半波长交流输电线路贝瑞隆差动保护改进算法

Improved Bergeron Differential Protection Algorithm for Half-wavelength AC Transmission Line

半波长交流输电线路输送距离长、电压等级高,呈现出明显的分布参数特性,传统的继电保护原理不再适用。文中提出了一种高灵敏度、低灵敏度相配合的贝瑞隆差动保护改进算法,保护半波长交流输电线路的全长。其中低灵敏度贝瑞隆差动,用于保护半波长线路区内两端区域短路故障。高灵敏度贝瑞隆差动,用于保护半波长线路区内中间段区域短路故障。基于电磁暂态仿真软件PSCAD搭建特高压半波长输电线路仿真模型,并对提出的保护算法进行了大量的仿真实验。结果表明,低灵敏度贝瑞隆差动保护可以保证区内两端区域保护快速性,高灵敏度贝瑞隆差动保护可以提升区内中间段区域保护灵敏性。

Due to long transmission distance and high voltage grade, the half-wavelength AC transmission line （HWACT） shows obvious distributed parameter characteristics, so the traditional relay protection algorithm is no longer applicable. This paper proposes an improved Bergeron differential protection algorithm which can protect the whole area of HWACT. The algorithm consists of two different sensitivities of the differential protection. The low sensitivity of the differential protection is for the short-circuit faults at both ends, and the high sensitivity is for the shortcircuit faults in middle section. A simulation model of HWACT based on PSCAD is established to verify the algo- rithm. Simulation results indicate that the low sensitivity of the differential protection can ensure speedy protection, and the high sensitivity of the differential protection can improve the protection sensitivity.