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A Modeling Method for Delay Characteristics of Wide-area Measurement System

A wide-area measurement system and technology of delay characteristics, applied in the field of delay modeling, can solve the problems of ignoring the randomness of delay, difficult to accurately delay characteristics, etc., and achieve easy programming, accurate models, and simple delay measurement methods reliable effect

Active Publication Date: 2017-09-08
STATE GRID CORP OF CHINA +3
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Problems solved by technology

[0003] In the current wide-area measurement system, the time delay measurement is often based on the measurement under experimental conditions, and the measurement results are difficult to accurately determine the time delay characteristics under the actual operating conditions of the power system.
The research on the measured PMU information delay is mainly a simple analysis of single delay or fixed delay, and ignores the randomness of delay, and the modeling method of information delay is less involved

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Embodiment

[0069] In order to verify the effectiveness of the modeling method in the present invention, the WAMS time delay of the Zhejiang Provincial Power Grid was measured, and a mathematical model based on probability distribution was established. This example uses normal distribution, Rice distribution, Rayleigh distribution, Weibull distribution, etc. Four typical distributions were tested and the best model was selected.

[0070] According to the first step in the content of the invention, the time delay data of 75 PMU substations of the WAMS of Zhejiang Power Grid under actual operating conditions are obtained.

[0071] Using the bad data processing method in the second step, first check the data, directly eliminate the data of 4 sub-stations caused by the time stamp error of the PMU sub-station and the data of 5 sub-stations with serious communication congestion, and obtain 66 effective sub-station measurement data; For the four distributions selected in this example, when κ is ...

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Abstract

The invention provides a modeling method for time delay characteristics of a WAMS (wide area measurement system), relates to a time delay modeling method, and aims to solve the problems that in the conventional WAMS, time delay measurement is often based on experiment conditions, and a measurement result cannot accurately show the time delay characteristics of an electric power system under actual operation conditions. The modeling method comprises the following steps: 1), communication time delay between each PMU (phasor management unit) sub-station and a WAMS master station is calculated; 2), time delay data are preprocessed, on one hand, wrong PMU sub-station data or PMU sub-station data with serious communication blockage are removed, and on the other hand, large time delay data of normal PMU sub-stations are rejected; 3), preprocessed time delay data is subjected to frequency calculation; and 4), results fit by different probability density functions are compared by adopting quantitative indexes, and the optimum distribution function is selected. With adoption of the technical scheme, the method is simple, reliable, fast in processing and easy to implement, influence on the system is avoided, and an established model is more accurate.

Description

technical field [0001] The invention relates to a time delay modeling method, in particular to a method for modeling time delay characteristics of 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 introducing wide-area control to solve problems such as low-frequency oscillation and stable control between interconnected grids. The factors that must be considered in the design of the system controller have become a problem that cannot be ignored in the study of wide-area control. Accurate and effective delay models are of great significance for guiding delay compensation and exploring the impact of delay on WAMS control systems. [0003] In the current wide-area measurement system, the time delay measurement is often based on the measurement under experimental conditions, and the measurement results are difficult to accurately determi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
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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