Modularized multi-level converter sub-module control and protection method

A modular multi-level, control and protection technology, used in power transmission AC networks, emergency protection circuit devices, conversion of AC power input to DC power output, etc. Fast speed, easy to upgrade, and the effect of reducing the pressure on software and hardware

Active Publication Date: 2011-07-06
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the two-level converter topology that has been widely used, due to the relatively high voltage and power levels in DC transmission, a single IGBT device is far from meeting the withstand voltage requirements, so it is necessary to connect IGBTs in series to form a valve body to increase the withstand voltage
However, due to the different characteristics of each device, the reliability of the valve body composed of IGBTs in series has become the focus and problem to be solved in this topology.

Method used

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  • Modularized multi-level converter sub-module control and protection method
  • Modularized multi-level converter sub-module control and protection method
  • Modularized multi-level converter sub-module control and protection method

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Embodiment Construction

[0038] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0039] figure 1 It is a structural block diagram of a modular multilevel converter (MMC) and its sub-modules. The modular multilevel converter is composed of three-phase six bridge arms, and each phase has two upper and lower bridge arms. , the structure of each upper and lower bridge arm is the same, and it is composed of several sub-modules cascaded; each sub-module includes two upper and lower fully-controlled power electronic devices IGBT1 and IGBT2, an energy storage capacitor C and a thyristor V for over-current protection. At the same time, there is also a vacuum switch that can bypass the sub-module from the main circuit by closing it when a serious failure occurs in the sub-module; by controlling the on-off of the internal IGBT of each sub-module, the output capacitor voltage (input) of the sub-module can be con...

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Abstract

The invention relates to a modularized multi-level converter sub-module control and protection method. The control and protection method comprises the following processing modes: in four control models of a sub-module, executing different control and protection logics by using a sub-module controller; generating a sub-module internal interface output signal, detecting an input signal and diagnosing a plurality of faults; executing control and protection actions by using the sub-module controller according to an action priority level; detecting the voltage of an energy storage capacitor C by using the sub-module controller; and performing asynchronous serial communication between the sub-module controller and a valve-based controller. In the method, a complete and intelligent control and protection scheme is designed aiming at the structure of the modularized multi-level converter sub-module, the coordinated control and protection of the overall sub-module can be realized, so that the stable and reliable operation of the sub-module in a converter and the coordinated matching with an overall control and protection system of the converter are ensured.

Description

technical field [0001] The invention relates to a control technology of a flexible direct current transmission converter, in particular to a control and protection method for a modular multilevel converter (Modular Multilevel Coverter, MMC) sub-module. Background technique [0002] At present, various power electronic circuits based on the fully-controlled power electronic device IGBT have been increasingly used in power systems, locomotive traction, aerospace and other fields. With the development of power electronics technology, materials, and manufacturing processes, the current flow capacity of IGBT devices has become stronger and stronger, making it an important space to play in the field of DC power transmission, which directly promotes the birth and development of flexible DC power transmission technology. Different from the traditional high-voltage direct current transmission technology, the flexible direct current transmission converter replaces the thyristor series...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/12H02M1/00
CPCY02E60/60H02J3/36H02M2007/4835H02M7/4835
Inventor 贺之渊国彬杨岳峰李超高阳
Owner CHINA ELECTRIC POWER RES INST
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