کنترل اینورتر متصل به شبکه با قابلیت جبران‌سازی هارمونیک‌ها در چارچوب ساکن
محورهای موضوعی : مهندسی برق و کامپیوترمهدی شاه پرستی 1 , مصطفی محمدیان 2 , علی یزدیان ورجانی 3
1 - دانشگاه آزاد اسلامی واحد تهران شرق
2 - دانشگاه تربیت مدرس
3 - دانشگاه تربیت مدرس
کلید واژه: اينورتر متصل به شبکه جریان مرجع کنترل در چارچوب ساکن منبع تولید پراکنده,
چکیده مقاله :
به دلیل افزایش استفاده از منابع تولید پراکنده مبتنی بر اینورتر در سیستم‌های قدرت، ارتقای کیفیت توان این اینورترها ضروری می‌باشد. در این مقاله با ارائه یک طرح کنترلی جدید، اینورتر متصل به شبکه قادر خواهد شد در تمامی حالات شبکه قدرت اعم از حالت سینوسی، حالت هارمونیکی و حالت نامتعادل، جریان سینوسی را به آن تزریق کند. طرح کنترلی پیشنهادی از دو بخش 1) تعیین جریان مرجع سینوسی با توجه به شرایط ولتاژ شبکه و 2) كنترل‌كننده جریان برای ردیابی جریان مرجع تشکیل شده است. الگورتیم تعیین مرجع جریان پیشنهادی در مقایسه با سایر الگورتیم‌ها مانند روش تبدیل پارک ساده‌تر پیاده‌سازی می‌شود و دارای پاسخ دینامیکی سریع‌تری می‌باشد. كنترل‌كننده جریان پیشنهادی در چارچوب ساکن اجرا شده و نیاز به استفاده از تبدیل‌های پارک و كنترل‌كننده‌های متعدد برای جبران‌سازی هارمونیک‌ها در چارچوب سنکرون را حذف می‌نماید. همچنین این كنترل‌كننده تنها نیاز به یک متغیر کنترلی دارد، بنابراین در مقایسه با دیگر روش‌های کنترل با حجم محاسباتی کمتری پیاده‌سازی عملی می‌گردد. نتایج شبیه‌سازی برای تایید کارایی طرح کنترلی پیشنهادی ارائه شده است.
Due to increasing number of inverter based distributed generation resources in electric power systems, improving the quality and performance of them are necessary. In this paper a new current scheme is presented to inject sinusoidal current to the grid with following grid voltage conditions: sinusoidal voltage, distorted voltage and unbalance voltage. The proposed control scheme includes two sections: 1) Determination of sinusoidal reference current considering grid voltage condition; 2) current controller to track reference current. The proposed reference current determination algorithm in comparison with other algorithms, such as Park method is implemented easier and has faster dynamic response. The proposed current controller is implemented in the stationary reference frame and does not require the use of multiple controllers and coordinate transforms to compensate the harmonics. This control strategy needs tuning of only one variable, hence compared with other control methods requires less computational burden for practical implementation. Simulation results confirm the effectiveness of the proposed control method.
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