A reduced-scale equivalent physical experiment method for transmission lines
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A technology for transmission lines and physical experiments, applied in the field of effective physical experiments, can solve problems such as not reflecting the characteristics along the line, and achieve the effect of ensuring equivalence
Inactive Publication Date: 2019-08-09
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +3
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The advantage of using software simulation is time-saving and labor-saving, but it cannot fully consider more complex conditions, such as: soil resistivity, adjacent lines, mixed line erection, etc.
The dynamic model test is based on the similarity theory and is established with similar components with the same physical properties as the prototype system. The long-distance transmission line is divided into many π-type equivalent circuits, which can only reflect the characteristics of each node on the line, and cannot reflect the characteristics of the nodes along the line. characteristics
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Embodiment 1
[0085] like figure 1 As shown, the conductors of an AC 1000kV UHV transmission line are arranged in a triangle. Select the working frequency f as 10kHz, scale down 200 times, and select the scale-down scheme with constant conductivity of the wire, namely: N=200, N 1 =14.14,N 2 = 1, the circuit parameters before and after scaling are shown in Table 2.
[0086] Table 2. Triangular arrangement of conductors, circuit parameters before and after scaling when the scale is 200 times
[0087]
Embodiment 2
[0089] like figure 1 As shown, the conductors of an AC 1000kV UHV transmission line are arranged in a triangle. Select the working frequency f as 100kHz, scale down 2000 times, and select the scale-down scheme with constant conductivity of the wire, namely: N=2000, N 1 =44.72, N 2 =1, the circuit parameters before and after scaling are shown in Table 3. Use PSCAD simulation to verify the equivalence of the line before and after scaling. The original model and scaled model of the half-wavelength power transmission are as follows image 3 shown;
[0090] Table 3. Triangular arrangement of conductors, circuit parameters before and after scaling when the scale is 2000 times
[0091]
[0092] The voltage amplitude of the given voltage source line is 1000kV, the voltage amplitude of the two models is the same as the value of the load, and the load size is respectively selected to match the load value Z C , 0.5Z C , 2Z C , open circuit in four cases. The transmission line ...
Embodiment 3
[0095] like figure 2 As shown, the conductors of an AC 1000kV UHV transmission line are arranged horizontally. Select the working frequency f as 10kHz, scale down 200 times, and select the scale-down scheme with constant conductivity of the wire, namely: N=200, N 1 =14.14,N 2 =1, the circuit parameters before and after scaling are shown in Table 5.
[0096] Table 4 Load voltage under two models
[0097]
[0098] Table 5 Conductors arranged horizontally and scaled 200 times before and after scaled circuit parameters
[0099]
[0100]
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Abstract
The invention discloses a reduced scale equivalent physical experiment method for an electric transmission line, and belongs to the technical field of high voltage overhead power transmission. The method comprises the steps that firstly, an electric transmission line reduced scale equivalent physical experiment is set in an ultra-long distance and large-capacity half-wavelength (3,000 km) power transmission mode; secondly, three reduced scale schemes of an equal proportion reduced scale, an equal electric conductivity reduced scale and an equal radius reduced scale are provided according to the relation among the reduced scale multiple, frequency and half wavelength of the electric transmission line reduced scale equivalent physical experiment; the equal electric conductivity reduced scale scheme is selected preferentially through calculation and comparison. Compared with an existing method for researching electric transmission line transmission characteristics, the equivalence before and after the electric transmission line reduced scale can be ensured, and a real electric transmission line is accurately simulated. The method has the advantages that a circuit is easy to construct and the equivalence is good, and has the good application prospect on the occasion that the electric transmission line needs to be used for performing an experiment.
Description
technical field [0001] The invention belongs to the technical field of high-voltage overhead power transmission, and in particular relates to a reduced-scale equivalent physical experiment method of a power transmission line. Background technique [0002] Since the 21st century, with the increasing demand for energy in the world, the development of power resources in various countries has also begun to accelerate. However, most of the distribution of primary energy is far away from the load center, such as the hydropower resources in the Amazon Basin of Brazil, the hydropower resources in Siberia in Russia, and the coal resources in Northwest China. Ultra-long-distance, large-capacity power transmission technology is attracting the attention of scholars from all over the world. In recent years, UHV DC transmission has developed very rapidly. In terms of UHV AC power transmission, point-to-point, ultra-long-distance, and large-capacity half-wavelength (3000km) power transmi...
Claims
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