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Power quality adjustment method and power quality regulator

A power quality regulation, grid-side technology, applied in the direction of AC network voltage adjustment, circuit devices, AC network circuits, etc., can solve the problems of long detection lag time, large influence of system parameters, inability to meet real-time power quality control, etc. Reduce the impact of real-time compensation of the power grid and the effect of reducing time delay

Active Publication Date: 2019-02-05
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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  • Power quality adjustment method and power quality regulator
  • Power quality adjustment method and power quality regulator
  • Power quality adjustment method and power quality regulator

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Embodiment Construction

[0037] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0038] like figure 1 As shown, the unified power quality regulator mainly includes a series unit, a parallel unit and a DC energy storage unit, and the DC energy storage unit is connected to the series unit and the parallel unit for power supply. Wherein, the series unit includes a voltage detection module, a voltage compensation control module and a series converter; the parallel unit includes a current detection module, a current compensation control module and a parallel converter.

[0039] The above-mentioned series converter is equivalent to a controlled voltage source, which can compensate voltage quality problems such as sudden rise or drop of voltage on the power supply side, voltage imbalance, etc. by outputting the disturbance vo...

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Abstract

The invention relates to a power quality adjustment method and a power quality regulator. The power quality adjustment method comprises the steps of detecting a voltage signal on the power grid side,performing wavelet transform on the voltage signal on the power grid side, and acquiring a wavelet high frequency coefficient; comparing the wavelet high-frequency coefficient with a set threshold todetermine whether a voltage abrupt change occurs, and determining the start and end time of the power grid side voltage abrupt change; outputting an enable signal in the range of the start and end time of the sudden change of the voltage, and controlling a series unit to perform grid side voltage compensation. The power quality adjustment method and a power quality regulator performs wavelet transform on the voltage signal of the power grid, compares the wavelet high frequency coefficient with the set threshold value to determine the start and end time of the grid voltage sudden change. In turn, the series unit is controlled to perform accurate compensation of the voltage signal. Because the wavelet transform has the characteristics of accurate time domain localization of the sudden changeof a transient signal, the time delay is effectively reduced, and the effect of real-time compensation on the grid is reduced.

Description

technical field [0001] The invention relates to a method for regulating power quality and a power quality regulator, belonging to the technical field of power grid quality regulation. Background technique [0002] With the rapid development of power grid technology, the power quality of power grid has received more and more attention. On the one hand, power users have higher and higher requirements for power quality; on the other hand, the large number of distributed power sources and the use of nonlinear and impact loads have a serious impact on the power quality of the power grid, making the power quality of the power grid appear multiple simplifies and complicates. The unified power quality controller (UPQC), an important device based on modern power electronics technology, can not only compensate voltage quality problems such as voltage deviation and voltage sag, but also suppress current harmonics, and at the same time perform reactive power compensation to achieve pow...

Claims

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Application Information

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Patent Type & Authority Applications(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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