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Modular multilevel converter (MMC) four-quadrant frequency converter

A modular multi-level, four-quadrant inverter technology, applied in the inverter field, can solve problems such as large current impact, capacitor voltage fluctuation, etc., to avoid the effect of increasing loss

Active Publication Date: 2017-04-26
HARBIN INST OF TECH
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Problems solved by technology

[0004] The present invention aims at problems such as capacitor voltage fluctuations existing in MMC low-frequency operation, and high-frequency injection method will bring relatively large current impact, etc., the present invention proposes a modular multi-level converter four-quadrant frequency converter

Method used

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  • Modular multilevel converter (MMC) four-quadrant frequency converter
  • Modular multilevel converter (MMC) four-quadrant frequency converter
  • Modular multilevel converter (MMC) four-quadrant frequency converter

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Embodiment Construction

[0026] Combine below Figure 1 to Figure 11 Describe the four-quadrant frequency converter of the modular multilevel converter of the present invention.

[0027] figure 1 A specific circuit topology diagram of a modular multilevel converter four-quadrant inverter is given. The grid side modular multilevel converter is a three-phase bridge rectifier circuit. Each phase includes two upper and lower bridge arms. A bridge arm consists of an inductor L and N sub-modules SM with the same structure 1 , SM 2 ...SM N stacked, where the upper-side submodule SM 1 , SM 2 ...SM N It is a full-bridge sub-module, which includes a full-bridge power unit and a set of capacitors C; the lower-bridge arm sub-module is a half-bridge power unit, which includes a half-bridge power unit and a set of capacitors C. The full bridge power unit consists of S 1 , S 2 , S 3 , S 4 Composed of four switching devices, connected in parallel with capacitor C, the voltage across capacitor C is U C , t...

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Abstract

The invention discloses a modular multilevel converter (MMC) four-quadrant frequency converter and belongs to the field of electric power and electronics, for solving the problems of capacitive voltage fluctuations existing during low-frequency operation of an MMC, quite large current impact brought by a high-frequency injection method and the like. The MMC four-quadrant frequency converter comprises two MMCs connected in a back-to-back mode, and the two MMCs are a network-side MMC and a machine-side MMC; and the power supply input end of the network-side MMC is connected with an AC power network, the DC bus output end of the network-side MMC is connected with the DC bus input end of the machine-side MMC, and the load output end of the machine-side MMC is connected with a motor type load.

Description

technical field [0001] The invention belongs to the field of power electronics, and in particular relates to a frequency converter with a hybrid modular multilevel topology. Background technique [0002] Modular multilevel converter (MMC) is a power electronic device that has developed rapidly in recent years and is suitable for high-voltage and high-power electric energy conversion applications. In addition to high-voltage direct current transmission, MMC is also used in the field of frequency converters. Compared with the existing high-voltage and large-capacity inverters that mostly use H-bridge inverters, MMC not only retains its advantages of high efficiency, multi-level voltage output, modular structure, and easy installation and maintenance, but also saves the need for cascaded H bridges. The costly and loss-heavy phase-shifting transformers in bridge drives can be directly connected to the grid and powered via a common DC bus. The flexible and simple structure of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/44
CPCH02M5/44H02M5/4505H02M5/4585H02M1/0067H02M7/5388H02M7/4835
Inventor 李彬彬关明旭周少泽徐殿国
Owner HARBIN INST OF TECH
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