This paper develops a distribution circuit multi-time-scale simulation tool for applications\nin wind turbine and photovoltaic (PV) integration analysis. The proposed simulation tool developed\nin MATLABTM includes several distribution circuit components, such as voltage sources, distribution\nlines, transformers, loads, capacitor banks, wind turbines and PVs. Each equipment consists of three\nmodels for simulations in three different time scales, i.e., steady-state, electromechanical transient\nand electromagnetic transient models. Therefore, the proposed tool is able to perform a long-term\nsimulation involving power system phenomena spreading across time scales. The test circuits\nemployed to perform multi-time-scale simulation in this paper are modified from the IEEE four-node\ntest feeder. The simulation scenarios include wind speed and solar irradiance ramp up and down;\na capacitor bank is energized and de-energized; and a single-line-to-ground fault occurs and clears\nitself. The simulation results show that the proposed tool is capable of evaluating power system\nphenomena spread across time scales.
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