Simulation and modeling of blended constant-frequency and variable-frequency air-conditioner

The conventional constant frequency airconditioner (CFAC) and the inverter based variable-frequency air-conditioner (VFAC) are increasingly used now. The study of air-conditioner based load and its impact on power system is greatly demanded. In this paper, the characteristics of CFAC and VFAC are investigated, respectively. Then, a modeling method of blended air-conditioner (BAC) load is proposed, and parameters of CFAC and VFAC are studied in detail. Later, the proposed model is tested in real power system. It is found that the characteristics of blended air-conditioner model is strongly related to the composition proportion of CFAC and VFAC, and they apparently affect power grids especially on voltage/reactive power issues.