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A low modulation ratio pulse output method for five-phase three-level inverters

A technology of three-level inverter and low modulation ratio, which is applied in the direction of converting AC power input to DC power output, output power conversion device, electrical components, etc., and can solve problems such as phase voltage distortion

Active Publication Date: 2017-01-11
中国船舶重工集团公司第七一二研究所
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Problems solved by technology

[0004] The present invention mainly solves the technical problems existing in the prior art; it provides an inverter that can solve the problem of output phase voltage distortion under low modulation ratio of this type of frequency converter, and is suitable for high-power industrial electric transmission, rail transit and ship electric propulsion. A low modulation ratio pulse output method for five-phase three-level inverter

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  • A low modulation ratio pulse output method for five-phase three-level inverters
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  • A low modulation ratio pulse output method for five-phase three-level inverters

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Embodiment

[0038] The technical solutions of the present invention will be further specifically described below through the embodiments and in conjunction with the accompanying drawings. The invention takes a five-phase three-level full-bridge inverter as an example to study a low modulation ratio pulse output method of a three-level frequency converter.

[0039] 1. Five-phase three-level inverter SVPWM modulation vector distribution and specific vector selection.

[0040] The topology of the five-phase three-level full-bridge inverter is as follows: figure 1 As shown, the output voltage of each phase has three switching states (1, 0, -1), using the switching function S j (j=A, B, C, D, E) means that the five-phase composite voltage vector can be expressed as:

[0041] U = 2 5 ( v A O + v B O ...

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Abstract

The invention belongs to the fields of large-power industrial electrical transmission, rail transit and ship electric propulsion and particularly relates to a low modulation ratio pulse output method for a five-phase three-level frequency converter. Due to the fact the connecting time of an upper pipe and a lower pipe of the frequency converter is reasonably prolonged, the minimum connecting time of the device is larger than the minimum pulse width limiting time. Meanwhile, it is ensured that the output phase voltage of the frequency converter is not changed, and the midpoint potential balance of the frequency converter is not influenced. The purpose that the frequency converter normally outputs the phase voltage under the low modulation ratio is achieved. According to the low modulation ratio pulse output method for the five-phase three-level frequency converter, the problem that the output phase voltage is distorted under the low modulation ratio of the frequency converter can be solved, and the method is suitable for the fields of large-power industrial electrical transmission, rail transit, ship electric propulsion and the like.

Description

technical field [0001] The invention belongs to the fields of high-power industrial electric transmission, rail transit and ship electric propulsion, and in particular relates to a low modulation ratio pulse output method for a five-phase three-level frequency converter. Background technique [0002] With the rapid development of ship electric propulsion technology, the power level requirements of ship electric propulsion devices are getting higher and higher. Three-level inverters are more suitable for use in ship electric propulsion systems due to their advantages such as low EMI and high power. application. [0003] When the three-level inverter works with a low modulation ratio, due to the minimum pulse width requirement of the power device, the output phase voltage of the inverter is seriously distorted under the low modulation ratio, which restricts the application of the inverter to the ship electric propulsion system with low speed requirements. Therefore, there is ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483
Inventor 胡传西方华松李洁夏云非王治国
Owner 中国船舶重工集团公司第七一二研究所
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