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针对行波在水轮发电机定子绕组槽部和端部的传播特征分别建立其暂态电路网络模型,提出应用小波理论对定子接地行波信息进行分析来确定故障点的位置。讨论了行波速度计算的数学模型和无需波速基于相模变换,由线模量和地模量确定接地点位置的算法,解释了小波分析提取行波信号的原理。在MATLAB 6．5环境中针对一台大型水轮发电机的参数进行建模,叠加等效电源对其定子接地行为进行仿真。由小波分解的行波高频部分对行波传播的时间特征进行确认,对波速已知和未知时的接地点定位算法进行比较分析,仿真结果分析表明了该方法应用于水轮发电机接地故障定位的合理性及可行性。
According to the propagation characteristics of traveling wave in stator winding slot and end of hydroelectric generators, the transient network model was established. The wavelet theory was applied to analyze the traveling wave information of stator to determine the position of the fault. The mathematic model of traveling wave velocity calculation and the algorithm of determining the position of grounding point by linear modulus and ground modulus are discussed based on the phase mode transformation without wave velocity. The principle of wavelet analysis for extracting traveling wave signal is explained. In the MATLAB 6.5 environment, the parameters of a large hydroelectric generator are modeled and the equivalent power supply is superimposed to simulate the stator grounding behavior. The time characteristics of traveling wave propagation are confirmed by the high frequency component of the traveling wave of wavelet decomposition. The comparison and analysis of the grounding point positioning algorithms with known and unknown wave velocities are carried out. The simulation results show that this method is applied to hydroelectric generator ground fault Positioning and feasibility of the feasibility.