基于诺顿等效电路的多谐波源责任划分研究

摘要

明确区分多个非线性负载对电网公共连接点（ PCC）处的谐波贡献是实现多谐波源责任划分的重要问题。首先采用波动量法将单相不控整流谐波源等效为诺顿等效模型，并通过谐波电流源值与单相不控整流电路的各次谐波电流值近似相等证明了诺顿等效模型的有效性。然后搭建了含有三个谐波源的等效电路，并等效出各自的诺顿等效模型。最后利用等效阻抗计算出各非线性负载各次谐波电压值，利用电压表示的谐波责任指标因子进行多谐波源电压责任分摊。文中方法简单明了且有效，有利于实际配电网含多谐波源责任划分的工程应用。%A clear distinction to measure the harmonic contribution of the multiple nonlinear loads on point of common coupling of the power grid is important to achieve the division of responsibilities of the multi harmonic sources.This paper firstly uses the fluctuation method to transfer single phase uncontrolled rectifier circuit to Norton equivalent mod-el, and demonstrates the validity of the Norton equivalent model by comparing the value of harmonic current source and single-phase controlled rectifier circuit.Values of them are approximately equal.Then it sets up a circuit contains three harmonic sources and draws the Norton equivalent model of it.Finally, this paper calculates values of each har-monic voltage of every nonlinear load by using the equivalent impedance and uses voltage harmonic responsibility index factor dividing the responsibility of multi harmonic sources.This method is simple and effective, and it is also condu-cive to the practical application of distribution network with multi harmonic sources responsibility division.