IGBT narrow pulse suppression method for three-level converter

Abstract

The invention relates to an IGBT narrow pulse suppression method for a three-level converter. The method comprises the following steps: (1) detecting a present current direction and an output voltage state of each phase of the three-level converter in real time; (2) when an output voltage is located at a positive peak point, if a phase current is set to be positive, turning off a switch tube s3 of a phase bridge arm all the time, if the phase current is set to be negative, calculating turn-on time T<on> of the corresponding switch tube according to the volt-second balance principle, if the T<on> is smaller than a set value, making the T<on> equal to T<D>, removing a narrow pulse after passing through a dead zone logic, wherein the T<D> is the dead zone time of an IGBT; and (3) when an output voltage is located at a negative peak point, if the phase current is set to be negative, turning off a switch tube s1 of the phase bridge arm all the time, if the phase current is set to be positive, calculating the turn-on time T<on> of the corresponding switch tube according to the volt-second balance principle, if the T<on> is smaller than the set value, making the T<on> equal to the T<D>, and removing the narrow pulse after passing through the dead zone logic. The IGBT narrow pulse suppression method has the advantages of being simple to achieve and high in narrow pulse suppression capability.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a method for suppressing narrow pulses of IGBTs of a three-level converter. Background technique [0002] Compared with the traditional two-level full-bridge topology, the three-level NPC (neutral-point clamped) topology has a series of advantages: 1) small switching loss and high efficiency; 2) small dv / dt during switching action , the electromagnetic interference (EMI) caused by it is small; 3) the output voltage waveform is three-level, the harmonic content is small, and the required filter inductance is small, which is beneficial to reduce the system cost and power loss. It is precisely because of the above advantages that the three-level NPC topology has been widely used in medium voltage and high power, and has achieved good application results. Due to the development of technology and the improvement of the performance of digital chips and power elec...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a three-level converter IGBT narrow pulse suppression method to solve the problem that the narrow pulse phenomenon in the three-level converter leads to increased loss and even damage to the switching tube

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