基于区间约束的谐波溯源方法

Harmonic source tracing based on interval constraints

提出一种基于区间约束的公共连接点(PCC)主谐波源溯源方法。以系统侧和用户侧对PCC处谐波电压贡献度的大小作为判断两侧谐波源作用大小的判据,分析两侧谐波电压贡献度随谐波电压电流夹角的变化规律,将测量夹角划分为不同区间,推导出各区间严格不等式约束条件,分别得到判断系统侧和用户侧为主谐波源时的区间约束。利用可信区间去除异常测量数据,提高溯源结果的可靠性。对不同场景实测数据进行谐波溯源分析,结果验证了所提方法的有效性。

A method based on the interval constraints is proposed to trace the main harmonic source of PCC（Point of Common Coupling）. The system-side and customer-side harmonic voltage contributions of PCC are used as the criteria to compare the harmonic source effect between two sides. The variation of harmonic voltage contribution along with the angle between harmonic voltage and current is analyzed for both sides,the measured angle is divided into several intervals,the strict inequality constraints are derived for each interval,and the interval constraints for identifying the system-side or customer-side as the main harmonic source are obtained respectively. The confidence interval is adopted to remove the abnormal measurement data for improving the reliability of harmonic source tracing. Harmonic source tracing is carried out based on the measured data of different scenarios and results verify the effectiveness of the proposed method.