A Measurement Method of Fundamental Wave Parameters Based on Sliding Window Spectrum Separation

A parameter measurement and frequency spectrum technology, which is applied in the field of fundamental wave parameter measurement based on sliding window spectrum separation, can solve problems such as harmonic interference between power system signals, low estimation accuracy, and difficulties in dynamic monitoring of power frequency parameters

Active Publication Date: 2018-10-30
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

However, due to the use of a large number of power electronic equipment such as frequency converters, it will bring interharmonic interference to power system signals, which brings new difficulties to the dynamic monitoring of power frequency parameters.
However, the above method has a low estimation accuracy when the signal has interharmonics and is close to the fundamental wave in a short time window, and its practical application is limited.

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  • A Measurement Method of Fundamental Wave Parameters Based on Sliding Window Spectrum Separation
  • A Measurement Method of Fundamental Wave Parameters Based on Sliding Window Spectrum Separation
  • A Measurement Method of Fundamental Wave Parameters Based on Sliding Window Spectrum Separation

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Embodiment Construction

[0069] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0070] figure 1 Shown as a simulated grid voltage signal with varying fundamental and interharmonic components, the steps taken are:

[0071] 1. Signal collection

[0072] The voltage signal V or current signal I of the transmission and distribution network is collected for offline or online analysis, that is, the method of the present invention can not only analyze the real-time collected signal, but also dynamically analyze the historical signal of a certain period of time.

[0073] 2. Power signal modeling

[0074] 1), the single-frequency complex exponential model of the power system voltage or current signal is: where A p , f p and are amplitude, frequency and initial phase angle respectively;

[0075] 2), set the sampling frequency to f s , then the sampling interval Δt=1 / f s , then the continuous signal x p (t) afte...

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Abstract

The invention discloses a method for measuring fundamental wave parameters based on sliding window spectrum separation. Firstly, a power signal model is established, and then a spectrum separation method is deduced through short-time Fourier transform. Aiming at multiple frequency components separated by spectrum peaks, a method is designed. Determine the real frequency components to determine the conditions, and finally calculate and modify the fundamental parameters. The method of the invention can greatly reduce the interference of negative frequency components and interharmonic components to the fundamental wave, accurately extract the fundamental wave components, and obtain good parameter measurement accuracy; the analysis of noise-containing signals also shows that the algorithm has good noise resistance , suitable for power frequency dynamic measurement of power grid.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a method for measuring fundamental wave parameters based on sliding window spectrum separation. Background technique [0002] With a large number of measuring equipment such as synchrophasor measurement units and frequency disturbance recorders put into use in the power grid, the dynamic monitoring of the power system has become an important guarantee for the reliable operation and control of the power grid. Among them, the power frequency parameters of the power system are important indicators for the stable, efficient and safe operation of the power system, especially the frequency of the power system, which is crucial for evaluating the synchronous operation of the power grid and distributed motors. Therefore, fast and accurate estimation of power frequency parameters has important engineering practical value. [0003] Most of the existing fundamental wave parameter e...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/16
CPCG01R23/16
Inventor 臧天磊孙仲民何正友钱清泉
Owner SOUTHWEST JIAOTONG UNIV
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