基于输电线路分布参数电路模型的采样同步校准方法

Synchronized sampling calibration method based on distributed parameter circuit model of transmission line

针对输电线路存在的采样不同步问题,总结了现有处理方法的特点,提出了一种基于输电线路分布参数电路模型的采样同步校准方法。在系统正常运行时,线路基准端根据其电压电流采样序列,通过线路分布参数电路模型计算出线路同步端的电流,并将计算结果发送给同步端。线路同步端通过比较其采样电流序列与基准端传来的计算电流序列之间的相位,计算出同步端相对于基准端的采样偏差时间。此后同步端调整其采样脉冲输出,完成采样同步校准。仿真分析表明该方法能准确计算线路两端的采样偏差时间,验证了该方法的可行性。

The transmission line has the problem of non-synchronized sampling, so this paper summarizes the features of the existing methods in solving the problem and proposes a synchronized sampling calibration method based on the distributed parameter circuit model of transmission line. During normal operation of power system, the current on the sync side is calculated through the voltage and current sampling sequence on the reference side by the distributed parameter circuit model, and then the calculated current is sent to the sync side. The sampling bias between the reference side and the sync side is calculated by comparing the phase between the calculated current of sync side and its actual sampling sequence. And then the sampling pulse at sync side is adjusted, and the synchronous sampling correction of the sync side is completed. The simulation results show that the method can accurately calculate the sampling deviation, and the method of synchronized sampling calibration is feasible.