长江大学学报（自科版）2022，Vol.19Issue(1)：110-117,8.
考虑逆变器接口电站的线路电流差动保护分析及对策
Analysis of the line current differential protection considering inverter-interfaced generation station and countermeasures
摘要
Abstract
Recently,the penetration of renewable energies in the transmission system has increased evidently,and this brings significant challenges for the existing protection systems.This paper focused on the line current differential protection in the power networks connecting to the inverter-interfaced generation station (ⅡGS).Combining the various fault control strategies popular in the inverter-interfaced generator (ⅡG),as well as the ⅡGS penetration level,the decoupled sequence control (DSC) scheme was developed during asymmetrical grid faults.Compared with the conventional non-decoupled control scheme,DSC is effective to eliminate the influence of second harmonic oscillations in the active power output and the DC-link voltage,meanwhile,the DSC is capable of emulating the fault behavior of SG,improving the system voltage stability and protection adaptability.Simulation verification based on the DIgSILENT/PowerFactory was carried out.Simulation results show that the current differential protection is in risk of weak sensitivity (or even malfunction)during non-grounded interphase faults under certain ⅡG fault control modes,but the sensitivity of line current differential protection can be improved by using DSC scheme.关键词
逆变器接口电站/线路电流差动保护/故障控制/负序控制Key words
inverter-interfaced generation station/line current differential protection/fault control/negative sequence control分类
信息技术与安全科学引用本文复制引用
马凯琪,王砚帛,陈哲..考虑逆变器接口电站的线路电流差动保护分析及对策[J].长江大学学报（自科版）,2022,19(1):110-117,8.基金项目
ForsKEL and EUDP project "Voltage control and protection for a grid towards 100％ power electronics and cable network (COPE) " (880063). （COPE）
