T型三电平逆变器改进指令电流提取算法

An Improved Instruction Current Extraction Algorithm for T Three-level Inverter

针对T型三电平逆变器指令电流提取存在延时与准确性差等问题,提出了一套考虑电流限幅策略的快速指令电流提取与预测算法。首先,介绍T型三电平补偿装置的数学模型及补偿原理;其次,根据dq坐标变换前后不同频率分量之间的映射关系,设计了快速指令电流提取与预测算法,将指令电流提取时间缩短至10 ms,并结合电流限幅策略对所提算法进行进一步修正;最后基于仿真环境对所提算法进行分析,验证了所提算法的有效性和优越性。

Aiming at the problems of delay and accuracy of“T”three-level inverter instruction current extraction,a fast instruction current extraction and prediction algorithm considering current limiting strategy was proposed.Firstly,the mathematical model and compensation principle of“T”three-level compensation device were introduced.Secondly,in the dq 0 coordinate system,according to the mapping relationship between different frequency components,a fast instruction current extraction and prediction algorithm was designed to shorten the instruction current extraction time to 10 ms,and to further modify the proposed algorithm with the current limiting strategy.Finally,the algorithm was analyzed based on Matlab simulation environment to verify the effectiveness and superiority of the algorithm.