考虑电感饱和的逆变器变开关频率控制仿真

Simulation of Inverter Variable Switching Frequency Control Considering Inductor Saturation

不当操作会导致电感饱和状态下逆变器功率损耗严重,为了提升频率控制的稳定性,提出考虑电感饱和的逆变器变开关频率控制方法。根据逆变器的构成获取相关参数的矢量关系,利用基尔霍夫电压定律生成电感饱和状态的逆变器数学模型,通过旋转构建逆变器在dp坐标系下的数学模型,用于预测推导逆变器的电压值。设计开关控制的三大核心成分,分别为功率鉴定器、频率鉴定器和频率滞环比较器,利用电压定向矢量控制方法分别从三个核心成分中得出逆变器的损耗、功率控制结果以及频率状态量误差,完成逆变器变开关频率控制。实验结果表明,所提方法的电压控制效果较好,频率控制稳定性较高。

Improper operation may lead to serious power loss of inverters in the state of inductor saturation.In order 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 designed 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 control of the inverter.Experimental results show that the proposed method has good voltage control effect and high stability of frequency control.