电力工程技术2026，Vol.45Issue(1)：83-92,10.DOI:10.12158/j.2096-3203.2026.01.008
新型电力系统下母线比率差动保护改进算法
Improved algorithm for ratio differential protection under the new power system
摘要
Abstract
In the new power system,a large number of new energy sources and power electronic equipment are connected to the AC power grid.When a fault occurs in the busbar area,affected by the control strategy,the amplitude and angle of the fault current are controlled,and the harmonic content is high.As a result,the operating performance of the ratio differential protection declines.The basic principle of the traditional ratio differential algorithm is introduced,and the problems of the traditional ratio differential algorithm in the new power system are analyzed.An improved algorithm for ratio differential protection for busbar protection is proposed,which is not affected by the angle difference and harmonics of the fault currents.The current phasors of each bay with different angles are mapped to the same coordinate system.Then,the differential current and restraint current are calculated.The operating performance of the improved ratio differential algorithm is analyzed under internal and external faults of the busbar area and current transformer(CT)saturation during external faults.An improved logic for the ratio differential protection is proposed.The real time digital simulation(RTDS)test results compare the operating performance of the traditional ratio differential protection and the improved ratio differential protection.It is proved that the improved ratio differential protection enhances the operating sensitivity without reducing the reliability of protection.关键词
新型电力系统/传统比率差动保护算法/改进比率差动保护算法/电流角差/制动电流/电流互感器(CT)饱和Key words
new power system/traditional ratio differential protection algorithm/improved ratio differential protection algorithm/angle difference/restraint current/current transformer(CT)saturation分类
信息技术与安全科学引用本文复制引用
王风光,赵青春,程骁,丁杰,龚啸..新型电力系统下母线比率差动保护改进算法[J].电力工程技术,2026,45(1):83-92,10.基金项目
国家科技重大专项资助项目"提升受端电网稳定性的主动支撑型柔性直流示范工程"(2024ZD0800900) （2024ZD0800900）
