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A Multilevel Inverter Based on Bridge Modular Switched Capacitors

A modular multi-level, multi-level inverter technology, applied in electrical components, output power conversion devices, AC power input conversion to DC power output, etc., can solve the problem of low efficiency, limited voltage lifting capacity, Distributed power supply DC voltage variation range is narrow and other issues, to achieve the effect of increasing voltage gain and power density, reducing system loss, and reducing the number of switch tubes

Active Publication Date: 2017-07-18
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the limited voltage raising capability of the Boost circuit, the DC voltage range of the distributed power source that the grid-connected inverter can accept is generally relatively narrow. At the same time, the efficiency of the traditional boost type inductive converter is generally not high.

Method used

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  • A Multilevel Inverter Based on Bridge Modular Switched Capacitors
  • A Multilevel Inverter Based on Bridge Modular Switched Capacitors
  • A Multilevel Inverter Based on Bridge Modular Switched Capacitors

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with drawings and embodiments.

[0027] The present invention will be further elaborated below in conjunction with the accompanying drawings and embodiments.

[0028] refer to figure 1 , it can be seen from the figure that the inverter can be divided into two parts: a bridge-type modular multi-level switched capacitor module and an inverter module.

[0029] Wherein, the bridge-type modular multi-level switched capacitor module includes an H-bridge and a basic switched capacitor module; wherein the H-bridge is composed of four full-control device MOSFET switch tubes, which are respectively the first high-frequency switch S 1 , the second high frequency switch S 2 , the third high frequency switch S 3 , the fourth high frequency switch S 4 ; The basic switched capacitor module includes a first capacitor network and a second capacitor network, and four full-control device MOSFET switch tubes; the firs...

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Abstract

The invention provides a multi-level inverter based on a bridge-type modular switched capacitor, which includes two parts: a bridge-type modularized multi-level switched capacitor module and an inverter module; The DC-DC conversion of the multi-level switched capacitor module realizes the conversion process of the output voltage Ui→2Ui→4Ui→2Ui→Ui, and then realizes the DC-AC conversion through the inverter module. The invention provides a multi-level inverter based on a novel bridge-type modular switched capacitor, which realizes high efficiency, high power density and high voltage ratio operation of the DC-DC conversion link, and the innovation of the DC-AC conversion link The unipolar frequency doubling SPWM method is optimized, which effectively reduces the number of switch tubes compared with the traditional multi-level inverter module, and at the same time realizes high-quality output waveform and low harmonic content.

Description

technical field [0001] The invention relates to a multi-level inverter based on a novel bridge-type modular switched capacitor. Background technique [0002] Energy is an important material basis for the survival and development of human society. In recent years, the limitation of the world's fossil energy and the environmental pollution caused by the process of development and utilization have become increasingly prominent, and have become the main bottleneck restricting the sustainable development of the world economy. The development and utilization of clean renewable energy has been highly valued by countries all over the world. Photovoltaic grid-connected power generation, as one of the main forms of utilization of solar energy, has attracted people's attention. [0003] With the increasing maturity of technology, in view of the problems of poor reliability, low efficiency, and poor scalability of traditional centralized photovoltaic grid-connected systems, people have...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483
CPCH02M7/483H02M7/4835
Inventor 何良宗程琛
Owner XIAMEN UNIV