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Frequency-adaptation improved resonant control method for active power filter

A technology of frequency self-adaptation and power filter, which is applied in active power filter and AC network to reduce harmonic/ripple, etc. It can solve problems such as narrow frequency adaptation range, lower system stability, and affect controller effect. Achieve the effect of simple implementation, improving stability and maintaining effect

Inactive Publication Date: 2015-03-04
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0003] Chinese invention patent "A Parallel Quasi-Proportional Resonant Active Power Filter and Control Method" (publication number: 103683292A) discloses a frequency-adaptive quasi-proportional resonant control method based on a phase-locked loop. Proportional resonant controller, the high frequency band of the controller will introduce a 90° phase lag to the system, which reduces the stability of the system and limits the improvement of the system bandwidth
Chinese invention patent "Quasi-proportional resonance control method and control system of parallel active power filter" (publication number: 102931660A) discloses a frequency adaptive quasi-proportional resonance control method in the continuous domain, when using DSP (digital signal processing ) is implemented, it is necessary to discretize the parameters through different discretization methods, which will introduce errors and affect the controller effect
Chinese invention patent "Active Power Filter Selective Harmonic Compensation Control Method" (publication number: 103427419A) discloses an active power filter selective harmonic compensation control method based on an adaptive resonance controller for control frequency adjustment , the frequency adaptation range of this method is narrow, only 0.5Hz

Method used

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  • Frequency-adaptation improved resonant control method for active power filter
  • Frequency-adaptation improved resonant control method for active power filter
  • Frequency-adaptation improved resonant control method for active power filter

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Embodiment

[0035] figure 1 Is the control block diagram of the active power filter.

[0036] 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 part below the dotted line is the control part.

[0037] The main circuit part is composed of three-level VSI 1, LCL filter 2, and nonlinear load 3. The three-level VSI 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.

[0038] The control part includes: PLL phase-locked loop module 4, abc-dq0 coordinate transformation module 5, DC voltage control module 6, harmonic current detection module 7, current control module 8, grid voltage feedforward module 9, dq0-abc coordinate transformation module 10. The SPWM module 11 constitutes the control part of the active power filter.

[0039] figure 2 It is a flow chart of the ...

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Abstract

The invention discloses a frequency-adaptation improved resonant control method for an active power filter. Through changing the central frequency of a resonant controller in real time through a phase-locked loop, the disadvantage of narrow frequency adaptation range of an existing control method is overcame, and the frequency adaptation range is improved; according to the actual configuration, through arranging an improved resonant controller or an improved quasi resonant controller in a circuit controller, the resonant control effect is kept, and the system stability is improved; the controller is directly designed at a discrete domain, and accordingly the error due to converting to the discrete domain from a continuous domain is avoided.

Description

technical field [0001] The invention belongs to the technical field of active power filter current control, and more specifically relates to a frequency adaptive improved resonance control method of an active power filter. Background technique [0002] With the rapid development of power electronics technology, the application of nonlinear loads has led to the problem of harmonic pollution in the power grid. In order to solve the increasingly serious harmonic problem in the power grid, a large number of active power filters have been developed. However, in order to improve the harmonic compensation accuracy of active power filters, current control technology has become a research hotspot. [0003] Chinese invention patent "A Parallel Quasi-Proportional Resonant Active Power Filter and Control Method" (publication number: 103683292A) discloses a frequency-adaptive quasi-proportional resonant control method based on a phase-locked loop. Proportional resonant controller, the h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/20
Inventor 谢川李凯邹见效杨惠雯
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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