智能变电站稳定控制装置数字采样的设计与实现

在智能变电站中,电网安全稳定控制装置作为跨间隔设备,需要同时接收、处理多个间隔的采样量。针对稳定控制装置“直采”模式下多间隔采样同步问题,提出了基于本地时标的同步和重采样插值合并处理的方法。以本地时标为基准,借助系统提供的辅助时钟,以重采样间隔对采样数据进行同步和线性插值重采样,并对线性插值误差进行分析。最后,依托FPGA+DSP硬件平台实现了稳控装置的数字化采样,并搭建试验系统,从采样精度和同步有效性方面对文中提出的基于本地时标的同步重采样插值算法的时效性和可行性进行验证,试验结果验证了基于本地时标的同步线性重采样方法能够满足稳定控制装置实际工程对实时性和精度要求。

Stability control device digital sampling in smart substation

In smart substation, the stability control device as a cross-interval device needs to receive and process a plurality of spaced sampling quantities simultaneously. Aiming at the problem of multi-interval sampling synchronization in "direct sampling ", this paper proposes a synchronization and resampling interpolation combining processing method based on local time scale. In this paper, the message time stamp is used as the stability control device in the "direct sampling " for multi-interval sampling synchronization and resampling reference. With the auxiliary clock, the sampling data is synchronized, resampling by linearly interpolated and analyzed the interpolation error. Finally, the digital sampling of the stability control device is realized by FPGA+DSP hardware platform, and the experimental system is built. The timeliness of the local time-scale based synchronization interpolation algorithm proposed in this paper is analyzed from the aspects of sampling accuracy and synchronization effectiveness. The feasibility is verified. The test results verify that the synchronous linear resampling based on local time scale can meet the real-time and accuracy requirements of the actual engineering of the stability control device.