利用水电机组水压反馈改善电力系统稳定性

通过对水电机组复杂非线性模型的仿真，研究了水轮机调速器控制规律对电力系统稳定性的影响，并提出了采用水压反馈改善电力系统稳定的控制思想。仿真研究结果表明：由于水电机组引水系统的水击效应，原动机的自动调节会恶化系统阻尼，使转子摇摆曲线的衰减速度明显减慢，而引入水压的微分反馈可加快振荡过程的衰减，有效改善电力系统的稳定性。文中所提方法简单，易于在水电机组调速器上实现。

Improving Power System Stability by Use of Water Pressure Feedback of Hydroturbine

By means of simulation of complex nonlinear model of hydroturbine generating unit, the impact of the control law of hydraulic turbine governor on power system stability is researched, and a control idea of adopting water pressure feedback to improve power system stability is proposed. Simulation results show that due to the water hammer effect of water diversion system for hydroturbine generating unit, the automatic regulation of prime mover may deteriorates system damping and makes the decay rate of rotor vacillation decelerated evidently; however, by means of introducing the derivative feedback of water pressure the attenuation of rotor vacillation can be accelerated and improve power system stability effectively. The proposed method is simple and easy to implement in hydraulic turbine governor.