同步发电机短路故障分析方法研究

为提高同步发电机励磁绕组匝间短路故障的诊断速度和精度,提出了一种基于“场路结合”算法的故障分析方法。首先,建立了同步发电机励磁绕组匝间短路故障的扩充多回路数学模型。在此基础上,利用有限元分析确定了电感参数表达式,将有限元分析所得电感参数代入回路电压方程即可实现场路结合分析。以1台凸极同步发电机作为平台,进行仿真和实验研究,数据对比表明:场路结合法不仅具有较高的准确度而且可以提高计算效率,可以为励磁绕组匝间短路保护提供依据。

Research on Analysis Method of Short Circuit Fault of Synchronous Generator

In order to improve the diagnosis speed and accuracy of inter-turn short circuit fault of synchronous generator excitation windings,a fault analysis method based on"field-path combination"algorithm was proposed.Firstly,the extended multi-loop mathematical model of the inter-turn short circuit fault of the excitation windings of synchronous generators was established.On this basis,the expressions of inductance parameters were determined by finite element analysis.Field-path combination analysis can be realized with substituting the inductance parameters obtained by finite element analysis into the circuit voltage equation.A salient pole synchronous generator was used as a platform for simulation and experimental research.The comparison of the data shows that the field circuit combination method not only has higher accuracy but also can improve the calculation efficiency,and can provide a basis for the protection of inter-turn short circuit of the excitation windings.