Method for Improving Dynamic Performance of PLL Based on Sliding Filter

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

Active Publication Date: 2017-08-15
SHANDONG UNIV
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  • Abstract
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  • Application Information

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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.

Method used

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  • Method for Improving Dynamic Performance of PLL Based on Sliding Filter
  • Method for Improving Dynamic Performance of PLL Based on Sliding Filter
  • Method for Improving Dynamic Performance of PLL Based on Sliding Filter

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Embodiment Construction

[0061] The present invention is described in detail below in conjunction with accompanying drawing:

[0062] I. Introduction of traditional MAF-PLL

[0063] 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,

[0064]

[0065] where T w is the integral window width, the expression of MAF in S domain can be obtained through (1),

[0066]

[0067] It can be seen from (2) that MAF needs a time equal to the window width to reach a steady-state output, so the longer the window, the slower the dynamic response of MAF. From the following analysis, it can be seen that the longer the window, the cut-off of MAF-PLL The lower the frequency, the slower the dynamic response of the entire system.

[0068] Bring s=jω into (2), the amplitude and phase expression of MAF can be obtained

[0069]

[0070] It can be seen from (3) that...

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Abstract

The invention discloses a method for improving the dynamic performance of a phase-locked loop based on a sliding filter. After differentiation, divide by the angular frequency parameter, and then add it to vq to obtain the obtained vq, divide it by the angular frequency parameter, and then add it to vd to obtain the fundamental positive sequence voltage amplitude obtained after passing through the sliding filter The value will be obtained through the sliding filter and then through the PI regulator, the output of the PI regulator is added to the preset angular frequency to obtain the grid voltage angular frequency measured by the phase-locked loop. The preset angular frequency is usually the power frequency; the obtained Integrate to obtain the grid voltage phase measured by the phase-locked loop and feed back the obtained input terminal to complete the closed-loop control. This application introduces a proportional algorithm that varies with the frequency of the input signal into the MAF-PLL to eliminate the lowest frequency fluctuation component in the PLL, thereby reducing the window width of the MAF and improving the dynamic performance of the MAF-PLL.

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 Patents(China)
IPC IPC(8): H03L7/08
Inventor 梁军王金玉贠志皓
Owner SHANDONG UNIV
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