A Two-Stage Nine-Level Inverter Based on Bridge Multilevel Switched Capacitor Module

A switched capacitor, multi-level technology, applied in the direction of adjusting electrical variables, instruments, electrical components, etc., can solve the problems of difficult to improve inverter efficiency, limited voltage boost capability, low power density, etc., to optimize the output waveform quality, achieve The effect of voltage balance and improved utilization

Active Publication Date: 2019-10-22
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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  • A Two-Stage Nine-Level Inverter Based on Bridge Multilevel Switched Capacitor Module
  • A Two-Stage Nine-Level Inverter Based on Bridge Multilevel Switched Capacitor Module
  • A Two-Stage Nine-Level Inverter Based on Bridge Multilevel 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. Among them, the bridge-type multi-level switched capacitor module is applied in the DC-DC conversion link, which realizes the voltage output with a peak value of 4 times the input voltage, ensures the high efficiency and high power density of the boost link, and solves the problem of multi-level inverter The problem of unbalanced bus voltage exists; the DC-AC conversion link uses a bidirectional switch asymmetric H-bridge, combined with unequal-amplitude carrier layer PWM control strategy, realizes nine-level AC output, improves DC bus voltage utilization, and optimizes the quality of the output waveform.

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 Patents(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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