| Summary: | [Introduction] To fill the shortcomings of traditional on-line power quality monitoring system, such as high deployment cost, large maintenance workload, low coverage and single function, which are highlighted under the higher requirement of information and intellectualization for the rapid development of UHV grid and new energy grid-connected technology. [Method] A method of identifying, extracting and calculating power quality characteristic parameters based on fault recorder data mining was proposed, and a system architecture of non-intrusive power quality monitoring, evaluation and decision support for wide area power grid using existing recorders and dispatching data network was designed. [Result] The results of pilot application show that the power quality indicators monitored by the system are comprehensive, the acquisition accuracy is better than the standard requirements, and the accuracy of event recognition and diagnosis is high. It has obvious advantages in station coverage, capacity of monitoring points, file upload, early warning and information delivery. [Conclusion] The design of the system is feasible and can extend and supplement the existing power quality online monitoring system in wide area power grid with a small input.
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