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A fault ride-through method for low-loss modular multilevel DC-DC converters

A modular multi-level, DC-DC conversion technology, applied in the direction of converting DC power input to DC power output, adjusting electrical variables, power transmission AC network, etc., to achieve fast isolation, high reliability, and fast power recovery. Effect

Active Publication Date: 2020-11-24
SHANGHAI JIAOTONG UNIV
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Problems solved by technology

[0007] However, the above-mentioned patents have the following disadvantages: in the normal operating state, the driving signals for each thyristor must be kept at the same time, and the voltage equalization of each thyristor must be guaranteed during operation, which puts forward higher requirements for the driving circuit and voltage equalizing circuit

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  • A fault ride-through method for low-loss modular multilevel DC-DC converters
  • A fault ride-through method for low-loss modular multilevel DC-DC converters
  • A fault ride-through method for low-loss modular multilevel DC-DC converters

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Embodiment Construction

[0034] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

[0035] figure 1 It is a structural diagram of a low-loss modular multilevel DC-DC converter in the method of an embodiment of the present invention. refer to figure 1As shown, the modular multilevel DC-DC converter in this embodiment includes three phase units, each phase unit is divided into three bridge arms, and the three bridge arms are connected in Y shape, and the non-common ends are respectively connected to the positive pole of the high-voltage side busbar , the positive pole of the low-v...

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Abstract

The invention provides a low-loss modular multilevel DC-DC converter fault ride-through method, wherein: the converter includes three phase units, each phase unit is divided into three bridge arms, and the low-voltage side bridge arm is composed of several series-connected Composed of sub-modules, the sub-module consists of two half-bridge structures, four capacitors and two freewheeling diodes, the first half-bridge includes the first switch module and the second switch module, and the second half-bridge includes the third switch module and the fourth switch module; the negative pole of the first switch module is connected to the positive pole of the second switch module, the negative pole of the second switch module is connected to the positive pole of the third switch module, and the negative pole of the third switch module is connected to the positive pole of the fourth switch module ; In the DC transmission system, when a bipolar short-circuit fault occurs on the high-voltage or low-voltage side, all full-control switches are turned off, and the current is forced to flow through the freewheeling diode and through the capacitor to realize fault blocking. The invention can realize the fault blocking of the short circuit on the direct current side without increasing the loss at the same time.

Description

technical field [0001] The invention relates to the technical field of power transmission and distribution in power systems, in particular to a fault ride-through method for a low-loss modular multilevel DC-DC converter with fault blocking capability. Background technique [0002] With the increase of renewable energy power generation, the integration of renewable energy into the grid has become a very important research direction at present. [0003] The flexible direct current transmission technology provides a solution to solve the grid connection of renewable energy, and has strong technical advantages. After obtaining the DC voltage, the conversion of the voltage level can be completed through the DC-DC converter. Each sub-module of the modular multilevel DC-DC converter has a relatively simple structure and is easy to control, and it is particularly suitable for the field of high-voltage direct current transmission due to the characteristics of modularization and easy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158H02M1/32H02J3/36H02H7/26
CPCH02H7/268H02J3/36H02M1/32H02M3/158H02M1/0054H02M1/325Y02B70/10Y02E60/60
Inventor 彭程李睿蔡旭
Owner SHANGHAI JIAOTONG UNIV
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