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A Fast and Accurate Perception Method of Power Grid Information Based on Nonlinear Robust Estimation

A robust estimation and non-linear technology, applied in the direction of measuring electricity, electrical components, circuit devices, etc., can solve the problems of inability to calculate in real time, slow tracking speed, and low estimation accuracy, so as to eliminate the transition process of transient tracking and ensure integrity The effect of precision and speed

Active Publication Date: 2022-02-08
SHANDONG UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the shortcomings of existing methods such as poor robustness, inability to calculate in real time, low estimation accuracy and slow tracking speed, the present invention proposes a fast and accurate perception method for power grid information based on nonlinear robust estimation

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  • A Fast and Accurate Perception Method of Power Grid Information Based on Nonlinear Robust Estimation
  • A Fast and Accurate Perception Method of Power Grid Information Based on Nonlinear Robust Estimation
  • A Fast and Accurate Perception Method of Power Grid Information Based on Nonlinear Robust Estimation

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Embodiment 1

[0023] This embodiment provides a fast and accurate sensing method for power grid information based on nonlinear robust estimation;

[0024] Such as figure 1 As shown, a fast and accurate perception method of power grid information based on nonlinear robust estimation, including:

[0025] S101: Obtain an actual grid phase voltage signal;

[0026] S102: Obtain a distorted grid model in a nonlinear state space based on the actual grid phase voltage signal and its virtual quadrature signal;

[0027] S103: According to the distorted power grid model in the nonlinear state space, establish smoothed estimated performance metrics; according to The smoothed estimated performance metrics will be The smoothing estimation problem is transformed into a generalized smoothing estimation problem; construct smoothing estimator;

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Abstract

The invention relates to the technical field of amplitude / frequency / phase information sensing of grid voltage, and discloses a fast and accurate sensing method for grid information based on nonlinear robust estimation, including: obtaining the actual grid phase voltage signal; based on the actual grid phase voltage signal and its virtual orthogonal signal to obtain the distorted power grid model of the nonlinear state space; according to the distorted power grid model of the nonlinear state space, a smooth estimation performance index is established; according to the smooth estimation performance index, the smooth estimation problem is transformed into a generalized smooth estimation Problem: Construct a smooth estimator; use the smooth estimator to obtain the initial sensed value of the amplitude and phase of the grid voltage signal; detect the zero-crossing point of the initial sensed value and phase of the grid voltage signal, and get Amplitude, frequency and phase sense values ​​of the distortion voltage. It is used to quickly and accurately sense the fundamental frequency, amplitude and phase of the grid voltage.

Description

technical field [0001] The invention relates to the technical field of amplitude / frequency / phase information perception of grid voltage, in particular to a fast and accurate sensing method for grid information based on nonlinear robust estimation. Background technique [0002] The statements in this section merely mention the background technology related to the present invention and do not necessarily constitute the prior art. [0003] The development of new energy is a key way to solve the energy crisis and environmental pollution. However, after new energy is connected to the grid on a large scale, the problem of reliable grid connection of its power generation has become increasingly prominent, which has seriously restricted the healthy development of the industry. In particular, new energy stations are often located at the end of the grid structure. The equivalent impedance between the grid connection point and the remote backbone grid is large, which can easily cause p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00G01R31/00
CPCH02J3/00G01R31/00H02J2203/20G01R19/2513G01R19/175
Inventor 张承慧
Owner SHANDONG UNIV