A protection system and protection method for a modular multilevel converter

A modularized multi-level, protection system technology, applied in overcurrent protection, emergency protection circuit devices, electrical components, etc. It has the problems of large degree, no bridge arm current detection and bridge arm overcurrent protection functions, etc., to reduce the misoperation of overcurrent protection, protect reliability and safety.

Active Publication Date: 2011-12-28
CHINA ELECTRIC POWER RES INST +1
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AI Technical Summary

Benefits of technology

In this new design method described in the previous figure, it allows multiple modules (sub elements) inside an MMC flexDC power distribution network to be protected from current surges without causing any harm or even failure during certain times due to excessive currents flowing through them. It also includes partial protection modes that reduce potential errors while still allowing some components to function properly when they should have their ability to handle more loadings than usual. Overall, these technical improvements improve the performance and efficiency of the overall ACM system.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving flexibility in voltage direct transfer (FDC) systems that use modules called MMC's or Multiplexed Multilevel Converts/I GB Tables (MCI). These types of converters contain many components such as transistors, inductive elements, resistances, etc., which makes them difficult to detect when there may become too much damage due to excessively heavy currents flowing through their circuits. Overall, these issues make traditional methods like circuit breaker protection less effective than desired because they require higher levels of redundancy compared to other techniques.

Method used

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  • A protection system and protection method for a modular multilevel converter
  • A protection system and protection method for a modular multilevel converter
  • A protection system and protection method for a modular multilevel converter

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Embodiment Construction

[0043] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0044] Due to the characteristics of the modular multi-level flexible DC transmission system, in the event of a DC bipolar short circuit in the system, the bridge arm is required to enter the locked state within 1.5ms, otherwise the IGBT and other devices inside the sub-module will be damaged. Subtracting the time for bridge arm current acquisition and transmission in the form of data encoding is 0.2ms, the execution time of the sub-module and the necessary reliable measurement time are 0.5ms, the controller must complete the sampling filter and make a fault judgment within 0.8ms, and then Issue the blocking command to each sub-module on the bridge arm. In order to reduce the possible influence of overcurrent protection malfunction, the system is required to be protected through partial protection mode when a short-term bri

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Abstract

The present invention is a protection system and protection method for a modular multi-level converter. The converter includes 3-phase 6 bridge arms, and the bridge arms include reactors and sub-modules. The present invention is between the reactor and the power grid. Optical current transformers are set between them, and whether there is an overcurrent phenomenon is determined through monitoring. If there is an overcurrent phenomenon, whether to perform temporary global blocking or permanent global blocking. The invention realizes temporary blocking protection of the bridge arm within 1.5ms after the overcurrent fault of the bridge arm occurs. The bridge arm sub-module can quickly avoid the damage caused by the overcurrent fault. The present invention also completes further system tripping and outage protection actions after the bridge arm overcurrent is temporarily blocked for 10 ms, thereby protecting the reliability and safety of the modularized multi-level in the flexible direct current transmission system.

Description

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Claims

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Application Information

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Owner CHINA ELECTRIC POWER RES INST
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