A balanced control method for full bridge MMC capacitor voltages

A capacitor voltage, balanced control technology, applied in the direction of AC network voltage adjustment, electrical components, output power conversion devices, etc.

Inactive Publication Date: 2014-03-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the above-mentioned technical problems existing in the prior art, the present invention provides a method for equalizing the capacitor voltage of the full-bridge MMC, which not only can effectively reduce the switching frequency of the sub-modules wh

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  • A balanced control method for full bridge MMC capacitor voltages
  • A balanced control method for full bridge MMC capacitor voltages
  • A balanced control method for full bridge MMC capacitor voltages

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Embodiment Construction

[0055] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0056] figure 1 A schematic diagram of the full-bridge MMC structure is given. The full-bridge MMC is composed of three-phase six bridge arms, and each bridge arm is formed by cascading a bridge arm series inductor and several full-bridge sub-modules with the same structure. Each full-bridge sub-module consists of a capacitor C and four IGBT tubes T1~T4; among them, the collector of the IGBT tube T1 is connected to the collector of the IGBT tube T2 and one end of the capacitor C, and the emitter of the IGBT tube T1 is connected to the IGBT The collector of the tube T3 is connected to one end (A terminal) of the full bridge sub-module, the emitter of the IGBT tube T3 is connected to the emitter of the IGBT tube T4 and the other end of the capacitor C, and...

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Abstract

The invention discloses a balanced control method for full bridge MMC capacitor voltages. The method comprises the following steps: (1) a positive input record database, a negative input record database and an abscission record database are established; (2) a sub-module with a maximum capacitor voltage and a minimum capacitor voltage in the record databases and on bridges arms are found out; (3) according to information such as bridge arm levels, bridge arm currents and the capacitor voltages, sub-modules which need to be subjected to switching are selected through logic judgment; and (4) corresponding switching operation is carried out on the selected sub-modules, and data updating is carried out on the record database. According to the invention, under a condition that the capacitor voltages are maintained to be stable, the switching frequency of the sub-modules can be effectively reduced; losses of a transverter can be reduced; and simultaneously, decrease in the system control frequency and system operation performance deterioration, etc., due to ordering problems are avoided.

Description

technical field [0001] The invention belongs to the technical field of power electronic systems, and in particular relates to a method for equalizing and controlling the capacitor voltage of a full-bridge MMC. Background technique [0002] Since Professor R.Marquardt proposed the half-bridge modular multilevel converter (MMC) based on the half-bridge sub-module cascading, in recent years, the half-bridge MMC technology has been vigorously developed, experts and scholars from all over the world Extensive and in-depth research has been carried out on it. Full-bridge MMC is formed by cascading full-bridge sub-modules. Compared with half-bridge MMC, full-bridge MMC has more flexible and superior characteristics, such as DC fault ride-through capability, and a hybrid DC transmission system composed of traditional thyristor converters. It has better trend reversal ability, etc., and has a wider application space. [0003] Whether the sub-module capacitor voltage is balanced seri...

Claims

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Application Information

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IPC IPC(8): H02M7/219H02J3/16
CPCY02E40/34Y02E40/30
Inventor 徐政许烽刘高任肖晃庆
Owner ZHEJIANG UNIV
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