Fixing attention on the active controlling causes of water hammer, for the long_distance water supply system, the optimal control of transient multiple valves regulation is put forward.

着眼于水锤发生源的主动控制，对于长距离输水系统的水锤现象提出了瞬态多阀调节最优控制理论。

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Second, by means of the transient stability calculation for single and multiple faults, the stability of Guangdong power grid as a multiinfeed AC/DC power system is studied.

其次，通过对发生单重和多重故障时的暂态稳定计算，研究了作为多回直流受端系统的广东电网在发生直流双极闭锁故障时的运行稳定性问题。

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