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A kind of power quality regulation method and power quality regulator

A power quality regulation and grid-side technology, applied in AC network voltage adjustment, circuit devices, AC network circuits, etc., can solve problems such as large influence of system parameters, inability to meet real-time power quality control, long detection lag time, etc.

Active Publication Date: 2021-05-11
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +4
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Problems solved by technology

[0004] The purpose of the present invention is to provide a power quality adjustment method and a power quality regulator, which are used to solve the technical problems that the unified power quality regulator has a long detection lag time, is greatly affected by system parameters, and cannot satisfy real-time power quality control

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  • A kind of power quality regulation method and power quality regulator
  • A kind of power quality regulation method and power quality regulator
  • A kind of power quality regulation method and power quality regulator

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Embodiment Construction

[0037]In order to make the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific examples.

[0038]Such asfigure 1 As shown, the unified power quality regulator mainly includes a series unit, a parallel unit, and a DC energy storage unit, and a DC storage unit power supply connection series unit and a parallel unit. Among them, the series unit includes a voltage detecting module, a voltage compensation control module, and a series variable converter; the parallel unit includes a current detecting module, a current compensation control module, and a parallel transformer.

[0039]The above series variable fluctu is equivalent to the controlled voltage source, by outputting the inverted disturbance voltage to compensate for the voltage quality problem of the power supply side voltage or temporary, the voltage unbalanced, and finally realizes the standard si...

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Abstract

The invention relates to a power quality adjustment method and a power quality regulator. The power quality adjustment method includes: detecting the voltage signal on the grid side, performing wavelet transformation on the voltage signal on the grid side to obtain a wavelet high-frequency coefficient; combining the wavelet high-frequency coefficient with the set Compare with a fixed threshold to judge whether a voltage mutation occurs, and then determine the start and end time of the voltage mutation on the grid side; within the range of the start and end time of the voltage mutation, output an enable signal to control the series unit to perform grid side voltage compensation. The present invention performs wavelet transformation on the grid voltage signal, compares the wavelet high-frequency coefficient with the set threshold to determine the start and end moments of the grid voltage mutation, and then controls the series units to complete the precise compensation of the voltage signal. The characteristics of precise time-domain positioning of signal mutation points can effectively reduce time delay and reduce the effect of real-time compensation on the power grid.

Description

Technical field[0001]The present invention relates to a power quality adjustment method and a power quality regulator belonging to the field of grid quality adjustment technology.Background technique[0002]With the rapid development of grid technology, the quality of grid electric energy is increasingly widely concerned. On the one hand, power users have a higher demand for power quality; on the other hand, a large amount of access and nonlinear, impact load use of the distributed power supply have a serious impact on the quality of grid electric energy, so that the quality of the grid electric energy is multiple Chemical and complicated. An important device unified power quality controller (UPQC) based on modern power electronic technology, can be compensated for both pressure deviation, voltage temporary degradation, etc., but also suppress current harmonics, and can also perform reactive compensation, power quality Comprehensive management is an effective way to solve the problem ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H02J3/16
CPCH02J3/01H02J3/16H02J2203/20Y02E40/30Y02E40/40
Inventor 黄晓明黄弘扬黄利军许丹李献伟毋炳鑫谢卫华王毅王雷涛楼平
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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