Simulation of Inverter Variable Switching Frequency Control Considering Inductor Saturation
Improper operation may lead to serious power loss of inverters in the state of inductor saturation.In or-der to improve the stability of frequency control,this paper presented a method of controlling the variable switching frequency of inverters considering inductor saturation.According to the composition of the inverter,we determined the vector relationship of relevant parameters.Then,we built a mathematical model of the inverter in the state of inductor saturation by Kirchhoff voltage law.Moreover,we constructed a mathematical model of the inverter in dp coordinate system through rotation,which was used to predict and deduce the voltage value of the inverter.In addition,we de-signed three components of switching control including power detector,frequency detector and frequency hysteresis comparator.Finally,we used the voltage-oriented vector control method to extract the loss,power control result and frequency state error of the inverter from three core components,thus completing the variable switching frequency con-trol of the inverter.Experimental results show that the proposed method has good voltage control effect and high stabil-ity of frequency control.
Saturable inductorInverterSwitching frequency controlFrequency loopKirchhoff voltage law
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