A method, device and equipment for filtering out interference signals
A technology for filtering out interference signals, applied in mechanical equipment, measuring devices, safety devices, etc., can solve problems affecting the speed of steam turbines, cannot filter out power frequency interference signals, cannot completely filter out interference signals, etc., and achieve precise actual control Effect
Active Publication Date: 2021-02-09
ZHEJIANG SUPCON TECH
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[0004] However, the inventor found through research that there are many interference signals on the site of steam turbine power generation, and the interference signals will affect the speed signal of the steam turbine, resulting in the fact that the superimposed signal of the speed signal and the interference signal is actually used, and the signal in a short period of time is used for processing The method is high-speed sampling processing, which cannot completely filter out the interference signal, especially the low-frequency power frequency interference signal, so it is impossible to obtain the accurate speed of the steam turbine, which will affect the actual control of the speed of the steam turbine.
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[0046] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is a part of embodiments of the present invention, but not all embodiments. 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.
[0047] At this stage, in order to realize fast sampling of the speed of the steam turbine and ensure the real-time performance of the measured speed, in order to control the speed of the steam turbine in real time, generally, firstly, the speed signal within a short period of time is taken from the speed signal measured by the speed sensor; and th...
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The invention discloses a method, device and equipment for filtering out interference signals. The method includes: acquiring a target signal, the target signal being a superposition signal of a rotational speed signal and an interference signal, and the interference signal includes a power frequency interference signal; The target signal within a first preset period is adopted, and the power frequency interference signal in the target signal is filtered out, and the ratio of the first preset period to the period of the power frequency interference signal is a positive integer. It can be seen that, by adopting the method of the target signal within the cycle time period of the power frequency interference signal that is an integer multiple, it is possible to eliminate the effect of the power frequency interference signal causing the superimposed signal to advance or lag behind the time when the real speed signal reaches a certain threshold. , that is, the low-frequency power frequency interference signal in the superimposed signal is filtered, so that the accurate speed of the steam turbine can be obtained, and the speed of the steam turbine can be controlled more accurately.
Description
technical field [0001] The invention relates to the technical field of industrial control, in particular to a method, device and equipment for filtering out interference signals. Background technique [0002] At present, most of the thermal power plants in our country are mainly in the form of steam turbines using waste heat to generate electricity. Since the rotational speed of the steam turbine has a great influence on the power it generates, it is particularly important to control the rotational speed of the steam turbine. Generally, the rotational speed of the steam turbine is measured first, and then the rotational speed of the steam turbine is controlled and adjusted according to the rotational speed. [0003] In the prior art, in order to realize the fast sampling of the rotational speed and ensure the real-time performance of the measured rotational speed, the rotational speed signal within a very short period of time is usually taken from the rotational speed signal...
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IPC IPC(8): F01D21/00G01P1/00
CPCF01D21/00F01D21/003F05D2270/02F05D2270/304G01P1/00
Inventor 徐文卿张腾飞洪忠亮吴新全
Owner ZHEJIANG SUPCON TECH