Compound control method for compensating unbalanced harmonics

A composite control and harmonic technology, which is applied in reactive power compensation, harmonic reduction devices, and AC networks to reduce harmonics/ripples, etc. It can solve problems such as complex calculation and increased computational burden.

Pending Publication Date: 2021-05-18
GUANGXI COLLEGE OF WATER RESOURCES & ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a compound control method for compensating unbalanced harmonics, thereby overcoming the shortcomings of traditional APF control that the calculation burden increases with the increase of the harmonic order and the calculation is complicated

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  • Compound control method for compensating unbalanced harmonics
  • Compound control method for compensating unbalanced harmonics
  • Compound control method for compensating unbalanced harmonics

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Embodiment Construction

[0033] The technical solutions in the present invention are clearly and completely described below in combination with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, 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 creative efforts fall within the protection scope of the present invention.

[0034] Such as figure 1 A schematic diagram of the structure of the APF with two bridge arms connected to the power grid is shown. The APF with two bridge arms is connected to the power grid, and the loads include harmonic loads and unbalanced loads. When the APF of the two bridge arms is not working, the grid-side current provides the unbalanced harmonic current required by the load, so the grid-side current is also an unbalanced harmonic current. When the two-arm APF works...

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Abstract

The invention discloses a compound control method for compensating unbalanced harmonics, and relates to the technical field of electric energy quality governance. The method comprises the steps of calculating the reference quantity of the active and reactive power control in the improved DQ decoupling control according to the required phase information, and adding the improved DQ decoupling to generate a first modulation wave; calculating the active and reactive components of each harmonic according to the required phase information, and adding a specific harmonic control loop to generate a second modulation wave; and superposing and sending the first modulation wave and the second adjustment harmonic to a PWM modulation module to generate a switching signal required by a two-bridge-arm APF. Through the improved DQ decoupling control, the negative sequence and reactive reference quantities are added into the active and reactive components of traditional DQ control, so that the direct current side capacitor voltage can be stabilized, and the fundamental wave negative sequence current and reactive current are compensated; and meanwhile, the specific sub-harmonics in a traditional APF are introduced to be compensated into the two-bridge-arm APF, and the high-content harmonics are compensated, so that the method has good negative sequence, reactive power and harmonic compensation performances.

Description

technical field [0001] The invention belongs to the technical field of power quality control, and in particular relates to a compound control method for compensating unbalanced harmonics. Background technique [0002] With the rapid development of economy, nonlinear power electronic conversion devices have been widely used in the industrial field, and the harmonics generated by nonlinear power electronic devices have seriously affected the power quality of power systems. Active power filter (active power filter, APF) is recognized as a new type of power electronic device that can dynamically suppress harmonic pollution of the power grid. compensate. [0003] In order to better compensate the harmonic current, the detection of harmonic current must be fast and accurate at the same time, that is, the harmonic detection technology with good real-time and dynamic performance is an important prerequisite for the efficient operation of active power filters. Therefore, the harmon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/18H02J3/26
CPCH02J3/01H02J3/18H02J3/26Y02E40/30Y02E40/50Y02E40/40
Inventor 谢锡锋张帅邓海鹰左江林罗宇强
Owner GUANGXI COLLEGE OF WATER RESOURCES & ELECTRIC POWER
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