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Modular multilevel converter and control method thereof

A modular multi-level, converter technology, applied in high-efficiency power electronic conversion, conversion of AC power input to DC power output, electrical components, etc., can solve the problem of increasing the conduction loss of the converter, increasing the transmission cost, and reducing the converter. Conversion efficiency and other issues, to achieve the effect of improving conversion efficiency and reducing conduction loss

Pending Publication Date: 2020-11-13
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the half-bridge sub-module, the full-bridge sub-module increases the conduction loss of the converter, reduces the conversion efficiency of the converter, and increases the transmission cost of the system.

Method used

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  • Modular multilevel converter and control method thereof
  • Modular multilevel converter and control method thereof
  • Modular multilevel converter and control method thereof

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Embodiment Construction

[0045] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0046] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0047] The present invention provides a modular multilevel converter, such as figure 1 As shown, the modular multilevel converter is composed of three branches connected in parallel, a...

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Abstract

The invention relates to a modular multilevel converter and a control method thereof, the modular multilevel converter is formed by connecting three branches in parallel, and each branch is formed byconnecting an upper bridge arm and a lower bridge arm in series; parallel connection points among the three branches are used for accessing a direct-current bus; the connection point of the upper bridge arm and the lower bridge arm in each branch is connected to an alternating current bus through an isolation transformer; each of the upper bridge arm and the lower bridge arm is formed by connecting a sub-module valve bank and an electric reactor in series, and each sub-module valve bank is formed by cascading a plurality of sub-modules with mechanical switches; according to the scheme of the invention, the conduction loss of the converter in a non-fault state is reduced, and the conversion efficiency of the converter is improved.

Description

technical field [0001] The invention relates to the technical field of DC power transmission and distribution, in particular to a modular multilevel converter and a control method thereof. Background technique [0002] The topology of the DC power grid is complex, the operating modes are diverse, the new energy access points are uncertain, and the input power fluctuates greatly. The determination of the control and protection configuration principles needs to consider multiple constraints; and the DC grid system itself has low operating inertia. The fault propagation speed is fast, which puts forward the rapidity requirement for the fault control and protection strategy, and puts forward the selectivity of the DC power grid fault protection. For the fault protection methods in the DC grid, there are currently two main solutions: power electronic converter blocking and DC circuit breaker switching. [0003] Modular multilevel converters based on chained module strings have t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02M7/5387H02M7/5395H02H7/122
CPCH02M7/483H02M7/53871H02M7/5395H02H7/1225H02M1/0054Y02B70/10
Inventor 曹远志杨波卢俊峰姚良忠王志冰
Owner CHINA ELECTRIC POWER RES INST