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Modular Multilevel Converter Four-Quadrant Frequency Converter

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

Active Publication Date: 2019-01-04
HARBIN INST OF TECH
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  • Claims
  • Application Information

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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 Four-Quadrant Frequency Converter
  • Modular Multilevel Converter Four-Quadrant Frequency Converter
  • Modular Multilevel Converter 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 relates to a four-quadrant frequency converter of a modular multilevel converter, which belongs to the field of power electronics. The invention aims to solve the problems of capacitor voltage fluctuations in low-frequency operation of MMC, and large current impact caused by high-frequency injection methods. The present invention includes two groups of modular multilevel converters connected back to back, and the two groups of modular multilevel converters are grid side modular multilevel converters and machine side modular multilevel converters The power input terminal of the grid-side modular multilevel converter is connected to the AC power grid, and the DC bus output terminal of the grid-side modular multilevel converter is connected to the DC of the machine-side modular multilevel converter. The input terminal of the bus bar and the load output terminal of the modular multilevel converter on the machine side are connected to motor loads.

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 Patents(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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