Load models for modeling dynamic behaviors of reactive loads: Evaluation and comparison

Load modeling has a significant impact on power system dynamic analysis. Currently, static load models are commonly used in the power industry to model dynamic behaviors of reactive loads. Dynamic and composite load models are recommended to possibly improve modeling accuracy for reactive power. In this paper, the performance of six load models proposed in the literature for modeling dynamic behaviors of reactive loads are evaluated and compared. The issues of estimation accuracy and model complexity are compared to evaluate the estimation performance of each model. Numerical results indicate that static load models do not adequately model dynamic behaviors of reactive loads. A first-order induction motor model can satisfactorily capture the dynamic behaviors of reactive loads, while composite load models can accurately capture the dynamic behaviors of reactive loads. In addition, the issue of the incorporation of dynamic load models increasing the dimension of system representation is addressed.