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Modular multi-level converter sub-module voltage sorting method

A modular multi-level, sub-module voltage technology, applied in the field of power systems, can solve problems such as rising costs, long sequencing time, and complex product development processes

Inactive Publication Date: 2014-03-26
CHINA XD ELECTRIC CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the existing modular multi-level converters, single-chip microcomputer or DSP is mostly used to process the voltage data of these multiple sub-modules, but the sorting takes a long time; or a high-speed CPU is used, but the cost will increase , the product development process is complex and difficult to achieve

Method used

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  • Modular multi-level converter sub-module voltage sorting method
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  • Modular multi-level converter sub-module voltage sorting method

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Embodiment Construction

[0022] The present invention is described in detail below in conjunction with accompanying drawing and specific embodiment:

[0023] Such as figure 2 , the core of the method of the present invention is the cascaded N comparing and exchanging units. The logic in each compare swap unit is as follows.

[0024] 1 When the voltage data enters the comparison and exchange unit for the first time, the comparison and exchange unit saves the data in the tmp register. When subsequent data comes, the comparison and exchange unit compares it with the data in the tmp register. If the data in the tmp register is larger (smaller), the current data is directly output to the next-level unit. If it is smaller (larger) than the data in the tmp register, the data in the tmp register is output to the next-level unit, and the current data is assigned to tmp register.

[0025] 2 According to the above logic, the smallest (largest) number that passes through the unit is left in each comparison an...

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Abstract

The invention discloses a modular multi-level converter sub-module voltage sorting method. The method includes: using a programmable logic device to collect the voltage data of each sub-module, and setting N cascaded comparison and exchange units in the programmable logic device; allowing the collected voltage to serially pass N comparison and exchange units, saving the data in a tmp register when the data enters the comparison and exchange units for the first time, and comparing the data subsequently entering the comparison and exchange units with the data in the tmp register; outputting the current data to next-level comparison and exchange units after comparison or saving the current data in the tmp register to achieve voltage sorting. Compared with traditional sorting methods, the method has the advantages that the N cascaded comparison and exchange units are used for parallel sorting, the time used by sorting the voltage of N modules is 2N clock cycles, the method is easy to understand and implement, fast in calculation, and satisfies the requirements of voltage sorting of a modular multi-level converter with increasing levels.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a method for sorting voltages of sub-modules of a modular multilevel converter. Background technique [0002] The power transmission technology based on the voltage source converter is a new type of direct current transmission technology, which has many advantages compared with the traditional direct current transmission. Modular multilevel converter is a new type of voltage source converter developed in recent years. It has many advantages such as small harmonics and low loss. [0003] Such as figure 1 It is a schematic diagram of the principle of one phase of a modular multilevel converter. There are module 1 to module N on each bridge arm, a total of N sub-modules. The control device determines several sub-modules to be turned on or off on the upper and lower bridge arms according to the AC voltage command, so as to generate a suitable AC voltage. Moreover, the contr...

Claims

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Application Information

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IPC IPC(8): G06F19/00G06F17/30
Inventor 冯武彤王小强胡鑫明廖红伟
Owner CHINA XD ELECTRIC CO LTD
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