مدل سازی در مهندسی

مدل سازی در مهندسی

بهینه‌سازی استراتژی کنترل اینورتر در سیستم‌های فتوولتائیک متصل به شبکه با روش کنترل توان مستقیم پیش‌بین

نوع مقاله : مقاله پژوهشی

نویسندگان
دانشکده مهندسی برق و کامپیوتر، دانشگاه سمنان، سمنان، ایران
چکیده
کنترل پیش‌بین مبتنی بر مدل (MPC) به دلیل توانایی در حل محدودیت‌های سیستم-های غیرخطی بسیار مورد توجه قرار گرفته‌است. در این مقاله نیز یک روش کنترل مستقیم پیش‌بین (MPDPC) برای بهبود عملکرد اینورتر دو‌ سطحی یک سیستم فتوولتائیک متصل به شبکه پیشنهاد و استفاده‌می‌شود. برای این منظور ابتدا یک مدل توان مستقیم پیش‌بین تعیین و سپس تابع هزینه‌ای متشکل از تنظیم کیفیت توان و بهینه‌سازی فرکانس کلیدزنی با ادغام دو عبارت جریمه‌ی قابل تنظیم در پارامترهای سیستم، جهت انتخاب بردارهای ولتاژ بهینه و سویچینگ اینورتر اعمال می‌شود. نتایج شبیه‌سازی در نرم-افزار متلب، کارآیی مناسب روش کنترل پیشنهادی در دو حالت عملکرد دائمی و دینامیکی سیستم را نمایان می‌کند به طوری که کاهش هارمونیک جریان‌های خروجی از مقدار 98/8 % به 11/1 % قابل مشاهده می‌باشد. کلیدزنی در المان‌های الکترونیک قدرت اینورتر نیز بهینه شده و فرکانس کلیدزنی از مقدار 12650 هرتز به 8700 هرتز کاهش می‌یابد. این امر باعث کاهش تلفات و همچنین افزایش طول عمر اینورتر خواهد شد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Optimization of Grid-Connected Inverter Performance in Photovoltaic Systems with Model Predictive Direct Power Control

نویسندگان English

Milad Jafari Chashmi
Hamid Reaz Izadfar
Faculty of Electrical and Computer Engineering, Semnan University, Semnan, Iran
چکیده English

Model Predictive Control (MPC) is of great interest due to its ability to solve the constraints of nonlinear systems. In this article, the Model Predictive Direct Power Control (MPDPC) method is proposed for a two-level inverter grid-connected in a photovoltaic system. First, a predictive direct power model is determined, and then a cost function consisting of two parts of power quality regulation and switching frequency optimization by adjusting the system parameters, is used to select the optimal voltage vectors to improve the inverter performance. The simulation results in MATLAB software show the appropriate efficiency of the proposed control method in two modes of permanent and dynamic system operation, such that the harmonic reduction of the output currents from 8.98% to 1.11% is visible. The switching in the power electronic elements of the inverter was also optimized, and the switching frequency was reduced from 12650 Hz to 8700 Hz, which will reduce losses and also increase the life of the inverter.

کلیدواژه‌ها English

Inverter
Flexible active power
Photovoltaic
Switching frequency
Model Predictive Direct Power Control
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دوره 24، شماره 85
در حال تکمیل شدن
تابستان 1405
صفحه 121-136

  • تاریخ دریافت 11 اسفند 1403
  • تاریخ بازنگری 10 خرداد 1404
  • تاریخ پذیرش 16 تیر 1404