Single-phase phase-locked loop based on multi-frequency multiplication principle and amplitude-frequency two-dimensional tracking control method

Abstract

The invention discloses a single-phase phase-locked loop based on a multi-frequency multiplication principle and an amplitude-frequency two-dimensional tracking control method, and belongs to the field of power systems, and the single-phase phase-locked loop comprises a multi-frequency multiplication processing module which is used for carrying out multi-frequency multiplication processing on an original signal and then outputting phase information as a control signal X (t); the error calculation module is used for calculating an amplitude error and a phase error of the control phasor relative to the tracking signal to obtain an amplitude error control signal delta Ay (t) and a phase error control signal delta theta y (t); projection of the phasor on the alpha axis and projection of the phasor on the beta axis are controlled to be AM (t) sin theta M (t) and AM (t) X (t) respectively, and the amplitude and the phase of the tracking signal are the measurement amplitude AM (t) and the measurement phase theta M (t) respectively. And the tracking control module is used for filtering high-frequency components in the delta Ay (t) and the delta theta y (t) to obtain an amplitude and a phase error of the multi-frequency original signal relative to a tracking signal, taking the error as zero as a control target for control, and combining the amplitude and the phase initial value to obtain a new measurement amplitude and a new measurement phase so as to realize immediate tracking of the amplitude and the phase. According to the invention, an accurate and rapid phase locking function can be realized.

Description

technical field [0001] The invention belongs to the field of electric power systems, and more specifically relates to a single-phase phase-locked loop and an amplitude-frequency two-dimensional tracking control method based on the principle of multiplication. Background technique [0002] The synchronization of each device in the system is the basis for the stable and reliable operation of the system, and it is also an important factor affecting the performance of the system. Therefore, for almost all grid-connected equipment, especially power electronic equipment, it is necessary to continuously monitor the grid voltage information, including frequency, phase and amplitude, to ensure that the output voltage is the same frequency and phase as the grid, and realize the synchronous operation of the grid. [0003] With the large-scale application of power electronic equipment such as PWM rectifiers, static var generators (SVG), and uninterruptible power supplies (UPS), phase-lo...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the defects and improvement needs of the prior art, the present invention provides a single-phase phase-locked loop and amplitude-frequency two-dimensional tracking control met

Images