This paper presents an approach to characterizepower system loads through estimation of contributions from individual load types. In contrast to methods that fit one aggregatemodel to observed load behavior, this approach estimates theinventory of separate components that compose the total powerconsumption. Common static and dynamic models are used torepresent components of the load, and parameter estimationis used to determine the amount each load contributes tothe cumulative consumption. Trajectory sensitivities form thebasis of the parameter estimation algorithm and give insightinto which parameters are well-conditioned for estimation.Parameters of interest are contributions to total load and initialconditions for dynamic loads. Results are presented for twosimulation-based studies and demonstrate the feasibility of theapproach. In the first study, the composition of multiple loadsconnected to a bus was estimated by subjecting the bus to astep change in voltage. The second study utilized a disturbancein the WSCC nine-bus test system to facilitate estimates of thecombination of loads connected at a bus in the system.
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