Intelligent substation sampling data quality comprehensive evaluation method and system

Abstract

The invention provides an intelligent substation sampling data quality comprehensive evaluation method and system, and the method comprises the steps: obtaining merging unit data, measurement and control device data and PMU data in a substation, and forming multi-source redundant three-phase measurement under a unified time scale in the substation; three-phase linear state estimation of the transformer substation is carried out by adopting three-phase measurement of multi-source redundancy in the transformer substation and real-time on-off states of a transformer substation model and a circuit breaker, and a state estimation problem is solved by using a weighted least square algorithm; and performing comprehensive comparison according to a state estimation result, detecting and judging whether bad data exist in the measurement quantity by using Chii-square, and identifying the most probable bad measurement quantity by using a maximum normalized residual LNR method to obtain a data quality comprehensive analysis result. Based on the multi-interval, multi-type and available sampling data in the existing integrated monitoring system in the substation, the quality analysis and comprehensive evaluation of the sampling data of the intelligent substation are realized, and the operation reliability of the substation is improved.

Description

technical field [0001] The invention relates to the technical field of smart substations, in particular to a method and system for comprehensively evaluating the quality of sampling data in smart substations. Background technique [0002] The rapid development of smart grid has promoted the scientific and technological progress of the grid and accelerated the application of new theories, new technologies and new equipment in the power system. Smart substation is one of the important contents of smart grid construction, and also the key "support point" of smart grid information interaction. Since my country began to study the smart grid, it has attached great importance to the research of smart substation technology and equipment and its application in the grid. [0003] There are a variety of information systems in smart substations, such as data acquisition and monitoring systems, online monitoring systems, fault recording systems, etc., each system is built independently,...

AI Technical Summary

Problems solved by technology

Although PMU has great advantages in technology, due to economic and technical constraints, PMU measurement points cannot achieve the observability of the entire power grid or the entire substation. How to make full use of existing measurement equipment with high data redundancy and integrity Good characteristics, and can effectively connect the technical advantages of PMU to monitor and identify bad data of power data, and achieve higher performance state estimation is a key issue in the field of power system state estimation.

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