Anti-saturation frequency adaptive resonance control method for active power filter

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

Active Publication Date: 2018-05-15
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Abstract
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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, wh

Method used

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  • Anti-saturation frequency adaptive resonance control method for active power filter
  • Anti-saturation frequency adaptive resonance control method for active power filter
  • Anti-saturation frequency adaptive resonance control method for active power filter

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Embodiment

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

[0037] In this example, if 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 current controller 7 such ...

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Abstract

The invention discloses an anti-saturation frequency adaptive resonance control method for an active power filter. The method comprises the steps that the three-phase voltage of a common coupling point is acquired, and the voltage frequency fpll and the phase theta are acquired by using a phase-locked loop; a harmonic detection module extracts the harmonic signal command of nolinear load current iL; the harmonic signal command is added with an output active current command acquired through a direct current voltage controller, and then is subtracted from the sum of an output current feedback signal and a compensator output signal to acquire the input error signal of a current controller; the current controller composed of a resonant controller and a PI controller is used to acquire the output control amount; and finally, after the output control amount, the voltage feedforward amount of the common coupling point, and the filter capacitor current feedforward amount through an active damping module are added together, a PWM wave modulation command signal is acquired through a 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 adaptive resonance control method of an active power filter. Background technique [0002] With the wide application of various power electronic devices in power systems, the problem of harmonic distortion caused by nonlinear loads is becoming more and more serious, which leads 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 a popular choice in the field of power grid harmonic compensation Research hotspots. [0003] The performance of an active power filter (APF) largely depends on its current control strategy. Numerous APF current control schemes have been ...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/20
Inventor 谢川李敏李凯邹见效徐红兵
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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