直流系统单极运行对上海500kV电网的影响模拟及解决方案

Research on Simulation and Solutions of DC System Monopole Operation Impact on Shanghai 500 kV Grid

多条直流输电线路在中国东南部的负荷中心上海地区落地,给上海电网的发展注入了活力。虽然直流系统在长距离、容量输电方面有诸多优势,但直流系统单极运行时可能对上海电网的安全运行带来影响。基于此,针对上海地区主要直流系统单极运行时的地电位变化进行了仿真,并计算了各主要变电站的主变的直流偏磁电流水平,根据计算结果提出了相关解决方案。

Multiple DC transmission lines were rooted in Shanghai,the load center in Southeastern China,which had injected vitality into the development of the Shanghai Power Grid.Although DC system had many advantages in long-distance and capacity transmission,DC system monopole operation might have impact on safe operation of Shanghai grid.In the view of this point,the simulation was made on ground potential when main DC systems were on monopole operation,and the DC bias current level of main transformers in main substations was calculated.According to the results,the relevant solutions were proposed.