CN110991053A - Multi-parameter collaborative optimization method of overhead ground wire energy taking system - Google Patents
Multi-parameter collaborative optimization method of overhead ground wire energy taking system Download PDFInfo
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Abstract
The invention discloses a multi-parameter collaborative optimization method of an overhead ground wire energy taking system, which comprises the steps of listing all energy taking schemes according to a wiring mode of a ground wire of an overhead transmission line, establishing a power analysis model of each energy taking scheme, analyzing the influence of key parameters such as the length of the energy taking ground wire, the grounding resistance of a tower, the load impedance and the like on the energy taking power of the ground wire energy taking and taking system, drawing an influence rule curve, and finally determining each key parameter of the energy taking system through comprehensive coordination according to the curve of each parameter. The method provided by the invention is visual, clear, simple and practical based on graphic analysis, can provide a theoretical analysis method for the design of a ground wire energy taking system, realizes the multi-parameter collaborative optimization of the energy taking system, and has an important role in improving the energy taking power of the energy taking system and meeting the load power supply requirement.
Description
Technical Field
The invention relates to the field of electrical engineering, in particular to a multi-parameter collaborative optimization method of an overhead ground wire energy taking system.
Background
Along with the increasingly serious dependence of society on electric energy, the requirement for safe and stable operation reliability of a power grid is higher and higher, and a large number of online monitoring devices are put into operation on a power transmission line. Due to the lack of a continuous and stable low-voltage power supply, the on-line monitoring device for the power transmission line generally adopts a solar battery, a small wind driven generator and other modes for power supply, the power supply stability is greatly influenced by weather, the output power is small, the size of the device is large, and the economical efficiency is poor. The power supply with sufficient power and continuous stability becomes a bottleneck limiting the development of the online monitoring device of the power transmission line. According to the electromagnetic induction principle, induced voltage exists on the overhead ground wire, a current loop can be formed between the two ground wires and between the ground wire and the ground, the overhead ground wire energy taking technology can provide continuous and stable electric energy, and the method is the most potential means for solving the power supply problem of the power transmission line on-line monitoring device. However, at present, the ground wire energy taking technology is a key problem that how to obtain enough power from the ground wire and meet the power requirement of an online monitoring device is not solved.
Disclosure of Invention
In order to solve the problems, the invention provides a multi-parameter collaborative optimization method of an overhead ground wire energy taking system, which can achieve the purpose of maximizing energy taking power.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a multi-parameter collaborative optimization method of an overhead ground wire energy-taking system comprises the following steps:
the method comprises the following steps: collecting basic parameters of a power transmission line of the ground wire energy taking device to be installed, wherein the basic parameters comprise parameters such as power transmission voltage grade, wire type and size, ground wire wiring mode, power transmission current, tower grounding resistance and the like;
step two: listing all possible ground wire energy obtaining schemes according to the ground wire wiring mode; calculating the energy taking power of different energy taking schemes according to the parameters in the step one;
step three: calculating the influence of the length of the electricity-taking ground wire on the electricity-taking power by taking the length of the electricity-taking ground wire as a variable;
further, drawing a change curve of the power taking power along with the length of the power taking ground wire under all power taking schemes, and marking the intersection point of the curves.
Step four: calculating the influence of the tower grounding resistance on the power taking power by taking the grounding resistance as a variable;
furthermore, under all power taking schemes, the change curve of the power taking power along with the tower grounding resistance is drawn, and the intersection point of the curves is marked.
Step five: calculating the influence of the load impedance of the power taking device on the power taking power by taking the load impedance as a variable;
furthermore, under all power taking schemes, the change curve of the power taking power along with the load impedance is drawn, and the curve intersection point is marked.
Step six: and comprehensively considering the load impedance of the electricity taking device, the length of the electricity taking ground wire and the tower grounding resistance, and determining relevant parameters and an energy taking scheme of the ground wire energy taking system.
Firstly, determining the length range of the power-taking ground wire and an optimal power-taking scheme according to the change curve of the power-taking power along with the length of the power-taking ground wire drawn in the step three;
secondly, determining the specific length of the electricity-taking ground wire and the tower position of each tower according to the change curve of the electricity-taking power along with the tower grounding resistance drawn in the step four and the grounding resistance of each tower;
and finally, determining the load impedance value of the ground wire electricity taking system according to the change curve of the electricity taking power along with the load impedance drawn in the step five.
