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Multilevel converter system

A converter, multi-level technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the problem of increasing system cost, increasing system complexity, AC converter flexibility and Stability requirements are harsh and other issues to achieve the effect of reducing total harmonic distortion and improving quality

Pending Publication Date: 2017-08-11
FOSHAN UNIVERSITY
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  • Application Information

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Problems solved by technology

[0002] With the large-capacity, new energy, and special environment power conversion technologies, especially the popular power electronic transformers, sinusoidal AC voltage regulators, AC choppers, and flexible AC transmission system (FACTS) controllers, etc. The flexibility and stability requirements of the converter are becoming more and more stringent. When the traditional multi-level converter requires to output more voltage levels, more power devices are often used for control, which increases the complexity of the system and improves the system efficiency. cost

Method used

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  • Multilevel converter system
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Embodiment 1

[0023] Embodiment 1, reference figure 1 , a multilevel converter system, comprising: a control logic system and a multilevel converter topology.

[0024] The control logic system includes: a waveform generating unit for outputting a fundamental wave and a modulated wave, a logic processor for receiving the fundamental wave and the modulated wave and comparing the fundamental wave and the modulated wave to output a control signal, The control signals are used to control the bridge cells of the multilevel converter topology.

[0025] The waveform generation unit includes: U, V, and W phase sine wave generators a1, a2, and a3 for outputting first, second, and third fundamental waves, and for outputting first, second, third, and third fundamental waves Triangular wave generator for four modulated waves. The first basic wave is a U-phase sine wave, the second basic wave is a V-phase sine wave, and the third basic wave is a W-phase sine wave. The triangular wave generator includes...

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Abstract

The invention discloses a multilevel converter system which comprises a control logic system and a multilevel converter topology. The system utilizes the compounding comparison of a basic wave and a modulating wave and converts a comparison result into a control signal; the control signal is used for controlling the multilevel converter topology, so that the multilevel converter system has 9 wire level outputs; the 9 levels are utilized to approach to sinusoidal waveform; the total harmonic distortion can be effectively reduced and the quality of the output waveform is increased.

Description

technical field [0001] The invention relates to the technical field of electric energy conversion, in particular to a multilevel converter system. Background technique [0002] With the large-capacity, new energy, and special environment power conversion technologies, especially the popular power electronic transformers, sinusoidal AC voltage regulators, AC choppers, and flexible AC transmission system (FACTS) controllers, etc. The flexibility and stability requirements of the converter are becoming more and more stringent. When the traditional multi-level converter requires to output more voltage levels, more power devices are often used for control, which increases the complexity of the system and improves the system efficiency. cost. [0003] Therefore, how to use fewer power devices to obtain a multilevel converter that outputs more voltage levels has always been a research direction in the industry. Contents of the invention [0004] In order to solve the above prob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02M7/539
CPCH02M7/483H02M7/539
Inventor 李湘峰屈莉莉张波
Owner FOSHAN UNIVERSITY