随着电力系统的日益复杂，传统的水轮发电机励磁控制方式已不能满足其控制要求。
Owing to the increasing complexity of power systems, the traditional control theories of excitation controllers of turbine generators can not satisfy the requirement of control.
本文经理论分析提出“系统中产生负阻尼的原因是不适当的励磁控制方式”的结论。
This paper analyzed the effects of several excitation controllers, and found that the unsuitable controller can cause a low frequency oscillation on power system.
而最优励磁控制是当前研究最多的励磁控制方式，已在部分电站应用，但需要在实践中进一步完善。
The linear optimal excitation controller?(LOEC) is mostly studied in excitation systems, and has been used in some plants, but it needs to be more improved in practice.
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