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Current source converter minimum DC ripple modulation method

A technology of DC ripple and modulation method, applied in the field of modulation, which can solve problems such as increased system switching loss, reduced system dynamic performance, and increased DC inductance value, to achieve the effects of increasing switching loss, optimizing performance, and extending system life

Active Publication Date: 2017-04-19
JIANGSU BEICHEN HUBANG ELECTRIC POWER CO LTD
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AI Technical Summary

Problems solved by technology

There are two traditional ways to suppress DC ripple: one is to increase the value of DC inductance, which will lead to a decrease in the dynamic performance of the system and an increase in cost and volume; the other is to increase the switching frequency, which will lead to system The rise of switching losses
Both of these traditional methods have significant limitations

Method used

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  • Current source converter minimum DC ripple modulation method
  • Current source converter minimum DC ripple modulation method
  • Current source converter minimum DC ripple modulation method

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Embodiment Construction

[0051] 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.

[0052] Such as Figure 4 As shown, the minimum DC ripple modulation method of the current source converter of the present invention includes the following steps:

[0053] 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 .

[0054] Step 2: Define ripple |△I| and carrier period T...

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Abstract

The invention discloses a current source converter minimum DC ripple modulation method. The method comprises the following steps: various parameters such as the converter AC voltage amplitude Vtm, the converter AC A-phase voltage initial phase gamma, the modulation ratio m and the reference current angular displacement initial value theta0 of the system are calculated. Through selecting the most proper modulation mode, the DC ripple reaches the minimum, the performance of the converter is optimized, and the service life of the system is prolonged. Compared with the traditional ripple suppression method, the new method does not need to increase the DC inductance nor the switching loss, the method only needs to improve the modulation algorithm of the converter, and great superiority exists; the limitation of a converter AC-side power factor angle does not exist, the problem of time point switching does not exist, the application range is wider, and the realization is simpler.

Description

technical field [0001] The invention relates to a modulation method, in particular to a minimum DC ripple modulation method of 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 is caused by the periodic charging and discharging of the DC inductor, and too large a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/14
Inventor 张建文蔡旭李沛元
Owner JIANGSU BEICHEN HUBANG ELECTRIC POWER CO LTD
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