Monitoring method and system of power system oscillation under time lag and loss of wide area measurement data

Abstract

The invention discloses a monitoring method and a system of power system oscillation under time lag and loss of wide area measurement data. The method comprises the steps of disturbance start judgment, data correction processing, data substitution processing and state evaluation and analysis. A disturbance start judgment module roughly judges whether a monitored power system has suspected oscillation; for power angle monitoring data of the suspected oscillation, a data correction processing module performs data preprocessing on a sampling value; for power angle monitoring data of data time lag or data loss, a data substitution processing module provides substitution data based on an electric coupling strength relation; and finally, a state evaluation and analysis module analyzes an oscillation mode of the power system by a classic Prony analysis method. The method can effectively improve the monitoring robustness of the power system oscillation, and is high in practicability.

Description

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AI Technical Summary

Benefits of technology

The technical effect of this patented technology is that it allows for better control over electricity systems by analyzing signals from multiple sensors simultaneously during different stages or phases of operation. This helps prevent issues such as delayed measurements caused by changes made after they have been completed (such as equipment failure). By performing these analysis with data preprocessed beforehand, weak correlations are replaced with stronger ones, resulting in more accurate results compared to previous methods. Overall, this innovative approach improves efficiency while maintaining its reliability even when there may be delays between measuring certain parameters accurately enough.

Problems solved by technology

This patents describes an issue with current methods used during voltage monitoring due to poor control over electrical equipment's operation near critical points where they can affect their safe functioning. These issues include fluctuating frequencies at high voltages, delayed responses between multiple components, and potential changes in phase angle values associated with impedances.

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