IJE TRANSACTIONS A: Basics Vol. 31, No. 4 (April 2018) 252-259    Article in Press

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M. Abbasi and B. Tousi
( Received: June 27, 2017 – Accepted: November 30, 2017 )

Abstract    In this paper, an additive self-tuning (ST) control scheme is presented for a static synchronous series compensator (SSSC) in order to improve performance of conventional PI control system in damping sub-synchronous resonance (SSR) oscillations. A three-level 24-pulse SSSC and fix capacitor provide the active and passive series compensation, respectively. This paper’s proposed ST controller consists of a pole shift (PS) controller and a recursive least squares (RLS). The RLS identifier algorithm is used to estimate parameters of auto regressive moving average exogenous (ARMAX) model which is used in this paper. With this scheme, there is no any necessity for retuning the PI controller parameters under different operational circumstances of the system. The analysis of SSR are performed using eigenvalue analysis, transient simulation and FFT analysis. As the results of this case study on a system adapted from IEEE First Benchmark Model show clearly, the proposed additive ST controller for damping of SSR under different disturbances and system’s operating conditions is effective and acceptable. It should be noted here that all digital simulations have been done using MATLAB.


Keywords    Static synchronous series compensator (SSSC), sub-synchronous resonance (SSR), self-tuning (ST), ARMAX, recursive least squares (RLS), pole shift (PS).


چکیده    دراین مقاله, یک کنترل کننده خود تنظیم برای یک جبران ساز سنکرون سری اساتیکی (SSSC) ارایه می گردد که هدف از آن بهبود عملکرد سیستم کنترل PI مرسوم در کاهش میراسازی نوسازات تشدید زیر سنکرون (SSR) می باشد. جبران سازی سری اکتیو و راکتیو به ترتیب توسط یک SSSC سه سطحه 24 پالس و یک خازن ثابت انجام می گیرد. طرح کنترلی پیشنهادی متشکل از یک کنترل کننده شیفت قطب (PS) و نیز حداقل مربعات بازگشتی (RLS) می باشد. الگوریتم شناسایی RLS برای تخمین پارامترهای مدل ARMAX مورد استفاده در این مطالعه به کار رفته است. بر اساس طرح پیشنهادی, نیازی برای تنظیم مجدد پارامترهای کنترل کننده PI تحت شرایط مختلف کاری سیستم وجود نخواهد داشت. تحلیل های SSR با استفاده از آنالیز مقادیر ویژه, شبیه سازی حالت گذرا و آنالیز FFT انجام گرفته اند. همانطور که نتایج این مطالعه بر روی مدل اول محک IEEE به وضوح نشان داده اند, کنترل کننده خود تنظیم پیشنهادی در جهت میراسازی نوسانات تشدید زیر سنکرون دارای عملکرد قابل قبول و موثری تحت اختلالات و شرایط کاری مختلف سیستم می باشد. لازم به ذکر است که تمام شبیه سازی ها توسط نرم افزار MATLAB انجام شده اند.

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