The invention has the following beneficial effects:
the multi-parameter collaborative optimization method of the overhead ground wire energy taking system comprises the steps of listing all energy taking schemes according to the wiring mode of the ground wire of an overhead transmission line, establishing a power analysis model of each energy taking scheme, analyzing the influence rule of key parameters such as the length of the power taking ground wire, the tower grounding resistance and the load impedance on the energy taking power of the ground wire energy taking and taking system, and finally determining each key parameter of the energy taking system in a comprehensive coordination mode according to the curve of each parameter. The method provided by the invention is based on graphic analysis, can intuitively and clearly provide a theoretical analysis method for the design of the ground wire energy taking system, is simple and practical, can realize multi-parameter collaborative optimization of the energy taking system, and has an important role in improving the energy taking power of the energy taking system and meeting the load power supply requirement.
Drawings
Fig. 1 is a curve of the variation of the power taking power with the length of the power taking ground wire.
Fig. 2 is a curve of the variation of the power taking power with the grounding resistance of the tower.
Fig. 3 is a curve of the variation of the power taken with the load impedance.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
Example 1
The embodiment of the multi-parameter collaborative optimization method of the overhead ground wire energy taking system comprises the following steps of;
the method comprises the following steps: collecting basic parameters of a power transmission line of the ground wire energy taking device to be installed, wherein the basic parameters comprise parameters such as power transmission voltage grade, wire type and size, ground wire wiring mode, power transmission current, tower grounding resistance and the like.
The parameters collected in this example are as follows:
the voltage grade of the power transmission line is 110kV, the two ground wires are both sectionally insulated and grounded in a single point, and the parameters are the same. Resistance R of ground wire11.16 (omega/km); the frequency of the current is50 (Hz); a ground resistivity ρ of 300(Ω · m); effective radius r of ground wire10.0065 (m); the length l of the power-taking conducting wire is 2 (km); the tower grounding resistance R is 10 omega; current I of power transmission lineaIs 80A; the load resistance of the power taking device is 10 omega; distance d from A-phase conductor to ground wire 1a19m, distance d of phase B conductor to ground wire 1b119m, distance d of C phase conductor to ground wire 1c1＝11m。
Step two: listing all possible ground wire energy obtaining schemes according to the ground wire wiring mode; and calculating the energy taking power of different energy taking schemes according to the parameters in the step one.
In this embodiment, to two insulating ground wires, there are three kinds of installation schemes in the ground wire electricity taking device:
the first scheme is as follows: the high potential end of the electricity taking device is arranged on the insulated ground wire, the low potential end of the electricity taking device is arranged on the iron tower, and the other ground wire is in short circuit with the discharge gap of the iron tower. In the scheme, the current loop consists of iron towers at two ends and two ground wires; the energy taking power P is as follows:
uocis the supply voltage of the equivalent circuit, Zeq＝Req+jXeq，ZeqIs the internal impedance of the equivalent circuit. When the load impedance Z of the power-taking device isLAnd equivalent circuit internal resistance impedance ZeqDuring conjugation, the electricity taking device can obtain the maximum electricity taking power, and the obtained maximum active power is as follows:
scheme II: two ends of the power taking device are respectively arranged on the ground wire 1 and the iron tower, and the gap between the ground wire 2 and the iron tower is not short-circuited. In the installation mode, the ground wire 2 is not connected with a current loop, and the current loop consists of the ground wire 1 and the ground; the maximum power taking power is as follows:
the third scheme is as follows: two ends of the electricity taking device are respectively arranged on the ground wire 1 and the ground wire 2, and the gap between the ground wire and the iron tower is not short-circuited. In this case, the current loop is formed by two ground wires; the maximum power taking power is as follows:
step three: calculating the influence of the length of the electricity-taking ground wire on the electricity-taking power by taking the length of the electricity-taking ground wire as a variable;
when the length l of the power-taking ground wire is changed between 0km and 10km, and other parameters are the parameters in the step one, the change curves of the maximum power-taking power of the three power-taking schemes along with the length of the power-taking ground wire are shown in fig. 1. As can be seen from fig. 1, the power-taking power increases with the length of the power-taking ground.
Step four: calculating the influence of the tower grounding resistance on the power taking power by taking the grounding resistance as a variable;
when the tower ground resistance R changes between 0 Ω and 50 Ω and other parameters are the parameters in step one, the curves of the maximum energy-taking power of the three energy-taking schemes along with the change of the tower ground resistance are shown in fig. 2.
