一种基于谐波阻抗值的谐波源定位算法

为了明确谐波污染责任,提出一种基于谐波阻抗值的谐波源定位方法。以IEC61000-3-6对谐波发射水平的定义为依据,估算出系统侧的谐波阻抗,然后计算用户的谐波电压发射水平,不管三相电压和电流是否对称,该方法都适用;最后,通过一个110 kV的非线性用户系统测试数据验证该方法的准确性,并通过在实验室搭建物理仿真电路验证了谐波源定位算法的可行性。仿真结果表明:该算法能实现精确的谐波源定位,识别扰动来自于电网还是用户,明确划分谐波污染责任。

A Kind of Harmonic Source Positioning Algorithm Based on Harmonic Resistance Value

For defining harmonic pollution duties,this paper proposes a kind of harmonic source positioning method based on harmonic resistance value.Taking definition of IEC 61000-3-6 harmonic emission level as basis,it estimates harmonic resist-ance at the side of system and calculates harmonic voltage emission level of the customer.No matter whether the three-phase voltage and current are symmetrical or not,it proves that this method is applicable.At last,by some 1 1 0 kV non-linear cus-tom system testing data,it verifies correction of this method and by establishing physical simulation circuit in laboratory,it verifies feasibility of harmonic source positioning algorithm.Simulation result indicates that this algorithm is able to realize precise harmonic source positioning,distinguish source of disturbance and definitely divide harmonic pollution duties.