Power grid peak value sampling method based on derivative algorithm

Abstract

The invention discloses a power grid peak value sampling method based on a derivative algorithm. The method comprises the following steps of: electrifying and initializing a parameter variable, starting timing via an internal clock, sampling voltage values at fixed time intervals, recording sampling values and sampling time, and conducting fitting to obtain a third-order function; taking a secondderivative of the third-order function to obtain a maximum value, sampling two groups of data on the left side and the right side of the maximum value, and conducting respective fitting to obtain twogroups of first-order functions respectively; and taking first-order derivatives of the two groups of first-order functions respectively, finding out a first maximum value and a second maximum value from the two groups of data, and taking an average value as a power grid peak value. According to the power grid peak value sampling method based on the derivative algorithm, the voltage value is sampled once at fixed time intervals, a third-order polynomial function is fitted through a curve after continuous acquisition, and then the peak value turning point of the power grid alternating voltage is judged by judging the concavity and convexity of the function by taking the second derivatives, so the power grid peak value sampling method has the characteristics of short response time, high accuracy, and automatic self-adaptivity to different alternating-current power grids.

Description

technical field [0001] The invention belongs to the technical field of grid power supply, and in particular relates to a grid peak sampling method based on a derivative algorithm. Background technique [0002] In the case of unknown power supply parameters of the grid, in order to configure the initial parameters of the control system, the general control system will collect the parameters (voltage or frequency) of the grid. [0003] The operating frequency of the power grid is relatively easy to measure, but the voltage is alternating, which has certain impact hazards on the system and loads. Therefore, to detect the voltage of the AC power grid, the actual voltage is usually obtained by frequent sampling and averaging. value, but this method is more traditional, less accurate, and consumes more system resources. Contents of the invention [0004] In order to solve the above problems, the present invention provides a grid peak sampling method based on a derivative algori...

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Problems solved by technology

[0003] The operating frequency of the power grid is relatively easy to measure, but the voltage is alternating, which has certain impact hazards on the system and loads. Therefore, to detect the voltage of the AC power grid, the actual voltage is usually obtained by frequent sampling and averaging. value, but this method is more traditional, less accurate, and consumes more system resources

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