SPWM 控制算法的Matlab 仿真和失真度分析

针对航空发动机数字电子控制器的实时性和高性能要求，需保证数控系统中的传感器激励信号的高精度和低失真度，使传感器提供更准确地反馈信号以参与航空发动机数控系统的控制。基于数字电子控制器的硬件实现，分析和总结了在航空发动机数控系统中常见的传感器激励信号的发生方法，计算出了几种方法中对应的开启和关闭时间，并指出了各种方法的优缺点。最后提出了1种在硬件实现前的准确、可行的针对SPWM激励波形的仿真方法。详细描述了利用SPWM技术发生正弦信号的基本原理和几种常用方法中正弦信号的实际输出值对于理想输出值的逼近方法，并着重阐述了利用Matlab数学工具仿真生成SPWM信号及计算其失真度的方法，最后得出各种方法的实际输出效果。

Research on Matlab Simulation and THD Analysis for SPWM Control Algorithm

For the real time and high performance requirement of aeroengine digital control system, the output of the high precise andlow Total Harmonic Distortion (THD) excitation signal of the transducer should be guaranteed to more accurately provide signal acquisition for the control of aeroengine digital control system. Based on the hardware realization of digital electronic controller analysis, several common relevant solutions of the transducer excitation in the engineering application of aeroengine digital control system were summarized.The opening time and the turn-off time were calculated and advantages and disadvantages of every method were performed. Finally, an accurate and feasible simulation method for the SPWM excitation waveform was proposed before the hardware implementation. It describedthe basic principles in the generation of SPWM in details and the approximate calculation method of the actual output value of the sine signal in methods which described above for the ideal output value, and emphatically expounded the Matlab simulation, THD calculation and the actual output effect by using mathematical tool of Matlab.