An improved broadband adaptive repetitive control method for active power filters

A power filter and repetitive control technology, which is applied in active power filtering and AC network to reduce harmonics/ripples, etc., can solve the problems of FORC parameter grid frequency range deterioration, compensation performance degradation, etc., and achieve high engineering realization value , the effect of good harmonic compensation effect

Inactive Publication Date: 2018-12-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional coefficient update implementation method will cause the FORC parameters to deteriorate in some specific grid frequency ranges
lead to the same decline in compensation performance

Method used

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  • An improved broadband adaptive repetitive control method for active power filters
  • An improved broadband adaptive repetitive control method for active power filters
  • An improved broadband adaptive repetitive control method for active power filters

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Experimental program
Comparison scheme
Effect test

Embodiment

[0036] figure 1 Is the control block diagram of the active power filter.

[0037] In this embodiment, in this embodiment, as figure 1 As shown, the active power filter includes two parts, the main circuit and the control, where, figure 1 The solid line frame part is the control part.

[0038] The main circuit part is composed of inverter main circuit 1, LCL filter 2 and nonlinear load 3. The inverter main circuit 1 is connected to the power grid through the LCL filter 2, and the nonlinear load 3 is directly connected to the power grid, thereby forming a complete main circuit of an active power filter.

[0039]The control part includes: PLL phase-locked loop module 4, harmonic calculation module 5, DC voltage control module 6, current controller 7, active damping module 8, and PWM module 9, which constitute the control part of the active power filter.

[0040] Below in conjunction with the present invention figure 1 Each module is described in detail, as follows:

[0041]...

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Abstract

The invention discloses an improved broadband adaptive repetitive control method for an active power filter. Firstly, the three-phase voltage of the common coupling point is collected, and the voltage frequency fpll and phase θ are obtained by using a phase-locked loop; then, the harmonic detection module extracts the nonlinear The harmonic signal command of the load current iL is added to the output active current command obtained through the DC voltage controller, and then subtracted from the output current feedback signal to obtain the input error signal of the current controller; then through the repetitive controller and the PI controller The formed current controller obtains the output control quantity; finally, the output control quantity, the common coupling point voltage feedforward quantity and the filter capacitor current feedforward quantity through the active damping module are added to obtain the PWM wave modulation command signal.

Description

technical field [0001] The invention belongs to the technical field of active power filter current control, and more specifically relates to an improved broadband adaptive repetitive control method for an active power filter. Background technique [0002] In modern power systems, power electronic equipment is more and more widely used, such as iron and steel plants, non-ferrous metallurgical plants, large commercial areas and other places, and a large number of frequency converter speed control devices are used in industrial production. Various non-linear loads in power systems lead to highly penetrating harmonic pollution. Harmonic currents increase power loss, deteriorate the quality of voltage waveforms, mislead metering devices, and cause resonance and interference. Therefore, how to effectively eliminate power harmonics and improve power quality is a common concern of power supply departments, power users and power equipment manufacturers. [0003] The performance of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/20
Inventor 谢川李敏彭超郑宏邹见效徐红兵
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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