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A method for anti-saturation frequency adaptive repetitive control of active power filter

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

Active Publication Date: 2020-10-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A method for anti-saturation frequency adaptive repetitive control of active power filter
  • A method for anti-saturation frequency adaptive repetitive control of active power filter
  • A method for anti-saturation frequency adaptive repetitive control of active power filter

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Experimental program
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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 self-adaptive repetitive control method. First, the three-phase voltage of the common coupling point is collected, and the voltage frequency f is obtained by using a phase-locked loop. pll and phase θ; then, the harmonic detection module extracts the nonlinear load current i L The harmonic signal command of the DC voltage controller is added to the output active current command, and then subtracted from the sum of the output current feedback signal and the compensator output signal to obtain the input error signal of the current controller; The current controller formed with the PI controller obtains the output control quantity; finally, the output control quantity, the voltage feedforward quantity of the common coupling point and the filter capacitor current feedforward quantity through the active damping module are added and then passed through the limiter 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 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 Patents(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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