طراحی سیستم کنترل یک‌پارچه بویلر- توربین بر مبنای کنترل‌کننده مد لغزشی بهبودیافته
محورهای موضوعی : مهندسی برق و کامپیوترسياوش گل محمدي 1 , رحمت‌الله هوشمند 2 , محمد عطائی 3
1 - دانشگاه اصفهان
2 - دانشگاه اصفهان
3 - دانشگاه اصفهان
کلید واژه: نیروگاه بخاری کنترل مد لغزشی فرکانس فشار بخار تروتل,
چکیده مقاله :
برای مشارکت نيروگاه بخاري در تنظیم فرکانس شبکه علاوه بر تولید بار پایه، باید بويلر و توربين به‌طور هماهنگ کنترل شوند. عدم کنترل هماهنگ بویلر- توربین سبب ناپایداری، نوسانی‌شدن توان تولیدی و پارامترهای بویلر، کاهش قابلیت اطمینان واحد و واردشدن تنش‌های ترمودینامیکی به تجهیزات می‌گردد. در اين مقاله یک سیستم کنترل پیشنهادی بر مبنای کنترل مد لغزشی برای کنترل هماهنگ دو پارامتر اصلی بویلر- توربین، یعنی دور توربین (فرکانس) و فشار بخار سوپرهیت خروجی بویلر ارائه می‌گردد. در این راستا سعی می‌شود تا با مدل‌سازی دقیق و کامل سیستم از قبیل توربو ژنراتور، بویلر و سیستم‌های کنترلی آن، قابلیت روش پیشنهادی بهتر نمایان شود. این روش پیشنهادی بر روی نیروگاه بخاری اسلام‌آباد اصفهان شبیه‌سازی شده و با کنترل‌کننده‌های تناسبی انتگرالی به‌کار رفته در آن مقایسه شده است. نتایج شبیه‌سازی، قابلیت سیستم کنترل مد لغزشی را در کنترل فرکانس و فشار بخار سوپرهیت در حضور تغییرات بار و اغتشاشات بویلر به خوبی نشان می‌دهد.
In order to participate steam power plant in power system frequency regulating, in addition to producing the base load, the boiler and turbine should be controlled coordinately. Lack of coordinated control may lead to instability, cause oscillation in producing power and boiler parameters, and reducing the reliability and creating thermodynamic tension to devices. This paper proposes a sliding mode based controller to control two main boiler-turbine parameters; i.e., the turbine revolution and superheated steam pressure of the boiler output. For this purpose, complete and exact model of the subsystems including turbo-generator, turbine and related control systems are derived and the ability of the method is shown using this comprehensive model. The proposed method is simulated on the 320 MW unit of Islam-Abad power plant in Isfahan/Iran and its performance is compared with the related real PI controllers which have been used in this unit. The simulation results show the capability of the proposed controller system in controlling local network frequency and superheated steam pressure in the presence of load variations and disturbances.
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