CAJ | 학술논문

为提高直流牵引供电系统运行的可靠性，提出一种使用双端数据的故障测距算法。利用等效圆柱法求得牵引网各导体的暂态内阻抗，与外阻抗求和后作为各导体的阻抗。24脉波整流机组在短路初始阶段其等效内阻抗为恒定值，将整流机组视为电压源串联恒定电阻、电感的线性电路。利用叠加定理将故障网络分解为故障前网络和纯故障网络，以消除负荷电流对故障电流分量的影响，并对纯故障网络进行等效变换。使用双端数据对纯故障网络列写故障回路方程，其中电流的一阶导数用数值方法求出。利用最小二乘法求超定矩阵方程的最优解，得到故障点的位置。PSCAD仿真结果及模拟试验表明，该算法测距精度高，最大误差约为3％，且不受过渡电阻、线路参数及数据窗的影响。
위제고직류견인공전계통운행적가고성，제출일충사용쌍단수거적고장측거산법。이용등효원주법구득견인망각도체적잠태내조항，여외조항구화후작위각도체적조항。24맥파정류궤조재단로초시계단기등효내조항위항정치，장정류궤조시위전압원천련항정전조、전감적선성전로。이용첩가정리장고장망락분해위고장전망락화순고장망락，이소제부하전류대고장전류분량적영향，병대순고장망락진행등효변환。사용쌍단수거대순고장망락렬사고장회로방정，기중전류적일계도수용수치방법구출。이용최소이승법구초정구진방정적최우해，득도고장점적위치。PSCAD방진결과급모의시험표명，해산법측거정도고，최대오차약위3％，차불수과도전조、선로삼수급수거창적영향。
In order to improve the reliability of the DC traction supply system ,a fault location algorithm based on two-ended data was presented .The transient internal impedances of the various conductors of the traction system were obtained by using the equivalent cylindrical method ,the sums of the internal and external imped-ances were considered as the impedances of the various conductors .The equivalent internal impedance of the 24-pulse rectifier unit was a constant value at the initial stage after the short-circuit occurred ,so the rectifier u-nit was seen as a linear circuit .In order to avoid the effect of load currents ,the superimposed theorem was uti-lized to decouple the fault network to a pre-fault network and a pure fault network .And the pure fault network was simplified to an equivalent network .The two-ended data were used to write the equations of the pure fault network seen from the two-ended bus .The derivative of the currents was obtained with the numerical method . The least square method was used to find the location of fault by solving the overdetermined equations .The re-sults of PSCAD simulation and model tests show that the presented algorithm can accurately establish the loca-tion of fault with the maximum error about 3% and the algorithm is immune to the transition resistance ,the line parameters and the data window .