基于负荷等值阻抗参数的谐波责任划分方法

Harmonic Responsibility Division Method Based on Load Equivalent Impedance Parameters

针对传统谐波责任划分方法难以完全克服背景谐波与系统侧谐波阻抗等参数变化影响、缺乏对不同频次谐波责任的统筹考虑等不足,针对单母线下各馈线的谐波责任分摊问题,根据非线性负荷产生谐波的机理,提出了基于负荷等值阻抗参数的谐波责任划分指标。进一步地,针对目前负荷等值阻抗参数辨识方法存在因分母过零点而产生的异常值问题,提出两点式负荷阻抗参数估算方程,以实现三相对称负荷参数的准确辨识为谐波责任的划分奠定应用基础。最后,通过算例分析,验证了该方法的可行性与有效性。

The traditional harmonic responsibility division method is difficult to be fully immune to the variation of background harmonics and harmonic impedance of power system,and lacks the overall consideration of harmonics at different orders.To solve the above problems,according to the mechanism of harmonic generation,a harmonic responsi-bility division index based on load equivalent impedance parameters is proposed.The index can quantify the harmonic responsibility of each feeder under a single bus.Furthermore,a two-point load impedance parameters estimation method is proposed for three-phase symmetrical load that avoids the problem of abnormal value caused by zero crossing of de-nominator,which lays an application foundation for harmonic responsibility division.The feasibility and effectiveness of the proposed index and method are verified by example calculations.