Future Research

reactive load representation Qo is not appropriate and So is used instead.

Besides, correlation between the active and reactive time constants has been found. The real and reactive powers are coupled and both real and reactive power load models should be simultaneously identified, with coupling effects. The correlation is not constant for all situations since it is depending on how much other external stochastic disturbances affect the system. A more accurate dynamic model is then desired.

A good suggestion for future work is the implementation of a dynamic model as a combination of the studied physical model and a stochastic extension. The basic deterministic and physically based model of the load will be described by the proposed set of non-linear differential equations, [Karlsson and Hill, 1994], and the stochastic part will include the noise term, but also the representation of disturbances to the system which are not measured or known, or unmodeled dynamics of the system.

The large amount of data from field measurements described throughout the thesis will hopefully be a valuable source for the continuation of this work and for reducing uncertainty in the load representation.

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