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

A power filter and frequency self-adaptive technology, which is applied in active power filtering and AC network to reduce harmonics/ripples, etc., can solve the problems of controller performance deterioration, saturation effect, and compensation performance degradation, etc., to achieve High engineering realization value, good harmonic compensation effect, easy digital realization effect

Active Publication Date: 2020-10-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Claims
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Problems solved by technology

Resonant control (RSC) 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 resonance control of active power filter
  • A method for anti-saturation frequency adaptive resonance control of active power filter
  • A method for anti-saturation frequency adaptive resonance control of active power filter

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Embodiment

[0036] figure 1 It is an anti-saturation frequency adaptive resonance control principle diagram of an active power filter of the present invention.

[0037] 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 frame part of 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, thereby forming 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, limiter module 9, compensator module 10, and PWM module 11. The control part of the active power filter. Among them, the current controller 7 such...

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Abstract

The invention discloses an anti-saturation frequency self-adaptive resonance control method of an active power filter. Firstly, the three-phase voltage of a 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 instruction of the DC voltage controller is added to the output active current instruction, and then subtracted from the sum of the output current feedback signal and the output signal of the compensator 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 adaptive resonance control method of an active power filter. Background technique [0002] With the wide application of various power electronic devices in the power system, the problem of harmonic distortion caused by nonlinear loads has become more and more serious, leading to serious harmonic pollution problems in the power grid. Compared with the traditional passive filter, the active power filter (APF) has the characteristics of good filtering characteristics, small size, flexible application, and is not easy to resonate with the power grid. It has gradually become the field of power grid harmonic compensation. Research hotspots. [0003] The performance of the active power filter (APF) largely depends on its current control strategy. In recent years, countless APF current control schemes have been proposed...

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 谢川李敏李凯邹见效徐红兵
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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