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DSOGI phase-locked loop based on differential harmonic elimination

A phase-locked loop and differential technology, which is applied to harmonic reduction devices and AC networks to reduce harmonics/ripples, etc., can solve problems such as directional voltage fluctuations, improve accuracy, optimize compensation effects, and improve harmonic extraction accuracy Effect

Inactive Publication Date: 2019-03-26
CHINA DATANG CORP SCI & TECH RES INST CO LTD EAST CHINA BRANCH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the harmonic content of the power grid is large, the fundamental frequency signal extracted by DSOGI will cause the pulsation of the directional voltage

Method used

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  • DSOGI phase-locked loop based on differential harmonic elimination
  • DSOGI phase-locked loop based on differential harmonic elimination
  • DSOGI phase-locked loop based on differential harmonic elimination

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Embodiment Construction

[0029] refer to Figure 5 , the present invention proposes a DSOGI phase-locked loop based on differential harmonic elimination, including: DSOGI, differential harmonic elimination unit, Parker transform based on two-phase synchronous rotating coordinate system, proportional integrator, integral link and sine-cosine calculation unit.

[0030] The input terminal of DSOGI is connected to the three-phase grid voltage U abc , the output end of DSOGI is connected with the input end of the differential harmonic elimination unit, and the output end of the differential harmonic elimination unit is connected with the input end of the Park transform. The differential harmonic elimination unit is used for the output of DSOGI and Differentiate to eliminate harmonics.

[0031] The output of the Park transform is connected to the input of the proportional-integral controller, and the output signal of the proportional-integral controller is related to the natural frequency ω f After th...

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Abstract

The invention provides a DSOGI phase-locked loop based on differential harmonic elimination. The DSOGI phase-locked loop comprises a DSOGI, a differential harmonic elimination unit, a Parker transformation unit based on two-phase synchronous rotating coordinate system, a proportional integrator, an integral link and a sine and cosine calculation unit. An input end of the DSOGI is connected to three-phase grid voltage Uabc, an output end of the DSOGI is connected to an input end of the differential harmonic elimination unit, an output end of the differential harmonic elimination unit is connected to an input end of the Parker transformation unit, and the differential harmonic elimination unit is used for performing a differential operation on U(alpha)<+> and U(beta)<+> outputted by the DSOGI to eliminate harmonics. According to the DSOGI phase-locked loop based on differential harmonic elimination proposed by the invention, a traditional DSOGI phase-locked loop is improved, the differential harmonic elimination unit is introduced, the output end of the DSOGI is connected to the differential harmonic elimination unit to form a new controller, and so that the harmonic extraction accuracy of the DSOGI phase-locked loop based on differential harmonic elimination is improved.

Description

technical field [0001] The invention relates to the technical field of grid voltage phase detection and harmonic suppression, in particular to a DSOGI phase-locked loop based on differential harmonic elimination. Background technique [0002] In the fields of photovoltaic grid-connection, distributed power generation, flexible AC transmission, active filter, high-voltage direct current transmission, etc., due to the widespread use of grid-connected converters, it is required that the grid-connected converters need to be reasonably controlled. Among them, grid synchronization is a basic problem, and accurate real-time estimation of the amplitude, frequency and phase angle of the grid voltage signal is its main task. Non-ideal phenomena such as unbalance and voltage harmonic distortion often appear in the actual operation of the power grid, and these phenomena put forward higher performance requirements for the phase-locked loop. [0003] Based on synchronous reference frame ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/40
Inventor 汪兴张俊雄田龙刚盛明珺陈延云戴申华赵淼王萍
Owner CHINA DATANG CORP SCI & TECH RES INST CO LTD EAST CHINA BRANCH