The classical constant-power load model is usually used to solve the load flow problem of a transmission or distribution system. However, the actual load of a system is not independent of voltage magnitude. Incorporation of voltage dependent load models in the load flow algorithm is essential to get better and accurate results. This paper compares the load flow results of a distribution system for various voltage dependent load models. The load flow problem of a distribution system is also formulated in terms of three sets of recursive equations so that very sophisticated voltage dependent load models can easily be incorporated in these equations. A 12.66 kV, 33-bus distribution system was used to observe the effects of load models on the load flow results. The convergence patterns of the load flow method for various load models were also compared.
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