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A Three-level Self-Balanced Inverter Based on Bridge Switched Capacitor Module

A technology of capacitor module and bridge switch, which is applied in the field of three-level inverter topology and control strategy corresponding to three-level inverter, can solve the problem of reducing the inverter, etc., to eliminate low-frequency fluctuations and simplify complex degree, the effect of improving the quality

Active Publication Date: 2019-11-22
XIAMEN UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, it solves the problem of bus voltage balance, eliminates the low-frequency fluctuation of the midpoint potential, reduces the low-frequency harmonics output by the inverter, and improves the quality of the output waveform

Method used

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  • A Three-level Self-Balanced Inverter Based on Bridge Switched Capacitor Module
  • A Three-level Self-Balanced Inverter Based on Bridge Switched Capacitor Module
  • A Three-level Self-Balanced Inverter Based on Bridge Switched Capacitor Module

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Embodiment Construction

[0019] The present invention will be further elaborated below in conjunction with the accompanying drawings and embodiments.

[0020] refer to figure 1 is the topology diagram of the three-level self-balancing inverter based on the bridge switched capacitor module, which is mainly composed of figure 2 The bridge-type switched capacitor module is connected in parallel with the half-bridge inverter module composed of low-frequency full-control switch tubes S5 and S6 connected in series. Among them, the bridge-type switched capacitor module plays the role of step-up and capacitor voltage self-balancing.

[0021] The bridge-type switched capacitor module includes an H bridge and a basic switched capacitor module; wherein the H bridge consists of four high-frequency switching tubes S 1 , S 2 , S 3 , S 4 Composition; the basic switched capacitor module consists of a first capacitor C connected in series 1a and a second capacitor C 1b The first capacitor network consisting of...

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Abstract

The invention discloses a three-level self-balancing inverter based on a novel bridge type switched capacitor module. The inverter combines a switched capacitor boost module with a half-bridge inverter module to achieve an output with the amplitude of 4 times the input voltage. Self-balancing of the bus capacitor voltage is achieved by introducing a clamping capacitor in the switched capacitor boost module. Compared with the traditional three-level inverter, the above-mentioned inverter solves the imbalance problem of the bus voltage, and improves the quality of the output waveform and the stability of the inverter.

Description

technical field [0001] The invention relates to a three-level inverter based on a bridge-type switched capacitor module. In particular, it relates to the three-level inverter topology and the corresponding control strategy of the three-level inverter. Background technique [0002] To improve the current situation of my country's energy shortage and low resource utilization rate has become a problem that must be solved in industrialization transformation. Harmonics are inevitable in the power system. A large number of harmonics in the power grid reduce the efficiency of power equipment in the public power grid, causing unnecessary losses in power generation, transmission and power consumption equipment. A large number of low-order harmonics will cause overheating of the transmission line, and in serious cases, a fire will endanger the safe operation of the power grid system. How to reduce grid harmonics and improve power utilization has become a problem to be solved for pow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/487H02M7/5395H02M7/5387
CPCH02M7/487H02M7/53871H02M7/5395
Inventor 何良宗陈嘉哲张建寰林立成高涵张勇
Owner XIAMEN UNIV
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