Single phase locking method and device

Abstract

The invention discloses a single phase locking device. In the device, a Kalman filter is used for combing a zero crossing point detection phase locker and a DQ coordinate system phase locker and performing Kalman filtration on frequency values, phase positions and amplitude values sent by the zero crossing point detection phase locker and the DQ coordinate system phase locker so as to obtain a final phase position, a final amplitude and a final frequency. The invention also discloses a single phase locking device which can realize a rapid and accurate phase locking function on an input signal sent by a single-phase electrical system by utilizing the advantages that sampling errors can be greatly eliminated due to the Kalman filtration and the recursive computation is high in response speed, so that the device is far better than a traditional phase locking ring in dynamic performance and static performance, overcomes the shortcomings that a traditional single phase locking method is low in speed and easy to affect, and realizes a rapid and accurate phase locking function on the phase position, amplitude and frequency of an input signal of a single-phase power grid.

Description

technical field [0001] The present invention relates to the technical field of phase locking, in particular to a single-phase phase locking method and device. Background technique [0002] The phase-locking link in the single-phase power system is the basis of single-phase inverter and power quality detection, so the performance of the phase-locker is directly related to the performance of the above-mentioned equipment. The principle of phase locking is to identify the three key parameters of the current sine wave amplitude, phase, and frequency of the AC grid voltage or current through certain control technology means or devices. [0003] In order to achieve phase locking, the general practice in the prior art is to implement phase locking in the DQ coordinate system after zero-crossing detection or through a second-order generalized integrator to generate a set of orthogonal signals. There are some problems in the application of the above two phase-locking methods in sing...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a single-phase phase-locking method, which overcomes the shortcomings of the traditional single-phase phase-locking method, which are slow and susceptible to interference, and realizes the fast and accurate phase, amplitude and frequency of the input signal in the single-phase power grid. Phase-locking function; Another object of the present invention is to provide a single-phase phase-locking device

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