稳定图法在极化等效电路参数辨识中的应用

Application of Stabilization Diagram Method for Solving Polarization Equivalent Circuit Parameters

交联聚乙烯(XLPE)电力电缆绝缘等效电路模型的参数辨识是评估其绝缘老化状态的关键。针对现有等效电路参数辨识方法的局限性,该文提出了一种基于稳定图和状态空间模型(SSM)算法的扩展Debye等效电路模型参数计算方法。首先,利用去极化电流数据通过SSM算法生成稳定图;然后,由稳定图中稳定轴的数量确定弛豫支路数;最后,利用SSM准确地计算出等效电路的唯一参数。仿真结果表明,该方法抗噪声能力强、精度高,克服了传统方法存在的问题。实例验证了该方法的可行性和有效性。

The parameter identification of equivalent circuit model for XLPE power cable insulation is critical to evaluate the aging status of XLPE insulation. To avoid the limitations of the existing methods, this paper presents a new approach based on stabilization diagram and SSM algorithm to calculate the parameters of extended Debye equivalent circuit model. Firstly, the stabilization diagram is created by the depolarization current data through SSM algorithm. Then, the number of relaxation branches is determined by the number of stability axis. Finally, the unique parameters of the equivalent circuit can be accurately calculated by SSM. The results of simulation show that the method has strong anti-noise ability and high accuracy, and overcomes the problems of traditional methods. Case study verifies the feasibility and effectiveness of the proposed method.