The result indicates the nonlinear variable structure control can adjust the transmission power of DC line effectively, and assure the stability of the AC-DC system.

仿真结果表明，非线性变结构控制可以有效地调节直流线路的传输功率，保证交直流系统的稳定性。

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The rigid body model of single suspension magnet are established with flux density as state variable and the system stability is analyzed with flux feedback control.

建立以磁场强度为状态变量的单悬浮电磁铁刚体模型，分析磁通反馈控制下系统的稳定性。

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A design method of variable structure control for the d. C. servo system is proposed. Also the sliding state stability of the system is analyzed.

本文提出了直流随动系统的变结构控制设计方法，分析了系统的滑态稳定性。

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