交直流混联电网工频变化量距离保护动作特性分析  

Performance Analysis of Distance Protection Based on Industrial Frequency Variation Applied to AC-DC Hybrid Power Grid

作　　者：张健康[1,2] 索南加乐[1] 何方明[1] 粟小华 汪宁渤[3] 马彦宏[3] 

机构地区：[1]西安交通大学电气工程学院,陕西省西安市710049 [2]西北电网有限公司,陕西省西安市710048 [3]甘肃省电力公司风电技术中心,甘肃省兰州市730050

出　　处：《电力系统自动化》2013年第4期98-103,共6页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(50677051;50877061);国家重点基础研究发展计划(973计划)资助项目(2009CB219704)~~

摘　　要：分析了交直流混联电网中工频变化量距离保护的动作特性。换流站附近交流线路发生故障时,由于控制系统的快速调节,直流侧对外表现为弱电源系统,具有弱馈的特点。工频变化量距离保护的动作范围与系统等值阻抗和整定阻抗之比有关,该比值越大,保护动作范围就越小。因此,直流系统的存在会造成工频变化量距离保护动作范围大幅缩小甚至没有保护范围。最后,以实时数字仿真器试验数据验证了理论分析的正确性。The performance of the distance protection based on industrial frequency variation in an AC-DC hybrid power grid is discussed. When faults occur on the AC transmission lines close to the converter station at the receiving or sending end, due to the impact of control system, the DC system has characteristics of a weak power source and its equivalent impedance is significant. The operation range of distance protection is closely related to the ratios of system equivalent impedance and setting impedance, and the smaller of the ratios, the larger of the protection operating range. Therefore, the operating range of distance protection reduces greatly and it can lead to the under-reach and even operating failure of the protection. Finally, the correctness of theoretical analysis is verified by the real time digital system experiment data.

关 键 词：交直流混联电网 直流输电 工频变化量 距离保护 

分 类 号：TM921.51[电气工程—电力电子与电力传动]