Power grid dynamic observing method based on PMU (power management unit) data

Abstract

The invention provides a power grid dynamic observing method based on PMU (power management unit) data. On the basis of PMU point distribution optimizing and in combination with the network topology information after EMS/SCADA (energy management system/supervisory control and data acquisition) state estimation, dynamic observation of the whole power grid can be achieved, and complete, reliable and real-time information is provided for a power grid advanced application analyzing function. In combination with C/S and B/S architectures, the dynamic monitoring and analyzing results are visually displayed to a dispatcher in a two-dimensional or three-dimensional manner to assist decision making. The method has the advantages that a power grid modal analysis method is combined, the coupling relation of active power and voltage phase angle is considered, the minimal dominating set algorithm is used, and the realized PMU point distribution method can actually and accurately reflect the stable weak areas of the current power grid; the EMS/SCADA data after state estimation is analyzed and correlated with PMU configuration data in a mapping manner to form mixed data, and reliable and accurate data source is provided for subsequent analysis.

Description

technical field [0001] The invention belongs to the technical field of electric power systems, and in particular relates to a method for dynamically observing power grids based on PMU data. Background technique [0002] With the formation of large-scale interconnected power grids, the capacity and scale of power grids continue to expand, and the complexity of system dynamic processes is increasing. In recent years, the WAMS system can obtain the real-time steady state and dynamic information of each node under the same time coordinates, and has high precision, synchronization and accuracy, which provides new means and methods for the dynamic analysis and control of interconnected power systems. perspective. [0003] Therefore, in order to realize the synchronous monitoring of the power grid and analyze the dynamic process, physical process and stability of the power system; on the one hand, it is necessary to monitor the electrical state quantities such as voltage and curre...

AI Technical Summary

Problems solved by technology

[0004] At present, the theory and engineering application of the power grid dispatching automation system (EMS / SCADA system) are relatively mature. It mainly focuses on the monitoring of the steady-state operation of the power grid, and cannot meet the requirements of the dynamic monitoring process. The data type and refresh frequency of the wide-area measurement system , transmission rate and information processing capability enable it to provide dynamic information of the power system, but the EMS system has a large amount of information, which is also the weakness of the current WAMS. Therefore, the data exchange between the wide area measurement system and the SCADA system can make The advantages of the two systems complement each other, how to realize the dynamic and considerable PMU data, so as to improve the monitoring level of the entire power grid, is an urgent problem to be solved

Images