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Two-stage nine-level inverter based on bridge type multi-level switched capacitor module

A switched capacitor and multi-level technology, applied in the direction of adjusting electrical variables, instruments, electrical components, etc., can solve problems such as difficulty in improving inverter efficiency, limited voltage lifting capability, and low power density, so as to optimize the output waveform quality and realize Effect of voltage balance and utilization improvement

Active Publication Date: 2018-09-21
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the disadvantages of traditional inverters such as high cost, large volume, low power density, limited voltage rise capability, and difficulty in improving inverter efficiency, people have turned their attention to switched capacitor inverters.

Method used

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  • Two-stage nine-level inverter based on bridge type multi-level switched capacitor module
  • Two-stage nine-level inverter based on bridge type multi-level switched capacitor module
  • Two-stage nine-level inverter based on bridge type multi-level switched capacitor module

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0034] refer to figure 1 , it can be seen from the figure that the inverter can be divided into two parts: a bridge multilevel switched capacitor module 1 and an inverter module 2 .

[0035] The bridge multilevel switched capacitor module 1 includes an H bridge and a basic switched capacitor module; wherein the H bridge consists of four full-control devices MOSFET switch tubes S 1 , S 2 , S 3 , S 4 composition; the basic switched capacitor module includes a first capacitor C connected in series 1a and a second capacitor C 1b , the third capacitor C connected in series 2a and the fourth capacitor C 2b , and four full-control device MOSFET switches S 1a , S 1b , S 2a , S 2b .

[0036] where S 1 The drain, S 3 The drain, S 1a connected to the source; S 1 source, S 2 The drain, C 2a negative electrode, C 2b connected to the positive pole;...

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Abstract

The invention discloses a two-stage nine-level inverter based on a bridge type multi-level switched capacitor module. The bridge type multi-level switched capacitor module is applied to a DC-DC converter link, so that a voltage of which the peak is 4 times of that of an input voltage is output, high-efficiency and high power density of a boost link are ensured, and the problem of bus-bar voltage imbalance existing during multi-level inversion is solved; bilateral switch asymmetrical H bridges are applied to a DC-AC converter link, an unequal carrier stacked PWM (Pulse-Width Modulation) controlstrategy is combined, nine-level AC output is realized, the DC bus-bar voltage utilization rate is improved, and the output waveform quality is optimized.

Description

technical field [0001] The invention relates to a two-stage nine-level inverter based on a bridge-type multi-level switched capacitor module. Background technique [0002] With the depletion of conventional energy sources such as coal, oil, and natural gas, a variety of sustainable and clean energy sources such as solar energy, wind energy, and biomass energy have become research hotspots as their substitutes. Among them, solar energy is recognized as the most ideal sustainable and green energy source because of its advantages such as abundant reserves, no noise, and no pollution. The power conversion device is a core component in the photovoltaic power generation system. In photovoltaic grid-connected applications, grid-connected inverters are usually used to transfer power from photovoltaic cells to the grid. [0003] As the main equipment of the photovoltaic array and grid interface, the inverter's performance determines the performance of the entire photovoltaic power ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02M7/501H02M7/5388H02M7/5395H02M3/158
CPCH02M3/158H02M7/483H02M7/501H02M7/5388H02M7/5395H02M1/007H02M7/4835
Inventor 何良宗孙嘉清程琛
Owner XIAMEN UNIV
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