Complex power quality disturbance signal identification method

A power quality disturbance and disturbance signal technology, which is applied in the direction of measuring electric variables, measuring electricity, and measuring devices, can solve the problem of low recognition rate of multiple disturbance signals, and achieve the effect of preventing misclassification

Inactive Publication Date: 2014-09-10
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

Although some composite power quality disturbance identification methods have appeared at present, the recognition rate of these methods for multi-disturbance signals is still relatively low, so it is of great practical significance to invent a composite power quality disturbance identification method with a higher recognition rate.

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Embodiment Construction

[0035] The technical solution of the present invention will be described in detail below in combination with the embodiments and the accompanying drawings.

[0036] In order to realize the automatic identification of composite power quality disturbance signals, according to the attached figure 1 As shown in the flowchart in , the following specific steps need to be taken:

[0037] Step 1. Power quality disturbance signal acquisition:

[0038] Because the sampling signal category of the actual power system is single and it is not easy to obtain a large number of samples, it cannot fully reflect the diversity of power quality disturbance signals. Therefore, use MATLAB software to randomly generate the above 24 kinds of power quality disturbance signals, each disturbance signal randomly generates 200 samples, and each sample is superimposed with 40dB Gaussian white noise, the sampling rate is 3.2kHz, and the sampling period is 20 cycles, that is The signal length is 1280 points...

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Abstract

The invention relates to the technical field of power quality analysis and monitoring, and mainly relates to high-identification rate complex power quality disturbance signal identification method based on multiple features. Power quality signals acquired by monitoring equipment of a power quality monitoring point is used to serve as a to-be-identified disturbance signal type, that is, input of an automatic identification system, and the type of the disturbance signals is outputted through automatic identification. According to the method, multiple kinds of single disturbance existing in the power system can be identified, multiple kinds of complex disturbance can be precisely identified, an auxiliary decision is provided for management and governance on the power quality, and important practical significance is provided.

Description

technical field [0001] The invention belongs to the technical field of power quality analysis and monitoring, and in particular relates to an identification method of a composite power quality disturbance signal. Background technique [0002] With the rapid development of industrial technology, a large number of non-linear, impact and unbalanced loads such as steelmaking electric arc furnaces, electrified railways, and power electronic devices have been put into use in power systems, resulting in voltage sags and transient voltages in distribution networks. A series of power quality problems that need to be paid attention to, such as voltage rise, voltage fluctuation, harmonics, voltage gap, pulse and oscillation transient interference. Power quality pollution can easily lead to increased system loss, increased measurement error of meters, malfunction of relay protection devices, greatly reduced life of compensation capacitors, computer crashes or data loss, unpredictable lo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R23/16
Inventor 张葛祥赵俊博刘德建
Owner SOUTHWEST JIAOTONG UNIV
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