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S conversion based SDPQD (Short Duration Power Quality Disturbance) signal identifying method, device and system

An identification method and signal technology, which is applied in the direction of measuring electrical variables, measuring devices, instruments, etc., can solve the problems of inability to identify complex disturbance signals of transient oscillations, and achieve the effect of high accuracy and simple identification process

Active Publication Date: 2012-07-25
NORTH CHINA ELECTRICAL POWER RES INST +1
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Problems solved by technology

[0031] The embodiment of the present invention provides an S-transform-based SDPQD signal identification method, equipment and system, which solves the problem that the identification method in the prior art can only identify simple disturbance signals, and cannot identify such as transient oscillations and short-term harmonics. The problem of complex perturbation signals such as

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  • S conversion based SDPQD (Short Duration Power Quality Disturbance) signal identifying method, device and system
  • S conversion based SDPQD (Short Duration Power Quality Disturbance) signal identifying method, device and system
  • S conversion based SDPQD (Short Duration Power Quality Disturbance) signal identifying method, device and system

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Embodiment approach 2

[0186] The first average similarity value determination means 2015 and the first signal identification means 2016 in the second embodiment are the same as the first average similarity value determination means 2015 and the first signal identification means 2016 in the first embodiment, and will not be repeated here .

[0187] Figure 10 It is a structural block diagram of a third implementation of an S-transform-based SDPQD identification device according to an embodiment of the present invention, consisting of Figure 10 It can be seen that the described SDPQD identification device 20 based on S transform comprises:

[0188] The second signal collection device 2021 is used to collect the SDPQD signal on the substation;

[0189] The second signal transforming device 2022 is used to perform discrete S transform on the collected SDPQD signal to generate a time-frequency matrix;

[0190] The second scaling device 2023 is configured to scale the time-frequency matrix;

[0191]...

Embodiment approach 4

[0226] The second average similarity value determination means 2025 and the second signal identification means 2026 in Embodiment 4 are the same as the second average similarity value determination means 2025 and the second signal identification means 2026 in Embodiment 3, and will not be repeated here .

[0227] The technical solutions of the present invention will be described in detail below in conjunction with specific embodiments. For the 8 types of standard time-frequency domain matrices preset in the SDPQD signal recognition equipment based on S-transform, each type of standard time-frequency domain matrix randomly collects 100 signal samples, a total of 800 signal samples, and calculates the 800 signal samples after S-transform The similarity between each disturbance feature matrix scaled by time-frequency scale and 8 types of standard time-frequency domain matrices. Table 2 lists the average similarity between 100 signal samples of each type of standard time-frequenc...

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Abstract

The embodiment of the invention provides an S conversion based SDPQD (Short Duration Power Quality Disturbance) signal identifying method, a device and a system. The method comprises the following steps: collecting SDPQD signals on a substation; performing dispersing S conversion on the collected SDPQD signals so as to generate a time frequency matrix; performing scaling on the time frequency matrix; confirming a similarity value of each row in the time frequency matrix according to a preset standard time frequency matrix; confirming an average similarity value of the time frequency matrix according to the similarity value of each row; and identifying the SDPQD signal according to the average similarity value of the time frequency matrix. The method provided by the invention is used for solving the problems of the identifying method in the prior art that only simple disturbance signals can be identified and the complicated disturbance signals, such as transient oscillation, short-time harmonic wave, cannot be identified.

Description

technical field [0001] The present invention relates to the field of power quality disturbances, in particular to the SDPQD signal identification technology, specifically an S-transform-based SDPQD signal identification method, device and system. Background technique [0002] With the development of science and technology and the national economy, users have higher and higher requirements for power quality. How to correctly identify various power quality disturbances has received more and more attention in the field of power quality research. [0003] In the prior art, there are mainly five methods for identifying power quality disturbances as follows: [0004] (1) Calculation method of sliding root mean square [0005] Take the half cycle of the measured voltage to calculate its root mean square value as a sample, which is counted as u, and the values ​​​​are taken sequentially to form n sample sequences, then the root mean square value is [0006] U ...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 蔡维杨洪耕锁娟王建伟邓春赵燕坤
Owner NORTH CHINA ELECTRICAL POWER RES INST
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