With online FDM tracking abrupt-changing operation point, SSMMC used PID control to deal with the transition-region difficulty, and an soft-switch skill was introduced in detail.

• 其次，基于对分形测度的分析，提出了以分形测度为切换指标的软切换控制，建立了基于工况辨识模型控制与过渡区间的PID控制相结合的控制系统，并实现控制的软切换。