Step five: calculating the influence of the load impedance of the power taking device on the power taking power by taking the load impedance as a variable;
when the load impedance is changed between 0 and 50 omega and other parameters are the parameters in the step one, the curve of the energy-taking power of the three energy-taking schemes along with the change of the load impedance is shown in fig. 3.
Step six: comprehensively considering the load impedance of the electricity taking device, the length of the electricity taking ground wire and the tower grounding resistance, and determining relevant parameters and an energy taking scheme of the ground wire energy taking system;
according to the variation curve of the power taking power along with the length of the power taking ground wire, firstly, the length range of the power taking ground wire is determined, as can be seen from fig. 1, the power taking power is increased along with the increase of the length of the power taking ground wire, and the length of the power taking ground wire is determined according to the power required by the load. Assuming that the maximum power of the load requiring power taking system is not lower than 2W, the length of the power taking ground wire is not lower than 4km, and selecting a second scheme of the energy taking scheme;
and secondly, determining the specific length of the power-taking ground wire and the tower position of each tower according to the change curve of the power-taking power along with the tower grounding resistance and the grounding resistance of each tower. As can be seen from fig. 2, in the range that the length of the power-taking ground wire is not less than 4km, a tower with the tower grounding resistance lower than 10 Ω is selected as a ground wire short-circuit tower;
and finally, determining the load impedance of the ground wire power taking system according to the change curve of the power taking power along with the load impedance. As can be seen from fig. 3, the load impedance of the power-taking system needs to be close to 20 Ω.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A multi-parameter collaborative optimization method of an overhead ground wire energy-taking system is characterized by comprising the following steps;
the method comprises the following steps: collecting basic parameters of a power transmission line of the ground wire energy taking device to be installed, wherein the basic parameters comprise power transmission voltage grade, wire type and size, ground wire wiring mode, power transmission current and tower grounding resistance;
step two: listing all possible ground wire energy obtaining schemes according to the ground wire wiring mode; calculating the energy taking power of different energy taking schemes according to the parameters in the step one;
step three: calculating the influence of the length of the electricity-taking ground wire on the electricity-taking power by taking the length of the electricity-taking ground wire as a variable;
step four: calculating the influence of the tower grounding resistance on the power taking power by taking the tower grounding resistance as a variable;
step five: calculating the influence of the load impedance of the power taking device on the power taking power by taking the load impedance of the power taking device as a variable;
step six: and comprehensively considering the load impedance of the electricity taking device, the length of the electricity taking ground wire and the tower grounding resistance, and determining relevant parameters and an energy taking scheme of the ground wire energy taking system.
2. The multi-parameter collaborative optimization method of the overhead ground wire energy-taking system according to claim 1,
in the third step, drawing a change curve of the power taking power along with the length of the power taking ground wire under all power taking schemes, and marking the intersection point of the curves;
step four, drawing a change curve of the power taking power along with the tower grounding resistance under all power taking schemes, and marking a curve intersection point;
and step five, drawing a change curve of the power taking power along with the load impedance of the power taking device under all power taking schemes, and marking curve intersection points.
3. The multi-parameter collaborative optimization method for the overhead ground wire energy-taking system according to claim 2, wherein in the sixth step, the determination of the relevant parameters and the energy-taking scheme of the ground wire energy-taking system specifically comprises:
firstly, determining the length range of the power-taking ground wire and an optimal power-taking scheme according to the change curve of the power-taking power along with the length of the power-taking ground wire drawn in the step three;
secondly, determining the specific length of the electricity-taking ground wire and the tower position of each tower according to the change curve of the electricity-taking power along with the tower grounding resistance drawn in the step four and the grounding resistance of each tower;
and finally, determining the load impedance value of the ground wire electricity taking system according to the change curve of the electricity taking power along with the load impedance drawn in the step five.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104573245A (en) * | 2015-01-15 | 2015-04-29 | 国家电网公司 | Computing method of ground wire loss in ultra high voltage power transmission line |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104573245A (en) * | 2015-01-15 | 2015-04-29 | 国家电网公司 | Computing method of ground wire loss in ultra high voltage power transmission line |
Non-Patent Citations (6)
| Title |
|---|
| WANG RUI: "Analysis on Affection Factor of Power Energy Loss of Overhead Ground Wire of Double Circuit Transmission Line on the Same Tower", 《GUANGDONG ELECTRIC POWER》 * |
| 刘益岑等: "典型架空输电线路电磁取能地线的选择", 《四川电力技术》 * |
| 王路: "输电线路分段地线感应取能方法的研究", 《集成电路应用》 * |
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Application publication date: 20200410 |