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Single-phase UPQC voltage harmonic control method

A technology of voltage harmonics and control methods, applied in AC network voltage adjustment, AC network to reduce harmonics/ripple, reactive power adjustment/elimination/compensation and other directions, can solve the load voltage distortion, can not meet the series side compensation Voltage output requirements and other issues, to achieve the effect of increasing sine, simple and clear control method, and improving system performance

Pending Publication Date: 2022-05-31
GUANGXI COLLEGE OF WATER RESOURCES & ELECTRIC POWER
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Problems solved by technology

[0004] The invention aims at the problem of load voltage distortion caused by reactive power and harmonic current flowing through the series-side converter of the left-parallel-right series UPQC, while the traditional double closed-loop control of voltage and current cannot meet the compensation voltage of the series side under nonlinear load conditions output requirements, a single-phase UPQC voltage harmonic control method based on characteristic sub-harmonic compensation is proposed

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Embodiment Construction

[0067] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0068] It should be understood that when used in this specification and the appended claims, the terms "comprising" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude one or Presence or addition of multiple other features, integers, steps, operations, elements, components and / or collections thereof.

[0069] It should also be understood that the terminology used ...

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Abstract

The invention belongs to the technical field of electric energy quality control, and particularly relates to a single-phase UPQC voltage harmonic control method. According to the invention, the harmonic component in the compensation voltage can be compensated, the control algorithm is simple and clear, the realization difficulty is low, the compensation effect on each harmonic is obvious, and the harmonic content of the compensation voltage and the load voltage is effectively reduced. According to the invention, reactive power and each harmonic wave in the compensation voltage can be compensated in a targeted manner; the control method is simple and clear, low in implementation difficulty and good in dynamic performance; the compensation effect is good, the sinusoidal property of the compensation voltage can be remarkably improved, and the UPQC system performance is improved; the method can enhance the stability and reliability of UPQC system compensation, and is suitable for various left-to-right serial UPQC topological structures.

Description

technical field [0001] The invention belongs to the technical field of power quality control, and in particular relates to a single-phase UPQC voltage harmonic control method. Background technique [0002] With the rapid development of power electronic equipment, the power load presents a trend of diversification. In power distribution systems, both power sources and sensitive loads have strict requirements on power quality. Unified Power Quality Conditioner (Unified Power Quality Conditioner, UPQC), as a comprehensive power quality compensation device, can not only compensate the reactive harmonic current brought by nonlinear and impact load, but also compensate the amplitude drop of grid voltage , to ensure high sine of the load voltage. [0003] However, in the left-to-right series UPQC structure, when there is a nonlinear load, the reactive power and harmonic current flow through the series-side converter, resulting in compensation voltage distortion, which seriously a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/18H02J3/16
CPCH02J3/01H02J3/18H02J3/16Y02E40/30
Inventor 谢锡锋唐岑凌春香王江伟罗宇强
Owner GUANGXI COLLEGE OF WATER RESOURCES & ELECTRIC POWER
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