【摘要】 由于柔性多状态开关(soft normal open point, SNOP)复杂的控制策略及其弱馈特性，传统配电网故障定位方法难以适用于柔性互联配电网(flexible distribution network, FDN)。因此，文中提出一种利用电流正序分量波形相似性进行FDN故障区段定位的方法。首先，针对SNOP的典型控制策略，分析FDN的短路故障特征。其次，计算配电网中不同故障位置电流正序分量的Tanimoto系数，通过对比不同位置的电流正序分量波形相似性，构建FDN短路故障定位判据，并通过Teager能量算子(Teager energy operation, TEO)实现故障时刻的精确定位，利用智能配电终端(smart terminal unit, STU)传递信息。最后，通过建模仿真对所提方法进行分析验证，结果表明该方法能够对故障区段进行准确定位，不受故障位置、故障类型、过渡电阻、采样频率及通信延时等因素的影响，验证了该方法的可行性与有效性。更多还原

【Abstract】 Because of the complex control strategy and weak feed characteristics of soft normal open points(SNOP),traditional fault location methods of distribution networks are no longer applicable to flexible distribution network(FDN). A method for fault location in FDN using waveform similarity of positive-sequence current component is proposed. Firstly, considering the typical control strategy of SNOP,the short-circuit fault characteristics of FDN are analyzed. Secondly, Tanimoto coefficients of positive sequence current component at different locations are calculated. By comparing the waveform similarity at different locations of positive sequence current component, a short circuit fault location criterion for FDN is constructed. The Teager energy operator(TEO) is used to accurately calibrate the fault time, and smart terminal units(STU) are used to transmit information. Finally, the proposed method is analyzed and verified through modeling and simulation. The results show that the proposed method can accurately locate the fault section, and has the ability to resist the influence factors such as fault location, fault type, transition resistance, sampling frequency and communication delay, which verifies the feasibility and effectiveness of the proposed method.更多还原