Control and switch method for redundant submodules of modular multilevel converter

A modular multi-level, redundant control technology, applied in electrical components, circuit devices, emergency power supply arrangements, etc., to achieve the effects of good reliability, shortened fault recovery time, and easy implementation

Active Publication Date: 2013-08-14
ZHUZHOU NAT ENG RES CENT OF CONVERTERS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the redundant sub-module in hot standby replaces the faulty sub-module, it needs to go through a capacitor charging process before it can be put into operation, and a certain reaction time is still required

Method used

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  • Control and switch method for redundant submodules of modular multilevel converter
  • Control and switch method for redundant submodules of modular multilevel converter
  • Control and switch method for redundant submodules of modular multilevel converter

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specific Embodiment approach

[0059] A specific implementation of a modular multilevel converter sub-module redundant control switching method, comprising the following steps:

[0060] S10: During normal operation of the modular multilevel converter, the sub-module 3 includes a running sub-module and a redundant sub-module, and monitors the voltage value Uc at both ends of the supporting capacitor C of the redundant sub-module;

[0061] S20: When the voltage Uc across the support capacitor C of the redundant sub-module of a certain phase arm 2 is greater than or equal to the first preset value Uc1 and less than or equal to the second preset value Uc2, enter step S30;

[0062] S30: the first switching tube T1 of the redundant sub-module is turned off, the second switching tube T2 is turned on, and the redundant sub-module is in a cut-out state;

[0063] S21: when the voltage Uc across the support capacitor C of the redundant sub-module is less than the first preset value Uc1, enter step S31;

[0064] S31: ...

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Abstract

The invention discloses a control and switch method for redundant submodules of a modular multilevel converter. The converter monitors a voltage value of a redundant submodule support capacitor in the normal running process. When voltage of two ends of the redundant submodule support capacitor of a phase of bridge arm is larger than or equal to a first preset value and smaller than or equal to a second preset value, the redundant submodules are in a switch-out state; when the voltage of two ends of the redundant submodule support capacitor is smaller than the first preset value, the on-off states of a first switch tube and a second switch tube are determined according to a modulation mode and a submodule direct voltage balance control strategy; and till the voltage of two ends of the redundant submodule support capacitor is equal to the second preset value, the second switch tube is connected for afterflow, otherwise, a message of a overvoltage fault of the redundant submodules is sent, so that the protection action is executed. According to the control and switch method, the redundant submodules can be connected to bridge arms at the highest speed to replace fault submodules, so that the stability of voltage of the direct current side of the converter is maintained, the balance in voltage between capacitors of the submodules of the upper bridge arm and the lower bridge arm is kept, the reliability is improved, and the availability ratio is increased.

Description

technical field [0001] The present invention relates to a control method of a converter, in particular to a method for redundant control switching of a modular multilevel converter submodule (Submodule) applied in the technical field of flexible direct current transmission. Background technique [0002] Flexible DC transmission technology is a new type of high-voltage DC transmission technology based on voltage source converters. With its no commutation failure problem, it can realize fast decoupling control of active and reactive power and the advantages of low harmonic content. It is more widely used in the fields of distributed generation grid connection, asynchronous interconnection of AC system, multi-terminal DC transmission and capacity expansion of urban distribution network. [0003] Modular multilevel converter, as one of the voltage source converter topologies to realize flexible DC transmission engineering, has received great attention in recent years. The schem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J9/06
Inventor 敬华兵吴强龚芬唐剑钊邓明毕金融秦灿华
Owner ZHUZHOU NAT ENG RES CENT OF CONVERTERS
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