Novel grid code allows heavy penetration of wind electric power into the grid which leads to new challenges of power quality like harmonic pollution in variable speed wind turbines with asynchronous generator. The article provides an analysis of the existing methods for identifying wind farm contribution to harmonic distortion at a point of common coupling. The considered methods do not allow correct and fair determining of the source of harmonic distortions, or they have limited application and difficulties in implementation. The paper proposes new methods for determining the source of high harmonics. A wind farm model is prepared using MATLAB software, and harmonic analysis is described for different wind velocities. Causes of harmonics generation in wind farm and harmonics pollution mitigation by DSTATCOM modeling with unbalanced grid disturbance of grid side wind mill inverter have been mentioned. The custom power device (CPD) is developed based on nature of harmonics and interface with grid-connected wind farm to enhance the power quality of wind farm. Results obtained from MATLAB-based harmonic analyses are compared with practical case study results that have been presented as per IEEE standard 519-1992, IEC 61000-2-2 and EN 50160 standard harmonic limits. Identified indirect current control scheme of custom power device can be supported to uncertainty analysis.

新颖的电网规范允许风电大量渗透到电网中，从而带来了电能质量的新挑战，例如带有异步发电机的变速风力涡轮机中的谐波污染。本文分析了在公共耦合点识别风电场对谐波失真的影响的现有方法。所考虑的方法不能正确，公正地确定谐波失真的来源，或者它们的应用范围有限且难以实施。本文提出了确定高谐波源的新方法。使用MATLAB软件准备了一个风场模型，并描述了针对不同风速的谐波分析。提出了风电场逆变器不平衡电网扰动的DSTATCOM模型在风电场中产生谐波的原因和减轻谐波污染的措施。定制电源设备（CPD）是根据谐波的性质而开发的，并与并网风电场接口，以提高风电场的电能质量。将基于MATLAB的谐波分析获得的结果与根据IEEE标准519-1992，IEC 61000-2-2和EN 50160标准谐波限值提出的实际案例研究结果进行比较。确定的定制功率器件间接电流控制方案可以支持不确定性分析。定制电源设备（CPD）是根据谐波的性质而开发的，并与并网风电场接口，以提高风电场的电能质量。将基于MATLAB的谐波分析获得的结果与根据IEEE标准519-1992，IEC 61000-2-2和EN 50160标准谐波限值提出的实际案例研究结果进行比较。确定的定制功率器件间接电流控制方案可以支持不确定性分析。定制电源设备（CPD）是根据谐波的性质而开发的，并与并网风电场接口，以提高风电场的电能质量。将基于MATLAB的谐波分析获得的结果与根据IEEE标准519-1992，IEC 61000-2-2和EN 50160标准谐波限值提出的实际案例研究结果进行比较。确定的定制功率器件间接电流控制方案可以支持不确定性分析。