طراحی رؤیتگر غیر متمرکز برای اندازه‌گیری جریان سیال چندفازی بر اساس تئوری مقدار میانگین دیفرانسیل (DMVT)
محورهای موضوعی : مهندسی برق و کامپیوترابوالفضل وروانی فراهانی 1 , محسن منتظری 2
1 - دانشگاه شهید بهشتی
2 - دانشگاه شهید بهشتی
کلید واژه: سيستم اندازه‌گيري غیر متمرکزجريان چندفازينفت و گازابزار دقيق مجازيرؤيتگر غير خطي,
چکیده مقاله :
در اين مقاله يك رؤيتگر جديد براي اندازه‌گيري جريان چندفازي نفت و گاز ارائه شده كه نوآوري اصلي آن استفاده از تئوری دیفرانسیل میانگین مقدار (DMVT) در اندازه‌گيري جريان چندفازي ورودي پالايشگاه گازي مي‌باشد و شرايط كافي همگرايي با تبديل به نامعادله ماتریسی خطی (LMI) اثبات گرديده است. جريان چندفازي ورودي به پالايشگاه توسط يك سيستم غير خطي غير متمركز ليپشيتز كه متشكل از زيرسيستم‌هاي به هم مرتبط مي‌باشد، مدل گرديده و دبی مایع و گاز دوفازی با لحاظ ارتباط بين دو زيرسيستم در هر خط به صورت جداگانه تخمین زده می‌شود. این تخمین با شبيه‌سازي انجام‌شده در نرم‌افزار HYSYS با استفاده از داده‌های اندازه‌گیری در دسترس واقعي در يك پالايشگاه گازي موجود در پارس جنوبي مقایسه شده و مشاهده می‌گردد که نتایج حاصل بر ارقام عملياتي موجود منطبق می‌باشد. مطابق با استاندارد MPMS-API دقت اندازه‌گيري براي مبناي مبادلات مي‌بايست بهتر از 15/0% باشد كه در روش جديد دقت اندازه‌گيري 1/0% است كه همين امر نشان‌دهنده کارایی روش ارائه‌شده می‌باشد.
In this paper, a new decentralized observer scheme based on combination of two large scale interconnected subsystems is proposed. It discusses design problem of flow measurement by partial differential equation (PDE) observer for state estimation of a quasi linear system without external disturbance and without measurement noise. The measurement system is decomposed into two subsystems according to their locations, condensate and gas pipes, such that each subsystem has interconnection with other. By using matrix form Navier Stocks equations and Lyapunov technique, inequality at each subsystem, a Lyapunov-based design of PDE observer is developed such that the resulting estimation error system is exponentially stable and presented in terms of standard linear matrix inequalities (LMIs). The first mean value theory for integrals is used in the observer design development. The proposed method may be used as a backup for existing systems in the operation field or as a main system for new established plants.
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