Hybrid modular multilevel converter-based topology structure and deicing device
A modular multi-level and topology technology, which is used in the installation of cables, the conversion device of output power, the conversion of AC power input into DC power output, etc., can solve the problem of high power switching devices and corresponding auxiliary circuits, and high cost , large volume and other problems, to achieve the effect of flexible and effective control, reducing the size of the device and improving the reliability of operation
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Embodiment 1
[0062] Figure 7 The DC ice melting device designed by the present invention for a typical 220kV transmission line is given. The capacity of a single main transformer in a typical 220kV substation is 180MVA. The outgoing line of the substation generally uses LGJ-2*240 / 40, and the line length is 100km. According to the calculation results of DC ice melting calculation formula under typical conditions (-5°C, wind speed 5m / s, ice thickness 10mm, 1h ice melting), the typical minimum ice melting current of LGJ-2*240 / 40 type conductor is 1167A , The minimum power capacity required for a 100km line is about 17.9MW, and the DC resistance is not greater than 0.06045Ω / km. Since the ice-melting time of the minimum ice-melting current corresponds to 1 hour or even longer, the output current of the ice-melting device in actual projects is generally higher than the minimum ice-melting current to speed up the ice-melting speed. According to engineering experience, when the output current rea...
Embodiment 2
[0065] Figure 8 The DC deicing device designed for a typical 110kV transmission line of the present invention is given. The capacity of a single main transformer in a typical 110kV substation is 40MVA. The outgoing line of the substation generally uses LGJ-300 / 50, and the line length is 50km. According to the calculation formula of DC ice melting, the typical minimum ice melting current of LGJ-300 / 50 type conductor is 714A, the minimum power supply capacity required for a 50km line is about 5.0MW, and the DC resistance is not greater than 0.09636Ω / km. Set the DC ice melting device The output voltage is 15kV. At this time, the ice-melting current reaches 1557A, which can quickly melt ice in a short time. In addition, the output voltage can be adjusted between 0-15kV.
[0066] Figure 9 Shown is a block diagram of the integrated control system of the present invention, including the direct bridge arm current control scheme including total capacitor voltage control, upper / lower...
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