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Circuit topology structure of LCC-MMC hybrid alternating current converter

A technology of circuit topology and exchange flow, which is applied to AC network circuits, AC power input conversion to DC power output, and AC power input conversion to AC power output. It can solve the problem of high investment cost, improve reliability and reduce The effect of high volume, cost and reliability

Pending Publication Date: 2022-02-15
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology can quickly and independently control active and reactive power within the operating range. The receiving end system can be a passive network, which has the advantages of low loss, high waveform quality, and strong fault handling capabilities. However, due to the need for a large number of IGBT components, the investment cost is too high

Method used

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  • Circuit topology structure of LCC-MMC hybrid alternating current converter
  • Circuit topology structure of LCC-MMC hybrid alternating current converter
  • Circuit topology structure of LCC-MMC hybrid alternating current converter

Examples

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Effect test

Embodiment 1

[0043] refer to Figure 8 , the present invention is applied to the scene where the frequency division power grid is connected to the power frequency power grid.

[0044] The frequency division grid and the power frequency grid are both active networks, and the neutral point of the DC side of the LCC-MMC hybrid AC converter is not grounded, that is figure 1 middle n 11 point only with p 21 point connected, n 12 point only with p 22 The dots are connected. For scenarios with low power and low DC voltage, only the positive part or the negative part can be equipped to improve the economy of the overall system.

[0045] For LCC, since it is connected to the active network, the phase commutation of the 3-phase full-bridge LCC converter can be realized. Under normal circumstances, the rectifier side adopts constant DC current control, and the inverter side adopts constant turn-off angle control. In addition, the rectifier side and the inverter side are also equipped with auxil...

Embodiment 2

[0049] refer to Figure 9 , the present invention is applied to the scene of frequency division offshore wind power grid connection.

[0050] The 50 / 3Hz low-frequency electric energy generated by the frequency-divided offshore fan is collected to the frequency-divided offshore step-up station through the collector line, and then transmitted to the land through the frequency-divided submarine cable. The conversion from the frequency-divided electric energy to the industrial frequency electric energy is realized through the present invention. Complete the grid connection of frequency division offshore wind farms. The DC side neutral point of the present invention is grounded, that is figure 1 middle n 11 point n 12 point, p 21 point and p 22 Point to ground.

[0051] For the rectifier module, because the offshore wind farm adopts the Maximum Power Point Tracking (MPPT) mode, the converter is required to provide voltage for the wind farm. Since the LCC does not have the abi...

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Abstract

The invention discloses a circuit topology structure of an LCC-MMC hybrid alternating current converter. The circuit topology structurecomprises a positive electrode part and a negative electrode part, and is characterized in that the positive electrode part comprises a first LCC-MMC rectification module and a first LCC-MMC inversion module, the negative electrode part comprises a second LCC-MMC rectification module and a second LCC-MMC inversion module, the first LCC-MMC rectification module, the first LCC-MMC inversion module, the second LCC-MMC inversion module and the second LCC-MMC rectification module are connected in sequence to form a series loop, an external first system is connected with the first LCC-MMC rectification module and the second LCC-MMC rectification module, and an external second system is connected with the first LCC-MMC inversion module and the second LCC-MMC inversion module. According to the invention, the structure can independently control active power and reactive power, and is low in cost.

Description

technical field [0001] The invention belongs to the field of topological structure of high-voltage and high-power power conversion devices, and relates to a circuit topological structure of an LCC-MMC hybrid AC converter. Background technique [0002] The practical engineering application of high-voltage and high-power AC converters is very extensive, and it plays a very important role in asynchronous networking, offshore wind power, long-distance frequency division power transmission, offshore oil and gas exploration, and future submarine power transmission and distribution system construction. In addition, high-power AC converters are also indispensable in power transmission such as rail transit, mining, smelting, and steel rolling, as well as high-voltage and high-power power supply industries. [0003] The AC converter is the core component of the flexible frequency division transmission system. Currently, the mainstream converter topology adopts modular multi-level tech...

Claims

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Application Information

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IPC IPC(8): H02M5/458H02M7/162H02M7/19H02M7/219H02M7/25H02M7/483H02M7/521H02M7/5387H02M1/12H02J3/38
CPCH02M5/4585H02M7/162H02M7/19H02M7/219H02M7/25H02M7/483H02M7/521H02M7/5387H02M1/12H02J3/381H02J2300/28Y02P80/20
Inventor 孟永庆厉璇闫书豪马春喆胡雅涵苑宾张和高子健尹聪琦
Owner XI AN JIAOTONG UNIV
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