Single-phase adaptive phase-locking device and method

Abstract

The embodiment of the application discloses a single-phase adaptive phase-locking device and method. The single-phase adaptive phase-locking device includes: a phase detector, a proportional-integralcontroller, a dynamic notch filter and a voltage-controlled oscillator, wherein the phase detector is used to obtain the phase error signal according to the single-phase grid voltage signal and the first output voltage signal of the voltage controlled oscillator; the proportional integral controller is used to perform proportional integral adjustment on the phase error signal, to filter out the noise components and high frequency components in the phase error signal, and to generate a first phase deviation signal; the dynamic notch filter is used to notch the first phase deviation signal, to filter out the high-frequency component of the first phase deviation, and to obtain a second phase deviation signal; and the voltage-controlled oscillator is used to adjust the first output voltage signal to be the second output voltage signal according to the second phase deviation signal. The embodiments of the present application can effectively eliminate high-frequency components in the outputsignal of the single-phase phase-locked loop, and at the same time take into account the dynamic response and steady-state performance of the single-phase phase-locked loop.

Description

technical field [0001] The present application relates to the field of electronic technology, and in particular to a single-phase adaptive phase-locking device and method. Background technique [0002] One of the effective ways to solve the grid harmonic pollution and improve the power factor in the single-phase power grid is to use single-phase active power factor correction technology. The single-phase active power factor correction circuit using average current control usually requires accurate To obtain the phase of the power grid, in the prior art, a single-phase phase-locked loop is usually used to obtain the phase of the above-mentioned power grid. [0003] However, applying the traditional single-phase phase-locked loop to single-phase active power factor correction cannot accurately obtain the phase of the single-phase grid. This is because the phase difference signal generated by the traditional phase-locked loop through the phase detector not only contains the di...

AI Technical Summary

Problems solved by technology

To better filter high-frequency components, the bandwidth of the proportional-integral controller should be set low enough. However, if the bandwidth of the proportional-integral controller is too low, the dynamic response of the entire phase-locked loop will be slow

However, if the bandwidth is set higher in order to improve the dynamic response, the steady-state output of the phase-locked loop is superimposed with a harmonic corresponding to the high-frequency component because the high-frequency components are not well attenuated, which is manifested as the phase-locked loop The output frequency will have a sinusoidal oscillation near the fundamental frequency, which will reduce the steady-state performance

To sum up, the traditional single-phase phase-locked loop cannot take into account the dynamic response and steady-state performance of the single-phase phase-locked loop at the same time.

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