Overhead power transmission line reinforcement planning method based on power transmission tower load reliability
An overhead transmission line and reliability technology, applied in the field of reinforcement planning of overhead transmission lines based on the reliability of transmission tower loads
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Embodiment 1
[0149] Based on the statistical data on the movement of typhoons in the western Pacific Ocean that landed in my country's coastal areas from 1998 to 2018, the extraction results of typical typhoon landing parameters are shown in Table 1-3. Combining the four typhoon landing points (22°30′N, 112°40′E), (22°24′N, 112°27′E), (22°12′N, 112°14′E) and (21° °54′N, 112°1′E), forming 256 typical typhoon scenarios, and each typhoon scenario can simulate a typhoon movement.
[0150] Table 1 Typical typhoon landing direction angle
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[0152] Table 2 Typical typhoon landing movement speed
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[0154] Table 3 Pressure difference of typical typhoon landing center
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[0156] The parameters of the storm track model for simulating the typhoon movement path are shown in Table 4-5; the mathematical expression of the storm track model is: Δlnc(t+1)=-0.3522+0.0046ψ(t)-0.0056λ (t)-0.0287lnc(t)-0.0008θ(t), Δθ(t+1)=2.3777-0.0176ψ(t)-0.0024λ(t)+0.0649c(t)-0.8509θ(t)+0.17...
Embodiment 2
[0164] The IEEE-24 node transmission system is used as the test system; the design load effect ratio of the transmission tower components and the corresponding design wind speed are shown in Table 6; the main material of the transmission tower body is divided into 6 units; it is assumed that typhoons occur twice a year on average; The level-related information is shown in Table 7; each level of reinforcement corresponds to a component design load effect ratio; ∞ level of reinforcement represents an ideal reinforcement, that is, it is considered that the reinforced line will not fail due to typhoon wind. Line repair time is 24h. The unit period is 15 minutes, that is, ΔT=0.25h. The spatial location of the transmission line is as Figure 4 As shown; the relative position of the transmission system and the typical typhoon movement path with the landing point of (105.6km, 55.5km) is as follows Figure 5 shown.
[0165] Table 6 The design wind speed of the transmission tower and...
Embodiment 3
[0180] For the above typical typhoons, Figure 6 The real-time load reliability change curve of the node 3 transmission tower is plotted. Figure 7 The real-time load reliability curve of line L3-9 is drawn. It can be seen that the change law of load reliability of line L3-9 is quite different from that of node 3 transmission tower load reliability.
[0181] Set a reinforcement level, namely N h =1. According to calculations, when no transmission lines are reinforced, the annual power shortage of the transmission system is 377,566.70kWh, and the annual cost of repairing the damaged lines is 36,129.48 US dollars, and the annual economic loss is 413,696.18 US dollars. Table 11 and Table 12 give the calculation results of transmission line reinforcement planning under various reinforcement levels.
[0182] Under reinforcement level 1, 12 transmission lines in the transmission system are reinforced, and the annual reinforcement cost is $104,471.08; the annual power loss is 857...
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