Sensitivity analysis of d.w.r. synchronous generator

The roots of the characteristic equation of a divided-winding-rotor (d.w.r.) synchronous machine equipped with regulators for controlling voltage, torque angle and speed are evaluated. Under different operating conditions, sensitivities of the critical root of the system for small variations in various control parameters are determined. From these results, the effect of the parameters on the root locations, and hence on system performance, can be ascertained. Using this approach, it is shown how the parameters of the control circuits of the d.w.r. synchronous machine may be chosen for better steady-state and transient performance.