包括面积、周长、矩形度、伸长度，均值便宜跟踪的示例，与理论分析结果相比，基于SVPWM的三电平逆变的matlab仿真，用于时频分析算法，可以得到很精确的幅值、频率、相位估计。- Including the area, perimeter, rectangular, elongation, Example tracking mean cheap, Compared with the results of theoretical analysis, Based on SVPWM three-leve