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H-bridge five-level active neutral point clamped inverter and dead zone effect suppression method

A dead-zone effect, five-level technology, applied to electrical components, AC power input conversion to DC power output, output power conversion devices, etc., can solve unfavorable motor insulation, increase system volume, cost and control complexity, etc. problem, to achieve the effect of suppressing the problem of multiple voltage jumps, increasing complexity, and being easy to realize by software programming

Active Publication Date: 2020-06-05
WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The dead time introduced to prevent the power supply from passing through will cause the multi-level leapfrog phenomenon at the zero-crossing point of the output voltage of the five-level active neutral point clamped H-bridge inverter, and the multi-level leapfrog phenomenon will cause Excessively high dv / dt, which puts forward higher design requirements for the main circuit absorption circuit and output filter, and is not conducive to the insulation of loads such as motors
[0004] At present, the existing research literature increases the volume, cost and control complexity of the system by using additional hardware to increase the freewheeling path.

Method used

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  • H-bridge five-level active neutral point clamped inverter and dead zone effect suppression method

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Embodiment Construction

[0032] Below in conjunction with accompanying drawing and example the present invention is described in further detail.

[0033] refer to figure 1 As shown, an H-bridge five-level active neutral point clamp (5L-ANPC) inverter disclosed by the present invention is composed of left and right bridge arms with completely identical structures, and each bridge arm is a five-level Active neutral point clamp topology, the two ends of the DC bus of the left and right bridge arms are connected in parallel and then respectively connected to the first voltage dividing capacitor C d1 and the second divider capacitor C d2 , the first divider capacitor C d1 and the second divider capacitor C d2 in series.

[0034] The five-level active neutral point clamp topology consists of switching devices S 1L / S 1R , Switching device S 1L ' / S 1R ', switching device S 2L / S 2R , Switching device S 2L ' / S 2R 'The first branch formed by sequential connection is formed by the switching device S...

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Abstract

The invention discloses an H-bridge five-level active neutral point clamping inverter. The inverter is formed by connecting a left bridge arm and a right bridge arm of a five-level active neutral-point clamped topological structure, the two ends of a direct-current bus of the left bridge arm and the two ends of a direct-current bus of the right bridge arm are connected in parallel and then connected with a first voltage-dividing capacitor Cd1 and a second voltage-dividing capacitor Cd2 respectively, and the first voltage-dividing capacitor Cd1 and the second voltage-dividing capacitor Cd2 areconnected in series. The invention also discloses a dead zone effect inhibition method. The switching state of a high-voltage tube within the dead time of a voltage zero-crossing point is maintained in the previous state, and a follow current path in dead time is changed, so that the 5L-ANPC inverter outputs zero level in the dead time, the multi-level override jump problem caused by the dead effect at the zero crossing point of the output voltage of the active neutral point clamped five-level H bridge is inhibited, and the requirement on the output load dv / dt is reduced.

Description

technical field [0001] The invention belongs to the technical field of converter control, and in particular relates to an H-bridge five-level active mid-point clamping inverter and a dead-zone effect suppression method thereof. Background technique [0002] Multilevel converters have the advantages of high power factor, low switching loss, low harmonic content, low dv / dt, etc., and have been widely used in new energy grid connection, AC speed regulation, DC power transmission and other fields. Compared with the traditional diode-clamped and flying-capacitor inverters, the five-level active neutral-point-clamped inverter does not require a large number of clamping diodes and clamping capacitors, and it is easy to achieve balanced control of capacitor voltages. , the complexity of the control system is low and is receiving more and more attention. [0003] The dead time introduced to prevent the power supply from passing through will cause the multi-level leapfrog phenomenon ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/487H02M1/32
CPCH02M1/32H02M7/487H02M1/385
Inventor 邵俊波赵晓宇邱长青肖烨然
Owner WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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