基于BPPID控制的T型三电平逆变器中点电位平衡的研究  

Research on Mid-point Potential Balance of T-type Three-level Inverter Based on BPPID Control

作　　者：李家强 屠立忠[1] 唐立 蔡海艳 LI Jiaqiang;TU Lizhong;TANG Li;CAI Haiyan

机构地区：[1]南京工程学院

出　　处：《科技创新与应用》2019年第24期17-19,共3页Technology Innovation and Application

摘　　要：文章针对当T型三电平的平衡电路中两个桥臂的电容和电感元件不平衡时,如何采取控制策略抑制中点电压波动的问题。通过建立模型分析得到T型三电平中点电位不平衡的原因,增设平衡电路,采用两个LC串联桥臂的平衡电路控制中点电位平衡。在运行过程中,LC通常会受外部环境干扰,如强耦合,电磁扰动等因素使得平衡电路中点电位产生波动,因此文章提出一种基于BP神经网络的PID控制器(后文简称BPPID)。对BPPID控制器进行了Matlab/Simulink仿真研究与分析。仿真结果表明,基于BPPID控制的T型三电平逆变器具有操作可行性。This paper aims at the problem of how to adopt control strategy to suppress midpoint voltage fluctuation when the capacitance and inductance of two bridge arms in T-type three-level balance circuit are unbalanced. Through the establishment of the model, the reason for the imbalance of the midpoint potential of the T-type three-level is obtained, the balance circuit is added, and the balance circuit of two LC series bridge arms is used to control the balance of the midpoint potential. In the process of operation, LC is usually disturbed by the external environment, such as strong coupling, electromagnetic disturbance and other factors make the midpoint potential of the balance circuit fluctuate, so a PID controller based on BP neural network (BPPID for short) is proposed in this paper. The Matlab/Simulink simulation of BPPID controller is studied and analyzed. The simulation results show that the T-type three-level inverter based on BPPID control has operational feasibility.

关 键 词：T型三电平 BPPID控制 中点电压平衡 

分 类 号：TM464[电气工程—电器]