Non-bridge multilevel conversion device and control method thereof

A conversion device and multi-level technology, applied in the direction of output power conversion device, high-efficiency power electronic conversion, AC power input conversion to DC power output, etc., can solve the problems of increasing and limiting converters, and expand the scope of application , the effect of highlighting the substantive characteristics

Active Publication Date: 2022-07-05
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The current method is to introduce switched capacitor technology into the conversion topology. Through the combination of switching devices and capacitors, multi-level output can be realized, which has the advantages of high efficiency, large voltage gain, and small size. However, these converters need to pass Adding an H bridge to change the polarity of the output voltage, the maximum voltage stress on the switching device of the converter increases with the increase of the output voltage gain, which limits the practical application of the converter

Method used

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  • Non-bridge multilevel conversion device and control method thereof
  • Non-bridge multilevel conversion device and control method thereof
  • Non-bridge multilevel conversion device and control method thereof

Examples

Experimental program
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Embodiment 1

[0040] like figure 1 As shown, a non-bridge multilevel conversion device is set at the DC voltage source V dc and load, including forward bridge arm, reverse bridge arm, middle bridge arm, anti-series bridge arm, capacitor C 1 and reverse bridge arm;

[0041]The forward bridge arm includes a switch tube S connected in series 1 and switch tube S 2 , the switch tube S 1 the collector and the switch S 2 The emitter is connected and the midpoint position is used to connect one end of the load, the switch S 1 The emitter is connected to the DC voltage source V dc The negative pole of the switch tube S 2 The collector is connected to the DC voltage source V dc the positive pole.

[0042] The middle bridge arm includes a switch tube S 12 , switch tube S 13 and switch tube S 14 , the switch tube S 12 The collector is connected to the DC voltage source V dc the positive pole of the switch tube S 13 The emitter, the switch tube S 14 the collector and the switch S 12 The...

Embodiment 2

[0074] like Figure 12 shown, the DC voltage source V dc At least two switch capacitor units are arranged between the switch and the reverse bridge arm. For each additional switch capacitor unit, the output voltage gain increases by V dc , the number of output levels is 2n+1. In addition, since the extended structure is composed of n switched capacitor units, the maximum voltage stress on each switch tube is still V dc The invention effectively solves the technical problem of excessive voltage stress on the switching tube caused by the increased output voltage of the switched capacitor multilevel converter, making the invention suitable for medium and high voltage occasions and expanding the application range of the converter.

Embodiment 3

[0076] A non-bridge multi-level conversion system, comprising a controller and a multi-level conversion device, the multi-level conversion device is the non-bridge multi-level conversion device, and the controller controls the non-bridge multi-level conversion device The control method of the non-bridge type multi-level conversion device is executed when the switch in the multi-level conversion device operates. The controller includes a DSP, an FPGA and a peripheral circuit, and the controller is connected in communication with the multi-level conversion device, so as to realize the adjustment of the working mode by adjusting the on-off of the switch tube.

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Abstract

The present invention provides a non-bridge multilevel conversion device, which is set at the DC voltage source V dc and load, including forward bridge arm, reverse bridge arm, middle bridge arm, anti-series bridge arm, capacitor C 1 and the reverse bridge arm; the middle bridge arm, the anti-series bridge arm and the capacitor C 1 A switched capacitor unit is formed, and the number of the switched capacitor unit can be expanded. By switching in different working modes, multi-level output is realized, and at the same time, the voltage stress on the switch tube will not be too large as the output voltage increases , the maximum voltage stress of the switch tube does not exceed the input voltage of the DC side, which solves the application problems in medium and high voltage occasions.

Description

technical field [0001] The invention relates to the fields of power electronics and electric energy conversion, new energy power generation and distribution, etc. In particular, it relates to a non-bridge multilevel conversion device and a control method thereof. Background technique [0002] Multilevel converters are composed of components such as DC power supplies, active switches and power diodes, which can generate voltage waveforms with low total harmonic distortion and play an important role in energy conversion systems such as photovoltaic power generation. [0003] Traditional multilevel converters are generally divided into diode clamp type, flying capacitor type and cascaded H-bridge type. Among them, the diode-clamped and flying-capacitor multilevel converters use a large number of clamping diodes and clamping capacitors to increase the number of output levels, but their circuit structures are complex, which increases the difficulty of control. Cascaded multi-lev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M7/5387
CPCH02M7/483H02M7/53871H02M1/007H02M7/4835Y02E10/56
Inventor 王要强库若含刘陈王克文陈根永梁军
Owner ZHENGZHOU UNIV
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