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A Balanced Control Method of Hybrid MMC Capacitor Voltage

A capacitor voltage, balance control technology, applied in electrical components, output power conversion devices, AC power input into DC power output and other directions, can solve the problems of complex and diverse switching methods, reduce switching frequency, maintain energy balance , the effect of reducing switching loss

Active Publication Date: 2016-04-06
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existence of these three levels makes the switching method more complex and diverse, and the capacitor voltage balancing strategy needs to be redesigned

Method used

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  • A Balanced Control Method of Hybrid MMC Capacitor Voltage
  • A Balanced Control Method of Hybrid MMC Capacitor Voltage
  • A Balanced Control Method of Hybrid MMC Capacitor Voltage

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Embodiment Construction

[0051] 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.

[0052] figure 1 A schematic diagram of the hybrid modular multilevel converter is given. The hybrid modular multilevel converter is composed of three-phase six bridge arms, and each bridge arm is formed by cascading a bridge arm series inductor and several half-bridge sub-modules and full-bridge sub-modules. The proportion of the half-bridge sub-module and the full-bridge sub-module depends on the project requirements. Each half-bridge sub-module includes a capacitor C, two IGBT tubes T1, T2 and two diodes D1, D2; wherein, the collector of the IGBT tube T1 is connected to the generator electrode of the IGBT tube T2 and one end of the capacitor C, The emitter of the IGBT tube T1 is connected to the collector of the IGBT tube T2 and is one end of the half...

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Abstract

The invention discloses a hybrid MMC capacitor voltage balance control method which comprises the following steps that (1) a positive input record library, a negative input record library and a removal record library are built, (2) the maximum voltage deviation value of a sub-module capacitor in a bridge arm is determined, (3) according to the maximum voltage deviation value of the sub-module capacitor in the bridge arm, repeated input operation of the sub-module of the bridge arm is analyzed through judgment logic, and the record libraries are updated, (4) according to the bridge arm level difference before a moment and after the moment, sub-module switching operation is carried out in the bridge arm through a logic judgment and control strategy, and the record libraries are updated. By means of the method, switch frequency of the sub-module is effectively lowered on the situation that capacitor voltage keeps stable, converter loss is reduced, and meanwhile the problem that system operation performance deteriorates due to sequencing problems can be reduced.

Description

technical field [0001] The invention belongs to the technical field of power system control, and in particular relates to a hybrid MMC capacitor voltage equalization control method. Background technique [0002] Since Professor R. Marquardt of the Bundeswehr University in Munich, Germany proposed the Modular Multilevel Converter (MMC) in 2001, experts and scholars from all over the world have carried out extensive and in-depth research on it. On the basis of the half-bridge MMC, the full-bridge MMC is formed by cascading full-bridge sub-modules to realize the four-quadrant operation of DC voltage and DC current, thus having more flexible and superior characteristics. However, a full-bridge MMC uses almost twice as many power electronics as a half-bridge MMC of the same capacity and voltage class. The hybrid MMC composed of half-bridge sub-modules and full-bridge sub-modules combines the advantages of the two topologies. Each bridge arm is composed of half-bridge sub-modules...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M7/5387
Inventor 徐政董桓锋刘高任许烽周煜智
Owner ZHEJIANG UNIV
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