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Hybrid Modular Multilevel Converter Applicable to Low-Frequency Operation and Its Control Method

A modular multi-level, commutation device technology, applied in output power conversion devices, irreversible DC power input to AC power output, electrical components and other directions, can solve problems such as capacitor voltage fluctuations and reduce capacitance. Voltage fluctuation, the effect of avoiding increased loss

Active Publication Date: 2018-09-11
HARBIN INST OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of capacitor voltage fluctuations in MMC low-frequency operation, and the present invention provides a hybrid modular multi-level converter device and its control method suitable for low-frequency operation

Method used

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  • Hybrid Modular Multilevel Converter Applicable to Low-Frequency Operation and Its Control Method
  • Hybrid Modular Multilevel Converter Applicable to Low-Frequency Operation and Its Control Method
  • Hybrid Modular Multilevel Converter Applicable to Low-Frequency Operation and Its Control Method

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specific Embodiment approach 1

[0042] Specific implementation mode one: combine figure 1 Describe this embodiment, the hybrid modular multi-level converter device and its control method suitable for low-frequency operation described in this embodiment, the principle is as follows figure 1 As shown, the converter device includes a series switch, a snubber circuit, a ground circuit and a modular multilevel converter;

[0043] The series switch is connected in series between the DC bus and the DC side of the modular multilevel converter, and the buffer circuit and the grounding circuit are respectively connected in parallel on the DC side of the modular multilevel converter;

[0044] The modular multilevel converter is composed of a three-phase circuit, each phase circuit includes two upper and lower bridge arms, each bridge arm is composed of an inductor L and N sub-modules SM with the same structure in series, each sub-module SM consists of a half-bridge power unit and a capacitor C.

[0045] Series switches...

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Abstract

The invention provides a hybrid modular multilevel converter suitable for low frequency operation and a control method thereof, belongs to the field of power electronics, and aims at solving the problems of capacitor voltage fluctuation in low frequency operation of a MMC. The converter device comprises a series switch, a buffer circuit, a grounding circuit and the modular multilevel converter. The series switch is connected in series between a DC bus and the DC side of the modular multilevel converter. The buffer circuit and the grounding circuit are respectively connected in parallel at the DC side of the modular multilevel converter. The modular multilevel converter is composed of three-phase circuits. Each phase of circuit is comprises upper and lower bridge arms. Each bridge arm is formed by one electric inductor L and N submodules SM of the same structure through series connection. Each submodule SM comprises a half-bridge power unit and a capacitor C. The hybrid modular multilevel converter is used for high-voltage motor variable-frequency speed regulation.

Description

technical field [0001] The invention belongs to the field of power electronics, and in particular relates to a hybrid modular multilevel converter suitable for low-frequency operation and a control method thereof. Background technique [0002] Modular multilevel converter (MMC), as a new type of high-voltage and high-power power conversion technology, has been widely used in the fields of flexible direct current transmission and power quality control in recent years. At the same time, people have also begun to study whether MMC can be applied in the field of frequency conversion and speed regulation of high-voltage motors. Because compared with the traditional cascaded H-bridge inverter, MMC not only retains most of its advantages (such as high efficiency, multi-level voltage output, modular structure, easy installation and maintenance), more importantly, it can save The phase-shifting transformers in the cascaded H-bridge inverters, which are expensive, bulky and have seri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/49H02M1/34
CPCH02M1/34H02M7/49
Inventor 徐殿国李彬彬周少泽石绍磊关明旭
Owner HARBIN INST OF TECH
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