【摘要】 现阶段变压器油纸绝缘等效弛豫机构参数辨识多采用拓扑支路数任意假定、粒子群等智能算法对N组非线性方程组寻优迭代计算。其计算往往具有收敛性差、结果不唯一等问题,且难以从介质响应函数特性分析真实的油纸绝缘弛豫过程,影响后续弛豫参数对老化评估的准确性。基于此,提出一种应用数学解析法的变压器油纸绝缘弛豫机构参数辨识新方法。首先,从介质响应函数特性出发,深入挖掘弛豫项数信息,辨识油纸绝缘等效弛豫机构的拓扑结构;其次,公式推演得到参数辨识的数学计算公式,避免了智能算法对非线性方程组的寻优误差与不唯一性;最后,通过实例验证该方法的有效性与可行性,提出的数学解析法可为变压器油纸绝缘介质内部弛豫响应特性提供可靠的数学分析模型。更多还原

【Abstract】 Intelligent algorithms, such as the arbitrary hypothesis of topological branch numbers and particle swarm optimization, are generally utilized to identify the parameters of equivalent relaxation model in oil-paper insulation. However, the calculation has a poor convergence without an unique result. And it is difficult to analyze the relaxation process based on the medium response function, which affects the aging assessment accuracy of oil-paper insulation in turn. In this paper, a new method is presented to identify the relaxation parameters of transformer oil-paper insulation. Firstly, the amount of relaxation processes is analyzed based on the dielectric response characteristics of oil-paper. Secondly, the parameters are mathematically deduced to avoid the errors of intelligent algorithm. Finally, examples are given to verify the validity and feasibility of proposed method. This method provides a reliable mathematical model for the relaxation response characteristics of oil-paper insulation.更多还原