A loss optimization control method for modular multilevel converter under fault-tolerant control

A modular multi-level, fault-tolerant control technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., to achieve the effect of easy construction cost and strong practicability

Active Publication Date: 2022-02-01
SOUTHEAST UNIV
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Problems solved by technology

Compared with conventional methods, there is no need to increase the construction cost of modular multilevel converters

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  • A loss optimization control method for modular multilevel converter under fault-tolerant control
  • A loss optimization control method for modular multilevel converter under fault-tolerant control
  • A loss optimization control method for modular multilevel converter under fault-tolerant control

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[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0039] Aiming at the loss optimization problem of modular multilevel converters under sub-module faults, the present invention proposes a loss optimization control method for modular multilevel converters under fault-tolerant control, wherein the three-phase modular multilevel converters and the topology of submodules such as figure 1 , figure 2 As shown, the three-phase modular multilevel converter consists of six bridge arms, and each bridge arm contains N (N i...

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Abstract

The invention discloses a method for optimizing the loss of a modular multilevel converter under fault-tolerant control, which includes the following steps: S1. When a submodule fault occurs in any bridge arm of the modular multilevel converter during normal operation, the fault is removed The fault sub-module in the bridge arm realizes fault-tolerant control; S2, suppresses the base frequency circulation current through the base frequency circulation controller; S3, uses the loss expressions of different switching tubes of the modular multilevel converter sub-module to calculate the fault bridge respectively The loss of each sub-module in the normal bridge arm and the normal bridge arm; S4. For the unbalanced loss between the bridge arms of the modular multilevel converter, the normal bridge arm sub-module loss is used as a reference value, and the capacitance voltage of the faulty bridge arm is adjusted to sort The control cycle realizes the loss control of the remaining sub-modules of the faulty bridge arm, and finally realizes the loss balance of each sub-module of the faulty bridge arm and the normal bridge arm. Compared with the conventional method, the invention does not need to increase the construction cost of the modularized multilevel converter.

Description

technical field [0001] The invention belongs to the field of multilevel power electronic converters, and in particular relates to a loss optimization control method for modular multilevel converters under fault-tolerant control. Background technique [0002] Modular Multilevel Converter (MMC) adopts a modular structure, because of its high reliability, good output characteristics, flexible structure adjustment and redundant control, etc. Fields such as renewable energy grid connection and motor drive have attracted wide attention. [0003] Since the modular multilevel converter contains a large number of sub-modules, each sub-module may fail. After removing the faulty sub-module and realizing the fault-tolerant control, because the number of sub-modules of the faulty bridge arm is not equal to that of the normal bridge arm, there is an imbalance among the six bridge arms of the three-phase modular multilevel converter. Among them, the loss of the remaining sub-modules of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387H02M1/088H02M1/32
CPCH02M7/53871H02M1/088H02M1/32Y02E60/60H02M1/0048H02M1/325H02M7/4835H02M1/0054H02M7/4833H02M7/4837H02M1/0012H02M1/0051
Inventor 邓富金王梦悦赵纪峰
Owner SOUTHEAST UNIV
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