配电网综合负荷机理模型闭环辨识研究

电力系统具有天然闭环特性，在激励信号注入位置与辨识用信号量测位置不同时，负荷模型参数辨识可能具有较为明显的闭环特征。文章以台区模型辨识场景为例，研究了闭环条件下负荷机理模型参数辨识问题。通过对比分析常见的闭环辨识方法，总结了实现机理模型闭环辨识需满足的基本条件，并依据该条件选择了无需反馈通道模型先验知识且可直接辨识原系统模型的两阶段辨识法。对台区负荷动态机理模型进行线性化处理和模型转换，并将其嵌入两阶段辨识的第二阶段，可以实现机理模型参数的在线闭环辨识。通过仿真分析，验证了负荷辨识的闭环特性以及所提两阶段辨识方法的有效性。

Research on integrated load mechanism model closed-loop identification of distribution network

Power system has natural closed-loop characteristics. The load model parameters identification based on measurement signals has obvious closed-loop characteristics when the injection position of excitation signals is different from the measurement position of identification signals. In this paper, the identification of load mechanism model parameters under closed-loop condition is studied by taking the distribution area modeling scenario as an example. Through the comparison and analysis of common closed-loop identification methods, the basic conditions for closed-loop identification of mechanism model are summarized. Based on this condition, a two-stage identification method which can directly identify the original system model without prior knowledge of feedback channel model is selected .At the second stage of two-stage identification method, the load mechanism model is linearized and converted into a discrete transfer function form to realize the online identification of mechanism model parameters. Through simulation analysis, the closed-loop characteristics of power system modeling and the effectiveness of the proposed two-stage identification method are verified.