两相流不稳定性理论分析方法可以分为两大类：一类是数值解析法，另一类是近似分析法。

Theoretical approach of two-phase flow instability can be divided into two categories: numerical analysis and approximation analysis.

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并在Lyapunov稳定性理论的基础上，提出了一种新的三相四线三电平中点箝位pwm整流器非线性控制方法。

Then a new nonlinear control law based on LYAPUNOV's stability theory for the PWM rectifier is presented.

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并在Lyapunov稳定性理论的基础上，提出了一种新的三相四线三电平中点箝位pwm整流器非线性控制方法。

Then a new nonlinear control law based on LYAPUNOV's stability theory for the PWM rectifier is presented.

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