基于瞬时值比较的PMU动态性能在线评测方法及系统

Instantaneous value comparison based PMU dynamic characteristics evaluation method and system

同步相量测量单元(PMU)的动态性能,是广域测量系统(WAMS)的各项高级应用可靠性的重要基础。提出一种基于大扰动的特征动态时段的瞬时值比较的PMU动态性能评测方法。将PMU相量数据还原为相量暂态录波数据,获取对应的实际暂态录波数据,分析两者在相关性、相量算法快速响应、纯幅值缩放和总体相似性上的差异,对PMU动态性能进行全面定量的评价。采用实际现场PMU数据验证了上述理论分析的正确性和可行性。此外,设计了在线评测系统,可应用于实际电网运行过程中实时监控和评价PMU动态性能。

The dynamic characteristics of phasor measurement unit is the important base of the reliability of advanced applications of wide area measurement system. The paper proposes a PMU dynamic characteristics evaluation method based on instantaneous value comparison during featured dynamic period of great disturbances. The method restores phasor data to instantaneous sampling data, obtains real sampling data from fault recorder, and analyzes the differences in correlation, response speed of phasor algorithms, amplitude change and total similarity between instantaneous sampling data from phasor and instantaneous sampling data from fault recorder. The PMU dynamic characteristics can be roundly and quantificationally evaluated by the indexes. The theory has been proved correctly and feasibly by practical-environment PMU data. Furthermore, for practical application, the paper designs an online evaluation system, which provids realtime monitoring and systematic evaluation.