An optimization method of igbt dead time

Abstract

The invention relates to an optimization method of an IGBT dead zone time. The optimization method comprises the following steps: (1) adopting an IGBT to be optimized to build a converter; (2) enabling the converter to run at a current set dead zone time to acquire key performance parameters of the converter at the dead zone time; (3) reducing the dead zone time with a step length delta Td, and executing the step (2) in a circulation manner until the key performance parameters of the converter dramatically change; (4) drawing a performance parameter-time curve of each performance parameter, changed along with the dead zone time, acquiring the dead zone time enabling the corresponding performance parameter not to exceed a set threshold as the dead zone time to be selected according to the corresponding performance parameter-time curve; and (5) selecting a maximum value from a plurality of dead zone times to be selected, and keeping a certain allowance as the optimal dead zone time of the IGBT. Compared with the prior art, the optimization method is simple and convenient to implement and can effectively improve the control performance of a converter system on the premise of ensuring safe and reliable running of the converter.

Description

technical field [0001] The invention relates to the field of power electronic devices, in particular to a method for optimizing the dead time of an IGBT. Background technique [0002] Converter is a kind of electric energy conversion device, which is widely used in many fields such as new energy power generation, transportation, metallurgy and so on. As a key technical parameter of the converter, the dead time has an important impact on the operation and control performance of the system. If the dead time is too small, it may cause the IGBT bridge arm to pass through, resulting in excessive short-circuit current, loss and electromagnetic interference, which will reduce the operating performance of the converter and even cause device damage; zone effect, reduce the accuracy of the output voltage of the converter, increase the low-order harmonics (especially for low-voltage operation), and deteriorate the control performance of the converter. Therefore, it is very important ...

AI Technical Summary

Problems solved by technology

This method requires an additional current polarity detection circuit and the output accuracy of the converter near the zero-crossing point of the over-current may decrease.

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