روشی جامع برای مدل سازی عمومی فضای حالت مبدل های چندسطحی متوالی متصل به شبکه
محورهای موضوعی : انرژی های تجدیدپذیر
حسن منافی میرعلیلو
1
,
مهدی سلیمی
2
,
جعفر سلطانی
3
,
عادل اکبری مجد
4
1 - دانشکده مهندسی برق- واحد اردبیل، دانشگاه آزاد اسلامی، اردبیل، ایران
2 - دانشکده مهندسی برق- واحد اردبیل، دانشگاه آزاد اسلامی، اردبیل، ایران
3 - دانشکده مهندسی برق و کامپیوتر- دانشگاه صنعتی اصفهان، اصفهان، ایران
4 - دانشکده فنی و مهندسی- دانشگاه محقق اردبیلی، اردبیل، ایران
کلید واژه: مدل فضای حالت, اینورتر چندسطحی, کنترل غیر‌خطی, مبدل‌های پل H,
چکیده مقاله :
در این مقاله برای مدل‌سازی فضای حالت عمومی مبدل چندسطحی سری متصل به شبکه، روشی جامع پیشنهاد شده است. در اینورترهای چندسطحی به دلیل غیر‌خطی بودن رفتار آنها، برای تضمین پایداری سیستم در حوزه کاری وسیع استفاده از کنترل کننده غیر‌خطی اجتناب ناپذیر است. برای همین منظور مدل‌سازی فضای حالت جهت طراحی این نوع کنترل کننده ها لازم است. مدل پیشنهاد شده برای حالت کلی مبدل با تعداد n پل ارائه شده است. برای راستی آزمایی مدل فضای حالت به دست آمده، یک نمونه آزمایشگاهی از مبدل چندسطحی با دوپل طراحی و ساخته شده و نتایج مربوط به شبیه‌سازی مدل فضای حالت به دست آمده با نتایج شبیه‌سازی مبدل متصل به شبکه و نتایج عملی مقایسه شده است. مقایسه نتایج نشان‌دهنده درستی عملکرد مدل است. همچنین شبیه‌سازی های مربوطه توسط نرم افزار تخصصی EMTDC/PSCAD انجام یافته است.
In this paper, a novel approach for comprehensive state-space modelling of the grid connected multi-level inverters is proposed. Details of the developed method is presented using cascaded H-bridge converters, however it can be applied to other topologies of the grid connected inverters as well. In multi-level converters, due to their nonlinear characteristic, application of the nonlinear controllers is more beneficial to ensure stability of the system in a wide range of operation. Hence, the state-space model is required to design a nonlinear controller. To achieve converter model, it is divided into some sub-circuits considering different operational intervals in a switching cycle. To verify accuracy and effectiveness of the obtained state-space model, a laboratory setup of a multi-level. Converter with two H-bridges has been designed and implemented. Also, results of the developed state-space model has been compared with the simulation/experimental results of the grid-connected converter. According to the simulation and experimental result, accuracy of the model is verified. It should be noted that all of the simulations have been performed by EMTDC/PSCAD toolbox.
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