یک روش تطبیقی برای کاهش ولتاژ توالی منفی و جبران‌سازی عدم تعادل ولتاژ در ریزشبکه‌های جزیره‌ای
رضا غنی زاده
1
(
گروه برق، واحد ارومیه، دانشگاه آزاد اسلامی، ارومیه، ايران
)
الکلمات المفتاحية: ریزشبکه, منابع تولید پراکنده, عدم تعادل ولتاژ, ولتاژ توالی منفی, کنترل کننده مرکزی,
ملخص المقالة :
عدم تعادل ولتاژ در ریزشبکه‌ها باعث بروز مشکلاتی نظیر افزایش بیش از حد دما، کاهش بهره‌وری و کاهش عمر مفید تجهیزات و دستگاه‌های مصرف‌کنندگان می‌شود. در این مقاله، یک روش کنترلی نوین برای جبران‌سازی عدم تعادل ولتاژ در ریزشبکه‌های جزیره‌ای ارائه شده است. این روش با تخمین تطبیقی افت ولتاژ توالی منفی در امپدانس فیدر هر فاز، مرجع ولتاژ واحدهای تولید پراکنده (DG) را تنظیم کرده و با کاهش ولتاژ توالی منفی، جبران مؤثر عدم تعادل ولتاژ در ریزشبکه را امکان‌پذیر می‌سازد. برخلاف روش‌های پیشین، این رویکرد نیازمند کنترل‌کننده مرکزی اختصاصی نبوده و تنها به ارتباطات با پهنای باند پایین (LBC) بین DGهای همسایه نیاز دارد. علاوه بر این، این روش به اطلاعات دقیق مربوط به امپدانس فیدر خروجیDGها نیز نیازی ندارد. فرآیند تعیین و طراحی پارامترهای سیستم کنترل به‌طور کامل تشریح شده است و برای ارزیابی کارایی روش پیشنهادی، شبیه‌سازی بر روی یک سیستم نمونه با استفاده از نرم‌افزارMATLAB/Simulink انجام شده است. نتایج شبیه‌سازی نشان می‌دهد که این روش می‌تواند به‌عنوان یک راهکار مؤثر و کارآمد برای جبران‌سازی عدم تعادل ولتاژ در ریزشبکه‌های جزیره‌ای به کار گرفته شود.
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