摘要
同塔多回输电线路电流不平衡多由同塔线路之间互感引起。为分析短距离同塔多回输电线路电流不平衡对电网运行的影响,以同塔四回输电线路为例,基于EMTP软件搭建同塔四回输电线路仿真模型。对比不同运行方式下仿真数据与实测数据,验证所建模型的正确性。通过逐渐增大负荷电流、改变合闸角的方法,计算线路负序电压不平衡度。计算结果表明:轻负荷状态下,线路负序电压不平衡度较大,随着电流逐渐增大,负序电压不平衡度减小。当线路输送电流达到210 A时,负序电压不平衡度小于2%,满足国标要求。
Unbalanced degree in multi-circuit transmission lines on same tower is mainly caused by the mutual inductance in the transmission line. This paper takes the quadruple-circuit transmission lines as an example, puts up the simulation model based on EMTP to study the effect of unbalanced degree on power grid. The correctness of the simulation model is verified by comparing with the measured data and the simulation data. Negative sequence voltage unbalanced degree of transmission lines is calculated by creasing the load current and changing the initial fault current angle. Calculation results show that the current unbalanced degree is larger under light load. With the load current increases, the current unbalanced degree is reducing. The negative sequence voltage unbalanced degree can meet the national standard when the transmission line current reaches to 210 A, and the negative sequence voltage degree is less than 2%.
出处
《内蒙古电力技术》
2017年第4期40-43,共4页
Inner Mongolia Electric Power
关键词
同塔四回输电线路
合闸角
不平衡度
负序电压
quadruple-circuit transmission lines on same tower
initial fault current angle
unbalanced degree
negative sere.ca voltage
