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Control method for output waveform improvement and low-loss short-circuit operation of inverter

A short-circuit operation and output waveform technology, which is applied to the irreversible DC power input to AC power output, output power conversion device, AC power input to DC power output and other directions, can solve problems such as large system loss, achieve Improve reliability, ease of implementation, avoid the effect of inductor current discontinuity

Active Publication Date: 2017-12-01
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

The traditional voltage outer loop and current inner loop control method has automatic current limiting capability in case of short circuit, and the converter still works in the high frequency switching state, resulting in large system loss

Method used

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  • Control method for output waveform improvement and low-loss short-circuit operation of inverter
  • Control method for output waveform improvement and low-loss short-circuit operation of inverter
  • Control method for output waveform improvement and low-loss short-circuit operation of inverter

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Embodiment Construction

[0035] The invention will be described in further detail below in conjunction with the accompanying drawings.

[0036] The present invention is illustrated by taking the double step-down full-bridge inverter and the traditional full-bridge inverter as examples. The topology of the main circuit is as follows: figure 1 (a) (b) shown.

[0037] 1) Eliminate zero-crossing distortion during normal production operation

[0038] Taking the dual step-down full-bridge inverter controlled by unipolar frequency doubling SPWM as an example, S 1 , S 4 High-frequency switching in the positive half cycle, not open in the negative half cycle, similarly, S 2 , S 3 In the negative half-cycle high-frequency switching, it is not turned on in the positive half-cycle, the carrier wave, modulating wave and various driving signals such as figure 2shown. Since halving the switching times can significantly reduce the driving loss and switching loss, however, there will be discontinuities when the...

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Abstract

The invention discloses a control method for output waveform improvement and low-loss short-circuit operation of an inverter and belongs to the technical field of the control method for a digital control inverter. The method comprises the steps as follows: when the inverter normally runs, four switch tubes work at the same time at the zero-crossing moment of inductive current through improving the control method of unipolar sinusoidal pulse width modulation and setting boundary conditions according to the inductive current ripple magnitude, and the inductive current is continuous; when the inverter is in ground short-circuit operation at an output side, the switch tubes are normally open to construct an inductive current free-wheeling circuit within a half cycle, so that the descending speed of the inductive current is reduced and the switching frequency of a power device during short-circuit operation is greatly reduced while inductive current limiting is achieved. According to the control method, zero-crossing distortion of an output voltage waveform during normal operation of the inverter is eliminated, and the system loss during ground short-circuit operation of the inverter is reduced.

Description

technical field [0001] The invention relates to a control method for improving the output waveform of an inverter and for low-loss short-circuit operation, and belongs to the technical field of digital control inverter control methods. Background technique [0002] Aeronautical static converter is a power conversion device that converts the direct current of an aircraft DC generator or storage battery into a 400Hz alternating current. Aviation static converters often require electrical isolation, and generally adopt a two-stage structure. The front-stage DC / DC converter realizes voltage matching and electrical isolation, and the rear-stage DC / AC inverter realizes waveform conversion. As an important part of the system, the inverter directly determines the quality of the output power. High reliability, high power density and high efficiency are important indicators to measure the performance of the inverter. [0003] With the development of control technology and the improve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02M7/5387H02M1/12
CPCH02M1/12H02M7/48H02M7/53873H02M1/0054Y02B70/10
Inventor 傅子锐张方华李世先孟无忌
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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