针对传统开关函数模型只能描述电路的控制变迁而忽略了电路的条件变迁这一不足,建立了一种新型逆变电路更为精确的混合逻辑动态(mixed logical dynamical,MLD)模型,并将其作为预测模型,研究了航空新型电路的有限控制集模型预测控制(fini...针对传统开关函数模型只能描述电路的控制变迁而忽略了电路的条件变迁这一不足,建立了一种新型逆变电路更为精确的混合逻辑动态(mixed logical dynamical,MLD)模型,并将其作为预测模型,研究了航空新型电路的有限控制集模型预测控制(finite control set model predictive control,FCS-MPC)。FCS-MPC充分利用电路的离散特性,通过比较预测电压值和参考电压值的大小,将其差值作为衡量输入量的目标函数,最后选择电路控制集中使目标函数值最小的开关状态作为电路的控制输入,有效地解决了模型预测控制中混合整数二次规划(mixed integer quadratic programming,MIQP)问题的求解。仿真和实验验证了该控制方法具有良好动静态特性,证实了所提方法的有效性。展开更多
The 27-level cascaded multilevel inverter (CMLI) is a popular CMLI, since it can produce an output voltage with nearly sinusoidal wave form and may be realized as a trinary asymmetric CMLI that consists of only three ...The 27-level cascaded multilevel inverter (CMLI) is a popular CMLI, since it can produce an output voltage with nearly sinusoidal wave form and may be realized as a trinary asymmetric CMLI that consists of only three H-bridges. A new approach using a mixed integer linear programming (MILP) model is applied, that can determine the switching angles of this CMLI that minimize the values of any undesired harmonics. The model is applied first to determine the number of harmonics to be minimized to obtain least percentage total harmonic distortion (%THD) utilizing the 13 positive levels of the inverter. The obtained result is then included in the model and it is solved for different values of the output voltage. Single phase and three phase cases are investigated. The results show very low values of %THD and low order harmonics over wide voltage range till the 91st harmonic in both cases, which agree with the IEEE standards 519-1992 for voltage distortion limits till 161 kv.展开更多
文摘针对传统开关函数模型只能描述电路的控制变迁而忽略了电路的条件变迁这一不足,建立了一种新型逆变电路更为精确的混合逻辑动态(mixed logical dynamical,MLD)模型,并将其作为预测模型,研究了航空新型电路的有限控制集模型预测控制(finite control set model predictive control,FCS-MPC)。FCS-MPC充分利用电路的离散特性,通过比较预测电压值和参考电压值的大小,将其差值作为衡量输入量的目标函数,最后选择电路控制集中使目标函数值最小的开关状态作为电路的控制输入,有效地解决了模型预测控制中混合整数二次规划(mixed integer quadratic programming,MIQP)问题的求解。仿真和实验验证了该控制方法具有良好动静态特性,证实了所提方法的有效性。
文摘The 27-level cascaded multilevel inverter (CMLI) is a popular CMLI, since it can produce an output voltage with nearly sinusoidal wave form and may be realized as a trinary asymmetric CMLI that consists of only three H-bridges. A new approach using a mixed integer linear programming (MILP) model is applied, that can determine the switching angles of this CMLI that minimize the values of any undesired harmonics. The model is applied first to determine the number of harmonics to be minimized to obtain least percentage total harmonic distortion (%THD) utilizing the 13 positive levels of the inverter. The obtained result is then included in the model and it is solved for different values of the output voltage. Single phase and three phase cases are investigated. The results show very low values of %THD and low order harmonics over wide voltage range till the 91st harmonic in both cases, which agree with the IEEE standards 519-1992 for voltage distortion limits till 161 kv.
