Harmonic wave identification method and device, electronic equipment and storage medium
An identification method and an identification device technology, which are applied in the field of electric power and can solve problems such as converter off-grid
Pending Publication Date: 2021-03-02
CRRC DALIAN R & D CO LTD
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Problems solved by technology
[0005] The present invention provides a harmonic identification method, device, electronic equipment and storage medium, which are used to solve the existing technical problem of only identifying fixed-frequency harmonics and causing converters to go off-grid
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[0051] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0052] With the large-scale development of new energy power generation, the disconnection of converters caused by harmonics has a huge impact on the operation of wind farms. In order to avoid the converter off-grid caused by harmonics, it is first necessary to identify the harmonics in the grid. However, in the prior art, the voltage waveform in the fault record is usually analyzed after disconnecting from the grid, and the harmonic frequency at the time of th...
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The invention provides a harmonic wave identification method and device, electronic equipment and a storage medium. According to the harmonic wave identification method, a voltage signal of a to-be-detected power grid is acquired, a detection coefficient is determined according to the voltage signal and a preset detection coefficient list, a harmonic signal is extracted according to the voltage signal, the detection coefficient and the preset detection algorithm, and if the harmonic effective value of the harmonic signal is greater than or equal to the preset threshold, the harmonic frequencyof the harmonic signal is calculated, and a to-be-tested power grid is controlled according to the harmonic frequency. According to the harmonic wave identification method provided by the invention, real-time identification of the harmonic can be realized, and then the to-be-tested power grid is controlled, so that converter off-grid caused by the harmonic is avoided, and the stability and safetyof normal operation of a wind power plant system are improved.
Description
technical field [0001] The present application relates to electric power technology, in particular to a harmonic recognition method, device, electronic equipment and storage medium. Background technique [0002] At present, with the large-scale development of new energy power generation, the off-grid of converters caused by harmonics has a huge impact on the operation of wind farms. For example, sudden large-scale shutdown may damage some devices. There is a high probability of damage to the converter due to a flow fault. Considering the safety and stable operation of wind farms, it is very important to solve the problem of disconnection caused by grid voltage harmonics. [0003] To solve this problem, an important step is to identify the harmonics in the power grid to control them, so as to solve the problem of converter off-grid caused by harmonics. In the prior art, the identification of harmonics in the power grid is usually to obtain the harmonic frequency by analyzin...
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Login to View More IPC IPC(8): G01R19/165G01R23/16G01R19/00
CPCG01R19/0084G01R19/16576G01R23/16
Inventor 宋君健周鹏李韵楠王乃福
Owner CRRC DALIAN R & D CO LTD