本程序应用多端口网络方程和故障端口边界方程联立求解的方法，计算电力系统各种多重故障及任意不对称运行的电压和电流。
In this program the voltage and current of simultaneous faults or unbalanced power system are calculated by solving the simultaneous equations of multi-port network and of the fault boundary.
为了提高计算效率，将多重网格方法应用到方程的数值求解中来加速收敛。
The multigrid techniques are added to accelerate the convergence of flow and adjoint equations to improve the efficiency of design.
我们用多重尺度方法，推导出了它的振幅方程。
By the virtue of method of multiple scales, we have derived the amplitude equation.
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