طرح کنترلی توزیع شده مبتنی بر کنترل مدل پیش‌بین جهت تأمین توان در یک ریزشبکه DC مستقل
محورهای موضوعی : مهندسی برق و کامپیوتر
آرش عابدی
1
(دانشگاه صنعتی نوشیروانی بابل)
بهروز رضایی
2
(دانشگاه صنعتی نوشیرانی بابل)
علیرضا خسروی
3
(دانشگاه صنعتی نوشیرانی بابل)
مجید شهابی
4
(دانشگاه صنعتی نوشیروانی بابل-دانشکده مهندسی برق و کامپیوتر)
کلید واژه: ریزشبکه DCکنترل مدل پیش‌بینتحلیل پایداری لیاپانوف,
چکیده مقاله :
در این مقاله، یک طرح کنترلی جامع برای یک ریزشبکه DC مستقل، شامل توربین بادی متصل به ژنراتور سنکرون مغناطیس دایم، واحد ذخیره‌سازی انرژی الکتریکی و بارهای الکتریکی متغیر ارائه گردیده است. منابع انرژی از طریق مبدل‌های DC باک و باک- بوست به شین مشترک متصل می‌باشند. در لایه اول کنترلی کنترل‌کننده‌های توزیع‌شده محلی قرار دارند. این کنترل‌کننده‌ها به واسطه یک تحلیل پایداری لیاپانوف طراحی شده و علاوه بر تضمین پایداری، جریان و ولتاژ تزریقی به شبکه را از طریق کنترل تابع سوئیچینگ مبدل‌ها تنظیم می‌نمایند. کنترل‌کننده‌های ثانویه به صورت نامتمرکز بوده و میزان مشارکت هر واحد را در تأمین بار تعیین می‌نمایند. در این لایه کنترلی یک طرح کنترل‌کننده مدل پیش‌بین برای نیروگاه بادی پیشنهاد شده است و یک کنترل‌کننده تناسبی- انتگرالی با هدف تثبیت ولتاژ شین، مقادیر مرجع جریان را برای کنترل‌کننده محلی تعیین می‌نمایند. علاوه بر سادگی، سهولت در اجرا و سرعت عمل، استقلال کامل کنترل‌کننده‌های ثانویه و حداقل نیاز به بستر ارتباط داده در کنترل‌کننده‌های محلی و عدم نیاز به تغییر ساختار کنترلی در برنامه توسعه از ویژگی‌های مهم طرح کنترلی پیشنهادی می‌باشند. همچنین صحت عملکرد کنترل‌کننده‌ها با شبیه‌سازی در نرم‌افزار Matlab و برای موارد مطالعاتی مختلف مورد ارزیابی و تأیید قرار گرفته‌اند.
In this paper, a control scheme is presented for an isolated DC microgrid including wind turbine connected to permanent magnet synchronous generator, electrical energy storage unit, and variable electrical loads. Energy sources are connected to a common bus through DC buck and buck-boost converters. The local distributed controllers are located in the first control layer. These controllers are designed based on a Lyapunov stability analysis and thereby its stability is guaranteed. Moreover, the current and voltage, injected to the network, are adjusted by controlling the switching functions of the converters. The decentralized secondary controllers determine the contribution of the local units for supplying the local loads. In this control layer, a model predictive controller for the wind generation unit as well as a proportional-integral controller for preserving the bus voltage are proposed to determine the reference currents for the local controllers. In addition to the practical simplicity, complete isolation of the secondary controllers, minimum requirements to data transfer, and providing a control structure without any need to change in development plan are the important advantages of the proposed control scheme. The performance of the controllers is investigated and verified using the simulations in MATLAB software performed for different cases.
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