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.
仿真表明，与固定点线性最优励磁控制方式相比，非线性励磁控制方式具有更好的稳定性和动态品质。
Simulation results show that the nonlinear excitation controller law has better stability and dynamic performance than the linear optimum excitation controller law.
本文论述了励磁控制系统应满足发电机各种运行方式的要求，如负载运行、空载运行、系统故障等不同情况。
The performances of excitation control system must fit all the different operation conditions of generator, such as no load operation, loading, load rejection and different kinds of faults.
本论文是基于“三峡机电设备”课题的子课题“励磁系统控制方式的研究”。
The main subject of this dissertation is the research on the control mode of excitation system, which is a subsection of Sanxia Electromechanical Equipment Research.
实验结果表明，非线性励磁控制较其它几种控制方式具有明显的优越性。
The experimental results indicate that the nonlinear excitation control approach has obvious advantages over the other three control ones.
控制方式具有恒机端电压励磁调节、恒励磁电流调节、恒功率因数励磁三种。
The control way of system has 3-patterns: exciting regulator of constant terminal voltage, constant exciting current regulator and exciting regulator of constant power factor.
控制方式具有恒机端电压励磁调节、恒励磁电流调节、恒功率因数励磁三种。
The control way of system has 3-patterns: exciting regulator of constant terminal voltage, constant exciting current regulator and exciting regulator of constant power factor.
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