凸极发电机绕组故障瞬变过程仿真的支路分解组合法

Branch Decomposition and Constitution──The Transient Simulation for Winding Faults of Salient - Pole generators

以工程应用为背景，研究多分支绕组大型水轮发电机定子绕组故障瞬变过程的数值仿真方法。定子绕组发生故障后，绕组对称性遭到破坏，传统的变换方法难以应用；若按各支路列写方程，则方程维数过高，而且收敛也比较困难。本文提出支路分解组合法，以独立支路计算参数；同时归并健全分支，降低方程维数，进而建立完整的数学模型。测试结果表明，用该方法研究快速继电保护特性及现场事故分析能够满足工程要求。

The paper presents a new method, called branch decomposition and constitution (BDC), for digital transient simulation of winding faults of salient-Pole generator with multi-branch stator windings. As the asymmetry and a shorted loop of stator winding are caused by a internal fault, the conventional transformnation can not directly be used. The key points of the BDC methed are calculating parameters based on every single branch and constituting the normal baanches as one equivalent branch to reduce equation dimensions. Simula tion results show that the BDC methed is a good way for relay protection design and fault analysis in engineer ing application.