This letter proposes a method to identify the time of event in the context of event-based inertia estimation of a power system. We formulate the square error between time series of frequency and a polynomial-based model tailored for this purpose. The model consists of constant-valued and polynomial parts, which are connected at the time of event. Based on the square error formulated, we solve a minimization problem numerically to find the best-fitting time of event.
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