کنترل و حفاظت اینورتر خورشیدی متصل به شبکه مجهز به کنترل دروپ با قابلیت گذر از ولتاژ کم

نوع مقاله : علمی-پژوهشی

نویسنده

استادیار، دانشکده فنی و مهندسی، دانشگاه ملایر، ملایر، ایران

چکیده

در این مقاله طرح کنترلی جدیدی جهت حفاظت اینورتر خورشیدی دو طبقه ای متصل به شبکه با قابلیت گذر از ولتاژ کم متعادل پیشنهاد می شود. در طرح پیشنهادی، تزریق توان به شبکه با کنترل ولتاژ/فرکانس تولیدی اینورتر تنظیم می گردد. در شرایط خطای افت ولتاژ در شبکه، اینورتر خورشیدی توانایی تزریق توان راکتیو به شبکه را متناسب با میزان افت ولتاژ دارد و مرجع اندازه ولتاژ خروجی اینورتر توسط کنترل دروپ تعیین می شود. جهت محدود کردن جریان خروجی اینورتر در شرایط افت ولتاژ شبکه، با هدف حفظ پایداری، مشخصه افتی ولتاژ شناور اصلاح شده پیشنهاد شده است. در طرح پیشنهادی یک الگوریتم ردیابی توان یکپارچه جدید نیز ارائه شده است که علاوه بر ردیابی حداکثر توان در شرایط عادی، در شرایط افت ولتاژ در صورت عدم وجود ظرفیت خالی در اینورتر برای تزریق توان راکتیو، توان دریافتی از سلول های خورشیدی را چنان کاهش داااده می شود که اینورتر در برابر افزایش جریان بیش از حد محافظت شود. کارایی روش پیشنهادی به کمک شبیه سازی در نرم افزار MATLAB/SIMULINK و پیاده سازی به شیوه پردازنده در حلقه نشان داده می‌شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Control and Protection of The Droop-Controlled Grid-Connected Solar Inverter with The Ability of Low Voltage Ride-Through

نویسنده [English]

  • Abdolhossein Saleh
Electrical Engineering Department, Malayer University, Malayer, Iran
چکیده [English]

In this paper a new control scheme is proposed to protect the two-stage grid-connected solar inverter with ability of balanced Low Voltage Ride-Through (LVRT). In the proposed scheme, the power injection to the grid is regulated by controlling the voltage/frequency produced by the inverter. In the grid voltage drop condition , the solar inverter has the ability to inject reactive power into the grid in proportion to the voltage drop magnitude, and the inverter output voltage reference is determined by the droop control. To limit the inverter output current in the grid voltage drop condition, with the aim of maintaining the stability, an modified floating voltage drop characteristic has been proposed. Also, in the proposed scheme, a new integrated power tracking algorithm is presented, which in addition to tracking the maximum power in normal conditions, in the drop voltage conditions, if there is no empty capacity in the inverter to inject reactive power, it reduces the received power from the solar cells to allows the inverter to be protected against excessive current increase. The efficiency of the proposed method is shown by the time domain simulation in the MATLAB/SIMULINK environment and implementation in the way of processor in the loop

کلیدواژه‌ها [English]

  • Grid-connected solar inverter
  • droop control
  • overcurrent protection
  • integrated power tracking algorithm
  • balanced low voltage ride through

مراجع

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