MLD模型下逆变电路改进型直接功率预测控制

建立了新型逆变电路精确的混合逻辑动态(MLD)模型,并将其作为预测模型,研究了新型逆变电路基于预测直接功率控制(P-DPC)的模型预测控制方法。为了达到航空电源电压输出要求和降低开关损耗,在原来的3+3电压矢量控制序列法的基础上扩充了零矢量进行了改进,形成了一种新的对称的4+4电压矢量序列法,通过对下一时刻输出电压有功和无功分量的预测,在最小化目标函数值的基础上求出每一个电压矢量的作用时间,完成电路的控制。该方法减小了输出电压THD,具有良好动静态特性有一个较为稳定的开关频率,仿真和实验验证了所提方法的可行性和有效性。

An Improved P DPC for Inverter Based on MLD Model

This paper builds a mixed logical model for a new inverter, and treats it as a predictive model in order to research the predictive direct power control for inverter. In order to achieve the aviation power supply requirements and reduce the switching losses, the zero vector improves to the original 3+3 voltage vector control sequence method. By calculating the active and reactive components of the output voltage at the next time, the action time of each voltage vector is obtained on the basis of minimizing the objective function value to complete the control of the circuit. The method reduces the output voltage THD, 4+4 voltage vector sequence method is good in dynamic and in static characteristics, and stable in switching frequency. The result shows that the method is feasible and valid.