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Improved broadband adaptive repetitive control method of active power filter

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

Inactive Publication Date: 2017-03-22
UNIV OF ELECTRONIC 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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  • Improved broadband adaptive repetitive control method of active power filter
  • Improved broadband adaptive repetitive control method of active power filter
  • Improved broadband adaptive repetitive control method of active power filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0036] figure 1 It 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 part. Among them, figure 1 The solid framed part is the control part.

[0038] The main circuit part is composed of inverter main circuit 1, LCL filter 2, non-linear load 3. The inverter main circuit 1 is connected to the power grid through the LCL filter 2, and the non-linear load 3 is directly connected to the power grid to form a complete main circuit of the 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, PWM module 9, constituting the control part of the active power filter.

[0040] Below in conjunction with the present invention figure 1 Each module in the detailed description is as follows:

[0041] An improve...

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PUM

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Abstract

The invention discloses an improved broadband adaptive repetitive control method of an active power filter. The improved broadband adaptive repetitive control method comprises the steps of firstly collecting three-phase voltage of a common coupling point and obtaining a frequency fp11 and a phase theta of the voltage by using a phase-locked loop; extracting a harmonic signal instruction of nonlinear load current iL by a harmonic detection module, adding an active current output instruction obtained through a DC voltage controller and subtracting an output current feedback signal to obtain an input error signal of a current controller; obtaining an output control quantity through the current controller formed by a repetitive controller and a PI controller; and finally obtaining a PWM wave modulation instruction signal through addition of the output control quantity, a voltage feedforward quantity of the common coupling point and a capacitance current feedforward quantity of the filter passing through an active damping module.

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 active power filters. Background technique [0002] In modern power systems, power electronic equipment is more and more widely used, such as steel plants, non-ferrous metallurgical plants, large-scale commercial districts and other places, and a large number of frequency converters are used in industrial production. Various non-linear loads in the power system can cause high penetration harmonic pollution. Harmonic current will increase power loss, deteriorate the quality of the voltage waveform, mislead the metering device, and cause resonance and interference. Therefore, how to effectively eliminate power harmonics and improve power quality is a common concern for power supply departments, power users and power equipment manufacturers. [0003] The performance of the active pow...

Claims

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Application Information

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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 ELECTRONIC SCI & TECH OF CHINA
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