论文部分内容阅读
带并联补偿输电线路单相瞬时性故障时,故障相恢复电压阶段会同时存在工频分量和低频分量,从而形成拍频现象。目前,基于上述原理的自适应重合闸判据抗干扰能力不强,且不能确定准确的熄弧时间。对此,文中采用一种新的信号处理方法——原子稀疏分解法分析非线性故障信号,以提取瞬时性故障时恢复电压阶段存在的低频分量,进而对故障性质作出判别;同时,原子稀疏分解法较强的时域和频域分析能力可以准确地确定故障熄弧时刻,为线路断路器的重合时刻整定提供依据。仿真实验验证了所述方法能够有效提高自适应重合闸性能。
Phase compensation with instantaneous single-phase transmission line fault, the phase failure voltage recovery phase there will be both frequency components and low-frequency components, resulting in the phenomenon of beat frequency. At present, the anti-interference ability of adaptive reclosing criterion based on the above principle is not strong, and the exact extinction time can not be determined. In this paper, we use a new signal processing method - atomic sparse decomposition method to analyze nonlinear fault signals to extract the low-frequency components of the recovery voltage phase of instantaneous fault, and then to judge the nature of the fault; At the same time, the atomic sparse decomposition The strong time-domain and frequency-domain analysis ability of the method can accurately determine the moment of arc fault and provide the basis for setting the coincidence moment of circuit breakers. Simulation results show that the proposed method can effectively improve the adaptive reclosing performance.