交直流混合电网中变电站电容器组串联电抗率选择

对于传统的变电站电容器组设计配置,由于未考虑变压器饱和时的阻抗及谐波特性.可能会导致电珑容器组出现故障的情况.通过理论分析,提出设计选择电容器组的串联电抗率时,应考虑在不同条件下系统阻抗频率特性所对应的并联谐振点及系统可能出现的各次谐波分布特性.采用电磁暂态仿真软件PSCAD/EMTDC,以某变电站主变压器为例,考虑不同的变压器饱和程度、电容器组投切方式和电容器组串联电抗率条件,进行仿真及电容器组谐波电流计算.仿真结果说明,从电网安全运行出发.在考虑可能出现的变压器饱和情况时,应改变传统的电容器组设计配置方式.

Selection of series reactance ratio of substation capacitor banks in AC/DC hybrid power grid

The impedance characteristic and harmonic characteristic during transformer saturation are not considered in the traditional configuration scheme of substation capacitor banks,which may lead to capacitor bank fault. Based on the theoretical analysis,it is suggested that,the parallel resonance point corresponding to system impedance-frequency characteristic and the probable system harmonic distribution characteristic under different conditions should be considered for the series reactance ratio selection. A ...