitor unchanged.
If the area of C1 is smaller than that of C1', the point A needs to be slightly fine-tuned towards the end of the line, and the calculation is carried out again. And vice versa until the two areas are equal.
In the actual installation process, the power distribution unit can be installed at the nearest power distribution point.
The above design uses the reactive load value calculation at a certain time, and the reactive load at each time is different. Based on these different data, the detailed capacitor grouping configuration of the compensation points can be determined, and the automatic optimization compensation is completed.
Claims (1)
1. A10 KV distribution network unit line reactive power optimization compensation method is characterized in that the method comprises the steps of monitoring and measuring the flow direction of active power and reactive power of a unit line, the length and the resistance of each section of line, converting wires of different types into wires of the same type and different lengths, drawing a curve of reactive power changing along with the equivalent length of the converted line, determining the position, the number and the compensation capacity of compensation points on the curve according to the principle that compensation quantity is the same, reducing the positions of the compensation points into actual line positions, and configuring compensation capacitors of the compensation points according to the distribution of the reactive power in each time period, wherein the method comprises the following specific steps:
a. monitoring the flow direction of active power and reactive power of the unit lines by using 10KV line working condition monitoring equipment, and measuring the length and resistance of each section of line;
b. converting the wires of different models into the wires of the same model and different lengths to obtain the equivalent length of the circuit:
assuming that the actual line has K segments, the resistance R of the J segment is randomly selected j For the standard resistance, the actual length of the ith line segment can be converted into an equivalent length:
in the formula:
L i ': the equivalent length of the ith section of line; l is a radical of an alcohol i : the actual length of the ith section of line; r i : resistance of the ith segment; of sectionsThe integrated value of equivalent length after conversion:
drawing a curve of reactive power changing along with the equivalent length of the line;
c. determining the number, the positions and the compensation capacity of the compensation points:
randomly selecting a point, setting the point as a point HA for installing A groups of capacitors, according to a two-thirds rule, if only one capacitor is installed, the distance between a compensation point and a line starting point is 2/3 of the line length, the capacitance capacity is 2/3 of the total reactive load of the line, if two groups of capacitors are installed, the capacitance capacity of the capacitor is 2/5 of the total reactive load, the first group of capacitors are installed at the distance of 2/5 of the line starting end, the second group of capacitors are installed at the distance of 4/5 of the starting end, the capacitance of the capacitor installed at the point is 2 times of the reactive load of the point, then according to the same compensation amount principle, determining the position of the next compensation point and the capacitance of the capacitor, and so on until the position of the last compensation point and the capacitance of the capacitor are determined, finally, according to the same compensation amount principle, if the position of the last compensation point is not matched, adjusting the HA point, re-determining the positions of other compensation points until the position of the last compensation point is matched with the same compensation amount principle, and determining the number of the compensation points;
d. restoring the position of the compensation point to an actual line position, wherein the capacity of the capacitor is unchanged;
e. and configuring the compensation capacitors of the compensation points according to the distribution of the reactive power in each time period.
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| CNB2007100621810A CN100536275C (en) | 2007-06-19 | 2007-06-19 | A powerless optimization compensation method for 10KV distribution network unit line |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101635463A (en) * | 2009-06-23 | 2010-01-27 | 上海申瑞电力科技股份有限公司 | Reactive configuration method for capacity of capacitor bank in substation |
| CN102033999A (en) * | 2010-12-10 | 2011-04-27 | 天津天大求实电力新技术股份有限公司 | Load distribution based method for calculating recently planned annual line loss of medium-voltage distribution network |
| CN103094913A (en) * | 2013-01-12 | 2013-05-08 | 华南理工大学 | Optimal configuration of 10 kV power distribution network parallel reactor and compensation method of 10 kV power distribution network parallel reactor |
| CN104092221A (en) * | 2014-06-19 | 2014-10-08 | 航天科工深圳（集团）有限公司 | Optimized and optimally-cutting reactive compensation method and reactive compensation device |
| CN107181265A (en) * | 2017-07-11 | 2017-09-19 | 刘儒水 | Distribution line one-point or multi-point reactive-load compensation method and device |
| CN107392673A (en) * | 2017-08-08 | 2017-11-24 | 中国农业大学 | A kind of computational methods of the transmission of electricity wheeling rates of increment power distribution network |
| CN115207939A (en) * | 2022-09-13 | 2022-10-18 | 广东电网有限责任公司湛江供电局 | Power compensation method and device for line |
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2007
- 2007-06-19 CN CNB2007100621810A patent/CN100536275C/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101635463A (en) * | 2009-06-23 | 2010-01-27 | 上海申瑞电力科技股份有限公司 | Reactive configuration method for capacity of capacitor bank in substation |
| CN101635463B (en) * | 2009-06-23 | 2013-07-10 | 上海申瑞继保电气有限公司 | Reactive configuration method for capacity of capacitor bank in substation |
| CN102033999A (en) * | 2010-12-10 | 2011-04-27 | 天津天大求实电力新技术股份有限公司 | Load distribution based method for calculating recently planned annual line loss of medium-voltage distribution network |
| CN102033999B (en) * | 2010-12-10 | 2012-10-17 | 天津天大求实电力新技术股份有限公司 | Load distribution based method for calculating recently planned annual line loss of medium-voltage distribution network |
| CN103094913A (en) * | 2013-01-12 | 2013-05-08 | 华南理工大学 | Optimal configuration of 10 kV power distribution network parallel reactor and compensation method of 10 kV power distribution network parallel reactor |
| CN103094913B (en) * | 2013-01-12 | 2015-03-11 | 华南理工大学 | Optimal configuration of 10 kV power distribution network parallel reactor and compensation method of 10 kV power distribution network parallel reactor |
| CN104092221A (en) * | 2014-06-19 | 2014-10-08 | 航天科工深圳（集团）有限公司 | Optimized and optimally-cutting reactive compensation method and reactive compensation device |
| CN107181265A (en) * | 2017-07-11 | 2017-09-19 | 刘儒水 | Distribution line one-point or multi-point reactive-load compensation method and device |
| CN107181265B (en) * | 2017-07-11 | 2019-06-18 | 刘儒水 | Distribution line one-point or multi-point reactive-load compensation method and device |
| CN107392673A (en) * | 2017-08-08 | 2017-11-24 | 中国农业大学 | A kind of computational methods of the transmission of electricity wheeling rates of increment power distribution network |
| CN115207939A (en) * | 2022-09-13 | 2022-10-18 | 广东电网有限责任公司湛江供电局 | Power compensation method and device for line |
| CN115207939B (en) * | 2022-09-13 | 2023-01-13 | 广东电网有限责任公司湛江供电局 | Power compensation method and device for line |
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