关键词: MATLAB, 特征方程, 根轨迹, 水轮机调节

Abstract: In the past studies on root locus plotting for hydro-turbine regulating system, some of the less affected parameters tend to be ignored in determining the root locus. However, the ignorance has an impact on the dynamic quality of the system in some degree. According to the above problem, the characteristic equation of the closed loop transfer function of the hydro-turbine regulating system is employed to plot the root locus and the ignored problem of some less affected parameters can be avoided effectively. Further, the response time of regulating system to rotate speed signal is analyzed to study the relationships between the poles of conjugate complex number, poles of real number, buffering time constant and temporary droop. The plotting method of root locus for hydro-turbine regulating system and the analysis on regulating quality of hydraulic turbine are introduced.

Key words: MATLAB, characteristic equation, root locus, hydro-turbine regulating