Power quality measurement and analysis of offshore wind farm based on PSCAD/EMTDC models

The measurement and analysis of power quality for grid-connected offshore wind farm is one of the key issues. This paper attempts to address this technical challenge through a simulation-based study by the use of PSCAD/EMTDC models. We consider an equivalent model with 50MW capacity for offshore wind farm consisting of 10 doubly fed induction generators (DFIGs) to analyze the power quality at the grid-connected point. A set of indices, including voltage unbalance, harmonics, voltage fluctuation and flicker are discussed. Also, the wavelet transform is adopted to analyze the voltage fluctuation and flicker. Based on the findings and the national power quality standard, we suggest some measures to improve the power quality.