Abstract: The variability of offshore wind resources leads to fluctuations in the power output of wind farms. Additionally, the presence of numerous power electronic components in wind turbines can result in power quality issues after the integration of offshore wind farms into the grid. This study selects a specific offshore wind farm as the research subject.Firstly, in accordance with national standards, the paper calculates the standard limits for power quality indicators, including voltage deviation, voltage flicker, voltage fluctuation, and harmonics. Then, based on the reactive power characteristics of the wind turbines, the paper investigates the reactive compensation capacity of the substation at which the offshore wind farm connects to the grid. Thirdly, using actual operational data from the wind farm, the paper calculates the actual values of voltage deviation, voltage flicker, and voltage fluctuation, and compares them with the theoretically calculated limits.Finally, the paper models the specific offshore wind farm using ETAP software and utilizes its harmonic analysis module for harmonic simulation and emulation. The simulated harmonic values are then compared with the theoretically calculated limits. When the harmonic current exceeds the national standard, harmonic mitigation is performed by connecting a tuned harmonic filter to the busbar, thereby improving the power quality of the wind power generated by the wind farm.