高压直流输电系统直流保护整定预备量分析

Study on Setting Preparative Parameter of HVDC System Protection

基于电磁暂态仿真整定直流保护定值目前存在着容易遗漏故障量极限值、工作量偏大和整定自动化程度较低等缺点。针对这些影响保护定值合理性的现状,提出了直流保护整定预备量的定义,分析了系统运行方式和故障时刻对预备量的影响,进而提出了获取预备量的方法。基于上述研究设计了仿真研究直流保护定值的整定流程,并归纳了直流保护整定所涉及到的全部预备量。仿真结果表明:该方法可以在不遗漏极限值的同时合理地降低仿真计算量;按照设计的整定计算流程和归纳的整定预备量开展直流保护整定工作,可以显著降低工作量和提高自动整定程度,从而提高保护定值的合理性,有利于系统、规范地开展直流保护整定工作。

Currently,there are some drawbacks such as missing fallibility extremum of fault quantity,heavy workload and low level of automation setting when electro-magnetic transient simulation is used to calculate direct current（DC） protective settings.Aiming at eliminating the impact of those drawbacks on rationality of setting value,a definition of setting preparative parameter of DC protection is proposed.And the influence on it is analyzed from system operation mode and fault time,then a method how to obtain it is put forward.Furthermore,the setting flow chart for DC protection setting calculation with simulation is designed,and all setting preparative parameters for whole DC protective devices are included.Simulation results show that the method can reasonably reduce labor for setting calculation without miss limit values as well.And the setting of DC protective device with the proposed setting calculation flow chart can reduce the setting workload and raise the setting automation level greatly.The study can enhance the rationality of setting value and it is in favor of making the setting work of DC protection more normatively and systematically.