New Design Method of DC Inductor of Current Source Converter

A DC inductor, current source type technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve problems such as rough, high cost, poor dynamic response speed, etc., to reduce Design value, design result accuracy, cost and volume reduction effect

Active Publication Date: 2019-09-03
上海中绿新能源科技有限公司
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The minimum value of the DC inductance should make the maximum ripple of the DC current meet the design requirements, but too large a DC inductance will result in high cost and poor dynamic response speed
The design method of the traditional current source converter DC inductance is relatively rough. Although it is also designed from the maximum ripple, they do not carefully analyze the change of the DC current ripple in a single sampling period, nor consider The influence of system parameters and modulation methods on DC ripple leads to a larger final design result, which is detrimental to the cost, volume and dynamic performance of the entire system

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  • New Design Method of DC Inductor of Current Source Converter
  • New Design Method of DC Inductor of Current Source Converter
  • New Design Method of DC Inductor of Current Source Converter

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Embodiment Construction

[0031] 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. These all belong to the protection scope of the present invention.

[0032] The modulation method adopted in the present invention is space vector modulation, and its principle is as follows: nine switching states of the current source converter can be corresponded to nine current vectors. Any Iref vector can be linearly combined by two adjacent non-zero vectors and a zero vector. And this Iref vector can be transformed into the corresponding three-phase fundamental wave current of the converter through 2s / 3s transformation. Therefore, by controlling the action ti...

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Abstract

The invention provides a novel design method for direct-current inductance of a current source converter. The method comprises the following steps: 1, calculating parameters of a system, comprising a converter alternating-voltage amplitude value Vtm, a converter alternating-current phase-A voltage initial phase gamma, a modulation ratio m and a reference current angular displacement initial value theta 0; 2, calculating the maximum value of a volt-second constant according to volt-second balance principles; 3, considering influences of different modulation methods for ripples, finding possible maximum volt-second constants, and taking the maximum value in the possible maximum volt-second constants as C; 4, calculating the direct-current inductance. The novel design method for the direct-current inductance of the current source converter disclosed by the invention overall considers influences of various factors, and design results are very accurate; compared with the traditional design method, the design value of the direct-current inductance can be greatly reduced under same design requirements of the direct-current current ripples to greatly reduce the cost and the size of the direct-current inductance.

Description

technical field [0001] The invention relates to a parameter design of a converter, in particular to a novel design method for a DC inductance of a current source converter. Background technique [0002] The current source converter is a PWM converter that uses reverse resistance switching devices and uses DC inductors as DC energy storage components. It has natural short-circuit protection capabilities and high reliability. It is used in wind power generation, motor drive and other fields have a wide range of applications. With the development and use of the new reverse-resistance switching device RB-IGBT, the switching frequency of the current source converter can be greatly increased, thereby improving its dynamic performance, reducing its size and cost, and its application prospects. will be wider. In this case, it is very necessary to study the design method of the DC inductance of the current source converter. [0003] The DC inductance of the current source converte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/00H02M7/00
Inventor 张建文蔡旭李沛元
Owner 上海中绿新能源科技有限公司
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