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Variable step harmonic current detection method based on arc tangent function

A technology of arc tangent function and harmonic current, which is applied in the direction of measuring current/voltage, measuring device, measuring electrical variables, etc., can solve the problems of not eliminating the influence of the harmonic step size of the same frequency, complicated calculation steps, and difficult to use, etc. Achieve the effect of suppressing aperiodic distortion current interference, improving detection effect, and high precision

Pending Publication Date: 2022-05-06
宁波力斗智能技术有限公司
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Problems solved by technology

Some do not eliminate the influence of the same frequency harmonics on the step size, some calculation steps are cumbersome, and some are difficult to apply to practical applications

Method used

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  • Variable step harmonic current detection method based on arc tangent function
  • Variable step harmonic current detection method based on arc tangent function
  • Variable step harmonic current detection method based on arc tangent function

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Embodiment Construction

[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0031] Such as figure 1 Shown is a flow chart of a method for detecting harmonic currents with a variable step size based on an arctangent function provided by an embodiment of the present invention, including the following steps:

[0032] S1: Sampling

[0033] For periodic non-sinusoidal load current i L (t) Sampling to obtain the discrete value i of the load current at the current k moment ...

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Abstract

The invention discloses a variable-step harmonic current detection method based on an arc tangent function, and belongs to the technical field of harmonic current detection of a power system, and the method comprises the steps: S1, sampling a periodic non-sinusoidal load current iL (t) to obtain a load current discrete value iL (k) at the current k moment; s2, calculating the output of the adaptive filter; S3, calculating an error signal; s4, step length updating: calculating the index value of the step length, and calculating the step length lambda (k + 1) of the adaptive filter at the next moment through an exponential function; s5, updating a weight coefficient; and S6, k is made to be equal to k + 1, the steps S1 to S5 are repeated, and the estimated value of the generalized harmonic current of the periodic non-sinusoidal load current iL (t) can be output in real time. The method is high in harmonic current detection capacity, high in convergence speed, low in steady-state error and obvious in detection effect.

Description

technical field [0001] The invention belongs to the technical field of harmonic current detection in electric power systems, and more specifically relates to a variable-step harmonic current detection method based on an arctangent function. Background technique [0002] In recent years, the application of a large number of power electronic devices in the power system has made the problem of harmonic pollution in the power grid increasingly prominent, seriously affecting the quality of the power grid and the safe operation of user equipment. Therefore, it is very important to effectively control harmonics to improve power quality. Among them, one of the most typical control schemes is an active power filter (Active power filter, APF). The APF is based on real-time detection of grid harmonics, and correspondingly injects an anti-phase harmonic current into the grid, thereby realizing compensation and suppression of harmonic pollution to the grid. The quality of its performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/16G01R19/00
CPCG01R23/16G01R19/00
Inventor 何怡刚刘倩倩
Owner 宁波力斗智能技术有限公司
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