Phase-locked loop modeling method and system based on time-delay phase-shift orthogonal signal generator

Abstract

The invention provides a phase-locked loop modeling method and system based on a time-delay phase-shift orthogonal signal generator. The method comprises the steps that: with the effect of T / 4 delay on an original input signal considered, the transfer function of T / 4 delay is included into voltage impact on an alpha coordinate axis and a beta coordinate axis, and the input signal of a phase-lockedloop is reconstructed; harmonic linearization is carried out on a control link of the small signal of a T / 4 delay phase-locked loop in a frequency domain; and an output cosine signal response causedby power grid voltage disturbance in the running state of the T / 4 delay phase-locked loop is obtained by utilizing a linearization result; and the accurate transfer function model of the T / 4 delay phase-locked loop can be calculated. The accurate modeling method for the time-delay phase-shift orthogonal signal generator is beneficial to the accurate modeling of the impedance of an inverter, and finally beneficial to improving the accuracy of system stability analysis.

Description

technical field [0001] The invention relates to the field of AC power transmission and distribution, in particular to a single-phase phase-locked loop modeling method and system based on a time-delay phase-shift quadrature signal generator. Background technique [0002] With the increasing depletion of traditional fossil energy such as coal and oil, as well as numerous environmental problems, new energy generation technology based on renewable energy (such as wind energy, solar energy, tidal energy, etc.) is an important way for humans to deal with environmental pollution and energy crises. One of the methods has received more and more attention in recent years. For example, my country has built many 10-million-kilowatt-level wind power / photovoltaic bases in the "Three Norths", and the use of UHV DC transmission is a new form of new energy development and utilization in my country. The DC grid-connected system of the renewable energy power generation base includes grid-conn...

AI Technical Summary

Problems solved by technology

[0006] In summary, although the existing T / 4 delay PLL model can reflect some characteristics of the phase-locked loop, its derivation process ignores the non-ideality of the actual quadrature signal, so the accuracy of the model is far from the actual working conditions.

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