Method for small-signal stability assessment of power systems using shunt current injection source side and series voltage injection load side perturbations

A novel method for real-time small-signal stability analysis for power electronic-based components in a power system. The method may be used to monitor a power system in real-time by perturbing the source side of an electronic-based component of the power system of about 0.5 to 1 percent of a nominal current of the power system at the source side using shunt current injection, and perturbing the load side of the power electronic-based component by varying the voltage at the load side using series voltage injection. Time-domain results of the perturbations may be transferred to frequency-domain results and the stability of the power system may be monitored by obtaining a Nyquist contour and employing unit circuit criterion or Generalized Nyquist Criterion.