Unlock instant, AI-driven research and patent intelligence for your innovation.

A buck-boost switched capacitor multilevel inverter and its modulation method

A multi-level inverter, switched capacitor technology, applied in electrical components, AC power input into DC power output, output power conversion devices and other directions, can solve the problem of inflexibility of the inverter system, achieve simple structure, Control simple effects

Active Publication Date: 2021-08-31
ZHENGZHOU UNIV
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The switched capacitor multilevel inverter can generate a higher number of output levels through fewer switching devices, and has the advantages of small size, high efficiency, and high power density. It ha

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A buck-boost switched capacitor multilevel inverter and its modulation method
  • A buck-boost switched capacitor multilevel inverter and its modulation method
  • A buck-boost switched capacitor multilevel inverter and its modulation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] as attached figure 1 As shown, a buck-boost switched capacitor multilevel inverter is arranged between a DC input power supply and a load or an AC grid, and it includes a buck-boost switched capacitor unit and a full-bridge unit; the buck-boost switched capacitor unit A unit connected in parallel with the DC input power supply, used for step-up or step-down conversion of the DC input power supply, and outputting a multi-step voltage; the full bridge unit connected in parallel with the buck-boost switched capacitor unit used to convert the positive and negative polarities of the multi-step voltage output by the buck-boost switched capacitor unit, and transmit it to the load or the AC power grid.

[0036] On the basis of the buck-boost switched capacitor multi-level inverter in this embodiment, this embodiment provides a corresponding modulation method, and the buck-boost switched capacitor multi-level inverter is set with two control modes :

[0037] In boost mode, the...

Embodiment 2

[0043] This embodiment provides a specific implementation of a buck-boost switched capacitor unit, as shown in the attached figure 1 As shown, the buck-boost switched capacitor unit includes a switch tube S 5 , switch tube S 6 , switch tube S 7 , switch tube S 8 , Diode D 0 , electrolytic capacitor C 1 and electrolytic capacitor C 2 , the switching tube S 5 , the switching tube S 6 , the switching tube S 7 and the switching tube S 8 Respectively connect a freewheeling diode in antiparallel; wherein, the switching tube S 5 The input terminal of the DC input power supply is connected to the positive output terminal of the DC input power supply, and the switching tube S 5 The output is connected to the diode D 0 anode of the diode D 0 The cathodes are respectively connected to the switching tube S 6 input and the electrolytic capacitor C 1 the anode of the switch tube S 6 The output terminals are respectively connected to the switching tube S 7 input and the elect...

Embodiment 3

[0094] In this embodiment, the buck-boost switched capacitor multilevel inverter and its modulation method are verified through simulation.

[0095] In boost mode, the modulation method in Embodiment 2 is used to modulate the buck-boost switched capacitor multilevel inverter, Figure 14 is an example waveform diagram of the output voltage of the buck-boost switched capacitor multilevel inverter, Figure 15 It is the waveform diagram of the load current example of the buck-boost switched capacitor multi-level inverter; when the input voltage is 200V, through Figure 14 It can be seen that the buck-boost switched capacitor multilevel inverter can generate a five-level voltage waveform with a maximum voltage of 400V, which proves that the boost mode of the inverter structure of the buck-boost switched capacitor multilevel inverter is correct sex, Figure 15 The medium load current is a smooth sine wave, and the current phase lags behind the voltage phase, which proves that the ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention provides a buck-boost switched capacitor multi-level inverter and a modulation method thereof. A voltage switched capacitor unit and a full bridge unit; the buck-boost switched capacitor unit is connected in parallel with the DC input power supply, and is used for boosting or step-down converting the DC input power supply, and outputting a multi-step voltage; The full bridge unit is connected in parallel with the buck-boost switched capacitor unit, and is used to convert the positive and negative polarity of the multi-step voltage output by the buck-boost switched capacitor unit, and transmit it to the load or the AC power grid. The invention integrates step-up and step-down conversion, realizes step-up conversion and step-down conversion of the input power supply, and can perform online switching of the two control modes, improves the flexibility of the inverter system, and has a simple structure , Capacitive self-balancing and independent application to inductive loads.

Description

technical field [0001] The invention relates to the fields of electric energy conversion and new energy distributed grid-connected power generation, and specifically relates to a buck-boost switched capacitor multilevel inverter and a modulation method thereof. Background technique [0002] With the increasingly serious problems of environmental pollution and energy crisis, the development and utilization of clean and renewable energy has attracted much attention. Photovoltaic power generation has been widely used due to its advantages of wide distribution, clean production process, safety and reliability, and convenient maintenance. [0003] In the photovoltaic power generation system, the power electronic inverter is the core equipment of the power generation system. Although the traditional two-level inverter has a simple structure and mature technology, its output waveform has a lot of harmonic content and the voltage stress of the switching tube is large, which gradual...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H02M7/483H02M7/537
CPCH02M7/483H02M7/537
Inventor 王要强周成龙王克文梁军章健王明东王金凤袁艺森
Owner ZHENGZHOU UNIV