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Optimal DC Ripple Hybrid Modulation Method for Current Source Converter

A technology of DC ripple and modulation method, applied in the field of modulation, can solve the problems of affecting the output waveform, increasing the heating and stress of the DC element, reducing the life of the AC filter, etc., to achieve great advantages and increase the effect of switching loss

Active Publication Date: 2019-08-23
上海中绿新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The DC ripple current of the current source converter has a great influence on the performance of the converter: first, excessive DC ripple will cause the heating and stress of the DC components to increase, and affect the life of the DC inductor and switching devices; Second, this will increase the harmonic content in the DC waveform and AC waveform and affect the output waveform; third, too large a DC ripple will also reduce the life of the AC filter, especially the filter capacitor

Method used

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  • Optimal DC Ripple Hybrid Modulation Method for Current Source Converter
  • Optimal DC Ripple Hybrid Modulation Method for Current Source Converter
  • Optimal DC Ripple Hybrid Modulation Method for Current Source Converter

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Embodiment Construction

[0045] 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.

[0046] Such as Figure 4 As shown, the optimal DC ripple hybrid modulation method of the current source converter of the present invention includes the following steps:

[0047] Step 1: Calculate various parameters of the system, including the AC voltage amplitude V of the converter tm , the initial phase γ of the AC phase A voltage of the converter, the modulation ratio m, and the initial value of the reference current angular displacement θ 0 .

[0048] Step 2: Define ripple |△I| and carrier ...

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Abstract

The invention discloses an optimal DC ripple wave mixed type modulation method of a current source type converter. The optimal DC ripple wave mixed type modulation method of the current source type converter comprises the step of calculating various parameters of a system, wherein the parameters include an AC voltage amplitude Vtm of the converter, an initial phase gamma of an AC A-phase voltage of the converter, a modulation ratio m, an angular displacement initial value theta0 of the reference current and the like. In comparison with a separate five-stage type modulation way, the switch loss of the system is basically in accordance, but the peak value and effective value of the ripple wave are minimized; in comparison with the traditional ripple wave suppression technology, only the modulation algorithm of the converter rather than increase of DC inductance and obvious increase of switch loss is needed by the new technology, and great superiority is obtained.

Description

technical field [0001] The invention relates to a modulation method, in particular to an optimal DC ripple hybrid modulation method for a current source converter. Background technique [0002] Current source converters have many excellent characteristics, including natural short-circuit protection capability, flexible and adjustable power factor, high reliability, etc., so they are widely used in motor drive, new energy grid connection and other fields. With the rise of new anti-resistance devices such as RB-IGBT, the switching frequency of the current source converter can be greatly increased, so that its DC inductance, AC inductance, and AC capacitance can be greatly reduced, which means faster dynamic Responsive, less cost and smaller size. In this context, the application prospect of the current source converter will be broader. [0003] The DC ripple current of the current source converter has a great influence on the performance of the converter: first, excessive DC...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/14
CPCH02M1/14
Inventor 蔡旭张建文李沛元
Owner 上海中绿新能源科技有限公司
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