基于半二次准则的连续时间自适应控制,用于鲁棒 LCL 滤波并网逆变器

IF 1.6 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Electrical Engineering Pub Date : 2024-08-21 DOI:10.1007/s00202-024-02664-6
Danish Khan, Mohammed Qais, Irfan Sami, Pengfei Hu
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引用次数: 0

摘要

并网逆变器对于将可持续能源无缝集成到电网中至关重要,但由于电力电子固有的开关操作,它们也会引入谐波。虽然电感-电容-电感(LCL)滤波器能有效限制这些谐波,提高系统的整体性能,但它们也面临着一系列挑战。这些挑战包括设计复杂性、导致系统不稳定的高频潜在共振以及电网阻抗变化。本文采用圆搜索算法优化 LCL 滤波器和控制系统参数,以解决设计复杂性问题。此外,还采用了基于时间的连续自适应滤波算法--半二次准则,以动态调整内部电容器电流反馈阻尼环路的增益和比例谐振控制器的增益,从而解决谐振和电网阻抗变化问题。这些算法旨在最小化基于总谐波失真的约束多目标优化函数,包括高频谐波失真以及测量电流和参考电流之间的绝对振幅误差。使用 MATLAB/SIMULINK 和实时 Typhoon HIL 仿真对系统进行了测试。结果表明,所提出的控制方案通过抑制高频段的共振频率,显著增强了阻尼区域。此外,研究结果表明,所提出的控制环路对电网侧阻抗的波动保持稳健性,可承受高达 400% 的增长和低至 75% 的下降。该系统实现了几乎可以忽略不计的稳态误差,并在参考电流阶跃变化过程中保持低于 0.1% 的瞬态误差。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Half-quadratic criterion-based continuous-time adaptive control for robust LCL-filtered grid-tied inverter

Grid-tied inverters are essential for seamlessly integrating sustainable energy resources into the electrical grid, yet they also introduce harmonics due to the inherent switching operations of power electronics. While inductance-capacitance-inductance (LCL) filters effectively limit these harmonics, enhancing overall system performance, they come with their own set of challenges. These include design complexity, potential resonance at high frequencies leading to system instability, and variations in grid impedance. This paper addresses the design complexities by employing a circle search algorithm to optimize the LCL filter and control system parameters. Additionally, a continuous time-based adaptive filtering algorithm, the half-quadratic criterion, is implemented to dynamically adjust the gain of the inner capacitor current feedback damping loop and the gains of a proportional resonant controller to address the resonance and grid impedance variation issues. These algorithms aim to minimize a constrained multi-objective optimization function based on total harmonic distortion, including high-frequency harmonic distortion and the absolute amplitude error between the measured and reference currents. The system is tested using MATLAB/SIMULINK and real-time Typhoon HIL simulations. The findings illustrate that the proposed control scheme significantly enhances the damping region by suppressing the resonance frequency in the higher frequency band. Furthermore, the results demonstrate that the proposed control loop maintains robustness against fluctuations in grid-side impedance, accommodating increases up to 400% and decreases down to 75%. The system achieves a nearly negligible steady-state error and maintains a transient error below 0.1% throughout step changes in reference current.

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来源期刊
Electrical Engineering
Electrical Engineering 工程技术-工程:电子与电气
CiteScore
3.60
自引率
16.70%
发文量
0
审稿时长
>12 weeks
期刊介绍: The journal “Electrical Engineering” following the long tradition of Archiv für Elektrotechnik publishes original papers of archival value in electrical engineering with a strong focus on electric power systems, smart grid approaches to power transmission and distribution, power system planning, operation and control, electricity markets, renewable power generation, microgrids, power electronics, electrical machines and drives, electric vehicles, railway electrification systems and electric transportation infrastructures, energy storage in electric power systems and vehicles, high voltage engineering, electromagnetic transients in power networks, lightning protection, electrical safety, electrical insulation systems, apparatus, devices, and components. Manuscripts describing theoretical, computer application and experimental research results are welcomed. Electrical Engineering - Archiv für Elektrotechnik is published in agreement with Verband der Elektrotechnik Elektronik Informationstechnik eV (VDE).
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