电力系统谐波阻抗估计的改进数据相关性方法

摘要

Accurate calculation of system harmonic impedance of the system is the key to determine the harmonic emission level. This paper presents a new method caled improving data correlation to compute the system harmonic impedance. Compared with the traditional data correlation method, the improved method introduces the phase angle compute the system harmonic impedance, and the harmonic impedance calculation is more accurate. On IEEE14 node system simulation to verify the change in the load impedance, load harmonic current changes, the system topology changes, improving data correlation method has better accuracy than traditional data correlation methods. The measured data show that the improved data correlation is more simple, accurate and easy to implement in engineering.%系统谐波阻抗的准确计算是确定谐波发射水平的关键。本文提出一种改进数据相关性方法估计系统谐波阻抗。相较于传统数据相关性方法，改进数据相关性方法引入相角，使谐波阻抗估计更准确。对IEEE14节点系统进行仿真验证，验证了在负荷阻抗变化、负荷谐波电流变化和系统拓扑结构发生变化三种情况下，改进数据相关性方法比传统数据相关性方法准确度更高。对实测数据验证，表明改进数据相关性更简单，准确，易于在工程中实现。