Non-linear amplitude phase detection method suitable for single-phase distortion power grid

A detection method and non-linear technology, applied in the direction of only measuring voltage, measuring device, measuring electrical variables, etc., can solve the problems of grid synchronization calculation method without relevant technical implementation, slow frequency change of grid signal, etc.

Active Publication Date: 2016-03-23
SHANDONG UNIV
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Problems solved by technology

[0005] However, at present, there is no relevant technical implementation for the power grid signal with slow frequency change, and the synchronization calculation method for the power grid

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  • Non-linear amplitude phase detection method suitable for single-phase distortion power grid
  • Non-linear amplitude phase detection method suitable for single-phase distortion power grid
  • Non-linear amplitude phase detection method suitable for single-phase distortion power grid

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Embodiment Construction

[0069] The present invention is described in detail below in conjunction with accompanying drawing:

[0070] Such as Figure 1b As shown, this patent relates to a software amplitude-phase tracking method based on a nonlinear adaptive filter, including a frequency-locked loop (FLL), an adaptive quadrature generator (AQSG k ), multi-loop feedback decoupling network and amplitude-phase calculation link.

[0071] The basic principle is to use the nonlinear frequency-locked loop designed by the Lyapunov method to adaptively filter the single-phase distorted power grid signal, and accurately extract the fundamental wave and low-order harmonic signals through multi-loop feedback decoupling, thereby realizing the fundamental wave component phase synchronization, amplitude tracking and harmonic extraction.

[0072] This method is suitable for power grid signals with slow frequency changes. It is a high-efficiency power grid synchronization technology that can quickly track frequency ...

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Abstract

The invention discloses a non-linear amplitude phase detection method suitable for a single-phase distortion power grid, and the method comprises the steps: extracting a fundamental wave signal of a single-phase signal through employing a stationary coordinate system phase locking ring method according to a mode of the single-phase distortion power grid, and building an orthogonal signal; building a liapunov function according to the fundamental wave signal of the single-phase signal and the orthogonal signal, and obtaining an adaptive orthogonal generator and a frequency locking ring because the differential coefficient of the liapunov function is less than zero, i.e., system global stability and convergence; and the fundamental wave amplitude and phase of the single-phase signal are obtained according to the adaptive orthogonal generator and the frequency locking ring. The method is designed according to the mode of the single-phase distortion power grid, achieves the estimation of a diagonal frequency signal through employing a liapunov method, does not depend on a conventional linearization method, and guarantees the signal integrity through employing a non-linear method.

Description

technical field [0001] The invention relates to a nonlinear amplitude and phase detection method suitable for a single-phase distorted power grid. Background technique [0002] In grid-related power conversion, such as grid-connected inverters, active filters, V2G systems, and distributed energy storage systems, which are booming, grid synchronization technology has been widely used as a key technology. The rapid and accurate detection of sudden phase changes, frequency disturbances and amplitude fluctuations in single-phase power frequency power grids has put forward strict requirements for single-phase phase-locked control technology. In the energy exchange with the power grid, the detection of the fundamental wave of the power grid provides an accurate AC reference signal for the power converter to meet the power quality standards and achieve reliable operation; in addition, the extraction of harmonics in the power grid is in the micro-grid system be widely used. [000...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R25/00G01R23/02
CPCG01R19/0084G01R23/02G01R25/00
Inventor 张承慧杜春水王生飞
Owner SHANDONG UNIV
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