【摘要】：快速準(zhǔn)確地選出故障線路對(duì)電網(wǎng)安全穩(wěn)定運(yùn)行有重大意義,鑒于此,分析了小電流接地系統(tǒng)發(fā)生單相接地故障時(shí)的暫態(tài)特征,并針對(duì)目前采用暫態(tài)量的故障選線方法的不足,將原子分解法應(yīng)用到故障暫態(tài)零序電流的分析中。提出了基于粒子群優(yōu)化算法(PSO)改進(jìn)原子分解法的自適應(yīng)選線算法,通過(guò)引入原子分解能量熵和衰減直流分量放大系數(shù),計(jì)算暫態(tài)電流中衰減直流分量和自由振蕩分量的能量比,從中選擇最優(yōu)的暫態(tài)信息用于選線。經(jīng)MATLAB仿真表明,當(dāng)故障合閘角≥45°時(shí),利用各線自由振蕩分量的特征能有效選線,在故障合閘角45°或過(guò)渡電阻≥100?故障情況下,均可利用各線衰減直流分量的特征實(shí)現(xiàn)故障選線,同時(shí),該方法可以有效識(shí)別母線故障,表現(xiàn)出了一定的自適應(yīng)性和較強(qiáng)的魯棒性。
[Abstract]:Selecting fault lines quickly and accurately is of great significance to the safe and stable operation of power network. In view of this, the transient characteristics of single-phase grounding fault in low-current grounding systems are analyzed, and the shortcomings of the current fault line selection method based on transient quantity are pointed out. The atomic decomposition method is applied to the analysis of fault transient zero sequence current. An adaptive line selection algorithm based on particle swarm optimization (PSO) improved atomic decomposition method is proposed. The energy ratio of attenuated DC component and free oscillation component in transient current is calculated by introducing atomic decomposition energy entropy and attenuated DC component magnification factor. The optimal transient information is selected for line selection. MATLAB simulation shows that when the fault closing angle is 鈮，

本文編號(hào)：2231932