Wide area measurement system adaptive time-delay compensation method

Abstract

A wide area measurement system adaptive time-delay compensation method relates to a time-delay compensation method. At present, for methods adopting prediction compensation, the duration of prediction time is directly set at a fixed value according to experience, the adaptation is poor, and the prediction compensation error is large. The method provided by the invention comprises the following steps of determining the time-delay duration of prediction compensation required by each PMU substation of a wire area measurement system; selecting a corresponding measurement signal according to needs, performing prediction compensation, performing pretreatment of the measurement signal, wherein the pretreatment comprises detection and processing of abnormal data in historical data, detecting whether abnormal data occur by calculating whether the measurement signal data change rate is suddenly changed or not, and replacing the abnormal data when the abnormal data are detected; and a step of performing prediction compensation of data of the selected measurement signal. The time-delay compensation method of the technical scheme is simple and reliable, the calculation data size is small, the prediction compensation error is small, and accurate prediction compensation is achieved.

Description

technical field [0001] The present invention relates to a time delay compensation method, in particular to a wide area measurement system time delay adaptive prediction compensation method. Background technique [0002] The wide-area measurement system solves the problem of high-precision phasor synchronous measurement, and puts forward new ideas for introducing wide-area control to solve low-frequency oscillation, stable control between interconnected power grids, etc. Therefore, it is of great significance to explore the influence of time delay compensation technology on WAMS control system. [0003] In the current wide-area measurement system, when performing delay compensation, one is to directly design a time-delay robust controller, by improving the stability margin of the system itself to the delay; the other is a prediction-based compensation method, by The measured signal is predicted, and the predicted value is used as the input of the wide-area damping controller...

AI Technical Summary

Problems solved by technology

For the method using prediction compensation, the length of prediction time is often set to a fixed value directly based on experience, and cannot adapt to changes in network delay

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