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

Inactive Publication Date: 2016-01-13
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

"A Containerized DC Ice Melting System and Control Method" disclosed by the Chinese invention patent with the publication number CN103715643A, "DC ice melting device based on voltage source converter and its control method" disclosed by the Chinese invention patent with the publication number CN103915808A Method", publication number is CN104319786A Chinese invention patent disclosed "a kind of DC ice melting device control system based on SVG" and publication number is CN104078909A Chinese invention patent disclosed "a kind of voltage source type DC ice melting and static synchronous compensation The topology scheme of the DC ice-melting device proposed in "Device and Its Control Method" is basically the same as the above-mentioned scheme, and their common feature is the MMC topology structure based on the full-bridge sub-module, so the high-power switching devices and corresponding auxiliary circuits used More, greater loss, higher cost, larger volume, there is a certain amount of unnecessary waste

Method used

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  • Hybrid modular multilevel converter-based topology structure and deicing device
  • Hybrid modular multilevel converter-based topology structure and deicing device
  • Hybrid modular multilevel converter-based topology structure and deicing device

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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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Abstract

The invention discloses a hybrid modular multilevel converter-based topology structure and a deicing device. With a three-phase hybrid modular multilevel converter as a main circuit, each phase is formed by mixing cascaded half-bridge sub-modules and full-bridge sub-modules; and the quantity ratio of the half-bridge sub-modules to the full-bridge sub-modules in each phase is 1 to 1. Output voltage of a direct-current bus of the hybrid modular multilevel converter disclosed by the invention can be continuously adjustable from zero to the maximum value; when the topology structure is used as the direct-current deicing device, a flexible and effective control on direct-current deicing current can be achieved to meet the deicing requirements of different lines. In addition, the topology structure can also be used as an STATCOM; and power switching devices can be saved by 25%.

Description

technical field [0001] The invention relates to a topological structure and an ice-melting device based on a hybrid modular multilevel converter. Background technique [0002] Under the long-term trend of global warming, the problem of icing on power grids will be particularly prominent in some areas. The current power transmission system is designed to cover 10mm of ice. In case of extreme disaster weather, ice and snow disasters will cause large-scale power outages. At present, there are mainly thermal deicing, mechanical deicing, passive deicing and other methods for power grid deicing, all of which have deficiencies in varying degrees. Because most of the high-voltage transmission lines are erected in the wilderness and among the mountains, once ice is formed, it is difficult to achieve the purpose of timely deicing by mechanical deicing in terms of the current technical level. Therefore, thermal ice melting is still a feasible and common method at present. Both AC and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/12H02M7/219H02G7/16H02J3/18
CPCH02M7/5388H02M7/4835
Inventor 王广柱冯建洲吴钦欧朱建商秀娟
Owner SHANDONG UNIV
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