A method and device for anti-harmonic frequency measurement based on sinusoidal filtering

A technology of sinusoidal filtering and frequency measurement, which is applied in the field of power system detection, can solve problems such as inaccurate frequency measurement results, and achieve accurate frequency measurement results

CN109030938BActive Publication Date: 2021-05-11XUJI GRP +4
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-05-11

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Abstract

The invention provides an anti-harmonic frequency measurement method and device based on sinusoidal filtering, wherein the method includes the following steps: low-pass filtering the frequency signal of the power system to obtain a low-frequency signal of the power system; performing sinusoidal filtering on the low-frequency signal of the power system Filter to obtain the frequency measurement signal of the power system; perform frequency measurement processing on the frequency measurement signal of the power system to obtain the real-time frequency of the power system. The technical solution provided by the invention first eliminates the high-frequency signal and then eliminates the interference of the low-frequency harmonic when performing frequency measurement processing on the power system, so the frequency measurement result is more accurate.
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Description

technical field

[0001] The invention belongs to the technical field of power system detection, and in particular relates to an anti-harmonic frequency measurement method and device based on sinusoidal filtering. Background technique

[0002] In the power system, frequency is one of the important indicators of power quality and an important parameter reflecting the operating state of the power system. In general, the frequency of the power system reflects the basic state of the balance between supply and demand of active power in the power system, and it will slowly change in a small range with load fluctuations. When the power system is in a stable operating state, the output power of the generator maintains a balance with the load and power loss of the power system, and the frequency of the power system is the nominal value. If there are large-capacity loads or high-power generator switching in the power system, or the control equipment is not perfect, it will cause the fr...

Examples

Embodiment Construction

[0028] The purpose of the present invention is to provide an anti-harmonic frequency measurement method and device based on sinusoidal filtering, which is used to solve the problem of inaccurate frequency measurement results when harmonics exist in the power system.

[0029] To achieve the above object, the technical solution provided by the invention is:

[0030] A kind of anti-harmonic frequency measurement method based on sinusoidal filter, comprises the steps:

[0031] (1) Perform low-pass filtering on the frequency signal of the power system to obtain the low-frequency signal of the power system;

[0032] (2) Perform sinusoidal filtering on the low-frequency signal of the power system to obtain the frequency measurement signal of the power system;

[0033] (3) Perform frequency measurement processing on the frequency measurement signal of the power system to obtain the real-time frequency of the power system.

[0034] Embodiments of the present invention will be further...