基于ETAP的海上风电场接入对电能质量的评估分析

Evaluation and Analysis of Power Quality of Offshore Wind Farm Access Based on ETAP

海上风资源的多变性会导致风电场的输出功率具有波动性,又因为风力发电机中存在较多的电力电子元器件,海上风电场并网后会产生电能质量问题。本文选取某海上风电场作为研究对象,首先依据国家标准计算电能质量指标的标准限值,包含电压偏差、电压闪变、电压波动和谐波;接着基于风机的无功特性,对某海上风电场接入电网变电站的无功补偿容量进行研究;然后基于风电场实际运行数据,计算电压偏差、电压闪变及电压波动的实际值,与理论计算的限值进行对比;最后基于ETAP软件对某海上风电场进行建模,利用其谐波分析模块进行谐波模拟仿真,得到谐波仿真值,并与理论计算的限值对比。当谐波电流超出国家标准时,通过在母线接入单调谐滤波器的方法,进行谐波治理,改善风电电能质量。

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.