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Modular multilevel converter for high-voltage DC power transmission and control method thereof

A modular multi-level, high-voltage DC power transmission technology, applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc., can solve the problem of system stability and reliability reduction, switching device switching frequency High, capacitor voltage is easy to fluctuate, etc., to achieve the effect of uniform switching frequency, multi-performance, and capacitor voltage balance

Inactive Publication Date: 2017-12-15
冯一轩
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, in actual operation, the capacitor voltage of the power module is easy to fluctuate, and the capacitor voltage of the modular multilevel converter for HVDC power transmission must be balanced and controlled to keep the capacitor voltage within a certain fluctuation range as much as possible to reduce the impact on the system. Impact
[0003] During the balance control process of the capacitor voltage, the switching frequency of the switching device is too high, and the frequency of use of different switches is uneven, which will easily lead to a decrease in the stability and reliability of the system

Method used

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  • Modular multilevel converter for high-voltage DC power transmission and control method thereof
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  • Modular multilevel converter for high-voltage DC power transmission and control method thereof

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[0038] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0039] It should be understood that terms such as "having", "comprising" and "including" as used herein do not entail the presence or addition of one or more other elements or combinations thereof.

[0040] Figure 1-3 It shows an implementation form according to the present invention, a modular multilevel converter (MMC) for a HVDC power transmission system, such as figure 1 The shown includes three identical phase units, each phase unit includes two completely symmetrical upper bridge arms and lower bridge arms, each bridge arm includes N sub-modules and a reactor in series, and in steady state operation, each A phase unit is put into N submodules, U d It is the DC side voltage of the MMC, and the bridge arm reactor can suppress the interphase circulation, reduce the harmonic distortion rate of the bridge arm current, and can suppress the ...

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Abstract

The invention discloses a modular multilevel converter for high-voltage DC power transmission and a control method thereof. The modular multilevel converter includes three phase units. Each phase unit includes an upper bridge arm and a lower bridge arm which are symmetrical. Each bridge arm includes N sub modules and a reactor connected in series with the sub modules. The sub modules are double-clamped sub modules. According to the modular multilevel converter for high-voltage DC power transmission and the control method thereof, the MMC can be equivalent to two separate sub topological structures to achieve working states such as double switch-on, double switch-off, single switch-on single switch-off, and single switch-off single switch-on, and the sub modules can be sorted through a voltage-frequency weighting method to make the switching frequency of the IGBTs of the sub modules uniform.

Description

technical field [0001] The invention relates to the field of high voltage direct current transmission. More specifically, the present invention relates to a modular multilevel converter for high-voltage direct current transmission and a control method thereof. Background technique [0002] In recent years, modular multilevel converters (MMCs) have been widely used in high-voltage direct current transmission systems, making multi-terminal high-voltage direct current transmission technology easy to implement. However, in actual operation, the capacitor voltage of the power module is easy to fluctuate, and the capacitor voltage of the modular multilevel converter for HVDC power transmission must be balanced and controlled to keep the capacitor voltage within a certain fluctuation range as much as possible to reduce the impact on the system. Impact. [0003] During the balance control process of the capacitor voltage, the switching frequency of the switching device is too high...

Claims

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Application Information

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IPC IPC(8): H02M7/00H02M7/487H02M7/5387H02J3/36
CPCH02J3/36H02M7/00H02M7/487H02M7/5387H02M1/0067Y02E60/60
Inventor 冯一轩
Owner 冯一轩
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