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An Adaptive Time Delay Compensation Method for Wide Area Measurement System

A technology of wide-area measurement system and delay compensation, which is applied in the field of delay-adaptive prediction and compensation of wide-area measurement system, to achieve the effect of simple and reliable method, avoiding the increase of prediction and compensation error, and accurately predicting and compensating

Active Publication Date: 2017-12-26
STATE GRID CORP OF CHINA +3
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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

Method used

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  • An Adaptive Time Delay Compensation Method for Wide Area Measurement System
  • An Adaptive Time Delay Compensation Method for Wide Area Measurement System
  • An Adaptive Time Delay Compensation Method for Wide Area Measurement System

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Embodiment

[0062] In order to verify the effectiveness of the predictive compensation method in the present invention, the WAMS time delay of the Zhejiang Provincial Power Grid was measured and statistically calculated; the statistical results were used to determine the time length of the predictive compensation, and the angular velocity in the PMU substation measurement signal was selected (or unit frequency) signal and tie line power signal have been predicted and compensated.

[0063] According to the first step of the present invention, the time delay data from each PMU sub-station to the WAMS master station is obtained by installing the delay analysis, prediction and compensation device in the PMU sub-station, and the average value μ of the time delay is calculated delay and mean square error σ delay , and further get the time length of prediction compensation ΔT predict .

[0064] The data is preprocessed by means of data preprocessing in the second step, and the angular velocity...

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

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J13/00
CPCY02E60/00Y04S10/16
Inventor 吴秋晗杨博魏路平李永杰占震滨江全元戚军
Owner STATE GRID CORP OF CHINA
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