Control method, system and storage medium of multi-module direct parallel converter

A control method and converter technology, applied in the field of electric power, can solve the problems of increasing power loss, voltage difference, and inability to eliminate high-frequency harmonics, etc., and achieve the effect of reducing high-frequency harmonics and increasing active power

Active Publication Date: 2021-06-08
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Due to certain differences in the impedance between the various converter modules, etc., there will be a voltage difference between the modules, which will cause a circulating current between the modules
The existence of circulating current will increase the power loss, which needs to be eliminated. Usually, it is closed-loop controlled by a control algorithm, but this kind of method only has a certain effect on low-frequency harmonics, and cannot eliminate high-frequency harmonics near the switching frequency in circulating current. , and there is a certain coupling between the suppression effect and the system parameters, when the system parameters change and reach a certain critical value, it may also cause oscillation between the low frequency and high frequency of the system

Method used

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  • Control method, system and storage medium of multi-module direct parallel converter
  • Control method, system and storage medium of multi-module direct parallel converter
  • Control method, system and storage medium of multi-module direct parallel converter

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Embodiment Construction

[0048] The core of the present invention is to provide a control method for a multi-module direct-parallel converter, in which the high-frequency harmonics near the switching frequency can be reduced, and the system output can be greatly improved. active power.

[0049] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. 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.

[0050] Please refer to figure 1 , figure 1 It is an implementation flowchart of a control method for a multi-module direct parallel converter in t...

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Abstract

The invention discloses a control method of a multi-module direct parallel converter, comprising: determining the product of the number of converter modules connected in parallel on the AC winding of the transformer and the current phase number of a single converter module; combining 360° with the product The quotient of is determined as the target angle; the carrier waves of each phase loaded on each converter module are staggered so that the phases of the carrier waves of each phase are sequentially different from the target angle. Applying the control method of the multi-module directly parallel-connected converter provided by the present invention can reduce the high-frequency harmonics near the switching frequency in the multi-module direct-parallel converter, and greatly increase the active power output by the system. The invention also provides a control system and a computer-readable storage medium of a multi-module direct parallel converter, which have corresponding technical effects.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a control method, a system and a storage medium of a multi-module directly paralleled converter. Background technique [0002] With the continuous development of society and technology, in many occasions such as electric vehicle drive system, distributed power generation, electric drive system, etc., the demand for the quality and capacity of electric automation equipment is increasing day by day. Improving the output performance of the converter is the key One of the important research directions. [0003] Limited by the capacity of power devices, the converter usually includes multiple converter modules, and these converter modules are connected in parallel to the transformer. Multiple converter modules have the advantages of increasing the output power level of the system, improving the reliability of the system, and increasing the flexibility of the system. [0004]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/12
CPCH02M1/12
Inventor 黄超梅文庆文宇良张志学罗文广彭赟苏亮亮孙璐陈志博胡景瑜付刚王跃吴奕
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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