Danish Khan, Mohammed Qais, Irfan Sami, Pengfei Hu
{"title":"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","authors":"Danish Khan, Mohammed Qais, Irfan Sami, Pengfei Hu","doi":"10.1007/s00202-024-02664-6","DOIUrl":null,"url":null,"abstract":"<p>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.</p>","PeriodicalId":50546,"journal":{"name":"Electrical Engineering","volume":null,"pages":null},"PeriodicalIF":1.6000,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Half-quadratic criterion-based continuous-time adaptive control for robust LCL-filtered grid-tied inverter\",\"authors\":\"Danish Khan, Mohammed Qais, Irfan Sami, Pengfei Hu\",\"doi\":\"10.1007/s00202-024-02664-6\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>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.</p>\",\"PeriodicalId\":50546,\"journal\":{\"name\":\"Electrical Engineering\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.6000,\"publicationDate\":\"2024-08-21\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Electrical Engineering\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://doi.org/10.1007/s00202-024-02664-6\",\"RegionNum\":4,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ENGINEERING, ELECTRICAL & ELECTRONIC\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Electrical Engineering","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1007/s00202-024-02664-6","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
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.
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).