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A buck-boost three-level inverter based on zeta

A three-level inverter, buck-boost technology, applied in electrical components, high-efficiency power electronic conversion, output power conversion devices, etc., can solve the application limitations of multi-level inverters, large input voltage changes, No longer meet and other problems, to achieve the effect of reducing the number of circuit components, small switching loss, and small voltage stress

Active Publication Date: 2019-02-01
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the output AC voltage on the inverter side of the traditional voltage-type multilevel inverter topology is lower than the input voltage on the DC side, that is, it is in a step-down output state; in the field of new energy power generation, such as wind power generation, solar power generation, etc. Influenced by environmental factors such as wind strength, light intensity, and battery surface temperature, the input voltage varies greatly, and the output side needs a relatively stable AC output whether it is connected to the grid or connected to the load.
This feature limits the application of multi-level inverters in new energy applications
Using the traditional multi-level inverter will no longer meet the requirement of step-down and step-down to produce a relatively stable AC output

Method used

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  • A buck-boost three-level inverter based on zeta
  • A buck-boost three-level inverter based on zeta
  • A buck-boost three-level inverter based on zeta

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with accompanying drawing:

[0028] Such as figure 1 As shown, the present invention mainly includes DC power supply U in , the first power switch tube S 1 , the second power switch tube S 2 , the third power switch tube S 3 , the fourth power switch tube S 4 , the first diode D 1 , the second diode D 2 , the first inductance L 1 , the second inductance L 2 , the third inductance L f , the first capacitance C 1 , the second capacitance C f , load R; the first inductance L 1 The upper ends are respectively connected to the second inductor L 2 Lower terminal, the first capacitor C 1 Left end, DC power supply U in "+" terminal connection; the first inductance L 1 The lower end and the first diode D 1 anode connection, the first diode D 1 Cathode and first power switch tube S 1 collector connection, the first power switch S 1 Emitter and DC power supply U in "-" terminal connection; the...

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Abstract

The invention discloses a buck-boost three-level inverter based on Zeta, which adopts two improved Zeta circuits that can realize buck-boost output and is composed of outputs in series, which can realize DC / AC single-phase inversion. The basic function of the inverter is: it can realize buck-boost inversion. When the input DC voltage is low or the variation range is large, the dual Zeta buck-boost multi-level inverter can still complete the inversion function normally, and There is a stable AC output. The invention has the advantages of high reliability, simple circuit structure, easy control, high efficiency, reduced zero-crossing distortion of the output voltage, long working life, good harmonic spectrum, less voltage stress on the switch tube, low switching loss and the like.

Description

technical field [0001] The invention relates to the field of electric energy conversion, in particular to a multi-level inverter which can be expanded to output more levels and can realize both step-up and step-down. Background technique [0002] The multi-level inverter obtains more output levels by changing its own structure, and at the same time, the voltage and current stress borne by its switch tubes are also improved. Under the condition that the switching tubes bear the same voltage and current level and work at the same switching frequency, compared with the two-level inverter, the output voltage of the multi-level inverter is closer to the sine wave, and the harmonic characteristics are better . Therefore, in high-power applications, multi-level inverters are receiving more and more attention. The main application scope includes high-voltage and high-power frequency conversion speed regulation, reactive power compensation of power system and active filter device, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M7/5387
CPCH02M7/483H02M7/5387H02M1/0058Y02B70/10
Inventor 王立乔杨彬
Owner YANSHAN UNIV
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