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Active power-filter anti-saturation frequency adaptation repetition control method

A power filter and frequency adaptive technology, applied in the direction of active power filter, electrical components, circuit devices, etc., can solve the problems of controller performance deterioration, easy to produce saturation effect, compensation performance decline, etc., to achieve high engineering realization value , good harmonic compensation effect, reduce performance attenuation effect

Active Publication Date: 2018-04-27
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fractional-order repetitive control (FORC) is a control idea based on the inner membrane principle, which has the characteristics of high gain and slow time response, which makes it prone to saturation effects, which deteriorates the performance of the controller and causes the same decline in compensation performance

Method used

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  • Active power-filter anti-saturation frequency adaptation repetition control method
  • Active power-filter anti-saturation frequency adaptation repetition control method
  • Active power-filter anti-saturation frequency adaptation repetition control method

Examples

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Embodiment

[0036] figure 1 It is a schematic diagram of anti-saturation frequency self-adaptive repetitive control of an active power filter of the present invention.

[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, limiter module 9, compensator module 10, and PWM module 11. The control part of the active power filter. Among them, the...

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Abstract

The invention discloses an active power-filter anti-saturation frequency adaptation repetition control method. The method comprises the following steps of firstly, collecting a three-phase voltage ofa common coupling point, and using a phase-locked loop to acquire a voltage frequency fpll and a phase theta; then, extracting a harmonic wave signal instruction of a nonlinear load current iL by a harmonic wave detection module, adding with an output active current instruction acquired through a direct voltage controller, and then subtracting a sum of an output current feedback signal and a compensator output signal and acquiring an input error signal of a current controller; and then, through the current controller formed by a repetition controller and a PI controller, acquiring an output control amount; and finally, outputting a PWM wave modulation instruction signal acquired after a sum of the output control amount, a common coupling point voltage feedforward amount and a filter capacitance current feedforward amount passing through an active damping module passes through an amplitude limiter.

Description

technical field [0001] The invention belongs to the technical field of active power filter current control, and more specifically relates to an anti-saturation frequency self-adaptive repetitive control method of an active power filter. Background technique [0002] With the wide application of power electronic technology in various related fields of power system, the requirements of modern society for the safety and stability of power system and the quality of power supply are also increasing. In modern power systems, the application of power electronic equipment is more and more extensive, and various nonlinear, impact, fluctuation and asymmetrical loads have increased greatly, resulting in increasingly serious power quality pollution such as voltage fluctuations, voltage drops and harmonics. Harmonic current will cause local parallel resonance and series resonance in the power grid to amplify the harmonics, which will interfere with the control system and communication sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/18
CPCH02J3/01H02J3/1842Y02E40/20
Inventor 谢川李敏张刚邹见效徐红兵
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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