Abstract:Due to the variability of offshore wind resources and the existence of many power electronic components in wind turbines, power quality problems will occur after offshore wind farms are connected to the grid. This paper selects an offshore wind farm as the research object. Based on the actual operation data of the wind farm and referring to the provisions of the national standard, the power quality (voltage deviation, voltage flicker, voltage fluctuation, harmonic) of the wind farm is solved. Based on the reactive power characteristics of wind turbines, this paper studies the reactive power compensation capacity of an offshore wind farm connected to the power grid public substation. In terms of power quality calculation and analysis, the limit value and actual value of some indicators of voltage deviation, voltage flicker and voltage fluctuation shall be calculated and compared with relevant regulations; Through the harmonic analysis module in ETAP software, the actual value of harmonic index is obtained through harmonic simulation, and compared with the limit value of theoretical calculation. When the harmonic current exceeds the national standard, a single tuned filter is connected to the bus for harmonic control to meet the relevant requirements of power quality.