The point of common coupling ( pcc ) is a bus which connects the customer and utility . the research of harmonics and its components at pcc is a valid way to distinguish the responsibility between customer and utility and to manage the harmonic producer 公共耦合节点（ pcc ）是联系系统和用户之间的那条母线，研究公共耦合节点处的谐波含量及其中的谐波成分是明确用户和系统责任所在以及管理产生谐波用户的一个行之有效的方法。
