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Synchronous phasor calculation method and system for filtering noise

A synchrophasor and noise-filtering technology, which is applied in calculations, complex mathematical operations, and special data processing applications, etc., to achieve good real-time performance, fast calculation speed, and simple calculation process

Pending Publication Date: 2020-11-20
XUJI GRP +3
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Problems solved by technology

[0004] Aiming at the problem that the calculation of synchronized phasors is affected by noise, spectrum leakage and fences, the present invention provides a method and system for calculating synchronized phasors that filter out noise, which considers the dynamic behavior of the power system and is less susceptible to noise such as frequency offset and harmonics Interference; fast speed, meeting engineering practical requirements

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[0059] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0060]The purpose of the present invention is to provide a synchronized phasor calculation method capable of overcoming noise interference such as frequency deviation and harmonics. The main measurement principles are as follows:

[0061] The signal model of the power system is

[0062]

[0063] where A is the signal amplitude, f 0 is the system frequency 50Hz, Δf is the value of the signal offset system frequency, ...

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Abstract

The invention relates to a synchronous phasor calculation method and system for filtering noise. The method comprises the following steps: sampling a signal of a power system; windowing the sampling signal by adopting a two-week Hamming window; calculating a rotating phasor of the windowed signal relative to a rated frequency rotating coordinate system; constructing a unary quadratic equation by utilizing the three equally-spaced rotating phasors, and solving and obtaining a phasor z; obtaining a phase and a frequency of the signal and a conjugate phasor of the phasor z based on the phasor z;and correcting the rotating phasor based on the phase, the frequency and the conjugate phasor to obtain a synchronous phasor of the signal. Dynamic behaviors of a power system are considered, and themethod and system are not easily interfered by noise such as frequency offset and harmonic waves; the influence of noise on synchronous phasor measurement is effectively reduced; when the frequency ofthe system deviates from the rated frequency, the influence of spectrum leakage caused by fixed-interval sampling is reduced, and phasor and frequency measurement has high precision.

Description

technical field [0001] The invention relates to the technical field of power systems and automation, in particular to a method and system for calculating synchronized phasors for filtering out noise. Background technique [0002] With the continuous development of new energy technologies and the increasing demand for electricity, building a strong smart grid has become the future direction of development. As the core of the wide-area measurement system, the Phasor Measurement Unit (PMU) of the synchronous system is responsible for the tasks of raw data acquisition, measurement and transmission. The PMU algorithm with good performance can ensure power system monitoring, state estimation, relay protection and The correctness of the control is of great significance. [0003] At present, domestic and foreign scholars and some PMU manufacturers have proposed a variety of phasor measurement algorithms, such as discrete Fourier transform (Discrete Fourier Transform, DFT), various ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/11G06F17/14
CPCG06F17/11G06F17/141
Inventor 王莉朱云峰姚维强沈光敏王耀武石欣余高旺杨凯蔺立龚赟郑业兵
Owner XUJI GRP
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