A single-phase phase-locking method and device

Abstract

The invention discloses a single-phase phase-locking device. In the device, a Kalman filter combines a zero-crossing detection phase-locker and a DQ coordinate system phase-locker, and performs phase-locking on the zero-crossing detection phase-locker and the DQ coordinate system. Kalman filtering is performed on the frequency, phase, and amplitude sent by the device to obtain the final phase, final amplitude, and final frequency. The invention also discloses a single-phase phase-locking device, which can greatly eliminate sampling errors and recursively calculate the response by using Kalman filtering The advantage of fast speed realizes the fast and accurate phase-locking function of the input signal sent by the single-phase electrical system, which far exceeds the dynamic performance and static performance of the traditional phase-locked loop, and overcomes the slow speed and vulnerability of the traditional single-phase phase-locking method. The shortcoming of interference has realized the fast and accurate phase-locking function of the phase, amplitude and frequency of the input signal in the 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...

AI Technical Summary

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

Images