中文说明： 计算时间和二维直方图,基于SVPWM的三电平逆变的matlab仿真，关于超声波倒车雷达测距的，最小二乘回归分析算法，到达过程是的泊松过程，电力系统暂态稳定程序，可以进行暂态稳定计算。
English Description：
Calculation time and two-dimensional histogram, matlab simulation of three-level inverter based on SVPWM, least square regression analysis algorithm of ultrasonic reversing radar ranging, Poisson process of arrival process, power system transient stability program, transient stability calculation can be carried out.