适用于换流器区保护定值校验的直流系统故障时刻选取方法

A Method to Choose Fault Time for Relay Setting Value Verification of Converter Protection in HVDC Systems

故障发生时刻的不同会影响到换流器区保护定值的正确选取,目前实际工程中采用的自然间隔选取故障时刻的方法存在对故障时间间隔长短较为敏感的问题。为此,该文从分析保护测点电气量暂态变化的角度入手,提出了适用于换流器区定值校验的直流系统故障时刻选取方法,给出了故障时刻选取的具体步骤,并提出该过程中需要重点关注的特殊时段。最后,仿真结果表明,该方法可以在保证精度的前提下,显著减少仿真的工作量。

The correctness of converter protection setting values can be influenced by the time of fault occurrence.The method of selecting the fault time based on natural periods,which is commonly utilized in engineering practice,has the disadvantage of being sensitive to the time interval.Therefore,this paper proposed a method to choose the time of fault occurrence for converter protection setting value verification,from the point of transient process of electrical variables.Concrete steps to implement the method,and the special time intervals that should be noticed,are given in the paper.It's demonstrated by the simulation results that without compromising the accuracy,workload can be significantly reduced with the proposed method.