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Multilevel inverter based on bridge modular switched capacitor

A modular multi-level, multi-level inverter technology, applied in electrical components, output power conversion devices, AC power input to DC power output, etc., can solve the problem of narrow DC voltage variation range of distributed power sources Problems such as low efficiency and limited voltage boosting capability achieve the effect of reducing the number of switch tubes, increasing voltage gain and power density, and reducing system loss

Active Publication Date: 2015-07-01
XIAMEN UNIV
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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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  • Multilevel inverter based on bridge modular switched capacitor
  • Multilevel inverter based on bridge modular switched capacitor
  • Multilevel inverter based on bridge modular switched capacitor

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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 multilevel inverter based on a bridge modular switched capacitor. The multilevel inverter comprises a bridge modular multilevel switched capacitor module and an inverting module. During running of a system, the bridge modular multilevel switched capacitor module performs a conversion process of output voltage U, 2U, 4U and U through DC-DC conversion and performs DC-AC conversion through the inverting module. The multilevel inverter allows DC-DC conversion to be performed under high efficiency, high power density and high-voltage conversion ratio, a unipolar multi-frequency SPWM (sinusoidal PWM) method in the DC-AC conversion is optimized, the number of switch tubes is less than that of the traditional multilevel inverter module, and high-quality output waveform and low-harmonic content are achieved.

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 Applications(China)
IPC IPC(8): H02M7/483
CPCH02M7/483H02M7/4835
Inventor 何良宗程琛
Owner XIAMEN UNIV
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