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Phase-locked loop and phase-locking method thereof

A phase-locked loop and phase-locked technology, applied in the field of phase-locked loops, can solve problems such as poor anti-interference ability and reduced phase-locking accuracy, and achieve the effect of enhancing anti-interference ability and avoiding frequency changes of the power grid

Inactive Publication Date: 2013-03-20
SHENZHEN JINGFUYUAN TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the technical problems of reduced phase-locking accuracy and poor anti-interference ability in the prior art, and provides a phase-locked loop and a method for performing phase-locking, which can quickly achieve phase-locking and have strong anti-interference ability

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  • Phase-locked loop and phase-locking method thereof
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  • Phase-locked loop and phase-locking method thereof

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Embodiment Construction

[0033] In order to make the technical problems, technical solutions and beneficial effects solved by 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.

[0034] like figure 1 as shown, figure 1 An embodiment of the present invention is shown. The technical solution in this implementation compares the preset voltage signal with the phase and frequency of the collected grid voltage signal to generate a phase deviation Δθ corresponding to the two signals, and uses the phase deviation to generate control signal to adjust the phase of the preset voltage signal, thereby reducing or eliminating the phase deviation, and finally enabling the preset voltage signal to track the frequency and phase of the power grid for closed-loop ...

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Abstract

The invention provides a phase-locking method of a phase-locked loop. The method comprises the following steps; obtaining a network voltage waveform signal and a preset voltage waveform signal; obtaining a first group of sine wave signal according to the network voltage waveform signal; obtaining a second group of sine wave signal according to the preset voltage waveform signal; each group of sine wave signal comprises two sine signals, and the phase deviation of two sine signals is a preset angle; obtaining the phase deviation of the network voltage waveform signal and the preset voltage waveform signal according to the first group of sine wave signal and the second group of sine wave signal; and adjusting the phase of output signals of the phase-locked loop according to the phase deviation. By adoption of the technical scheme for rapid phase locking, the influence from network frequency change is effectively avoided, and the disturbance resistance ability is effectively enhanced.

Description

technical field [0001] The invention belongs to the field of phase-locked loops, and in particular relates to a phase-locked loop and a method for performing phase-locking. Background technique [0002] In the photovoltaic grid-connected system, it is an essential link to accurately and quickly detect the frequency, phase and amplitude of the grid voltage. In the current photovoltaic grid-connected system, the phase-locked loop is used to track and monitor the frequency, phase and amplitude of the grid voltage. [0003] In the prior art, the phase-locked loop realizes phase-locking by detecting the zero-crossing point of the grid voltage, but this method has poor anti-interference ability. Compared with the traditional digital phase-locked loop, the single-phase phase-locked loop based on the second-order universal integrator has the advantages of not being affected by the frequency change of the power grid and having strong anti-interference ability, but the algorithm will...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/085H03L7/099
Inventor 刘晓红陈恒留
Owner SHENZHEN JINGFUYUAN TECH
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