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Grid-side inverter resonance full-order sliding mode control method for harmonic distortion working condition of power grid voltage

A full-order sliding mode and harmonic distortion technology, applied in the field of power grids, can solve the problems of reduced sinusoidal degree and large fluctuation frequency, and achieve the effect of enhancing the suppression ability

Active Publication Date: 2018-01-19
HARBIN INST OF TECH
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Problems solved by technology

[0004] In order to better solve the problem that the sinusoidal degree of the grid-connected current waveform is reduced and the fluctuating frequency of active and reactive power is large under the grid voltage harmonic distortion working condition, the present invention provides a grid side for the grid voltage harmonic distortion working condition Resonant full-order sliding mode control method for inverters

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  • Grid-side inverter resonance full-order sliding mode control method for harmonic distortion working condition of power grid voltage
  • Grid-side inverter resonance full-order sliding mode control method for harmonic distortion working condition of power grid voltage
  • Grid-side inverter resonance full-order sliding mode control method for harmonic distortion working condition of power grid voltage

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[0055] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0056] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0057] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

[0058] Such as figure 1 As shown, a grid-side inverter resonant full-order sliding mode control method for grid...

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Abstract

The invention discloses a grid-side inverter resonance full-order sliding mode control method for the harmonic distortion working condition of the power grid voltage. According to the method, a mathematical model of a three-phase network side inverter is subjected to clark conversion, and the mathematical model of the grid-side inverter under a two-phase static alpha beta coordinate system is obtained. According to a full-order sliding mode surface model, a full-order sliding mode surface according to the mathematical model of the grid-side inverter is established. Resonance items are added into the full-order sliding mode surface so as to carry out resonance full-order sliding mode control. According to the method, by adopting the full-order sliding mode control method of the robustness of the DFIG network side inverter based on the enhanced parameter change of the model, a control method for introducing the quasi-proportional resonance into the full-order sliding mode is provided. Therefore, the suppression capacity of the full-order sliding mode control on the harmonic waves is enhanced. Meanwhile, the robustness of the full-order sliding mode control on the harmonic waves is not lost.

Description

technical field [0001] The invention relates to the field of power grids, in particular to a grid-side inverter resonance full-order sliding mode control method for grid voltage harmonic distortion working conditions. Background technique [0002] In the actual system, due to the tolerance, aging of components and the influence of system parasitic parameters, there are differences between the actual mathematical model and the model established according to the ideal conditions, regardless of the traditional PI control or PIR control, it is affected by the system The impact of parameter changes is relatively large, which can easily cause the system closed-loop pole to shift, and the stability of the entire system will decline. [0003] In recent years, as the proportion of the capacity of the distributed generation system in the power grid has increased year by year, harsh working conditions such as long wind power transmission lines, load asymmetry, unbalanced grid voltage, ...

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Application Information

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IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 郑雪梅李贺侯丽珺庞松楠李鑫陈若博邱凯庆
Owner HARBIN INST OF TECH
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