P. M. Anderson and M. Mirheydar, "A low-order system frequency response model," in IEEE Transactions on Power Systems, vol. 5, no. 3, pp. 720-729, Aug. 1990, doi: 10.1109/59.65898.
keywords: {Frequency response;Power system modeling;Power system dynamics;Frequency estimation;Power generation;Impedance;Frequency synchronization;Nonlinear dynamical systems;Nonlinear equations;Turbines}