Method of modifying dynamic performance of phase-locked loop on basis of sliding filter

A dynamic performance, phase-locked loop technology, applied in the direction of automatic power control, electrical components, etc., can solve the problem of system bandwidth reduction, affecting the dynamic performance of the phase-locked loop, etc.

Active Publication Date: 2015-07-29
SHANDONG UNIV
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Problems solved by technology

However, due to the limitation of the MAF window width, the system bandwidth of the phase-locked loop after the introduction of MAF is greatly reduced, which seriously affects the dynamic performance of the phase-locked loop.

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  • Method of modifying dynamic performance of phase-locked loop on basis of sliding filter
  • Method of modifying dynamic performance of phase-locked loop on basis of sliding filter
  • Method of modifying dynamic performance of phase-locked loop on basis of sliding filter

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Embodiment Construction

[0060] The present invention is described in detail below in conjunction with accompanying drawing:

[0061] I. Introduction of traditional MAF-PLL

[0062] figure 1 is the structure diagram of the three-phase MAF-PLL. MAF is a linear phase finite impulse response filter whose input is x(t) and output is y(t), then its input and output can be expressed as,

[0063] y ( t ) = 1 T w ∫ t - T w t s ( τ ) dτ - - - ( 1 )

[0064] where T w is the integral window width, the expression of MAF in S domain can be obtained through (1),

[0065] MAF (...

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Abstract

The invention discloses a method of modifying dynamic performance of a phase-locked loop on basis of a sliding filter. The method includes: sampling three-phase grid voltage, and performing Park coordinate transform to obtain voltage components v<q> and v<d> in a two-phase dq rotating coordinate system; subjecting the voltage component v<d> to differentiation and then to dividing by an angular frequency parameter, and summing a quotient and the voltage component v<q> to obtain q ; subjecting q to differentiation and then to dividing by the angular frequency parameter, and summing a quotient and the voltage component v<d> to obtain d; subjecting d to the sliding filter to obtain a fundamental wave positive-sequence voltage amplitude V<1><+>; subjecting q to the sliding filter and a PI (proportion integration) regulator, and summing an output of the PI regulator and a preset angular frequency to obtain a grid voltage angular frequency , with the preset angular frequency being power frequency usually; subjecting to differentiation to obtain a grid voltage phase 1+; feeding back 1+ to the input end to finish closed-loop control. The method has the advantages that a proportional algorithm of input signal frequency changes is introduced to MAF-PLL (moving average filter-phase-locked loop), the lowest frequency fluctuation component in the PLL is eliminated, the window width of the MAF is decreased, and dynamic performance of the MAF-DLL is improved.

Description

technical field [0001] The invention relates to a method for improving dynamic performance of a phase-locked loop based on a sliding filter. Background technique [0002] With the development of power electronics and new energy technologies, technologies such as distributed generation grid connection, flexible AC transmission, active power filter, and flexible DC transmission have developed rapidly. In these technologies, the converter is often connected to the public node (Point of Common Coupling, PCC) of the power grid. For this reason, the grid fundamental positive sequence voltage information (such as phase and frequency) at the PCC must be acquired quickly and accurately in real time. [0003] Phase Locked Loop (Phase Locked Loop, PLL) is the main method to obtain the above information. A large number of literatures have proposed different PLL design methods, and the most widely used one is Single Synchronous Frame Phase Locked Loop (SRF-PLL). SRF-PLL can be applied ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/08
Inventor 梁军王金玉贠志皓
Owner SHANDONG UNIV
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