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Self-adaptive repetitive control method for active power filter

A power filter and repetitive control technology, applied in active power filtering, harmonic reduction devices, AC networks to reduce harmonics/ripples, etc., can solve problems such as unstable compensation effects of active power filters, and achieve Good real-time performance, good restraint, and small storage space

Active Publication Date: 2013-01-16
北京京仪椿树整流器有限责任公司
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  • Abstract
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Problems solved by technology

[0012] The technical problem to be solved by the present invention is to provide an adaptive repetitive control method for active power filters to solve the problem of unstable compensation effect of active power filters caused by grid frequency disturbances

Method used

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  • Self-adaptive repetitive control method for active power filter
  • Self-adaptive repetitive control method for active power filter
  • Self-adaptive repetitive control method for active power filter

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Embodiment Construction

[0032] The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments.

[0033] Such as figure 2 Shown is a schematic diagram of the adaptive repetitive control method for an active power filter of the present invention. Among them, r is the reference current signal, y is the actual output current signal, e is the error signal between the reference current and the actual output current, Ur is the output value of the current error signal after the variable cycle repeating controller, and d is the external periodic disturbance signal , z is the variable of the z-transform of the discrete-time system.

[0034] When implementing the present invention, the active power filter includes a grid detection module 202 and a cycle-variable repetition control register module 201 . The grid detection module 202 includes a grid phase lock unit and a grid phase angle zero-crossing detection unit. Through the grid phase-locking...

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Abstract

The invention discloses a self-adaptive repetitive control method for an active power filter. The method comprises the following steps of: acquiring a power grid voltage signal and performing phase lock on power grid voltage; detecting a starting point of a fundamental period of the power grid voltage; recording a sampling point number K in the fundamental period of the power grid voltage; judging whether the sampling point number K changes or not; adjusting a repetitive control register parameter N according to the sampling point number K; and calling a corresponding number of count values to perform repetitive control calculation according to the repetitive control register parameter N. By the method, the problem that the compensation effect of the active power filter is unstable because of power grid frequency disturbance is solved.

Description

technical field [0001] The invention relates to the technical field of power quality detection and control, in particular to an adaptive repetitive control method for an active power filter. Background technique [0002] In recent years, with the rapid development of modern power electronics technology, the power electronic equipment and nonlinear loads such as generators, transformers, and frequency converters in the power grid system have increased sharply, resulting in the continuous increase of voltage and current harmonic levels in the power grid. does not exist in . As the power industry's requirements for power quality increase year by year, high-performance power filters are receiving more and more attention. The shunt active power filter (APF) has been widely researched and applied in recent years because it is very suitable for harmonic control and reactive power compensation of current source harmonic sources. [0003] In order to make the shunt active power fil...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40Y02E40/22Y02E40/20
Inventor 马建立谢斌丁海昌臧磊权好殷玉洋张霞
Owner 北京京仪椿树整流器有限责任公司
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