Dead zone compensation method and device based on asymmetric vector action time

Abstract

The invention discloses a dead zone compensation method and device based on asymmetric vector action time. The method comprises the following steps: calculating a dead zone equivalent time error according to inherent dead zone time of a driver, a switching state switching sequence, a current direction, a switching tube voltage drop and a diode voltage drop; and after the switching moment generatedby the dead zone effect is determined according to the current direction, adding the dead zone equivalent time error at the switching moment generated by the dead zone effect, and carrying out out dead zone compensation. The invention solves the problems that: in the prior art, only a dead zone of a system is compensated, but smooth transition during sector switching in the compensation process is not considered, the inverter generates the phenomenon that the two-phase switching state is changed at the same time, then the output level is subjected to non-unit mutation, therefore the action effect of dead zone compensation is affected, in addition, the maximum voltage and power loss borne by the power switch tube are increased, the device explosion is caused, and the like.

Description

technical field [0001] The present application relates to the field of electronic technology, and in particular to a dead zone compensation method and device based on asymmetric vector action time. Background technique [0002] With the development of power electronics, the three-level neutral point clamp topology is widely used because of its advantages of high output voltage, high output capacity, and low voltage at both ends of a single transistor. Combined with the three-level space vector modulation method, it can effectively improve the utilization rate of the DC side voltage and reduce the output harmonics. In the three-level bridge inverter circuit, in order to ensure that the voltage drop of the tube is half of the DC side voltage and prevent the switch tube from passing through, a dead time must be added when the switch is switched. The dead time is short and the output error is very small during a single switching cycle. However, when the switch operates at high...

AI Technical Summary

Problems solved by technology

[0004] This application provides a dead zone compensation method and device based on the action time of an asymmetric vector, which is used to solve the problem that the existing technology only compensates the dead zone of the system, but does not consider the smooth transition problem during sector switching during the compensation process. The phenomenon that the two-phase switch state of the inverter changes simultaneously and the output level changes suddenly, which affects the effect of dead zone compensation. In addition, the maximum voltage and power loss of the power switch tube will increase, causing the device to explode, etc. technical problem

Images