Abstract




 
   

IJE TRANSACTIONS B: Applications Vol. 31, No. 11 (November 2018) 1852-1861    Article in Press

PDF URL: http://www.ije.ir/Vol31/No11/B/8-2940.pdf  
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  DELAY-SCHEDULED CONTROLLERS FOR INTER-AREA OSCILLATIONS CONSIDERING TIME DELAYS
 
R. Asghari, S. B. Mozafari and T. Amraee
 
( Received: June 02, 2018 – Accepted in Revised Form: August 17, 2018 )
 
 

Abstract    Unlike the existing views that was introduced the existence of delay caused by the transmission of wide area measurement system data (WAMS) into the controllers input of the power oscilation damping (POD) by communication networks as a reason for poor performance of the POD controllers. This paper shows that the presence of time delay in the feedback loop may improve the performance of a POD controller in reducing inter-area oscilations. In fact, in a situation where the design and implementation of a POD controller for an FACT device is not easy without delays, in order to compensate for the delay effectively. In this work, a delayed scheduling method to design POD controllers is proposed. At first modeling of power system with delay as a design parameter was established. Then, the power oscillation damping delay scheduling (PODDS) based on objective function of the spectral abscissa was designed and the sufficient condition about stability of the closed-loop system is given. To evaluate the accuracy of the proposed control function and feasibility study, a four-machine power system for numerical simulation was used. The simulation results show that the controller designed in a wide range of delay changes decreases the power system oscilations without restricting SVC performance.

 

Keywords    Delay Scheduling; Inter Area Oscilations; Maximum Convergence Rate; Time Delay System

 

چکیده   

بر خلاف دیدگاه‌های موجود که تأخیر ناشی از انتقال داده‌های سیستم اندازه‌گیری ابعاد وسیع (WAMS) را به ورودی کنترل‌کننده‌های میرایی نوسان توان (POD) توسط شبکه‌های ارتباطی به عنوان دلیلی برای عملکرد ضعیف کنترل‌کننده‌های PODمعرفی کرده‌اند، این مقاله نشان می‌دهد که حضور تاخیر زمانی در حلقه بازخورد می‌تواند عملکرد یک کنترل‌کننده POD را در کاهش نوسانات بین ناحیه‌ای بهبود دهد. در حقیقت، در شرایطی که طراحی و پیاده‌سازی یک کنترل‌کننده POD برای دستگاه FACT بدون تاخیر آسان نیست، به منظور جبران‌سازی تاخیر به طور موثر، این مقاله یک روش برنامه‌ریزی تاخیری را برای طراحی کنترل‌کننده‌های POD پیشنهاد داده است. ابتدا مدلسازی سیستم قدرت با تاخیر به عنوان پارامتر طراحی صورت گرفته است. سپس، برنام‌ریزی تاخیری برای طراحی میراساز نوسان توان (PODDS) بر اساس تابع هدف ابعاد طیفی و شرایط کافی در مورد پایداری سیستم حلقه بسته ارائه شده است. امکان‌سنجی کنترل‌کننده پیشنهادی با شبیه‌سازی‌های عددی بر روی سیستم قدرت چهار ماشینه تایید شده است. نتایج شبیه‌سازی نشان می‌دهد که کنترل‌کننده طراحی‌شده نوسانات سیستم قدرت را در طیف گسترده‌ای از تغییرات تاخیر بدون محدود کردن عملکرد SVC میرا کند.

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