متعادل‌سازی ولتاژ نقطه اتصال مشترک منبع تولید پراکنده با استفاده از قاب مرجع سنکرون دوگانه مجزا

شناسنامه علمی شماره

نویسندگان

گروه برق - دانشکده فنی و مهندسی- دانشگاه رازی

چکیده

نامتعادلی ولتاژ باعث کاهش کیفیت توان الکتریکی و بروز مشکلاتی در تجهیزات مشترکین و در بهره­برداری از شبکه­ها به­ویژه شبکه­های دارای منابع تولید پراکنده (DG) می­شود. استفاده از منابع تولید پراکنده کنترل­شونده توسط اینورتر در ریزشبکه­ها، این امکان را به وجود آورده­است تا نامتعادلی ولتاژ توسط واحدهای تولید پراکنده جبران شود. برای جبران­سازی نامتعادلی ولتاژ، معمولاً از دو حلقه کنترلی برای کنترل مولفه­های مثبت و منفی در قاب چرخان dq استفاده می­شود. با این وجود، حلقه­های کنترلی توالی مثبت و منفی به­طور کامل از یک­دیگر مجزا نبوده و یک کوپل نوسانی بین آن­ها وجود دارد. در این مقاله، استفاده از قاب مرجع سنکرون دوگانه مجزا برای حذف کوپل نوسانی و جبران­سازی نامتعادلی ولتاژ پیشنهاد شده­است. نتایج شبیه­سازی نشان می­دهد، با استفاده از روش کنترلی پیشنهادی، نامتعادلی ولتاژ در نقطه اتصال مشترک به­طور موثری کاهش می­یابد. همچنین، به­دلیل مجزا­شدن حلقه کنترلی توالی مثبت از حلقه کنترلی توالی منفی، عمل­کرد واحد تولید پراکنده در تزریق توان به شبکه، تحت­تاثیر سیستم کنترل نامتعادلی ولتاژ پیشنهادی قرار نمی­گیرد.

کلیدواژه‌ها

عنوان مقاله [English]

Voltage Balancing at the Point of Common Coupling of DG Unit Using Decoupled Double Synchronous Reference Frame

نویسندگان [English]

  • P. Sharafi
  • Sh. Karimi
Department of Electrical Engineering, Razi University, Kermanshah, Iran
چکیده [English]

Voltage unbalance reduces the power quality and causes problems in the customer equipment and in the grids operation, especially in grids including distributed generation sources. In microgrids, use of distributed generation sources controlled by the inverter, has made it possible to compensate voltage unbalance by distributed generation units. To compensate voltage unbalance, usually two control loops are used to control the positive and negative components in the dq rotary frame. Nevertheless, the control loops of the positive and negative sequences are not completely decoupled from each other and there is an oscillatory coupling between them. In this paper, the use of the decoupled double synchronous reference frame in order to eliminate oscillating couplings and for voltage unbalance compensation is proposed. The simulation results show that, using the proposed control method, the voltage unbalance at the point of common coupling is effectively reduced. Also, due to the decoupling of the positive sequence from the negative sequence control loop, the performance of the distributed generation unit in the power injection to the grid is not affected by the voltage unbalance control system.

کلیدواژه‌ها [English]

  • Voltage unbalance compensation
  • microgrid
  • decoupled double synchronous reference frame
  • droop control
  • current controller

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