مدل‌سازی و کنترل سیستم تزریق توان پیل سوختی به شبکۀ تک‌فاز در شرایط شبکۀ ضعیف و هارمونیکی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار، گروه مهندسی برق، دانشکدۀ فنی مهندسی‌، دانشگاه محقق اردبیلی، اردبیل‌، ایران

2 کارشناس ارشد، گروه مهندسی برق، دانشکدۀ فنی مهندسی‌ـ دانشگاه محقق اردبیلی‌ـ اردبیل‌ـ ایران

3 دانشیار، گروه مهندسی برق، دانشکدۀ فنی مهندسی‌ـ دانشگاه محقق اردبیلی‌ـ اردبیل‌ـ ایران

4 پژوهشگر، دانشکدۀ مهندسی برق و الکترونیک‌ـ دانشگاه کالج دوبلین‌ـ دوبلین‌ـ ایرلند

10.22059/ses.2024.374487.1061

چکیده

در سال‏های اخیر پیل‏های سوختی به دلیل مزایای زیست‌محیطی و کاربردهای آن در سیستم‏های توان تولید پراکنده مورد توجه قرار گرفته‏اند. پیل‏های سوختی انواع مختلفی دارند که از میان آن‏ها پیل سوختی غشای تبادل پروتون (PEMFC) در اتصال به شبکۀ قدرت بیشتر مورد استفاده قرار گرفته است. در اتصال پیل‏های سوختی به شبکۀ قدرت از اینورترهای منبع ولتاژ استفاده می‏شود. اینورترهای متصل به شبکه به دلیل فرکانس کلیدزنی بالا هارمونیک‏های مرتبه بالا تولید می‏کنند. برای کاهش هارمونیک‏های کلیدزنی و افزایش کیفیت جریان تزریقی به شبکه از فیلترهای LCL استفاده‏ می‏شود. فیلترهای LCL عملکرد مطلوبی در کاهش هارمونیک‏های کلیدزنی دارند، اما یکی از مشکلات اصلی آن‏ها تشدید ذاتی آن‏ها است که ممکن است باعث ناپایداری سیستم شود. وقتی از کنترل دیجیتال برای کنترل اینورترهای متصل به شبکه استفاده می‏شود، به دلیل تأخیرهای کنترلی که شامل تأخیرهای محاسباتی و تأخیر مدولاسیون پهنای پالس است، پایداری اینورتر در برابر تغییرات امپدانس شبکه تضعیف می‏شود. در این مقاله از روش فیدبک جریان خازن برای میرایی تشدید ذاتی فیلتر LCL و یک جبران‏کنندۀ پیش‏فاز در مسیر فیدبک جریان خازن برای جبران‏ تأخیر کنترل برای سیستم بهساز توان پیل سوختی متصل به شبکه استفاده شده است. برای بررسی صحت عملکرد روش پیشنهادی یک روش طراحی گام‌به‌گام برای جبران‏ساز پیش‏فاز و پارامترهای حلقه بسته سیستم ارائه شده است. نتایج شبیه‏سازی سیستم بهساز توان پیل سوختی متصل به شبکه با فیلتر LCL در نرم‌افزار MATLAB/Simulink انجام شده است که صحت عملکرد روش پیشنهادی را نشان می‏دهد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Modelling and Control of Fuel Cell Power Injecting System to Single-Phase Weak and Harmonically Network

نویسندگان [English]

  • Majid Hosseinpour 1
  • Elham Seifi 2
  • Abdolmajid Dejamkhooy 3
  • Shahab Sajedi 4
1 Associate Professor, Department of Electrical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran
2 MSc, Department of Electrical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran
3 Associate professor, Department of Electrical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran
4 Researcher, School of Electrical and Electronic Engineering, University College Dublin, Dublin, Ireland
چکیده [English]

Fuel cells have been noticed by researchers due to their high efficiency, low pollution, and high-power density in distributed generation systems. Grid-connected inverters are considered vital elements for effectively connecting renewable energy sources and distributed generation system applications. Ripple-induced current harmonics in DC link and high switching frequency are the disadvantages of grid-connected inverters that are reduced by LCL filters. However, the intrinsic resonance in the LCL filter leads to instability of the power transmission system. As a result, suitable damping is essential for removing resonance in the LCL filters. LCL filters are utilized to reduce switching harmonics and increase the quality of the grid-injected current. The LCL-filters can lead to resonance and instability despite their capability to attenuate harmonics. When digital control is utilized to control grid-connected inverters, the stability of the inverter is weakened against grid impedance changes due to control delays that include computation as well as pulse width modulation delays. In this paper, the design, control, and stability analysis of the inverter-based power conditioner, which is connected to the low voltage grid via an LCL filter, is presented to manage the power flow of the PEMFC. For this aim, the capacitor current feedback active damping procedure is used to alleviate the resonance phenomena caused by LCL filter, and a phase compensator in the is applied to compensate for the unwanted effects of the control delay of the grid-connected fuel cell power conditioning system. To investigate the proficiency of the proposed scheme, the design of each section is presented for the phase compensation and the parameters of the closed loop system under study. The simulation results of the LCL-based grid-connected fuel cell power conditioning system have been performed in MATLAB/Simulink, depicting the suggested method's accuracy.

کلیدواژه‌ها [English]

  • Grid-connected inverter
  • Fuel cell
  • LCL filter
  • Active damping
  • Digital control delay

مراجع

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فصلنامه سیستم های انرژی پایدار
دوره 2، شماره 4
مهر 1402
صفحه 329-352

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