An early warning method for abnormal state of high-speed rail power quality based on dynamic threshold

Abstract

The invention relates to a high-speed rail power quality abnormal condition prewarning method based on a dynamic threshold. The method includes the following steps of (1) building a high-speed rail power quality prewarning index system, (2) collecting historical power quality data and traction load amount corresponding to the historical power quality data, (3) building a high-speed traction station power quality abnormal state prewarning reference database, (4) detecting a power quality prewarning index abnormal state during online monitoring and prewarning, and (5) prewarning the high-speed rail power quality abnormal state. By means of the historical power quality monitoring data, the high-speed rail traction station power quality abnormal state which is monitored in real time is prewarned, power supply and consumption parties can learn about the high-speed rail traction station power quality abnormal state, power quality potential risks can be found in advance, operation reliability and economical performance of a power grid are improved, and safe operation of the power grid is guaranteed.

Description

technical field [0001] The invention relates to the field of power quality analysis, in particular to a power quality monitoring method for power systems and power users, that is, a dynamic threshold-based high-speed rail power quality abnormal state early warning method. Background technique [0002] Power quality is a description of power supply technical indicators that are related to the safe and economical operation of the power system and can affect the normal production process and product quality of users. It involves three basic elements of voltage and current waveform shape, amplitude and frequency. From this we can see the importance of power quality to the safe and stable operation of power grids and power loads. [0003] Electrified railway has the advantages of fast speed, strong transportation capacity, long power supply distance, energy saving and cost saving, good traction performance, etc., so it has broad development prospects and is the development direct...

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Problems solved by technology

Therefore, under normal operation conditions, the same high-speed rail traction station can use the change of traction load to represent the daily load operation status and load volume, and the change of power quality is closely related to the load operation status and load volume. This is the PCC point of the high-speed rail traction station The establishment of the power quality reference transmission database and the early warning of the abnormal state of power quality at the PCC point of the high-speed railway traction station have laid the foundation; and the current research on the power quality of the electrified railway mainly focuses on the simulation of the electrified railway working conditions and the analysis of the monitoring data of the electric railway. The research on early warning technology of power quality abnormal state is relatively weak

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