طراحي کنترلکننده يکپارچه توان بهصورت دوخطي جهت بهبود پايداري شبکه
محورهای موضوعی : مهندسی برق و کامپیوترمجید نیریپور 1 * , علی یزدیان ورجانی 2 , مصطفی محمدیان 3
1 - دانشگاه صنعتی شیراز
2 - دانشگاه تربیت مدرس
3 - دانشگاه تربیت مدرس
کلید واژه: کنترلکننده يکپارچه توانمبدل موازيمبدل سري,
چکیده مقاله :
در اين مقاله مدل کنترلکننده يکپارچه توان (UPFC) با استفاده از فرم اصلاحشده معادلات دوخطي بيان شده است. سپس با استفاده از روش دوم لياپانوف و با در نظر گرفتن تابع انرژي وروديها طوری بهدست آورده شده که تحت شرايط معيني مشتق تابع انرژي همواره نزولي باشد. در نهايت کنترلکننده به دو روش طراحي ميشود. در روش اول تغييرات متغيرهاي حالت بهعنوان ورودي کنترلکننده جهت بهدست آوردن سيگنالهاي مدولهکننده به مبدلهاي موازي و سري در نقطه کار اضافه ميشوند. در روش دوم، متغيرهاي حالت غير خطي به کنترلکننده مبدل سري اعمال و از کنترلکننده PI در مبدل موازي استفاده ميشود. مقايسه اين دو نوع کنترلکننده با کنترلکننده PI بيانگر کاهش دامنه نوسان اول پس از رفع اغتشاشات بزرگ ميباشد. سادگي کنترلکننده و طراحي کنترلکنندههای خطي مبدل موازي و سري بهطور همزمان از مزيتهاي استفاده از اين روش کنترلي نسبت به کنترلکنندههای PI ميباشد.
In this paper the model of UPFC is represented by a bilinear equation. Then with the second method of Lyapunov, the input of converter is derived such that the derivative of energy function is negative. The design of controller is carried out with two methods. In the first method, the controller is linearized at operating point. In the second method, the nonlinear method is used in the series converter and the PI controller is used in the shunt converter. Reduction of first swing peak after fault clearing is the main advantage of designed controller with respect of PI controller.
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