水轮机调速系统的非线性自适应控制

水门开度控制不仅对电力系统暂态稳定性的改善有极其重要的作用,而且对抑制电力系统低频振荡、改善动态品质也有不可低估的作用。国内外水轮机调速器的控制器设计通常是基于具有准确参数的理想水轮机模型。论文考虑了水轮发电机固有的非线性以及水轮机参数的不确定性,基于微分几何理论和自适应控制方法推导了水轮机调速的非线性自适应控制律(NAC)。数字仿真试验表明,所设计的调速器控制律具有较强的参数自适应能力,在改善系统动态特性和提高系统大干扰稳定性方面优于未考虑参数不确定的非线性控制律(CNGC)。

Adaptive Nonlinear Control for Hydraulic Turbine Governor

Hydraulic turbine governor control has played an important role in not only improving power system transient stability but also restraining the low-frequency oscillation and bettering dynamic performance. Different from the former work based on the ideal hydraulic turbine model with accurate parameter, this paper has proposed a nonlinear adaptive control strategy on the basis of comprehensive nonlinear model with inaccurate parameter by utilizing the differential geometry method and adaptive control theory. Computer simulation tests have been carried out in a simple power system. The results verified the suggested control strategy has adapted well to the parameter inaccuracy and performed better than nonlinear control strategy without considering the parameter uncertainty in improving the system dynamic performance and transient stabiliy.