Rotor angle estimation of synchronous generator from online measurement

Many different methods for parameter estimation of synchronous generators in the well-known d-q models have been developed. In such methods, rotor angle is assumed to be measurable, while such a signal may not always be available in power stations. A new method for rotor angle estimation of a synchronous generator with unknown dynamic parameters from commonly available signals in online measurements such as electrical power, reactive power, terminal voltage, field current and field voltage, following a small perturbation of the field voltage, is described in this paper. Simulation and experimental results show good accuracy of the estimated signal compared with sampled rotor angle in a simulated nonlinear model.