طراحی و کنترل سیستم تزریق توان آرایه فتوولتاییک متصل به شبکه فشار ضعیف با فیلتر LCL با استفاده از شکل‌دهی امپدانس مجازی
مجید حسین پور
1
(
گروه آموزشی مهندسی برق و کامپیوتر دانشگاه محقق اردبیلی
)
رسول اکبری
2
(
گروه مهندسی برق دانشگاه محقق اردبیلی
)
الهام سیفی
3
(
گروه مهندسی برق دانشگاه محقق اردبیلی
)
مهدی شاهپرستی
4
(
School of Technology and Innovations, Electrical Engineering, University of Vaasa, Vaasa, Finland.
)
کلید واژه: اینورتر متصل به شبکه, آرائه فتوولتائیک, امپدانس مجازی,
چکیده مقاله :
اینورترهای متصل به شبکه تجهیزات موثر در انتقال توان سیستم‌های تولید پراکنده و منابع انرژی تجدیدپذیر به شبکه می‌باشند. هارمونیک‌های جریان تولید شده ناشی از ریپل در لینک DC و کلیدزنی فرکانس بالا از جمله معایب اینورترهای متصل به شبکه هستند که با استفاده از فیلترهای مختلف از جمله فیلتر LCL کاهش می‌یابند. در کنار تشدید ذاتی فیلتر LCL، شبکه ضعیف با امپدانس شبکه متغیر منجر به ناپایداری سیستم انتقال توان می‌شود. در نتیجه، میراسازی مناسب برای حذف تشدید در فیلتر LCL و عملکرد انفعالی سیستم تزریق توان حائز اهمیت می‌باشد. هدف این مقاله، بهبود کیفیت توان تزریقی آرایه فتوولتائیک متصل به شبکه مبتنی بر فیلتر LCL با استفاده از صرفا یک سنسور جریان و بهبود پایداری و عملکرد انفعالی آن با استفاده از شکل‌دهی امپدانس‌های مجازی است. برای این منظور امپدانس خروجی سیستم بهساز توان آرایه فتوولتاییک به دو بخش فعال و پسیو تجزیه شده و بخش فعال با استفاده از امپدانس مجازی سری خنثی شده است. برای کاهش اثرات نامطلوب بکارگیری امپدانس مجازی سری، امپدانس مجازی موازی نیز بکار گرفته شده است. جزببات روند طراحی امپدانس مجازی سری و موازی ارائه شده و حساسیت سیستم تحلیل شده است. نهایتا، شبیه‌سازی در نرم افزار MATLAB پیاده‌سازی شده است که نتایج حاصله عملکرد صحیح و دقیق سیستم کنترلی در تزریق حداکثر توان آرایه فتوولتائیک به شبکه و کیفیت بسیار مطلوب جریان تزریقی به شبکه همراه با قابلیت حفظ پایداری در شبکه ضعیف نشان می‌دهد.
چکیده انگلیسی :
Grid-connected inverters play a crucial role in transmitting power from distributed production systems and renewable sources to the grid. However, these inverters often generate current harmonics due to high-frequency switching and DC link ripple. To address these issues, various filters, including the LCL filter, are employed. Yet, in situations with variable network impedance and LCL filter resonance in weak networks, instability can occur. This paper focuses on improving the power quality of grid-connected photovoltaic arrays using LCL filters, primarily through a current sensor and virtual impedance shaping. The paper divides the output impedance of the photovoltaic array power optimization system into an active and passive part. It neutralizes the active component by introducing a series virtual impedance and counteracts its adverse effects with parallel virtual impedance. The design process for both series and parallel virtual impedance is elaborated, and the system's sensitivity is thoroughly analyzed. To validate the proposed approach, extensive simulations have been carried out using MATLAB software. The simulations demonstrate the robust and precise performance of the control system in effectively injecting the maximum power generated by the photovoltaic array into the grid. Additionally, they showcase the high-quality current being injected into the grid and the system's capacity to maintain stability, even in a weak network environment.
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